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HIGH EFFICIENCY DIRECT VENT FURNACES

GENERAL INFORMATION AND 

TECHNICAL DATA

This furnace is design certified to ANSI Z21.86-2004 / CSA 

2.32-2004 Gas–Fired Gravity and Fan-Type, Direct-Vent 

Wall Furnaces as a Fan-Type Direct-Vent Wall Furnace 

to be installed on an outside wall according to these 

instructions.
Any alteration of the original design, installed other than 

as shown in these instructions or used with a type of gas 

not shown on the rating plate is not permitted.

Instructions to Installer

 

Installation and repair should be done by a 

QUALIFIED 

SERVICE TECHNICIAN.

The installation must conform to local codes or in the 

absence of local codes; the installation must conform to 

the National Fuel Gas Code ANSI Z223.1/NFPA 54, Natural 

Gas and propane Installation Code CSA B149.1. 
Mobile (Manufactured) home installations must conform 

with the “Manufactured Home Construction and Safety 

Standard Title 24 CFR, Part 3280” or, when such a 

standard is not applicable, the Standard for Manufactured 

Home Installations, ANSI A 225.1 NFPA/501A, Mobile Home 

Standard, CAN/CSA Z240 MH Series, in Canada.  Installer 

must leave instruction manual with home owner after 

installation.  Installer must show home owner how to 

start and operate furnace and thermostat. Installer must 

provide a 1/8-inch NPT plugged tapping for test gauge 

connection immediately upstream of the gas supply 

connection of the furnace.
During initial firing of the furnace, residual manufacturing 

grease will bake out and smoke will occur which is not 

a health danger. To prevent nuisance and operation of 

fire alarms, ventilate the room for the first two hours of 

operation.

          WARNING:

  Any change to this furnace or 

its controls can be dangerous.  This is a heating 

appliance and any panel, door or guard removed 

for servicing this furnace must be replaced prior to 

operating the furnace.

Safety Rules and General 

Warnings

DO NOT OPERATE THIS FURNACE WITHOUT FRONT 

PANEL INSTALLED

•  Due to high temperatures, the furnace should  

 

be located out of traffic and away from furniture  

 

and draperies.

•  Children and adults should be alerted to the hazards  

 

of high surface temperatures and should stay away to  

 

avoid burns or clothing ignition.

•  Young children should be carefully supervised when   

 

they are in the same room as the furnace.

•  Clothing or other flammable material should not be    

 

placed on or near the furnace.

•  Any safety screen or guard removed for servicing a    

 

furnace must be replaced prior to operating the furnace.

•  Keep burner and control compartment clean.
•  The outside vent cap is hot while furnace is in operation.
•  Installation and repair should be done by a 

QUALIFIED  

  SERVICE TECHNICIAN.

 The furnace should be  

 

 

inspected before use and at least annually by a  

 

 

qualified service technician.   

•  More frequent cleaning may be required due to  

 

 

excessive lint from carpeting, bedding materials, etc.   

 

It is imperative that control compartments, burners    

 

and circulating air passageways of the furnace be  

 

kept clean.

•  DO NOT put anything around the furnace that will    

 

obstruct the flow of combustion and ventilation air.

•  DO keep the furnace area clear and free from  

 

 

combustible materials, gasoline and other flammable  

 

vapors and liquids.

•  DO examine venting system periodically and replace   

 

damaged parts.

•  DO examine burner periodically. Clean and replace    

 

damaged parts.

•  DO NOT use this furnace if any part has been under    

 

water. Immediately call a qualified service technician   

 

to inspect the furnace and to replace any part of the    

 

control system and any gas control which has been    

 

under water.

Safety Information for Users  

of Propane Gas

Propane gas is a flammable gas which can cause fires 

and explosions. In its natural state, propane is odorless 

and colourless. You may not know all the following 

safety precautions which can protect both you and your 

family from an accident. Read them carefully now, then 

review them point by point with the members of your 

household.   Someday, when there may not be a minute 

to lose, everyone’s safety will depend on knowing exactly 

what to do. If, after reading the following information, you 

feel you still need more information, please contact your 

gas supplier.

Propane Gas Warning Odor

If a gas leak happens, you should be able to smell the gas 

because of the odorant put in the LP Gas.
That’s your signal to go into immediate action!
•  Do not operate electric switches, light matches or use  

 

your phone.  Do not do anything that could ignite the gas.

•  IMMEDIATELY get everyone out of the building,  

 

 

vehicle, trailer or area. 

Summary of Contents for 0743511

Page 1: ...stationary unless prohibited by local codes Not for manufactured home manufacturer factory installation Do not install this furnace natural or propane gas in trailers or recreational vehicles WARNING...

Page 2: ...ARNING CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poison...

Page 3: ...N OUTSIDE LOCATION FOR VENT TERMINAL GAS SUPPLY OPERATING INSTRUCTIONS SERVICING YOUR HEATER INSTALLATIONS IN THE STATE OF MASSACHUSETTS FURNACE ACCESSORY REPLACEMENT PARTS FOR 074 MODELS SERVICE RECO...

Page 4: ...stay away to avoid burns or clothing ignition Young children should be carefully supervised when they are in the same room as the furnace Clothing or other flammable material should not be placed on o...

Page 5: ...cylinders and tanks is possible Therefore people should be particularly alert and careful when new tanks or cylinders are placed in service odor fade can occur in new tanks or reinstalled old tanks i...

Page 6: ...age by a moving vehicle The vent terminal of this direct vent furnace must be located at least 9 inches 230 mm from any opening through which flue gases could enter a building The bottom of the vent t...

Page 7: ...ectly above a sidewalk or paved driveway which is located between two single family dwellings and serves both dwellings 2 Only permitted if veranda porch deck or balcony is fully open on a minimum of...

Page 8: ...6 63 5 152 4 mm FIGURE 3 FIGURE 4 FIGURE 5 SUPPORT BRACKET FURNACE WITHOUT COVER MOUNTING SLOT MOUNTING SLOT CLOSEUP LEFT MOUNTING SLOT CLOSEUP RIGHT MOUNTING SLOT SUPPORT BRACKET INSULATING SHEET UNS...

Page 9: ...llation or relocation Compounds used on threaded joints of gas piping shall be resistant to the action of propane gas The gas lines must be checked for leaks by the installer This should be done with...

Page 10: ...sure can be measured by connecting a test gauge to the connection provided on the gas valve Figure 8 A Once installation is complete the gas inlet pressure must be checked The minimum gas inlet pressu...

Page 11: ...FURNACES 11 OPERATING INSTRUCTIONS Before operating the furnace read carefully all warnings and safety information in this manual Make sure the attached lighting instructions tag hangs outside the un...

Page 12: ...Readjust if needed 6 Disconnect the test gauge and tighten firmly the screw of the gauge connection then check for gas leaks from it The HI and LO pressures must be adjusted in the way explained abov...

Page 13: ...service switch services both the appliance and the carbon monoxide detector b Have battery back up power c Meet ANSI UL 2034 Standards and comply with NFPA 720 2005 Edition and d Have been approved a...

Page 14: ...tking Candle P332497 4 Pilot Sparking Candle and Nozzle Natural Gas P332506 5 Pilot Sparking Candle and Nozzle LPG P332495 6 Piezo Electric Button P332563 7 Thermocouple P332557 8 Burner P332546 9 Pil...

Page 15: ...HIGH EFFICIENCY DIRECT VENT FURNACES 15 REPLACEMENT PARTS 1 2 7 8 3 4 5 6 9 11 12 10...

Page 16: ...074_RV 03 21 www williamscomfortprod com 888 444 1212 250 West Laurel Street Colton CA 92324 USA Subject to change without notice 2021 TM SERVICE RECORD DATE MAINTENANCE PERFORMED COMPONENTS REQUIRED...

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