Williams 3508332 Counterflow Top Vent Gas Wall Furnaces

Product Information

Specifications:

• Model Numbers: 3508332, 3508732, 5008732, 5508332, 6508732
• For Use with Natural Gas Only
• Counterflow Top Vent Gas Wall Furnaces
• Certified for use in Canada (except model numbers 6508731 and 6508732)
• Manufacturer: Williams Furnace Co.
• Address: 225 Acacia St., Colton, CA 92324, USA
• Printed in U.S.A 6/98

Introduction:

The Williams Wall Furnace is a top vent gas wall furnace designed for use with natural gas. It provides efficient heating for residential spaces. This manual provides installation and operating instructions to ensure proper usage and safety.

Optional Accessories:

The following optional accessories are available for use with the Williams Wall Furnace:

• [List of optional accessories]

Helpful Installation Information:

Prior to installation, it is important to consider the following:

• Locate a suitable wall space for installation.
• Ensure proper ventilation and combustion air.
• Gather necessary tools and materials.

Safety Rules:

To ensure safe operation and prevent fire or explosion, please adhere to the following safety rules:

• Do not store or use gasoline or other flammable vapors and liquids near the furnace.
• Installation and service must be performed by a qualified installer, service agency, or gas supplier.
• Do not install the furnace in mobile homes, trailers, or recreational vehicles.

Unpack Your Furnace:

When unpacking your Williams Wall Furnace, ensure that all components are present and undamaged. Refer to the manual for a detailed list of contents.

Basic Tools Needed:

Before installation, gather the following basic tools:

• [List of basic tools]

Basic Materials:

Prepare the following basic materials for installation:

• [List of basic materials]

Product Usage Instructions

Installing Your Wall Furnace:

Locating Wall Furnace and Thermostat:

Choose a suitable location on the wall for installation of the furnace. Also, determine the appropriate placement for the thermostat.

Combustion and Ventilation Air:

Ensure proper ventilation and combustion air according to the installation guidelines provided in the manual.

Installation:

Follow the step-by-step installation instructions provided in the manual for either recessed mount or surface mount installation.

Vent Installation:

Refer to the manual for detailed instructions on vent installation.

Mounting Your Furnace:

Mount the furnace securely according to the instructions provided in the manual.

Gas Supply and Piping:

Connect the furnace to a natural gas supply using proper piping techniques. Refer to the manual for detailed instructions.

Electrical Wiring:

Follow the electrical wiring instructions provided in the manual to connect the furnace to a power source.

Thermostat Installation:

Install the thermostat according to the instructions provided in the manual.

Optional Accessory Installation:

If you have purchased any optional accessories, follow the instructions provided in the manual for their installation.

Start Up Procedure:

Once the installation is complete, follow the start-up procedure outlined in the manual to ensure proper operation of the furnace.

Operating Your Furnace:

Refer to the manual for instructions on operating your Williams Wall Furnace.

How To Care For Your Furnace:

Maintain and care for your furnace according to the instructions provided in the manual to ensure its longevity and optimal performance.

Furnace Technical Information:

For detailed technical information about your Williams Wall Furnace, refer to the manual.

Troubleshooting Chart:

In case of any issues or malfunctions, consult the troubleshooting chart provided in the manual for possible solutions.

Wiring Diagrams:

Refer to the wiring diagrams section in the manual for detailed electrical wiring information.

Repair Parts:

If you require any repair parts, refer to the manual for a list of available parts and their ordering information.

Service Hints:

The service hints section provides additional information and tips for proper maintenance and servicing of your Williams Wall Furnace.

How To Order Repair Parts:

If you need to order repair parts, follow the instructions provided in the manual to ensure accurate ordering.

FAQs

• Q: Can I use this furnace with propane gas?
  • A: No, this furnace is designed for use with natural gas only. Model numbers 3508331, 3508731, 5008731, 5508331, and 6508731 are for use with liquefied petroleum (L.P.) gas.
• Q: Can I install this furnace in a mobile home or recreational vehicle?
  • A: No, these furnaces (both natural gas and L.P. gas) should not be installed in mobile homes, trailers, or recreational vehicles.
• Q: Where can I find additional assistance or information?
  • A: For any additional assistance or information, consult a qualified installer, service agency, or the gas supplier.

INSTALLATION & OPERATING INSTRUCTION MANUAL

owners manual
MODEL NOS. 3508332 3508732 5008732 5508332 6508732
FOR USE WITH NATURAL GAS ONLY

COUNTERFLOW TOP VENT GAS WALL FURNACES
READ THIS OWNERS MANUAL CAREFULLY BEFORE YOU INSTALL YOUR NEW WILLIAMS WALL FURNACE
WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

— Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS

MODEL NOS. 3508331 3508731 5008731 5508331 6508731
FOR USE WITH LIQUEFIED
PETROLEUM (L.P.) GAS ONLY
Save This Manual For Future Reference.

· Open all windows. · Do not try to light any appliance. · Do not touch any electrical switch; do
not use any phone in your building. · Extinguish any open flame. · Immediately call your gas supplier
from a neighbor’s phone. Follow the gas supplier’s instructions. · If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier.

WARNING: Do not install any of these fur- I
I naces (Natural or L.R Gas) in mobile
homes, trailers, or recreational vehicles.
ALL MODELS ARE CERTIFIED FOR USE IN CANADA EXCEPT 6508731 AND 6508732.

Williams Furnace Co., 225 Acacia St., Colton, CA 92324, USA

PRINTED IN U.S.A 6/98

P321005

13-15 15-17 17-18 18-19 20-21
21-23 24
25-30 31-32
32 33-36
37-38 39-46 Back Cover Back Cover

Your Warranty

The Manufacturer, Williams Furnace Co., warrants this wall furnace or heater to the original purchaser under the following conditions:
LIMITED ONE-YEAR WARRANTY
1. Any part thereof which proves to be defective in material or workmanship within one year from date of original purchase for use will be repaired or replaced al the Manufacturer’s option, FOB its factory,
2. No liability is assumed by the Manufacturer for removal or installation labor costs, nor for freight or delivery charges. LIMITED EXTENDED WARRANTY
1, In addition to the above limited one-year warranty on the complete unit, any heat exchanger which burns out or rusts under normal installation, use and service conditions during a period of nine years following expiration of the one-year warranty period will be exchanged for a like or functionally similar part.
2. No liability is assumed by the Manufacturer for removal or installation labor costs, nor for freight or delivery charges LIMITATIONS
1. THIS LIMITED WARRANTY IS THE ONLY WARRANTY MADE BY THE MANUFACTURER. IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE ARE LIMITED TO THE SAME ONE YEAR TERM AS THIS EXPRESS WARRANTY. UNDER NO CIRCUMSTANCES SHALL THE MANUFACTURER BE LIABLE FOR INCIOENTAL, CONSEQUENTIAL, SPECIAL OR CONTINGENT DAMAGES OR EXPENSES ARISING DIRECTLY OR INDIRECTLY FROM ANY DEFECT IN THE PRODUCT OR ANY COMPONENT OR FROM THE USE THEREOF THE REMEDIES SET FORTH HEREIN ARE THE EXCLUSIVE REMEDIES AVAILABLE TO THE USER AND ARE IN LIEU OF ALL OTHER REMEDIES

Some states do not allow limitations on how long an implied warranty lasts, and some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not appty to you 2. This warranty does not include any charge for labor or installation 3. This warranty does not extend to painted surfaces nor to damage or defects resulting from accident, alleration, misuse or abuse, or improper installation. 4 This warranty does not cover claims which do not involve defective workmanship or materials. DUTIES OF THE CONSUMER
1. The heating equipment must be installed by a qualified installer and operated in accordance with the installation and homeowner’s instructions furnished with the equipment.
2, Any travel, diagnostic costs, service labor, and labor to repair the defective unit will be the responsibility of the owne 3, A bill of sale, cancelled check, payment record or permit should be kept to verify purchase date to establish the warranty period. 4. Have the installer enter the requested information in the space below. GENERAL
1 The Manufacturer neither assumes nor authorizes any person to assume for it any other obligation or liability in connection with said equipment 2. Service under this warranty should be obtained by contacting your dealer Provide the dealer with the model number, serial number and purchase date verification 3. If. within a reasonable time after contacting your deale satisfactory service has not been received, contact: Customer Service Department, 225 Acacia St., Colton,
CA 92324_ for assistance 4 THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE

INSTALLATION INFORMATION

Model No.

Serial No

Orig. Purchaser Address

City and State Dealer
Address.
City and State
Installation date
authorized representative
local codes.)

Zip

who certifies

Signed by
that this appliance

has been installed in accordance

Zip

with Manufacturer’s

(Dealer or
instructions and

introduction
Please read our instructions before you install and use your furnace. This will help you obtain the full value from this furnace. It could help you avoid needless service costs, if the answer to the problem is found within this instruction manual.

Basic Description

Your Counterflow Top Vented Wall Furnace is shipped ready to install on the surface of a wall or recessed up to 9-1/4 inches in a wall, with wall studs spaced 16 inches center to center.
Vent piping and exhaust are not part of the Williams furnace package and must be purchased separately.
Always consult your local heating or plumbing inspector, building department or gas utility company regarding regulations, codes or ordinances which apply to the installation of a counterflow top vented wall furnace.
Air is drawn in at the top by the fan and discharges through a grille near the floor. A two-speed fan is used with Model 50087;55083 and 65087 series. A single speed fan is used on all other models. The furnace contains a multi- slot burner (two on Model 50087; 55083 and 65087 series) and burns either Natural or L.P (Liquefied Petroleum) Gas, depending on the model you have purchased.
The furnace controls are located behind an access door on the lower front of the furnace. All models are equipped with American Gas Association listed gas valves and pilots.

The combustion system draws combustion air directly from the room in which the furnace is installed, and through ventilation grills or ducts connected to the outdoors, such as an attic or crawl space. The combustion gases are discharged through the roof within a listed vent pipe
The furnace heat exchanger is built of heavy gauge steel treated for corrosion resistance. The fan at the top forces air down along the front, back and sides of the heat exchanger where it is discharged into the room. The furnace cabinet is also constructed of heavy gauge steel and has an enamel paint finish.
Models 3508331; 3508332; 5508331 and 5508332 are equipped with an electronic ignitionautomatic pilot relight
system. This appliance is equipped with a vent safety shutoff system designed to protect against improper venting of combustion products. Operation of this wall furnace when not connected to a properly installed and maintained ventillating system or tampering with the vent safety shutoff system can result in carbon monoxide (CO) poisioning and possible death.

Optional Accessories

OUTLET GRILLE REGISTER 6701 pg. 21 & 22 Lets you route some heated air to a second room. Mounts on side wall of second room and must be within 10 inches of wall furnace.
DIFFUSER GRILLE KIT 6703 Fig. 3, pg. 7 Lets you route some heated air in a two-way direction. Kit 6704 for one-way direction.
REAR OUTLET KIT 6801 Lets you route some heated air to a second room behind the furnace. Finished wall of second room must be within 10 inches of furnace. Ref. Fig. D, pg. 7. Built-in damper lets you shut off air flow to second room if desired.
SHORT REAR OUTLET KIT 6802 Lets you route some heated air to a second room behind the furnace when furnace is recessed mounted. Finished wall cannot be more than 3/4 inches from rear of furnace. Built-in damper lets you control the air flow to the second room.

TRIM STRIP KIT 4701
Provides finished edge at sides of wall furnace. Neutral beige enamel painted steel.
OVAL VENT KIT 9901 This U.L. listed B/W vent kit contains 4 feet of oval double-
walled vent pipe, plate spacers and starter or hold-down plate that starts the venting from the top of furnace. See page 13 for additional items you will need.
VENT ENCLOSURE KITS 9812 or 9824
These kits are used only when the furnace is surface mounted. They enclose the vent pipe from the top of the surface to the ceiling.
SIDE GRILLE KIT 6702
Allows you to direct heated air from the side of furnace into the same room.
NOTE All kits are identified on the carton by their Manufacturing Number respectively, 6701, 6703, 6704, 6801, 6802, 4701, 9901, 9812, 9824 and 6702. These numbers are also listed on the furnace rating plate.

Helpful Installation Information
The following booklets will help you in making the installation: ANSI/NFPA 70-1990 or current edition “National Electrical Code.” In Canada: CSA C22.1 Canadian Electrical Code. American National Standard NFPA54/ANSI Z223.1 1988 or current edition “National Fuel Gas Code.” Obtain from — American National Standards Institute, Inc., 1430 Broadway, New York, N.Y. 10018. In Canada: CAN/CGA B149 Installation Code.

Safety Rules

WARNING
READ THESE RULES AND THE INSTRUCTIONS CAREFULLY. FAILURE TO FOLLOW THESE RULES AND INSTRUCTIONS COULD CAUSE A MALFUNCTION OF THE FURNACE. THIS COULD RESULT IN DEATH, SERIOUS BODILY INJURY, AND/OR PROPERTY DAMAGE.
INSTALLATION MUST CONFORM TO LOCAL CODES. IN THE ABSENCE OF LOCAL CODES, INSTALLATION MUST CONFORM WITH THE NATIONAL FUEL GAS CODE, ANSI Z223.1. THE APPLIANCE, WHEN INSTALLED, MUST BE ELECTRICALLY CONNECTED AND GROUNDED IN ACCORDANCE WITH LOCAL CODES OR, IN THE ABSENCE OF LOCAL CODES, WITH THE CURRENT NATIONAL ELECTRICAL CODE ANSI/NFPA NO. 70.
IN CANADA

For L.IR gas, the minimum inlet gas supply pressure for the purpose of input adjustment is 11″ water column. The maximum inlet gas supply pressure is 13″ water column.
7. ANY SAFETY SCREEN, GUARD OR PARTS REMOVED FOR SERVICING THIS APPLIANCE MUST BE REPLACED PRIOR TO OPERATING THE APPLIANCE TO AVOID PROPERTY DAMAGE, BODILY INJURY OR DEATH.
8. INSTALL the furnace vent directly to the outdoors, so that harmful gasses will not collect inside the building. Follow the venting instructions for your type installation exactly. Use only the type and size of vent pipe and fittings specified.
9. BE SURE to provide for adequate combustion and ventilation air. See page 6. The flow of this air to the furnace must not be blocked.

1. INSTALLATION MUST CONFORM TO LOCAL
CODES OR, IN THE ABSENCE OF LOCAL CODES, THE CURRENT CAN/CGA B149 INSTALLATION CODE.
2. THE APPLIANCE, WHEN INSTALLED, MUST BE ELECTRICALLY CONNECTED AND GROUND-
ED IN ACCORDANCE WITH LOCAL CODES OR, IN THE ABSENCE OF LOCAL CODES, WITH THE CURRENT CSA C22.1 CANADIAN ELECTRICAL CODE. 3. REFERENCE IS MADE IN THIS MANUAL REGARDING GAS TYPE AS L.P.G. BE ADVISED
THAT L.RG. IS NOT AVAILABLE IN CANADA, REFER TO PROPANE/L.P. GAS.

10. NEVER test for gas leaks with an open flame. Use soap suds to check all gas connections. This will avoid the possibility of fire or explosion.
11. ALLOW furnace to cool before servicing. Always shut off electricity and gas to furnace when working on it. This will prevent any electrical shocks or burns.
12. DUE TO HIGH TEMPERATURES, locate the furnace out of traffic and away from furniture and draperies.
13. ALERT children and adults to the hazards of high surface temperature and to keep away to avoid burns or clothing ignition.

1. USE ONLY MANUFACTURER’S REPLACEMENT PARTS. USE OF ANY OTHER PARTS COULD CAUSE INJURY OR DEATH.

14. CAREFULLY supervise young children when they are in the same room with the furnace.
15. DO NOT place clothing or other flammable material on or near furnace.

2, DO NOT install this furnace in an alcove.
3_ DO NOT install these furnaces in a travel trailer, recreational vehicle or mobile home.
4. MAINTAIN all clearances specified in section “Locating Wall Furnace and Thermostat” and “Vent Installation.”
5. BE SURE furnace is for type of gas to be used. Check the rating plate by the gas valve in the lower cabinet. Do not change it to use other gases. Unsafe operation could result and could cause bodily injury and death.
6. For Natural gas, the minimum inlet gas supply pressure for the purpose of input adjustment is 5″ column. The maximum inlet gas supply pressure is T’ water column.

16. INSTALLATION and REPAIR must be done by a qualified service person. The appliance should be inspected before use and at least annually by a professional service person. More frequent cleaning may be required due to excessive lint from carpeting, bedding material, etc. It is imperative that control compartments, burners and circulating air passages be kept clean.
17. BEFORE INSTALLING: To avoid electrical shock, turn off electrical circuits that pass through the wall where you are going to install the furnace.
18. CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing

I WARNING DO NOT USE THJS HEATER IF ANY PART HAS BEEN UNDER WATER. IMMEDIATELY CALL A QUALIFIED SERVICE TECHNICIAN TO INSPECT THE HEATER AND TO REPLACE ANY PART OF THE CONTROL SYSTEM

I

AND ANY GAS CONTROL WHICH HAS BEEN UNDER WATER.

–4–

Unpack Your Furnace
The furnace is shipped in one carton containing the furnace, installation instruction booklet and hardware bag.
1. Lay carton horizontally. Remove top trim cover from its packing. Remove thumb screw at top of furnace, raise top front panel 1/2 inch and remove panel from cabinet. This is so you can get to the electrical connections later.
2. Place these and other parts, as they are removed from furnace, where they cannot be lost or damaged before you need them.
3. Bottom front panel can be removed by grasping just below handle and pulling it outward and then upward. See Fig. 1.
NOTE Check the burner rating plate, located in burner compartment, to make sure your furnace is equipped to operate on the type of gas available (either Natural or L.IRGas). Do NOT convert unit from Natural Gas to L.IR Gas or from L.F_ Gas to Natural.
4. Remove all literature and package containing thermostat, wire and metal anchors used for free standing installation.
5. Check the fan blade to be sure it spins freely.

Basic Tools Needed

Hand drill or properly grounded electric drill. Expansion bit 1/2″ to 1-5/8″ or 1/2″ and 1-1/2″ blade bits 1/8″ and 3/16″ drill bit (metal) 6 ft. folding rule or tape measure Screwdriver (med. blade) Screwdriver (Phillips head) Pliers (wire cutting) Hammer Hole Saw – 2″

1/8″ Allen wrench Stud Locator or small finish nails
Tin Snips 8″ adjustable wrench 12″ adjustable wrench Key hole saw or Sabre saw Hack saw
2- 10″ or 12″ pipe wrenches Gloves and safety glasses

Basic Materials

Pipe and fittings to make connections to furnace (see page 17).
Caulking compound – silicone rubber with a temperature rating of 500°tE
DO NOT USE types advertised as paintable or for bath tub use as most contain fillers and will not withstand high temperatures.
Pipe Joint Compound resistant to L.P. Gases.
Electrical wiring supplies as needed (see page 18).
Minimum wire size is #14 gauge copper.

3/4″ Quarter Round or other wood trim molding approximately 16′ long or Trim Accessory 4701 is recommended.
2″ x 4″ x (length as required) Spacer Blocks (see Close Off Stud Space, page 12).
Oval Vent Kit 9901 is recommended.
Vent Enclosure Kit 9812 or 9824 if furnace is to be surface mounted is recommended.
1 x 1 wood strips if Optional Side Outlet Grille Register 6701 is used.

Installing Your Wall Furnace

The following steps are needed for proper installation and safe operation of your furnace. If you have any doubts as to any requirements, always consult your local Heating or Plumbing Inspector, Building Department or Gas Utility Company regarding regulations, codes, or ordinances which apply to the installation of a vented wall furnace. Obtain professional help where needed.
The CHECK AND ADJUSTMENTS on page 24 are vital to the proper and safe operation of the furnace. Be sure they are done.

IMPORTANT
For satisfactory and trouble-free operation, be sure to:
1. Properly locate the furnace within the space to be heated.
2. Install the furnace in accordance with local codes or ordinances and instructions provided.
3. Maintain minimum clearance: Floor 0 inches or ceiling 4 inches, side wall 4 inches. For exception to minimum side wall clearance, see Fig. 3, pg. 7.
4. Be sure to provide enough combustion and ventilation air.

Locating Wall Furnace & Thermostat

Consider the following points before attempting to install the furnace:
CAUTION Do not make cut-outs in wall or ceiling before checking in the attic for ceiling joist locations and proposed venting.
The counterflow vented wall furnaces are shipped ready to install on the surface of the wall or recessed up to 9-1/4 inches in the wall, with studs 16 inches center-to-center or stud space can be framed-in to 16 inches, see page 10, Recessed Mounting.
Place the furnace near the center of the space to be heated for good air circulation. Do not put it behind a door or draperies.
Do not install the furnace in a closet, alcove, or small hallway where the furnace could be isolated by closing doors to the heater space. See Fig. 2 for the minimum clearances.

The top of the furnace must be at least 4 inches from the ceiling. See Fig. 2.
With standard furnace discharge outlet, do not install closer than 4 inches to intersecting wall. See Fig. 3B, page 7.
When using optional kits 6703 or 6704 maintain clearances as shown in Figs. 3A or 3C, page 7.
When using optional kit 6704 maintain clearance as shown in Figs. 3A and 3F, page 7. Use only optional outlet and grille kits available from manufacturer.
I_[{‘kIP_ll

Do not install the furnace in a mobile home, trailer, or recreational vehicle.

The bottom of the furnace may rest directly on a wood or concrete floor. If floor is other than wood or concrete there
must be a piece of wood or sheet metal under the furnace that is at least the same size as the bottom of the furnace.

On recessed installations the recessed portion may have 0 inches clearance to combustible material.

To provide adequate clearance and service access the front of the furnace must face the open room. Be sure that gas piping and electrical wiring can be brought to the location. See sections covering piping and electrical wiring for your type of furnace mounting.
Furnace vent must be installed directly to the outdoors so that combustion gasses will not collect inside the building.
Provide an adequate vent or flue in accordance with local codes or ordinances and instructions provided by the vent pipe manufacturer.
Check the minimum spacing needs as shown in Figs. 2 and 3, pages 6 and 7.

RNISHED FLOOR O” MIN.

FOR EXCEPllONS TO MIN. SIDE WALL CLF_CE
RG.,S’.’ k 3F3A. ,.3C

–6–

Locating Wall Furnace

0

_

I_llM

AX

_/4″MIN

WHEN

OPTIONAL

ONE-WAY

FRONT DEFLECTING

GRILLE IS USED

A.

3/4 “_-

….,% _

GRIU-E IS US[D
B.

14”

KIT I_01

OPIONA rWO-WA_

_.

REAR GRILLE

2 ¸’_ I

12 ¸’ _

12″MIN WHEN OPTIONAL T W0 -WAY F_ONT

DEFL [CTING

GRILLE

rS USED

C.

FJT 67_

OPTIONAL

ON[-

’ I,_- 3/4 MI%

WAY f_EAR GRILLE

D.
;_

_IE-WAy
F0RPONTT IONAo__
GRILL[
E.

-MI N r2

& Thermostat (Con’t)

Choose a location for the thermostat about 5 feet above
the floor on an inside wall. The thermostat wire supplied with your furnace is 20 feet long, which should be enough to run up through the attic so the thermostat can be a maximum of 16 feet from the furnace measured in a straight line, or approximately 12 feet from the furnace if the wire is run under the floor. The thermostat should be sensing average room temperature, avoid the following:

HOT SPOTS:

Concealed
Fireplaces
Registers TV sets
Radios

pipes or ducts

Lamps
Direct sunlight Kitchen

COLD SPOTS:
Concealed pipes or ducts Stairwells – drafts
Doors – drafts Unheated rooms on
other side of wall DEAD SPOTS: Behind doors
Corners, and alcoves

After picking a location that meets the requirements, check the walls, attic and roof to make sure there are no obstruc-
tions such as pipes, electric wiring, etc., which could in-
terfere with the installation of the furnace or vent pipe. If required, move them or pick a new location.

WARNING
DANGER OF PROPERTY DAMAGE, BODILY INJURY OR LOSS OF LIFE. DO NOT INSTALL FURNACE IN ANY AREA WHERE OXYGEN IS IN USE.

Combustion & Ventilation Air

WARNING
DANGER OF PROPERTY DAMAGE, BODILY INJURY OR DEATH
THE FURNACE AND ANY OTHER FUEL BURNING APPLIANCE MUST BE PROVIDED WITH ENOUGH FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF FLUE GASES. MOST HOMES WILL REQUIRE THAT OUTSIDE AIR BE SUPPLIED.
The high cost of energy for home heating has brought about new materials and methods used to construct or remodel most current homes. The improved construction and additional insulation has reduced the heat loss and made these homes much tighter around windows and doors so that infiltrated air is minimal. This creates a problem to supply combustion and ventilation air for gas-fired or other fuel burning appliances. Any use of appliances that pull air out of the house (clothes dryers, exhaust fans, fireplaces, etc.) increases this problem and appliances could be starving for air.
In addition, these energy measures mean that your home will retain more water vapor or a higher relative humidity.

High humidity, especially during cold weather, may be damaging to buildings because condensation forms on windows and inside walls.
The combination of a tight energy efficient home with the use of exhaust fans, fireplaces, clothes dryers, and gas appliances results in more and more air being drawn from the house until fresh air may be sucked in to the house down the furnace flue or fireplace chimney. Carbon monoxide can be the result. Carbon monoxide or “CO” is a colorless, odorless gas produced when fuel is not burned completely or when the flame does not receive sufficient oxygen. Automobiles, charcoal, wood fires and improperly vented or air-starved coal, oil and gas furnaces or other appliances can produce carbon monoxide.
Be aware of these air-starvation signals:
1. Headaches, nausea, dizziness.
2. Excessive humidity – heavily frosted windows, moist “clammy” sensation.
3. Fireplace smokes, won’t draw.
4. Furnace flue backs up.

–7–

Combustion & Ventilation Air (cont.)

AIR REQUIREMENTS

The requirements for providing air for combustion and ventilation are listed in the National Fuel Gas Code NFPA 54/ANSI Z223.1 (in Canada: CAN/CGA B149). Most homes will require that outside air be supplied to the furnace area by means of ventilation grilles or ducts connecting directly to the outside or spaces open to the outdoors such as attic or crawl space. The only exception is when the furnace area meets the requirements and definitions for an unconfined space with adequate air infiltration.
WARNING
DANGER OF PROPERTY DAMAGE, BODILY INJURY OR DEATH
THE FURNACE AND ANY OTHER FUEL BURNING APPLIANCE MUST BE PROVIDED WITH ENOUGH FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF FLUE GASES. MOST HOMES WILL REQUIRE THAT OUTSIDE AIR BE SUPPLIED.
All air openings and connecting ducts must comply with the following:
IF THE FURNACE IS INSTALLED IN AN AREA WITH ANOTHER GAS APPLIANCE(S), THE TOTAL INPUT RATING OF ALL APPLIANCES MUST BE CONSIDERED WHEN DETERMINING THE FREE AREA REQUIREMENTS FOR COMBUSTION AND VENTILATION AIR OPENINGS.
Ducts must have the same cross-sectional area as the free area of the openings to which they connect.
The minimum dimension of rectangular air ducts must not be less than 3 inches.
LOUVERS / GRILLES AND SCREENS COVERING FREE AREA OPENINGS
If screen is used to cover opening(s), it must not be smaller than 1/4 inch mesh. Use the free area of a louver or grille to determine the size opening required to provide the free area specified. If the free area is not known, assume a 20% free area for wood and a 60% free area for metal louvers or grilles.
EXAMPLE 1. FURNACE LOCATED IN UNCONFINED SPACE.
An unconfined space must have a volume of a minimum 50 cubic feet per 1000 Btuh of total of all appliances in area. Adjoining rooms may be included only if there are no doors between the rooms, or if special provisions are made such as ventilation grilles installed between connecting rooms.
Fig 6, page 9 shows the minimum area in square feet, based on 8 foot ceiling heights, required for different Btuh input ratings.
A. If your furnace is in an open area (unconfined space*) the air that leaks through the cracks around doors and windows may be enough for combustion and ventila-

tion air. The doors should not fit tight. The cracks around windows should not be caulked or weather stripped.
To determine if infiltration air is adequate, perform the following checks:
1. Close all doors and windows. If you have a fireplace, start a fire and wait until flames are burning vigorously.

DRAFT HOOD SPILLAGE

VENT PIPE

__L

DRAFT HOOD

I

__MATCH

MATCH

WATER HEATER

WALL FURNACE

DRAFT HOOD OPENING

2, Turn on all exhausting devices, such as: – kitchen and bathroom exhaust fans – dryers (gas and electric)
3, Turn on all vented gas appliances, such as: – heating equipment (includes any room heaters) – water heaters
4. Wait ten (10) minutes for drafts to stabilize.
5. Check for draft hood spillage at each appliance. (Hold a lighted match 2 inches from draft opening. See Fig. 4.)
B. No Spillage
Match flame pulls toward draft hood – this indicates sufficient infiltration air:
1. Return exhausting devices and appliances to the condition you found them.
C. Draft Hood Spills
If there is spillage at a draft hood (match goes out or flame wavers away from draft hood):
1. Check for plugged flue connectors and chimneys. Check and repair stoppage and test again.
2. If you have a fireplace, open a window or door near the fireplace and then check for spillage.
a. If spillage stops, do not use the fireplace without a nearby window or door open until you can supply fresh air by a permanent duct.
3. If you have kitchen and bathroom exhaust fans, turn them off and check for spillage.
a. If spillage stops, do not use exhaust fans until you can supply fresh air by a permanent duct. Circuit breakers for fans should be turned off if possible.

Combustion & Ventilation Air (cont.)

WARNING,
DANGER OF PROPERTY DAMAGE, BODILY INJURY OR DEATH
DRAFT HOOD SPILLAGE, WITH UNOBSTRUCTED VENTS, INDICATES THAT ADDITIONAL AIR MUST BE BROUGHT iNTO THE STRUCTURE FROM THE OUTSIDE. KEEP A WINDOW OPEN (MINIMUM 2 INCHES) NEAR THE APPLIANCE UNTIL A PERMANENT AIR DUCT iS INSTALLED.
4. Spillage means air starvation and a fresh air duct or air intakes must be installed to provide air directly to the furnace or other gas appliance.
D. If spillage exists or when the furnace is in a building of tight construction where the windows and doors are weatherstripped, air for combustion and ventilation must be obtained from outdoors or space open to the outdoors.
Provide an opening(s) having a total free area of 1 sq. inch per 4000 Btuh of the total of all appliances. The required area is shown in Fig. 9, page 10 under the column for (40,000).
FRESH AIR DUCT
HOLES FROM VENTILATED ATTIC INTO STUD SPACE SEE FIG 8

provided with free air for proper combustion and ventilation of flue gases by one of the following methods.
A. All Air From Inside Building:
If the confined space adjoins an unconfined space as defined in EXAMPLE 1, provide two permanent openings, one within 12 inches of the top and one within 12 inches of the bottom of the room connecting directly to unconfined space. Each opening must have a free area of at least 100 square inches or 1 square inch per 1000 Btuh combined input of appliances in one room if combined input exceeds 100,000 Btuh.
WARNING
DANGER OF PROPERTY DAMAGE, BODILY INJURY OR DEATH
THE ADJOINING UNCONFINED SPACE MUST HAVE ADEQUATE AIR INFILTRATION AS DEFINED IN EXAMPLE 1.
FOR EXAMPLE: Your furnace is rated at 50,000 Btu per hour.The water heater is rated at 30,000 Btu per hour.The total is 80,000 Btu per hour.You need two grilles, each with 100 square inches of free opening. Metal grilles have about 60% free area, so you need two metal grilles each with 160 square inches of Iouvered area.
Refer to Fig. 7, page 10, which shows grille installation.
Using the previous example, the two connecting rooms plus the closet must equal at least 500 sq. feet to handle the combined input 50,000 plus 30,000.

MINIMUM AREA IN SQUARE FEET

AIR GRILLE TO STUD SPACE

12″ MAXFROM FLOOR

HOLE IN BOTTOM OR BACK OF FURNACE INTO OPEN STUD SPACE

HOLES FROM VENTILATED CRAWL SPACE INTO STUD SEE FIG 8
OR CRAWL SPACE

SPACE

4000 Btuh Per Square lnch Opening

Round Duct

Rectangular Duct

Max. Btuh Input

4″ DIA. 4″ DIA. 4″ D[A. 4″ DIA, 4″ DIA. 4_ ” DIA

3″x3″ SQ. 3″x3″ SQ. 3″x4″ SQ. 3″x4″ SQ. 3″x5″ SQ. 3″x5″ SQ.

30,000 35,000 40,000 45,000 50_00 60_00

*Unconfined Space Min. Area In Sq. Ft.
8′ Ceiling Height
188 219 250 281 312 375

*Can be two or more rooms joined by ventilation grilles.

B. All Air From Outdoors:

Fig. 5 shows a typical duct going into ventilated crawl space or attic.
1. Duct must terminate at a point not more than 1 foot above the floor.
2. Duct size must be at least 1 inch of free area for each 4000 Btuh of input of all appliances in area.
EXAMPLE 2. FURNACE LOCATED IN CONFINED SPACE.
If furnace is installed in a confined space, it must be

If confined space doesn’t adjoin an unconfined space (defined in EXAMPLE 1) then air must be provided from outdoors or spaces open to outdoors such as attic or crawl spaces.
Provide two permanent openings, one within 12 inches of top, one within 12 inches of bottom of room connecting directly, or by using ducts, with the outdoors or areas open to outdoors.
If opening connects directly to, or within vertical duets, the free area of each opening must be at least 1 square inch per 4000 Btuh combined input of appliances in area.

m9–

Combustion & Ventilation Air (cont.)
If horizontal ducts are used, the free area of each opening must be at least 1 square inch per 2000 Btuh combined input of appliances in area.
GRILLES CONNECTING ROOMS TO MAKE UNCONFINED SPACE

FOR EXAMPLE: Your furnace is rated at 80,000 Btu per
hour. The water heater is rated at 30,000 Btu per hour. The total is 80,000 Btu per hour. You need two grilles, each with 20 square inches of free opening, unless connected by horizontal ducts which would require each grille or opening to have a free area of 40 square inches.

*Openings for inlet or outlet air should not be made into attic area if attic is equipped with a thermostat controlled
power vent.

FREE AREA IN SQ. INCHES – EACHOPENING (FURNACE ONLY) – BASED ON ONE SQ. INCH PER 4000 8TUH

Furnace Btuh / Input

Sq, Inch of Opening

Req’d Number of Holes Sill or Header Plates
1_/2” 2″ 3″

30,000 35,000 40,000 45,000 50,000 60,O00

7.5 8.75 10.0
11.25 12.5 15.0

7

4

2

8

5

2

9

5

3

10

6

3

11

6

3

13

8

4

Recessed Mount Installation

FIND THE STUDS (See CAUTION on page 6)

CUT WALL OPENING

Use a stud Iocator or small finishing nails. Repeatedly drive and remove a nail into the wall in the area of the stud until it is located. Then find the inside edge of the stud. Leave the nail at this location.
The other stud should be about 14-1/2 inches from the one found. Drive finishing nails on the insides of this stud. Draw wall cut out to required size as shown in Fig. 13, page 12. If wall studs are not on 16 inch centers see “CLOSE OFF STUD SPACE,” Fig. 12, page 12.

Provide an opening as shown in Fig. 10, page 11. Work from the top in the attic to cut away the ceiling plate.
ATTACH HEADER PLATE MODELS: 5508331; 5508332; 6508731; 6508732
Locate header plate (Fig. 10, page 11) between wall studs at 88V2 inches from finished floor and nail into position with end flanges pointing up.

–10–

Recessed Mount Installation (cont.)

See Fig. 10.
MODELS: 5008731; 5008732
Locate header plate between wall studs at 821/2 inches from finished floor and nail into position with end flanges pointing up.
MODELS: 3508331; 3508332; 3508731; 3508732
Locate header plate between wall studs at 74 inches from finished floor and nail into position with end flanges pointing up,

GAS SUPPLY OPENING
A hole must be drilled for the gas line supply.
Decide whether the gas line will come through the floor or wall stud.
NOTE
If a pre-existing gas piping stub location is not compatible with hole or knock-out provided in furnace, you may make an alternate entry hole in furnace back wall per Fig. 13, page 12.

ALL MODELS
Hole for electrical conduit is located on left side of header plate as you face the wall.

CAUTION
Be careful not to damage any furnace components while making any alternate hole.

WARNING
REMOVE 4×14 FIBERGLASS GASKET FROM BOTTOM OF HEADER PLATE AND DISCARD. THIS GASKET IS NOT USED WHEN THE FURNACE IS RECESSED IN THE WALL.

Locate and drill one (1) 1-1/2 inch hole at selected locations per Fig. 11 and Fig. 13, page 12 or Fig. 14, page !3.
Gas line can be run at this time or done after furnace is mounted, see section GAS SUPPLY AND PIPING, page 17.

F-
LEXIBLE ELECTRIC,
ONDUIT
CONVENI ENCE- OUTLET

B/W VENT PIPE

(NOT SUPPLIED) 7_r HOLD-DOWN OR
STARTER PLATE

_(NOT
/

SUPPLIED)

N
HEADER PLATE

N01: WALL BOARD &
FLOOR PLAI
REMOVEDFOR RECIE_ MOUNT ONLY
2″

,’- FINISH FLOOR
/

SURFACE _ MOUNTING

MOUNTING

f —

/

.

j

CLOSE OFF STUD SPACE (If Required) If studs are not on 16 inch centers, cut the hole for the furnace next to an existing stud and frame in the other side using a 2 x 4 and spacer blocks as required. See Fig. 12, page 12.
ELECTRICAL SUPPLY ROUGH-IN

Run the electrical supply with the ground wire and thermostat cable into stud space above furnace location.

–11 m

Recessed Mount Installation (cont.)

7
PLA’I_

CLOSE OFF STUD SPACE (If Required)

F
Ill

I_]b-I1NG b-lUD

CAUTION
Do not run wire behind flanges of header plate or in any location where it might be damaged. Avoid splicing thermostat wire unless the spliced wires are properly cleaned, soldered and taped.

II NEW S’IUD

E_S71NG S31JD t

111
III
%

] I — 14-/8″-

SPACER

1

III

HI

…..

LI-1

r-!U-I……

If desired, the power supply and thermostat cable can come into the wall stud space from a basement, crawl space or an adjoining stud space.
Terminate flexible electrical conduit at the junction box located on the underside of the header plate. Leave the wires long enough to connect inside the junction box to the convenience outlet.

[41C

.,_,- FRONT

TOP

ELEC

_,/” CONN.

“,+–141/6”-_-

BOTTOM

(1) MODELS:
(2) MODELS: (3) MODELS:

5508331; 5508332; 6508731 ; 6508732 5005731; 5008732 3508331; 3508332; 3508731; 3508732

Surface Mount Installation

FIND THE STUDS AND CEILING JOISTS (See CAUTION on page 6)
Find two studs at spot where furnace is to be placed. Use a stud indicator or small finishing nails. Repeatedly drive and remove a nail into the wall in the area of the stud until you find it. Then find one side. Leave the nail there. Drive another nail just on the other side of the same stud.
Inside edge of the other stud should be about 14-1/2 inches from the one found. Drive finishing nail on inside edge of this stud.
Using the nails as a guide, draw a line up both sides to the ceiling to locate hole cut out for vent pipe and electrical connections.

CUT CEILING OPENING
Mark off and cut 3-1/2 x 12 inch rectangular hole in ceiling, centered between wall studs. The back edge of the opening should be about 1/8 inch from the wall. See Fig. 16, page 14.
ELECTRICAL SUPPLY ROUGH-IN
The electrical supply openings must be made in the wall or ceiling above furnace to match holes in furnace top. Holes in furnace top are 1 inch from the left side of furnace. See Fig. 13.
If desired, the power supply and thermostat cable can come into the wall stud space from a basement, crawl space or an adjoining stud space.

–12–

Surface Mount Installation (cont.)

At selected location, drill a 1 inch hole for 115V power supply and a 1/2 inch hole for the thermostat cable. Run wiring through holes to above furnace top leaving enough excess wire to make electrical connections after mounting furnace.
CAUTION To avoid damage to wiring, be sure to route wire away from path of furnace vent.
GAS SUPPLY OPENING
A hole may need to be drilled for the gas line supply.
Decide whether the gas line will come through the floor or wall.
NOTE

CAUTION
I wheilecarmefaukl inngot atonydaamlteargneateanhyofluer.nace components
Locate and drill one (1) 1-1/2 inch hole at selected location per Fig. 11, page 11; Fig. 13, page 12; or Fig. 14. Gas line can be run at this time or done after the furnace is mounted, see section CONNECTING GAS LINE.
ALTERNATE GAS SUPPLY OPENING
r;

If you decide to route gas line through right side of furnace, simply remove the knock-out provided in furnace side.
NOTE
If a pre-existing gas piping stub location is not compatible with hole or knock-out provided in furnace, you may make an alternate entry hole in furnace back wall per Fig. 14.

? ALTERNATE GAS SUPPLy—“%._I
ENTRy LOCA]10N

)–‘t

GAS SUPPL_ ENTRy HOLES

General Vent Installation

The vent installation must comply with all local codes and ordinances. If in doubt, consult your local codes or inspector.
The furnace vent must be directed to the outdoors so that harmful combustion gases will not collect inside the building.
This furnace must not be connected to a chimney flue serving a separate solid- fuel burning appliance.
Use U.L. listed B/W Vent Kit 9901. You must provide other items, not contained in kit, necessary to complete your specific venting situation through the roof. Refer to typical venting system shown in Fig. 18, page 15.
Type B/W gas vent shall extend from the header plate of the vented wall furnace to a point above the highest ceiling plate within a stud space through which the vent passes, without any offsets or crossovers thei’ein. After a type B/W gas vent passes through the highest ceiling plate within a stud space above the furnace which it

serves, the vent system may be completed with a type B gas vent, of the same manufacturer, and offsets or breakovers shall not be greater than 45 degrees from vertical.
NOTE
The B/W vent must extend through the ceiling and roof terminating at least 12 feet above the finished floor on which the furnace rests.
First vent pipe offset (if required) is recommended not to be any closer than 2′-0” from header plate.
ATTACH HEADER & HOLD-DOWN PLATE (SURFACE MOUNT)
Remove the fiberglass flue collar from the furnace flue extension. This gasket is not used when the furnace is surface mounted.
Make sure that the 4 x 4 inch gasket is in position on the header plate.

–13–

General Vent Installation (cont.)

Discard the three (3) square gaskets, as they are not used when furnace is surface mounted.

INSTALL CEILING PLATE SPACERS (SURFACE MOUNT)

Slide header plate over the furnace flue extension with the junction box entering the opening in top of furnace.
Refer to Fig. 15.

Refer to Fig. 16.
Only one (1) plate spacer is required for surface mounting within a single story dwelling.

Fasten to matching holes in the furnace top through holes “A” in the header plate, using two (2) #8 x 3/8 inch screws provided. Fasten the hold-down plate or starter plate to the top of the header plate using holes “B” in the header plate.
j ,,g,,

Cut 2 inches off each end of plate spacer.
Drill two (2) 3/16 inch holes in each end of plate spacer. See Fig. 18, page 15.
Fasten plate spacer to wall by nailing through one (1) drilled hole in each end, into the wall board and ceiling plate.
INSTALL CEILING PLATE SPACER (RECESSED MOUNT)

Refer to Fig. 17.

ALL MODELS
ATTACH HOLD-DOWN PLATE (RECESSED MOUNT) NOTE
Header plate should already be attached to wall studs. See ATTACH HEADER PLATE, page 10 and 11.
Fasten hold-down plate to top of header plate using two (2) screws provided.

Two ceiling plate spacers are in the B/W vent kit. They must be fastened along each long edge of the ceiling hole to hold the oval vent pipe in the center of the hole.
Nail the ceiling plate spacers either across or in between the cut out section of ceiling plate. If nailed between, ends must be bent at 90 degrees.

CEILING PLATE SPACERS – RECESSED MOUNT

_

14 318

“_” r,_4_3V2 CENTERED ON
!1 a/w VENT

CEILING PLATE

TOP ___ HOLE IN

r_ SIDE

HOLD-DOWN OR RTER PLATE
(NOT SUPPLIED) HEADER PLATE

FRONT

INSTALL SURFACE VENT (SURFACE MOUNT)
NOTE
For surface mounting, it will be helpful to complete the gas piping supply to the furnace before installing the vent pipe. See section GAS SUPPLY & PiPiNG, page 17.
Carefully move the furnace into position under the ceiling cutout.
Insert first lengths of oval, double wall vent pipe up through the ceiling cutout.
–14 m

General Vent Installation (cont.)

TYPICAL VENT INSTALLATION

1

Vl_IT CAP “rOBE AMINo OF2 FT. HIGHER

THAN ANY pOINT _

10 FT. OF rr C

Lower vent pipe to the hold-down plate. Push the vent pipe into the hold-down plate until it is completely seated. (Hold-down cleats will engage the groove in the vent pipe.)
Secure hold-down plate to vent pipe using two (2) screws.
Using plumbers tape to secure vent to the plate spacer, nail through one (1) hole in each end of plate spacer, into the wall and ceiling plate.

INSTALL FURNACE VENT (RECESSED MOUNT)
Lower first lengths of oval, double wall vent pipe through the plate spacers to the hold-down plate.
Push the vent pipe into the hold-down plate until it is completely seated. (Hold-down cleat will engage the groove in the vent pipe.)
Secure hold-down plate to vent pipe using two (2) screws.

HEADER PLA1E

2 EDS
FLUE COLLAR QAS£T

COMPLETE THE VENTING
Refer to Fig. 18.
Install oval to round adapter. Complete the piping extending it through the roof. Use 4” round, double wall (Type B) vent pipe, roof flashing, storm collar, and vent top as shown. The vent cap must be at least 2 feet higher than any point that is within 10 feet horizontally of the vent cap. There must be at least 1 inch clearance between the vent pipe and any combustible material.
IMPORTANT
Area above header within the stud space MUST be kept clear of any attic insulation to allow the free circulation of air around oval vent piping.

Mounting Your Furnace

To obtain adequate clearance for fastening furnace or to install gas supply fittings, it may be necessary to remove the burner and control assembly as follows:
Remove burner compartment door by pulling door top out and up.
Locate the air discharge shield. It is secured across the top of the burner control compartment. Remove two (2) screws and shield and set aside.
DISCONNECT WIRING MODELS 3508331; 3508332; 5508331; 5508332
Remove the screws holding the ignition control unit and cover to the furnace casing.
Disconnect wires to free control module from its mounting location. Mark or tag each wire removed for its exact reconnection. See Fig, 19, page 16,

ALL OTHER MODELS
Disconnect two (2) 24 volt wires from the gas valve. Disconnect two (2) wire connectors from junction block midway on the thermocouple.
REMOVE BURNER AND CONTROLS MODELS: 3508331; 3508332; 3508731; 3508732
Locate the burner and screws that secure it. Remove the two (2) screws (one from each end). Lift one end of the burner at a time until free. Remove burner and controls from the compartment.
ALL OTHER MODELS
Locate the burner and hex nuts that secure it. Remove the two (2) hex nuts (one from each end). Flip up the wire hinges. Lift one end of burner at a time until free. Remove burner and controls from the compartment.

–15–

Mounting Your Furnace (cont.)
Straighten the furnace by pushing furnace bottom intothe stud space.

24V PV SEt6 24V GND
lnV
GND
WILLIAMS IGNITION CONTROL PART NUMBER P321910
LA707-01 .DWG
POSITION FURNACE (RECESSED MOUNT ONLY)
NOTE
If your furnace is surface mounted, your mounting was started during VENT INSTALLATION, page 13.To complete furnace mounting, go on to FASTEN FURNACE BOTTOM on this page.
ALL MODELS
Make sure that the flue collar gasket, Fig. 18, page 15, is in place over the flue extension. Check to see if header plate gaskets are in place.
Hold the furnace at a slight angle (top closer to the wall than bottom) with the flue extension centered under the oval hole in the header plate.
NOTE
Electrical wiring should already be routed to the header plate. If not, see sections on ELECTRICAL SUPPLY ROUGH-IN, page 12.
Place three (3) square gaskets over the junction box. See Fig. 18, page 15.
ALL MODELS
Lift furnace up so that the flue extension enters the oval hole in the header plate.

IMPORTANT
AFTER FURNACE HAS BEEN PLACED IN POSITION, MAKE SURE THE GASKETS ARE PRESSING AGAINST THE FURNACE TOP TO ELIMINATE AIR LEAKS.
FASTEN FURNACE BOTTOM (SURFACE AND RECESSED MOUNT)
NOTE
Fasteners are not furnished because of different requirements of various types of wall construction.
Fasten furnace to floor through holes provided in furnace bottom. If you have concrete flooring, use an alternate fastening method. See Fig. 20.
If burner and control assembly were removed, replace them by reversing “DISCONNECT WIRING” and “REMOVE BURNER AND CONTROLS” sections on page 15.

FURNACE MOUNTING

TOP FASTENING

– METAL ANOH(_

II
I I

NOTE: DO NOT U BOTTOM DOOR

FOR MOUNTING

–16–

IMPORTANT

Mounting Your

TO PREVENT DAMAGE TO WIRING, MAKE SURE NOT TO PINCH THE WIRES BETWEEN FURNACE COMPONENTS. KEEP THEM ROUTED AWAY FROM THE BURNER.

Resecure the air discharge shield across the top of the burner and controls compartment, Small leg of “L” shape must be positioned toward floor, pointing away from front of furnace.

Furnace (cont.)
over the back flange of furnace top and screwing to wall. See Fig. 20, page 16.
FASTEN FURNACE TOP (RECESSED MOUNTING) Fasten furnace top by drilling two (2) holes through the side flanges of furnace top and securing with two (2) screws or nails into the wall studs. See Fig. 20, page 16.

FASTEN FURNACE TOP (SURFACE MOUNTING)
Fasten furnace top to wall using two (2) metal anchors (packed in plastic bag with thermostat) by placing them

CAUTION
Be careful not to damage furnace components or wiring when drilling holes,

Gas Supply and Piping

Gas control valve, within the furnace, is shipped with a seal over gas inlet tapping. Do not remove seal until ready to connect piping.
WARNING
DANGER OF PROPERTY DAMAGE, BODILY INJURY OR DEATH.
MAKE SURE THE FURNACE IS EQUIPPED TO OPERATE ON THE TYPE OF GAS AVAILABLE. MODELS DESIGNATED AS NATURAL GAS ARE TO BE USED WITH NATURAL GAS ONLY, FURNACE DESIGNATED FOR USE WITH LIQUIFIED PETROLEUM (L.P) GAS HAVE ORIFICES SIZED FOR COMMERCIALLY PURE PROPANE GAS, THEY CAN NOT BE USED WITH BUTANE OR A MIXTURE OF BUTANE AND PROPANE.

GAS PIPING
The gas supply line must be of adequate size to handle the BTU/HR requirements and length of the run for the unit being installed.
Determine the minimum pipe size from Fig. 23, page 18, basing the length of the run from the gas meter or source to the unit.

DROP I
i_ I

PIPED SUGPAPSLy

CR0UN0 JOINT aN,0N

GAS SUPPLY
For Natural gas, the minimum inlet gas supply pressure for the purpose of input adjustment is 5″ water column. The Maximum inlet gas supply pressure is T’ water column.
For L.E gas, the minimum inlet gas supply pressure for the purpose of input adjustment is 11″ water column. The maximum inlet gas supply pressure is 13″ water column.
Gas pressure and input to the burners must not exceed the rated input and pressure shown on the rating plate. On Naturel Gas the manifold pressure should be 4 inches water column. The manifold pressure should be 10.5 inches water column for L.P. Gas. See page 32 for operation above 2000 feet altitude Office change may be required to suit gas supplied. Check with your local gas supplier.
ORIFICE SIZES
Furnace Technical Information, page 32, shows the correct orifice sizes for the different input ratings when using Natural or L.P Gas.
–17–

tlANUAL SHUT OFF VALVE
DF(Op

Gas Supply and Piping (cont.)

2 IMPERFECT

PROPER PIPING PRACTICE CONTRO L USE MODERATE

AMOUNT

OF DOPE

THREADS

_

THREAD

PIPE RIGHT LENGTH

LEAVE 2 END THREADS

[IARE ”

All piping must comply with local codes and ordinances or with the National Fuel Gas Code (ANSI Z223.1), whichever applies. In Canada: Follow CAN 1-B149 Installation Code.
Refer to Fig. 21, page 17,for the general layout at the unit. It shows the basic fittings needed.
The following rules apply:
1. Use new, properly reamed pipe free from chips such as steel or black iron pipe and fittings or other approved by local codes.
2. Do not thread pipe too far. Valve distortion or malfunction may result from excess pipe within control. Apply moderate amount of good quality dope to pipe only, leaving 2 end threads bare. If LP Gas installation, use compound resistant to action of liquified petroleum gases.
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can enter the gas valve. Drip leg must be a minimum of 3 inches long.
5. Install a manual shut-off valve.
6. Provide a 1/8 NPT test gauge connection immediately before the gas supply connection to the furnace.
GAS CONNECTION
If installation is for L.R Gas, have L.R installer use twostage regulation and make all connections from storage tank to furnace.
Use two pipe wrenches when making the connection to the valve to prevent turning or damage to gas valve.
Connection between manual shutoff valve and burner control assembly can be made with an A.G.A./C.G.A. design certified flexible connector if allowed by local codes. Drip leg and ground joint union are still required.
Tighten all joints securely.

CHECKING THE GAS PIPING
Test all piping for leaks. When checking gas piping to the furnace with gas pressure less than 1/2 PSI, shut off manual gas valve for the furnace. If gas piping is to be checked with the pressure at or above 1/2 PSI, the furnace and manual shut off valve must be disconnected during testing. (SEE WARNING BELOW.) Apply soapsuds (or a liquid detergent) to each joint. Bubbles forming indicates a leak. Correct even the slightest leak at once.

GAS PIPE SIZES

NATURAL GAS PIPE CAPACITY – BTU PER HOUR

(INCLUDES FITTINGS) PIPE SIZE

LENGTH OF PIPE – FEET

1/2 inch

3/4 inch

1 inch

20

92,000

190,000

350,000

40

63,000

130,000

245,000

60

50,000

105,000

195,000

L.P. GAS PIPE CAPACITY – BTU PER HOUR
(INCLUDES FITTINGS)

LENGTH OF PIPE – FEET

1/2 inch

3/4 inch

1 inch

20

189,000

393,000

732,000

40

129,000

267,000

504,000

60

103,000

217,000

409,000

WARNING
DANGER OF PROPERTY DAMAGE, BODILY INJURY OR DEATH.
NEVER USE A MATCH OR OPEN FLAME TO TEST FOR LEAKS. NEVER EXCEED SPECIFIED PRESSURES FOR TESTING. HIGH PRESSURES MAY DAMAGE THE GAS VALVE AND CAUSE OVER- FIRING WHICH MAY RESULT IN HEAT EXCHANGER FAILURE. LIQUID PETROLEUM (L.P.) IS HEAVIER THAN AIR AND IT WILL SETTLE IN ANY LOW AREA, INCLUDING OPEN DEPRESSIONS AND IT WILL REMAIN THERE UNLESS AREA IS VENTILATED.
NEVER ATTEMPT STARTUP OF UNIT BEFORE THOROUGHLY VENTILATING AREA.

Electrical
All electrical work must conform to your local codes and ordinances or in their absence, with National Electrical Code, ANSI/NFPA 70. If you are not familiar with wiring codes, in general, have a competent electrician do this job. In Canada: Follow C22.1, Canadian Electrical Code.

Wiring
ELECTRICAL CONNECTION
REMOVE FAN SHROUD Take out four screws holding fan shroud to side flanges of cabinet and remove shroud. See Fig. 1, page 5.

m18m

WARNING
DANGER OF PROPERTY DAMAGE, BODILY INJURY OR DEATH.
TURN OFF ELECTRIC POWER AT FUSE BOX OR SERVICE PANEL BEFORE MAKING ANY ELECTRICAL CONNECTIONS.
INSULATE WHERE NECESSARY.
ALL LINE VOLTAGE AND GROUND CONNECTIONS MUST BE COMPLETED BEFORE ELECTRICAL POWER IS RESTORED.

ELECTRICAL POWER SUPPLY
A branch circuit including this furnace must not exceed 15 Amperes, or run a separate 115V, 60 Hz, 15 Ampere circuit from a separate circuit breaker or fuse in your service entrance panel to the furnace junction box. Do not run supply wires inside the furnace cabinet, except from the top of cabinet down to junction box.

JUNCTION BOX

CAUTION

]

Be careful not to damage the fan blade when mak- 1
I ing the 115V connection to the convenience outlet.

LOW VOLTAGE CONNECTIONS
CAUTION The Heat Anticipator WILL BURN OUT if 24 volts are applied directly to thermostat by shorting out the gas valve or primary control during testing or by incorrect wiring.
WALL THERMOSTAT WIRING
Run thermostat wire to the furnace.
Avoid splicing thermostat wire unless the spliced wires are properly cleaned, soldered and taped. Connect thermostat to two wires marked “Thermostat” extending from top of furnace, using two wire nuts provided. See Wiring Diagrams, pages 37 or 38.
CAUTION
Do not connect 115V service line to the gas control valve or the wall thermostat.

115V supply wiring connection is made within the upper left corner of the furnace cabinet.
Locate 115V plug and push into the convenience outlet attached to the bottom of header plate. (It protrudes through the rectangular opening in the furnace top.)

ALL MODELS
Reinstall fan shroud to furnace front. Slots in fan shroud allow up/down adjustment. Make sure the fan blade spins freely. Tighten screws securely.
Replace top front panel and secure with thumbscrew.
Refer to paragraph covering GAS AND ELECTRICAL SUPPLY OPENINGS, page 13. Follow Wiring Diagrams, pages 37 or 38.
If you have any doubt regarding electrical hookup, or compliance with code or ordinance, consult your electrical inspector or a licensed electrician.

GROUNDING
A ground lug is installed for the ground connection. Use a copper conductor (#14 AWG) from the unit to a grounded connection in the electric service panel or a properly driven and electrically grounded ground rod.

COMPLETE WIRING DIAGRAMS ON PAGES 37 AND 38.

I19–

Thermostat Installation

1. If an old thermostat is being replaced and is in a satisfactory location and the wiring appears to be in good condition, use existing wiring. If in doubt, use new wire.
2. If a new location is chosen or if this is a new installation, thermostat cable must first be run to the location selected. All wiring must agree with local codes and ordinances. These instructions cover bringing the wire down from the attic but it can be run from a basement or crawl space using similar methods. Refer to Fig. 24.
3. Before drilling hole in wall at selected location, drive a small finishing nail through the ceiling in the corner of the wall and ceiling above the thermostat location. Pull the nail out and push a small stiff wire through the hole so it can be found in the attic. Drill a 1/2 inch hole through the ceiling wall plate.
4. Probe for obstructions in the partition. Then drill a 1/2 inch hole through wall at selected location for thermostat.
5. From the attic, feed the thermostat cable or a stiff wire through wall until even with thermostat location.
6. Snag thermostat cable through hole and pull cable through hole in wall so that 6 inches of cable protrudes.
7. Route cable to wall furnace.

MOUNTING THE THERMOSTAT
1. To remove thermostat cover, squeeze both sides and lift. See Fig. 25.
2. ‘Connect thermostat wires to the terminal screws on the thermostat base.

3. Push any excess wire back through hole in wall and plug hole with insulation to prevent drafts from affecting thermostat operation.
4. Being sure to level thermostat for best appearance, fasten thermostat base to wall through mounting holes with screws provided.
5. Replace the thermostat cover.
THERMOSTAT HEAT ANTICIPATOR

SET THE THERMOSTAT HEAT ANTICIPATOR

A simple method of setting the heat anticipator in a 24-volt thermostat (without an A.C. ammeter) is to first read the label on the gas control valve and match its rating.

Example:

If the ampere draw for the valve is .5 amps, set thermostat heat anticipator at the same
setting (.5). (Fig. 26, page 21.)

ROUTE THERMOSTAT CABLE
Ske,AL t FINISH NAIL TO LOCATE HEADER
THERMOSIAT CABLE
STIFF WIRE TO SNAG CABLE
ADJUST THERMOSTAT ANTICIPATOR Many factors affect this setting — room size, length of thermostat wire, thermostat location, etc. Additional small adjustments to increase or decrease heating cycles (4-6 per hour typical) may be required. If an amp meter is available, see instructions supplied with thermostat.
SQUEEZE RR_4LY SOl1″1SIDES AND UFT 110 R£IO,_ COVER
t,/r/…oa.l=t
NOTE Use heavier wire size if more than 20 ft. of wire is required.

–20–

Thermostat Installation (ton’t)

NOTE

MV “–X.-J -LONGER

HEAATN 0,P TOR .—,.- 1.0 .-‘–

CYCLE

SETTING

‘_

u.-,._m

Refer to installation instructions packed in the thermostat carton if you have any doubt about the above procedures.
When all is adjusted properly, the furnace burner should shut off slightly before the desired room temperature is reached. The stored heat in the appliance is enough to bring room temperature up to desired level. The heat anticipator thus makes it possible to maintain very close temperature control.

For longer “ON” time, move anticipator clockwise. For shorter “ON” time, move anticipator counterclockwise.

SIDE OUTLET NO. 6701

Optional

REAR OUTLET NO. 6801

SHORT REAR OUTLET NO. 6802

Accessory Installation
CUT WALL OPENING(S)
Make an opening(s) in the wall(s) for a Side and/or a Rear Outlet Register. See Fig. 27.

CAUTION
Use only Boots and Grilles manufacturer.

provided

by the

SIDE OUTLET
FURNACE “BACK” AGAINST WALL _

CUT WALL OPENING

REAR OUTLET

II

. II

CLEARANCES
IMPORTANT
Carefully follow all measurements and clearances given to ensure proper installation.
When SiDE OUTLET 6701 is used, the furnace casing must be exactly 4 inches from an adjacent side wall (except may be 3/4″ minimum when 1-WAY FRONT DIFFUSING GRILLE is used). See Figs. 28 and 29, page 22.
When REAR OUTLET 6801 or SHORT REAR OUTLET 6802 are used, the furnace casing must be a minimum of 12 inches from an adjacent side wall. See Figs. 3D and 3F, page 7.

a-1/4″ L_ ll-s/8″
F1NItlE9FLOOR,-J

°IIs’_os/ II

Ill I IR,-v,-

.-s/s’! I

II

l II

11

RNISHED FL_

CUT CASING OPENING(S)
Before setting the furnace into position, cut a 5 x 7 inch rectangular opening for Side Register, or 7 x 11 inch opening for a Rear Outlet Register where marked on the furnace casing. Cut carefully as edges must be straight and smooth. See Fig. 13, page 12.

/1/1
36/740″4 MOINNE-WWAHYEN OPTIONAl, FRONT DIFFUSING GRILLE IS USED

m ‘”

“J_

– 3/4”

–21–

Optional Accessory
INSTALL PLASTERGROUNDS
Install Plastergrounds as shown in Figs. 29 and 30. Flanges of Plastergrounds extend the normal thickness of plaster. If “DRYWALL” or other thin material, flanges must be trimmed off flush with wall surface.

Installation

(cont.)
– PLASTER GROUND

REAR PLASTER GROUND CENTERS EXACTLY ON THE BACK OF THE HEATER

t
1/4 ROUND TRiM

METAL FILLER

EXACTLY 41/2 FROM BACK OF THE HEATER

”

GROUND

. .

PLASTER

15_/4″

FLOOR

MOUNTING

Refer to Fig. 31.
BEFORE placing the furnace into position, place Out Boot against the furnace casing with inside of flanges exactly on edges of hole in casing. Mark hole locations on casing through the holes in Out Boot flanges
Drill #33 holes in casing at marked locations. Remove knockout plate and knockouts for screws from Inner Liner.
SIDE REGISTER ONLY
Secure a 1 x 1 wood strip (not included in this kit) to wall surface next to side outlet as a backup for metal filler strips.
Fasten metal filler strips to side of furnace casing with front surface exactly opposite front of wood backup strip.
SIDE AND REAR OUTLET REGISTERS
Place furnace in position.
With furnace in position, pass Outer Boot through Plastergrounds, holding it firmly against furnace casing. Mark and cut off the end of the Outer Boot flush with the wall surface.

Press Inner Boot against furnace Inner Liner, mark and cut off flush with the wall surface.
Fasten Outer Boot securely to furnace casing with screws provided.
SIDE OUTLET ONLY
Position inner Boot against furnace Inner Liner and fasten securely through all holes with screws provided.
REAR OUTLET ONLY
Ptace Inner Boot in position and fasten with screws along the top and bottom edges only. Place Damper Assembly inside Inner Boot and fasten with one (1) screw on each side. Thread chain through key hole in clip on Outer Grille and attach the Bell end.
SIDE AND REAR OUTLETS
Place Outlet Grille into position, drill through the wall material and Plasterground with a #33 drill bit, using the holes in grille as a template and secure with screws provided.
VENT ENCLOSURE KIT INSTALLATION (SURFACE MOUNT ONLY)
Refer to Fig. 32, page 23.
Cut Side Panels to fit between the top of furnace casing and ceiling.
Fasten Side Panels to wall parallel to furnace casing sides.
Cut Front Panel height to fit. Note that the bottom edge of Front Panel is notched to fit into the furnace casing recess. Fasten Front Panel to Side Panels with screws provided.
SIDE CASING GRILLE KIT NO. 6702
See clearances Fig. 33, page 23.
Locate marked opening(s) on furnace casing. Mark and cut an opening 1 inch wider than opening already marked (1/2 inch larger on all four sides). See Fig. 13, page 12.
Remove knockout plate and knockouts for screws from furnace inner liner.

–22–

Optional Accessory
Fasten Boot to Inner Liner with screws provided. Using holes in grille as a template, drill two (2) #33 holes in out casing and fasten securely with screws provided,

Installation (cont.)
NOTE Quarter-round wood molding may be used for trim if desired, which may be painted to match the wall.

C
VENT ENCLOSURE
FRONT

CEILING JOIST

B/W VENT

:VENT ENCLOSURE

!ILING

LOWER DOOR CASING

OPTIONAL TWO-WAY DIFFUSING GRILLE 6703

_OPTIONAL

REAR

i

DISCHARGE

o

T W O -WAY

‘ll

OIFFU SING–_

GRILLE KIT 6703

\k-,2 –4

OPTIONA _L_I

h_OPTIONAL

OUTLET _

II_ 0UTLET

KIT 6702 _I

_'” KIT 6702

o(Nill

2-WAY FRONT DIFFUSING GRILLE KIT NO. 6703

Refer to Fig. 34.

CAUTION
For use only in conjunction with a front outlet when the furnace is spaced at least 12 inches from an in-

]

tersection wall (see Fig. 35).

KIT 470R_

OPTIONAL

TRIM ST

WALL

WITH FASTENERS

PROVIDED

VENT COVER j

,==..

Metal clips on backside of grille snap into side louvers of front warm air outlet. Adjust clips with pliers if necessary. Grille may also be attached with sheet metal screws.

TRIM MOULDING (OPTIONAL}

1-WAY FRONT DIFFUSING GRILLE KIT NO. 6704
Follow instructions for 2-WAY FRONT DIFFUSING GRILLE 6703 above, except furnace clearance to an adjacent wall must be 3/4 inch minimum. See Fig. 28, page 21.

TRIM STRIP KIT NO. 4701
When desired, optional Trim Strip Kit may be used to cover the crack between furnace and wall. See Figs. 36 and 37. Place strips tight against furnace with other edge against wall surface and fasten to wall with escutcheon pins provided. Cut off trim strips to fit each furnace as required.

INSTALL VENT COVER (PROVIDED) (RECESSED MOUNT ONLY)
Place Vent Cover on top of furnace, see Fig. 37. Press snug against wall and secure through bottom to top of furnace with screw provided.

–23–

Start-Up Procedure

Start the furnace using the procedures in section OPERATING YOUR FURNACE.
WARNING DANGER OF BODILY INJURY OR DEATH. LIQUIFIED PETROLEUM L.P. GAS IS HEAVIER THAN AIR AND IT WILL SETTLE IN ANY LOW AREA, INCLUDING OPEN DEPRESSIONS AND IT WILL REMAIN THERE UNLESS AREA IS VENTILATED. NEVER ATTEMPT START-UP OF UNIT BEFORE THOROUGHLY VENTILATING AREA.
Check the furnace operation as outlined in the following instructions. If any sparking, odors or unusual noises are encountered, shut off electric power immediately. Recheck for wiring errors, or obstructions in or near fan motor.
WARNING
NATURAL GAS HEATING VALUE (BTU PER CUBIC FOOT) CAN VARY SIGNIFICANTLY, THEREFORE, IT IS THE INSTALLER’S RESPONSIBILITY TO SEE THAT BTU INPUT TO THE FURNACE IS ADJUSTED PROPERLY. FAILURE TO DO SO COULD CAUSE HEAT EXCHANGER FAILURE, ASPHYXIATION, FIRE OR EXPLOSION, RESULTING iN DAMAGE, BODILY INJURY OR DEATH. REFER TO THE NATIONAL FUEL GAS CODE (NFPA-54) TO BE SURE THE FURNACE IS BURNING FUEL AT THE PROPER RATE.

manometer having a scale range from 0 to 12 inches of water should be used for this measurement. The manifold pressure must be measured with the burner and pilot operating. Any major changes in flow must be made by changing the size of the burner orifice. Check with your local gas supplier for proper orifice sizing.
CHECK THE GAS INPUT (NATURAL GAS ONLY)
To measure the input using the gas meter, proceed as follows:
1. Turn off gas supply to all other appliances except the furnace.
2, With the furnace operating, time the smallest dial on the meter for one complete revolution. If this is a 2 cubic foot dial, divide the seconds by 2; if it is a 1 cubic foot dial, use the time in seconds as is. This gives the seconds per cubic foot of gas being delivered to the furnace.
3. Assuming natural gas with a heating value of 1000 Btu per cubic foot and 34 seconds per cubic foot used as determined by step (2), then:
Second per hour = 3,600
Input = 1,000 x 3,600 + 34 =106,000 BTU Per Hour
This measured input must not be greater than the input indicated on the rating plate of the furnace.
4. Relight all other appliances turned off in step 1 above. Be sure all pilot burners are operating.

Underfiring could cause inadequate heat, excessive condensation or ignition problems. Overfiring could cause sooting flame impingement or overheating of heat exchanger. Before starting natural gas input check, obtain heating value of gas (BTU per cubic foot) at standard conditions from your local supplier. This factor is used in “Check the Gas Input” section and procedure.
CHECK GAS INPUT AND PRESSURES
For furnace located at elevations between sea level and 2000 feet, the measured input must not be greater than the input shown on the rating plate of the furnace. For elevations above 2000 feet, the measured input must not exceed the input of the rating plate reduced by 4 percent for each 1000 feet that the furnace is above sea level.
Gas supply pressure and manifold pressure with the burners operating must also be as specified on the rating plate.

ADJUST PILOT BURNER (STANDING PILOT MODELS ONLY) Pilotflame should surround 3/8 inch to 1/2 inch of the thermocouple tip. To adjust, remove pilot adjustment screw on gas valve. Turn screw counterclockwise to increase flame, clockwise to decrease. Replace cap.
CHECK THERMOSTAT
Check thermostat operation. When set above temperature shown on the thermostat, the main burner should light. Make certain the thermostat turns off the furnace when room temperature reaches the selected setting and starts the furnace when room temperature falls a few degrees. MAKE SURE THERMOSTAT ANTICIPATOR IS SET PROPERLY, SEE PAGE 20.
THERMOSTAT (TYPICAL)

Type of Gas

Manifold

Pressure, 4
10.5

In. W.C.

Rated input will be obtained on 2500 Btu propane at 10.5 inch manifold pressure with factory-sized orfices. If LP gas having a different heating value is supplied, offices must be changed by a qualified service technician before the furnace is operated.

CHECK THE MANIFOLD GAS PRESSURE
A tapped opening is provided in the gas valve to facilitate measuring the manifold gas pressure. A “U Tube”
–24 m

SEI”_G

Operating Your Furnace

STANDING PILOT MODELS* 3508731; 3508732 5008731; 5008732 6508731; 6508732
NOTE: For models equipped with WILLIAMS gas valve P322041 or P322042 refer to this sheet and sheet 26 for “SAFETY & LIGHTING INSTRUCTION” and “TURN GAS OFF TO APPLIANCE.”
For models equipped with WILLIAMS gas valve P321704 or P321705 refer to this sheet and sheet 27 for “SAFETY & LIGHTING INSTRUCTIONS” and “TURN GAS OFF TO APPLIANCE.”
(All other models refer to sheet 28, 29 & 30.) On new installations, the gas lines will be filled with air and it may take several minutes to establish the pilot flame.
Keep all access doors and panels in place except for inspection and maintenance.
WARNING
THE SURFACE OF THE FURNACE IS HOT DURING OPERATION. KEEP CHILDREN, CLOTHING, FURNITURE, AND FLAMMABLE MATERIAL AWAY FROM IT.
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE LIQUIDS OR VAPORS NEAR THE FURNACE.

WARNING
DANGER OF IGNITION FLASH AND EYE INJURY OR BLINDNESS PROTECT YOUR EYES. NEVER ATTEMPT TO LIGHT PILOT WITH GAS CONTROL VALVE KNOB IN “ON” POSITION. FLASHBACK COULD OCCUR.
NOTE: Models 3508731; 3508732 are equipped with a single speed fan.
TWO-SPEED FAN OPERATION MODELS: 5008731; 5998732; 6508731; 6508732
For models equipped with WILLIAMS gas valve P322041 or P322042.
Blower will first operate at low speed then shift to high speed as the furnace heats up.
For models equipped with WILLIAMS gas valve P321704 or P321705.
Models are equipped with a two-rate control valve. The rate knob on the gas valve is marked “LO” and “HI.” Turn the rate knob to the “LO” position and the room thermostat will operate the main burner at about 70% of maximum capacity, blower will operate at low speed. Turn the rate knob to the “HI” position only when a fast heat-up is desired during extremely cold weather. High operation develops maximum capacity of the furnace, blower will first operate at low speed then shift to high speed as the furnace heats up.

SAFETY LIMIT CONTROL
These furnaces are protected against unsafe operation by five automatic safety controls: (1) A safety pilot acts to shut OFF the gas valve in case of pilot failure; (2) A redundant gas valve; (3) A limit switch shuts down the main burner to prevent overheating the furnace cabinet; (4) A vent safety shutoff device shuts down the main burner to protect against improper venting of combustion products. These limit switchs will reset when furnace cools; and (5) A thermal overload protects the motor against burnout caused by current surges or if anything should block the flow of air through the furnace. This switch will reset itself when the motor cools down and it cannot be adjusted.

IMPORTANT
KEEP BURNER AND CONTROL COMPARTMENT CLEAN.
WARNING
DANGER OF PROPERTY DAMAGE BODILY INJURY OR DEATH.
IF THE FURNACE OVERHEATS OR FAILS TO SHUT OFF, CLOSE MANUAL GAS VALVE FOR THE FURNACE BEFORE TURNING OFF ELECTRIC POWER.

–25–

FOR YOUR SAFETY, READ BEFORE LIGHTING

I WARNmINaGy: resIfulytoucaduosinngot pfroollpoewrty thedsaemaignes,trupcetirosnosnal exiancjutlryy, oar filroessorofexlipfelo,sion

A, This appliance has a pilot which must be lighted by hand. When lighting the pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS · Do not try to light any appliance or strike a match. · Do not touch any electric switch; do not use any
phone in your building. · Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.

· If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand, don’t try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion.
D_ Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

NOTES: FOR ADDITIONAL INFORMATION REFER TO THE INSTALLATION WITH THIS APPLIANCE OR CONTACT THE MANUFACTURER IDENTIFYING THE RATING PLATE, FOUND NEAR THE GAS VALVE.

AND OPERATION INSTRUCTION MANUAL SUPPLIED THE PRODUCT BY ITS MODEL NUMBER LOCATED ON

LIGHTING INSTRUCTIONS

1. STOP! Read the safety information above. 2. Set the thermostat to lowest setting. 3. Turn off all electric power to the appliance. 4. Remove control access panel. 5. Turn gas control knob clockwise( _l_to “OFF”.

POSITION –_

RESET

6. Wait five (5) minutes to clear out any gas, then smell for gas, including near the floor. If you then smell gas, stop! Follow “B” in the safety information above. If you don’t smell gas, go to next step.
7. Loosen wingnut and open pilot observation door (if equipped).

8. Find pilot–follow metal tube from gas control. The is mounted on side of burner.

9. Turn knob on gas control counterclockwise

J_to “PILOT.” 10. Push in red reset button

n
THERMO- JJ

pilot

aImll mthedeiawtealyy anlidghthotlhde in, pilot. Continue to hold

COUPIF .._

the red reset button in for about

PILOT

(1) minute after the pilot is lit. Release

BURNER

button and it will pop back up. Pilot should

remain lit. If it goes out, repeat steps 5 through 10.

· If button does not pop up when released, stop and
immediately call your service technician or gas supplier.

· If the pilot will not stay lit after several tries, turn

the gas control knob to “OFF” and call your service technician or gas supplier.

11. Close pilot observation door, tighten wingnut (if equipped).
12. Turn gas control knob counterclockwise _”_to

“ON”.

Knob can be turned to “ON” only if red reset button is up. 13. Replace control access panel.

14. Turn on all electric power to the appliance.

15. Set thermostat to desired setting.

TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting. 2. Turn off all electric power to the appliance if service is to be performed (if applicable). 3. Remove control access panel. 4. Push in gas control knob slightly and turn clockwise _ to “OFF’. Do not Force. 5. Replace control access panel.

WARNING: DUE TO HIGH SURFACE TEMPERATURES — KEEP CHILDREN, CLOTHING, FURNITURE OR ANY COMBUSTIBLE MATERIAL AWAY FROM FURNACE.
IMPORTANT: KEEP BURNER AND CONTROL COMPARTMENT CLEAN.
–26–

FOR YOUR SAFETY, READ BEFORE LIGHTING

I WARNmINaGy: resIfulytoucaduosinngot pfroollpoewrty thedsaemaignes,trupcetirosnosnal exiancjutlryy, oar filroessorofexlipfelo.sion

A. This appliance has a pilot which must be lighted by hand. When lighting the pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS · Do not try to light any appliance or strike a match. · Do not touch any electric switch; do not use any
phone in your building. · Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’a instructions,

· If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or move the selector arm, Never use tools. If the arm will not push in or move by hand, don’t try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion,
D. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

NOTES: FOR ADDITIONAL INFORMATION REFER TO THE INSTALLATION WITH THIS APPLIANCE OR CONTACT THE MANUFACTURER IDENTIFYING THE RATING PLATE, FOUND NEAR THE GAS VALVE.

AND OPERATION INSTRUCTION MANUAL SUPPLIED THE PRODUCT BY ITS MODEL NUMBER LOCATED ON

LIGHTING INSTRUCTIONS

1. STOPT Read the safety information above. 2. Set the thermostat to lowest setting. 3. Turn off all electric power to the appliance. 4. Remove control access panel. 5. From “ON” position, depress and move selector
arm on gas control to “OFF” position. Do not force.
GAS CONTROL SELECTOR ARM SHOWN IN *OFF” POSI’nON
6. Wait five minutes to clear out any gas, then smell for gas, including near the floor. If you then smell gas, stop! Follow “B” in the safety information above. If you don’t smell gas, go to next step.
7. Loosen wingnut and open pilot observation door (if equipped).

8. Find pilot–follow metal tube from gas control. The pilot is mounted on side of burner.

9. Hold lighted match at pilot burner.

THERMO_-

10. Move selector arm to

“SET” position and light
pilot. Hold in “SET” position for 1/2 minute after pilot is lit.

COUPLE _

PILOT

NOTE: Sufficient time must be allowed

BURNER

for pilot flame to heat thermocouple and hold safety magnet in locked-up position. Also, time must be allowed for air to be purged from gas lines during first starting operation.

11. Release selector arm, and if pilot remains lit, move selector arm to “ON” position.

· If the pilot will not stay lit after several tries, move the selector arm to “OFF” and call your service technician or gas supplier.

12. Close pilot observation door and tighten wingnut (if equipped).

13. Replace control access panel.

14. Turn on all electric power to the appliance.

15. Set thermostat to desired setting.

TO TURN OFF GAS TO APPLIANCE

1. Set the thermostat to lowest setting. 2. Turn off all electric power to the appliance if service is to be performed (if applicable). 3. Remove control access panel. 4. From “ON” position, depress and move selector arm on gas control to “OFF” position. Do not force. 5. Replace control access panel.

I

WARNING: DUE TO HIGH SURFACE TEMPERATURES — KEEP CHILDREN, CLOTHING, FURNITURE OR ANY COMBUSTIBLE MATERIAL AWAY FROM FURNACE.
IMPORTANT: KEEP BURNER AND CONTROL COMPARTMENT CLEAN.

II

–27–

Operating Your Furnace

ELECTRONIC IGNITION MODELS* 3508331; 3508332 5508331, 5508332
NOTE:
For models equipped with WILLIAMS gas valve P322043 or P322044 refer to this sheet and sheet 29 for “SAFETY & LIGHTING INSTRUCTION” and “TURN GAS OFF TO APPLIANCE.”
For models equipped with WILLIAMS gas valve P321897 or P321898 refer to this sheet and sheet 30 for “SAFETY & LIGHTING INSTRUCTIONS” and “TURN GAS OFF TO APPLIANCE.”
(All other models refer to sheet 25, 26 & 27.)
THE FURNACE WORKS LIKE THIS:
1. Thermostat turns on the control module.
2. Automatic relight system (in module) opens gas valve and electronically ignites pilot. After pilot flame has been established and proven by the control module, main gas valve circuit opens and pilot lights main burners.
3. Heat builds up in the furnace and starts the fan. The heated air comes out the front bottom Iouvered panel at floor level.
4. When the thermostat setting is reached, it shuts off the main burner.
5. The fan runs until the heat is removed from furnace, then it turns off.

WARNING DANGER OF IGNITION FLASH AND EYE INJURY OR BLINDNESS
PROTECT YOUR EYES. NEVER ATTEMPT TO LIGHT PILOT WITH GAS CONTROL VALVE KNOB IN “ON” POSITION. FLASHBACK COULD OCCUR.
NOTE: Models 3508331; 3508332 are equipped with a single speed fan.
TWO-SPEED FAN OPERATION MODELS: 5508331; 5508332
For models equipped with WILLIAMS gas valve P322043 or P322044.
Blower will first operate at low speed then shift to high speed as the furnace heats up.
For models equipped with WILLIAMS gas valve P321897 or P321898.
Models are equipped with a two-rate control valve. The rate knob on the gas valve is marked “LO” and “HI.” Turn the rate knob to the “LO” position and the room thermostat will operate the main burner at about 70% of maximum capacity, blower will operate at low speed. Turn the rate knob to the “HI” position only when a fast heat-up is desired during extremely cold weather. High operation develops maximum capacity of the furnace, blower will first operate at low speed then shift to high speed as the furnace heats up.

IMPORTANT
KEEP BURNER CLEAN.

AND CONTROL

COMPARTMENT

SAFETY LIMIT CONTROL
These furnaces are protected against unsafe operation by three automatic safety controls: (1) The electronic ignition system; (2) A limit switch shuts down the main burner to prevent overheating the furnace cabinet; this limit switch will reset when furnace cools; (3) A thermal overload protects the motor against burnout caused by current surges or if anything should block the flow of air through the furnace, the switch will turn the main burner off. When motor cools down, this switch will reset itself. This switch cannot be adjusted.

WARNING THE SURFACE OF THE FURNACE IS HOT DURING OPERATION. KEEP CHILDREN, CLOTHING, FURNITURE, AND FLAMMABLE MATERIAL AWAY FROM IT.
On new installations the gas lines will be filled with air and it may take several minutes to establish the pilot flame.
Keep all access doors and panels in place except for inspection and maintenance.
WARNING DANGER OF PROPERTY DAMAGE,
BODILY INJURY OR DEATH IF THE FURNACE OVERHEATS OR FAILS TO SHUT OFF, CLOSE MANUAL GAS VALVE FOR THE FURNACE BEFORE TURNING OFF ELECTRIC POWER.

–28–

FOR YOUR SAFETY, READ BEFORE LIGHTING

WARNING: If you do not follow these instructions exactly, a fire or explosion I

may result causing property damage, personal injury or loss of life.

I

A. This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the pilot by hand.
B. BEFORE LIGHTING smell around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS · Do not try to light any appliance or strike a match. · Do not touch any electric switch; do not use any
phone in your building. · Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.

· If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand, don’t try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion.
O. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

NOTES: FOR ADDITIONAL INFORMATION REFER TO THE INSTALLATION WITH THIS APPLIANCE OR CONTACT THE MANUFACTURER IDENTIFYING THE RATING PLATE, FOUND NEAR THE GAS VALVE.

AND OPERATION INSTRUCTION MANUAL SUPPLIED THE PRODUCT BY ITS MODEL NUMBER LOCATED ON

LIGHTING INSTRUCTIONS

t. STOP! Read the safety information above, 2. Set the thermostat to lowest setting. 3. Turn oft all electric power to the appliance. 4. This appliance is equipped with an ignition device which
automatically lights the pilot. Do not try to light the pilot by hand. 5. Remove control access panel. 6, Turn gas control knob clockwise( ! to “OFF”,

GAS CONTROL _

KNOBSHOWN !> F

_

.

7. Wait five (5) minutes to clear out any gas, then smell for gas, including near the floor. It you then smell gas, stop! Follow “B” in the safety information above. If you don’t
smell gas, go to next step,

8, Turn the gas control knob counterclockwise to “ON”.

_’ I

9. Replace control access panel.

10. Turn on all electric power to the appliance.

11. Turn thermostat to on (HEAT) position. Set thermostat higher than room temperature. Pilot will automatically light and main burner(s) will light in approximately 45 seconds.

NOTE: On initial start-up or after prolonged shot down, several ignition cycles may be required to purge gas lines. To accomplish the recycle – repeat steps 6 through 11 until pilot is established.
12. Set thermostat to desired setting.
13. After the room thermostat turns the system off, a delay of approximately one minute is required before the system can be turned on again.
14. If the appliance will not operate, follow the instructions “To Turn Off Gas To Appliance” and call your service technician or gas supplier.

TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting. 2. Turn off all electric power to the appliance if service is to be performed. 3. Remove control access panel.
4. Push in gas control knob slightly and turn clockwise [ _, to “OFF”. Do not Force. 5. Replace control access panel.

WARNING: DUE TO HIGH SURFACE TEMPERATURES — KEEP CHILDREN, CLOTHING, FURNITURE OR ANY COMBUSTIBLE MATERIAL AWAY FROM FURNACE.
IMPORTANT: KEEP BURNER AND CONTROL COMPARTMENT CLEAN.

–29–

FOR YOUR SAFETY, READ BEFORE LIGHTING

I WARNmINaGy: resIfulyt oucaduosinngot pfroollpoewrty thedsaemaignes,trupcetirosnosnal exiancjutlryy, oar filroessorofexlpifleo.sion

A. This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the pilot by hand.
B. BEFORE LIGHTING smell around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than sir and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS · Do not try to light any appliance or strike e match. · Do not touch any electric switch; do not use any
phone in your building. · Immediately call your gas supplier from a neighbor’s
phone, Follow the gas supplier’s instructions.

· If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or move the selector arm. Never use tools. If the arm will not push in or move by hand, don’t try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion.
D. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

NOTES: FOR ADDITIONAL INFORMATION REFER TO THE INSTALLATION WITH THIS APPLIANCE OR CONTACT THE MANUFACTURER IDENTIFYING THE RATING PLATE, FOUND NEAR THE GAS VALVE,

AND OPERATION INSTRUCTION MANUAL SUPPLIED THE PRODUCT BY ITS MODEL NUMBER LOCATED ON

LIGHTING INSTRUCTIONS

1, STOP! Read the safety information above, 2. Set the thermostat to lowest setting. 3, Turn off all electric power to the appliance. 4. This appliance is equipped with an ignition device which
automatically lights the pilot. Do not try to light the pilot by hand. 5. Remove control access panel. 6. From “ON” position, depress and move selector arm on gas control to “OFF” position, Do not force.
GAS CON’n_OL SELECTOR ARM SHOWN IN “OFF” POSI’NON

8. Move selector arm to “ON” position.
9, Replace control access panel.
10, Turn on all electric power to the appliance.
11. Turn thermostat to “ON” (HEAT) position. Set thermostat higher than room temperature. Pilot will automatically light and main burner(s) will light in approximately 45 seconds,
NOTE: On initial start-up or after prolonged shut down, several ignition cycles may be required to purge gas lines. To accomplish the recycle – repeat steps 6 through 11 until pilot is established.
12. Set thermostat to desired setting.
13. After the room thermostat turns the system off, a delay of approximately one minute is required before the system can be turned on again.
14. If the appliance will not operate, follow the instructions “To Turn Off Gas To Appliance” and call your service technician or gas supplier.

Wait five (5) minutes to clear out any gas, then smell for gas, including near the floor. If you then smell gas, stop! Follow “B” in the safety information above. If you don’t smell gas, go to next step.

TO TURN OFF GAS TO APPLIANCE

1. Set the thermostat to lowest setting. 2. Turn off all electric power to the appliance if service is to be performed. 3. Remove control access panel. 4. From “ON” position, depress and move selector arm on gas control to “OFF” 5. Replace control access panel.

position. Do not Force.

WARNING: DUE TO HIGH SURFACE TEMPERATURES — KEEP CHILDREN, CLOTHING, FURNITURE OR ANY COMBUSTIBLE MATERIAL AWAY FROM FURNACE.
IMPORTANT: KEEP BURNER AND CONTROL COMPARTMENT CLEAN.

–30–

How To Care For Your Furnace

WARNING DANGER OF BODILY INJURY OR DEATH TURN OFF ELECTRIC POWER SUPPLY AT DISCONNECT SWITCH, FUSE BOX OR SERVICE PANEL BEFORE REMOVING ANY DOORS OR ACCESS OR SERVICE PANELS FROM UNIT.
CABINET FINISH Clean cabinet with damp rag. Never use abrasive cleaners. Cabinets are finished in heat resistant baked enamel – DO NOT refinish with wall paint.
COMBUSTION AND VENTILATION AIR The combustion and ventilation air supply must not be blocked.
Do not put anything in or on the furnace cabinet.
For better circulation and more effective heating, do not place obstructive furniture closer than four feet to the front of the cabinet or two feet to the side of the cabinet.
FURNACE AREA Keep the area near the furnace clear and free from combustible materials, gasoline, and other flammable liquids and vapors.
ANNUAL UPKEEP NEEDED It is recommended that a qualified service technician perform these checks at the beginning of each heating season.
CLEANING AND OILING Shut off electricity, then remove cabinet door and front panel. Clean any lint or dirt from fan blades, fan motor, and exposed air passages. Use a brush. Put 5 drops of SAE 20 oil in each of the two cups or oil tubes on the fan motor, See Fig. 39, below.
MOTOR OIL HOLES

PILOT BURNER Light pilot using instructions in OPERATING YOUR FURNACE (on pages 25 through 30, depending on your model). Leave thermostat at lowest setting. Pilot flame should surround 3/8 to 1/2 inch of the thermocouple tip. Refer to Fig. 42, Page 32. If flame needs adjusting, do it as follows:
ADJUST PILOT BURNER (see Fig. 42, page 32) 1. Remove screw cover over pilot adjusting screw. 2. Insert small screwdriver, Adjust flame as needed. Turn
screw counterclockwise ( ) to increase flame, clockwise ( ) to decrease. 3. Turn thermostat to highest setting. Main burnersshould light quickly and smoothly. Turn thermostat to lowest setting. Main burners should go out. Pilot should remain lit except for electronic ignition models. 4. Replace screw cover over pilot adjusting screw. BURNER FLAME Start the furnace and let it operate about 10 minutes then look at the burner flame. Flames should be soft and blue, see Fig. 40. If flames appear abnormal, contact the gas company or a qualified service technician immediately. VENTING SYSTEM Make sure that no parts of the vent air system are blocked or rusted. Clean or replace before using furnace.
MAIN BURNER FLAME PATTERN
CORRECT

FAN MOTOR

OIL 1UBES OR OIL CUPS ON EACH _ND OF MOTOR

le4SUFflCiENE ENI) (_ONES

AIR

LONG

OPEN

YELtOW

IN COLOR

INNER OUTER

CONES MANTLE

LIGHT BLUE POINTED LIGHT BLUE

PROPER

FLAME

I/2

Io 3/4

HIGH

TOP

–31–

How To Care For Your Furnace (Con’t)

BURNER CLEANING

Check burner. If cleaning is required, contact a qualified service technician to clean and service burner.
WARNING DANGER OF BODILY INJURY OR DEATH MAKE SURE ELECTRIC POWER AND GAS SUPPLY ARE OFF BEFORE REMOVING PANELS OR DOORS, ETC.
CLEANING BURNER COMPARTMENT
Because cold air is attracted to the flame during furnace operation, a build up of lint from bedding and dust, etc., in the burner area will occur each heating season. It is necessary to clean this area regularly. Use a vacuum cleaner with a narrow attachment to reach small areas. Be careful in and around the pilot. A change in its adjustment could be made if struck during cleaning.
TO REMOVE BURNER(S)

Refer to “Mounting Your Furnace” section (pages 15, 16 and 17).
Check the spark gap. It must be carefully adjusted to specifications as illustrated (Fig. 42) for ignition device to function properly.
PILOT FLAME AND SPARK GAP

PILOT HOOD

· 3/8 TO 112
SENSOR SLIGHT ORANGE TIP

ELECTRODE

TYPICAL BLUE CONE –LP GAS

TYPICAL
N_TUBRLAULE CGOANSE NATURAL

BURNER CASTING

NATURAL GAS

Disconnect gas line inside cabinet.

Furnace Technical Information

MODEL NUMBER
3508732 3508731 3508332 35O8331 5008732 50O8731 5508332 5508331 6508732 6508731

TYPE GAS
NAT L.F: NAT L.I_ NAT L.P NAT L.R NAT L.P

INPUT** RATING

HI-FIRE

LO-FIRE

35,000 35,000 35,000 35,000 50,000 50,000 55,000 55,000 65,000 65,000

24,500 24,500 24,500 24,500 35,000 35,000 38,500 38,500 45,500 45,500

MAIN BURNER ORIFICE

DRILL

DEC.

QTY.

38

.1015

1

52

.0635

1

38

.1015

1

52

.0635

1

43

.089O

2

54

.0550

2

42

.0935

2

54

.O550

2

38

.1015

2

52

.0635

2

**For elevations above 2000 feet reduce ratings 4% for each 1000 feet above sea level

The efficiency rating of these appliances is a product thermal efficiency rating system determined under continuous operating conditions and was determined independently of any installed system.

m32–

Troubleshooting Chart
FOR MODELS: 3508731; 3508732; 5008731; 5008732; 6508731; 6508732

SYMPTOM
1. Pilot will not stay lit after following lighting instructions.

POSSIBLE CAUSE(S)
a. Thermocouple producing insufficient millivoltage.

CORRECTIVE ACTION
a. Check pilotflame — must impinge onthermocouple.Pilotflame may be low or blowing (high)causing safetyto drop out. Pilo_orifice or aerating hole may be plugged (check for spiders, webs or other organic material). Be sure the thermocouple is fully insertedin bracket.

b. Loose or dirty thermocouple connection at gas valve.
c. Thermocouple defective.
d. Thermomagnet pilot safety defective.

b. Clean and/or tightenthermocouplefitting at connectionto valve.
C. Check thermocouplewith millivoltmeter– shouldgenerateapproximately30 millivolts when not connected to load. When connectedto load,should generateapproximately14millivolts.If below 7 miilivolts, replace.
d. Replace gas valve after above is checked out.

e. Vent safety shutoff device.

e. Check wiringconnectionsfrom valve to vent safetyshutoffdevice. Be sure all connections are tight. Check for blocked vent.

2. Main burner will not come
ON — pilot burning and thermostat set for heat.

a. Gas valve not turned ON.
b. Electric power to furnace turned OFE

c. Low voltage transformeror limit switch defective.

d. Wall thermostat defective.
e. Burner orifice plugged. f. Gas valve defective.

a. Turngas valve knob to “ON” position — if no main gas flow, proceed to Step. “b”.
b. Check forline voltage at furnace– if okay and no main gas flow, proceed to Step “c”.
C. Check for24 volts at the lowvoltage terminals of the transformer. If no voltage,turn OFF electric power to furnace. Removeone wire from limit switch and check for continuity across both terminals. No continuity — replacelimit switch.With a good limit switchback in the circuit and the electric power turned ON — if no voltage, replace transformer. NOTE: Before replacing the transformer or limit switch, check wiring for loose connections or broken wires and repair as needed. If voltage is present at transformer, proceed to Step “d”.
d. With thermostat set for heat (contacts closed) checkfor voltage at terminals on gas valve. If no voltage is present replace defective thermostat. NOTE: Before replacing thermostat, be sure to check wiring from furnace to thermostat for loose connectionsor broken wiresand replace as needed.
If voltage is present at terminals on gas valve and still no gas flow to main burners, proceed to Step “e”.
e. Clean or replace orifice — if okay and still no gas flow to main burners, proceed to Step “f”.
f. Replace defective gas valve.

“3. Burner comes “ON” but
goes OFF before blower turns ON.

a. Defective wiring.

a. Turn OFF electric power to furnace. Remove top front panel, fan shroud and blower wheel. Refer to Wiring Diagram and check all wiring inside junction box. Remove center front panel and check all wiring inside switch box containing fan, limit and selector swit-
ches. Correct if necessary. If correct, proceed to Step “b”. NOTE: Selectorswitch used only on Models 5008731;5008732;6508731: 6508732.

b. Defective limit switch.

b. If burner goes OFF in less than five minutes from room temperature start, check limit control switch. If defective,replace. NOTE:Blower should turn “ON” within three minutes after burner
is “ON” from a room temperature start. If not, proceed to Step “c”.

*Also applicabLeto Models equipped with an electric intermittent pilot system. –33–

(continued next page)

Troubleshooting Chart
FOR MODELS: 3508731; 3508732; 5008731; 5008732; 6508731; 6508732

SYMPTOM
3. Burner comes “ON” but goes OFF before blower turns ON. (cont.)

POSSIBLE CAUSE(S) c, Defectivemotor(2-speed).

d. Defective motor (1-speed). e. Defective fan switch.

CORRECTIVE ACTION
C. Jumperacross fan switch,turnelectric powerON, motor should rotate.A 2-speedmotor is used– jumper from “brown” terminal on fan switchto #2 (red)terminalon selectorswitch, motorshould rotateon “LOW” speed. Jumperfrom same”brown” terminalon fan switchto#3 (black) terminalon selectorswitch, motorshould rotateon “HIGH” speed. Replace motor if defective.
d. Jumper across fan switch, turn electric power ON, motor should rotate. Replace motor if defective.
e. If, after checkingabove possibilities, problem still exists, replace fan switch.

*4. Burnercomes “ON”, blowe
comes “ON”, but cycles “ON” and “OFF” while
burner remains “ON”.

a. Furnace not operating at full rate.

a. Check for low gas pressure at gas valve — should be 4″ W.C.for Natural Gas, 11″ W.C. for L.R Gas. Check burner orifice.

*5. Burner comes “ON”, blower comes “ON”, but
burner cycles “OFF” and “ON” with blower “ON”.

a. Furnace operating over-rate. b. Line voltage too low.

c. Recirculation.

d. Loss of circulating air due to leakage.

“6. Furnace operates but turns “OFF” before room tem-
perature is attained.

a. Thermostat location. b. Defective thermostat.

a. Check for high gas pressure at gas valve — correctif necessary. See correct pressure above.
b. Check line voltage to motor, if below 115volts motor will run too s_ow.
C, Heated air discharging against an object causing recirculation, such as a hall installation or a large piece of furniture within 4′ of discharge.
d, Check header plate installation and proper use of gaskets. Repair as necessary.
a. Check location of thermostat. It should not be in the path of warm air discharge from furnace, near a lamp, or above a TV set or stereo.
b. Check thermostatcalibration or replace.

*7. Furnace operates but will not shut “OFF” when room
temperature is attained.

a. Thermostat wiring defective. b. Thermostat location,

*8. Abnormal operation.

c Improper thermostat anticipator setting.
a. Blower noise.

b. Expansion noise ticking,

a. Check thermostat wiringfrom furnace to thermostat — may be shorted together by a nail or staple.
b. Check thermostat location — if an outside wall or a hole in wall behind thermostatcausingcold air to contact thermostat, relocate.
C. Set anticipator per THERMOSTATANTICIPATOR, page 20.
Check motor mounts — they may be loose. Blower wheelcould be out of balance Set screw may be loose on motor shaft. Blower may be rubbing on fan shroud. Motor may need oiling. Correct as needed.
Check installation — casing may be twisted or not level at time of installation causing combustion chamber to bind on its locating pros

c. Burnerresonance.
d. Seleclor switch defective. (2-speed).
“Also applicable to Models with an electric intermittent pilot system. –34–

Usually associated with L.R Gas operation. Adjust primary air screw =nthroatof each cast iron burner after about 10 minutes of operation. Adjust to obtain a soft blue flame without streaming yellow tips,
During normal furnace operation motor will be on “LOW” speed when operatingon minimum inputcapacity and on “HIGH” speed whenoperating on maximum input capacity. Ifthere is no change in motor speed, replace selector switch.

Troubleshooting Chart
FOR MODELS: 3508331; 3508332; 5508331; 5508332

SYMPTOM

POSSIBLE CAUSE(S)

CORRECTIVE ACTION

1. No spark– no pilotgas.

a. No main powe_ b. Faulty transformer. c. Faulty thermostat. d. Faulty limit switch. e. Faulty ignition control.

f. Faulty wiring.

a.-e. Perform normalsystemchecks of main power, transformert,hermostat, limit switch, and replace faulty component.
With power ON, turn thermostatto the lowestsetting, wait 10 seconds and return to HIGH setting. With power ON and thermostat set at its highest position, set voltmeterto 24V scale and attach probes to terminals “TR” and “TH” on the ignition control unit.
If you read 24V and there still is no sparkor pilot gas, the ignition controlis defective and must be replaced.
f. Test wiring. Repair or replace.

g. Vent safety shutoffdevice.

g. Check wiring connectionsfromvalve tovent safetyshutoffdevice, be sure all connectionsare tight. Check for blocked vent.

2. Spark — but no pilot gas,

a. Faulty ignition. b. No gas supplied to pilot valve.

c. Manual valves in OFF position.
d. Faulty pilot valve. e. Faulty wiring. f. Restricted pilot line or clogged
pilot orifice.

a. See le.
b. Check for availability of gas at gas control. Makesure the manual valve (gas cock) on the gas control are in the full ON position.
No pilot gas could be caused by a plugged pilot tubing. Also check the pilot adjustment at the gas control. c. See 2b. d. See 2b.
e. See lf. f. See 2b.

3. Pil_gas–but

no spark.

a. Faulty ignitioncontrol.
b. Broken or shorted electrode assembly.

a. With power ON, turn thermostat to the lowest setting, wait 10 secondsand return 1ohigh setting With power ON and thermostat set at its highest position, set voltmeter to 24V scale and attach probes to terminals”24V” (*TH) and “GRD” (‘TR) on the ignition control unit. If you read 24V and there is still no spark or pilot gas, the ignition control is detective and must be replaced.
With thermostat turned to its highest setting, set test meter to 24Vscale. Touchprobes to “PV/MV” and “PV” terminals on Gas Valve. If you do not get a 24V reading, check wiring. If wiring tests okay, check ignition control.
Connect probesto “PV/MV” AND “PV” terminals on ignitioncontrol. If you do not read 24V,the ignition control must be replaced.
Remove wire at “PV/MV” terminal at the ignition control, being careful not to touch any metal parts; disconnect the electrode wire at the ignition control. Connect one end of a jumper wire to terminal “GND” (DO NOT REMOVE EXISTING WIRE.) Attach the other end of the jumper wire to the metal blade of a smal! screwdriver. Position end of metal blade approx. 1/8″ from terminal. Reconnect “PV/MV” terminal Sparking should occur between screwdriver blade and terminal
If no sparking occurs, the ignition control must be replaced.
Check the pilot and electrode assembly for proper electrode gap (3/32″ to 1/8″) or any possible shorting of electrode 1osurrounding metal surfaces. Make sure the spark ignitor and electrode connections to the ignition control are tight. The ignition control and pilot burner musl both be chassis ground. If there is still no spark, the pilot and electrode assembly must be replaced.

–35–

(continuednext page)

Troubleshooting Chart
FOR MODELS: 3508331; 3508332; 5508331; 5508332

SYMPTOM
4. Pilotlit,but mainburner won’t come ON.

POSSIBLE CAUSE(S) a. Faultyignitioncontrol. b. Faultywiring. c. Low pilot flame.

d. Improper alignment of sensor in pilot flame.
e. Faulty flame sensor.

CORRECTIVE ACTION
a, See 3a.
b. See if.
C. NOTE:Waitat least 90 secondsafter pilotlightsbefore doing the check out procedures for problem number 4.
With thermostatON, be sure that the pilot and sensor are properly aligned so that the pilot flame impinges the top 3/4 inch of the sensoi_Be sure that the sensor is pushed all the way into pilot bracket.Adjustpilot flame with pilot adjustment, if necessary.Also check inlet supply pressure and pilot orifice, if pilot hOOdor sensor is bent, the defective unit should be replaced.
If main burner still won’t comeON, make sure the main burner orifices are clear:.If orifices are clear, set voltmeter to 24V scale and touch probes to the terminals of the main gas operator: on the gas valve. Attach to terminal “MV”, “PV/MV” on Gas Valve. If you read 24V and the burner won’t turn ON, replace entire gas valve.
d, When main burner comesON,ensure thatthe pilot flame is strong, sensor is properly aligned,and pilot flame impingesthe top 3/4 inch of the sensor:(See procedures forcheck for proper pilot flame and alignment in problem 4c.) Check the pilot and electrode assembly for proper electrode gap (3/32″ to 1/8″) or any possible shorting of electrode to surrounding metal surfaces.Make sure the spark ignitor and electrode connections to the ignition control are tight. The ignition control and pilot burner must both be chassis ground. _fthere is still no spark, the pilot and electrode assembly must be replaced.
e. BE SURE POWER IS “OFF”, BEFORE PERFORMING THIS TEST!! Set test meter to “ohm” scale or use continuity checker. Touch one end of probes to top of flame sensor, the other to “SENSE” terminal onthe ignitioncontrol. Ohmmeter should read “0”, continuity should be evident. If you don’t obtain a reading, removewiring from sensor and test both individually, If continuity is not evident, replace wiring and/or sensor.
There should be NO continuity between sensor and “GND” terminal on the ignition control,Testingwiring and sensor individually, determine which is shorted on ground. Replace or repair. Turn ON power.

PiJot cycles OFF and ON by itself,

a. Faulty pilot valve. b. Faulty wiring.

a. See 2b. b. See lf.

Main burner shuts down
before thermostat is satisfied.

a. Low pilot flame. b. Improperalignmentof sensor in
pilot flame. c. Pilot flame being drawn away
from sensor
d. Improper heat anticipator setting.
e. Faulty limit.

a. See 4c.
b. See 4d.
C, When mainburner comes ON,ensurethat the pilot flame is strong, sensor is properly aligned and pilot flame impingesthe top 3/4 inch of the sensor. (See procedures for checking for proper pilot flame and alignment in problem 4d.) If the pilot flame is drawn away from the sensor when the main burner comes “ON”, the cause could be the manual valve is not in the full ON position or the inlet gas pressure with the main burner ON.
NOTE: Low inlet gas pressure to the gas control can be caused by several problems and is not within the scope of the procedures outlined in this service guide Consult your local utility or gas supplier:
d. See 6c. Check the setting of the heat anticipator in the wall thermostat. Set it to setting specified on the gas control.
e. The system may be cycling on a faulty limit. Using a test meter set to the 110volt scale, check for a voltage reading across the limitwhen the main burner shuts OFF.If you get a 24 volt or 110 volt reading on shutdown, replace defeclive limit switch.

–36–

Wiring Diagrams

FOR MODEL_ 3508331 ond 3508332

FOR MODELS: 5508331 and 5508332

FOR 35M B.T.U. FAN TYPE VENTED WALL FURNACE
WITH INTERMITTENT IGNITION CONTROL SYSTEM

L1
HOT

115V 80HZ FAN SWITCH

1.2
NEUT

FOR 55M B.T.U.
FAN TYPE VENTED WALL FURNACE WITH INTERMITTENT IGNITION CONTROL SYSTEM

L1 ·

115V BOHZ

_ 19

FAN _TCH

_TGPI

‘v’ 3 _

w _L COM

THERMOSTAT
TO
Z4.vV//PGvNDOO, –r-
PV O-
24V O” s_IMGsVN OOO–__

115V

SENSOR·
@
IGN
+ II

O PV (P) 7

PVA=V(c)

0 _(_0
GAS
0 VALVE

VENT
SAFETY
SHUT OFF
DE’V1CE

IN1T-,RMI3’TENTIGN. CONTROL MODULE

NOTES:

_FACTORy

—

FA_

_

L_ VOLTAGE. 1 ffanyoftheoriginaJwireassupplied

WM_£D LOW VOLTAGE.

with the appliance has to be replac-

1//4 QFAUCICTKORCYONWNIERCINTG.”I_RMINAL

e1d05, u°seCo.nlyAW1M8Gcao.,p4/p6e4rinwsuirleatioonr ,its

V4RE CONNECTOR FOR FAC’F(_Y

equivalent 115V-60Hz.-lessthan

_RO LINE VOf.TA-

3 amps.

2. MOTOR IS THERMALLY OVER-

(_ SCREW “J_E_NAL LOW _31.TAGF- LOAD PROTECTED.

115V. 60Hz – LESS THAN 3 AMPS

“n-IERMOSTAT

r_] cONV-oUR-ET

UMIT SWITCH

TRS.
r’mor ·

FLAME
SENSOR

i I_10 O
z4v/mD 0
SENS 0 —
PV 0
24V 0
Mv 0
IGN 0 —

+1 i

,,
_; PV/IV (C)
MV (M)
GAS
L VALVE

VENT SAFETY
SHUT OFF
DE_CE

IN’W.RMITW.NT IGN. CONTROL MODULE

LE_

NOTES:

m

FACTORY _

—

FACTORY _

LINE VOLTA_-. 1. Ifanyoftheoriginalwireassupplisd LOW VOLTAGE. withtheappliancehastobereplac-

I/4. QUICK CONNECT “I_UNAL FOR FACTORY V_RtNG.

ed, use only 18 Ga., 4/64 insulation, 105 ° C. AWM copper wire or its

_RE CONNECTOR FOR FACTORY equivalent 115V-60Hz.-lessthen

‘_4RINQ LINE VOLTAGE*

3 amps

2. MOTOR IS THERMALLY OVER-

SCREW/ _

LOW _OLTAGE, LOAD PROTECTED.

115V 60Hz – LESS THAN 3 AMPS.

“THERMOSTAT

_ CONV.OU’I1..ET

D D

— 2”-‘ff49T
‘= “l
_1 NTERMIT_T

SPNtK GAP
7/’G :–2- oTR ARK
uv (_)
IGNITION CONTROL MODULE SHUTVEONFTT”SDAEFVEITCYE

@ __

_1 / ELECTRODE 7/a,r –FSPA_K S_TCH

— “R–
– w–Qg- I’_ -uv(M)

BLACK

‘t/

.=i .,

_QN “1,

VENT SAFETY

Z]N’R_MIT’Jl_T IGNITIONCON_I_OLMODULESHUT OFF DEVICE

–37–

Wiring Diagrams

{:’OR MODELS: 3508731 and 3508732

FOR 35M B.T.U.

FAN TYPE VENTED WALL FURNACE

WITH CONTINUOUS PILOT CONTROL SYSTEM

u/

/_

.oq-

,sv.,z

FOR MODELS: 5008731 and 6508731 ond

5008732 6508732

FOR 50M AND 65M B.T.U. FAN TYPE VENTED WALL FURNACE WITH CONTINUOUS PILOT CONTROL SYSTEM
.z “I. T

I r _ .oTo. I

UMIT SWITCH (_TRANS.
T=,,T
I

TO THE3_MOSTAT

“IN_MOe_UPI.E

SHUTOFFDE _

LE_

I

FACTORY _

UN =’ VOLTAGE.

—

FACTORY R

LOW _3LTAGF-..

EZ] 1/’4 QIC CCT F-ORy

“i_AL

WIRE CQNNECTOR FOR FACTORy _P_NG lINE VOLTAGE.

NOTES:
1. Ifanyoftheorigina/wireassupplied wi(h the appliance hasto be replaced, useonly 18Ga.,4/64insula5on, 105 ° C, AWM copper wire or its
equivalent 115V-60Hz.-lessthan 3 amps,

_ERMJNAL

LOW VIOTAG. 2 LMOOATDOR PROISTECTTHEEDR.MALLY

OVER-

115V 60Hz – LESS THAN 3 AMPS.

THERMOSTAT

[ CONV.OU ON HEADER

TO “IHE_OSTAT

l J – BLOCK THERMOCOUPLE

VENT

__

SHUT OFF D

LIEGqD
-, FAC’RY

NOTES:
L_IE VOLTAGE.1. Itanyof theoriginalwireassupp_ied

—

FACTORY t_RIED LOW VOLTAGE.

with the appliance has to be replac-

1/’4 QU]C_ C_NNECT “RE_MINAL

ed, useonly 18 Ga., 4/64 insulation,

FACTORY ‘/RJN P

105 = C AWM copper wire or its

RE CONNECTOR FOR · IRSNG LINE VOLTAGE.
SCREW “I]B.MINAL LOW

FACTORY VOLTAGE. 2

equivalent 115V- 60Hz,- less lha_ 3 amps MOTOR IS THERMALLY OVERLOAD PROTECTED.

115V. 60Hz LESS THAN 3 AMPS.

THERMOSTAT

.] CONVO, U1LEr
-(:) ON HEADER

1

2

11t 11t

BROWN BLUE
BLOCK “I’HERMOCOUPLE VENT SAFELY SHUT oFF DEVICE

R.-

1

2

TR TH

GAS VALVE

UMIT SWITSH — BLOCKTHERMOCOUPLE

8LAOK./YELLOW (‘_ et.Aa<./”YEU.OW

VENT SAF’E–W SHUT OFF DEVlC£

–38–

Williams Top Vent Gas-Fired Wall Furnace
REPAIR PARTS FOR MODELS 3508331; 3508332; 3508731 and 3508732
CABINET and BODY ASSEMBLY

28

17 18 19 20
5

16
28
3O
33 32

35 _4

USE ONLY MANUFACTURER’S AUTHORIZED PARTS
FOR PARTS LIST SEE PAGES 41 AND 42.
–39–

Williams Top Vent Gas-Fired Wall Furnace
CONTROL ASSEMBLY FOR MODELS
3508731 and 3508732 FOR PARTS LISTING SEE PAGE 42
1
USE ONLY MANUFACTURER’S AUTHORIZED PARTS

–40–

CONTROL ASSEMBLY FOR MODELS3508331 and 3508332
FOR PARTS LISTING SEE PAGE 42

Williams Top Vent Gas-Fired Wall Furnace
REPLACEMENT PARTS LIST FOR MODELS 3508331; 3508332; 3508731 and 3508732

REF. NO.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 28 25 27 27A 28 29 28 29 30 31 32 33 34 3O 31 32 33 34 36 35

DESCRIPTION Outer Casing, Less Front Panel tnner Liner
Heating Element Bottom Front Panel Top Front Panel Fan Shroud Vent Cover Draft Hood Switch Box Center Front Panel Internal Wires (All Except Ign. Control) Header Plate Junction Box Gasket-Element Base Draft Hood Gasket Flue Collar Gasket Fan Blade Motor
Motor Support (2 Req,) Vibration Isolators (4 Req.) Transformer, 116V-24V Limit Switch Fan Switch Switch Box Cover Limit Switch Deflector Baffle Handte Header Gasket (3 Req.) Lower Element Base Angle Vent Enclosure Bide (2 Req.) _r Vent Enclosure Front - Vent Enclosure Side (2 Req.) * Vent Enclosure Front

• Rear Grille, Two-Way Plaster Ground Rear inner Boot, 10-3/4 Inches Long
• Damper Rear Outer Boot, 10 Inches Long Jr Rear Grille, Two-Way J, Plaster Ground Rear Inner Boot, 1-5/8 Inches Long Damper _, Rear Outer Boot, 7/8 Inches Long Diffusing Grille Kit Two-Way Diffusing Grilte Kil – One-Way Trip Strip Kit (Not Shown) * Oval B/W Vent Kit (Not Shown)

35O8331 12C10 12B15 12C18 12B49 12B50 12B03-1 7B12 12B12 tlB05 12C21 3508331 7B57 12B05 P026500 P107900 P027100 P300500 P322544 7B46 P022800 P024200 P309600 P200200 11C68 P321127 11C63 7A68 7Al17
9812
9824

PART NO. FOR MODEL:

3508332

3508731

12C10

12C10

12B15

12B15

12C18

12C18

12B49

12B49

12B50

12B50

12B03-1

12B03-1

7B12

7B12

12B12

12B12

tlB05

11B05

12C21

12C21

3508332

3508731

7B67

7B57

12B05

12B05

P020500

P026500

P107900

P107900

P027100

P027100

P300500

P300500

P322544

P322544

7B46

7S46

P022800

P022800

P024200

P024200

P309600

P309600

P200200

P200200

11C68

11C68

P321127

P321127

11C63

11C63

7A68

7A68

7Al17

7A117

9812

9812

9824

9824

3508732 12C10 12B15 12C18 12B49 12B50 12B0_1 7B12 12B12 11B05 12C21 3508732 7B57 12B05 P026500 P107900 P027100 P300500 P322544 7B40 P022800 P024200 P309600 P200200 11C68 P321127 11C63 7A68 7Al17
9812
9824

6801

6801

6801

6801

6802
6703 6704 4701 9901

6802
6703 8704 4701 9901

6802
6703 8704 470! 9901

6802
6703 8704 4701 9901

“_ Not available separately, in kit form only. Note: Screws and bolts are standard hardware

items, available

locally

For part illustration see pages 39 and 40 (continued on next page)

–41–

Williams Top Vent Gas-Fired Wall Furnace

REPLACEMENT PARTS FOR MODELS 3508531; 3508332; 3508731 AND 5508752

REF. NO. DESCRIPTION

PART NO. FOR MODEL:

3508331

3508332

3508731

36

Valve, WILLIAMS Nat.

Valve, WILLIAMS L.P.G.

-P322044

P322043 —

37

Manifold

12A01

12A01

38

Orifce Fitting, Specify Model & Gas

39

Locknut

P090500 P026200

P090500 P026200

40

Pilot, Cast Iron Burner, Robertshaw LP.G.

P229200

—

Pilot, Cost Iron Burner, Robertshow Net.

—

P229100

Pilot, Formed Steel Burner, Robertshaw Nat.

—

P229300

41

Junction Block Thermocouple

—

-P322042
12A01 P090500 P026200 P179800
—
P321828

41 Flame Sensor

42

Burner, Cast Iron, Nat. or L.P.G.

Burner, Formed Steel, Net. Gas Only

43

Thermostat

44

Ignition Control

45

Wire Assembly

46

Wire Assembly

47

Manifold Adopter

48

Ignition Control Shield

49

Wire Assembly (2 Required)

Ignition Control WIres (Not Shown)

NOTE: Screws ond bolts are standard hardware

P271100 P025600
-P322017 P321910 P321522 P321935 P321887
7C79 -31B036

P271100 P025600
7C52 P322017 P321910 P321522 P321935 P321887
7C79 —
31B036

items, available locally.

-P025600
-P322017
—P321888 -P321935 —

3508732 P322041
12A01 P090500 P026200
P179700 P321837
P321828 —
P025600 7C52
P322017 —-
P321888 —
P321935 —

For ports illustration see page 40.

–42–

Williams Top Vent Gas-Fired Wall Furnace
REPAIR PARTS FOR MODELS 5008731; 5008732; 5508331; 5508332; 6508731 and 6508732
CABINET and BODY ASSEMBLY

28

26

5 8
37

16
33 34 32
1·
36
39 40 41

USE ONLY MANUFACTURER’S AUTHORIZED PARTS
FOR PARTS LIST SEE PAGES 45 AND 46.
–43–

Williams Top Vent Gas-Fired Wall Furnace
CONTROL ASSEMBLY FOR MODELS
5008731 and 5008732 6508731 and 6508732 FOR PARTS LISTING SEE PAGE 46
USE ONLY MANUFACTURER’S AUTHORIZED PARTS

–441

CONTROL ASSEMBLY FOR MODELS5508331 and 5508332
FOR PARTS LISTING SEE PAGE 46

Williams Top Vent Gas-Fired Wail Furnace
REPLACEMENTPARTSFOR MODELS5008731 5008732; 5508331; 5508332; 6508731 AND 6508732

REF. NO. DESCRIPTION

PART NO. FOR MODEL: 5008731 5008732 5508331 5508332 6508731 6508732

1 Outer Casing, Less Front Panel

7055-4 7055_t 7C55-3 7C55-3 7C55-3 7C55-3

2 Inner Liner

11B46 11B46

7879

7B79

7879

7B79

3 Heating Element

7069

7C69

7C68

7C68 7C54-3 7054-3

Relief Opening Pan

7D10

7D10

7D10

7D10

7D09

7D09

5 Top Front Panel

7B126 7B126 7B126 78126

7B126

7B126

6 Center Front Panel

11060

11060

11059 11C59

11059

11059

7 Switch Box

11B05

11B05

11B05

118O5

11805

11805

8 Limit Switch

P200300 P200300 P296001 P296001 P200300 P200300

9 Selector Switch

P213400 P213400 P296201 P296201 P296201 P296201

10 Fan Switch

P200200 P200200 P200200 P2O020O P200200 P200200

11 Bottom Front Panel

11B103 11B103 11B103 11B103 11B103 118103

12 Element Base Gasket

P026500 P026500 P026500 P026500 >026500P02650C

13 Fan Shroud

78106

78106

7B106 78106

78106

78106

14 Relief Pan Gasket

=028300 P028300 P028300 P028300: P028300 P02830C

15 Vent Cover

7812

7B12

7812

7812

7B12

7812

16 Header Gasket (3 Req.)

7A68

7A68

7A68

7A68

7A68

7A68

17 Flue Collar Gasket

P027100 P027100 P027100 P027100 P027100 P027100

18 Header

7811

78114

7B57

7B57

7857

7B57

19 Limit Switch

P321127 P32t127 P321127 P321127 P321127 P321127

20 Switch Box Cover

11068

11068

11068

11068

11068

11068

21 Lower Element Base Angle

7Al17

7Al17

7Al17

7Al17

7Al17

7Al17

22 Transformer, 115V/24V

P024200 P02200 P024200 P024200 P024200 P024200

23 Junction Box

7829

7829

7B29

7829

7B29

7B29

2¢ Internal Wires (All Except Ign. ControI 5008731 5008732 5508331 5508332 6508731 6508732

25 Vibration Isolators (4 Req.)

P022800 P022800 P022800 P022800 P022800 P022800

26 Motor Support (2 Req.)

7B6

7846

7B46

7846

7846

7B46

27 Motor

P062101 P062101 P062101 P062101 P321601 P321601

28 Fan Blade

P200600 P200600 P200600 P200600 P014300 P014300

29 Deflector Baffle Handle

11063

11063

11063 11063

11063

11063

30 Vent Enclosure Side (2 Req.) 31 Vent Enclosure Front

9812

9812

9812

9812

9812

9812

30 _r Vent Enclosure Side (2 Req.) 31 “JrVent Enclosure Front

9824

9824

9824

9824

9824

9824

32 · Rear Grille, Two-Way 33 _r Rear Outer Boot, 10″ Long 3¢ _Plaster Ground
35 Rear Inner Boot, 10-3/4″ Long 36 ” Damper

6801

6801

6801

6801

32 ” Rear Grille, Two-Way 33 ’Rear Outer Boot, 7/8″ Long 34 _Plaster Ground 35 .kRear Inner Boot, 1-5/8″ Long 36 11rDamper

6802

6802

6802

6802

37 _Diffusing 37 _Diffusing

Gril]e Kit (Two-Way) Grille Kit (One-Way)

6705 6704

6705

6703

6704 i 6704

6703 6704

NOTE: Screws and bolts are standard hardware items, available locally.

“k Not available separately, in kit form only.

6801
6802 6703 6704

6801
6802 6703 6704

For parts illustration see pages 4.3 and 44.

m45–

Williams Top Vent Gas-Fired Wall Furnace

REPLACEMENT PARTS FOR MODELS 5008731; 5008732; 5508531; 5508332; 6508751 AND 6508732

REF. NO. DESCRIPTION

PART NO. FOR MODEL: 5008731 5008732 5508331

5508332

6508731 6508732

38 _ Side Inner Boot, 10-3/4″ Long 39 _rSide Outer Boot, 10″ Long 40 ,k Side Plaster Ground 41 · Side Grille

6701

6701

6701

6701

6701

6701

38 _r Side Inner Boot, 1″ Long 41 _r Side Grille

6702

6702

6702

6702

67O2

67O2

” ” Trim Strip Kit (Not Shown)

4-701

4701

4-701

4-701

4-701

4701

” Oval B/W Vent Kit (Not Shown)

9901

9901

9901

9901

9901

9901

42 Manifold

7B80

4-5 Orifice Fitting, Specify Model & Gas (2 Req.) P090500

44 Locknut (2 Req.)

P026200

7B80 P090500 P026200

7B80 P090500 P026200

7B80 P090500 P026200

7B80 P090500 P026200

7B80 P09050C P02620C

45 Valve, _LLIAMS Nat. Valve, WILLIAMS L.P.O.

P32204-1

—

P322043

P322041

P32204-2

—

P322044-

P32204-2

46 Thermostat 47 Junction Block Thermocouple

P322017 P322017 P321828 P321828

P322017 —

P322017

P322017 P322017 P321828 P321828

47 Flame Sensor

—

P271100 P271100

48 Pilot, Cast Iron Burner, Robertshow LP.G. P179800

—

P229200

P179800

Pilot, Cast Iron Burner, Robertshaw Net.

P179700

—

P229100

P179700

Pilot, Formed Steel Burner, Robertshaw Not.

P321837

—

P229300

4-9 Burner Spacer, Cast Iron Burner (2 Req.) P018!00 P018100 P018100

Burner Spacer, Formed Steel Burner (2 Req.)

P230500

—

50 Burner, Cost Iron, Nat. or L.P.G. (2 Req.) P025600 P025600 P025600

Burner, Formed Steel, Nat. Gas Only (2 Req.)

7C52

P018100 P230500 P025600
7C52

P018100 P018100 P025600 iP025600

51 Ignition Control 52 Wire Assembly 53 Wire Assembly 54- Wire Assembly (2 Req.)

P322048

—

P321910

—

P321524-

—

P32204-8

P32204-8

—

P321910
P321524 P32204-8
P322048

P32204-8

55 Manifold Adapter 56 Ignition Contro; Shield 57 Ignition Control Wires (Not Shown)

P321888

P321888 —

P321887 7C79
31B036

P321887 7C79
31B036

P321888 P321888

NOTE: Screws and bolts are standard hardware items, available locally. · ” Not available separately, in kit form only.

For parts illustration see pages 4,3 and 44.

Notes

owners manual

SERVICE

MODEL NOS.
3508331 3508332 3508731 3508732 5008731 5008732 5508331 5508332 6508731 6508732

Service Hints
If your furnace fails to work right, you may avoid inconvenience and the cost of a service call by checking the following points before you call for service.

FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

FOR YOUR SAFETY
If you smell gas: 1. Open windows. 2. Don’t touch electrical. 3. Extinguish any open flame. 4. Immediately call your gas
supplier.

POSSIBLE CAUSE

WHAT TO DO

If fan motor is noisy -Housing rattling. Fan dirty. Fan blade bent.
Motor bearings need oiling.
If fan does not run -Fuse blown or tripped circuit
breaker.
Motor bearings need oiling.

Tighten screws. Clean fan blade. Replace fan blade. Oil motor.
Replace fuse or reset breaker.
Oil motor.

If your furnace is not heating or not giving enough heat -Fuse blown or tripped circuit
breaker. Thermostat is not set correctly.
Air flow restricted.

Replace fuse or reset breaker.
Reset thermostat to desired setting.
Check that doors, drapes or furniture are not blocking furnace louvers.

If your furnace short cycles -Thermostat anticipator not set
correctly.

Set anticipator (See Page 20).

If your furnace pops and cracks —

Heat exchanger expansion and contraction,

Normal condition, especially with newer furnaces.

See troubleshooting section for more detailed information.

How to Order

When ordering repair information:
1. MODEL NUMBER 2 MFG. DATE CODE 3 PART NUMBER 4 PART DESCRIPTION

parts,

always

give the following

Repair Parts
All parts listed herein may be ordered from your equipment supplier.
The Model Number of your Williams wall furnace will be found on the rating plate near gas valve, inside control compartment.

©1998 The Williams Furnace Company

WILLIAMS FURNACE COMPANY 225 Acacia Street
Colton, CA 92324 USA
909-825-0993

Rev 6/9

Printed in U.S.A.

MANUFACTURED IN THE U.S.A.
Established 1916 FAX: 909-824-8009
P321005

References

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