58SC0B-01SI Single Stage Multi Speed

Product Information

Specifications

• Model Nomenclature: A220926
• Unit Sizes:
  • 045M14–12
  • 045M17–14
  • 070M14–12
  • 070M17–12
  • 070M17–16
  • 070M21–16
  • 090M17–14
  • 090M21–16
  • 090M21–20
  • 110M21–20
  • 110M24–20
  • 135M24–20
• A Cabinet Width: 14-3/16 (360) – 135M24–20
• B Outlet Width: 12-9/16 (319) – 135M24–20
• C Top and Bottom Flue Collar: 9-5/16 (237) – 135M24–20

Product Usage Instructions

Installation

To install the product, please follow these steps:

1. Read the entire instruction manual before starting the
   installation process.

2. Refer to the model nomenclature (A220926) for specific
   information about the unit size.

3. Ensure proper filter arrangement (see “Filter Arrangement”
   section) and air ducts (see “Air Ducts” section).

4. Install gas piping following the guidelines provided in the
   manual (see “Gas Piping” section).

5. Make electrical connections as per the instructions (see
   “Electrical Connections” section).

6. Vent the product according to the venting instructions (see
   “Venting” section).

Filter Arrangement

The product requires a specific filter arrangement for optimal
performance. Please refer to the manual for detailed instructions
on how to arrange the filters.

Air Ducts

Proper air ducts are essential for efficient operation. Follow
the instructions in the manual to ensure correct installation and
configuration of the air ducts.

Gas Piping

When installing the gas piping, follow the guidelines provided
in the manual to ensure safe and proper installation.

Electrical Connections

Make electrical connections following the instructions provided
in the manual. Ensure all connections are secure and in accordance
with local electrical codes.

Venting

Vent the product according to the instructions provided in the
manual. Proper venting is crucial for safe and efficient
operation.

FAQ

Q: What should I do if I detect a gas leak?

A: If you detect a gas leak, immediately evacuate the area and
contact your local gas utility provider or emergency services. Do
not attempt to fix the leak yourself.

Q: How often should I replace the filters?

A: The frequency of filter replacement depends on usage and
environmental conditions. It is recommended to check and replace
filters regularly, at least every 3 months or as specified in the
manual.

58SC0B/58SC1B 80% AFUE, Single Stage, Multi-Speed ECM, 4-Way Multipoise, Non­Condensing Gas Furnace

Installation, Start­Up, Operating and

Service and Maintenance Instructions

NOTE: Read the entire instruction manual before starting the PARTS REPLACEMENT INFORMATION GUIDE . . . . . . . . . . . 46

installation.

MODEL NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

TABLE OF CONTENTS

TRAINING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 1 ­ Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 AIR FOR COMBUSTION AND VENTILATION . . . . . . . . . . . . . . 7

To learn more about this appliance and installation via a mobile device, go to https://carrier.hvacpartners.com/NFC or use the QR code below. To access airflow tables or troubleshooting guide on your mobile device go to mlctraining.com/training/techdocs/25/ or use the QR code below.

Table 2 ­ Minimum Free Area Required for Each Combustion Air

Opening or Duct to Outdoors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3 ­ Minimum Space Volumes for 100% Combustion, Ventila-

tion, and Dilution from Indoors . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 4 ­ Opening Dimensions – In. (mm) . . . . . . . . . . . . . . . . . 11

FILTER ARRANGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

AIR DUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

A220926

GAS PIPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 5 ­ Maximum Capacity of Pipe* . . . . . . . . . . . . . . . . . . . . 14

ELECTRICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 6 ­ Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 7 ­ Combined Appliance Maximum Input Rating in Thousands of BTUh per Hour . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 8 ­ Minimum Allowable Input Rating of Space-Heating Appliance in Thousands of BTUh per Hour . . . . . . . . . . . . . . . . . . . . . 20

A200103
! WARNING

AIR DELIVERY – CFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

CARBON MONOXIDE POISONING HAZARD

Table 9 ­ Air Delivery – CFM (with filter)* . . . . . . . . . . . . . . . . 24 Table 10 ­ Airflow Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 FURNACE CONTROL PROGRAMMING AND NAVIGATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Table 11 ­ System Status Display Codes. . . . . . . . . . . . . . . . . . . 28 Table 12 ­ Main Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . 29 SERVICE LABEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Failure to follow this warning could result in personal injury and/or death.
Carbon Monoxide (CO) is a colorless, odorless, and tasteless poisonous gas that can be fatal when inhaled. Follow all installation, maintenance, and service instructions. See additional information below regarding the installation of a CO Alarm.

START-UP, ADJUSTMENT, AND SAFETY CHECK . . . . . . . . . 31 Table 13 ­ Test Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Table 14 ­ Altitude Derate Multiplier for U.S.A. . . . . . . . . . . . . 32 Table 15 ­ Gas Rate (Cu Ft./Hr.) . . . . . . . . . . . . . . . . . . . . . . . . . 33 Table 16 ­ Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Table 17 ­ Orifice Size And Manifold Pressure (in. w.c.) for Gas Input Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
SERVICE AND MAINTENANCE PROCEDURES. . . . . . . . . . . . 36 CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 18 ­ Filter Size Information (In. / mm) . . . . . . . . . . . . . . . 37 SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Most states in the USA and jurisdictions in Canada have laws that require the use of Carbon Monoxide (CO) alarms with fuel burning products. Examples of fuel burning products are furnaces, boilers, space heaters, generators, water heaters, stoves/ranges, clothes dryers, fireplaces, incinerators, automobiles, and other internal combustion engines. Even if there are no laws in your jurisdiction requiring a CO Alarm, it’s highly recommended that whenever any fuel burning product is used in or around the home or business that the dwelling be equipped with a CO Alarm(s). The Consumer Product Safety Commission recommends the use of CO Alarm(s). The CO Alarm(s) must be installed, operated, and maintained according to the CO Alarm manufacturer’s instructions. For more information about Carbon Monoxide, local laws, or to purchase a CO Alarm online, please visit the following website. https://www.kidde.com.

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Portions of the text and tables are reprinted from current edition of NFPA 54/ANSI Z223.1E, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSI on the referenced subject, which is represented only by the standard in its entirety.

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

NOTE: ALL DIMENSIONS IN INCH (MM)

U.S. ECCN: Not Subject to Regulation (N.S.R.)

Fig. 1 ­ Dimensional Drawing

SD5669-4 REV. –

A210785

Unit Size
045M14–12 045M17–14 070M14–12 070M17–12 070M17–16 070M21–16 090M17–14 090M21–16 090M21–20 110M21–20 110M24–20 135M24–20

A CABINET WIDTH
14-3/16 (360) 17-1/2 (445) 14-3/16 (360) 17-1/2 (445) 17-1/2 (445)
21 (533) 17-1/2 (445)
21 (533) 21 (533) 21 (533) 24-1/2 (622) 24-1/2 (622)

Table 1 ­ Dimensions

B OUTLET WIDTH
12-9/16 (319) 15-7/8 (403) 12-9/16 (319) 15-7/8 (403) 15-7/8 (403) 19-3/8 (492) 15-7/8 (403) 19-3/8 (492) 19-3/8 (492) 19-3/8 (492) 22-7/8 (581)

C TOP AND BOTTOM FLUE COLLAR 9-5/16 (237) 11-9/16 (294) 9-5/16 (237) 11-9/16 (294) 11-9/16 (294) 13-5/16 (338) 11-9/16 (294) 13-5/16 (338) 13-5/16 (338) 13-5/16 (338) 15-1/16 (383)

22-7/8 (581)

15-1/16 (383)

D BOTTOM INLET WIDTH
12-11/16 (322) 16 (406)
12-11/16 (322) 16 (406) 16 (406)
19-1/2 (495) 16 (406)
19-1/2 (495) 19-1/2 (495) 19-1/2 (495)
23 (584) 23 (584)

VENT CONNECTION
SIZE
4 (102) 4 (102) 4 (102) 4 (102) 4 (102) 4 (102) 4 (102) 4 (102) 4 (102) 4 (102) 4 (102) 4 (102)*

SHIP WT. LB. (KG)
108 (49) 121 (55) 114 (52) 124 (56) 127 (58) 139.5 (63) 133 (60) 140.5 (64) 147 (67) 150 (68) 165 (75) 167 (76)

*. 135 size furnaces requires a 5 or 6-in. (127 or 152 mm) vent. Use a vent adapter between furnace and vent stack. See Installation Instructions for complete installation requirements

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 2

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

SAFETY CONSIDERATIONS
! WARNING
FIRE, INJURY, OR DEATH HAZARD Failure to follow this warning could result in property damage, personal injury, or death. This furnace was manufactured to operate with natural gas. When fuel supply is Liquid Propane (LP), this furnace must be converted with a factory approved LP conversion kit. See furnace rating plate for approved conversion kit.

! WARNING
FIRE, INJURY, OR DEATH HAZARD Failure to follow this warning could result in property damage, personal injury, or death. Do not bypass any of the safety controls in the furnace, including but not limited to the main limit switch, rollout or burner thermal switch, and pressure switch/pressure transducer.
! WARNING

! WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK, AND CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in dangerous operation, serious injury, death, or property damage. Improper installation, adjustment, alteration, service, maintenance, or use could cause carbon monoxide poisoning, explosion, fire, electrical shock, or other conditions which may cause personal injury or property damage. Consult a qualified service agency, local gas supplier, or your distributor or branch for information or assistance. The qualified service agency must use only factory-authorized accessories and replacement parts when installing and servicing this product.
! WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK, AND CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in dangerous operation, personal injury, death, or property damage. Furnaces shall NOT be twinned (i.e. tandem or staged operation) unless approved in factory technical specifications literature for the furnace. A factory authorized, field-supplied Twinning Kit MUST be used. Consult furnace pre-sale literature for specific models approved for twinning and the correct twinning kit. Twinned furnaces must be installed on both a common supply AND a common return duct system as shown in the Twinning Kit Installation Instructions. Only two furnaces can be twinned on a common supply and return duct system using a factory authorized twinning kit.
! CAUTION
FURNACE RELIABILITY HAZARD Improper installation or misapplication of furnace may require excessive servicing or cause premature component failure. Application of this furnace should be indoors with special attention given to vent sizing and material, gas input rate, air temperature rise, unit leveling, and unit sizing.

PERSONAL INJURY AND PROPERTY DAMAGE HAZARD Failure to follow this warning could result in property damage, personal injury, or death. For continued performance, reliability, and safety, the only approved accessories and replacement parts are those specified by the equipment manufacturer. The use of non-manufacturer approved parts and accessories could invalidate the equipment limited warranty and result in fire risk, equipment malfunction, and failure. Please review manufacturer’s instructions and replacement part catalogs available from your equipment supplier
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions include in literature and attached to the unit. Consult local building codes, the current editions of the current edition of National Fuel Gas Code (NFGC) NFPA 54/ANSI Z223.1 and the current edition of National Electrical Code (NEC) NFPA 70.
Recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
! CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing furnaces.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 3

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

The following additional safety considerations should be followed for gas furnaces:
1. Use only with type of gas approved for this furnace. Refer to the furnace rating plate.
2. Install this furnace only in a location and position as specified in the “Location” section of these instructions.
3. Provide adequate combustion and ventilation air to the furnace space as specified in “Air for Combustion and Ventilation” section.
4. Combustion products must be discharged outdoors. Connect this furnace to an approved vent system only, as specified in the “Venting” section of these instructions.
5. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections, as specified in the “Gas Piping” section.
6. Always install furnace to operate within the furnace’s intended temperature-rise range with a duct system which has an external static pressure within the allowable range, as specified in the “Start-Up, Adjustments, and Safety Check” section. See furnace rating plate.
7. When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by duct(s) sealed to the furnace casing and terminating outside the space containing the furnace. See “Air Ducts” section.
8. A gas-fired furnace for installation in a residential garage must be installed as specified in the warning box in the “Location” section.
9. The furnace may be used for construction heat provided that the furnace installation and operation complies with the first CAUTION in the LOCATION section of these instructions.
10. These Multipoise Gas-Fired Furnaces are CSA (formerly A.G.A. and C.G.A). design-certified for use with natural and propane gases (see furnace rating plate) and for installation in alcoves, attics, basements, closets, utility rooms, crawlspaces, and garages. The furnace is factory-shipped for use with natural gas. A CSA listed accessory gas conversion kit is required to convert furnace for use with propane gas.
11. See Fig. 2 for required clearances to combustible construction.
12. Maintain a 1-in. (25 mm) clearance from combustible materials to supply air ductwork for a distance of 36 inches (914 mm) horizontally from the furnace. See current edition of NFPA 90B or local code for further requirements.
13. These furnaces SHALL NOT be installed directly on carpeting, tile, or any other combustible material other than wood flooring. In downflow installations, factory accessory floor base MUST be used when installed on combustible materials and wood flooring. Special base is not required when this furnace is installed on manufacturer’s cased evaporator coils or when manufacturer’s evaporator coil casing is used. See Fig. 2 for clearance to combustible construction information.

INTRODUCTION

Fig. 2 ­ Clearances to Combustibles

A220231

Fig. 3 ­ Multipoise Orientations

A02097

This 4-way multipoise Category I fan-assisted furnace is CSA design-certified. A Category I fan-assisted furnace is an appliance equipped with an integral mechanical means to either draw or force products of combustion through the combustion chamber and/or heat exchanger. The furnace is factory-shipped for use with natural gas.

This furnace is not approved for installation in mobile homes, recreational vehicles, or outdoors. This furnace is designed for minimum continuous return- air temperature of 60°F (16°C) db or intermittent operation down to 55°F (13°C) db such as when used with a night setback thermostat. Return-air temperature must not exceed 80°F (27°C) db. Failure to follow these return-air temperature limits may affect reliability of heat exchangers, motors, and controls (see Fig. 4).

For accessory installation details, refer to the applicable instruction literature.

NOTE: Remove all shipping brackets and materials before operating the furnace.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 4

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Fig. 4 ­ Return Air Temperature

A221115

! WARNING

FIRE HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
Do not install the furnace on its back or hang furnace with control compartment facing downward. Safety control operation will be adversely affected. Never connect return-air ducts to the back of the furnace (see Fig. 5).

Fig. 5 ­ Prohibit Installation on Back

A02054

! WARNING

FIRE HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage.
When the furnace is installed in a residential garage, the burners and ignition sources must be located at least 18 inches above the floor. The furnace must be located or protected to avoid damage by vehicles. When the furnace is installed in a public garage, airplane hangar, or other building having a hazardous atmosphere, the furnace must be installed in accordance with the NFGC (see Fig. 6).

CODES AND STANDARDS
Follow all national and local codes and standards in addition to these instructions. The installation must comply with regulations of the serving gas supplier, local building, heating, plumbing, and other codes. In absence of local codes, the installation must comply with the national codes listed below and all authorities having jurisdiction.
In the United States, follow all codes and standards for the following:
Safety · USA: Current edition of National Fuel Gas Code (NFGC) NFPA
54/ANSI Z223.1 and the Installation Standards, Warm Air Heating and Air Conditioning Systems ANSI/NFPA 90B.
General Installation · Current edition of the NFGC and the NFPA 90B. For copies, contact
the National Fire Protection Association Inc., Batterymarch Park, Quincy, MA 02269; (www.NFPA.org) or for only the NFGC, contact the American Gas Association, 400 N. Capitol Street, N.W., Washington, DC 20001 (www.AGA.org).
Combustion and Ventilation Air · Current edition of NFGC NFPA54/ANSI Z223.1 Section 9.3, Air for
Combustion and Ventilation.
Duct Systems · Air Conditioning Contractors Association (ACCA) Manual D, Sheet
Metal and Air Conditioning Contractors National Association (SMACNA), or American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) 2005 Fundamentals Handbook Chapter 35 or 2004 HVAC Systems and Equipment Handbook Chapters 9 and 16.
Acoustical Lining and Fibrous Glass Duct · Current edition of SMACNA and NFPA 90B as tested by UL Standard
181 for Class I Rigid Air Ducts.
Gas Piping and Gas Pipe Pressure Testing · Current edition of NFGC NFPA54/ANSI Z223.1; chapters 5, 6, 7, and
8 and National Plumbing Codes.
Electrical Connections · Current edition of National Electrical Code (NEC) NFPA 70.
Venting · Current edition of NFGC NFPA 54 / ANSI Z223.1; Chapters 12 and
13.
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE
1. Disconnect all power to the furnace. Multiple disconnects maybe required. DO NOT TOUCH THE CONTROL OR ANY WIRE CONNECTED TO THE CONTROL PRIOR TO DISCHARGING YOUR BODY’S ELECTROSTATIC CHARGE TO GROUND.

! CAUTION

Fig. 6 ­ Installation in a Garage

A93044

FURNACE RELIABILITY HAZARD Improper installation or service of furnace may cause premature furnace component failure.
Electrostatic discharge can affect electronic components. Follow the Electrostatic Discharge Precautions Procedure listed below during furnace installation and servicing to protect the furnace electronic control. Precautions will prevent electrostatic discharges from personnel and hand tools which are held during the procedure. These precautions will help to avoid exposing the control to electrostatic discharge by putting the furnace, the control, and the person at the same electrostatic potential.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 5

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

2. Firmly touch the clean, unpainted, metal surface of the furnace chassis which is close to the control. Firmly touch the clean, unpainted, metal surface of the furnace chassis which is close to the control. Tools held in a person’s hand during grounding will be satisfactorily discharged.
3. After touching the chassis, you may proceed to service the control or connecting wires as long as you do nothing to recharge your body with static electricity (for example; DO NOT move or shuffle your feet, do not touch ungrounded objects, etc.).
4. If you touch ungrounded objects (and recharge your body with static electricity), firmly touch a clean, unpainted metal surface of the furnace again before touching control or wires.
5. Use this procedure for installed and uninstalled (ungrounded) furnaces.
6. Before removing a new control from its container, discharge your body’s electrostatic charge to ground to protect the control from damage. If the control is to be installed in a furnace, follow items 1 through 4 before bringing the control or yourself in contact with the furnace. Put all used and new controls into containers before touching ungrounded objects.
7. An ESD service kit (available from commercial sources) may also be used to prevent ESD damage.
LOCATION GENERAL
This multipoise furnace is shipped in packaged configuration. Some assembly and modifications are required when used in any of the four applications (see Fig. 3).
This furnace must: · be installed so the electrical components are protected from water. · not be installed directly on any combustible material other than wood
flooring for upflow applications. Downflow installations require use of a factory-approved floor base or coil assembly when installed on combustible materials or wood flooring (refer to SAFETY CONSIDERATIONS). · be located as close to the chimney or vent and attached to an air distribution system. Refer to Air Ducts section. · be provided ample space for servicing and cleaning. Always comply with minimum fire protection clearances shown on the furnace clearance to combustible label.
The following types of furnace installations may require OUTDOOR AIR for combustion due to chemical exposures: · Commercial buildings · Buildings with indoor pools · Laundry rooms · Hobby or craft rooms, and · Chemical storage areas
If air is exposed to the following substances, it should not be used for combustion air, and outdoor air may be required for combustion: · Permanent wave solutions · Chlorinated waxes and cleaners · Chlorine based swimming pool chemicals · Water softening chemicals · De-icing salts or chemicals · Carbon tetrachloride · Halogen type refrigerants · Cleaning solvents (such as perchloroethylene) · Printing inks, paint removers, varnishes, etc. · Hydrochloric acid · Cements and glues · Antistatic fabric softeners for clothes dryers

· Masonry acid washing materials
All fuel-burning equipment must be supplied with air for fuel combustion. Sufficient air must be provided to avoid negative pressure in the equipment room or space. A positive seal must be made between the furnace cabinet and the return-air duct to prevent pulling air from the burner area and from draft safeguard opening.
LOCATION RELATIVE TO COOLING EQUIPMENT
The cooling coil must be installed parallel with, or on the downstream side of the unit to avoid condensation in the heat exchangers. When installed parallel with the furnace, dampers or other flow control must prevent chilled air from entering the furnace. If the dampers are manually operated, they must be equipped with means to prevent operation of either unit unless the damper is in the full-heat or full-cool position.
! CAUTION
PERSONAL INJURY AND/OR PROPERTY DAMAGE HAZARD Improper use or installation of this furnace may cause premature furnace component failure.
This gas furnace may be used for heating buildings under construction provided that:
– The furnace is permanently installed with all electrical wiring, piping, venting and ducting installed according to these installation instructions. A return air duct is provided, sealed to the furnace casing, and terminated outside the space containing the furnace. This prevents a negative pressure condition as created by the circulating air blower, causing a flame rollout and/or drawing combustion products into the structure.
– The furnace is controlled by a thermostat. It may not be “hot wired” to provide heat continuously to the structure without thermostatic control.
– Clean outside air is provided for combustion. This is to minimize the corrosive effects of adhesives, sealers and other construction materials. It also prevents the entrainment of drywall dust into combustion air, which can cause fouling and plugging of furnace components.
– The temperature of the return air to the furnace is maintained between 55°F (13°C) and 80°F (27°C), with no evening setback or shutdown. The use of the furnace while the structure is under construction is deemed to be intermittent operation per our installation instructions.
– The air temperature rise is within the rated rise range on the furnace rating plate, and the gas input rate has been set to the nameplate value.
– The filters used to clean the circulating air during the construction process must be either changed or thoroughly cleaned prior to occupancy.
– The furnace, ductwork and filters are cleaned as necessary to remove drywall dust and construction debris from all HVAC system components after construction is completed.
– Verify proper furnace operating conditions including ignition, gas input rate, air temperature rise, and venting according to these installation instructions.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 6

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

! WARNING
CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in personal injury or death, and unit component damage. Corrosive or contaminated air may cause failure of parts containing flue gas, which could leak into the living space. Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride, bromide, and iodide. These elements can corrode heat exchangers and shorten furnace life. Air contaminants are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air fresheners, and other household products. Do not install furnace in a corrosive or contaminated atmosphere. Make sure all combustion and circulating air requirements are met, in addition to all local codes and ordinances.
! CAUTION

2. Fig. 7 illustrates how to provide TWO OUTDOOR OPENINGS, one inlet and one outlet combustion and ventilation air opening, to the outdoors. a. One opening MUST commence within 12-in. (300 mm) of the ceiling and the second opening MUST commence within 12-in. (300 mm) of the floor. b. Size openings and ducts per Fig. 7 and Table 2. c. TWO HORIZONTAL DUCTS require 1 square inch of free area per 2,000 BTUh (1,100 mm2/kW) of combined input for all gas appliances in the space per Fig. 7 and Table 2. d. TWO OPENINGS OR VERTICAL DUCTS require 1 square inch of free area per 4,000 BTUh (550 mm2/kW) for combined input of all gas appliances in the space per Fig. 7 and Table 2.
3. ONE OUTDOOR OPENING requires: a. 1 square inch of free area per 3,000 BTUh (734 mm2/kW) for combined input of all gas appliances in the space per Table 2 and b. Not less than the sum of the areas of all vent connectors in the space.

FURNACE CORROSION HAZARD Failure to follow this caution may result in furnace damage. Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride, bromide, and iodide. These elements can corrode heat exchangers and shorten furnace life. Air contaminants are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air fresheners, and other household products.

AIR FOR COMBUSTION AND VENTILATION
Provisions for adequate combustion, ventilation, and dilution air must be provided in accordance with:
· U.S. installations: Section 9.3 of the current edition of NFGC NFPA54/ANSI Z223.1, Air for Combustion and Ventilation, and applicable provisions of the local building codes.

! WARNING
CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in personal injury or death. The operation of exhaust fans, kitchen ventilation fans, clothes dryers, attic exhaust fans or fireplaces could create a NEGATIVE PRESSURE CONDITION at the furnace. Make-up air MUST be provided for the ventilation devices, in addition to that required by the furnace. Refer to Carbon Monoxide Poisoning Hazard warning in venting section of these instructions to determine if an adequate amount of make-up air is available.

• Minimum dimensions of 3 in. (76 mm).

A03174

NOTE: Use any of the following combinations of openings: A&B, C&D, D&E, F&G

Fig. 7 ­ Air for Combustion, Ventilation, and Dilution for Outdoors

The requirements for combustion and ventilation air depend upon whether or not the furnace is located in a space having a volume of at least 50 cubic feet per 1,000 BTUh input rating for all gas appliances installed in the space.
· Spaces having less than 50 cubic feet per 1,000 BTUh require the OUTDOOR COMBUSTION AIR METHOD.
· Spaces having at least 50 cubic feet per 1,000 BTUh may use the INDOOR COMBUSTION AIR, STANDARD or KNOWN AIR INFILTRATION METHOD.
Outdoor Combustion Air Method
1. Provide the space with sufficient air for proper combustion, ventilation, and dilution of flue gases using permanent horizontal or vertical duct(s) or opening(s) directly communicating with the outdoors or spaces that freely communicate with the outdoors.

• Minimum opening size is 100 in.2 with minimum dimensions

A03175

of 3 in. (76 mm).

• Minimum of 3 in. (76 mm), when type -B1 vent is used.

Fig. 8 ­ Air for Combustion, Ventilation, and Dilution from Indoors

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 7

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

The opening shall commence within 12″ (300 mm) of the ceiling. Appliances in the space shall have clearances of at least 1″ (25 mm) from the sides and back and 6″ (150 mm) from the front. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.
Indoor Combustion Air – NFPA & AGA
Standard and Known-Air-Infiltration Rate Methods
Indoor air is permitted for combustion, ventilation, and dilution, if the Standard or Known-Air-Infiltration Method is used.

! WARNING
CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in death and/or personal injury. Many homes require air to be supplied from outdoors for furnace combustion, ventilation, and dilution of flue gases. The furnace combustion air supply must be provided in accordance with this instruction manual.

FURNACE INPUT (BTUH)
44,000 66,000 88,000 110,000 132,000 154,000

Table 2 ­ Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors

TWO HORIZONTAL DUCTS (1 SQ. IN./2,000 BTUH) (1,100 SQ. MM/KW)

SINGLE DUCT OR OPENING (1 SQ. IN./3,000 BTUH) (734 SQ. MM/KW)

TWO OPENINGS OR VERTICAL DUCTS (1 SQ. IN./4,000 BTUH) (550 SQ. MM/KW)

Free Area of Opening and Duct (sq. in. / sq. mm)
22 (14193) 33 (21290) 44 (28387) 55 (35484) 66 (42581) 77 (49677)

Round Duct Diameter (in./mm) 6 (152) 7 (178) 8 (203) 9 (229) 10 (254) 10 (254)

Free Area of Opening and Duct (sq. In. / sq. mm)
14.7 (9484) 22 (14193) 29.3 (18903) 36.7 (23677) 44 (28387) 51.3 (33096)

Round Duct Diameter (in. / mm) 5 (127) 6 (152) 7 (178) 7 (178) 8 (203) 9 (229)

Free Area of Opening and Duct (sq. In. / sq. mm)
11 (7097) 16.5 (10645) 22 (14193) 27.5 (17742) 33 (21290) 38.5 (24839)

Round Duct Diameter (In./mm) 4 (102) 5 (127) 6 (152) 6 (152) 7 (178) 8 (203)

FURNACE 110,000 66,000 88,000

EXAMPLES: Determining Free Area

WATER HEATER

TOTAL INPUT

30,000

=

(140,000 divided by 4,000) = 35.0 Sq. In. for each two Vertical Ducts or Openings

40,000

=

(106,000 divided by 3,000) = 35.3 Sq. In. for a Single Duct or Opening

30,000

=

(118,000 divided by 2,000) = 59.0 Sq. In. for each of two Horizontal Ducts

The Standard Method Use the Standard Method if:
1. The space has no less volume than 50 cubic feet per 1,000 BTUh of the maximum input ratings for all gas appliances installed in the space and
2. The air infiltration rate is not known to be less than 0.40 air changes per hour (ACH).
Use the Known Air Infiltration Rate Method if the infiltration rate is known to be:
1. Less than 0.40 ACH and
2. Equal to or greater than 0.10 ACH
Infiltration rates greater than 0.60 ACH shall not be used. The minimum required volume of the space varies with the number of ACH and shall be determined per Table 3 or Equations 1 and 2. Determine the minimum required volume for each appliance in the space and add the volumes together to get the total minimum required volume for the space.
Table 3 – Minimum Space Volumes were determined by using the following equations from the current edition of National Fuel Gas Code ANSI Z223.1/NFPA 54:
1. For other than fan-assisted appliances, such as a draft hood-equipped water heater:

If the following is applied to either equation:
· Iother = combined input of all other than fan-assisted appliances in BTUh/hr
· Ifan = combined input of all fan-assisted appliances in BTUh/hr
· ACH = air changes per hour (ACH shall not exceed 0.60.)
The following requirements apply to the Standard Method and to the Known Air Infiltration Rate Method.
1. Adjoining rooms can be considered part of a space if: a. There are no closeable doors between rooms. b. Combining spaces on same floor level. Each opening shall have free area of at least 1 in.2/1,000 BTUh (2,000 mm2/kW) of the total input rating of all gas appliances in the space, but not less than 100 in.2 (0.06 m2). One opening shall commence within 12″ (300 mm) of the ceiling and the second opening shall commence within 12″ (300 mm) of the floor. The minimum dimension of air openings shall be at least 3 in. (80 mm) (see Fig. 8). c. Combining space on different floor levels. The volumes of spaces on different floor levels shall be considered as communicating spaces if connected by one or more permanent openings in doors or floors having free area of at least 2 in.2/1,000 BTUh (4,400 mm2/kW) of total input rating of all gas appliances.

2. For fan-assisted appliances such as this furnace:

A04002

A04003
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 8

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Table 3 ­ Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors

ACH*
0.60 0.50 0.40 0.30 0.20 0.10 0.00

OTHER THAN FAN-ASSISTED TOTAL (1,000’S BTUH GAS INPUT RATE

30

40

50

1,050 1,260 1,575 2,100 3,150 6,300
NP

1,400 1,680 2,100 2,800 4,200 8,400
NP

1,750 2,100 2,625 3,500 5,250 10,500
NP

FAN-ASSISTED TOTAL (1,000’S BTUH GAS INPUT RATE)

44

66

Space Volume (ft.3)

1,100

1,650

1,320

1,980

1,650

2,475

2,200

3,300

3,300

4,950

6,600

9,900

NP

NP

88
2,200 2,640 3,300 4,400 6,600 13,200
NP

110
2,750 3,300 4,125 5,500 8,250 16,500
NP

132
3,300 3,960 4,950 6,600 9,900 19,800
NP

*. Air Changes/Hour

2. An attic or crawlspace may be considered a space that freely communicates with the outdoors provided there are adequate permanent ventilation openings directly to outdoors having free area of at least 1-in.2/4,000 BTUh of total input rating for all gas appliances in the space.
3. In spaces that use the Indoor Combustion Air Method, infiltration should be adequate to provide air for combustion, permanent ventilation and dilution of flue gases. However, in buildings with unusually tight construction, additional air MUST be provided using the methods described in the Outdoor Combustion Air Method section.
4. Unusually tight construction is defined as construction with: a. Walls and ceilings exposed to the outdoors have a continuous, sealed vapor barrier. Openings are gasketed or sealed and b. Doors and openable windows are weatherstripped and c. Other openings are caulked or sealed. These include joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical and gas lines, etc.
Combination of Indoor and Outdoor Air
1. Indoor openings shall comply with the Indoor Combustion Air Method below and,
2. Outdoor openings shall be located as required in the Outdoor Combustion Air Method mentioned previously and,
3. Outdoor openings shall be sized as follows: a. Calculate the Ratio of all Indoor Space volume divided by required volume for Indoor Combustion Air Method below. b. Outdoor opening size reduction Factor is 1 minus the Ratio in a. above. c. Minimum size of Outdoor openings shall be the size required in Outdoor Combustion Air Method above multiplied by reduction Factor in b. above. The minimum dimension of air openings shall be not less than 3 in. (80 mm).

Fig. 9 ­ Removing Bottom Closure Panel

A10273

Side Return Air Inlet

These furnaces are shipped with bottom closure panel installed in bottom return-air opening. This panel MUST be in place when only side return air is used.

NOTE: Side return-air openings can be used in UPFLOW and most HORIZONTAL configurations. Do not use side return-air openings in DOWNFLOW configuration.

Leveling Legs (If Desired)

In upflow position with side return inlet(s), leveling legs may be used (see Fig. 10). Install field-supplied, 5/16 x 1-1/2 in. (8 x 38 mm) (max) corrosion-resistant machine bolts, washers and nuts.

INSTALLATION UPFLOW INSTALLATION
Bottom Return Air Inlet These furnaces are shipped with bottom closure panel installed in bottom return-air opening. Remove and discard this panel when bottom return air is used. To remove bottom closure panel, perform the following:
1. Tilt or raise furnace and remove two screws holding bottom filler panel (see Fig. 9).
2. Rotate bottom filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.

Fig. 10 ­ Leveling Legs

A89014

NOTE: Bottom closure must be used when leveling legs are used. It may be necessary to remove and reinstall bottom closure panel to install leveling legs. To remove bottom closure panel, see Item 1. in Bottom Return Air Inlet section.

To install leveling legs:

1. Position furnace on its back. Locate and drill a hole in each bottom corner of furnace (see Fig. 10).

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 9

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions
2. For each leg, install nut on bolt and then install bolt and nut in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (Install flat washer if desired.)
4. Adjust outside nut to provide desired height, and tighten inside nut to secure arrangement.
5. Reinstall bottom closure panel if removed.
DOWNFLOW INSTALLATION
! CAUTION
EQUIPMENT OR PROPERTY DAMAGE Failure to follow this caution could result in equipment or property damage When furnace is installed in a downflow application, make sure water lines and other sources of water cannot drip or fail in such a way that water can collect on the blower motor, wiring, and furnace control board.
NOTE: For downflow applications, this furnace is approved for use on combustible flooring when any one of the following 3 accessories are used: · Manufacturer’s approved downflow combustible floor subbase · Manufacturer’s approved cased evaporator coil · Manufacturer’s approved evaporator coil casing 1. Determine application being installed from Table 4. 2. Construct hole in floor (see Table 4 and Fig. 11). 3. Construct plenum to dimensions specified (see Table 4 and Fig. 11). 4. If downflow subbase is used, install as shown in Fig. 12. If
manufacturer’s cased evaporator coil or coil casing is used, install as shown in see Fig. 13. NOTE: It is required that the perforated supply-air duct flanges be completely folded over or removed from furnace when installing the furnace on a factory-supplied cased coil or coil box. To remove the supply-air duct flange, use wide duct pliers or hand seamers to bend flange back and forth until it breaks off. Be careful of sharp edges. Refer to Duct Flanges (Fig. 17) in the “Air Ducts” section.

Fig. 12 ­ Furnace, Plenum, and Subbase Installed onA9a6285 Combustible Floor

Fig. 13 ­ Furnace, Plenum, and Coil Assembly or Coil Box Installed on a Combustible Floor

A08556

Fig. 11 ­ Floor and Plenum Opening Dimensions A96283 Bottom Return Air Inlet These furnaces are shipped with bottom closure panel installed in bottom return-air opening. Remove and discard this panel when bottom return air is used. To remove bottom closure panel, perform the following:
1. Tilt or raise furnace and remove two screws holding bottom filler panel (see Fig. 9).
2. Rotate bottom filler panel downward to release holding tabs. 3. Remove bottom closure panel. 4. Reinstall bottom filler panel and screws
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 10

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Table 4 ­ Opening Dimensions – In. (mm)

FURNACE CASING WIDTH
14­3/16 (360)
17­1/2 (445)
21 (533)
24-1/2 (622)

APPLICATION
Upflow Applications on Combustible or Noncombustible Flooring (subbase not required)
Downflow Applications on Noncombustible Flooring (subbase not required)
Downflow Applications on Combustible Flooring (subbase required)
Downflow Applications on Combustible Flooring with Cased Coil (subbase not required)
Upflow Applications on Combustible or Noncombustible Flooring (subbase not required)
Downflow Applications on Noncombustible Flooring (subbase not required)
Downflow Applications on Combustible Flooring (subbase required)
Downflow Applications on Combustible Flooring with Cased Coil (subbase not required)
Upflow Applications on Combustible or Noncombustible Flooring (subbase not required)
Downflow Applications on Noncombustible Flooring (subbase not required)
Downflow Applications on Combustible Flooring (subbase required)
Downflow Applications on Combustible Flooring with Cased Coil (subbase not required)
Upflow Applications on Combustible or Noncombustible Flooring (subbase not required)
Downflow Applications on Noncombustible Flooring (subbase not required)
Downflow Applications on Combustible flooring (subbase required)
Downflow Applications on Combustible Flooring with Cased Coil (subbase not required)

PLENUM OPENING

A

B

12-11/16 (322)

21-5/8 (549)

12-9/16 (319)

19 (483)

11-13/16 (284)

19 (483)

12-5/16 (319)

19 (483)

16 (406)

21-5/8 (549)

15-7/8 (403)

19 (483)

15-1/8 (384)

19 (483)

15-1/2 (394)

19 (483)

19-1/2 (495)

21-5/8 (549)

19-3/8 (492)

19 (483)

18-5/8 (473)

19 (483)

19 (483)

19 (483)

23 (584)

21-1/8 (537)

22-7/8 (581)

19 (483)

22-1/8 (562)

19 (483)

22-1/2 (572)

19 (483)

FLOOR OPENING

C

D

13-5/16 (338)

22-1/4 (565)

13-3/16 (335)

19-5/8 (498)

13-7/16 (341)

20-5/8 (600)

13-5/16 (338)

20 (508)

16-5/8 (422)

22-1/4 (565)

16-1/2 (419)

19-5/8 (498)

16-3/4 (425)

20-5/8 (600)

16-1/2 (419)

20 (508)

20-1/8 (511)

22-1/4 (565)

20 (508)

19-5/8 (498)

20-1/4 (514)

20-5/8 (600)

20 (508)

20 (508)

23-5/8 (600)

22-1/4 (565)

23-1/2 (597)

19-5/8 (498)

23-3/4 (603)

20-5/8 (600)

23-1/2 (597)

20 (508)

! WARNING
FIRE, EXPLOSION, AND CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Do not install the furnace on its back or hang furnace with control compartment facing downward. Safety control operation will be adversely affected. Never connect return-air ducts to the back of the furnace.

from the furnace sides, so that the strap attachment screws are not in tension (are loaded in shear) for reliable support.
Platform Furnace Support
Construct working platform at location where all required furnace clearances are met (see Fig. 2 and Fig. 14). For furnaces with 1-in. (25 mm) clearance requirement on side, set furnace on noncombustible blocks, bricks or angle iron. For crawl space installations, if the furnace is not suspended from the floor joists, the ground underneath furnace must be level and the furnace set on blocks or bricks.

HORIZONTAL INSTALLATION
The furnace can be installed horizontally in an attic or crawl space on either the left-hand (LH) or right-hand (RH) side. The furnace can be hung from floor joists, rafters or trusses or installed on a non-combustible platform, blocks, bricks or pad.
Suspended Furnace Support
The furnace may be supported under each end with threaded rod, angle iron or metal plumber’s strap as shown (see Fig. 15 and Fig. 16). Secure angle iron to bottom of furnace as shown. Heavy-gauge sheet metal straps (plumber’s straps) may be used to suspend the furnace from each bottom corner. To prevent screws from pulling out, use 2 #8 x 3/4-in. (19 mm) screws into the side and 2 #8 x 3/4-in. (19 mm) screws in the bottom of the furnace casing for each strap (see Fig. 15 and Fig. 16). If the screws are attached to ONLY the furnace sides and not the bottom, the straps must be vertical against the furnace sides and not pull away

Fig. 14 ­ Typical Attic Installation

A10164

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 11

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions
Not all horizontal furnaces are approved for side return air connections (see Fig. 20).
FILTER ARRANGEMENT

! WARNING
CARBON MONOXIDE AND POISONING HAZARD Failure to follow this warning could result in personal injury, or death. Never operate a furnace without a filter or with filter access door removed.

Fig. 15 ­ Horizontal Unit Suspension

A10130

Roll-Out Protection

Provide a minimum 17-3/4 in. x 22 in. (451 mm x 559 mm) piece of sheet metal for flame roll-out protection in front of burner area for furnaces closer than 12 inches (305 mm) above the combustible deck or suspended furnaces closer than 12 inches (305 mm) to joists. The sheet metal MUST extend underneath the furnace casing by 1 in. (25 mm) with the door removed. The bottom closure panel on furnaces of widths 17-1/2 in. (445 mm) and larger may be used for flame roll-out protection when bottom of furnace is used for return air connection. See Fig. 14 for proper orientation of roll-out shield.

Fig. 16 ­ Horizontal Suspension with Straps

A10131

Bottom Return Air Inlet

These furnaces are shipped with bottom closure panel installed in bottom return-air opening. Remove and discard this panel when bottom return air is used. To remove bottom closure panel, perform the following:

1. Tilt or raise furnace and remove two screws holding bottom filler panel (see Fig. 9).

2. Rotate bottom filler panel downward to release holding tabs.

3. Remove bottom closure panel.

4. Reinstall bottom filler panel and screws. Side Return Air Inlet

Side Return Air Inlet

These furnaces are shipped with bottom closure panel installed in bottom return-air opening. This panel MUST be in place when side return air inlet(s) is used without a bottom return air inlet.

There are no provisions for an internal filter rack in these furnaces.
A field-supplied accessory external filter is required.
Refer to the instructions supplied with the external filter rack for assembly and installation options.
AIR DUCTS
GENERAL REQUIREMENTS
The duct system should be designed and sized according to accepted national standards such as those published by: Air Conditioning Contractors Association (ACCA), Sheet Metal and Air Conditioning Contractors National Association (SMACNA) or American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) or consult The Air Systems Design Guidelines reference tables available from your local distributor. The duct system should be sized to handle the required system design CFM at the design external static pressure. The furnace airflow rates are provided in Table 9-AIR DELIVERY-CFM (with filter).
When a furnace is installed so that the supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by duct(s) sealed to the furnace casing and terminating outside the space containing the furnace. Secure ductwork with proper fasteners for type of ductwork used. Seal supply- and return-duct connections to furnace with code approved tape or duct sealer.
NOTE: Flexible connections should be used between ductwork and furnace to prevent transmission of vibration. Ductwork passing through unconditioned space should be insulated and sealed to enhance system performance. When air conditioning is used, a vapor barrier is recommended.
Maintain a 1-in. (25 mm) clearance from combustible materials to supply air ductwork for a distance of 36 in. (914 mm) horizontally from the furnace. See NFPA 90B or local code for further requirements.
Ductwork Acoustical Treatment
NOTE: Metal duct systems that do not have a 90 degree elbow and 10 ft. (3 M) of main duct to the first branch take-off may require internal acoustical lining. As an alternative, fibrous ductwork may be used if constructed and installed in accordance with the latest edition of SMACNA construction standard on fibrous glass ducts. Both acoustical lining and fibrous ductwork shall comply with NFPA 90B as tested by UL Standard 181 for Class 1 Rigid air ducts.
SUPPLY AIR CONNECTIONS
For a furnace not equipped with a cooling coil, the outlet duct shall be provided with a removable access panel. This opening shall be accessible when the furnace is installed and shall be of such a size that the heat exchanger can be viewed for possible openings using light assistance or a probe can be inserted for sampling the airstream. The cover attachment shall prevent leaks.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 12

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Upflow and Horizontal Furnaces
Connect supply-air duct to flanges on furnace supply-air outlet. Bend flange upward to 90° with wide duct pliers (see Fig. 17). The supply-air duct must be connected to ONLY the furnace supply-outlet-air duct flanges or air conditioning coil casing (when used). DO NOT cut main furnace casing side to attach supply air duct, humidifier, or other accessories. All accessories MUST be connected to duct external to furnace main casing.
NOTE: For horizontal applications, the top-most flange may be bent past 90 degrees to allow the evaporator coil to hang on the flange temporarily while the remaining attachment and sealing of the coil are performed.
Downflow Furnaces
Connect supply-air duct to supply-air outlet on furnace. Bend flange inward past 90° with wide duct pliers (see Fig. 17). The supply-air duct must be connected to ONLY the furnace supply outlet or air conditioning coil casing (when used). When installed on combustible material, supply-air duct must be connected to ONLY the factory-approved accessory subbase or a factory- approved air conditioning coil casing. DO NOT cut main furnace casing to attach supply side air duct, humidifier, or other accessories. All accessories MUST be connected to duct external to furnace casing.
Return Air Connections

Fig. 18 ­ Downflow Return Air Configurations and RestrictioAn0s2163

! CAUTION

FIRE HAZARD Failure to follow this warning could cause personal injury, death and/or property damage. Never connect return-air ducts to the back of the furnace. Follow instructions below.

Fig. 19 ­ Upflow Return Air Configurations and RestrictionAs02075

Fig. 17 ­ Duct Flanges

A190346

Downflow Furnaces

The return-air duct must be connected to return-air opening bottom inlet (see Fig. 1). DO NOT cut into casing sides (left or right). Side opening is permitted for only upflow and most horizontal furnaces (see Fig. 18). Bypass humidifier connections should be made at ductwork or coil casing sides exterior to furnace.

Upflow Furnaces

The return-air duct must be connected to bottom, sides (left or right), or a combination of bottom and side(s) of main furnace casing (see Fig. 19 and Fig. 20). Bypass humidifier may be attached into unused return air side of the furnace casing (see Fig. 19 and Fig. 20). Not all horizontal furnaces are approved for side return air connections (see Fig. 20).

Fig. 20 ­ Horizontal Return Air Configurations and RestrictioAn02s162
GAS PIPING
Gas piping must be installed in accordance with national and local codes. Refer to current edition of NFGC.
Installations must be made in accordance with all authorities having jurisdiction. If possible, the gas supply line should be a separate line running directly from meter to furnace.
NOTE: In the state of Massachusetts: 1. Gas supply connections MUST be performed by a licensed plumber
or gas fitter. 2. When flexible connectors are used, the maximum length shall not
exceed 36 inches (915 mm).
3. When lever handle type manual equipment shutoff valves are used, they shall be T-handle valves.
4. The use of copper tubing for gas piping is NOT approved by the state of Massachusetts.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 13

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

! WARNING
FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life. Use proper length of pipe to avoid stress on gas control manifold and gas valve. Gas valve inlet and/or inlet pipe must remain capped until gas supply line is permanently installed to protect the valve from moisture and debris. Also, install a sediment trap in the gas supply piping at the inlet to the gas valve.

be installed immediately upstream of gas supply connection to furnace and downstream of manual equipment shutoff valve.
NOTE: The furnace gas control valve inlet pressure tap connection is suitable to use as test gauge connection providing test pressure DOES NOT exceed maximum 0.5 psig (14-in. w.c.) stated on gas control valve (see Fig. 21).

Refer to Table 5 for recommended gas pipe sizing. Risers must be used to connect to furnace and to meter. Support all gas piping with appropriate straps, hangers, etc. Use a minimum of 1 hanger every 6 ft. (2 M). Joint compound (pipe dope) should be applied sparingly and only to male threads of joints. Pipe dope must be resistant to the action of propane gas.
Table 5 ­ Maximum Capacity of Pipe*

NOMINAL IRON PIPE

INTERNAL DIAMETER

LENGTH OF PIPE – FT. (M)

SIZE IN. (mm)
1/2 (13) 3/4 (19) 1 (25) 1-1/4 (32) 1-1/2 (38)

In. (mm)

10

20

30

40

50

0.622 (16) 0.824 (21) 1.049 (27) 1.380 (35) 1.610 (41)

175 (53) 120 (37) 97 (30) 82 (25) 73 (22) 360 (110) 250 (76) 200 (61) 170 (52) 151 (46) 680 (207) 465 (142) 375 (114) 320 (98) 285 (87) 1400 (427) 950 (290) 770 (235) 660 (201) 580 (177) 2100 (640) 1460 (445) 1180 (360) 990 (301) 900 (274)

• Cubic ft. of natural gas per hr for gas pressures of 0.5 psig (14-in. w.c.) or less and a pressure drop of 0.5-in. w.c. (based on a 0.60 specific gravity gas). Ref: Chapter 6 current edition of ANSI Z223/NFPA 54.

! WARNING

FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage.
If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. Do not use a connector which has previously served another gas appliance. Black iron pipe shall be installed at the furnace gas control valve and extend a minimum of 2 in.(51 mm) outside the furnace.

Fig. 21 ­ Gas Control Valve

A06666

Some installations require gas entry on right side of furnace (as viewed in upflow.) (See Fig. 22).

Fig. 22 ­ Burner and Manifold

A08551

Install a sediment trap in riser leading to furnace (see Fig. 23). Connect a capped nipple into lower end of tee. Capped nipple should extend below level of furnace gas controls. Place a ground joint union between furnace gas control valve and exterior manual equipment gas shutoff valve.

A 1/8-in. (3 mm) NPT plugged tapping, accessible for test gauge connection, MUST be installed immediately upstream of gas supply connection to furnace and downstream of manual equipment shutoff valve.

! CAUTION
FURNACE OVERHEAT HAZARD Failure to follow this caution may result in property damage. Connect gas pipe to gas valve using a backup wrench to avoid damaging gas controls and burner misalignment.
An accessible manual equipment shutoff valve MUST be installed external to furnace casing and within 6 ft. (2 M) of furnace. A 1/8-in. (3 mm) NPT plugged tapping, accessible for test gauge connection, MUST

Fig. 23 ­ Typical Gas Pipe Arrangement

A02035

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 14

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Piping should be pressure and leak tested in accordance with NFGC in the United States, local, and national plumbing and gas codes before the furnace has been connected. After all connections have been made, purge lines and check for leakage at furnace prior to operating furnace.
If pressure exceeds 0.5 psig (14-in. w.c.), gas supply pipe must be disconnected from furnace and capped before and during supply pipe pressure test. If test pressure is equal to or less than 0.5 psig (14-in. w.c.), turn off electric shutoff switch located on furnace gas control valve and accessible manual equipment shutoff valve before and during supply pipe pressure test. After all connections have been made, purge lines and check for leakage at furnace prior to operating furnace.
The gas supply pressure shall be within the maximum and minimum inlet supply pressures marked on the rating plate with the furnace burners ON and OFF.
ELECTRICAL CONNECTIONS
See Fig. 24 for field wiring diagram showing typical field 115-V wiring. Check all factory and field electrical connections for tightness.
Field-supplied wiring shall conform with the limitations of 63°F (35°C) rise.
! WARNING
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow safety warnings could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death or property damage.
– Before servicing, disconnect all electrical power to furnace.
– When servicing controls, label all wires prior to disconnection. Reconnect wires correctly.
– Verify proper operation after servicing.
– Always reinstall access doors after completing service and maintenance.

! CAUTION
FURNACE MAY NOT OPERATE
Failure to follow this caution may result in intermittent furnace operation.
Furnace control must be grounded for proper operation or else control will lock out. Control must remain grounded through green/yellow wire routed to gas valve and manifold bracket screw.
115-V WIRING Verify that the voltage, frequency, and phase correspond to that specified on unit rating plate. Also, check to be sure that service provided by utility is sufficient to handle load imposed by this equipment. Refer to rating plate or Table 6 for equipment electrical specifications.
U.S. Installations: Make all electrical connections in accordance with National Electrical Code (NEC) NFPA 70 and any local codes or ordinances that might apply.
Use a separate, fused branch electrical circuit with a properly sized fuse or circuit breaker for this furnace. See Table 6 for wire size and fuse specifications. A readily accessible means of electrical disconnect must be located within sight of the furnace.
NOTE: Proper polarity must be maintained for 115-V wiring. If polarity is incorrect, control LED status indicator light will flash rapidly and Status code (10.1) is displayed. The furnace will NOT operate.

! WARNING
ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Blower access panel door switch opens 115-V power to control. No component operation can occur. Do not bypass or close switch with panel removed.
! WARNING
ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow this warning could result in personal injury, death, or property damage. The cabinet MUST have an uninterrupted or unbroken ground according to current edition of NEC NFPA 70 or local codes to minimize personal injury if an electrical fault should occur. This may consist of electrical wire, conduit approved for electrical ground or a listed, grounded power cord (where permitted by local code) when installed in accordance with existing electrical codes. Refer to the power cord manufacturer’s ratings for proper wire gauge. Do not use gas piping as an electrical ground.

Fig. 24 ­ Heating and Cooling Application Wiring Diagram wA1it9h0079 1-Stage Thermostat

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 15

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Unit Size
045M14–12 045M17–14 070M14–12 070M17–12 070M17–16 070M21–16 090M17–14 090M21–16 090M21–20 110M21–20 110M24–20 135M24–20

VoltsHertzPhase 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1

Table 6 ­ Electrical Data

Operating Voltage* Range Maximum Minimum

Maximum Unit Amps

Unit Ampacity

127

104

6.0

8.3

127

104

7.9

10.7

127

104

6.0

8.3

127

104

5.9

8.2

127

104

10.4

13.8

127

104

10.4

13.8

127

104

8.2

11.0

127

104

8.2

11.0

127

104

13.9

18.1

127

104

14.4

18.6

127

104

11.1

14.6

127

104

11.0

14.4

Minimum Wire Size AWG
14 14 14 14 14 14 14 14 12 12 14 14

Maximum Wire Length Ft. (M) 44 (13.6) 34 (10.6) 44 (13.6) 45 (13.8) 26 (8.2) 26 (8.2) 34 (10.3) 34 (10.3) 31 (9.6) 30 (9.4) 25 (7.7) 25 (7.8)

Maximum Fuse or CKT BKR Amps** 15 15 15 15 15 15 15 15 20 20 15 15

*. Permissible limits of the voltage range at which the unit operates satisfactorily. . Unit ampacity = 125 percent of largest operating component’s full load amps plus 100 percent of all other potential operating components’ (EAC, humidifier, etc.) full load
amps. . Length shown is as measured one way along wire path between unit and service panel for maximum 2 percent voltage drop. **. Time-delay type is recommended.

! WARNING

FIRE HAZARD Failure to follow this warning could result in personal injury, death, or property damage.
Do not connect aluminum wire between disconnect switch and furnace. Use only copper wire (see Fig. 25).

Fig. 25 ­ Field-Supplied External Electrical Box on Furnace CAa1s9i0n27g9
J-BOX RELOCATION
NOTE: If factory location of J-Box is acceptable, go to next section (ELECTRICAL CONNECTION TO J-BOX).
NOTE: On 14-in. (356 mm) wide casing models, the J-Box shall not be relocated to other side of furnace casing when the vent pipe is routed within the casing.
1. Remove and save two screws holding J-Box.
NOTE: The J-Box cover need not be removed from the J-Box in order to move the J-Box. Do NOT remove green ground screw inside J-Box (see Fig. 26).
2. Cut wire tie on loop in furnace wires attached to J-box.
3. Move J-Box to desired location.
4. Fasten J-Box to casing with two screws removed in Step 1.
5. Route J-Box wires within furnace away from sharp edges, rotating parts and hot surfaces.

Fig. 26 ­ Relocating J-Box
Electrical Connection to J-Box Electrical Box on Furnace Casing Side

A10291

! WARNING
FIRE OR ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury, death, or property damage.
High voltage field connections must be located in J-Box with furnace, or in field supplied external disconnect mounted to furnace. If field-supplied manual disconnect switch is to be mounted on furnace casing side, select a location where a drill or fastener cannot damage electrical or gas components.

1. Refer to Fig. 27 when installing an electrical box.
2. Select and remove a hole knockout in the casing where the electrical box is to be installed.
NOTE: Check that duct on side of furnace will not interfere with installed electrical box.
3. Remove the desired electrical box hole knockout and position the hole in the electrical box over the hole in the furnace casing.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 16

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

4. Fasten the electrical box to casing by driving two field supplied screws from inside electrical box into casing steel.
A190278
Fig. 27 ­ Field-Supplied Electrical Box on Furnace Casing 5. Remove and save two screws holding J-Box. 6. Pull furnace power wires out of 1/2-in. (12 mm) diameter hole in
J-Box. Do not loosen wires from strain-relief wire-tie on outside of J-Box. 7. Route furnace power wires through holes in casing and electrical box and into electrical box. 8. Pull field power wires into electrical box. 9. Remove cover from furnace J-Box. 10. Route field ground wire through holes in electrical box and casing, and into furnace J-Box. 11. Reattach furnace J-Box to furnace casing with screws removed in Step 4. 12. Secure field ground wire to J-Box green ground screw. 13. Complete electrical box wiring and installation. Connect line voltage leads (see Fig. 24). Use best practices (NEC in U.S. for wire bushings, strain relief, etc.) 14. Reinstall cover to J-Box. Do not pinch wires between cover and bracket. Power Cord Installation in Furnace J-Box NOTE: Power cords must be able to handle the electrical requirements listed in Table 6. Refer to power cord manufacturer’s listings. 1. Remove cover from J-Box. 2. Route listed power cord through 7/8-in. (22 mm) diameter hole in J-Box. 3. Secure power cord to J-Box bracket with a strain relief bushing or a connector approved for the type of cord used. 4. Secure field ground wire to green ground screw on J-Box bracket. 5. Connect line voltage leads (see Fig. 24). 6. Reinstall cover to J-Box. Do not pinch wires between cover and bracket. BX Cable Installation in Furnace J-Box 1. Remove cover from J-Box. 2. Route BX cable into 7/8-inch diameter hole in J-Box. 3. Secure BX cable to J-Box bracket with connectors approved for the type of cable used.

4. Secure field ground wire to green ground screw on J-Box bracket.
5. Connect line voltage leads (see Fig. 24).
6. Reinstall cover to J-Box. Do not pinch wires between cover and bracket.
24-V Wiring
Make field 24-V connections at the 24-V terminal strip (see Fig. 20). Connect terminal Y for proper cooling operation (see Fig. 28). Use only AWG No. 18, color-coded, copper thermostat wire.
The 24-V circuit contains an automotive-type, 3-amp. fuse located on the control. Any direct shorts during installation, service, or maintenance could cause this fuse to blow. If fuse replacement is required, use ONLY a 3-amp. fuse of identical size.
ACCESSORIES
1. Electronic Air Cleaner (EAC) Connect an accessory Electronic Air Cleaner (if used) using 1/4-in female quick connect terminals to the two male 1/4-in quick-connect terminals on the control board marked EAC-1 and EAC-2. The terminals are rated for 115 VAC, 1.0 amps maximum and are energized during blower motor operation (see Fig. 28).
2. Humidifier (HUM) Connect an accessory 24 VAC, 0.5 amp. maximum humidifier (if used) to the 1/4-in male quick-connect HUM terminal and COM-24V screw terminal on the control board thermostat strip. The HUM terminal is energized when the pressure switch closes during a call for heat (see Fig. 28).
NOTE: DO NOT connect furnace control HUM terminal to HUM (humidifier) terminal on Thermidistatt, Zone Controller or similar device. See Thermidistat, Zone Controller, thermostat, or controller manufacturer’s instructions for proper connection.
NOTE: For 24-V & 115-V EAC or Humidifier Accessory details, see Accessory instructions.

Fig. 28 ­ Furnace Control

A210192

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 17

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Fig. 29 ­ Thermostat Wiring Diagrams
Notes for thermostat wiring diagrams 1. Heat pump MUST have a high pressure switch for HYBRID
HEAT® dual fuel applications.
2. Refer to outdoor equipment Installation Instructions for additional information and setup procedure.
3. If the heat pump date code is 1501E or earlier, select the “ZONE” position on the two speed heat pump control. Heat pumps with date code 1601E and later do not have or require a “ZONE” selection.
4. Outdoor Air Temperature Sensor must be attached in all HYBRID HEAT® dual fuel applications.
5. Configure the thermostat for air conditioner, installations. Refer to thermostat instructions.
6. Configure the thermostat for heat pump installations. Refer to thermostat instructions.
7. Configure the thermostat for single-stage compressor installations. Refer to thermostat instructions.
8. Configure the thermostat for HYBRID HEAT® dual fuel operation installations. Refer to thermostat instructions.
9. NO connection should be made to the furnace HUM terminal when using a thermostat with a 24 volt humidifier output.
10. When connecting humidifier with its own 115 VAC supply use isolation relay between furnace and humidifier.
11. If thermostat has internal control of heat pump balance point, DO NOT SELECT the “FURNACE INTERFACE” or “BALANCE POINT” option on the two-speed heat pump control board. Refer to thermostat instructions.
12. Thermostat signals may vary. Consult thermostat installation instructions for more information.
VENTING
The furnace shall be connected to a listed factory built chimney or vent, or a clay-tile lined masonry or concrete chimney. Venting into an unlined masonry chimney or concrete chimney is prohibited.
When an existing Category I furnace is removed or replaced, the original venting system may no longer be sized to properly vent the attached appliances. An improperly sized Category I venting system could cause the formation of condensate in the furnace and vent, leakage of condensate and combustion products, and spillage of combustion products into the living space.

A200134
Vent system or vent connectors may need to be resized. Vent systems or vent connectors, must be sized to approach minimum size as determined using appropriate table found in the NFGC.
GENERAL VENTING REQUIREMENTS
Follow all safety codes for proper vent sizing and installation requirements, including local building codes, the current edition of National Fuel Gas Code ANSI Z223.1/NFPA 54 (NFGC), Parts 12 and 13, the local building codes, and furnace and vent manufacturers’ instructions.
These furnaces are design-certified as Category I furnaces in accordance with current edition of ANSI Z21.47/CSA 2.3 and operate with a non-positive vent static pressure to minimize the potential for vent gas leakage. Category I furnaces operate with a flue loss not less than 17 percent to minimize the potential for condensation in the venting system. These furnaces are approved for common venting and multistory venting with other fan assisted or draft hood equipped appliances in accordance with the NFGC, the local building codes, and furnace and vent manufacturers’ instructions.
The following information and warning must be considered in addition to the requirements defined in the NFGC.
1. If a vent (common or dedicated) becomes blocked, the furnace will be shut off by the draft safeguard switch located on the vent elbow.
2. Do not vent this Category I furnace into a single-wall dedicated or common vent. The dedicated or common vent is considered to be the vertical portion of the vent system that terminates outdoors.
3. Vent connectors serving Category I furnaces shall not be connected into any portion of a mechanical draft system operating under positive pressure.
4. Do not vent this appliance with any solid fuel burning appliance.
5. Category I furnaces must be vented vertically or nearly vertically unless equipped with a listed power venter.
6. Do not vent this appliance into an unlined masonry chimney. (Refer to Chimney Inspection Chart, Fig. 30).

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 18

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Fig. 30 ­ Chimney Inspection Chart

A10133

MASONRY CHIMNEY REQUIREMENTS

NOTE: These furnaces are CSA design-certified for use in exterior tile-lined masonry chimneys with a factory accessory Chimney Adapter Kit. Refer to the furnace rating plate for correct kit usage. The Chimney Adapter Kits are for use with ONLY furnaces having a Chimney Adapter

Kit numbers marked on the furnace rating plate.

If a clay tile-lined masonry chimney is being used and it is exposed to

the outdoors below the roof line, relining might be required. Chimneys shall conform to the Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances current edition of ANSI/NFPA 211 and must be in good condition.

U.S.A.– Refer to Sections 13.1.8 and 13.2.20 of the current edition of NFGC NFPA54/ANSI Z223.1 or the authority having jurisdiction to determine whether relining is required. If relining is required, use a properly sized listed metal liner, Type-B vent, or a listed alternative venting design.

NOTE: See the current edition of NFPA54/ANSI Z223.1, 13.1.8 and 13.2.20 regarding alternative venting design and the Exception, which cover installations such as the Chimney Adapter Kits, which are listed for use with these furnaces. See Product Data Sheet for accessory listing.

! WARNING
CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death. The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:
– Seal any unused openings in venting system.
– Inspect the venting system for proper size and horizontal pitch, as required in the current edition of National Fuel Gas Code, ANSI Z223.1/NFPA 54 and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.
– As far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building.
– Close fireplace dampers.
– Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they are operating at maximum speed. Do not operate a summer exhaust fan.
– Follow the lighting instructions. Place the appliance being inspected into operation. Adjust the thermostat so appliance is operating continuously.
– Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle.
– If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the current edition of National Fuel Gas Code, ANSI Z223.1/NFPA 54.
– After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-fired burning appliance to their previous conditions of use.
The Chimney Adapter Kit is listed alternative venting system for these furnaces. See the kit instructions for complete details.
This furnace is permitted to be vented into a clay tile-lined masonry chimney that is exposed to the outdoors below the roof line, provided:
1. Vent connector is Type-B double-wall, and
2. This furnace is common vented with at least 1 draft hood equipped appliance, and
3. The combined appliance input rating is less than the maximum capacity given in Table 7, and
4. The input rating of each space heating appliance is greater than the minimum input rating given in Table 8 for the local 99% Winter Design Temperature. Chimneys having internal areas greater than 38 square inches require furnace input ratings greater than the input ratings of these furnaces. See footnote at bottom of Table 8, and
5. The authority having jurisdiction approves.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 19

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Exterior Masonry Chimney FAN + NAT Installations with Type-B Double Wall Vent Connectors© NFPA & AGA
Table 7 ­ Combined Appliance Maximum Input Rating in Thousands of BTUh per Hour

VENT HEIGHT FT. (M)
6 (1.8) 8 (2.4) 10 (3.0) 15 (4.5) 20 (6.0) 30 (9.1)

INTERNAL AREA OF CHIMNEY IN2 (MM2)

12 (7741)
74 80 84 NR NR NR

19 (12258)
119 130 138 152 NR NR

28 (18064)
178 193 207 233 250 NR

38 (24516)
257 279 299 334 368 404

If all of these conditions cannot be met, an alternative venting design shall be used, such as the listed chimney adapter kit with these furnaces, which are listed for use with the kit, a listed chimney-lining system, or a Type-B common vent.

Table 8 ­ Minimum Allowable Input Rating of Space-Heating Appliance in Thousands of BTUh per Hour

VENT HEIGHT FT (M)

INTERNAL AREA OF CHIMNEY IN2. (MM2)

12 (7741)

19 (12258)

28 (18064)

38 (24516)

Local 99% Winter Design Temperature: 17 to 26°F (-8 to -3°C)

6 (1.8)

0

55

99

141

8 (2.4)

52

74

111

154

10 (3.0)

NR

90

125

169

15 (4.6)

NR

NR

167

212

20 (6.1)

NR

NR

212

258

30 (9.1)

NR

NR

NR

362

Local 99% Winter Design Temperature: 5 to 16°F* (-15 to -9°C)

6 (1.8)

NR

78

121

166

8 (2.4)

NR

94

135

182

10 (3.0)

NR

111

149

198

15 (4.6)

NR

NR

193

247

20 (6.1)

NR

NR

NR

293

30 (9.1)

NR

NR

NR

377

Local 99% Winter Design Temperature: -10 to 4°F* (-23 to -16°C)

6 (1.8)

NR

NR

145

196

8 (2.4)

NR

NR

159

213

10 (3.0)

NR

NR

175

231

15 (4.6)

NR

NR

NR

283

20 (6.1)

NR

NR

NR

333

30 (9.1)

NR

NR

NR

NR

Local 99% Winter Design Temperature: -11°F (-24°C) or lower

Not recommended for any vent configuration.

• The 99.6% heating db temperatures found in the 1997 or 2001 ASHRAE Fundamentals Handbook, Climatic Design Information chapter, Table 1A (United States) or the 2005 ASHRAE Fundamentals handbook, Climatic Design Information chapter, and the CD-ROM included with the 2005 ASHRAE Fundamentals Handbook.
  Inspections before the sale and at the time of installation will determine the acceptability of the chimney or the need for repair and/or (re)lining. Refer to the Fig. 30 to perform a chimney inspection. If the inspection of a previously used tile-lined chimney:

a. Shows signs of vent gas condensation, the chimney should be relined in accordance with local codes and the authority having jurisdiction. The chimney should be relined with a listed metal liner, Type-B vent, or a listed chimney adapter kit shall be used to reduce condensation. If a condensate drain is required by local code, refer to the current edition of NFGC NFPA54/ANSI Z223.1, Section 12.10 for additional information on condensate drains.
b. Indicates the chimney exceeds the maximum permissible size in the tables, the chimney should be rebuilt or relined to conform to the requirements of the equipment being installed and the authority having jurisdiction.
A chimney without a clay tile liner, which is otherwise in good condition, shall be rebuilt to conform to current edition of ANSI/NFPA 211 or be lined with a UL listed metal liner or UL listed Type-B vent. Relining with a listed metal liner or Type-B vent is considered to be a vent-in-a-chase.
If a metal liner or Type-B vent is used to line a chimney, no other appliance shall be vented into the annular space between the chimney and the metal liner.
APPLIANCE APPLICATION REQUIREMENTS Appliance operation has a significant impact on the performance of the venting system. If the appliances are sized, installed, adjusted, and operated properly, the venting system and/or the appliances should not suffer from condensation and corrosion. The venting system and all appliances shall be installed in accordance with applicable listings, standards, and codes.
The furnace should be sized to provide 100 percent of the design heating load requirement plus any margin that occurs because of furnace model size capacity increments. Heating load estimates can be made using approved methods available from Air Conditioning Contractors of America (Manual J); American Society of Heating, Refrigerating, and Air-Conditioning Engineers; or other approved engineering methods. Excessive oversizing of the furnace could cause the furnace and/or vent to fail prematurely. When a metal vent or metal liner is used, the vent must be in good condition and be installed in accordance with the vent manufacturer’s instructions.
To prevent condensation in the furnace and vent system, the following precautions must be observed:
1. The return-air temperature must be at least 60°F (16°C)db except for brief periods of time during warm-up from setback at no lower than 55°F (13°C) db or during initial start-up from a standby condition.
2. Adjust the gas input rate per the installation instructions. Low gas input rate causes low vent gas temperatures, causing condensation and corrosion in the furnace and/or venting system. Derating is permitted only for altitudes above 2000 ft. (610 M).
3. Adjust the air temperature rise to the midpoint of the rise range or slightly above. Low air temperature rise can cause low vent gas temperature and potential for condensation problems.
4. Set the thermostat heat anticipator or cycle rate to reduce short cycling.
! CAUTION
BURN HAZARD
Failure to follow this caution may cause personal injury.
Hot vent pipe is within reach of small children when installed in downflow position. See the following instruction.
Air for combustion must not be contaminated by halogen compounds which include chlorides, fluorides, bromides, and iodides. These compounds are found in many common home products such as

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 20

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

detergent, paint, glue, aerosol spray, bleach, cleaning solvent, salt, and air freshener, and can cause corrosion of furnaces and vents. Avoid using

1. Attach the single wall vent connector to the furnace vent elbow, and fasten the vent connector to the vent elbow with at least two

such products in the combustion-air supply. Furnace use during

field-supplied, corrosion-resistant, sheet metal screws located 180°

construction of the building could cause the furnace to be exposed to

apart.

halogen compounds, causing premature failure of the furnace or venting system due to corrosion.

NOTE: An accessory flue extension is available to extend from the furnace elbow to outside the furnace casing. See Product Data Sheet for

Vent dampers on any appliance connected to the common vent can cause condensation and corrosion in the venting system. Do not use vent

accessory listing. If flue extension is used, fasten the flue extension to the vent elbow with at least two field-supplied, corrosion-resistant, sheet

dampers on appliances common vented with this furnace.

metal screws located 180° apart. Fasten the vent connector to the flue

ADDITIONAL VENTING REQUIREMENTS
A 4″ (101 mm) round vent elbow is supplied with the furnace. A 5-inch (127 mm) or 6- inch (152 mm) vent connector may be required for some model furnaces. A field-supplied 4-inch-to-5-inch (101 – 127 mm) or 4-inch-to-6-inch (101 – 152 mm) sheet metal increaser fitting is required

extension with at least two field-supplied, corrosion resistant sheet metal screws located 180° apart.
2. Vent the furnace with the appropriate connector (see Fig. 31 Fig. 43).
3. Determine the correct location of the knockout to be removed.

when 5-inch (127 mm) or 6-inch (152 mm) vent connector is used. See Fig. 31 – Fig. 43 Venting Orientation for approved vent configurations.

4. Use a hammer and screwdriver to strike a sharp blow between the tie points and work the slug back and forth until the slug breaks

NOTE: Vent connector length for connector sizing starts at furnace vent elbow. The 4-inch vent elbow is shipped for upflow configuration and may be rotated for other positions. Remove the 3 screws that secure vent elbow to furnace, rotate furnace vent elbow to position desired, reinstall screws. The factory- supplied vent elbow does NOT count as part of the number of vent connector elbows.

free.
An accessory Vent Guard Kit is REQUIRED for downflow applications where the vent exits through the lower portion of the furnace casing. See Fig. 35 and Product Data Sheet for accessory listing. Refer to the Vent Guard Kit Instructions for complete details.
The horizontal portion of the venting system shall slope upwards not less

! CAUTION
CUT HAZARD Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing furnaces.

than 1/4-in. per linear ft. (21 mm/M) from the furnace to the vent and shall be rigidly supported every 5 ft. (2 M) or less with metal hangers or straps to ensure there is no movement after installation.
SIDEWALL VENTING
This furnace is not approved for direct sidewall horizontal venting.
Per section 12.4.3 of the current edition of NFPA54/ANSI Z223.1, any listed mechanical venter may be used, when approved by the authority having jurisdiction.

The vent connector can exit the furnace through one of 5 locations on the casing.

Select the listed mechanical venter to match the BTUh input of the furnace being vented. Follow all manufacturer’s installation requirements for venting and termination included with the listed

mechanical venter.

Caution!! For the following applications, use the minimum vertical vent heights as specified below. For all other applications, follow exclusively the National Fuel Gas Code.

FURNACE ORIENTATION

VENT ORIENTATION

FURNACE INPUT (BTUH/HR)

Downflow Horizontal Left Horizontal Left Horizontal Left
Downflow Downflow

Vent elbow left, then up Fig. 35 Vent elbow right, then up Fig. 43
Vent Elbow up Fig. 41 Vent elbow right Fig. 40 Vent elbow up then left Fig. 31 Vent elbow up, then right Fig. 38

154,000 132,000 110,000 154,000 132,000 154,000 132,000 154,000 110,000 110,000

*. 4 in. (102 mm) inside casing or vent guard . Including 4 in. (102 mm) vent section(s)
NOTE: All vent configurations must also meet National Fuel Gas Code venting requirements NFGC

MIN. VENT DIAMETER IN. (mm)*
5 (127) 5 (127) 5 (127) 5 (127) 5 (127) 5 (127)

MIN. VERTICAL VENT HEIGHT FT. (M) 12 (3.6) 7 (2.1) 7 (2.1) 7 (2.1) 10 (3.0) 10 (3.0)

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 21

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Fig. 31 ­ Downflow Application-Vent Elbow Up then Left A03210

Fig. 35 ­ Downflow Application-Vent Elbow Left then Up A03207

Fig. 36 ­ Horizontal Left Application-Vent Elbow Left A03213

Fig. 32 ­ Upflow Application-Vent Elbow Right

A03209

Fig. 33 ­ Horizontal Right Application-Vent Elbow Left A02068

Fig. 37 ­ Upflow Application-Vent Elbow Up

A03208

Fig. 34 ­ Downflow Application-Vent Elbow Up

A03211

Fig. 38 ­ Downflow Application-Vent Elbow Up then RightA03212

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 22

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Fig. 39 ­ Horizontal Right Application-Vent Elbow Right A03218 Fig. 40 ­ Horizontal Left Application-Vent Elbow Right A03216
Fig. 41 ­ Horizontal Left Application-Vent Elbow Up A03215

Venting notes for Fig. 31 – Fig. 43
1. For common vent, vent connector sizing and vent material: United States- use the NFGC.
2. Immediately increase to 5-inch (127 mm) or 6-inch (152 mm) vent connector outside furnace casing when 5-inch (127 mm) vent connector is required, refer to Note 1 above.
3. Side outlet vent for upflow and downflow installations must use Type B vent immediately after exiting the furnace, except when factory-authorized, Downflow Vent Guard Kit, is used in the downflow position. See Product Data Sheet for accessory listing.
4. Type-B vent where required, refer to Note 1 above.
5. Four-inch single-wall (26 ga. min.) vent must be used inside furnace casing and when the Downflow Vent Guard Kit is used external to the furnace. See Product Data Sheet for accessory listing.
6. Factory-authorized accessory Downflow Vent Guard Kit required in downflow installations with lower vent configuration. See Product Data Sheet for accessory listing.
7. Chimney Adapter Kit may be required for exterior masonry chimney applications. Refer to Chimney Adapter Kit for sizing and complete application details. See Product Data Sheet for accessory listing.
8. Secure vent connector to furnace elbow with (2) corrosion-resistant sheet metal screws, spaced approximately 180° apart.
9. Secure all other single wall vent connector joints with (3) corrosion resistant screws spaced approximately 120° apart. Secure Type-B vent connectors per vent connector manufacturer’s recommendations.

A03219
Fig. 42 ­ Horizontal Right Application-Vent Elbow Left then Up
A03214
Fig. 43 ­ Horizontal Left Application-Vent Elbow Right then Up
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 23

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

AIR DELIVERY – CFM

Unit Size 045M14–12 045M17–14 070M14–12

Airflow Setting
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Table 9 ­ Air Delivery – CFM (with filter)*

Default Setting Constant Fan Heating
Cooling Constant Fan
Heating
Cooling Constant Fan
Heating Cooling

External Static Pressure (in. w.c.)

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

1

455 385 320 250 175

—

—

—

—

—

490 425 360 300 225 150

—

—

—

—

535 480 415 360 305 230 160

—

—

—

565 510 450 395 345 285 215 135

—

—

605 555 500 445 390 345 285 215 145

—

645 595 545 490 440 395 350 290 225 155

695 645 600 550 500 455 410 370 310 255

715 670 625 575 530 485 440 400 355 290

770 730 685 640 595 555 510 470 430 390

825 780 740 700 660 615 575 535 500 460

870 830 795 755 720 680 640 600 560 525

920 880 845 810 775 735 700 660 625 590

965 930 895 855 825 790 755 720 685 650

1005 970 935 905 875 840 805 770 740 705

1055 1020 990 960 930 895 865 835 800 770

1105 1070 1040 1010 980 950 925 895 860 830

1125 1095 1065 1035 1005 975 950 920 890 860

1210 1180 1150 1120 1095 1065 1040 1010 980 945

495 425 345 270 210 135

—

—

—

—

540 475 400 330 270 205 135

—

—

—

580 520 455 380 320 260 200 160

—

—

635 575 520 450 385 330 275 215 155

—

685 630 570 515 450 390 340 290 235 180

720 665 615 560 505 445 395 345 295 245

770 720 665 615 565 505 450 400 355 310

830 785 735 690 640 590 535 485 440 395

880 840 790 745 705 660 610 555 510 465

945 905 860 815 775 735 690 645 595 550

1005 965 920 880 840 800 760 725 680 630

1060 1025 985 940 905 865 825 790 750 710

1120 1085 1050 1010 970 935 900 865 830 795

1170 1135 1100 1065 1030 995 960 925 890 855

1235 1205 1170 1135 1100 1065 1035 1000 965 915

1295 1265 1235 1200 1170 1135 1105 1075 1020 930

1365 1335 1305 1270 1240 1210 1180 1125 1035 930

1460 1420 1375 1330 1285 1235 1190 1130 1035 930

465 400 330 250 180 115

—

—

—

—

500 440 370 295 225 165 115

–

—

—

550 490 430 365 300 235 175 130 —

—

595 540 485 425 355 295 240 185 135

—

635 580 530 475 420 355 300 245 195 145

675 625 575 525 470 410 355 300 250 205

715 670 625 575 525 475 420 370 320 270

760 720 675 630 585 535 490 435 390 340

805 765 725 685 640 595 550 505 455 410

855 820 780 740 700 660 615 575 530 485

905 870 835 795 760 720 685 645 600 560

950 915 880 845 810 775 740 700 665 625

1005 970 940 905 870 840 805 770 735 700

1055 1020 990 960 930 895 865 830 800 765

1085 1055 1025 995 965 935 900 870 840 810

1120 1090 1060 1030 1000 970 940 910 880 850

1150 1120 1095 1065 1035 1005 975 945 920 890

1220 1195 1170 1140 1115 1090 1060 1035 1005 970

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 24

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Unit Size 070M17–12 070M17–16 070M21–16

Airflow Setting
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Table 9 ­ Air Delivery – CFM (with filter)* (Continued)

Default Setting Constant Fan
Heating Cooling Constant Fan
Heating Cooling Constant Fan
Heating
Cooling

0.1 475 515 565 610 655 700 740 790 835 880 935 985 1035 1080 1120 1175 1225 1300 545 605 665 740 810 870 955 1025 1095 1175 1220 1320 1390 1475 1550 1630 1705 1840 590 665 730 820 875 950 1045 1140 1200 1300 1370 1455 1535 1615 1705 1775 1870 2025

0.2 385 430 490 540 590 635 685 735 785 830 890 940 990 1040 1075 1140 1190 1265 465 535 595 675 750 815 900 975 1050 1135 1180 1285 1355 1435 1520 1600 1675 1810 495 580 655 750 810 885 985 1085 1145 1250 1320 1410 1490 1575 1670 1745 1840 1975

External Static Pressure (in. w.c.)

0.3 0.4 0.5 0.6 0.7 0.8

300 220 155

–

—

—

350 275 200 130

—

—

410 340 270 205 140

—

470 400 335 265 210 150

525 455 395 330 270 215

570 505 445 385 325 270

620 560 500 445 390 335

675 620 565 510 455 400

730 675 620 570 515 465

780 725 675 625 575 525

840 790 740 690 645 595

895 845 800 750 705 665

950 900 855 810 770 730

995 950 910 865 825 785

1035 995 950 910 870 830

1100 1060 1020 980 940 905

1155 1115 1080 1040 1000 965

1230 1190 1160 1120 1085 1050

385 310 235 155

—

—

455 385 315 250 175

–

530 460 395 330 270 205

615 550 490 430 370 315

690 635 570 515 460 405

760 705 650 595 545 490

850 795 745 695 645 595

925 880 835 785 735 685

1005 955 915 870 820 770

1090 1045 1005 960 920 875

1135 1095 1055 1015 975 935

1245 1205 1170 1130 1095 1055

1315 1280 1245 1210 1170 1135

1405 1370 1335 1300 1265 1235

1485 1450 1415 1385 1350 1320

1570 1540 1510 1480 1450 1420

1640 1615 1590 1560 1535 1505

1775 1735 1700 1660 1620 1580

390 290 210 120

—

—

485 390 300 225 145

–

565 480 385 310 245 170

675 595 520 435 360 300

740 665 595 515 435 370

830 760 695 625 550 480

930 875 810 750 685 620

1030 980 925 865 810 750

1095 1050 1000 945 885 835

1195 1155 1110 1065 1015 960

1275 1230 1190 1150 1105 1055

1365 1325 1285 1245 1205 1165

1450 1415 1375 1340 1305 1265

1535 1495 1460 1425 1390 1355

1635 1600 1565 1535 1505 1470

1710 1680 1650 1620 1590 1560

1810 1780 1750 1725 1705 1670

1925 1875 1820 1770 1725 1680

0.9 —-155 220 280 350 415 480 550 620 685 745 790 865 930 1015 —255 355 440 545 645 730 830 890 1015 1100 1200 1290 1390 1480 1540 —235 315 410 555 695 780 910 1005 1115 1225 1320 1435 1530 1630 1630

1 —–165 235 300 365 430 505 575 640 705 750 830 895 980 —190 305 390 495 595 685 790 850 980 1065 1165 1260 1365 1455 1500 —165 250 360 490 635 730 865 960 1070 1185 1285 1400 1505 1530 1535

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 25

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Unit Size 090M17–14 090M21–16 090M21–20

Airflow Setting
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Table 9 ­ Air Delivery – CFM (with filter)* (Continued)

Default Setting Constant Fan
Heating Cooling Constant Fan
Heating Cooling Constant Fan
Heating Cooling

0.1 670 705 760 810 860 910 950 1025 1075 1140 1210 1255 1280 1340 1410 1475 1550 1620 685 745 810 860 915 980 1040 1100 1170 1225 1295 1315 1350 1420 1495 1565 1645 1725 770 850 925 1030 1120 1210 1285 1385 1480 1570 1675 1775 1865 1965 2075 2170 2270 2485

0.2 595 635 695 750 800 855 900 975 1030 1095 1165 1210 1235 1300 1370 1440 1515 1585 585 660 725 785 845 910 980 1040 1110 1170 1245 1265 1300 1375 1455 1525 1605 1680 655 745 825 940 1040 1130 1215 1320 1415 1510 1615 1720 1815 1920 2030 2135 2225 2445

External Static Pressure (in. w.c.)

0.3 0.4 0.5 0.6 0.7 0.8 485 405 330 245 190 130

535 450 380 305 235 180

625 520 450 380 310 245

685 585 515 450 385 320

745 675 580 510 450 390

800 740 650 580 515 460

850 790 730 640 575 515

925 875 820 740 670 615

985 935 885 835 745 690

1050 1005 960 910 855 775

1125 1085 1040 995 950 895

1170 1130 1085 1045 1000 955

1200 1160 1115 1075 1030 990

1265 1225 1185 1145 1105 1065

1335 1300 1265 1225 1190 1150

1405 1370 1335 1300 1265 1225

1480 1445 1415 1380 1345 1310

1555 1520 1490 1460 1425 1375

490 395 315 240 170

—

560 480 390 320 250 185

635 550 475 395 325 265

700 615 540 465 395 335

765 680 610 535 465 400

840 765 690 620 555 490

910 840 770 700 635 575

975 910 840 770 710 650

1055 995 930 870 800 745

1110 1055 995 930 865 810

1195 1135 1085 1025 970 905

1215 1160 1110 1055 1000 935

1250 1195 1145 1090 1035 975

1330 1280 1230 1185 1130 1075

1405 1360 1315 1270 1220 1170

1480 1435 1395 1350 1305 1260

1565 1525 1480 1435 1390 1345

1645 1605 1565 1520 1480 1420

540 430 325 195

—

—

640 535 435 340 210

–

725 625 530 435 345 230

845 755 665 575 490 405

950 865 780 700 615 540

1050 970 895 810 735 655

1140 1065 990 915 840 765

1250 1180 1110 1040 975 900

1355 1290 1215 1155 1090 1025

1450 1390 1325 1260 1200 1140

1560 1505 1450 1390 1330 1270

1670 1615 1560 1510 1450 1395

1765 1715 1660 1610 1555 1500

1875 1825 1780 1730 1680 1630

1985 1940 1895 1845 1805 1760

2090 2050 2005 1965 1925 1880

2190 2150 2115 2075 2035 2000

2410 2365 2315 2265 2215 2160

0.9 -125 195 260 325 400 465 560 630 715 815 880 925 1025 1110 1190 1270 1315 –200 275 345 425 510 590 685 755 850 880 915 1020 1120 1210 1300 1340 —315 455 580 690 835 960 1080 1210 1340 1450 1580 1710 1835 1960 2105

1 –145 210 270 345 410 510 580 665 760 820 855 965 1070 1150 1235 1255 —215 285 370 450 530 630 700 795 830 865 960 1060 1160 1250 1260 —185 380 510 620 765 895 1015 1155 1285 1395 1535 1660 1790 1920 2050

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 26

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Table 9 ­ Air Delivery – CFM (with filter)* (Continued)

Unit Size 110M21–20 110M24–20 135M24–20

Airflow Setting
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Default Setting Constant Fan
Heating Cooling Constant Fan
Heating Cooling Constant Fan
Heating Cooling

0.1 845 920 1025 1115 1235 1340 1440 1530 1640 1745 1835 1895 1950 2055 2160 2260 2355 2520 840 930 1015 1095 1185 1250 1335 1435 1510 1600 1685 1760 1855 1945 2025 2055 2125 2220 760 815 905 975 1025 1120 1205 1285 1380 1450 1555 1635 1710 1785 1870 1940 2020 2125

0.2 730 810 920 1015 1150 1260 1365 1460 1575 1685 1780 1840 1895 2005 2110 2210 2310 2480 725 825 915 995 1090 1160 1255 1355 1435 1530 1615 1695 1795 1885 1970 2000 2070 2170 635 700 795 870 920 1025 1120 1200 1305 1380 1480 1565 1645 1725 1805 1885 1965 2075

External Static Pressure (in. w.c.)

0.3 0.4 0.5 0.6 0.7 0.8 625 520 420 330 240 135

705 610 515 425 345 260

825 735 645 560 475 400

930 840 760 675 595 520

1060 980 900 825 750 675

1180 1100 1025 955 885 810

1290 1215 1140 1070 1005 940

1390 1320 1250 1185 1115 1055

1510 1440 1375 1310 1250 1190

1620 1555 1495 1430 1370 1315

1720 1665 1605 1550 1490 1435

1785 1730 1675 1615 1560 1505

1840 1785 1725 1670 1615 1565

1955 1900 1845 1790 1740 1690

2065 2015 1960 1910 1860 1815

2165 2120 2070 2020 1975 1930

2265 2225 2180 2135 2090 2045

2435 2395 2350 2310 2255 2195

615 505 400 310 215 135

720 620 520 420 335 250

815 725 630 530 440 360

905 815 725 635 540 460

1005 915 835 750 665 580

1080 1000 915 840 755 675

1175 1100 1020 940 870 790

1280 1210 1140 1060 990 920

1360 1290 1225 1155 1085 1015

1455 1390 1325 1260 1190 1125

1545 1480 1420 1360 1295 1230

1630 1565 1505 1450 1390 1330

1730 1670 1610 1560 1505 1445

1830 1770 1710 1655 1605 1555

1915 1855 1800 1750 1700 1650

1945 1890 1835 1785 1735 1685

2015 1965 1910 1860 1815 1765

2115 2060 2005 1960 1905 1860

520 405 290 175

—

—

590 485 370 270 155

—

685 590 490 380 290 185

770 680 590 490 395 310

825 740 655 560 460 375

935 845 770 690 600 505

1030 945 870 800 720 635

1120 1040 965 900 830 750

1225 1150 1075 1010 950 885

1305 1230 1160 1095 1030 975

1415 1345 1275 1210 1150 1095

1500 1435 1370 1310 1245 1190

1585 1525 1460 1400 1340 1285

1665 1600 1545 1485 1425 1375

1750 1695 1640 1580 1525 1475

1830 1780 1725 1675 1620 1570

1915 1865 1815 1765 1715 1665

2025 1975 1925 1875 1825 1775

0.9 -155 320 445 600 740 875 995 1130 1260 1380 1455 1510 1640 1765 1885 2005 2135 -165 280 385 500 595 710 845 950 1060 1165 1270 1385 1495 1600 1635 1720 1810 —205 290 420 550 675 815 910 1045 1140 1230 1320 1420 1520 1620 1705

1 –245 380 525 675 805 930 1075 1205 1330 1400 1460 1590 1720 1840 1960 2080 –205 310 430 525 635 780 880 995 1110 1210 1330 1445 1550 1585 1670 1750 —-195 350 470 590 735 840 985 1090 1185 1275 1375 1475 1580 1640

NOTE:
1.A filter is required for each return-air inlet. Airflow performance included 3/4-in. (19 mm) washable filter media such as contained in a factory – authorized accessory filter rack. See accessory list. To determine airflow performance without this filter, assume an additional 0.1 in. w.c. available external static pressure.
2.Adjust the blower airflow setting as necessary for the proper air temperature rise for each installation. 3.Airflows over 1800 CFM require bottom return, two-side return, or bottom and side return. A minimum filter size of 20″ x 25″ (508 x 635 mm) is required. 4.For upflow applications, air entering from one side into both the side of the furnace and a return air base counts as a side and bottom return 5..The — entry indicates unstable operating conditions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 27

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Unit Size 045M14–12 045M17–14 070M14–12 070M17–12 070M17–16 070M21–16 090M17–14 090M21–16 090M24–20 110M21–20 110M24–20 135M24–20

Table 10 ­ Airflow Settings

Default Airflow Settings*

Heating

Cooling

8

18

6

18

15

18

15

18

12

18

10

18

12

18

13

18

11

18

12

16

15

18

15

18

Designated Airflow Settings

Heating

Constant Fan

(4-12)

(1-7)

(4-12)

(1-7)

(9-16)

(1-7)

(11-17)

(1-8)

(7-13)

(1-4)

(6-14)

(1-8)

(7-16)

(1-9)

(8-16)

(1-6)

(7-16)

(1-10)

(8-15)

(1-9)

(9-17)

(1-6)

(12-16)

(1-7)

*. Setting #1 is the default setting for Constant Fan
FURNACE CONTROL PROGRAMMING AND NAVIGATION On-Board Control Method
! CAUTION
ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury, or death. Blower access door switch removes 115-V power to control. No component operation can occur unless switch is closed. Caution must be taken when manually closing this switch for service purposes. Do not tape or permanently allow the door switch to be bypassed. Temporarily depress the door switch with one hand while accessing the service buttons with your other hand. Do not touch uninsulated electrical components.

This furnace model is equipped with an on-board 3-digit LCD display with pushbutton navigation for the adjustment of operating parameters, diagnostics, and service. The control board must be powered to use the display and pushbuttons. Upon startup, the control will alternate displaying the Model Program Number (PRG) and Software Version (uEr). The control board has been programmed at the factory with a Model Program Number specific to the furnace product number. The correct Model Program Number is shown on the furnace rating plate.
The system’s status is displayed after startup or after no control buttons have been pressed for 60 seconds. Status Code LED will also be illuminated or blinking when displaying the system status. The codes which indicate the current operating mode of the system as shown in Table 11.

Display iDl Ht CL Hpd Cfn
bLr

.

Table 11 ­ System Status Display Codes

Operating Mode Idle/Standby Mode

Notes No active demands

Heating Mode

Gas Heating active

Cooling Mode

Cooling or Heat Pump active

Heat Pump Defrost Mode Gas Heating cycle active during Heat Pump Defrost cycle

Continuous Fan Mode
Secondary Unit Operating Blower
Active Status Code

Continuous Fan active
Only used when control is the secondary furnace of a twinned furnace system and primary furnace is active See Fig. 45 or Furnace Service Label for codes

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 28

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Table 12 ­ Main Menu Options

Display FLt
Ht CL Cfn HoD Cod dir tnn
inF
Ct rSt

Operating Mode

Use

Faults code menu stores the 7 latest faults in memory. If no faults, None (non) will be

Last 7 faults that occurred displayed. To clear fault history, scroll to Clear (Clr) and press MENU/SELECT. See

Fig. 45 or Furnace Service Label for codes.

Heating blower speed

Heating Airflow Setting. Adjust higher to lower Temp. Rise; lower to increase Temp. Rise. See Start-Up Procedures. See Fig. 44 for allowable selections and Table 9 for airflows.

Cooling and Heat Pump blower Cooling Airflow Setting. See Fig. 44 for allowable selections and Table 9 for airflows.

speed

Refer to cooling or heat pump equipment data for required airflow settings.

Constant Fan blower speed

Constant Fan Airflow Setting. See Fig. 44 for allowable selections and Table 9 for airflows.

Heat OFF Delay

Value shown in seconds. Shorter delays may leave unused heat in ducts. Longer delays may blow cold air at the end of heating demands.

Cool OFF Delay

Value shown in seconds. Shorter delays may leave unused energy in furnace coil. Longer delays may re-evaporate condensate.

Direction

Adjusts display orientation 180 degrees between up flow (UPF) and down flow (dnF).

Twinning

Primary (Pri) or Secondary (SEC) furnace selection. Adjust only if furnace is used in a twinned furnace system. Use of accessory kit required. See kit instructions.

Do NOT program the control board with a Model Program Number different than what is

Program # and Software specified on the rating plate. Alternates displaying the saved Model Program Number

(pRG) and Software Version (uEr).

Component Test

Use to validate components are functioning as intended. See Component Self- Test instructions in the Start-Up Procedures section.

Reset

Reset settings to Factory Default by selecting Yes (YEs).

The Main Menu provides access to operating parameters of the furnace control including airflows as well as other diagnostics. See Fig. 28 for the location of the pushbuttons. Scroll through Main Menu by pressing MENU/SELECT button. Press NEXT/OPTION to display the current setting of the parameter (value will flash). Additional presses will scroll through setting options. Press MENU/SELECT button to save a new setting and return to the Main Menu. The display will flash three times to confirm a new setting selection has been saved. Fig. 44 shows the flow of the menu and settings. Table 12 provides additional information on parameter adjustment and applicability.
NFC and Supported App Method

! CAUTION
FURNACE OVERHEATING HAZARD Failure to follow this caution could result in reduced furnace life. Do NOT program the control board with a Model Program Number different than what is specified on the rating plate. Parameter options will not match design values.

This furnace control board is also equipped with NFC (Near Field Communication) technology which allows the adjustment of operating parameters, diagnostics, and service via a field-supplied mobile device with NFC capability and supported mobile app. Remove 115-V power from the furnace control board to use this method. See Fig. 28 for the location of the NFC antenna. Additional instructions and help may be available through the supported mobile app.
Scan the mobile app QR Code on page 1 of this manual for more information and a link to download the mobile app.
Control Board Replacement

If the control board must be replaced, the new board must be programmed with the correct Model Program Number before the furnace will operate. Do NOT program the control board with a Model Program Number different than what is specified on the rating plate. The control may be programmed by either of these approved methods:
1. Use the supported mobile app to flash the model program onto the board using Near Field Communication (NFC). Scan the QR code on page 1 of this manual for more information and a link to download the mobile app.

2. Use the correct Super Plug (available from distributor / replacement component) for the control board to copy the correct model program onto the new board.
Further details and instructions for these programming methods are provided with the replacement control board.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 29

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

SERVICE LABEL

Fig. 44 ­ 3 Digit Display Flow Chart

A220518

Fig. 45 ­ Service Label
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 30

A210786

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

START-UP, ADJUSTMENT, AND SAFETY CHECK GENERAL
! WARNING
FIRE HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. This furnace is equipped with manual reset limit switches in the gas control area. The switches open and shut off power to the gas valve if a flame rollout or overheating condition occurs in the gas control area. DO NOT bypass the switches. Correct inadequate combustion air supply problem before resetting the switches.
1. Maintain 115-V wiring and ground. Improper polarity will result in rapid flashing control diagnostic light and Status code (10.1) is displayed. The furnace will NOT operate.
2. Make thermostat wire connections at the 24-V terminal block on the furnace control. Failure to make proper connections will result in improper operation (see Fig. 24).
3. Gas supply pressure to the furnace must be greater than 4.5-in. w.c. (0.16 psig) but not exceed 14-in. w.c. (0.5 psig).
4. Check all manual-reset switches for continuity. 5. Install blower compartment door. Door must be in place to operate
furnace. 6. Replace outer door.
! CAUTION
CUT HAZARD Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing furnaces.
Start-Up Procedures
! WARNING

1. Purge gas lines after all connections have been made. 2. Check gas lines for leaks.
! WARNING
ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury, or death. Blower access door switch opens 115-V power to control. No component operation can occur unless switch is closed. Caution must be taken. Do not touch uninsulated electrical components when manually closing this switch. for service purposes.
3. To Begin Component Self-Test a. Remove thermostat wire connected to R terminal on control to ensure no thermostat demands are present. b. Temporarily depress blower door switch to power the control board.
! CAUTION
SHOCK HAZARD Failure to follow this caution could result in personal injury. Do not tape or permanently allow the door switch to be bypassed. Temporarily depress the door switch with one hand while accessing the service buttons with your other hand. Do not touch uninsulated electrical components.
c. To initiate the component test sequence, the control must be in (idL) mode. no thermostat demands (W, Y, G). Select component test (Ct) from menu select buttons to start the component test sequence. Once initiated the furnace control will perform the test sequence as shown in Table 13. Once complete, connect thermostat wire to R terminal on control board and re-install blower door.
4. Operate furnace per instruction on door. 5. Verify furnace shut down by lowering thermostat setting below
room temperature. 6. Verify furnace restarts by raising thermostat setting above room
temperature.

FIRE AND EXPLOSION HAZARD Failure to follow this warning could cause personal injury, death and/or property damage.
Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections.

Display tSt PUr HSi Fn
End
Err

Operating Mode Test Purge
Hot Surface Igniter Fan
End Test
Error

Table 13 ­ Test Sequence
Function Confirms start of Component Test mode.
Inducer ON for 10 seconds before next stage. Inducer remains ON for test duration.
Hot Surface Igniter ON for 15 seconds, then OFF.
Blower ON at 50% torque for 10 seconds, then OFF. All component OFF except for Inducer for 10 seconds. Display returns to iDl. If a thermostat input is detected or fault condition activates during the test sequence, control will abort and display End for 6 seconds. Displayed if component test is not able start. Check for thermostat inputs or faults, and system status is Idle (iDl).

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 31

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions
WIRING DIAGRAM

Fig. 46 ­ Wiring Diagram
Adjustments
Furnace gas input rate on rating plate is for installations at altitudes up to 2000 ft. (610 M). Furnace input rate must be within +/-2 percent of furnace rating plate input.

A210787

! WARNING
FIRE HAZARD Failure to follow this warning could result in injury, death and/or property damage. DO NOT bottom out gas valve regulator adjusting screw. This can result in unregulated manifold pressure and result in excess overfire and heat exchanger failures.
1. Determine the correct gas input rate. The input rating for altitudes above 2,000 ft. (610 M) must be reduced by 4 percent for each 1,000 ft. (305 M) above sea level. For installations below 2000 ft. (610 M), refer to the unit rating plate. For installations above 2000 ft. (610 M), multiply the input on the rating plate by the de-rate multiplier in Table 14 for the correct input rate.
! CAUTION
FURNACE DAMAGE HAZARD Failure to follow this caution may result in reduced furnace life. DO NOT redrill orifices. Improper drilling (burrs, out-of-round holes, etc.) can cause excessive burner noise and misdirection of burner flames. This can result in flame impingement of heat exchangers, causing failures (see Fig. 47).

Fig. 47 ­ Orifice Hole Table 14 ­ Altitude Derate Multiplier for U.S.A.

A93059

ALTITUDE (FT. / M)

PERCENT OF
DERATE

DERATE MULTIPLIER
FACTOR*

0­2000 (0-610)

0

1.00

2001­3000 (610-914)

8­12

0.90

3001­4000 (914-1219)

12­16

0.86

4001­5000 (1219-1524)

16­20

0.82

5001­6000 (1524-1829)

20­24

0.78

6001­7000 (1829-2134)

24­28

0.74

7001­8000 (2134-2438)

28­32

0.70

8001­9000 (2438-2743)

32­36

0.66

9001­10,000 (2743-3048)

36­40

0.62

*. Derate multiplier factors are based on midpoint altitude for altitude range

2. Determine the correct orifice and manifold pressure adjustment. There are two different orifice and manifold adjustment tables. All models in all positions, except Low NOx models in downflow or horizontal positions, use Table 16 (22,000 BTUh/Burner).

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 32

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Low NOx models in the downflow or horizontal positions must use Table 17 (21,000 BTUh/Burner). See input listed on rating plate. a. Obtain average yearly gas heat value (at installed altitude) from
local gas supplier. b. Obtain average yearly gas specific gravity from local gas
supplier. c. Find installation altitude in Table 16 or Table 17. d. Find closest natural gas heat value and specific gravity in
Table 16 or Table 17. e. Follow heat value and specific gravity lines to point of
intersection to find orifice size and manifold pressure settings for proper operation. f. Check and verify burner orifice size in furnace. NEVER ASSUME ORIFICE SIZE. ALWAYS CHECK AND VERIFY.
NOTE: If orifice hole appears damaged or it is suspected to have been redrilled, check orifice hole with a numbered drill bit of correct size. Never redrill an orifice. A burr-free and squarely aligned orifice hole is essential for proper flame characteristics.
g. Replace orifice with correct size if required by Table 14, Table 16, Table 17 and Table 15. Use only factory-supplied orifices. See EXAMPLE 1.
EXAMPLE 1: (0 to 2000 ft. (0 to 610 M) altitude)
For 22,000 BTUh per burner application use Table 16.
Heating value = 1000 BTUh/cu ft.
Specific gravity = 0.62
Therefore: Orifice No. 43
Manifold pressure: 3.7-In. W.C.
Furnace is shipped with No. 43 orifices. In this example all main burner orifices are the correct
size and do not need to be changed to obtain proper input rate.
3. Adjust manifold pressure to obtain correct input rate. a. Turn gas valve ON/OFF switch to OFF. b. Remove manifold pressure tap plug from gas valve (see Fig. 21). c. Connect a water column manometer or similar device to manifold pressure tap. d. Turn gas valve ON/OFF switch to ON. e. Manually close blower door switch. f. Set thermostat to call for heat. g. Remove regulator seal cap and turn regulator adjusting screw counterclockwise (out) to decrease input rate of clockwise (in) to increase input rate.
NOTE: DO NOT set manifold pressure less than 3.2-in. w.c. or more than 3.8-in. w.c. for natural gas at sea level. If manifold pressure is outside this range, change main burner orifices. Refer to Table 14, Table 16, Table 17 and Table 15.
h. Install regulator seal cap. i. Leave manometer or similar device connected and proceed to
Step 4.
4. Verify natural gas input rate by clocking meter.
NOTE: Gas valve regulator adjustment cap must be in place for proper input to be clocked.
a. Turn off all other gas appliances and pilots served by the meter. b. Run furnace for 3 minutes in heating operation. c. Measure time (in sec) for gas meter to complete 1 revolution and
note reading. The 2 or 5 cubic feet dial provides a more accurate measurement of gas flow. d. Refer to Table 16 for cubic ft. of gas per hr. e. Multiply gas rate (cu ft./hr) by heating value (BTUh/cu ft.) to obtain input. f. If clocked rate does not match required input from Step 1, increase manifold pressure to increase input or decrease manifold pressure to decrease input. Repeat steps b through e until correct input is achieved. Reinstall regulator seal cap on gas valve.

Table 15 ­ Gas Rate (Cu Ft./Hr.)

SECONDS FOR 1
REVOLUTION
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

SIZE OF TEST DIAL
1 Cu 2 Cu 5 Cu Ft. Ft. Ft. 360 720 1800 327 655 1636 300 600 1500 277 555 1385 257 514 1286 240 480 1200 225 450 1125 212 424 1059 200 400 1000 189 379 947 180 360 900 171 343 857 164 327 818 157 313 783 150 300 750 144 288 720 138 277 692 133 267 667 129 257 643 124 248 621 120 240 600 116 232 581 113 225 563 109 218 545 106 212 529 103 206 514 100 200 500 97 195 486 95 189 474 92 185 462 90 180 450 88 176 439 86 172 429 84 167 419 82 164 409 80 160 400 78 157 391 76 153 383 75 150 375 73 147 367

SECONDS FOR 1
REVOLUTION
50 51 52 53 54 55 56 57 58 59 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 112 116 120

SIZE OF TEST DIAL
1 Cu 2 Cu 5 Cu Ft. Ft. Ft. 72 144 360 71 141 355 69 138 346 68 136 340 67 133 333 65 131 327 64 129 321 63 126 316 62 124 310 61 122 305 60 120 300 58 116 290 56 112 281 54 109 273 53 106 265 51 103 257 50 100 250 48 97 243 47 95 237 46 92 231 45 90 225 44 88 220 43 86 214 42 84 209 41 82 205 40 80 200 39 78 196 38 76 192 38 75 188 37 74 184 36 72 180 35 71 178 35 69 173 34 68 170 33 67 167 33 65 164 32 64 161 31 62 155 30 60 150

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 33

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

Table 16 ­ Orifice Size* and Manifold Pressure (in. w.c.) for Gas Input Rate

Table 17 ­ Orifice Size* And Manifold Pressure (in. w.c.) for Gas Input Rate

A10180

A10181

A10180A

Adjust Temperature Rise

A10181A

5. Set temperature rise. The furnace must operate within the temperature rise ranges specified on the furnace rating plate. Do not exceed temperature rise range specified on unit rating plate. Determine the temperature rise as follows:

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 34

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

! CAUTION
FURNACE DAMAGE HAZARD Failure to follow this caution may result in:
– Overheating the heat exchangers or condensing flue gases in heat exchanger areas not designed for condensate.
– Shortened furnace life – Component damage. Temperature rise must be within limits specified on furnace rating plate. Recommended operation is at midpoint of rise range or slightly above.
NOTE: Blower access door must be installed when taking temperature rise reading. Leaving blower access door off will result in incorrect temperature measurements.
a. Place thermometers in return and supply ducts as close to furnace as possible. Be sure thermometers do not see radiant heat from heat exchangers. Radiant heat affects temperature rise readings. This practice is particularly important with straight-run ducts.
b. When thermometer readings stabilize, subtract return-air temperature from supply-air temperature to determine air temperature rise.
NOTE: If the temperature rise is outside this range, first check: (1.) Gas input for heating operation. (2.) Derate for altitude if applicable. (3.) Return and supply ducts for excessive restrictions causing static pressures greater than 0.50-in. w.c.
! WARNING
ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Blower access door switch opens 115-V power to control. No component operation can occur unless switch is closed. Caution must be taken when manually closing this switch.
c. Adjust air temperature rise by adjusting blower speed. Increase blower speed to reduce temperature rise. Decrease blower speed to increase temperature rise
d. Turn thermostat down below room temperature and remove blower access door.
e. Refer to the FURNACE CONTROL PROGRAMMING AND NAVIGATION section of this manual for instructions on adjusting the blower speed.
f. Repeat steps a through e until termperature rise is within range on rating plate.
g. When correct input rate and temperature rise is achieved, turn gas valve ON/OFF switch to OFF.
! WARNING
FIRE HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Reinstall manifold pressure tap plug in gas valve to prevent gas leak.
h. Remove manometer or similar device from gas valve. i. Reinstall manifold pressure tap plug in gas valve.

! WARNING
FURNACE OVERHEATING HAZARD Failure to follow this caution may result in reduced furnace life.
Recheck temperature rise. It must be within limits specified on the rating plate. Recommended operation is at the mid-point of rise range or slightly above.
6. Adjust heating blower-OFF delay. The blower-OFF delay has four adjustable settings from 90 sec to 180 sec. Refer to the FURNACE CONTROL PROGRAMMING AND NAVIGATION section of this manual for instructions. Factory off delay setting is 120 sec.
7. Set airflow CFM for cooling. See Table 9-Air Delivery-CFM (with filter).
8. Adjust cooling blower-OFF dealy. Refer to the FURNACE CONTROL PROGRAMMING AND NAVIGATION section of this manual for instructions.
Check Safety Controls
The flame sensor, gas valve, and pressure switch were all checked in the Start-up procedure section as part of normal operation.
1. Check Main Limit Switch(es) This control shuts off combustion control system and energizes air-circulating blower motor, if furnace overheats. By using this method to check limit control, it can be established that limit is functioning properly and will operate if there is a restricted duct system or motor failure. If limit control does not function during this test, cause must be determined and corrected. a. Run furnace for at least 5 minutes. b. Gradually block off return air with a piece of cardboard or sheet metal until the limit trips. c. Unblock return air to permit normal circulation. d. Burners will re-light when furnace cools down.
2. Check draft safeguard switch. The purpose of this control is to cause the safe shutdown of the furnace during certain blocked vent conditions. a. Verify vent pipe is cool to the touch. b. Disconnect power to furnace and remove vent connector from furnace vent elbow. c. Restore power to furnace and set room thermostat above room temperature. d. After normal start-up, allow furnace to operate for 2 minutes, then block vent elbow in furnace 80 percent of vent area with a piece of flat sheet metal. e. Furnace should cycle off within 2 minutes. If gas does not shut off within 2 minutes, determine reason draft safeguard switch did not function properly and correct condition. f. Remove blockage from furnace vent elbow. g. Switch will auto-reset when it cools. h. Re-install vent connector.
NOTE: Should switch remain open longer than 3 minutes, furnace control board will lockout the furnace for 3 hours. To reset furnace control board, turn thermostat below room temperature or from HEAT to OFF and turn 115-V power OFF, then back ON.
3. Check Pressure Switch This control proves operation of the draft inducer blower. a. Turn off 115-V power to furnace. b. Disconnect inducer motor lead wires from wire harness. c. Turn on 115-V power to furnace. d. Set thermostat to “call for heat” and wait 1 minute. When pressure switch is functioning properly, hot surface igniter should NOT glow and control diagnostic light flashes a status

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 35

58SC0B/58SC1B: Installation, Start­Up, Operating and Service and Maintenance Instructions

code (31.1). If hot surface igniter glows when inducer motor is disconnected, shut down furnace immediately. e. Determine reason pressure switch did not function properly and correct condition. f. Turn off 115-V power to furnace. g. Reconnect inducer motor wires, replace outer door, and turn on 115-V power. h. Blower will run for 90 sec before beginning the call for heat again. i. Furnace should ignite normally. Checklist · Put away tools and instruments. Clean up debris. · Check Input/Output gas pressure · Check heat rise per application static pressure · Cooling CFM per application static pressure · Verify that blower-OFF delay time is selected as desired. · Verify that blower and burner access doors a

References

• 58SC0/1 Airflow
• Home - American Gas Association
• Dashboard | My Learning Center
• NFPA | The National Fire Protection Association
• 58SC0/1 Airflow
• Kidde Fire Safety Products and Education | Kidde

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