Williams 743512, 743511 User Manual
p
Natural Gas Only
Propane Gas Only
MODEL:
0743512
MODEL:
0743511
Installation Instructions and Owner’s Manual
Direct-Vent Wall Furnace
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: Installation and repair must be
done by a qualified service person. The
furnace should be inspected before use and at
least annually by a professional service
person.
WARNING: If not installed, operated and
maintained in accordance with the
manufacturer’s instructions, this
product could expose you to substances in
fuel or from fuel combustion which can cause
death or serious illness and which are known
to cause cancer, birth defects or other
re
roductive harm.
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
• 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.
Williams Furnace Co., 250 West Laurel Street, Colton, CA 92324 U.S.A.
Table of Contents
General Information and Technical Data
Instructions to Installer ………………………………………………………………………….……….................………… 1
Safety and General Warnings ………………………………………………………………….…………………...………... 2
Technical Data ……………………………………………………………………………………….…………...……………. 3
Installation
Wall Installation ………………………………………………………………………………………………………………… 4
Outside Location for Vent Terminal ………………………………………………………………… …………….…………. 5
Gas Supply ……………………………………………………………………………… ………………………….………….. 7
Operating Instructions
Operating Instructions ………………………………………………………………………………… ………….………….. 9
Servicing
Checking and Adjusting the Gas Manifold Pressure ……………………………………………… ………………….…. 10
Checking, Removing and Reassembling of the Vent – Air Intake System ………………………………………….…. 10
Lubrication of Moving Parts ……………………………………………………………………………………… ……….… 10
Flame Visual Check …………………………………………………………………… ………………………………….…. 10
Replacement Parts ………………………………………………………………………………………………………….… 11
General Information and Technical Data
This furnace is design certified to ANSI Z21.86-2004 / CSA 2.32-2004 Gas–Fired Gravity a nd 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 S afety 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 mu st
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.
1
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
an 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 LP Gas
Propane (LP Gas) is a flammable gas which can cause fires and explosions. In its natural state, propane is odorless and
colorless. 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.
LP 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.
• Close all gas tank or cylinder supply valves.
• LP Gas is heavier than air and may settle in low areas such as basements. When you have reaso n to suspect a gas
leak, keep out of basements and other low areas. Stay out until firefighters declare them to be safe.
• Use your neighbor’s phone and call a trained LP Gas service technician and the fire department. Even though you may
not continue to smell gas, do not turn on the gas again. Do not re-enter the building, vehicle, trailer or area.
• Have the service technician or fire department air out the area before you return. Properly trained LP Gas service
technician must repair the leak, check and relight the gas furnace for you.
2
Some Points to Remember
• Learn to recognize the odor of LP Gas. Your local LP Gas Dealer can give you a ”Scratch and Sniff” pamphlet. Use
it to find out what the propane odor smells like. If you suspect that your LP Gas has a weak or abnormal odor, call
your LP Gas Dealer.
• If you are not qualified, do not light pilot lights, perform service, or make adjustments to furnaces on the LP Gas
system. If you are qualified, consciously think about the odor of LP Gas prior to and while lighting pilot lights or
performing service or making adjustments.
• Sometimes a basement or a closed–up house has a musty smell that can cover up the LP Gas odor. Do not try to
light pilot lights, perform service or make adjustments in an area where the conditions are such that you may not detect
the odor if there has been a leak of LP Gas.
• Odor fade, due to oxidation by rust or absorption on walls of new 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 if they are filled and allowed to set too long before refilling. Cylinders and tanks
which have been out of service for a time may develop internal rust which will cause odor fade. If such conditions
are suspected to exist, a periodic sniff test of the gas is advisable. If you have any question about the gas odor,
call your LP Gas dealer. A periodic sniff test of the LP Gas is a good safety measure under any condition.
• If, at any time, you do not smell the LP–Gas odorant, and you should, assume you have a leak. Then take
the same immediate action recommended above for the occasion when you do smell the odorized LP Gas.
• If you experience a complete ”gas out” (the container is under no vapor pressure), turn the tank valve off immediately.
If the container valve is left on, the container may draw in some air through openings such as pilot light orifices.
If this occurs, some new internal rusting could occur. If the valve is left open, then treat the container as a new tank.
Always be sure your container is under vapor pressure by turning it off at the container before it goes completely
empty or having it refilled before it is completely empty.
Technical Data
OUTPUT HEATING CAPACITY
INPUT RATING
MINIMUM INPUT RATING
THERMAL EFFICENCY % 79.05 mbar 14.4
LENGTH
HEIGHT
DEPTH
WEIGHT
(OPERATING/SHIPPED)
GAS CONNECTION NPT
WALL HOLE DIAMETER
AIR INLET DIAMETER
EXHAUST PIPE DIAMETER
MAX WALL THICKNESS
MIN WALL THICKNESS
kW 1.71
kBTU/hr 5,850
kW 2.17 mbar 24.9
MAX
kBTU/hr 7,400
kW 1.58 mbar 5.5
kBTU/hr 5,400
mm 478
MANIFOLD PRESSURE
MIN
in 18-7/8” m
mm 577
in 22-3/4” m
MAX
mm 173
in 6-3/4” m
kg 17/20
lbs. 37/44 m3/h 0.06
GAS RATE
MIN
½”
MALE
mm 105 mbar 17.4
in 4-1/8”
MINIMUM INLET
mm 100 mbar 27.4
in 3-7/8”
PRESSURE
mm 60
in 2-3/8”
mm 495
in 19-1/2”
mm 150
in 6
NATURAL
GAS
LP
NATURAL
GAS
LP
NATURAL
GAS
LP
NATURAL
GAS
LP
NATURAL
GAS
LP
mbar
in
W.C.
in
in
in
3
10.0
W.C.
W.C.
W.C.
/h 0.20
ft3/h 7.0
3
/h 0.08
3
/h 3.0
ft
3
/h 0.14
3
/h 5.1
ft
ft3/h 2.2
in
W.C.
in
W.C.
11.0
8.7
3.5
2.2
5.8
7.0
3
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