MODINE PTX175AS0121 Gas Fired Unit Heater Instruction Manual

MODINE PTX175AS0121 Gas Fired Unit Heater

Specifications

• Model: PTX and BTX
• Unit Type: Gas-fired unit heaters
• Approval: Approved for use in California by the CEC and in Massachusetts
• Certification: Certified for non-residential applications

Product Usage Instructions

Installation

1. Inspect unit upon arrival. In case of damage, report it immediately to the transportation company and your local Modine sales representative.
2. Check the rating plate on the unit to verify that the power supply meets the available electric power at the point of installation.
3. Ensure that the unit conforms to the description of the product ordered, including specifications where applicable.

Special Precautions
The installation and maintenance instructions in this manual must be followed to provide safe, efficient, and trouble-free operation. In addition, particular care must be exercised regarding the special precautions listed below. Failure to properly address these critical areas could result in property damage or loss, personal injury, or death. These instructions are subject to any more restrictive local or national codes.

Hazard Intensity Levels
DANGER: Indicates an imminently hazardous situation which, if not avoided, WILL result in death or serious injury.

For Your Safety
The use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous.

Important Warnings

1. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death, and could cause exposure to substances which have been determined by various state agencies to cause cancer, birth defects, or other reproductive harm. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.
2. Do not locate ANY gas-fired units in areas where chlorinated, halogenated, or acidic vapors are present in the atmosphere. These substances can cause premature heat exchanger failure due to corrosion, which can cause property damage, serious injury, or death.

What to Do If You Smell Gas

1. Open windows.
2. Do not try to light any appliance.
3. Do not touch any electrical switch; do not use any phone in your building.
4. Extinguish any open flame.
5. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions. If you cannot reach your gas supplier, call your fire department.

Unit Location
Ensure that the gas-fired unit is not located in areas where chlorinated, halogenated, or acidic vapors are present in the atmosphere to prevent premature heat exchanger failure due to corrosion. This can cause property damage, serious injury, or death.

Inspection on Arrival

1. Inspect unit upon arrival. In case of damage, report it immediately to the transportation company and your local Modine sales representative.
2. Check the rating plate on the unit to verify that the power supply meets the available electric power at the point of installation.
3. Inspect unit upon arrival for conformance with the description of the product ordered (including specifications where applicable).

Before You Begin
The use of this manual is specifically intended for a qualified installation and service agency. All installation and service of these units must be performed by a qualified installation and service agency.

This Manual’s Ownership
This manual is the property of the owner. Please be sure to leave it with the owner when you leave the job.

FAQ

1. Q: Can I install the gas-fired unit heater myself?
   A: No, all installation and service of these units must be performed by a qualified installation and service agency.

2. Q: What should I do if I smell gas?
   A: Follow the steps provided in the “What to Do If You Smell Gas” section of the manual.

3. Q: Can the gas-fired unit heater be located in areas with certain vapors?
   A: No, the unit should not be located in areas where chlorinated, halogenated, or acidic vapors are present in the atmosphere to prevent corrosion and potential hazards.

INSTALLATION AND SERVICE MANUAL gas-fired unit heaters model PTX and BTX
All models approved for use in California by the CEC and in Massachusetts. Unit heater is certified for non-residential applications.

FOR YOUR SAFETY
The use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous.

WARNING

1. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death, and could cause exposure to substances which have been determined by various state agencies to cause cancer, birth defects, or other reproductive harm. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.
2. Do not locate ANY gas-fired units in areas where chlorinated, halogenated, or acidic vapors are present in the atmosphere. These substances can cause premature heat exchanger failure due to corrosion, which can cause property damage, serious injury, or death.

IMPORTANT
The use of this manual is specifically intended for a qualified installation and service agency. All installation and service of these units must be performed by a qualified installation and service agency.

Inspection on Arrival

1. Inspect unit upon arrival. In case of damage, report it immediately to transportation company and your local Modine sales representative.
2. Check rating plate on unit to verify that power supply meets available electric power at the point of installation.
3. Inspect unit upon arrival for conformance with description of product ordered (including specifications where applicable).

FOR YOUR SAFETY

WHAT TO DO IF YOU SMELL GAS:

1. Open windows.
2. Do not try to light any appliance.
3. Do not touch any electrical switch; do not use any phone in your building.
4. Extinguish any open flame.
5. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions. If you can not reach your gas supplier, call your fire department.

THIS MANUAL IS THE PROPERTY OF THE OWNER.
PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.

SPECIAL PRECAUTIONS
THE INSTALLATION AND MAINTENANCE INSTRUCTIONS IN THIS MANUAL MUST BE FOLLOWED TO PROVIDE SAFE, EFFICIENT AND TROUBLE-FREE OPERATION. IN ADDITION, PARTICULAR CARE MUST BE EXERCISED REGARDING THE SPECIAL PRECAUTIONS LISTED BELOW. FAILURE TO PROPERLY ADDRESS THESE CRITICAL AREAS COULD RESULT IN PROPERTY DAMAGE OR LOSS, PERSONAL INJURY, OR DEATH. THESE INSTRUCTIONS ARE SUBJECT TO ANY MORE RESTRICTIVE LOCAL OR NATIONAL CODES.

HAZARD INTENSITY LEVELS

1. DANGER: Indicates an imminently hazardous situation which, if not avoided, WILL result in death or serious injury.
2. WARNING: Indicates a potentially hazardous situation which, if not avoided, COULD result in death or serious injury.
3. CAUTION: Indicates a potentially hazardous situation which, if not avoided, MAY result in minor or moderate injury.
4. IMPORTANT: Indicates a situation which, if not avoided, MAY result in a potential safety concern.

DANGER
Appliances must not be installed where they may be exposed to a potentially explosive or flammable atmosphere.

WARNING

1. Gas fired heating equipment must be vented – do not operate unvented.

2. A built-in power exhauster is provided – additional external power exhausters are not required or permitted.

3. If an existing heater is being replaced, it may be necessary to resize the venting systems. Improperly sized venting systems can result in vent gas leakage or the formation of condensate. Refer to the National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA B149.1 – latest edition. Failure to follow these instructions can result in injury or death.

4. Under no circumstances should two sections of double wall vent pipe be joined together within one horizontal vent system due to the inability to verify complete seal of inner pipes.

5. All field gas piping must be pressure/leak tested prior to operation. Never use an open flame. Use a soap solution or equivalent for testing.

6. Gas pressure to appliance controls must never exceed 14″ W.C. (1/2 psi).

7.  To reduce the opportunity for condensation, the minimum sea level input to the appliance, as indicated on the serial plate, must not be less than 5% below the rated input, or 5% below the minimum rated input of dual rated units.

8. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.

9. All appliances must be wired strictly in accordance with wiring diagram furnished with the appliance. Any wiring different from the wiring diagram could result in a hazard to persons and property.

10. Any original factory wiring that requires replacement must be replaced with wiring material having a temperature rating of at least 105°C.

11. Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% greater than the rated voltage.
    WARNING

12. When servicing or repairing this equipment, use only factory-approved service replacement parts. A complete replacements parts list may be obtained by contacting the factory. Refer to the rating plate on the appliance for complete appliance model number, serial number, and company address. Any substitution of parts or controls not approved by the factory will be at the owner’s risk.

CAUTION

1. All literature shipped with this unit should be kept for future use for servicing or service diagnostics. Do not discard any literature shipped with this unit.
2. Consult piping, electrical, and venting instructions in this manual before final installation.
3. Do not attach ductwork, air filters, or polytubes to any propeller unit heater.
4. Clearances to combustible materials are critical. Be sure to follow all listed requirements.
5. Heaters are designed for use in heating applications with ambient startup temperatures between -40°F and 90°F and ambient operating temperatures between 40°F and 90°F.
6. Do not install unit outdoors.
7. In garages or other sections of aircraft hangars such as offices and shops that communicate with areas used for servicing or storage, keep the bottom of the unit at least 7′ above the floor unless the unit is properly guarded to provide user protection from moving parts. In parking garages, the unit must be installed in accordance with the standard for parking structures ANSI/NFPA 88A – latest edition, and in repair garages the standard for repair garages NFPA 30A – latest edition. In Canada, installation of heaters in airplane hangars must be in accordance with the requirements of the enforcing authority, and in public garages in accordance with the current CSA-B149 codes.
8. In aircraft hangars, keep the bottom of the unit at least 10′ from the highest surface of the wings or engine enclosure of the highest aircraft housed in the hangars and in accordance with the requirements of the enforcing authority and/or NFPA 409 – latest edition (Formerly NFPA 88B).
9. Installation of units in high humidity or salt water atmospheres will cause accelerated corrosion, resulting in a reduction of the normal life of the units.
10. Do not install units below 7′ measured from the bottom of the unit to the floor in commercial applications (unless unit is properly guarded to provide user protection from moving parts).
11. Be sure no obstructions block air intake and discharge of unit heaters.
12.  The minimum distance from combustible material is based on the combustible material surface not exceeding 160°F. Clearance from the top of the unit may be required to be greater then the minimum specified if heat damage, other than fire, may occur to materials above the unit heater at the temperature described.
13. Allow 18″ of clearance at rear (or 12″ beyond end of motor at rear of unit, whichever is greater) and access side to provide ample air for proper operation of fan.
14. Installation must conform with local building codes or in the absence of local codes, the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada installation must be in accordance with CSA-B149.1.
15. The concentric vent adapter box must be installed inside of the structure or building. Do not install this box on the exterior of a building or structure.
16. Purging of air from gas supply line should be performed as described in the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada, installation must be in accordance with CSA-B149.1.
17. When leak testing the gas supply piping system, the appliance and its combination gas control must be isolated during any pressure testing in excess of 14″ W.C.(1/2 psi).
18. The unit should be isolated from the gas supply piping system by closing its field installed manual shut-off valve. This manual shut-off valve should be located within 6′ of the heater.
19. Turn off all gas before installing appliance.
20. Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not less than 5% below the rated voltage.
21. Check the gas inlet pressure at the unit upstream of the combination gas control. The inlet pressure should be 6- 7″ W.C. on natural gas or 11-14″ W.C. on propane. If inlet pressure is too high, install an additional pressure regulator upstream of the combination gas control.
22. Service or repair of this equipment must be performed by a qualified service agency.
23. Do not attempt to reuse any mechanical or electronic ignition controller which has been wet. Replace defective controller.

IMPORTANT

• To prevent premature heat exchanger failure, do not locate ANY gas-fired appliances in areas where corrosive vapors (i.e. chlorinated, halogenated, or acidic) are present in the atmosphere.
• To prevent premature heat exchanger failure, the input to the appliance as indicated on the serial plate must not exceed the rated input by more then 5%.
• To prevent premature heat exchanger failure, observe heat exchanger tubes. If the tubes become red while blower and furnace are in operation, check to be sure the blower has been set to the proper rpm for the application. Refer to page 19 for Blower Adjustments.
• Start-up and adjustment procedures should be performed by a qualified service agency.
• To check most of the Possible Remedies in the trouble- shooting guide listed in Table 30.1 refer to the applicable sections of the manual.

BEFORE YOU BEGIN

CAUTION

1. All literature shipped with this unit should be kept for future use for servicing or service diagnostics. Leave manual with the owner. Do not discard any literature shipped with this unit.
2. Consult piping, electrical, and venting instructions in this manual before final installation.
3. Do not attach ductwork, air filters, or polytubes to any propeller unit heater.

In the U.S., the installation of these units must comply with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition and other applicable local building codes. In Canada, the installation of these units must comply with local plumbing or waste water codes and other applicable codes and with the current code CSA-B149.1.

1. All installation and service of these units must be performed by a qualified installation and service agency only as defined in ANSI Z223.1 (NFPA 54) – latest edition or in Canada by a licensed gas fitter.
2. This unit is certified with the controls furnished. For replacements parts, please order according to the replacement parts list on serial plate. Always know your model and serial numbers. Modine reserves the right to substitute other authorized controls as replacements.
3. Unit is balanced for correct performance. Do not alter fan or operate motors at speeds below what is shown in this manual.
4. Information on controls is supplied separately.
5. The same burner is used for natural and propane gas.

SI (Metric) Conversion Factors

UNIT LOCATION

DANGER
Appliances must not be installed where they may be exposed to a potentially explosive or flammable atmosphere.

CAUTION

1. Clearances to combustible materials are critical. Be sure to follow all listed requirements.
2. Heaters are designed for use in heating applications with ambient startup temperatures between -40°F and 90°F, and ambient operating temperatures between 40°F and 90°F.
3. Do not install unit outdoors.
4.  In garages or other sections of aircraft hangars such as offices and shops that communicate with areas used for servicing or storage, keep the bottom of the unit at least 7′ above the floor unless the unit is properly guarded. In parking garages, the unit must be installed in accordance with the standard for parking structures ANSI/NFPA 88A -latest edition, and in repair garages the standard for repair garages NFPA 30A – latest edition (Formerly NFPA 88B). In Canada, installation of heaters in airplane hangars must be in accordance with the requirements of the enforcing authority, and in public garages in accordance with the current CSA-B149 codes.
5. In aircraft hangars, keep the bottom of the unit at least 10′ from the highest surface of the wings or engine enclosure of the highest aircraft housed in the hangars and in accordance with the requirements of the enforcing authority and/or NFPA 409 – latest edition.
6. Installation of units in high humidity or salt water atmospheres will cause accelerated corrosion resulting in a reduction of the normal life of the units.

IMPORTANT

Location Recommendations

1. When locating the heater, consider general space and heating requirements, availability of gas and electrical supply, and proximity to vent locations.

2. When locating units, it is important to consider that the combustion air and vent piping must be connected to the outside atmosphere. Vent terminals should be located adjacent to one another. Maximum equivalent vent lengths are listed in “Section A – General Instruction – All Units” of the Venting instructions.

3. Be sure the structural support at the unit location site is adequate to support the unit’s weight. Refer to pages 28-29 for unit weights. For proper operation the unit must be installed in a level horizontal position.

4. Do not install units in locations where the flue products can be drawn into the adjacent building openings such as windows, fresh air intakes, etc.

5. Be sure that the minimum clearances to combustible materials and recommended service clearances are maintained. Units are designed for installation with the minimum clearances as shown in Figure 4.1 and Table 4.1.
   Figure 4.1 – Combustible Material and Service Clearances

6. Do not install units in locations where gas ignition system is exposed to water spray, rain, or dripping water.

7. Mounting height (measured from bottom of unit) at which unit heaters are installed is critical. Refer to mounting height and heat throw data on page 26 of this manual. The maximum mounting height for any unit is that height above which the unit will not deliver heated air to the floor.

Table 4.1 – Clearances

Unit Side| Clearance To Combustible Materials| Recommended Service Clearance
---|---|---
Top and Bottom| 6″| 18″
Access Side| 6″| 18″
Non-Access Side| 6″| 18″
Rear| 18″| 18″
Vent Connector| 6″| 18″

Sound and Vibration Levels
All standard mechanical equipment generates some sound and vibration that may require attenuation. Libraries, private offices and hospital facilities will require more attenuation, and in such cases, an acoustical consultant may be retained to assist in the application. Locating the equipment away from the critical area is desirable within ducting limitations. Generally, a unit should be located within 15′ of a primary support beam. Smaller deflections typically result in reduced vibration and noise transmission.

UNIT MOUNTING

CAUTION

• Do not install units below 7′ measured from the bottom of the unit to the floor in commercial applications (unless unit is properly guarded to provide user protection from moving parts).
• Be sure no obstructions block air intake and discharge of unit heaters.
• The minimum distance from combustible material is based on the combustible material surface not exceeding 160°F. Clearance from the top of the unit may be required to be greater than the minimum specified if heat damage, other than fire, may occur to materials above the unit heater at the temperature described.
• Allow 18″ clearance at rear (or 12″ beyond end of motor at rear of unit, whichever is greater) and access side to provide ample air for proper operation of fan.

1. Be sure the means of suspension is adequate to support the weight of the unit (see pages 28-29 for unit weights).
2.  For proper operation, the unit must be installed in a level horizontal position.
3.  Clearances to combustibles as specified in Table 4.1 must be strictly maintained.
4.  All standard units are shipped fully boxed. Larger units are also supplied with skid supports on the bottom of the box. The larger units may be lifted from the bottom by means of a fork lift or other lifting device only if the shipping support skids are left in place and the forks support the whole depth of the unit. If the unit must be lifted from the bottom for final installation without the carton in place, be sure to properly support the unit over its entire length and width to prevent damage. When lifting units, make sure the load is balanced.
5. Propeller models have four mounting holes and blower models have 6 mounting holes. The units can be mounted with 3/8″-16 threaded rod as follows:
   • On each piece of threaded rod used, screw a nut a distance of about 1″ onto the end of the threaded rods that will be screwed into the unit heater.
   • Place a washer over the end of the threaded rod and screw the threaded rod into the unit heater weld nuts on the top of the heater at least 5 turns, and no more than 10 turns. Tighten the nut first installed onto the threaded rod to prevent the rod from turning.
   • Drill holes into a steel channel or angle iron at the same center-line dimensions as the heater that is being installed. The steel channels or angle iron pieces need to span and be fastened to appropriate structural members.
   • Cut the threaded rods to the preferred length, place them through the holes in the steel channel or angle iron and secure with washers and lock nuts or lock washers and nuts. A double nut arrangement can be used here instead of at the unit heater (a double nut can be used both places but is not necessary).
   • Do not install standard unit heaters above the maximum mounting height shown in Tables 26.1 or 26.2.

NOTE: A pipe hanger adapter kit, shown in Figure 5.1 is available as an accessory. One kit consists of drilled 3/4″ IPS pipe caps and 3/8″-16 x 1-1/2″ capscrews to facilitate threaded pipe suspension.

Figure 5.1 – Unit Heater Suspension Methods

INSTALLATION – VENTING

WARNING

1. Gas fired heating equipment must be vented – do not operate unvented.
2. A built-in power exhauster is provided – additional external power exhausters are not required or permitted.
3. If an existing heater is being replaced, it may be necessary to resize the venting systems. Improperly sized venting systems can result in vent gas leakage or the formation of condensate. Refer to the National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA B149.1 – latest edition. Failure to follow these instructions can result in serious injury or death.
4. Under no circumstances should two sections of double wall vent pipe be joined together within one horizontal vent system due to the inability to verify complete seal of inner pipes.

CAUTION
Installation must conform with local building codes or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada installation must be in accordance with CSA B149.1.

Model PTX/BTX unit heaters must be vented with the proper passageway as described in these instructions to convey flue gases from the unit or the vent connector to the outside atmosphere. The venting instructions are organized in sections, based on installation type. The sections are identified as follows:

Section

| Applicable Installation Instructions by Vent System Type|

Vent Type

---|---|---
A| General instruction for ALL installations| Both
B| VERTICAL CATEGORY I vent systems Q)| Vent Only
C| HORIZONTAL CATEGORY III vent systems Q)| Vent Only
D| Vertical 2-Pipe vent systems Q)| Combustion Air and Vent
E| Horizontal 2-Pipe vent system Q)| Combustion Air and Vent
F| HORIZONTAL AND VERTICAL CONCENTRIC vent systems Q)| Combustion Air and Vent

The differences between Vertical and Horizontal vent systems will be identified in “Section A – General Instructions – All Units”.

Section A – General Instructions – All Units

• A1. If the unit heater being installed is replacing existing equipment and using the existing vent system from that equipment, inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) or CSA B149.1 Installation Code – latest edition and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.

• A2. The vent pipe should be galvanized steel or other suitable corrosion resistant material. Follow the National Fuel Gas Code for minimum thickness of vent material. The minimum thickness for connectors varies depending on the pipe diameter. Do not vent unit with PVC or other forms of plastic venting material.

• A3. All heaters come with factory installed vent and combustion air adapters for attaching the vent pipe to the heater (see Table 6.1). Attach the vent pipe to the adapter with
  3-corrosion resistant screws. (Drill pilot holes through the vent pipe and adapter prior to screwing in place). Vent pipe much not be smaller than the connector size.

• A4. Refer to Table 6.1 for total equivalent vent pipe lengths, making the vent system as straight as possible. The equivalent length of a 90° elbow is 5 feet for 4 inch diameter and 7 feet for 6 inch diameter.

Table 6.1 – Vent Pipe Diameters, Transitions, and Total Equivalent Vent Pipe Lengths For 1 and 2 pipe Horizontal and Vertical Venting Systems

Vent

Only

| Combustion Air and Vent| Vent

Only

| Combustion Air and Vent
150| 4″| 3′| 5′| 50′| 25′
175- 200| 4″| 3′| 5′| 70′| 50′
250- 400| 6″| 3′| 5′| 70′| 50′

• A5. Horizontal sections of vent pipe are to be installed with an upward or downward slope from the appliance of 1/4 inch per foot and suspended securely from overhead structures at points not greater than 3′ apart.
• A6. Fasten individual lengths of vent together with at least three corrosion resistant sheet metal screws.
• A7. Keep single wall vent pipe at least 6″ from combustible materials. For double wall vent pipe, follow the vent pipe manufacturer’s clearances to combustibles. The minimum distance from combustible materials is based on the combustible material surface not exceeding 160°F. Clearance from the vent pipe (or the top of the unit) may be required to be greater than 6″ if heat damage other than fire could result (such as material distortion or discoloration).
• A8. Avoid venting through unheated space when possible. When venting does pass through an unheated space or if the unit is installed in an environment that promotes condensation, insulate runs greater than 5′ to minimize condensation. Inspect for leakage prior to insulating and use insulation that is noncombustible with a rating of not less than 400°F. Install a tee fitting at the low point of the vent system and provide a drip leg with a clean out cap as shown in Figure 9.1.

Figure 6.1 – Venting Through Combustible Roof or Wall

See Instruction A12 for attaching single wall pipe to double wall pipe.

• A9. When the vent passes through a combustible INTERIOR  wall or floor, a metal thimble 4″ greater than the vent diameter is necessary. If there is 6′ or more of vent pipe in the open space between the appliance and where the vent pipe passes through the wall or floor, the thimble need only be 2″ greater than the diameter of the vent pipe. If a thimble is not used, all combustible material must be cut away to provide 6″ of clearance. Where authorities have jurisdiction, Type B vent may be used for the last section of vent pipe to maintain clearance to combustibles while passing through wall or floor (see Figure 6.1). Any material used to close the opening must be noncombustible.
• A10. Seal all seams and joints of un-gasketed single wall pipe with metal tape or Silastic suitable for temperatures up to 400°F. Wrap the tape 2 full turns around the vent pipe. One continuous section of double wall vent pipe may be used within the vent system to pass through the wall to the listed vent cap. Refer to instruction A11 in “Section A – General Instructions – All Units” for attaching double wall pipe to single wall pipe.
• A11. The following are General Instructions for Double Wall (Type B)

Terminal Pipe Installation:

1. How to attach a single wall vent terminal to double wall (Type B) vent pipe:
2. Look for the “flow” arrow on the vent pipe.
3. Slide the vent terminal inside the exhaust end of the double wall vent pipe.
4. Drill 3 holes through the pipe and the vent terminal. Using 3/4″ long sheet metal screws, attach the cap to the pipe. Do not over tighten.
5. How to connect a single wall vent system to a double wall (Type B) vent pipe:
6. Slide the single wall pipe inside the inner wall of the double wall pipe.
7. Drill 3 holes through both walls of the single and double wall vent pipes. Using 3/4″ sheet metal screws, attach the 2 pieces of pipe. Do not overtighten.
8. The gap between the single and double wall pipe must be sealed but it is not necessary to fill the full volume of the annular area. To seal, run a large bead of 400°F silastic around the gap.

• A12. Vent termination clearances as shown in Table 7.1:
• A13. Do NOT vent this appliance into a masonry chimney.
• A14. Do NOT use dampers or other devices in the vent or combustion pipes.
• A15. The venting system must be exclusive to a single appliance and no other appliance is allowed to be vented into it.
• A16. Precautions must be taken to prevent degradation of building materials by flue products.
• A17. Single wall vent pipe must not pass through any unoccupied attic, inside wall, concealed space, or floor.
• A18. Uninsulated single wall vent pipe must not be used outdoors for venting appliances in regions where the 99% winter design temperature is below 32°F.
• A19. Long runs of horizontal or vertical combustion air pipes may require insulation in very cold climates to prevent the buildup of condensation on the outside of the pipe where the pipe passes through conditioned spaces.
• A20. Vertical combustion air pipes should be fitted with a tee with a drip leg and a clean out cap to prevent against the possibility of any moisture in the combustion air pipe from entering the unit. The drip leg should be inspected and cleaned out periodically during the heating season.
• A21. Vent terminals shown in Table 7.2 must be used:

Table 7.2 – Vent Terminals

Table 7.1 – Vent Termination Clearances

B149.1
4 feet below, 4 feet horizontal, or 1 foot above| Door window, gravity air inlet, or any building opening (US)| NFPA 54
3 feet in all directions| Door window, gravity air inlet, or any building opening (Canada)| CSA B149.1
3 feet horizontal CD| Electric meter, gas meter, gas regulator, and relief equipment| CSA B149.1
2 feet in all directions| Adjacent building, adjoining building, or parapet wall| Modine
7 feet in all directions| Adjacent public walkways| NFPA 54/CSA B149.1
1 foot above| Grade (ground level)| NFPA 54/CSA B149.1
1 foot below or 1 foot beyond| Eave with 24″ overhang or less| Modine
3 feet below or 1 foot beyond| Eave with greater than 24″ overhang| Modine

• A22. This unit may be installed with or without the combustion air intake pipe. Using the vent pipe only allows for greater maximum vent length but is not considered “separated combustion” because the combustion air comes from indoors. Using both a combustion air and vent pipe is considered “separated combustion” and requires a shorter maximum vent.
• A23. In addition to following these general instructions, specific instructions for vertical and horizontal vent systems in 1 pipe, 2 pipe or 2 pipe concentric vent configurations must also be followed. Table 8.1 outlines the differences:

Table 8.1 – ANSI Unit Heater Venting Requirements

# of pipes (horizontal/ vertical)| ****

Category

| ****

Description

| ****

Venting Requirements

---|---|---|---
Vertical Vent Pipe Only| I| Negative vent pressure Non-condensing| Follow standard venting requirements.
Not applicable to this product| II| Negative vent pressure Condensing| Condensate must be drained.
Horizontal Vent Only All two pipe systems| III| Positive vent pressure Non- condensing| Vent must be gas tight.
Not applicable to this product| IV| Positive vent pressure Condensing|

• Vent must be liquid and gas tight.
• Condensate must be drained.

Note: Vent connectors serving Category I appliances shall not be connected into any portion of mechanical draft systems operating under positive pressure.

Vertical Vent Only – Category I Vent Determination (Not Separated Combustion)

• Vertical vent systems terminate vertically (up) (an example is shown in Figure 9.1).
• The horizontal portion of the vent run cannot exceed 75%of the vertical rise (Example: If the vent height is 10′, the horizontal portion of the vent system cannot exceed 7.5′).
• The vent terminates a minimum of 5′ above the vent connector on the unit.
• If the vent system to be installed meets ALL these criteria, proceed to “Section B – Vertical Vent Only, Category I Vent System Venting Instructions”.

Horizontal Vent Only – Category III Determination (Not Separated Combustion)

• Horizontal vent systems terminate horizontally (sideways)(an example is shown in Figure 10.1).
• A vent system that terminates vertically but has a horizontal run that exceeds 75% of the vertical rise is considered horizontal.
• Horizontal vent configurations are Category III. Additional requirements are covered in “Section C – 1 Pipe Horizontal Category III Vent System Installation”.

If the vent system to be installed meets ALL these criteria, proceed to “Section C – Horizontal Vent Only, Category III Vent System Venting Instructions

Vertical Combustion Air and Vent – Category III Vent Determination (Separated Combustion)

• Vertical vent systems terminate vertically (up) (an example is shown in Figure 11.1).
• Determine the venting configuration as follows:
  • For two building penetrations through the wall or roof (one for the combustion air inlet pipe and one for the vent pipe), proceed to “Section D Vertical Combustion Air and Vent – Category III Vent Determination (Separated Combustion) Venting Instructions”.
  • For a single larger building penetration through the wall or roof, through which both the combustion air inlet and vent pipes will pass, proceed to “Section F -Horizontal or Vertical Combustion Air and Vent Systems using a Concentric Vent – Category III Vent System Determination (Separated Combustion)”.

Horizontal Combustion Air and Vent – Category III Vent System Determination (Separated Combustion)

• Horizontal vent systems terminate horizontally (sideways) (an example is shown in Figure 12.1).
• Determine the venting configuration as follows:
  • For 2 building penetrations through the wall or roof (1 for the combustion air inlet pipe and 1 for the vent pipe), proceed to “Section E – Horizontal Combustion Air and Vent – Category III Vent System Determination (Separated Combustion) Venting Instructions”.
  • For a single larger building penetration through the wall or roof, through which both the combustion air inlet and vent pipes will pass, proceed to “Section F -Horizontal or Vertical Combustion Air and Vent Systems using a Concentric Vent – Category III Vent System Determination (Separated Combustion)”.

Section B – Vertical Vent Only, Category I Vent System Venting Instructions

• B1. This section applies to vertically vented Category I vent systems and is in addition to “Section A – General Instructions – All Units”.
• B2. Vertical vent systems terminate vertically, and must be sized in accordance with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition.
• B3. The horizontal portion of the vent run cannot exceed 75% of the vertical rise (Example: If the vent height is 10′, the horizontal portion of the vent system cannot exceed 7.5′).
• B4. It is recommended to install a tee with drip leg and clean out cap as shown in Figure 9.1.
• B5. The vent terminates a minimum of 5′ above the vent connector on the unit.
• B6. All vertically vented heaters that are Category I must be connected to a vent complying with a recognized standard, with a material acceptable to the authority having jurisdiction. Venting into a masonry chimney is not permitted. Refer to the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition for instructions on common venting.
• B7. Use a listed vent terminal to reduce down drafts and moisture in the vent.
• B8. Double wall vent pipe is recommended, although single wall can be used if the requirements of the National Fuel Gas Code are followed.
• B9. Vertical vents must terminate a minimum horizontal and vertical distance from roof lines and adjacent walls or obstructions. These minimum distances are outlined as follows (based on National Fuel Gas Code requirements for vents with diameters less than 12″):
• For double wall vent pipe and 8′ or greater horizontal distance to any vertical wall or similar obstruction, the vent must terminate above the roof in accordance with Figure 9.1 and Table 9.1.
• For double wall vent pipe and less than 8′ horizontal distance to any vertical wall or similar obstruction, the vent must terminate at least 2′ above the highest point where it passes through a roof of a building and at least 2′ higher than any portion of a building within a horizontal distance of 10′ (see Figure 9.1).
• For single wall vent pipe and 10′ or greater horizontal distance to any portion of a building, the vent must terminate at least 2′ above the highest point where it passes through a roof of a building and at least 2′ higher than any portion of a building within a horizontal distance of 10′.
• For single wall vent pipe and less than 10′ horizontal distance to any portion of a building, the vent must terminate at least 2′ higher than any portion of that building.

Table 9.1 – Minimum Height from Roof to Lowest Discharge Opening

j Size according to expected snow depth.
Figure 9.1 – Vertical Category I Vent System

Section C – Horizontal Vent Only, Category III Vent System Venting Instructions

• C1. This section applies to horizontally vented Category III vent systems and is in addition to “Section A – General Instructions – All units”.
• C2. Horizontal vent systems terminate horizontally (sideways). C3. Seal all seams and joints of un-gasketed single wall pipe with metal tape or Silastic suitable for temperatures up to 400°F. Wrap the tape 2 full turns around the vent pipe. For single wall vent systems, 1 continuous section of double wall vent pipe may be used within the vent system to pass through the wall to a listed vent cap. Under no circumstances should 2 sections of double wall vent pipe be joined together within 1 horizontal vent system due to the inability to verify complete seal of inner pipes. Category III vent systems listed by a nationally recognized agency and matching the diameters specified may be used. Different brands of vent pipe materials may not be intermixed. Refer to instruction A10 in “Section A – General Instructions – All Units” for attaching double wall pipe to single wall pipe.
• C4. All horizontal Category III vents must be terminated with a listed vent cap. The cap must terminate a minimum distance of 12″ beyond the exterior wall surface as shown in Figure 10.1. The vent must be supported as shown in Figure 10.1. Precautions must be taken to prevent degradation of building materials by flue products.
• C5. When condensation may be a problem, the vent system shall not terminate over public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be detrimental to the operation of regulators, relief openings, or other equipment.
• C6. The venting system must be exclusive to a single unit, and no other unit is allowed to be vented into it.
• C7. When vented horizontally, maintain a 1/4″ per foot rise away from the heater and place a drip leg with clean out near the unit as shown in Figure 10.2. Where local authorities have jurisdiction, a 1/4″ per foot downward slope is acceptable with a drip leg and clean out near the exit of the vent as shown in Figure 10.2, or allow the condensate to drip out the end.
• C8. For a vent termination located under an eave, the distance of the overhang must not exceed 24″. The clearance to combustibles above the exterior vent must be maintained at a minimum of 12″. Consult the National Fuel Gas Code for additional requirements for eaves that have ventilation openings.
• C9. Once venting is complete, proceed to the section titled “Installation – Gas Connections”.

Figure 10.1 – Vent Construction Through Combustible Walls and Support Bracket

Figure 10.2 – 1 Pipe Horizontal Venting

Section D – Vertical Combustion Air and Vent – Category III Vent (Separated Combustion) Venting Instructions

• D1. This section applies to vertically vented 2-pipe (1 combustion air inlet pipe and 1 vent pipe) vent systems and is in addition to “Section A – General Instructions – All Units”.
• D2. Vertical vent systems terminate vertically (up).
• D3. It is recommended to install a tee with drip leg and clean out cap as shown in Figure 11.1.
• D4. The combustion air and vent pipes must be terminated with 2 listed vent caps.
• D5. Vertical vents must terminate a minimum horizontal and vertical distance from roof lines and adjacent walls or obstructions. These minimum distances are outlined in Figure 11.1 and Table 11.1.
• D6. The vent must terminate at least 1′ above and 6″ horizontally from the combustion air inlet.
• D7. Once venting is complete, proceed to section titled, “Installation – Gas Connections”.

Table 11.1 – Minimum Height from Roof to Lowest Discharge Opening

Size according to expected snow depth.

Figure 11.1 – Vertical 2-Pipe Vent System

Section E – Horizontal Combustion Air and Vent – Category III Vent System Determination
(Separated Combustion) Venting Instructions

• E1. This section applies to horizontally vented 2-pipe vent systems (1 combustion air inlet pipe and 1 vent pipe) and is in addition to “Section A – General Instructions – All Units”. Category III vent systems listed by a nationally recognized agency and matching the diameters specified may be used. Different brands of vent pipe materials may not be intermixed. Under no circumstances should two sections of double wall vent pipe be joined together within one horizontal vent system due to the inability to verify complete seal of inner pipes.
• E2. Horizontal vent systems terminate horizontally (sideways).
• E3. All horizontal vents must be terminated with a listed vent cap. The cap must terminate a minimum distance from the external wall, as summarized in Figure 12.1.
• E4. The termination of horizontally vented system must extend 16″ beyond the exterior surface of an exterior wall.
• E5. The combustion air pipe must be a minimum of 6″ below the vent pipe, and 4″ from the exterior wall.
• E6. Construct the vent system as shown in Figure 12.1.
• Figure 12.1 – Horizontal Venting with Downward Pitch E7. When horizontal vents pass through a combustible wall (up to 22″ thick), the vent passage must be constructed and insulated as shown in Figure 12,2.
• E8. The vent must be supported as shown in Figure 12.2.
• Figure 12.2 – Vent Construction Through Combustible Walls and Support Bracket E9. When condensation may be a problem, the vent system  shall not terminate over public walkways or over an area where condensate or vapor could create a nuisance or hazard, or could be detrimental to the operation of regulators, relief openings, or other equipment.
• E10. Maintain a 1/4″ per foot downward slope away from the heater and place a drip leg with clean out near the exit of the vent as shown in Figure 12.2, or allow the condensate to drip out the end.
• E11. For a vent termination located under an eave, the distance  of the overhang must not exceed 24″. The clearance to combustibles above the exterior vent must be maintained at a minimum of 12″. Consult the National Fuel Gas Code for additional requirements for eaves that have ventilation openings.
• E12. Once venting is complete, proceed to section titled “Installation – Gas Connections”.

CAUTION
The concentric vent adapter box must be installed inside of the structure or building. Do not install this box on the exterior of a building or structure.

Section F – Horizontal or Vertical Combustion Air and Vent Systems using a Concentric Vent – Category III Vent System Determination (Separated Combustion)

• F1. This section applies to both horizontally and vertically vented concentric vent systems as defined in “Section A – General Instructions – All Units”, and is in addition to the instructions in that section.
• F2. When utilizing the concentric vent option, it should have been predetermined whether the appliance will be horizontally or vertically vented. Before proceeding, verify that the concentric vent kit received contains the correct components for the installation:

For Vertical 2 Pipe Vented Units (Refer to Figure 13.1):

• Concentric adapter assembly (same for horizontal and vertical kits)
• Standard listed vent cap
• Specially designed inlet terminal

For Horizontal 2 Pipe Vented Units (Refer to Figure 13.2):

• Concentric adapter assembly (same for horizontal and vertical kits)
• Special vent termination cap
• Special air intake guard

Figure 13.1 – Vertical Concentric Vent Kit Components

• Figure 13.2 – Horizontal Concentric Vent Kit Components

•  F3. Once the kit contents have been verified as correct for the  direction of venting, the concentric vent adapter box is to installed. Determine the location of the box. Be sure to maintain all clearances as listed in these instructions.

• F4. The adapter box is to be mounted on the interior side of the building. It must not be mounted outside the building. The adapter box has integral mounting holes for ease of installation.

• F5. The adapter box can be mounted flush to the wall (for horizontal kits) or to the ceiling (for vertical kits). The box can also be offset from the wall or ceiling by using field supplied brackets. When mounting the box, consider serviceability and access to the vent and combustion air pipes. If the box is to be mounted using field supplied brackets, these brackets must be strong enough to rigidly secure the box to the wall or ceiling, and should be made from corrosion resistant material.

• F6. Determine the length of the vent pipe and combustion air inlet pipe for the selected location. THE VENT PIPE WILL PASS THROUGH THE CONCENTRIC VENT BOX. THE LAST SECTION OF VENT PIPE IS A CONTINUOUS LENGTH OF DOUBLE WALL “B” VENT. See section A11 for attaching and terminating double wall pipe. Begin with pipe lengths on the concentric pipe side of the concentric vent kit, referring to Figure 14.1. These pipes will extend through the building wall or roof as well as any added length for the thickness of the wall and the offset from any field installed brackets.

• For Vertical Concentric Vent Kits (Refer to Figure 13.1):

  • The bottom of the combustion air intake pipe must terminate above the snow line, or at least 12″ above the roof, whichever distance is greater.
  • The bottom of the vent cap must terminate at least 6″ above the top of the combustion air intake cap.

• For Horizontal Concentric Vent Kits (Refer to Figure 13.2):

  • The combustion air intake pipe must terminate at least 1″ from the wall to prevent water from running down the wall and into the pipe.
  • The back of the vent cap must terminate at least 14″ from the combustion air intake pipe.

• F7. Cut the concentric side vent and combustion air pipes to the proper length as determined in the previous step. See Table 14.1 for combustion air and vent pipe sizes. The pipes must be single wall galvanized or stainless steel material, except for the last section of vent pipe, which must be one continuous length of double wall B-vent extended through the concentric vent box and combustion air inlet pipe on the concentric side of the box.

  • NOTE – No clearance to combustible material is required
    for the building penetration, which should be sized according to the external combustion air Inlet pipe diameter.

• F8. Allow the concentric side vent pipe to pass through the concentric vent adapter box, as shown in Figure 14.1. Attach the double wall vent pipe to the single wall vent pipe that goes to the unit. Be sure to seal the joint and the open area around the double wall vent. Seal all joints and seams using sealant suitable for temperatures up to 400°F.

• F9. Slide the combustion air pipe over the vent pipe and attach to the air inlet of the concentric adapter box, as shown in Figure 14.1, using at least 3 corrosion-resistant sheet metal screws. Seal the joint and seam using sealant suitable for temperatures up to 400°F.

• F10. Place this assembly (the adapter box, vent pipe and combustion air pipe) through the wall or roof and verify that the distance requirements as defined in Step F7 are met. Securely attach the assembly to the building.

• F11. From outside the building, caulk the gap between the combustion air intake pipe and the building penetration.

• F12. Attach the combustion air intake and vent pipe terminations as follows:

Figure 14.1 – Concentic Vent kit with Combustion Air Intake Pipe Attached

For Vertical Concentric Vent Kits (Refer to Figure 13.1):

• Slide the combustion air cap down over the vent pipe and fasten it to the combustion air pipe with at least 3 corrosion-resistant sheet metal screws.
• Attach the vent cap to the vent pipe using at least 3 corrosion-resistant sheet metal screws. Refer to instruction A11 for connecting terminal to double wall pipe.
• Caulk the gap between the combustion air cap and the vent pipe with silicone sealant, or other appropriate sealants suitable for metal to metal contact and for temperatures up to 400° F.

For Horizontal Concentric Vent Kits (Refer to Figure 13.2):

1. Attach the combustion air intake guard using corrosion- resistant screws at the end of the combustion air intake pipe to prevent animals and debris from entering.
2. Attach the vent cap to the vent pipe using at least 3 corrosion-resistant sheet metal screws.

• F13. Install vent pipe and combustion air pipe between unit heater and concentric vent adapter box as outlined in “Section A – General Instructions – All Units”.
• F14. Once venting is complete, proceed to the section titled “Installation – Gas Connections”.

Table 14.1 – Concentric Vent Pipe Sizes

| Single Wall Pipe| Type B Vent Pipe G)
---|---|---
Model Size| Combustion Air (To Unit)| Combustion Air (External)| Vent (Pass-Through)
150- 200| 4″| 6″| 4″
250- 400| 6″| 8″| 6″

B-Vent must have 1/4″ air gap (OD is 1/2″ larger than ID).

Figure 14.2 – Concentric Vent Kit Exploded Assembly

GAS CONNECTIONS

WARNING

1. All field gas piping must be pressure/leak tested prior to operation. Never use an open flame. Use a soap solution or equivalent for testing.
2. Gas pressure to appliance controls must never exceed 14″ W.C. (1/2 psi).
3. To reduce the opportunity for condensation, the minimum sea level input to the appliance, as indicated on the serial plate, must not be less than 5% below the rated input, or 5% below the minimum rated input of dual rated units.

CAUTION

1. Purging of air from gas lines should be performed as described in the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition or in Canada CSA-B149 codes.

2. When leak testing the gas supply piping system, the appliance and its combination gas control must be isolated during any pressure testing in excess of 14″ W.C. (1/2 psi).

3. The unit should be isolated from the gas supply piping system by closing its field installed manual shut-off
   valve. This manual shut-off valve should be located within 6′ of the heater.

4.  Turn off all gas before installing appliance.

IMPORTANT
To prevent premature heat exchanger failure, the input to the appliance, as indicated on the serial plate, must not exceed the rated input by more than 5%.

1. Installation of piping must conform with local building codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest Edition. In Canada, installation must be in accordance with CSA-B149.1.
2. Piping to units should conform with local and national requirements for type and volume of gas handled, and pressure drop allowed in the line. Refer to Table 15.1 to determine the cubic feet per hour (CFH) for the type of gas and size of unit to be installed. Using this CFH value and the length of pipe necessary, determine the pipe diameter from Table 15.2. Where several units are served by the same main, the total capacity, CFH and length of main must be considered. Avoid pipe sizes smaller than 1/2″. Table 15.2 allows for a 0.3″ W.C. pressure drop in the supply pressure from the building main to the unit. The inlet pressure to the unit must be 6-7″ W.C. for natural gas and 11-14″ W.C. for propane gas. When sizing the inlet gas pipe diameter, make sure that the unit supply pressure can be met after the 0.3″ W.C. has been subtracted. If the 0.3″ W.C. pressure drop is too high, refer to the Gas Engineer’s Handbook for other gas pipe capacities.
3. Install a ground joint union with brass seat and a manual shut-off valve adjacent to the unit for emergency shut-off and easy servicing of controls, including a 1/8″ NPT plugged tapping accessible for test gauge connection (see Figure 15.1).
4. Use 2 wrenches when connecting field piping to units.
5. Provide a sediment trap before each unit in the line where low spots cannot be avoided (see Figure 15.1).
6. When pressure/leak testing, pressures above 14″ W.C. (1/2 psi), close the field installed shut-off valve, disconnect the appliance and its combination gas control from the gas supply line, and plug the supply line before testing. When testing pressures 14″ W.C. (1/2 psi) or below, close the manual shut-off valve on the appliance before testing.

Figure 15.1 – Recommended Sediment Trap/Manual Shut-off Valve Installation – Side or Bottom Gas Connection  Manual shut-off valve is in the “OFF” position when handle is perpendicular to pipe.

Table 15.1 – Sea Level Manifold Pressure & Gas Consumption

| Natural| Propane|
---|---|---|---
Model Size| Manifold Pressure (“W.C.):| 3.5| 10| # of Orifices
150| CFH| 142.9| 60| 6
Gal/Hr. Propane| n/a| 1.6
Orifice Drill Size| 42| 53
175| CFH| 166.7| 70| 7
Gal/Hr. Propane| n/a| 1.9
Orifice Drill Size| 42| 53
200| CFH| 190.5| 80| 7
Gal/Hr. Propane| n/a| 2.2
Orifice Drill Size| 38| 52
250| CFH| 238.1| 100| 9
Gal/Hr. Propane| n/a| 2.7
Orifice Drill Size| 39| 1.55 mm
300| CFH| 285.7| 120| 9
Gal/Hr. Propane| n/a| 3.3
Orifice Drill Size| 36| 51

350

| CFH| 333.3| 140| 12
Gal/Hr. Propane| n/a| 3.8
Orifice Drill Size| 38| 52
400| CFH| 381| 160| 12
Gal/Hr. Propane| n/a| 4.4
Orifice Drill Size| 36| 51

Table 15.2 – Gas Pipe Capacities – Natural Gas ➀ ‚

1. Capacities in cubic feet per hour through schedule 40 pipe with maximum
2. 0.3″ W.C. pressure drop with up to 14″ W.C. gas pressure. Specific gravity is 0.60 for natural gas and 1.50 for propane gas.
3. For pipe capacity with propane gas, divide natural gas capacity by 1.6. Example: What is the propane gas pipe capacity for 60 feet of 1-1/4″ pipe? The natural gas capacity is 400
4. CFH. Divide by 1.6 to get 250 CFH for propane gas.

INSTALLATION – HIGH ALTITUDE ACCESSORY KIT

HIGH ALTITUDE ACCESSORY KIT

• Modine’s gas-fired equipment standard input ratings are certified by ETL. For elevations above 2,000′, ANSI Z223.1 requires ratings be reduced 4 percent for each 1000′ above sea level. For units in Canada, CSA requires that ratings be reduced 10 percent at elevations above 2,000′. The high altitude adjustment instructions and pressure switch kits listed in this manual are for use with units that will be installed over 2,000′. These methods and kits comply with both ANSI Z223.1 and CSA requirements.
• If a unit is to be installed at higher elevations AND converted from natural gas to propane gas operation, a propane conversion kit must be used in conjunction with the pressure adjustment methods and pressure switch kits listed herein. For the selection and installation instructions for propane conversion kits, please see the latest revision of Modine Manual 75-515.

Selection of the Proper Pressure and Kit

• To determine the proper manifold pressure at altitude and if required, the proper combustion air pressure switch kit, the full model number of the heater, the fuel to be used, and the altitude the unit will be installed at must be known. Refer to the unit serial plate or carton label to obtain the necessary information about the unit.
• After obtaining this information, refer to the gas pressure and selection charts shown in Tables 16.1 through 17.1. The pressure charts are differentiated by elevation, fuel type, and country the product is being installed in. The selection charts are differentiated by product type, altitude and fuel type. If converting from natural gas to propane gas and operation at high altitude, both a propane conversion kit and a pressure switch kit must be used (if applicable). Selection charts include the proper kit suffix, when required.

Table 16.1 – Natural Gas Heating Values at Altitude ➀ ➂ ➃

1. Values shown are for 3.5″ W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 17.1 to calculate manifold pressure.
2. Values shown are for 10.0″ W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 17.1 to calculate manifold pressure.
3. When installed at altitudes above 2,000′, a pressure switch may need to be changed. Refer to Table 17.1 to determine if a switch change is required.
4. Gas heating values are derated 4% per 1,000′ of elevation in the USA and 10% between 2,000′ and 4,500′ elevation in Canada in accordance with ANSI Z223.1 and CSA-B149, respectively.

Manifold Pressure Adjustment

• The inlet pressure to the unit must be confirmed to be within acceptable limits (6-7″ W.C. for natural gas and 11-14″ W.C. for propane gas) before opening the shutoff valve or the combination gas valve may be damaged.
• Heaters for use with natural gas have gas valves that need to be field set at 3.5” W.C. manifold pressure at 7.0” W.C. inlet pressure.
• Units for use with propane gas need to be field set for 10.0” W.C. manifold pressure at 14.0” W.C. inlet pressure.
• Installation above 2,000′ elevation requires adjustment of the manifold pressure as described.

Derated BTU Content Gas and Manifold Pressure Calculation

• Some utility companies may derate the BTU content (heating value) of the gas provided at altitude to a value other than 1,050 BTU/ft3 for natural gas or 2,500 BTU/ft3 for propane gas to allow certain heating appliances to be used with no manifold pressure adjustments. For this reason it is necessary that the supplying utility be contacted for detailed information about the gas type and BTU content (heating value) before operating any heater. Tables 16.1 and 16.2 show the standard derated heating values (4% per 1,000′ of elevation in the USA and 10% between 2,001′ and 4,500′ elevation in Canada) of natural and propane gases at various altitudes. If the utility is supplying gas with heating values as shown in Tables 16.1 and 16.2, the manifold pressure should be set to 3.5″ W.C for natural gas and 10.0″ W.C. for propane gas.
• NOTE: Only the high fire gas pressure need be adjusted, low fire gas pressure should remain the same.

Table 16.2 – Propane Gas Heating Values at Altitude ➁ ➂ ➃

2,250

3,001-4,000| 2,123
4,001-4,500| 2,080
4,501-5,000| 2,038| 2,038
5,001-6,000| 1,957| 1,957
6,001-7,000| 1,879| 1,879
7,001-8,000| 1,803| 1,803
8,001-9,000| 1,731| 1,731
9,001-10,000| 1,662| 1,662
10,001-11,000| 1,596| 1,596
11,001- 12,000| 1,532| 1,532
12,001-13,000| 1,471| 1,471
13,001-14,000| 1,412| 1,412

• If the heating value of the gas being supplied is different than the values shown in Tables 16.1 and 16.2, use the following equation to determine the appropriate manifold pressure for the altitude and gas heating value being supplied.

Equation 17.1 – Manifold Pressure for Derated Gas WHERE:

• MP ACT = Manifold Pressure (in. W.C.) at Altitude – Manifold pressure setting for the heater being installed
• BTU TBL = BTU/ft3 Content of Gas – Obtained from Tables 16.1 or 16.2 (whichever is applicable)
• BTU ACT = BTU/ft3 Content of Gas – Obtained from the local utility company
• MP SL = Manifold Pressure (in. W.C.), at Sea Level – Use 3.5″ W.C. for natural gas and 10.0″ W.C. for propane gas

NOTE: Only the primary manifold pressure should be adjusted on units equipped with two-stage or modulating gas controls.

No adjustments to the lowf fire manifold pressure are necessary on these units.

Table 17.1 – High Altitude Kits for PTX/BTX ➀

Item

Code

| Item

Code

| Item

Code

| Item

Code

| Item

Code

| Item

Code

| Item

Code

0-2,000| not re-

quired

| not re-

quired

| not re-

quired

| not re-

quired

| not re-

quired

| not re-

quired

| not re-

quired

2,001-5,500| 67248| 67248| 67248| 67248| 67248| 67248| 68413
5,501-6,500| 67248| 67248| 67248| 67248| 67412| 67248| 68413
6,501-7,000| 67248| 67248| 67248| 67248| 68412| 67248| 68413
7,001-7,500| 67248| 67248| 67248| 67248| 68412| 67248| 68413
7,501-8,500| 68411| 67248| 67248| 67248| 68412| 77787| N/A
8,501-10,000| 68411| 67248| 55941| 77785| 68412| 77787| N/A
10,001-11,000| 68411| 67248| 55941| 77785| 68412| 77787| N/A
11,001- 12,000| 68411| 68411| 55941| 77785| 55949| 77787| N/A
12,001-13,000| 68411| 68411| 55941| 77785| 55949| 77787| N/A
13,001-14,000| 68411| 68411| 55941| 77785| 55949| 77787| N/A

➀ For Label Only kits(67248), Modine part number 5H0807146005 is required to be filled out and attached to the unit by the installer. Please contact the local Modine representative at 1.866.828.4328 (HEAT).

INSTALLATION – ELECTRICAL CONNECTIONS

ELECTRICAL CONNECTIONS
WARNING

1. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.
2. All appliances must be wired strictly in accordance with wiring diagram furnished with the appliance. Any wiring different from the wiring diagram could result in a hazard to persons and property.
3. Any original factory wiring that requires replacement must be replaced with wiring material having a temperature rating of at least 105°C.
4. Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% greater than rated voltage.
5. When the unit on/off toggle switch is in the “OFF” position, supply power remains energized at the rear of the switch. When a factory or field installed motor starting device such as a relay or contactor are present, supply power terminals of these components may remain energized even in the “OFF” position. When providing service on or near these terminals, de-energize building supply power to the unit.

CAUTION
Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% less than the rated voltage.

1. Installation of wiring must conform with local building codes, or in the absence of local codes, with the National Electric Code ANSI/NFPA 70 – Latest Edition. Unit must be electri cally grounded in conformance to this code. In Canada, wiring must comply with CSA C22.1, Part 1, Electrical Code.

2. Two copies of the unit wiring diagram are provided with each unit. One is located in the side access control compartment and the other is supplied in the literature packet. Refer to this diagram for all wiring connections.

3. Make sure all multi-voltage components (motors, transform ers, etc.) are wired in accordance with the power supply voltage.

4. The power supply to the unit must be protected with a fused or circuit breaker switch.

5. The power supply must be within 5 percent of the voltage rating and each phase must be balanced within 2 percent of each other. If not, advise the utility company.

6. External electrical service connections that must be installed include:

7. Supply power connection (115, 208, 230, 460, or 575 volts).

8. Connection of thermostats, or any other accessory control devices that may be supplied (24 volts).
   NOTE: All units with supply voltage 208V and greater must use a field installed step-down transformer, available as a separate accessory.

9. Refer to Figure 18.1 for the junction box wiring entry location.

10. All supply power electrical connections are made in the junction box compartment of the unit. The low voltage (thermostat and accessory control devices) can be wired to the terminals on the junction box.
    ‘Separated combustion models include a factory installed on/off toggle switch. The function of this switch is to disconnect power to the unit for maintenance or to shut the unit off in warm weather. Toggle switch is rated at 15amps at 125 volts or up to 3/4 HP at 125 volts.

Figure 18.1 – Contractor Convenience Box with Toggle Switch

INSTALLATION WITH DUCTWORK

Figure 19.1- Typical Duct & Airflow Installation

IMPORTANT
Do not attempt to attach ductwork of any kind to propeller models.

• When installing the heater, always follow good duct design practices for even distribution of the air across the heat exchanger. Recommended layouts are shown in Figure 19.1. When installing blower units with ductwork the following must be done.

1. Provide uniform air distribution over the heat exchanger. Use turning vanes where required (see Figure 19.1).
2. Provide removable access panels in the ductwork on the downstream side of the unit heater. These openings should be large enough to view smoke or reflect light inside the casing to indicate leaks in the heat exchanger and to check for hot spots on exchanger due to poor air distribution or lack of sufficient air.
3. If ductwork is connected to the rear of the unit use Modine blower enclosure kit or if using field designed enclosure maintain dimensions of blower enclosure as shown on page 27.

Additional Requirements for Installation of Blower Models (model BTX)

Determining Blower Speed

• The drive assembly and motor on gas-fired blower unit heaters with motors 2HP and below are factory assembled. 3HP and larger motors are shipped loose to prevent shipping damage. The adjustable motor sheave has been pre-set to permit operation of this unit under average conditions of air flow and without any external static pressure. The motor sheave should be adjusted as required when the unit is to be operated at other than average air flows and/or with external static pressures. Adjustment must always be within the performance range shown on page 26 and the temperature rise range shown on the unit’s rating plate.

• To determine the proper blower speed and motor sheave turns open, the conditions under which the unit is to operate must be known. If the blower unit is to be used without duct work or filters, the only criteria for determining the motor sheave turns open and blower speed is the amount of air to be delivered. The performance tables for blower models are shown on pages 22 and 23. As an example, a model BTX 350 unit, operating with no external static pressure, that is, no duct work, filters, etc., and is to deliver an air volume of 6481 cfm (cfm = cubic feet of air per minute) requires that the unit be supplied with a 5 hp motor, a -207 drive, and the drive sheave must be set at
  2.5 turns open to achieve a blower speed of 960 rpm (see performance table for units with or without blower enclosure, page 23). See “Blower Adjustments” on page 20 for setting of drive pulley turns open.

• If a blower unit is to be used with ductwork or filters, etc., the total external static pressure under which the unit is to operate, and the required air flow must be known before the unit can be properly adjusted.

• If Modine filters are used, the expected pressure loss through the filters is included in the performance data on page 21. If filters or ductwork are to be used with the unit, and they are not supplied by Modine, the design engineer or installing contractor must determine the pressure loss for the externally added devices or ductwork to arrive at the total external static pressure under which the unit is to operate.

• Once the total static pressure and the required air flow are known, the operating speed of the blower can be determined and the correct motor sheave adjustments made. As an example, a model BTX 350 is to be used with a Modine supplied blower enclosure and Modine supplied filters attached to ductwork. The unit is to move 6481 cfm of air flow against an external static pressure of 0.2″ W.C. Also, 0.2″ W.C. must be added for the filter pressure drop for a total of 0.4″ W.C. total pressure drop. Entering the performance table on page 22 for a BTX 350, at 6481 cfm and 0.4″ W.C. static pressure, it is seen that the unit will require a 5 hp motor using a -207 drive, and the motor sheave should be set at .5 turns open to achieve a blower speed of 1050 rpm. You can see this example differs from similar conditions in paragraph 2 by the number of turns open and a higher rpm, which is needed to overcome the added external static pressure from the filters.

INSTALLATION

To Install

1. Remove and discard the motor tie down strap and the shipping block beneath the motor adjustment screw (not used on all models.)

2. For 3 and 5 HP motors, affix sheave to the motor shaft and install motor on the motor mounting bracket. Install belt on blower and motor sheaves.
   Figure 20.1 – Blower Model

3. Adjust motor adjusting screw for a belt deflection of approximately 3/4″ with 5 pounds of force applied midway between the sheaves (refer to Figure 20.3). Since the belt tension will decrease dramatically after an initial run-in period, it is necessary to periodically re-check the tension. Excessive tension will cause bearing wear and noise.

4.  The blower bearings are lubricated for life; however, before initial unit operation the blower shaft should be lubricated at the bearings with SAE 20 oil. This will reduce initial friction and start the plastic lubricant flowing.

5. Make electrical connections according to the wiring diagram.

6. Check rotation of the blower. Motor should be in clockwise rotation when facing motor pulley. If rotation is incorrect, correction should be made by interchanging wiring within the motor. See wiring diagram on the motor.

7. The actual current draw of the motor should be determined. Under no condition should the current draw exceed that shown on the motor rating plate.

8. It is the installer’s responsibility to adjust the motor sheave to provide the specified blower performance as listed on pages 22 & 23 for blower settings different from the factory set performance. The drive number on the unit may be identified by referring to the Power Code number on the serial plate of the unit (see page 31 for model number nomenclature) and matching that number with those shown on page 21. From the listing, the drive number can be determined.

Blower Adjustments
Following electrical connections, check blower rotation to assure blow-through heating. If necessary interchange wiring to reverse blower rotation. Start fan motor and check blower sheave RPM with a hand-held or strobe-type tachometer. RPM should check out with the speeds listed in performance data shown on pages 22 and 23. A single-speed motor with an adjustable motor sheave is supplied with these units. If blower fan speed changes are required, adjust motor sheave as follows:

NOTE: Do not fire unit until blower adjustment has been made or unit may cycle on limit (overheat) control.

1. Shut-off power before making blower speed adjustments. Refer to “Determining Blower Speed” on page 19 and to “Performance Data” on pages 22 and 23 to determine proper blower RPM.
2. Loosen belt and take belt off of motor sheave.
3. Loosen set screw on outer side of adjustable motor sheave (see Figure 20.2).
4. To reduce the speed of the blower, turn outer side of motor sheave counterclockwise.
5. To increase the speed of the blower, turn outer side of motor sheave clockwise.
6. Retighten motor sheave set screw, replace belt and retighten motor base. Adjust motor adjusting screw such that there is 3/4″ belt deflection when pressed with 5 pounds of force midway between the blower and motor sheaves (see Figure 20.3). Since the belt tension will decrease dramatically after an initial run-in period, it is necessary to periodically re check the tension to assure continual proper belt adjustment.
7. Check to make certain motor sheave and blower sheave are aligned. Re-align if necessary.
8. Re-check blower speed after adjustment.
9. Check motor amps. Do not exceed amps shown on motor nameplate. Slow blower if necessary.
10. Check air temperature rise across unit. Check temperature rise against values shown in performance tables on pages 22 and 23 to assure actual desired air flow is being achieved.
11. If adjustments are required, recheck motor amps after final blower speed adjustment.

BLOWER PERFORMANCE DATA – MODEL BTX

Table 21.1 – Power Code Description – Blower Model BTX – 

Power Code| Voltage| Phase| BTX150| BTX175| BTX200| BTX250| BTX300| BTX350| BTX400
---|---|---|---|---|---|---|---|---|---
HP| Drive| HP| Drive| HP| Drive| HP| Drive| HP| Drive| HP| Drive| HP| Drive
01| 115| 1| 1/4| 230| –| –| –| –| –| –| –| –| –| –| –| –
02| 115/230| 1| 1/3| 230| 1/3| 238| 1/2| 233| 1/2| 204| 1| 240| 1 1/2| 250| 1 1/2| 247
08| 208-230/460| 3| 1/3| 230| 1/3| 238| 1/2| 233| 1/2| 204| 1| 257| 1 1/2| 251| 1 1/2| 248
11| 575| 3| 1/3| 231| 1/3| 239| 1/2| 233| 1/2| 204| 1| 257| 1 1/2| 251| 1 1/2| 248
13| 115/230| 1| 1/3| 232| 1/2| 229| 1| 229| 1| 241| 1| 241| 1 1/2| 247| –| –
19| 208-230/460| 3| 1/3| 232| 1/2| 229| 1| 259| 1| 258| 1| 258| 1 1/2| 248| 2| 177
22| 575| 3| 1/3| 233| 1/2| 229| 1| 259| 1| 258| 1| 258| 1 1/2| 248| 2| 177
24| 115/230| 1| 1/2| 229| 1| 175| 1| 175| 1.5| 23| 1 1/2| 243| 1 1/2| 252| –| –
30| 208-230/460| 3| 1/2| 229| 1| 253| 1| 253| 1.5| 177| 1 1/2| 244| 1 1/2| 180| 3| 246
33| 575| 3| 1/2| 229| 1| 253| 1| 253| 1.5| 177| 1 1/2| 244| 1 1/2| 180| 3| 246
35| 115/230| 1| 1| 175| 1 1/2| 237| 1 1/2| 235| –| –| 1 1/2| 23| –| –| –| –
41| 208-230/460| 3| 1| 253| 1 1/2| 234| 1 1/2| 236| 2| 180| 1 1/2| 177| 2| 177| 5| 245
44| 575| 3| 1| 253| 1 1/2| 234| 1 1/2| 236| 2| 180| 1 1/2| 177| 2| 177| 5| 245
52| 208-230/460| 3| –| –| –| –| –| –| –| –| 2| 177| 2| 180| –| –
55| 575| 3| –| –| –| –| –| –| –| –| 2| 177| 2| 180| –| –
63| 208-230/460| 3| –| –| –| –| –| –| –| –| 3| 112| 3| 246| –| –
66| 575| 3| –| –| –| –| –| –| –| –| 3| 112| 3| 246| –| –
74| 208-230/460| 3| –| –| –| –| –| –| –| –| –| –| 5| 245| –| –
77| 575| 3| –| –| –| –| –| –| –| –| –| –| 5| 245| –| –

For selection of correct power code, refer to the tables on pages 22 – 23.

Table 21.2 – Filter Static Pressure Drop

| BTX150| BTX175| BTX200| BTX250| BTX300| BTX350| BTX400
---|---|---|---|---|---|---|---
Filter Static (“W.C.)| 0.1| 0.2| 0.1| 0.2| 0.2| 0.2| 0.2

For blower units with enclosure and filter, add the following static pressures to the static pressure determined by the system designer for total external static pressure.

BLOWER PERFORMANCE DATA – MODEL BTX
Table 22.1 – Blower Model BTX 150-250 (40-55°F temp rise for 250 size unit) –  ‚ ƒ

External Static Pressure (“W.C.)

| | | | | 0.0| | | 0.1| | | 0.2| | | 0.3| | | 0.4| | | 0.5| | | 0.6| | | 0.7| |
Model Size| ATR| CFM| HP| RPM| Drive| Turns| RPM| Drive| Turns| RPM| Drive| Turns| RPM| Drive| Turns| RPM| Drive| Turns| RPM| Drive| Turns| RPM| Drive| Turns| RPM| Drive| Turns| HP
| 40| 2778| 1| 573| 175| 4.5| 615| 175| 4.0| 658| 175| 3.0| 699| 175| 2.5| 738| 175| 1.5| 775| 175| 1.0| 810| 175| 0.5| –| –| –| 1
| 45| 2469| 1/2|

510

| 229| 4.0|

558

| 229| 3.0|

606

| –| –|

650

| –| –|

692

| –| –|

731

| –| –|

769

| –| –|

806

| –| –| 1/2
1| –| –| 175| 4.5| 175| 4.0| 175| 3.0| 175| 2.5| 175| 2.0| 175| 1.0| 175| 0.5| 1
| | |

1/3

| | 232| 4.0| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –|

1/3

| 230| 1.0| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –
| 50| 2222| | 460| 513| 565| 612| 656| 699| 739| 779|
1/2| 229| 5.0| 229| 4.0| 229| 3.0| 229| 2.0| –| –| –| –| –| –| –| –| 1/2
| | | 1| | –| –| | –| –| | 175| 4.5| | 175| 4.0| | 175| 3.0| | 175| 2.5| | 175| 1.5| | 175| 1.0| 1
| | | 1/4 ➁| | 230| 2.5| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| 1/4
| | |

1/3

| | 232| 5.0| | 232| 3.5| | 232| 2.0| | –| –| | –| –| | –| –| | –| –| | –| –|

1/3

| 55| 2020| 418| 230| 2.5| 477| 230| 0.5| 532| –| –| 582| –| –| 629| –| –| 674| –| –| 717| –| –| 759| –| –
| | | 1/2| | –| –| | 229| 5.0| | 229| 3.5| | 229| 2.5| | 229| 1.5| | 229| 1.0| | –| –| | –| –| 1/2
| | | 1| | –| –| | –| –| | 175| 5.0| | 175| 4.5| | 175| 3.5| | 175| 3.0| | 175| 2.0| | 175| 1.0| 1
150| | | 1/4 ➁| | 230| 3.5| | 230| 1.5| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| 1/4
| | |

1/3

| | –| –| | 232| 4.0| | 232| 2.5| | 232| 1.5| | –| –| | –| –| | –| –| | –| –|

1/3

| 60| 1852| 384| 230| 3.5| 448| 230| 1.5| 506| 230| 0.0| 559| –| –| 609| –| –| 656| –| –| 701| –| –| 741| –| –
| | | 1/2| | –| –| | –| –| | 229| 4.0| | 229| 3.0| | 229| 2.0| | 229| 1.0| | 229| 0.5| | –| –| 1/2
| | | 1| | –| –| | –| –| | –| –| | 175| 5.0| | 175| 4.0| | 175| 3.0| | 175| 2.5| | 175| 1.5| 1
| | | 1/4 ➁| | 230| 4.0| | 230| 2.0| | 230| 0.5| | –| –| | –| –| | –| –| | –| –| | –| –| 1/4
|

65

|

1709

| 1/3|

354

| 230| 4.0|

423

| 232| 4.5|

485

| 232| 3.0|

540

| 232| 2.0|

592

| 232| 1.0|

642

| –| –|

690

| –| –|

735

| –| –| 1/3
1/2| –| –| –| –| 229| 4.5| 229| 3.5| 229| 2.5| 229| 1.5| 229| 0.5| –| –| 1/2
| | | 1| | –| –| | –| –| | –| –| | 175| 5.0| | 175| 4.0| | 175| 3.5| | 175| 2.5| | 175| 1.5| 1
| | | 1/4 ➁| | 230| 5.0| | 230| 3.0| | 230| 1.0| | –| –| | –| –| | –| –| | –| –| | –| –| 1/4
|

70

|

1587

| 1/3|

329

| 230| 5.0|

403

| 232| 5.0|

467

| 232| 3.5|

525

| 232| 2.5|

580

| 232| 1.0|

635

| 232| 0.0|

680

| –| –|

722

| –| –| 1/3
1/2| –| –| –| –| 229| 5.0| 229| 4.0| 229| 2.5| 229| 1.5| 229| 0.5| 229| 0.0| 1/2
| | | 1| | –| –| | –| –| | –| –| | –| –| | 175| 4.5| | 175| 3.5| | 175| 2.5| | 175| 2.0| 1
|

40

|

3241

| 1|

625

| 175| 3.5|

655

| 175| 3.0|

690

| 175| 2.5|

727

| –| –|

764

| –| –|

799

| –| –|

834

| –| –|

866

| –| –| 1
1-1/2| –| –| –| –| –| –| 237| 5.0| 237| 4.5| 237| 3.5| 237| 2.5| 237| 2.0| 1-1/2
|

45

|

2881

| 1|

555

| 175| 5.0|

589

| 175| 4.5|

630

| 175| 3.5|

672

| 175| 3.0|

712

| 175| 2.0|

750

| 175| 1.5|

786

| –| –|

821

| –| –| 1
1-1/2| –| –| –| –| –| –| –| –| –| –| 237| 4.5| 237| 4.0| 237| 3.0| 1-1/2
| | | 1/2| | 229| 4.5| | 229| 3.5| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| 1/2
| 50| 2593| 1| 500| –| –| 538| 175| 5.0| 584| 175| 4.5| 630| 175| 3.5| 673| 175| 3.0| 713| 175| 2.0| 751| 175| 1.5| 788| 175| 0.5| 1
| | | 1-1/2| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | 237| 4.5| | 237| 4.0| 1-1/2
| | | 1/3| | 238| 2.5| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| 1/3
|

55

|

2357

| 1/2|

454

| 229| 5.0|

497

| 229| 4.5|

548

| 229| 3.5|

597

| 229| 2.5|

642

| –| –|

684

| –| –|

724

| –| –|

763

| –| –| 1/2
1| –| –| –| –| 175| 5.0| 175| 4.0| 175| 3.5| 175| 2.5| 175| 2.0| 175| 1.0| 1
| | | 1-1/2| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | 237| 5.0| | 237| 4.5| 1-1/2
175| | | 1/3| | 238| 4.0| | 238| 2.5| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| 1/3
|

60

|

2160

| 1/2|

416

| –| –|

464

| 229| 5.0|

520

| 229| 4.0|

571

| 229| 3.0|

618

| 229| 2.0|

662

| 229| 1.0|

705

| –| –|

745

| –| –| 1/2
1| –| –| –| –| –| –| 175| 4.5| 175| 4.0| 175| 3.0| 175| 2.0| 175| 1.5| 1
| | | 1-1/2| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | 237| 4.5| 1-1/2
| | | 1/3| | 238| 4.5| | 238| 3.0| | 238| 1.5| | 238| 0.0| | –| –| | –| –| | –| –| | –| –| 1/3
|

65

|

1994

| 1/2|

384

| –| –|

438

| –| –|

497

| 229| 4.5|

550

| 229| 3.5|

599

| 229| 2.5|

645

| 229| 1.5|

690

| 229| 0.5|

733

| –| –| 1/2
1| –| –| –| –| –| –| 175| 5.0| 175| 4.0| 175| 3.5| 175| 2.5| 175| 1.5| 1
| | | 1-1/2| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | 237| 5.0| 1-1/2
| | | 1/3| | 238| 5.0| | 238| 3.5| | 238| 2.0| | 238| 0.5| | –| –| | –| –| | –| –| | –| –| 1/3
| 70| 1852| 1/2| 356| –| –| 415| –| –| 477| 229| 5.0| 533| 229| 3.5| 584| 229| 2.5| 632| 229| 1.5| 678| 229| 1.0| 728| –| –| 1/2
| | | 1| | –| –| | –| –| | –| –| | –| –| | 175| 4.5| | 175| 3.5| | 175| 3.0| | 175| 2.0| 1
| 40| 3704| 1-1/2| 715| 235| 3.5| 741| 235| 2.5| 770| 235| 2.0| –| –| –| –| –| –| –| –| –| –| –| –| –| –| –| 1-1/2
| | |

1

| | 175| 3.5| | 175| 3.0| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –|

1

| 45| 3292| 635| 229| 1.5| 665| 229| 1.0| 698| –| –| 735| –| –| 772| –| –| 807| –| –| 841| –| –| 873| –| –
| | | 1-1/2| | 235| 5.0| | 235| 3.0| | 235| 4.0| | 235| 3.0| | 235| 2.0| | 235| 1.0| | 235| 0.0| | –| –| 1-1/2
| | |

1

| | 175| 4.5| | 175| 4.0| | 175| 3.5| | 175| 2.5| | 175| 2.0| | 175| 1.5| | –| –| | –| –|

1

| 50| 2963| 571| 229| 3.0| 604| 229| 2.5| 643| 229| 1.5| 684| 229| 0.5| 723| 229| 0.0| 761| –| –| 797| –| –| 831| –| –
| | | 1-1/2| | –| –| | –| –| | 235| 5.0| | 235| 4.0| | 235| 3.0| | 235| 2.0| | 235| 1.5| | 235| 0.5| 1-1/2
| | | 1/2| | 233| 2.5| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| 1/2
|

55

|

2694

|

1

|

519

| –| –|

556

| 175| 5.0|

600

| 175| 4.0|

644

| 175| 3.5|

686

| 175| 2.5|

725

| 175| 2.0|

763

| 175| 1.0|

799

| 175| 0.5|

1

229| 4.0| 229| 3.0| 229| 2.5| 229| 1.5| 229| 0.5| 229| 0.0| –| –| –| –
| | | 1-1/2| | –| –| | –| –| | –| –| | 235| 5.0| | 235| 4.0| | 235| 3.0| | 235| 2.0| | 235| 1.0| 1-1/2
200| | | 1/2| | 233| 2.5| | 233| 2.5| | 233| 1.5| | –| –| | –| –| | –| –| | –| –| | –| –| 1/2
|

60

|

2469

|

1

|

475

| –| –|

516

| –| –|

565

| 175| 4.5|

612

| 175| 4.0|

656

| 175| 3.0|

697

| 175| 2.5|

736

| 175| 1.5|

774

| 175| 1.0|

1

229| 5.0| 229| 4.0| 229| 3.0| 229| 2.0| 229| 1.0| 229| 0.5| –| –| –| –
| | | 1-1/2| | –| –| | –| –| | –| –| | –| –| | 235| 5.0| | 235| 4.0| | 235| 3.0| | 235| 2.0| 1-1/2
| | | 1/2| | 233| 4.5| | 233| 3.5| | 233| 2.0| | 233| 1.0| | 233| 0.0| | –| –| | –| –| | –| –| 1/2
|

65

|

2279

|

1

|

439

| –| –|

484

| –| –|

537

| 175| 5.0|

586

| 175| 4.5|

632

| 175| 3.5|

675

| 175| 2.5|

716

| 175| 2.0|

756

| 175| 1.5|

1

–| –| 229| 4.5| 229| 3.5| 229| 2.5| 229| 1.5| 229| 1.0| 229| 0.0| –| –
| | | 1-1/2| | –| –| | –| –| | –| –| | –| –| | –| –| | 235| 4.5| | 235| 3.5| | 235| 2.5| 1-1/2
| | | 1/2| | 233| 5.0| | 233| 4.0| | 233| 2.5| | 233| 1.5| | 233| 0.5| | –| –| | –| –| | –| –| 1/2
|

70

|

2116

|

1

|

407

| –| –|

457

| –| –|

513

| –| –|

565

| 175| 4.5|

612

| 175| 4.0|

657

| 175| 3.0|

700

| 175| 2.5|

742

| 175| 1.5|

1

–| –| 229| 5.0| 229| 4.0| 229| 3.0| 229| 2.0| 229| 1.0| 229| 0.5| –| –
| | | 1-1/2| | –| –| | –| –| | –| –| | –| –| | –| –| | 235| 5.0| | 235| 3.5| | 235| 2.5| 1-1/2
|

40

|

4630

| 1-1/2|

542

| 23| 4.5|

569

| 23| 4.0|

599

| 23| 3.0|

629

| –| –|

658

| –| –|

688

| –| –|

716

| –| –|

744

| –| –| 1-1/2
2| –| –| –| –| 180| 4.5| 180| 4.0| 180| 3.0| 180| 2.0| 180| 1.5| 180| 0.5| 2
| | | 1| | 241| 3.5| | 241| 2.5| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| 1
| 45| 4115| 1-1/2| 482| –| –| 513| –| –| 546| 23| 4.5| 580| 23| 3.5| 613| 23| 2.5| 645| 23| 1.5| 675| 23| 0.5| 704| –| –| 1-1/2
| | | 2| | –| –| | –| –| | –| –| | 180| 5.0| | 180| 4.5| | 180| 3.5| | 180| 2.5| | 180| 1.5| 2

250

| | | 1| | 241| 4.5| | 241| 3.5| | 241| 3.0| | 241| 2.0| | 241| 1.0| | –| –| | –| –| | –| –| 1
50| 3704| 1-1/2| 433| –| –| 468| –| –| 506| –| –| 543| 23| 4.5| 578| 23| 3.5| 612| 23| 2.5| 644| 23| 1.5| 674| 23| 0.5| 1-1/2
| | | 2| | –| –| | –| –| | –| –| | –| –| | 180| 5.0| | 180| 4.5| | 180| 3.5| | 180| 2.5| 2
| | | 1/2| | 204| 3.0| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| | –| –| 1/2
|

55

|

3367

| 1|

394

| 241| 5.0|

432

| 241| 4.5|

474

| 241| 3.5|

513

| 241| 2.5|

551

| 241| 1.5|

586

| 241| 1.0|

620

| 241| 0.0|

652

| –| –| 1
| 1-1/2| –| –| –| –| –| –| –| –| 23| 4.5| 23| 3.5| 23| 2.0| 23| 1.0| 1-1/2
| | | 2| | –| –| | –| –| | –| –| | –| –| | –| –| | 180| 5.0| | 180| 4.0| | 180| 3.0| 2

Table 22.2 – Alternate Drives for 208-230/460V 3 Ph, 1 HP Motors

BTX200

| 175| =| 253
229| =| 259
BTX250| 241| =| 258

Table 22.3 – Alternate Drives for 208-230/460V 3 Ph, 1-1/2 HP Motors

Model| 1-1/2 HP Drive Listed| 1-1/2 HP Drive for 230/460V
---|---|---
BTX150| –| =| –
BTX175| 237| =| 234
BTX200| 235| =| 236
BTX250| 23| =| 177

Table 22.4 – Alternate Drives for 575V

BTX150

| 175| =| 253
230| =| 231
232| =| 233
BTX175| 175| =| 253
237| =| 234
238| =| 239
BTX200| 175| =| 253
229| =| 259
235| =| 236
BTX250| 23| =| 177
241| =| 258

1. Outputs shown are for elevations up to 2000′. For elevations over 2000’, output needs to be reduced 4% for
   each 1000′ above sea level. (Does not apply in Canada – see rating plate).

2. Sheave turns open are approximate.

3. For proper operation, check blower rpm. For 230/460V (1 HP and 1-1/2 HP) or 575V selections, see Tables 22.2, 3, & 4 for the corrected drive number.

Table 23.1 – Blower Model BTX 250-400 (60-70°F temp rise for 250 size unit) – Table 23.2 – Alternate Drives for 208-230/460V 3 Ph, 1 HP Motors

Table 23.3 – Alternate Drives for 208-230/460V 3 Ph, 1-1/2 HP Motors

Model| 1-1/2 HP Drive Listed| 1-1/2 HP Drive for 230/460V
---|---|---
BTX300| 23| =| 177
243| =| 244
BTX350| 247| =| 248
250| =| 251
252| =| 180
BTX400| 247| =| 248
250| =| 251
252| =| 180

Table 23.4 – Alternate Drives for 575V

1. Outputs shown are for elevations up to 2000′. For elevations over 2000’, output needs to be reduced 4% for each 1000′ above sea level. (Does not apply in Canada – see rating plate).
2. Sheave turns open  are approximate.  For proper operation, check blower rpm.
3. For 230/460V (1 HP and 1-1/2 HP) or 575V selections, see Tables 23.2, 3, & 4 for the corrected drive number.

INSTALLATION – OPERATION

OPERATION
Prior to Operation

IMPORTANT

1. To prevent premature heat exchanger failure, observe heat exchanger tubes. If the tubes become red while blower and furnace are in operation, check to be sure the blower has been set to the proper rpm for the application. Refer to page 20 for blower adjustments.
2. Start-up and adjustment procedures must be performed by a qualified service agency.

Although this unit has been assembled and fire-tested at the factory, the following pre-operational procedures should be performed to assure proper on- site operation.

1. Turn off power to the unit at the disconnect switch. Check that fuses or circuit breakers are in place and sized correctly. Turn all hand gas valves to the “OFF” position.
2. Remove the side control access panel.
3. Check that the supply voltage matches the unit supply voltage listed on the Model Identification plate. Verify that all wiring is secure and properly protected. Trace circuits to insure that the unit has been wired according to the wiring diagram. If installed at altitudes above 2,000′ and the high altitude kit includes a combustion air proving switch, replace the switch in the unit with the switch provided in the kit. Take care to ensure that the tubing and electrical connections are securely fastened.
4. Check to insure that the venting system is installed correctly and free from obstructions. Before you start use the following steps to verify that the venting system is adequately sized:
5. Seal any unused openings in the venting system.
6. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) or CSA B149.1 Installation Code -latest edition and these instructions. Determine that there is no blockage or restriction, leakage, corrosion, or other deficiencies, which could cause an unsafe condition.
7. Insofar as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system is (are) located and other spaces of the building. Turn on clothes dryers and any exhaust fans such as range hoods and bathroom exhausts, so they shall operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
8. Follow the lighting instructions. Place the appliance being inspected in operation. Adjust thermostat so that the appliance will operate continuously.
9. 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-burning appliance to their previous conditions of use.
10. If improper venting is observed during any of the above tests, the venting system must be corrected.
11. Check to see that there are no obstructions to the intake and discharge of the unit.
12. Check fan clearance. Fan should not contact casing when spun by hand.
13.  Check to make sure that all filters are in place and that they are installed properly according to direction of air flow (if applicable).
14. Perform a visual inspection of the unit to make sure no damage has occurred during installation. Check to ensure all fasteners are in place and the burner openings are properly aligned with the heat exchanger tubes and that the gas orifices are centered in the burner inspirator tube opening.
15. Check that all horizontal deflector blades are open a minimum of 30° as measured from vertical.
16. Turn on power to the unit at the disconnect switch.
17. Check the thermostat, ignition control, gas valve, and supply fan blower motor for electrical operation. If these do not function, recheck the wiring diagram.
18. Check the blower wheel for proper direction of rotation when compared to the air flow direction arrow on the blower housing (if applicable). Blower wheel rotation, not air movement, must be checked as some air will be delivered through the unit with the blower wheel running backwards.
19. For blower units, check the blower speed (rpm). Refer to “Blower Adjustments” for modification.
20. Check the motor speed (rpm).
21. Check the motor voltage.
22. Check the motor amp draw to make sure it does not exceed the motor nameplate rating.
23. Recheck the gas supply pressure at the field installed manual shut-off valve. The minimum inlet pressure should be 6″ W.C. on natural gas and 11″ W.C. on propane gas. The maximum inlet pressure for either gas is 14″ W.C. If inlet pressure exceeds 14″ W.C., a gas pressure regulator must be added upstream of the combination gas valve.
24. Open the field installed manual gas shut-off valve.
25. Place the manual main gas valve on the combination gas valve in the “On” position. Call for heat with the thermostat.
26. Check to make sure that the main gas valve opens. Check the manifold gas pressure (see “Main Gas Adjustment”) while the supply fan blower is operating.
27.  Check to insure that gas controls sequence properly (see “Control Operating Sequence”). If you are not familiar with the unit’s controls (i.e. combination gas control), refer to the control manufacturer’s literature supplied with the unit.
28. Once proper operation of the unit has been verified, remove any jumper wires that were required for testing.
29. Replace the side control access panel.
30. If installed at altitudes above 2,000′, affix label included with high altitude kit and fill in all fields with a permanent marker.

Main Burner Adjustment

• The gas pressure regulator (integral to the combination gas control) is adjusted at the factory for average gas conditions. It is important that gas be supplied to the unit heater in accordance with the input rating on the serial plate. Actual input should be checked and necessary adjustments made after the unit heater is installed. Over-firing, a result of too high an input, reduces the life of the appliance and increases maintenance. Under no circumstances should the input exceed that shown on the serial plate.
• Measuring the manifold pressure is done at the outlet pressure tap of the gas valve.

To Adjust the Manifold Pressure

1. Move the field installed manual shut-off valve to the “OFF” position.
2. Remove the 1/8″ pipe plug from the outlet pressure tap on the gas valve and attach a water manometer of “U” tube type which is at least 12″ high.
3. Move the field installed manual gas shut-off valve to the “ON” position.
4. Create a high-fire call for heat from the thermostat.
5. Refer to Table 15.1 to determine the correct high fire manifold pressure for the gas type of the unit. Pressures at 0- 2,000′ elevation are 3.5″ W.C. for natural gas, 10″ W.C. for propane gas, for elevations above 2,000′ refer to the instructions in “Gas Connections – High Altitude Accessory Kit” on page 16. Adjust the main gas pressure regulator spring to achieve the proper manifold pressure (for location, see the combination gas control literature supplied with unit).
6. After adjustment, move the field installed manual shut-off valve to the “OFF” position and replace the 1/8″ pipe plug.
7. After the plug is in place, move the field installed manual shut-off valve to the “ON” position and recheck pipe plugs for gas leaks with soap solution.

CONTROL OPERATING SEQUENCE / UNIT COMPONENTS

CONTROL OPERATING SEQUENCE
Upon a call for heat from the thermostat, power is supplied to the power exhauster motor. The unit will go through a purge period and then the direct spark igniter will be energized. At the same time, the main valve in the combination control valve will open to allow gas to flow to the burners. If the fan motor has not already started it will start shortly. If a flame is not sensed within 7 seconds for any reason the main valve will close and there will be a short purge period before ignition is tried again. If the flame is not sensed after 4 tries there will be at least a 1 hour wait before ignition is tried again.

Figure 25.1 – Major Gas, Electrical Service, Safety and Other Components

1. Power Exhauster
2. Pressure Switch
3. Integrated Direct Spark Control Board
4. Combination Gas Control
5. Control Transformer
6. Flame Sensor (hidden)
7. Direct Spark Igniter (hidden)
8. Auto Reset Limit Control (hidden)
9. Gas Pipe Connection
10. Horizontal Air Deflector Blades

Table 25.1 – Control Options

Control Description| Control Code No.| Service Voltage| Thermostat Voltage| Type of Gas
---|---|---|---|---
Single-Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry

Utilizes a single-stage combination gas control with ignition control. Gas is lit with a direct spark igniter on call for heat.

| 11| 115V| 24V| natural
21| 115V| 24V| propane
Two-Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry

Utilizes a two-stage combination gas control with built-in ignition control. Firing rate is 100% and 50% of full rated input. Gas is lit with a direct spark igniter on call for heat.

| 12| 115V| 24V| natural
22| 115V| 24V| propane

GENERAL PERFORMANCE DATA – MODELS PTX & BTX
Table 26.1 – Propeller Unit Model PTX General Performance Data

| Model PTX Sizes
---|---
150| 175| 200| 250| 300| 350| 400
Btu/Hr Input CD| 150,000| 175,000| 200,000| 250,000| 300,000| 350,000| 400,000
Btu/Hr Ouput CD| 123,000| 143,500| 166,000®| 207,500®| 249,000®| 290,500®| 332,000
Efficiency| 82%| 82%| 83%®| 83%®| 83%®| 83%®| 83%
Entering Airflow (CFM) @ 70°F| 2140| 2725| 2870| 3995| 4545| 5280| 5995
Outlet Velocity (FPM)| 711| 607| 643| 721| 824| 748| 851
Air Temp. Rise (°F)| 53| 48| 52| 47| 50| 50| 51
Max. Mounting Height (Ft.) (2)| 15| 14| 15| 18| 19| 18| 21
Heat Throw (Ft.) @ Max Mtg Ht (2)| 51| 50| 53| 62| 69| 65| 74
Motor Type ®| PSC| PSC| PSC| PSC| PSC| PSC| PSC
Motor HP| 1/6| 1/6| 1/3| 1/3| 1/2| 1/2| 3/4
Motor RPM| 1075| 1075| 1075| 1075| 1075| 1125| 1125

Table 26.2 – Blower Unit Model BTX General Performance Data

| Model BTX Sizes
---|---
150| 175| 200| 250| 300| 350| 400
Btu/Hr Input CD| 150,000| 175,000| 200,000| 250,000| 300,000| 350,000| 400,000
Btu/Hr Output CD| 123,000| 143,500| 164,000| 205,000| 246,000| 287,000| 328,000
Efficiency| 82%| 82%| 82%| 82%| 82%| 82%| 82%
Entering Airflow Range (CFM)| 1587-

2778

| 1852-

3241

| 2116-

3704

| 2646-

4630

| 3175-

5556

| 3704-

6481

| 4233-

7407

Outlet Velocity (FPM)| 543-903| 428-711| 489-813| 497-826| 596-991| 543-903| 621-

1032

Air Temp. Rise (°F)| 40-70| 40-70| 40-70| 40-70| 40-70| 40-70| 40-70
Max. Mounting Height (Ft.) (2)| 9-21| 8-18| 9-21| 10-22| 11-26| 11-26| 13-29
Heat Throw (Ft.) @ Max Mtg Ht (2)| 33-75| 28-65| 32-74| 34-78| 40-94| 39-90| 44-102
Motor Type ®| T.E| T.E| T.E| T.E| T.E| T.E| T.E
Motor HP| See Table 21.1
Motor RPM| 1725| 1725| 1725| 1725| 1725| 1725| 1725

• Ratings shown are for elevations up to 2,000′. For elevations above 2,000′, ratings should be reduced at the rate of 4% for each 1,000′ above sea level (in Canada see rating plate.) Reduction of ratings requires use of a high altitude kit.
• Data taken at 55°F air temperature rise. At 65°F ambient and unit fired at full-rated input. Mounting height as measured from bottom of unit, and without deflector hoods. For units equipped with deflector hoods, see page 27.
• All motors used are produced, rated and tested by reputable manufacturers in accordance with NEMA standards and carry the standard warranty of both the motor manufacturer and Modine. All motors are totally enclosed and all single phase motors have built-in thermal overload protection.
• For models sizes 200,250,300, and 350 the efficiency is 83% for 1 pipe vented installation and 82% for 2 pipe separated combustion installation. Btu/Hr output shown is for 1 pipe vented installation, corresponding Btu/Hr output for 2 pipe separated combustion installation is 1 percentage point lower.

PERFORMANCE DATA – DEFLECTOR HOODS

Note:

• X = Feet from Heater to Start of Floor Coverage
• Y = Feet to End of Floor Coverage
• Z = Feet to End of Throw

Table 27.1 – Deflector Hood General Performance Data – Model BTX

Model Size| Airflow| Temp Rise| Mounting Height| Blade Angle| 30° Hood| 60° Hood| 90° Hood
---|---|---|---|---|---|---|---
X| Y| Z| X| Y| Z| S
(cfm)| (°F)| (ft)| (°)| (ft)| (ft)| (ft)| (ft)| (ft)| (ft)| (ft)
150| 2020| 55| 8| 57| 13| 29| 40| 0| 31| 42| 21
10| 48| 12| 28| 38| 0| 28| 39| 19
12| 37| 10| 25| 35| 0| 25| 34| 17
14| 21| 8| 21| 30| 0| 19| 27| 16
15| 10| 7| 19| 27| 0| 12| 18| 15
175| 2357| 55| 8| 51| 11| 24| 33| 0| 25| 34| 17
10| 39| 9| 22| 31| 0| 22| 30| 15
12| 22| 7| 19| 26| 0| 17| 23| 14
13| 2| 5| 14| 21| 0| 10| 14| 13
200| 2694| 55| 8| 57| 13| 29| 39| 0| 30| 41| 20
10| 47| 12| 27| 37| 0| 28| 38| 18
12| 35| 10| 25| 34| 0| 24| 33| 17
14| 18| 7| 20| 29| 0| 18| 25| 15
15| 2| 5| 16| 24| 0| 11| 16| 15
250| 3367| 55| 8| 59| 14| 31| 42| 0| 32| 44| 22
10| 50| 13| 29| 40| 0| 30| 41| 20
12| 39| 11| 27| 37| 0| 27| 37| 18
14| 25| 9| 23| 33| 0| 22| 30| 17
15| 15| 7| 20| 29| 0| 18| 25| 16
300| 4040| 55| 8| 64| 17| 37| 51| 0| 40| 54| 29
10| 57| 16| 36| 50| 0| 38| 52| 26
12| 50| 15| 35| 48| 0| 36| 49| 23
14| 41| 13| 33| 45| 0| 33| 45| 22
16| 30| 12| 30| 41| 0| 28| 39| 20
18| 14| 9| 24| 35| 0| 21| 29| 19
350| 4714| 55| 8| 63| 16| 36| 49| 0| 37| 51| 27
10| 55| 15| 34| 47| 0| 36| 49| 24
12| 47| 14| 33| 45| 0| 33| 46| 22
14| 37| 12| 30| 42| 0| 30| 41| 20
16| 25| 10| 27| 38| 0| 25| 34| 19
18| 2| 6| 20| 29| 0| 13| 19| 18
400| 5387| 55| 8| 67| 19| 41| 56| 0| 44| 60| 32
10| 60| 18| 40| 55| 0| 42| 58| 29
12| 53| 17| 39| 53| 0| 40| 55| 26
14| 46| 15| 37| 51| 0| 37| 51| 25
16| 37| 14| 34| 48| 0| 34| 47| 23
18| 26| 12| 31| 43| 0| 29| 40| 22
20| 8| 8| 23| 34| 0| 20| 28| 21

Note: Refer to Figures 27.2 through 27.3. Table 27.2 – Deflector Hood General Performance Data – Model PTX

Model Size| Airflow| Temp Rise| Mounting Height| Blade Angle| 30° Hood| 60° Hood| 90° Hood
---|---|---|---|---|---|---|---
X| Y| Z| X| Y| Z| S
(cfm)| (°F)| (ft)| (°)| (ft)| (ft)| (ft)| (ft)| (ft)| (ft)| (ft)
150| 2139| 53| 8| 60| 15| 32| 44| 0| 34| 47| 24
10| 52| 13| 31| 42| 0| 32| 44| 21
12| 42| 12| 29| 40| 0| 29| 40| 19
14| 30| 10| 26| 36| 0| 25| 34| 18
16| 9| 7| 20| 29| 0| 17| 24| 17
175| 2726| 48| 8| 60| 14| 32| 43| 0| 33| 46| 23
10| 51| 13| 30| 42| 0| 31| 43| 21
12| 41| 12| 28| 39| 0| 28| 39| 19
14| 29| 10| 25| 35| 0| 24| 33| 17
16| 8| 6| 17| 26| 0| 15| 21| 16
200| 2780| 52| 8| 59| 14| 30| 42| 0| 32| 44| 22
10| 49| 12| 29| 40| 0| 30| 41| 19
12| 39| 11| 27| 37| 0| 26| 36| 18
14| 24| 9| 23| 33| 0| 21| 30| 16
250| 3994| 47| 8| 66| 19| 41| 56| 0| 43| 59| 32
10| 60| 18| 40| 54| 0| 42| 57| 29
12| 53| 17| 38| 53| 0| 40| 54| 26
14| 46| 15| 36| 50| 0| 37| 51| 24
16| 37| 14| 34| 47| 0| 33| 46| 23
18| 26| 12| 31| 43| 0| 28| 40| 21
20| 8| 7| 22| 32| 0| 19| 26| 20
300| 4543| 50| 8| 69| 22| 45| 62| 0| 48| 66| 37
10| 63| 21| 44| 61| 0| 47| 64| 33
12| 57| 19| 43| 59| 0| 45| 62| 30
14| 51| 18| 42| 57| 0| 43| 59| 28
16| 44| 17| 40| 55| 0| 40| 55| 26
18| 35| 15| 37| 52| 0| 36| 50| 25
20| 25| 13| 33| 47| 0| 31| 43| 24
22| 9| 8| 25| 37| 0| 21| 30| 23
350| 5278| 50| 8| 68| 20| 43| 58| 0| 45| 62| 34
10| 61| 19| 42| 57| 0| 44| 60| 31
12| 55| 18| 40| 55| 0| 42| 58| 28
14| 48| 17| 39| 53| 0| 40| 54| 26
16| 40| 15| 37| 51| 0| 36| 50| 24
18| 31| 13| 34| 47| 0| 32| 44| 23
20| 17| 10| 29| 41| 0| 25| 35| 22
21| 2| 7| 23| 34| 0| 18| 26| 21
400| 5995| 51| 8| 70| 24| 49| 66| 0| 52| 71| 41
10| 65| 22| 48| 65| 0| 51| 69| 37
12| 59| 21| 47| 64| 0| 49| 67| 34
14| 54| 20| 45| 62| 0| 47| 64| 31
16| 47| 19| 44| 60| 0| 44| 61| 29
18| 40| 17| 41| 57| 0| 41| 57| 28
20| 32| 15| 38| 54| 0| 37| 51| 26
22| 21| 13| 34| 48| 0| 31| 43| 25
23| 13| 11| 31| 44| 0| 26| 37| 24

Note: Refer to Figures 27.2 through 27.3.

DIMENSIONAL DATA – MODEL PTX
Propeller Units – Model PTX

Figure 28.1 – Dimensional Drawings Table 28.1 – Dimensions (inches) – PTX 

Models| PTX150| PTX175| PTX200| PTX250| PTX300| PTX350| PTX400
---|---|---|---|---|---|---|---
A| 35.53| 42.53| 42.53| 42.53| 42.53| 42.53| 42.53
B| 23.06| 25.81| 25.81| 31.31| 31.31| 39.56| 39.56
C| 22.05| 22.05| 22.05| 22.05| 22.05| 22.05| 22.05
D| 22.52| 29.52| 29.52| 29.52| 29.52| 29.52| 29.52
E| 16.20| 18.95| 18.95| 24.46| 24.46| 32.17| 32.17
F| 15.33| 16.70| 16.70| 19.45| 19.45| 23.58| 23.58
G (Mounting Hole) @| 3/8-16| 3/8-16| 3/8-16| 3/8-16| 3/8-16| 3/8-16| 3/8-16
H| 8.37| 8.37| 8.37| 8.37| 8.37| 8.37| 8.37
I| 4.50| 4.50| 4.50| 4.50| 4.50| 4.50| 4.50
J| 8.09| 9.47| 9.47| 6.72| 6.72| 10.84| 10.84
K| 3.87| 3.87| 3.87| 5.20| 5.20| 5.20| 5.20
L| 12.17| 13.55| 13.55| 12.66| 12.66| 16.78| 16.78
M| 31.79| 32.83| 34.43| 33.83| 33.83| 34.83| 34.83
Q ®| 43.79| 44.83| 46.43| 45.83| 45.83| 46.83| 46.83
R| 3.56| 3.56| 3.56| 3.56| 3.56| 3.56| 3.56
S| 14.90| 14.90| 14.90| 14.90| 14.90| 14.90| 14.90
T| 10.00| 10.00| 10.00| 10.00| 10.00| 10.00| 10.00
U| 13.54| 20.53| 20.53| 20.53| 20.53| 20.53| 20.53
Gas Connection| 1/2| 1/2| 1/2| 3/4| 3/4| 3/4| 3/4
Vent and Combustion Air Connector Size| 4″| 4″| 4″| 6″| 6″| 6″| 6″
Fan Diameter| 20.00| 22.00| 22.00| 22.00| 22.00| 24.00| 26.13
Approx. Shipping Weight (lbs.)| 165| 210| 220| 265| 270| 310| 320

1. Do not use propeller units with duct work.
2. Listed is the hole diameter and threads per inch to accept threaded rod.
3. Dimension equals overall plus 12″.

DIMENSIONAL DATA – MODEL BTX
Blower Units – Model BTX

Figure 29.1 – Dimensional Drawings

Table 29.1 – Dimensions (inches) – BTX

Models| BTX150| BTX175| BTX200| BTX250| BTX300| BTX350| BTX400
---|---|---|---|---|---|---|---
A| 35.53| 42.53| 42.53| 42.53| 42.53| 42.53| 42.53
B| 23.06| 25.81| 25.81| 31.31| 31.31| 39.56| 39.56
C| 22.05| 22.05| 22.05| 22.05| 22.05| 22.05| 22.05
D| 22.52| 29.52| 29.52| 29.52| 29.52| 29.52| 29.52
E| 21.18| 23.93| 23.93| 24.46| 24.46| 32.17| 32.17
F| 15.33| 16.70| 16.70| 19.45| 19.45| 23.58| 23.58
G (Mounting Hole) CD| 3/8-16| 3/8-16| 3/8-16| 3/8-16| 3/8-16| 3/8-16| 3/8-16
H| 8.37| 8.37| 8.37| 8.37| 8.37| 8.37| 8.37
I| 4.50| 4.50| 4.50| 4.50| 4.50| 4.50| 4.50
J| 8.09| 9.47| 9.47| 6.72| 6.72| 10.84| 10.84
K| 3.87| 3.87| 3.87| 5.20| 5.20| 5.20| 5.20
L| 12.17| 13.55| 13.55| 12.66| 12.66| 16.78| 16.78
M @| 52.25| 52.19| 52.19| 58.88| 58.88| 58.88| 58.88
N| 33.18| 33.90| 33.90| 39.88| 39.88| 39.88| 39.88
O| 23.90| 24.13| 24.13| 27.04| 27.04| 28.57| 28.57
P| 24.77| 24.52| 24.52| 27.19| 27.19| 28.28| 28.28
Q (w/Blower Encl & Filter Rack)| 73.04| 73.70| 73.70| 79.68| 79.68| 79.68| 79.68
Q (w/o Blower Encl & Filter Rack)| 64.25| 64.19| 64.19| 70.88| 70.88| 70.88| 70.88
R| 3.56| 3.56| 3.56| 3.56| 3.56| 3.56| 3.56
S| 14.90| 14.90| 14.90| 14.90| 14.90| 14.90| 14.90
T| 10.00| 10.00| 10.00| 10.00| 10.00| 10.00| 10.00
U| 13.54| 20.53| 20.53| 20.53| 20.53| 20.53| 20.53
V| 14.52| 14.52| 14.52| 18.04| 18.04| 18.00| 18.00
W| 3.27| 7.15| 7.15| 4.77| 4.77| 5.24| 5.24
X| 17.38| 17.38| 17.38| 20.38| 20.38| 20.38| 20.38
Gas Connection| 1/2| 1/2| 1/2| 3/4| 3/4| 3/4| 3/4
Vent and Combustion Air Connector Size| 4″| 4″| 4″| 6″| 6″| 6″| 6″
Blower| 12-12| 12-12| 12-12| 15-15| 15-15| 15-15| 15-15
Approx. Shipping Weight (lbs.)| 220| 275| 280| 340| 345| 395| 405

• Listed is the hole diameter and threads per inch to accept threaded rod.
• This is an approximate dimension for standard motors, allow 3″ for sheave and optional motors.

SERVICE / MAINTENANCE / TROUBLESHOOTING

WARNING
When servicing or repairing this equipment, use only factory-approved service replacement parts. A complete replacement parts list may be obtained by contacting the factory. Refer to the rating plate on the appliance for complete appliance model number, serial number, and company address. Any substitution of parts or controls not approved by the factory will be at the owner’s risk.

CAUTION

• Service or repair of this equipment must be performed by a qualified service agency.
• Do not attempt to reuse any mechanical or electrical controllers which have been wet. Replace defective controller.

IMPORTANT
To check most of the possible remedies in the troubleshooting guide listed in Table 30.1, refer to the applicable sections of the manual.

General Maintenance

• The unit and venting system must be checked once a year by a qualified service technician.
• All installation and service of these units must be performed by a qualified installation and service agency.
• Before any service, BE SURE TO TURN OFF GAS AT THE MANUAL SHUT-OFF VALVE AHEAD OF THE COMBINATION GAS CONTROL AND TURN OFF ALL ELECTRIC POWER TO THE HEATER.

Table 30.1 – Troubleshooting

1. Power supply is off
2. No 24V power to thermostat
3. Thermostat malfunction
4. LED flashes
5. Blown fuse on control board
6. Defective control

|

1. Turn on main power
2. Check control transformer
3. If failed transformer – check thermostat wire gage and length 3 a.
4. Verify wire connections to R&W terminals only
5. Check / replace thermostat
6. Check LED flash code
7. Replace fuse
8. Replace control

LED light off or flashing|

1. Blown fuse on control board
2. Multiple causes

|

1. Replace fuse
2. Control board LED flash codes vary with control type. A decal is installed in the unit giving a brief description of the applicable codes for your heater. For more detail, see the control board data sheet included with the unit.

Unit starts but does not ignite|

1. Main gas is off
2. Air in gas line
3. Main or manifold gas pressure
4. Check gas valve switch

|

1. Open manual gas valve
2. Purge gas line
3. Set gas pressures per manual instructions
4. Set gas valve switch to “ON” position

Unit goes through cycle but the burners go out in less then 10 seconds|

1. Reversed main power polarity
2. Unit not grounded
3. Flame not sensed

|

1. Black wire – HOT, White wire – NEUTRAL, Green wire – GROUND
2. Ground unit and verify quality of ground connection
3. Check flame sense probe and connection

Air circulating fan inoperable|

1. Loose connections
2. Defective control board
3. Defective fan motor

|

1. Check all connections

2. Check control board data sheet and function

3. Check fan motor

4. Service air moving components annually.

5. Check fan for fit on motor shaft and for damage to blades.

6. Keep unit free from dust, dirt, grease, and foreign matter, paying particular attention to:

7. Combustion air inlets.

8. Burners and burner orifices. Turn off gas ahead of the combination gas control and shut off electric power to the heater. Remove the access panel, open the union on the gas line, and disconnect the igniter and sensor wires. Remove the screws that attach the burner tray to the header plate and remove the burner tray and manifold assembly from the heater. Carefully clean the burners with a wire brush or other suitable means. Replace any damaged or deteriorating burners or orifices. Install the burner assembly back onto the header, making certain that all screws, pipes and electrical connections are tight.
   CAUTION: Be careful when handling the igniter and flame sensor.

9. Inspect the flame sensor and igniter for deterioration and/or cracks.

10. Verify that the burners are touching each other at the carryover points. This will ensure flame carryover from burner to burner.

11. Clean exterior of heat exchanger tubes.

12. Fan blades.

13. Check wiring for possible loose connections.

14. The gas valves and piping should be checked annually for general cleanliness and tightness. The gas controls should be checked to insure that the unit is operating properly. See control instruction sheets furnished separately with the unit heater.

15. The power exhaust motor bearings have been lubricated for long life and do not require additional lubrication. In dirty atmospheres, it may be desirable to clean the motors and blower housing and blow out the cooling air passages of the motor with compressed air.

16. Perform periodic cleaning of inlet and vent terminal screens.

MODEL & SERIAL NUMBER / REPLACEMENT PARTS
Figure 31.1 – Model Number Designations (Serial plate located on rear panel )

Replacement Parts
When requesting parts please contact your local representative. Please have full model and serial number available. If you require assistance in locating your representative, please call the number located on the back page.

COMMERCIAL WARRANTY

• Seller warrants its products to be free from defects in material and workmanship, EXCLUSIVE, HOWEVER, of failures attributable to the use of materials substituted under emergency conditions for materials normally employed. This warranty covers replacement of any parts furnished from the factory of Seller, but does not cover labor of any kind and materials not furnished by Seller, or any charges for any such labor or materials, whether such labor, materials or charges thereon are due to replacement of parts, adjustments, repairs, or any other work done. This warranty does not apply to any equipment which shall have been repaired or altered outside the factory of Seller in any way so as, in the judgment of Seller, to affect its stability, nor which has been subjected to misuse, negligence, or operating conditions in excess of those for which such equipment was designed. This warranty does not cover the effects of physical or chemical properties of water or steam or other liquids or gases used in the equipment.
• BUYER AGREES THAT SELLER’S WARRANTY OF ITS PRODUCTS TO BE FREE FROM DEFECT IN MATERIAL AND WORKMANSHIP, AS LIMITED HEREIN, SHALL BE IN LIEU OF AND EXCLUSIVE OF ALL OTHER WARRANTIES, EITHER EXPRESS OR IMPLIED, WHETHER ARISING FROM LAW, COURSE OF DEALING, USAGE OF TRADE, OR OTHERWISE, THERE ARE NO OTHER WARRANTIES, INCLUDING WARRANTY OF MERCHANTABILITY OR FITNESS FOR PURPOSE, WHICH EXTEND BEYOND THE PRODUCT DESCRIPTION CONFIRMED BY BUYER AND SELLER AS OF THE DATE OF FINAL AGREEMENT.
• This warranty is void if the input to the product exceeds the rated input as indicated on the product serial plate by more than 5% on gas-fired and oil-fired units, or if the product in the judgment of SELLER has been installed in a corrosive atmosphere, or subjected to corrosive fluids or gases, been subjected to misuse, negligence, accident, excessive thermal shock, excessive humidity, physical damage, impact, abrasion, unauthorized alterations, or operation contrary to SELLER’S printed instructions, or if the serial number has been altered, defaced or removed.
• BUYER AGREES THAT IN NO EVENT WILL SELLER BE LIABLE FOR COSTS OF PROCESSING, LOST PROFITS, INJURY TO GOODWILL, OR ANY OTHER CONSEQUENTIAL OR INCIDENTAL DAMAGES OF ANY KIND RESULTING FROM THE ORDER OR USE OF ITS PRODUCT, WHETHER ARISING FROM BREACH OF WARRANTY, NONCONFORMITY TO ORDERED SPECIFICATIONS, DELAY IN DELIVERY, OR ANY LOSS SUSTAINED BY THE BUYER.
• BUYER’S REMEDY FOR BREACH OF WARRANTY, EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY LAW, IS LIMITED TO REPAIR OR REPLACEMENT AT THE FACTORY OF SELLER, ANY COMPONENT WHICH SHALL, WITHIN THE APPLICABLE WARRANTY PERIOD DEFINED HEREIN AND UPON PRIOR WRITTEN APPROVAL, BE RETURNED TO SELLER WITH TRANSPORTATION CHARGES PREPAID AND WHICH THE EXAMINATION OF SELLER SHALL DISCLOSE TO HAVE BEEN DEFECTIVE; EXCEPT THAT WHEN THE PRODUCT IS TO BE USED BY BUYER AS A COMPONENT PART OF EQUIPMENT MANUFACTURED BY BUYER, BUYER’S REMEDY FOR BREACH, AS LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR FROM DATE OF SHIPMENT FROM SELLER. FOR GAS-FIRED PRODUCTS INSTALLED IN HIGH HUMIDITY APPLICATIONS AND UTILIZING STAINLESS STEEL HEAT EXCHANGERS, BUYER’S REMEDY FOR BREACH, AS LIMITED HEREIN, SHALL BE LIMITED TO TEN YEARS FROM DATE OF SHIPMENT FROM SELLER.
• These warranties are issued only to the original owner-user and cannot be transferred or assigned. No provision is made in these warranties for any labor allowance or field labor participation. Seller will not honor any expenses incurred in its behalf with regard to repairs to any of Seller’s products. No credit shall be issued for any defective part returned without proper written authorization (including, but not limited to, model number, serial number,
  date of failure, etc.) and freight prepaid.

OPTIONAL SUPPLEMENTAL WARRANTY
Provided a supplemental warranty has been purchased, Seller extends the warranty herein for an additional four (4) years on certain compressors. Provided a supplemental warranty has been purchased, Seller extends the warranty herein for an additional four (4) years or nine (9) years on certain heat exchangers.

EXCLUSION OF CONSUMABLES & CONDITIONS BEYOND SELLER’S CONTROL
This warranty shall not be applicable to any of the following items: refrigerant gas, belts, filters, fuses and other items consumed or worn out by normal wear and tear or conditions beyond Seller’s control, including (without limitation as to generality) polluted or contaminated or foreign matter contained in the air or water utilized for heat exchanger (condenser) cooling or if the failure of the part is caused by improper air or water supply, or improper or incorrect sizing of power supply.

Heat Exchangers
Gas-Fired Units| TEN YEARS FROM DATE OF FIRST BENEFICIAL USE BY BUYER OR ANY OTHER USER, WITHIN TEN YEARS FROM DATE OF RESALE BY BUYER OR ANY OTHER USER, WITHIN TEN YEARS FROM DATE OF RESALE BY BUYER IN ANY UNCHANGED CONDITION, OR WITHIN ONE HUNDRED TWENTY-SIX MONTHS FROM DATE OF SHIPMENT FROM SELLER, WHICHEVER OCCURS FIRST

• Heat Exchangers
  Low Intensity Infrared Units

• Compressors
  Condensing Units for Cassettes

| FIVE YEARS FROM DATE OF FIRST BENEFICIAL USE BY BUYER OR ANY OTHER USER, WITHIN FIVE YEARS FROM DATE OF RESALE BY BUYER OR ANY OTHER USER, WITHIN FIVE YEARS FROM DATE OF RESALE BY BUYER IN ANY UNCHANGED CONDITION, OR WITHIN SIXTY-SIX MONTHS FROM DATE OF SHIPMENT FROM SELLER, WHICHEVER OCCURS FIRST

• Burners
  Low Intensity Infrared Units

• Other
  Components excluding Heat Exchangers, Coils, Condensers, Burners, Sheet Metal

| TWO YEARS FROM DATE OF FIRST BENEFICIAL USE BY BUYER OR ANY OTHER USER, WITHIN TWO YEARS FROM DATE OF RESALE BY BUYER IN ANY UNCHANGED CONDITION, OR WITHIN THIRTY MONTHS FROM DATE OF SHIPMENT FROM SELLER, WHICHEVER OCCURS FIRST

• Heat Exchangers/Coils

  • Indoor and Outdoor Duct Furnaces and System Units, Steam/Hot Water Units, Oil-Fired Units, Electric Units, Cassettes,
  • Vertical Unit Ventilators, Geothermal Units

• Compressors
  Vertical Unit Ventilators, Geothermal Units

• Burners
  High Intensity Infrared Units

• Sheet Metal Parts
  All Products

| ONE YEAR FROM DATE OF FIRST BENEFICIAL USE BY BUYER OR ANY OTHER USER, WITHIN ONE YEAR FROM DATE OF RESALE BY BUYER IN ANY UNCHANGED CONDITION, OR WITHIN EIGHTEEN MONTHS FROM DATE OF SHIPMENT FROM SELLER, WHICHEVER OCCURS FIRST

As Modine Manufacturing Company has a continuous product improvement program, it reserves the right to change design and specifications without notice.

Modine Manufacturing Company

• 1500 DeKoven Avenue
• Racine, WI 53403
• Phone: 1.800.828.4328 (HEAT) www.modinehvac.com

© Modine Manufacturing Company 2023

Documents / Resources

| MODINE PTX175AS0121 Gas Fired Unit Heater [pdf] Instruction Manual
PTX150AS0111, PTX175AS0121, PTX175AS0121 Gas Fired Unit Heater, PTX175AS0121, Gas Fired Unit Heater, Fired Unit Heater, Unit Heater, Heater
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References

• Modine HVAC - Find Your Comfort Level

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