Williams Furnace 0743511 User Manual
MODEL:  
Natural Gas Only  
0743512  
MODEL:  
Propane Gas Only  
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: 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.  
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.  
• 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: 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  
reproductive harm.  
Williams Furnace Co., 250 West Laurel Street, Colton, CA 92324 U.S.A.  
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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.  
•
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.  
Children and adults should be alerted to the  
hazards of high surface temperatures and should  
stay away to avoid burns or clothing ignition.  
•
•
DO NOT put anything around the furnace that will obstruct  
the flow of combustion and ventilation air.  
•
•
•
Young children should be carefully supervised  
when they are in the same room as the furnace.  
DO keep the furnace area clear and free from combustible  
materials, gasoline and other flammable vapors and  
liquids.  
Clothing or other flammable material should not be  
placed on or near the furnace.  
•
•
•
DO examine venting system periodically and replace  
damaged parts.  
Any safety screen or guard removed for servicing  
an furnace must be replaced prior to operating the  
furnace.  
DO examine burner periodically. Clean and replace  
damaged parts.  
•
•
Keep burner and control compartment clean.  
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.  
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.  
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 reason 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.  
•
•
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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  
mbar  
in W.C.  
mbar  
in W.C.  
mbar  
in W.C.  
mbar  
in W.C.  
m3/h  
ft3/h  
m3/h  
ft3/h  
m3/h  
ft3/h  
kW  
1.71  
5,850  
2.17  
8.7  
3.5  
NATURAL  
GAS  
OUTPUT HEATING CAPACITY  
INPUT RATING  
kBTU/hr  
kW  
MAX  
MIN  
24.9  
10.0  
5.5  
LP  
kBTU/hr  
kW  
7,400  
1.58  
NATURAL  
GAS  
MINIMUM INPUT RATING  
THERMAL EFFICENCY  
LENGTH  
kBTU/hr  
%
5,400  
79.05  
478  
2.2  
14.4  
5.8  
LP  
mm  
in  
18-7/8”  
577  
0.20  
7.0  
NATURAL  
GAS  
mm  
in  
HEIGHT  
DEPTH  
MAX  
22-3/4”  
173  
0.08  
3.0  
LP  
mm  
in  
6-3/4”  
17/20  
37/44  
0.14  
5.1  
NATURAL  
GAS  
kg  
WEIGHT  
(OPERATING/SHIPPED)  
m3/h  
0.06  
MIN  
lbs.  
LP  
½”  
MALE  
GAS CONNECTION  
NPT  
ft3/h  
2.2  
mm  
in  
105  
4-1/8”  
100  
mbar  
in W.C.  
mbar  
in W.C.  
17.4  
7.0  
NATURAL  
GAS  
WALL HOLE DIAMETER  
MINIMUM INLET  
PRESSURE  
mm  
in  
27.4  
11.0  
AIR INLET DIAMETER  
EXHAUST PIPE DIAMETER  
MAX WALL THICKNESS  
MIN WALL THICKNESS  
LP  
3-7/8”  
60  
mm  
in  
2-3/8”  
495  
mm  
in  
19-1/2”  
150  
mm  
in  
6
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Installation  
Installation should be done by a QUALIFIED SERVICE TECHNICIAN.  
The furnace must be located on an outside wall.  
Wall Installation  
Minimum clearances from combustible materrials:  
WARNING: For the installation of this furnace, the  
following items must be used as a vent air intake  
system:  
•
•
•
•
•
Unit to the top surface of carpeting, tile:  
2-inches (50 mm)  
Unit to back wall (0” to spacers):  
1/4-inch (6.3 mm).  
Vent to wall enclosure:  
1-inch (25.4 mm)  
Unit to sidewalls:  
External Plate  
(Part Number: WFL–STF088)  
External Vent Cap  
(Part Number: WFR–12426530)  
Flanged Air Inlet Tube  
2-inches (50 mm)  
Unit to ceiling:  
(Part Number: WFR–12476500)  
Air Tube Gasket  
10-inches (254 mm)  
(Part Number: WFC–12900128)  
Flue Outlet Tube  
See Figure 1 showing clearance for installation of vent cap.  
(Part Number: WFR–12476510)  
Leave at least three feet in front of the wall furnace for  
servicing and proper operation. The wall furnace must be  
installed in such a way that the external casing can be  
completely removed for servicing.  
(All the above items are supplied with the furnace)  
The diameter of the hole in the wall must exceed at  
least 2-inches (50 mm) the diameter of the air inlet tube.  
If there is a shelf above the furnace, it must be be  
noncombustible. A minimum clearance of 4-inches  
(100 mm) is recommended between the furnace and  
the noncombustible shelf above it.  
Gas equipment in residential garages must be installed so that all burners and burner ignition devices are located not less than  
18-inches (460 mm) above the floor. Such equipment shall be located, or protected, so it is not subject to physical damage 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 terminal and the air intake must be located at least 12-inches (300mm)  
above grade.  
DO NOT cover the furnace.  
WARNING: The nearest point of the vent cap should  
be a minimum horizontal distant of six (6) feet (1,830  
Make sure that the correct gas supply is available. Conversion  
mm) from any pressure regulator.  
In case of  
To another gas type must be performed by a qualified service  
technican. If the type of gas does not correspond to the type to  
be used (natural or LP Gas), it must be converted to the correct  
type of gas. It is necessary to do the following two operations:  
regulator malfunction, the six (6) feet (1,830 mm)  
distance will reduce the chance of gas entering the  
vent cap.  
1.  
2.  
3.  
Remove and change the pilot orifice with the correct gas type as shown below.  
Remove and change the burner orifice with the correct gas type as shown below.  
Remove and change the gas valve with the correct gas type as shown below.  
Gas Type  
Natural  
Propane (LP Gas)  
Orifice Part Numbers  
Burner Orifice: JGLL051; Pilot Orifice: JGLL064  
Burner Orifice: JGLL070; Pilot Orifice: J12160880  
Gas Valve  
JVLV023  
JVLV024  
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Figure 1  
1 = Fixed/Closed  
2 = Openable  
V = Vent Terminal  
A = Air Supply  
A. Clearance above grade, veranda, porch, deck or  
balcony 12-inches (30 cm) minimum. (3)  
K. Clearance to a mechanical air supply inlet 6 feet (1.8 m)  
minimum. (3)  
B. Clearance to window or door that may be opened 12-  
inches (30 cm) minimum. (3)  
L. Clearance (1) above paved sidewalk or a paved driveway  
located on public property 7 feet (2.1 m) minimum. (3)  
C. Clearance to permanently closed window (minimum 12- M. Clearance under veranda, porch, deck or balcony 12-  
inches (30 cm) recommended to prevent condensation  
on window.  
inches (30 cm) minimum. (2), (3)  
D. Vertical clearance to ventilated soffit located above the  
terminal within a horizontal distance of 2 feet (60 cm)  
from the centerline of the terminal 18-inches (46 cm)  
minimum.  
Notes:  
(1)  
(2)  
(3)  
A vent shall not terminate directly above a sidewalk  
or paved driveway which is located between two  
single family dwellings and serves both dwellings.  
E. Clearance to unventilated soffit 12-inches (30 cm)  
minimum clearance to vinyl soffit 36-inches (90 cm)  
minimum.  
Only permitted if veranda, porch, deck or balcony is  
fully open on a minimum of two sides beneath the  
floor.  
F. Clearance to outside corner 12-inches (30 cm)  
minimum.  
As specified in CGA B149 installation codes (1991).  
Note: Local codes or regulations may require different  
clearances.  
G. Clearance to inside corner 18-inches (46 cm) minimum.  
H. Not to be installed above a meter/regulator assembly  
within 3 feet (90 cm) horizontally from the centerline of  
the regulator. (3)  
I. Clearance to service regulator vent outlet 6 feet (1.8 m)  
minimum. (3)  
J. Clearance to nonmechanical air supply inlet to building  
or the combustion air inlet to any other furnace 12-  
inches (30 cm) minimum. (3)  
Outside Location for Vent Terminal  
Upon delivery, check to make sure the packaging has not been damaged.  
1. Remove the furnace from box/packaging taking care not to damage the paper template. This is to be used to mark the  
holes for mounting the furnace.  
2. After marking where the appropriate holes will be using the above mentioned template, make a 6-inch (152.4 mm)  
diameter hole.  
3. Cut the combustion exhaust and fresh air inlet tubes according to the wall thickness:  
Air inlet tube length = wall thickness + 11/16 in. (14.4 mm)  
F
Flue outlet tube length = wall thickness + 3 in. 9/16 (90.5 mm)  
4. Drill the mounting holes “A” (5 holes) in the wall. If the wall can receive self–tapping screws, drill 1/8-inch diameter holes.  
If not, drill 1/4-inch diameter holes and use the plastic anchors provided.  
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5. Place the insulating sheet on the support bracket and attach the bracket with insulation to the wall by tightening the five  
screws with washer. (Figure 3) Be sure the bracket is horizontal.  
6. Remove the casing from the furnace body, unscrewing the two mounting screws. (Figure 3)  
7. Mount the largest tube (diameter 4-inches (101.6 mm) and the gasket on the unit frame with the screws provided.  
Insert the smallest tube (diameter 2½-inches, 63.5 mm) in the combustion chamber. (Figure 4)  
Figure 2  
A + 17.4 mm  
A + 90.5 mm  
Figure 3  
Figure 4  
Figure 5  
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8. Position the furnace on the wall inserting the inlet/outlet flue in the hole previously drilled. Make sure that the edges of the  
support bracket perfectly match the existing holes in the back on the unit (Figure 5)  
9. Attach the furnace to the support bracket with the two screws provided. During this operation make all necessary  
adjustments to have a correct installation of the unit (Figures 5 and 6)  
10. Reinstall the external casing by tightening the relevant screws (Figure 3).  
11. On the external side of the wall, install the protection plate in such a way that the center of the hole in the plate matches  
the center of the hole in the wall. First place the plate in the right position and mark the holes on the wall. Then, remove  
the plate and drill the holes in the wall. If the wall can receive self–tapping screws, drill 1/8-inch diameter holes. If not, drill  
1/4-inch diameter holes and use the plastic anchors provided. Reposition the plate and fix it onto the wall with the four  
screws provided. (Figure 7 - Left)  
12. Mount the vent cap on the flue pipe and fix it onto the external plate with the three self–tapping screws provided. (Figure 7  
- Right)  
13. Connect the gas supply line. A gas tap just before each furnace must be installed.  
14. Turn on gas supply and check for gas leaks with soapy water or other suitable means on all gas connections.  
Figure 6  
Figure 7  
Gas Supply  
Check all local codes for requirements, especially for the size and type of gas supply line required. On natural gas lines less than  
15” (380 mm) long, use 1/2” tube; on longer runs, use 3/4” iron tube or equal. On LP gas lines please consult LP Gas supplier.  
Installing a New Main Gas Cock  
Each furnace should have its own manual gas cock. A manual main gas cock should be located in the vicinity of the unit. Where  
none exists, or where its size or location is not adequate, contact your local authorized installer for installation or relocation.  
Compounds used on threaded joints of gas piping shall be resistant to the action of LP Gas. The gas lines must be checked for  
leaks by the installer. This should be done with a soap solution watching for bubbles on all exposed connections, and if  
unexposed, a pressure test should be made.  
Never use an exposed flame to check for leaks. Furnace must be disconnected from piping at inlet of control valve and  
pipe capped or plugged for pressure test. Never pressure test with furnace connected; control valve will sustain  
damage!  
A gas valve and ground joint union should be installed in the gas line upstream of the gas control to aid in servicing. It is required  
by the National Fuel Gas Code that a drip line be installed near the gas inlet. This should consist of a vertical length of pipe tee  
connected into the gas line that is capped on the bottom in which condensation and foreign particles may collect.  
The use of the following gas connectors is recommended:  
– ANSI Z21.24 Appliance Connectors of Corrugated Metal Tubing and Fittings., CGA 6.10.  
– ANSI Z21.45 Assembled Flexible Appliance Connectors of Other Than All–Metal Construction.  
The above connectors may be used if accepted by the authorities having jurisdiction.  
Pressure Testing of the Gas Supply System  
1. To check the inlet pressure to the gas valve, a plugged tapping, accessible for test gauge connection, is provided on the  
gas valve. (Figure 8 - A).  
2. The furnace and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure  
testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).  
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3. The furnace must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any  
pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).  
Attention: If one of the above procedures results in pressures in excess of 1/2 psig (14” w.c.; 3.5 kPa) on the furnace gas valve,  
it will result in a hazardous condition.  
High Altitudes (US Only)  
For altitudes/elevations above 2,000 feet (610 m), ratings should be reduced at the rate of 4-percent for each 1,000 feet (305 m)  
above sea level by reducing the manifold pressure at 8% rate on the gas supply. Maximum altitude allowed for installation is  
5500 feet (1680 m).  
High Altitudes (Canada Only)  
The furnace is tested according to CGA 2.17 M91 for installation between 0 and 4500 ft (0 and 1370 m) altitude. For  
altitudes/elevations above 2,000 feet (610 m), ratings should be reduced at the rate of 4-percent for each 1000 feet (305 m)  
above sea level by reducing the manifold pressure at 8% rate on the gas supply. Maximum altitude allowed for installation is  
5500 feet (1680 m).  
First Firing the Furnace  
Start the furnace following the instructions given in the “Operating Instructions”. The first lighting can be difficult because of the  
air trapped in the gas lines. 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.  
Checking the Gas Inlet Pressure  
The gas inlet pressure 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 pressure must be as shown in  
“Technical Data”. After checking the gas inlet pressure, disconnect the test gauge and firmly tighten the screw of the gauge  
connection, then check for gas leaks.  
Checking the Gas Manifold Pressure  
The gas manifold pressure can be measured by connecting a test gauge to the connection provided on the gas valve. (Figure 8 -  
B). The furnace comes set from the factory at the correct manifold gas pressure. After the installation is completed, the gas  
manifold pressure must be checked both in Hi and Lo input. Turn the control knob to switch the unit from Hi to Lo input. The  
position of the knob in which this occurs depends on the actual room temperature. The gas manifold pressure must be as  
shown in “Technical Data”. Differences of plus or minus 0.1 in. w.c. are accepted. If the Hi or Lo gas manifold pressures are  
different from the values given in the “Technical Data” or are more than 0.1 in. w.c., shut off the furnace and contact a qualified  
service technician.  
For instructions about adjustment of the manifold Hi and Lo pressures, see the "Servicing” section. After checking the gas  
manifold pressure, disconnect the test gauge and tighten firmly the screw of the gauge connection, then check for gas leaks  
from it.  
Figure 8  
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Operating Instructions  
Before operating the furnace, read carefully all warnings and safety information in this manual.  
FOR YOUR SAFETY READ BEFORE OPERATING  
WARNING: If you do not follow these instructions exactly, a fire or explosion  
may result causing property damage, personal injury or loss of life.  
A. This appliance has a pilot which must be  
Follow the gas supplier’s instructions.  
- If you cannot reach your gas supplier, call the fire  
department.  
lighted by means of the piezo igniter  
installed on the unit. Do not try to light the  
pilot by hand.  
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.  
B. BEFORE LIGHTING smell all 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.  
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.  
WHAT TO DO IF YOU SMELL  
GAS:  
- Do not try to light any appliance  
- Do not touch any electric switch; Do  
not use any phone in your building  
- Immediately call your gas supplier  
from a neighbour’s phone.  
OPERATING INSTRUCTIONS  
1. STOP! Read the safety information above on this label.  
2. Turn gas control knob clockwise  
to OFF. Do not force.  
3. Wait (5) minutes to clear out any gas. If you then smell gas, STOP! Follow “B” in the  
safety information above on this label. If you don’t smell gas, go to the next step.  
4. Turn gas knob counterclockwise  
to PILOT.  
5. Look inside the flame view which is located on the external casing.  
6. Push in control knob all the way and hold in. Immediately press the piezo igniter to  
end of the stroke, then release it. Continue pressing and releasing the piezo igniter  
with the control knob pressed down, until the pilot flame appears in the flame view.  
Once the pilot flame is lit, hold the control knob in for about one (1) minute.  
7. Release knob and it will pop back up. Pilot should remain lit. If it goes out, repeat  
steps 2. trough 6. .  
- If knob does not pop up when released, stop and turn the gas tap installed on the  
gas supply line to the CLOSED position. Immediately call your service agency 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.  
8. Turn the control knob counterclockwise  
LO. The main burner flame will appear.  
to the desired setting between HI and  
TO TURN OFF GAS TO APPLIANCE  
1. Turn the control knob clockwise  
force.  
to OFF position. Do not try to switch from HI to OFF directly. Do not  
2. Turn the gas tap installed on the gas supply to the CLOSED position.  
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Servicing  
All servicing activities must be carried out by a qualified service technicial or a service agency. The home owner may not  
service the furnace. The home owner must read this section to be informed of the periodic maintenance and checks the  
required. All servicing (except on vent system) must be carried out with the external casing removed. After any servicing, the  
external casing must be reinstalled properly.  
Checking and Adjusting the Gas Manifold Pressure  
The furnace comes set from the factory at the correct HI and LO gas manifold pressures as shown in “Technical Data”. It is  
recommended to check the pressures periodically (minimum once a year). If adjustment is required, this can be done by  
adjusting screws C and D. (Figure 8) A test gauge must be connected as explained in “Checking the Gas Manifold Pressure”.  
Proceed as follows:  
1. Place the unit on and in the HI mode (knob in HI position).  
2. Adjust the HI pressure by turning the screw C (pressure regulator) to the value given in “Technical Data”. Turn clockwise  
to increase the pressure, turn counterclockwise to decrease it.  
3. Turn the control knob clockwise until the gas control switches to LO mode. The position in which this occurs depends on  
the actual room temperature.  
4. Loosen screw D until the correct value for the LO pressure is achieved. Turn clockwise to decrease the pressure, turn  
counterclockwise to increase it.  
5. Switch the unit from LO to HI mode to check that both the HI and LO pressures are correct. A tolerance of plus or minus  
0.1-inches w.c. on the pressure value is acceptable. 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 above. Never try to adjust them independently from each other.  
Checking, Removing and Reassembling of the Vent Air Intake System  
It is essential that the vent air intake system is examined periodically (minimum once a year) to verify it is clean from dust and  
deposits of solid materials such as leaves or nests. The vent air intake system is checked from outside. Proceed as follows:  
1. Remove the vent cap by removing the three outer screws. (Figure 7)  
2. Remove the inner flue pipe. Do not use tools; the pipe can be extracted by hand.  
3. Remove dust and desposits from the vent cap and flue pipes. Deposits in the air pipe must be taken outside. Do not  
push them inside the furnace. The outer air pipe may not be removed from outside.  
4. Reinstall the flue pipe from outside. Do not use glue or sealants.  
5. Reinstall the vent cap on the flue pipe. Do not use glue or sealants. Tighten the three outer screws.  
Lubrication of Moving Parts  
This furnace does not require lubrication. Do not try to lubricate any part of the furnace such as motors bearings, keys, knobs,  
screws, etc.  
Flame Visual Check  
Correct and proper operation of the burner may be checked by examinng the burner flame. The flame may be examined  
through the front flame viewer. The flame must be stable and have blue color. Some small yellow tips are acceptable with  
propane gas. If the flame is yellow or has excessive turbulence, check the gas manifold pressure and the vent air intake system.  
If all these are acceptable, call a qualified service technician for a complete check of the furnace. Call also your gas supplier to  
check the composition of the gas in use.  
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Replacement Parts  
Part Number: JVLV023  
(Natural Gas)  
Gas Valve  
Part Number: JVLV024  
(LPG)  
Part Number: J12306065  
(Sparking Candle)  
Pilot  
Sparking  
Candle and  
Nozzle  
Part Number: JGLL064  
(Nozzle – Natural Gas)  
Part Number: J12160880  
(Nozzle - LPG)  
Piezo  
Electric  
Button  
Part Number: JPZO000  
Thermocouple  
Part Number: JTRM000D  
Part Number:  
J90021028  
Burner  
Part Number:  
J12100450  
Pilot  
Pilot  
Part Number:  
Gasket  
12900043  
Part Number: JGLL051  
(Natural Gas)  
Burner  
Nozzle  
Part Number: JGLL070  
(LPG)  
11  
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