Williams 1773512 User manual

WARNING: If the information in these instructions
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 or cell 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 the gas supplier, call the fire
department.
–Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
17,700 BTU/hr.
HIGH EFFICIENCY DIRECT VENT
WALL FURNACE
WARNING: This Direct Vent Wall Furnace is approved
for aftermarket manufactured home installations (once the
manufactured home is sold, installed and stationary) unless
prohibited by local codes. Not for manufactured home
manufacturer (factory) installation. Do not install this
furnaces (natural or propane gas) in trailers or
recreational vehicles.
WARNING: This product can expose you to
chemicals including epichlorohydrin which is known to
the State of California to cause cancer and birth defects
and/or other reproductive harm. For information go to
www.p65warnings.ca.gov
WARNING: Improper installation, adjustment,
alteration, service or maintenance can cause injury or
property damage. Refer to this manual. For assistance or
for additional information consult a qualified installer or,
service agency.
MODEL NUMBER (natural gas)
1773512
MODEL NUMBER (propane gas)
1773511
SAVE THIS MANUAL FOR FUTURE REFERENCE.
READ THIS OWNER’S MANUAL CAREFULLY BEFORE YOU
INSTALL YOUR NEW WILLIAMS WALL FURNACE.
250 West Laurel Street, Colton CA 92324 • WWW.WFC-FC.COM • 1-888-444-1212
TM
OWNER’S MANUAL
INSTALLATION INSTRUCTIONS
VISITEZ NOTRE SITE WEB POUR LA VERSION FRANÇAISE DE CE MANUEL
VISITE NUESTRA PÁGINA WEB PARA LA VERSIÓN EN ESPAÑOL DE ESTE MANUAL
https://www.williamscomfortprod.com/products/furnaces/

2HIGH EFFICIENCY DIRECT VENT FURNACES
INSTALLATION RECORD
Model No.. Serial No.
Original Purchaser
Address
City and State Zip
Dealer
Address
City and State Zip
Insallation Date Name Signature
(Dealer or authorized representative who certifies that this appliance is installed in accordance with Manufacturer’s instructions and local codes.)
1) Seal any unused openings in the venting system.
2) Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 or the Natural Gas
and Propane Installation Code, CSA B149.1 and
these instructions. Determine that there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
3) As far as practical, close all building doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system
are located and other spaces of the building.
4) Close fireplace dampers.
5) Turn on clothes dryers and any appliance not
connected to the venting system. Turn on
any exhaust fans, such as range hoods and
bathroom exhausts, so they are operating at
maximum speed. Do not operate a summer
exhaust fan.
WARNING: 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 poisoning or death.
The following steps shall be followed for each appliance connected to the venting system being placed into
operation, while all other appliances connected to the venting system are not in operation:
6) Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat
so appliance is operating continuously.
7) Test for spillage from draft hood equipped appliances
at the draft hood relief opening after 5 minutes
of main burner operation. Use the flame of a match
or candle.
8) If improper venting is observed during any of the
above tests, the venting system must be corrected
in accordance with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and/or Natural Gas and Propane
Installation Code, CSA B149.1.
9) After it has been determined that each appliance
connected to the venting system properly vents
when tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other
gas-fired burning appliance to their previous
conditions of use.
ANY WARRANTY CONSIDERATIONS ARE CONTINGENT ON INSTALLATION
BY A QUALIFIED INSTALLER (CONTRACTOR). SELF-INSTALLATION IS
PROHIBITED AND WILL INVALIDATE YOUR WARRANTY.

HIGH EFFICIENCY DIRECT VENT FURNACES 3
INSTALLATION RECORD
TABLE OF CONTENTS
INSTALLATIONS IN THE STATE OF MASSACHUSETTS
GENERAL INFORMATION AND TECHNICAL DATA
INSTRUCTIONS TO INSTALLER
SAFETY RULES AND GENERAL WARNINGS
SAFETY INFORMATION FOR USERS OF PROPANE GAS
PROPANE GAS WARNING ODOR
SOME POINTS TO REMEMBER
INSTALLING YOUR FURNACE
WALL INSTALLATION
OUTSIDE LOCATION FOR VENT TERMINAL
GAS CONVERSIONS
GAS SUPPLY
ELECTRICAL WIRING DIAGRAM
OPERATING INSTRUCTIONS
SERVICING YUR HEATER
ANNUAL MAINTENANCE REQUIREMENTS
PROGRAMMABLE TIMER
TROUBLESHOOTING
FURNACE ACCESSORY REPLACEMENT PARTS FOR 177 MODELS
SERVICE RECORD
CONTENTS
2
3
3
4
4
4
4
4
5
6
6
7
10
10
12
13
15
16
17
21
24
26
Quick reference,
here’s how to:
INSTALLING YOUR FURNACE
Furnace locations
OPERATING INSTRUCTIONS
Igniting your furnace for the first time.
SERVICING YOUR HEATER
Learn how to keep your new
Williams Furnace operating.
6
13
15
All installations in the State of Massachusetts must use
the following requirements when installing, maintaining
or operating direct-vent propane or natural gas-fired
space heaters.
For direct-vent appliances, mechanical-vent heating
appliances or domestic hot water equipment, where the
bottom of the vent terminal and the air intake is installed
below four feet above grade the following requirements
must be satisfied:
1. If there is not one already present, on each floor level
where there are bedroom(s), a carbon monoxide
detector and alarm shall be placed in the living area
outside the bedroom(s). The carbon monoxide detector
shall comply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall be located in the
room that houses the appliance or equipment
and shall:
a. Be powered by the same electrical circuit as the
appliance or equipment such that only one 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
INSTALLATIONS IN THE STATE
OF MASSACHUSETTS
d. Have been approved and listed by a Nationally
Recognized Testing Laboratory as recognized under
527 CMR.
A CARBON MONOXIDE DETECTOR SHALL:
a. Be located in the room that houses the appliance
or equipment;
b. Be either hard-wired or battery powered or both; and
c. Shall comply with NFPA 720 (2005 Edition).
3. A product-approved vent terminal must be used, and if
applicable, a product-approved air intake must be
used. Installation shall be in strict compliance with the
manufacturer’s instructions. A copy of the installation
instructions shall remain with the appliance or
equipment at the completion of the installation.
4. A metal or plastic identification plate shall be mounted
at the exterior of the building, four feet directly above
the location of vent terminal. The plate shall be of
sufficient size to be easily read from a distance of eight
feet away, and read “Gas Vent Directly Below”.

4HIGH 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 gas 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 propane 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.

HIGH EFFICIENCY DIRECT VENT FURNACES 5
• Close all gas tank or cylinder supply valves.
• propane 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 neighbour’s phone and call a trained propane
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.
Some Points to Remember
• Learn to recognize the odor of propane gas. Your
local propane 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 propane
gas has a weak or abnormal odor, call your propane
gas Dealer.
• If you are not qualified, do not light pilot lights,
perform service, or make adjustments to furnaces on
the propane gas system. If you are qualified, consciously
think about the odor of propane 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 propane 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 propane 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
propane gas dealer. A periodic sniff test of the propane
gas is a good safety measure under any condition.
• If, at any time, you do not smell the propane 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
propane gas.
• If you experience a complete ”gas out” (the container
is under no vapour 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 vapour 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
kW 3.96
BTU/hr. 13,500
INPUT RATING
kW 5.19
BTU/hr. 17,700
MINIMUM INPUT RATING
kW 3.84
BTU/hr. 13,100
THERMAL EFFICENCY %76.27
LENGTH
mm 553
in 21-3/4
HEIGHT
mm 715
in 28-1/8
DEPTH
mm 208
in 8-1/4
WEIGHT (OPERATING / SHIPPED)
kg 26
lbs. 57
GAS CONNECTION NPT 3/8
FEMALE
WALL HOLE DIAMETER
mm 50
in 2
AIR INLET DIAMETER
mm 49
in 1-7/8
EXHAUST PIPE DIAMETER
mm 35
in 1-3/8
MAX WALL THICKNESS
mm 150
in 5-7/8
MIN WALL THICKNESS
mm 500
in 19-5/8

6HIGH EFFICIENCY DIRECT VENT FURNACES
TECHNICAL DATA (CONTINUTED)
MANIFOLD
PRESSURE
MAX
NATURAL
GAS
mbar 7.7
in W.C. 3.1
PROPANE
GAS
mbar 26.4
in W.C. 10.6
MIN
NATURAL
GAS
mbar 4.6
in W.C. 1.8
PROPANE
GAS
mbar 16.3
in W.C. 6.6
GAS RATE
MAX
NATURAL
GAS
m3/h 0.5
ft3/h 17.8
PROPANE
GAS
m3/h 0.2
ft3/h 6.9
MIN
NATURAL
GAS
m3/h 0.4
ft3/h 13.3
PROPANE
GAS
m3/h 0.1
ft3/h 5.3
MINIMUM INLET PRESSURE
NATURAL
GAS
mbar 17.4
in W.C. 7.0
PROPANE
GAS
mbar 27.4
in W.C. 11.0
AIR FLOW
m3/h 220
cfm 129
MINIMUM AIR FLOW
m3/h 160
cfm 94
TOTAL ELECTRICAL LOAD W86
INSTALLING YOUR FURNACE
Wall Installation
Installation should be done by a QUALIFIED SERVICE
TECHNICIAN.
The furnace must be located on an outside wall.
Minimum clearances from combustible materrials:
• 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: 2-inches (50 mm)
• Unit to ceiling: 10-inches (254 mm)
See Figure 1 showing clearance for installation of vent cap.
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.
If there is a shelf above the furnace, it must be non-
combustible. A minimum clearance of 4-inches
(100 mm) is recommended between the furnace and the
non-combustible 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.
WARNING: The nearest point of the vent cap
should be a minimum horizontal distant of six (6)
feet (1,830 mm) from any pressure regulator. In case
of regulator malfunction, the six (6) feet (1,830 mm)
distance will reduce the chance of gas entering the
vent cap.
DO NOT COVER THE FURNACE.
Make sure that the correct gas supply is available.
Conversion to another gas type must be performed by
a qualified service technician. If the type of gas does not
correspond to the type to be used (natural or propane
gas), it must be converted to the correct type of gas. It is
necessary to do the following two operations:
1. Remove and change the pilot orifice with the correct
gas type as shown below.
2. Remove and change the burner orifice with the
correct gas type as shown below.
3. Remove and change the gas valve with the correct gas
type as shown below.
WARNING: For the installation of this furnace, the
following items must be used as a vent air intake system:
External Plate Part Number:WFL–STF088
External Vent Cap Part Number: WFR–12426530
Flanged Air Inlet Tube Part Number: WFR–12476500
Air Tube Gasket Part Number: WFC–12900128
Flue Outlet Tube Part Number: WFR–12476510
(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.
GAS TYPE ORIFICE PART NUMBERS GAS VALVE
NATURAL BURNER ORIFICE: JGLL051
PILOT ORFICE: JGLL064 JVL V023
PROPANE BURNER ORIFICE: JGLL070
PILOT ORFICE: J12160880 JVL V024

HIGH EFFICIENCY DIRECT VENT FURNACES 7
FIGURE 1
A. Clearance above grade, veranda, porch, deck or balcony
12-inches (30 cm) minimum. (3) see notes below
B. Clearance to window or door that may be opened
12-inches (30 cm) minimum. (3) see notes below
C. Clearance to permanently closed window (minimum
12-inches (30 cm) recommended to prevent
condensation on window.
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.
E. Clearance to unventilated soffit 12-inches (30 cm)
minimum clearance to vinyl soffit 36-inches (90 cm)
minimum.
F. Clearance to outside corner 12-inches (30 cm) minimum.
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 centreline of
the regulator. (3) see notes below
I. Clearance to service regulator vent outlet 6 feet (1.8 m)
minimum. (3) see notes below
J. Clearance to nonmechanical air supply inlet to building
or the combustion air inlet to any other furnace 12-inches
(30 cm) minimum. (3) see notes below
K. Clearance to a mechanical air supply inlet 6 feet (1.8 m)
minimum. (3) see notes below
L. Clearance (1) above paved sidewalk or a paved driveway
located on public property 7 feet (2.1 m) minimum. (3)
M. Clearance under veranda, porch, deck or balcony
12-inches (30 cm) minimum. (2), (3) see notes below
NOTES (1), (2) & (3):
1. A vent shall not terminate directly 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 two sides beneath the floor.
1 = FIXEDCLOSED 2= OPENABLE V = VENT TERMINAL A= AIR SUPPLY
3. As specified in CGA B149 installation codes (1991).
NOTE: Local codes or regulations may require different
clearances.
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 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 2-inch (50.8 mm)
diameter hole.
3. Cut the combustion exhaust and fresh air inlet tubes
according to the wall thickness Figure 2:
Air inlet tube length = wall thickness + 3/32-inches (2.4 mm)
Flue outlet tube length = wall thickness + 1-5/16-inches (7.9 mm)
4. Drill the mounting holes “A” (5 holes) in the wall. If
possible use self-tapping screws, drill 1/8-inch diameter
holes. If self-tapping screws cannot be used, drill 1/4-inch
diameter holes and use the plastic anchors provided.
5. Install the supporting bracket to the wall; insert the air
pipe in the wall through the hole provided in the support
bracket. Place the round adhesive gasket around the
hole so that the air pipe remains in position. Figure 3
6. Attach the supporting bracket with the screws. If
possible use self-tapping screws. If self-tapping screws
cannot be used, use the plastic anchors provided.
7. Loosen the screws, remove the casing and disconnect
the case grounding wire. Figure 4

8HIGH EFFICIENCY DIRECT VENT FURNACES
INSTALLING YOUR FURNACE
A + 33.3 mm A + 2.3
mm
Ø49.2
mm
H
FIGURE 2
FIGURE 3
FIGURE 4

HIGH EFFICIENCY DIRECT VENT FURNACES 9
8. Place the adhesive spongy lining behind the unit.
Figure 4
9. Attach the flue exhaust pipe end (diameter 1-3/8”)
on the furnace male pipe connection. Figure 5 BE
SURE THAT THE RUBBER SILCONE O-RING GASKET
IS IN POSITION.
10. Install the unit to the wall leaning the bottom edge
of panel “C” (where the fan is located) on the supporting
frame. Figure 6. Attach the furnace to the support
bracket with the two screws.
11. When inside installation is complete, proceed to
the location of the vent cap on the external wall. The
vent cap should perfectly match the pipe end. Mark
the location of the three holes for the screw anchors.
Figure 7 The flue grid must be vertical.
12. Remove the vent cap and drill all the necessary
holes (diameter ¼ inch for the screw fittings
provided with the furnace).
13. Relocate the vent cap and attach it with the screws.
Figure 7
14. Attach the female end of the three-prong cord to
the receptacle located near the bottom of the furnace.
15. Connect the gas supply line. A gas shutoff valve
before the furnace must be installed.
16. Reconnect the grounding wire to the casing, attach
the casing and tighten the screws.
17. Turn on gas supply and check for gas leaks with soapy
water or other suitable means on all gas connections.
Correct any gas leaks before operating the furnace.
FIGURE 5
FIGURE 6
FIGURE 7

10 HIGH EFFICIENCY DIRECT VENT FURNACES
INSTALLING YOUR FURNACE
Gas Conversions
Converting to another gas type must be performed
by a qualified service technician. If the type of the gas
supplied to the dwelling is not the same type as your
furnace (natural or propane gas), it must be converted.
It will be necessary to do the following:
1. Change nozzle.
a. Remove the screw indicated to the right.
2. Remove the nozzle assembly from the burner
inserting the screwdriver as indicated by the arrow.
3. Remove the nozzle from the support and replace it
with the correct one. Reassemble the nozzle assembly
and the screw indicated at point 1. Set the burner
pressure as indicated in the table below:
GAS TYPE NOZZLE PART NUMBERS NOZZLE DIAMETER
NATURAL P332551 0.09 in.
PROPANE P332552 0.05 in.
GAS TYPE MIN. INLET LINE
GAS PRESSURE
MAX. MANIFOLD
GAS PRESSURE
MIN. MANIFOLD
GAS PRESSURE
NATURAL 7.0 inches w.c. 3.2 inches w.c. 1.8 inches w.c.
PROPANE 11.0 inches w.c. 10.6 inches w.c. 6.5 inches w.c.
4. Check the gas pressure and settings.
MINIMUM BURNER PRESSURE SETTING
a. Set LOW burner capacity by pressing button Z2
b. Connect a micro manometer to the test gauge B
Figure 8
c. Rotate the internal screw “D” Figure 8 and set the
pressure at the correct value
MAXIMUM BURNER PRESSURE SETTING:
a. Set HI burner capacity by pressing button Z2
b. Connect a micro manometer to the test gauge B
Figure 8
c. Rotate the external screw “C” Figure 8 and set the
pressure at the correct value
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 propane gas lines please consult
propane gas supplier.
INSTALLING A NEW MAIN GAS SHUTOFF VALVE
Each furnace should have its own manual gas shutoff valve.
A manual main gas shutoff valve should be located in the
vicinity of the furnace. 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 must be
resistant to the action of propane 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. Correct all gas leaks before operating the furnace.
Never use an exposed flame to check for leaks. The
furnace must be disconnected from piping at inlet of
control valve and pipe capped or plugged for a pressure
test. Never pressure test with furnace connected; the
control valve will sustain damage!
A gas shutoff valve and ground joint union should be
installed in the gas line upstream of the gas control valve 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.
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 a test gauge connection, is
provided on the gas valve. Figure 8 - A

HIGH EFFICIENCY DIRECT VENT FURNACES 11
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).
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 5,500 feet (1680 m).
HIGH ALTITUDES CANADA ONLY
The furnace is tested according to CGA 2.17 M91 for
installation between 0 and 4,500 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 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 5,500 feet (1680 m).
HIGH ALTITUDE ADJUSTMENT
Based on the altitude of the installation site, reduce the
manifold pressure specified in the “Technical Data” chart and
as shown in the table below:
FIRST FIRING THE FURNACE
Start the furnace following the instructions given in the
“Operating Instructions”. The first lighting may 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.
Correct any gas leaks before operating the furnace.
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 acceptable. 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
correction.
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 firmly
tighten the screw of the gauge connection, then check for
gas leaks from it. Correct any gas leaks before operating the
furnace.
ALTITUDE MANIFOLD PRESSURE
REDUCTION RATE
0-2,000 FT. 0%
2,000 - 3,000 FT. 8%
3,000 - 4,000 FT. 16%
4,000 - 5,000 FT. 24%
5,000 -5,500 FT. 32%
A
B
C
D
F
E
FIGURE 8
A. Test gauge connection for gas inlet pressure
B. Test gauge connection for gas manifold pressure
C. Nut for Hi pressure adjustment (pressure regulator)
D. Screw for Lo pressure adjustment (Hi-Lo operator)
E. Electric clamp connection
F. Gas supply inlet

12 HIGH EFFICIENCY DIRECT VENT FURNACES
ELECTRICAL WIRING DIAGRAM
ELECTRICAL WIRING DIAGRAM
EV, EV1 Gas Valve 1 (Safety Shutter) Vanne Gas 1 (Securite’)
EV2 Hi-Lo Flame Operator Operateur Haute-Basse Flamme
MFan Motor Moteur du Ventilateur
M1 Overheat Thermostat Thermostat de Surchauffe
M2 Fan Thermostat Thermostat de Ventilation
M9 Mains Fuse – 5x20 size – 4A Pressostat de Circuit De Combustion
RP8 Flame Sensor Electrode de Detection de Flamme
RP7 Spark Igniter (n. 2 pcs) Electrode D’Allumage
SCombustion Blower Motor Moteur du Ventilateur de Combustion
SF Flame View Lamp (green lamp) Lampe de Presence de Flamme (Verte)
SB Lock-Out Lamp (red lamp) Lampe de Verrouillage (Rouge)
TR Current Transformer 120-24 V Transformateur 120-24 V
Z1 Reset and Summer – Winter Switch Rearmement et Bouton Ete’ - Hiver
Z2 Hi-Lo Flame and Fan Speed Switch Bouton Haute-Basse Flamme – Vitesse
Ventil.
Z3 Manual – Program Mode Switch Bouton Manuel – Programme’
Z8 Programmable Timer Interrupteur Horaire
Z9 Room Thermostat Thermostat D’Ambiance
L1 Supply Line – Live Wire Allimentation - Phase
L2 Supply Line – Neutral Wire Alimentation - Neutre
GND Supply Line – Ground Wire Alimentation - Masse

HIGH EFFICIENCY DIRECT VENT FURNACES 13
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 unit after lighting the pilot.
A. This appliance does not have a pilot which must Follow the gas supplier's instructions.
be lighted by means of the piezo igniter installed - If you cannot reach your gas supplier, call the fire
on the furnace. department.
B. BEFORE LIGHTING, smell all around the C. Do not use this appliance if any part has been under
appliance area for gas. Be sure to smell next water. Immediately call a qualified service technician
to the floor because some gas is heavier than to inspect the appliance and to replace any part of the
air and will settle on the floor. 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 Make sure the attached Lighting Instruction Tag hangs
- Do not touch any electric switch outside the heating unit after pilot has been lit.
- Do not use any phone in your building
- Immediately call your gas supplier from a neighbor's phone.
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.
OPERATING INSTRUCTIONS
1.
2.
completely. Do not force.
3. Turn off all electric power to appliance.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13. If the appliance will not operate, follow the instructions below "To Turn Off Gas Of Appliance" and call your
14.
15.
the switch back to the WINTER position (button up). The appliance will attempt to relight after
approximately 40 seconds. During these 40 seconds the red lamp will be lit. If the second attempt is
STOP! Read the safety information above on this label.
Set the thermostat to the lowest setting by turning it counterclockwise
This appliance is equipped with an ignition device that automatically lights the
burner. Do not try to light the burner by hand.
Turn off gas supply to the unit by turning off the gas shutoff valve.
Wait five minutes to clear out any gas. If you then smell gas, STOP! Follow
the safety information in section "B" above. If you do not smell gas, go to the
next step.
Turn on the gas supply to the unit.
Turn on electric power to the appliance.
Push the MIN/MAX button to MIN position (button down).
Switch the SUMMER/WINTER button to WINTER position (button up).
Set thermostat to desired setting.
The red lamp will be lit for 40 seconds, then the flame ignite. The red lamp
will then shut off and the green lamp will be lit.
service technician or gas supplier.
In case of flame fault, the red lamp will light and the green lamp will turn off. If this occurs, set the
SUMMER/WINTER button to the SUMMER position (button down) and wait ten (10) seconds; then turn
If you choose the high heat output setting, push the MIN/MAX button to MAX position (button up). If you
prefer soft heating and silent operation, keep it on MIN position (button down).
This appliance has an automatic flame control system. When the flame is lit, the green lamp is lit also.
unsuccessful, turn off the electric power to the appliance and call your Service Agency.

14 HIGH EFFICIENCY DIRECT VENT FURNACES
OPERATING INSTRUCTIONS
WHAT TO DO IF THE RED LAMP IS LIT
This appliance has an electronic flame supervision device. If the flame disappears the gas flow will be automatically
shut off and the red lamp will light instead of the green one. The appliance will attempt to relight if you do ONE of
the following:
A.
B. Turn the thermostat knob to the zero setting, then turn it back to a comfortable setting after approximately 40
seconds; OR
C. Press the SUMMER/WINTER button to the SUMMER position (button down) for approximately 40 seconds and
set it back (button up) to the WINTER position.
HOW TO SHUT OFF THE APPLIANCE
1. Turn the thermostat knob to the ZERO position.
2. Turn the I-O switch on the programmable clock to the ZERO position.
3. Turn off all electric supply to the appliance.
4. Turn the gas shutoff valve installed on the gas supply line upstream to the unit to the CLOSED position.
Turn off the electric supply to the appliance for approximately 40 seconds and turn it on again; OR
TO TURN OFF GAS TO APPLIANCE
1.
2. Turn off all electric power to the appliance if service is to be performed.
3. Turn the gas tap installed on the gas supply to the CLOSED position.
Set the thermostat to the lowest setting by turning it counterclockwise completely. Do not force.
USING THE FEATURES OF YOUR FURNACE

HIGH EFFICIENCY DIRECT VENT FURNACES 15
SERVICING YOUR HEATER
All servicing activities must be performed by a qualified
service technician 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 that are required. All servicing (except on vent system)
must be performed 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 in the HI mode.
2. Adjust the HI pressure by turning 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 a
cceptable. Readjust if needed.
6. Disconnect the test gauge and firmly tighten the screw of
the gauge connection, then check for gas leaks from it.
The HI and LO pressures must be adjusted as instructed
above. Never adjust them independently of 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 deposits 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 may be checked by examining
the burner flame. The flame may be examined through the
front flame viewer. The flame must be stable and have blue
colour. 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
these are not 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.

16 HIGH EFFICIENCY DIRECT VENT FURNACES
ANNUAL MAINTENANCE
REQUIREMENTS
1. Clean fan blades.
2. Clean air blower.
3. Check and clean silicone red pipes.
4. Check air flow switch.
5. Clean and check exhaust flue pipe and air intake pipe.
Check red O-Ring Gasket (P332612). If it is damaged, replace it.
6. Check for gas leaks on all connections.
7. Check and adjust gas pressure.
Gas inlet pressure
(pipeline)
Gas burner pressure
adjustment
Gas manifold
pressure (burner)

HIGH EFFICIENCY DIRECT VENT FURNACES 17
PROGRAMMABLE TIMER
The programmable timer allows precise operating and
timing control and is standard on this furnace. Figure 10
OVERVIEW
The programmable timer has the following features:
• Long life lithium battery
• Daily and weekly programs
• One minute minimum switching time
• Quick progression
• Sixteen programs (8 on and 8 off)
• Days of the week and hours of the day selection
• Programmable day blocks:
1-2-3-4-5 Monday - Friday
1-2-3-4-5-6 Monday - Saturday
1-2-3-4-5-6-7 Monday - Sunday
6-7 Saturday - Sunday
FIGURE 10
PROGRAMMABLE TIMER KEY
AON / OFF SWITCH
Pos. I The appliance is controlled by the room thermostat
Pos. AUTO The appliance is controlled by both the timer and the room thermostat
Pos. O The appliance is turned off
BSetting / Regulator Switch
Pos. Time setting
Pos. RUN Normal operating mode (the display shows the current time)
Pos. P Setting of programming
CProgram Selection
DDay Selection
EHours Setting
FMinutes Setting
GSKIP Button
RReset Button

18 HIGH EFFICIENCY DIRECT VENT FURNACES
Setting and Adjustment
INITIAL CONDITIONS
A. Set the Setting/Regulator switch Figure 10-B in RUN
position (centre). Press the Reset button R. The
display will flash.
B. With the Setting/Regulator switch selector in P
position (right), press the Reset button, R, the display
error EEE will appear. Move the Setting/Regulator
switch, Figure 10-B to the RUN (centre) position. The
display will disappear.
C. If the Setting/Regulator switch, Figure 10-B is moved
to position the display is frozen.
D. If the Setting/Regulator switch, Figure 10-B is moved
to RUN position the display is frozen with the
colon flashing.
E. If the Setting/Regulator switch, Figure 10-B is moved
to P position (right), the display is flashing: ,1,1.
MANUAL OPERATION
Move the On/Off switch, Figure 10-A to the I position (left).
• The symbol of a light will appear on the display.
In this condition the heater is controlled by the
furnace thermostat and is independent of the
timer program.
Move the On/Off switch, Figure 10-A to the O position (right).
• The symbol of the light on the display will
disappear. In this condition the furnace is turned off.
Move the On/Off switch, Figure 10-A to the AUTO
position (centre).
• The program function is activated. The furnace
will operate according to the programs. The furnace
is controlled both by the timer and by the furnace
thermostat.
DAY AND TIME SETTING
A. The Setting/Regulator switch, Figure 10-B is placed in
the position (left).
B. To set the day of the week, press the Day Selector
button, 1….7, Figure 10-D, a triangular shaped
indicator proceeds one day at a time. Number 1
stands for Monday, number 2 stands for Tuesday, etc.
C. To set the time press the Hour Selector button
h, Figure 10-E to set the hour and the Minutes
Selector button m, Figure 10-F to set the minutes.
The hours are set using military time.
D. After setting the day and the time move the Setting/
Regulator switch, B to the RUN position (centre). The
display is frozen and the colon is flashing.
PROGRAMMABLE TIMER
☼
☼
☼
1 2 3 4 5 6 7
0:00

1 2 3 4 5 6 7
E EE

1 2 3 4 5 6 7
0:00

1 2 3 4 5 6 7
0:00

1 2 3 4 5 6 7
0:00

☼
1
1 2 3 4 5 6 7
0:00

1 2 3 4 5 6 7
15:16

EXAMPLE:
SET WEDNESDAY, 15:16
HOURS MILITARY TIME.

HIGH EFFICIENCY DIRECT VENT FURNACES 19
PROGRAMMING THE TIMER
Sixteen settings may be programmed on the timer. Eight
odd numbers (1-3-5-7-9-11-13-15) for the ON position and
eight even numbers (2-4-6-8-10-12-14-16) for the OFF
position. Program numbers are to the left of the
symbol on the display.
A. Move the Setting/Regulator switch, Figure 10-B to
the P position (right). On the right side of the display
the number 1, 1, will appear. The ON time may now
be set.
B. Press the Day selection, 1…...7, Figure 10-D button to
the day or the block of days you want the furnace to
turn ON. Number 1 stands for Monday, etc. To set
the desired time, press the Hours Selection h, Figure
10-E button to set the hour and the Minute Selection
m, Figure 10-F button to set the minutes (for example
09:03). The time is set using military time.
C. Press the Program Selection P Figure 10-C. The
right side of the display will show a number 2 without
the light symbol. The OFF time may now be set.
D. Press the Day Setting, 1……7, Figure 11-D button to
program another day or block of days.
E. To set further programs repeat steps item B through
D above.
NOTE: When the same ON and OFF times are desired for
different days of the week, the setting procedure may be
simplified.
• 1-2-3-4-5 (from Monday through Friday)
• 1-2-3-4-5-6 (from Monday through Saturday)
• 1-2-3-4-5-6-7 (from Monday through Sunday)
• 6-7 (Saturday and Sunday)
F. To avoid undesired operation verify that the programs
do not overlap one another. You can check the
settings by pressing the Program Selection button. P
Figure 10-C
G. Move the Setting/Regulator switch to the RUN
position (center). The display will show the current day
and time.
IMPORTANT: All the programs set will be activated ONLY
the day after the setting has been carried out.
During operation, the ON status of the timer is shown on
the display with the symbol on the right end. When
the symbol does not appear, the timer is OFF.
CANCELLING A SINGLE PROGRAM
To cancel a single program:
A. Move the Setting/Regulator switch Figure 10-B to
the P Figure 10-C position (right). Press the Program
Selector P Figure 10-C button and select the
program to be cancelled.
☼
☼
☼
☼
1 2 3 4 5 6 7
0:00
1
1 2 3 4 5 6 7
0:00
☼
1
1 2 3 4 5 6 7
9:03

☼
1
1 2 3 4 5 6 7
0:00

☼
1
1 2 3 4 5 6 7
0:00

1
1 2 3 4 5 6 7
11:04

1

20 HIGH EFFICIENCY DIRECT VENT FURNACES
B. Simultaneously press the Program Selector P
Figure 10-C and SKIP button XFigure 10-G for at
least 2 seconds. The selected program will be cancelled.
C. Verification that program has been cancelled is the
continual blinking of 0:00.
CANCELLING OF ALL PRESET PROGRAMS
To cancel all the preset programs, press the Reset button,
R, for at least 2 seconds. All the preset programs will be
cancelled.
USING THE SKIP FUNCTION
To skip a program:
A. Move the Setting/Regulator switch in the RUN
position (center).
B. Press the SKIP button XFigure 10-G. The next
program will be activated as programmed. The SKIP
symbol XFigure 10-G is shown on display.
C. The SKIP command may be stopped, by pressing
the SKIP button. XFigure 10-G The preset
program will restart and SKIP symbol X Figure
10-G will disappear from the display.
SKIP FUNCTION PROCEDURE DURING OPERATION
A. The SKIP function can be activated only in RUN mode.
B. The SKIP function starts immediately after the
pressing the SKIP button, and disappears when next
program starts.
C. The SKIP function can be stopped manually by
pressing the SKIP button and the preset program
will be activated.
1 2 3 4 5 6 7
15:16

1
☼
X
1 2 3 4 5 6 7
15:16

PROGRAMMABLE TIMER