Empire Heating Systems GWT-25-3 Quick start guide

Page 1
INSTALLATION INSTRUCTIONS
AND
OWNER'S MANUAL
GRAVITY VENTED
SINGLE WALL FURNACE
MODEL
GWT-25-3(SG, RB)
GWT-35-3(SG, RB)
Installer: Leave this manual with the appliance.
Consumer: Retain this manual for future reference.
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.
WARNING: If the information in these instructions
are not followed exactly, a re or explosion may re-
sult causing property damage, personal injury or
loss of life.
— Do not store or use gasoline or other ammable
vapors and liquids in the vicinity of this or any
other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the
re department.
— Installation and service must be performed by a
qualied installer, service agency or the gas sup-
plier.

32038-1-0314Page 2
SECTION PAGE
Important Safety Information....................................................................................3
Safety Information for Users of LP Gas ...................................................................4
Introduction ..............................................................................................................5
Specications ...........................................................................................................5
Recommended Vent Conguration ..........................................................................6
Gas Supply...............................................................................................................7
Clearances ..............................................................................................................8
Ventilation and Combustion Air ................................................................................8
Location - All Models................................................................................................8
Rough-In Instructions............................................................................................8-9
Finishing Instructions ..........................................................................................9-10
Optional Thermostat Location (SG Models)...........................................................11
Lighting Instructions ...............................................................................................12
Vent Safety Shutoff System ...................................................................................13
Proper Main Burner Flame.....................................................................................13
Proper Pilot Flame .................................................................................................13
Troubleshooting......................................................................................................14
Parts List ................................................................................................................15
How To Order Repair Parts ....................................................................................15
Parts View .............................................................................................................16
Remote Bulb Control Installation Instructions ........................................................17
Optional Blower Installation Instructions ...........................................................18-21
Service Notes....................................................................................................22-23
Warranty.................................................................................................................24
TABLE OF CONTENTS

32038-1-0314 Page 3
Due to high temperatures the appliance should be
located out of trafc and away from furniture and
draperies.
• Childrenandadultsshouldbealertedtothehazards
of high surface temperatures and should stay away
to avoid burns or clothing ignition.
• Youngchildren shouldbecarefullysupervisedwhen
they are in the same room as the appliance.
• Clothing or other ammable material should not be
placed on or near the appliance.
• Any safety screen or guard removed for servicing
an appliance must be replaced prior to operating
the appliance.
• Keep burner and control compartment clean.
• Installation and repair should be done by a
QUALIFIED SERVICE PERSON. The appliance
should be inspected beforeuse and at least annually
by a qualied service person. More frequent
cleaning may be required due to excessive lint from
carpeting, bedding materials, etc. It is imperative
thatcontrol compartments, burners and circulating
air passageways of the appliance be kept clean.
• DO NOT put anything around the furnace that will
obstruct the ow of combustion and ventilation
air.
• DO keep the appliance area clear and free from
combustible material, gasoline and other ammable
vapors and liquids.
• DOexamineventing system periodically andreplace
damaged parts.
• DOmakea periodic visualcheckofpilot and burners.
Clean and replace damaged parts.
• DO NOT use this heater if any part has been under
water. Immediately call a qualied service technician
to inspect the heater and to replace any part of the
control system and any gas control which has been
under water.
• This furnace must not be connected to a chimney ue
serving a separate solid-fuel burning appliance.
THIS IS A HEATING APPLIANCE
DO NOT OPERATE THIS APPLIANCE WITHOUT OUTER CASING INSTALLED.
IMPORTANT SAFETY INFORMATION

32038-1-0314Page 4
Some people cannot smell well. Some people cannot smell the
odor of the chemical put into the gas. You must nd out if you
can smell the odorant in propane. Smoking can decrease your
ability to smell. Being around an odor for a time can affect your
sensitivity or ability to detect that odor. Sometimes other odors in
the area mask the gas odor. People may not smell the gas odor
or their minds are on something else. Thinking about smelling a
gas odor can make it easier to smell.
The odorant in LP-gas is colorless, and it can fade under some
circumstances. For example, if there is an underground leak, the
movement of the gas through soil can lter the odorant. Odorants
in LP-Gas also are subject to oxidation. This fading can occur if
there is rust inside the storage tank or in iron gas pipes.
The odorant in escaped gas can adsorb or absorb onto or into walls,
masonry and other materials and fabrics in a room. That will take
some of the odorant out of the gas, reducing its odor intensity.
LP-Gas may stratify in a closed area, and the odor intensity could
vary at different levels. Since it is heavier than air, there may be
more odor at lower levels. Always be sensitive to the slightest gas
odor. If you detect any odor, treat it as a serious leak. Immediately
go into action as instructed earlier.
Propane (LP-Gas) is a ammable gas which can cause res
and explosions. In its natural state, propane is odorless and
colorless.Youmay notknow allthe followingsafety 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.
• Learn to recognize the odor of LP-gas. Your local LP-Gas
Dealer can give you a "Scratch and Sniff" pamphlet. Use it to
nd 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 qualied, do not light pilot lights, perform service,
or make adjustments to appliances on the LP-Gas system. If
you are qualied, 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 adsorption 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 lled and allowed to set too
long before relling. 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
think you should, assume you have a leak. Then take the same
immediate action recommended above for the occasion when
you do detect the odorized LP-Gas.
• If you experience a complete "gas out," (the container is un-
der 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 orices. 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
relled before it is completely empty.
• Do not operate electric switches, light matches, use your
phone. Do not do anything that could ignite the gas.
• Get everyone out of the building, vehicle, trailer, or area. Do
that IMMEDIATELY.
• 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
reghters declare them to be safe.
• Use your neighbor's phone and call a trained LP-Gas service
person and the re 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.
• Finally, let the service man and reghters check for escaped
gas. Have them air out the area before you return. Properly
trained LP-Gas service people should repair the leak, then
check and relight the gas appliance for you.
SOME POINTS TO REMEMBER
NO ODOR DETECTED - ODOR FADE
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!
SAFETY INFORMATION FOR USERS OF LP-GAS

32038-1-0314 Page 5
Introduction
Vented wall furnace is shipped ready to install in a 2" x 4" stud wall,
with studs 16" (406mm) center to center. Always consult your local
Building Department regarding regulations, codes or ordinances
which apply to the installation of a vented wall furnace.
Instructions to Installer
1. Installer must leave instruction manual with owner after instal-
lation.
2. Installer must have owner ll out and mail warranty card sup-
plied with furnace.
3. Installer should show owner how to start and operate furnace
and thermostat.
Warning:
Any change to this furnace or its control can be dangerous.
This is a heating appliance and any panel, door or guard
removed for servicing an appliance must be replaced prior
to operating the appliance.
To conserve Gas: Turn off pilot when heater is not in use.
General Information
This series is design certied in accordance with American National
Standard / CSA Standard Z21.86 and CSA 2.32 by the Canadian
Standards Association, as a Vented Wall Furnace and must be
installed according to these instructions.
Any alteration of the original design, installed other than as
shown in these instructions or use with a type of gas not
shown on the rating plate is the responsibility of the person
and company making the change.
Important
All correspondence should refer to complete Model No., Serial No.
and type of gas.
Notice: During initial ring of this furnace, its paint will bake out and
smoke will occur. To prevent triggering of smoke alarms, ventilate
the room in which the furnace is installed.
Installation in Residential Garages
Gas utilization equipment in residential garages shall be installed
so that all burners and burner ignition devices are located not less
than 18" (457mm) above the oor.
Such equipment shall be located, or protected, so it is not subject
to physical damage by a moving vehicle.
Qualied Installing Agency
Installation and replacement of gas piping, gas utilization equipment
or accessories and repair and servicing of equipment shall be
performed only by a qualied agency. The term "qualied agency"
means any individual, rm, corporation or company which either in
person or througha representativeis engaged inand isresponsible for
(a) the installation or replacement of gas piping or (b) the connection,
installation, repair or servicing of equipment, who is experienced in
such work, familiar with all precautions required and has complied
with all the requirements of the authority having jurisdiction.
State of Massachusetts: The installation must be made
by a licensed plumber or gas tter in the Commonwealth of
Massachusetts.
The installation must conform to local codes or, in the absence of
local codes, with the National Fuel Gas Code ANSI Z223.1/NFPA
54* Natural Gas and Propane Installation Code, CSA B149.1.
*Available from the American National Standards Institute, Inc., 11
West 42nd St., New York, N.Y. 10036.
High Altitudes
For altitudes/elevations above 2,000 feet (610m), input ratings
should be reduced at the rate of 4 percent for each 1,000 (305m)
feet above sea level. Canadian High Altitudes for locations having
an elevation above mean sea level between 2,000 feet (610m) and
4,500 feet (1370m), the manifold pressure is to be decreased from
3.5" w.c. (.871kPa) to 3.0" w.c. (.747kPa) for Natural Gas and from
10.0" w.c. (2.49kPa) to 8.0" w.c. (1.992kPa) for Propane Gas.
INTRODUCTION
SPECIFICATIONS
Model GWT-25 GWT-35
Input BTU/HR (KW/H) 25,000 (7.3) 35,000 (10.3)
Height 66 1/8" (1679mm) 66 1/8" (1679mm)
Width 16" (406mm) 16" (406mm)
Depth 6" (152mm) 6" (152mm)
Gas Inlet Pipe 1/2" 1/2"
Vent Pipe Type B Oval 4" (102mm) 4" (102mm)
Accessories
Blower Kit GWTB-2 GWTB-2
Rear Register Kit GWTR-1 GWTR-1
Out-of-the-Wall Kit GWTW-2 GWTW-2
Wall Thermostat - Millivolt TMV TMV
Wireless Remote Wall Thermostat TRW TRW
Remote Bulb Thermostat GWRBT GWRBT
Attention: When the GWTW-2, Out-of-the-Wall kit is used the GWTR-1 Rear Register kit cannot be used.

32038-1-0314Page 6
Note: No vent equipment supplied with furnace.
4" Oval (all parts purchase locally)
1. Type B-1 oval pipe
2. Single story type B-1 gas vents require a baseplate and one pair of
ceiling plate spacers.
3. Multi-story type B-1 gas vents require a baseplate, one pair of ceiling
plate spacers at the rst oor ceiling and one pair of re stop spacers
at each successive ceiling level.
Type B-W gas vent pipe is available for single story or multi-
story installations. Type B-W gas vent pipe is to be used
with the Listed base plate, ceiling plate spacers and re stop
spacers.
Insulated Vent Enclosure
Gravity vented wall furnaces installed in buildings with at roofs can have poor
venting. The cold vent pipe will have a delay in proper venting and cause
the wall furnace to shut "off" by the vent safety switch. To prevent delayed
venting as well as condensation of ue products an insulated vent enclosure
is recommended.
Use Type B vent pipe and maintain at least a one inch (25mm) clearance to
combustibles.
Use metal thimble to protect vent pipe as it passes through combustibles.
Baseplate Gasket is factory installed on header. Baseplate attaches to header
with screws. B-vent snaps into and is attached to baseplate. Minimum height
of vent pipe must be six feet (1.8m) above header.
Stud space around gas vents must be free of obstructions and building paper.
Uninsulated Single-Wall Metal Pipe shall not be used outdoors in cold climates
for venting gas utilization equipment.
Attention: The main burner uses room air for combustion. As the gas/air
mixture is injected into the main burner, there is also the ow of dust and lint
particles into the main burner.
Dust and lint accumulation inside the main burner will result in a yellow main
burner ame and possible sooting inside the combustion chamber and vent pipe.
To clean main burner refer to Page 13, "Proper Main Burner Flame."
RECOMMENDED VENT CONFIGURATION

32038-1-0314 Page 7
Check all local codes for requirements, especially for the size and
type of gas supply line required.
Note: Never use plastic pipe. Check to conrm whether your local
codes allow copper tubing or galvanized.
Note: Since some municipalities have additional local codes, it is
always best to consult your local authority and installation code.
Installing a New Main Gas Cock
Each appliance 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 liqueed petroleum gases. 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 ame to check for leaks. Appliance must
be disconnected from piping at inlet of control valve and pipe
capped or plugged for pressure test. Never pressure test with
appliance 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.
Figure 1
The use of the following gas connectors is recommended:
— ANS Z21.24Appliance Connectors of Corrugated Metal Tubing
and Fittings
— ANS Z21.45Assembled FlexibleAppliance Connectors of Other
Than All-Metal Construction
The above connectors may be used if acceptable by the authority
having jurisdiction. The state of Massachusetts requires that a exible
appliance connector cannot exceed three feet in length.
Pressure Testing of the Gas Supply System
1. To check the inlet pressure to the gas valve, a 1/8" (3.175mm)
N.P.T. plugged tapping, accessible for test gauge connection,
must be placed immediately upstream of the gas supply
connection to the appliance.
2. Theapplianceandits individualshutoffvalvemustbedisconnected
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 appliance must be isolated from the gas supply pipingsystem
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 procedures results in pressures in excess
of 1/2 psig (14" w.c.) (3.5 kPa) on the appliance gas valve, it will
result in a hazardous condition.
Checking Manifold Pressure
Both Propane and Natural gas valves have a built-in pressure
regulator in the gas valve. Natural gas models will have a manifold
pressure of approximately 3.5" w.c. (.871kPa) at the valve outlet
with the inlet pressure to the valve from a minimum of 4.5" w.c.
(1.120kPa) for the purpose of input adjustment to a maximum of
10.5" w.c. (2.614kPa) Propane gas models will have a manifold
pressure approximately 10.0" w.c. (2.49kPa) at the valve outlet
with the inlet pressure to the valve from a minimum of 11.0" w.c.
(2.739kPa) for the purpose of input adjustment to a maximum of
13.0" w.c. (3.237kPa).
A 1/8" (3.175mm) N.P.T. plugged tapping, accessible for test gauge
connection, is located on the outlet side of the gas control.
GAS SUPPLY
Recommended Gas Pipe Diameter
Pipe Length Schedule 40 Pipe
Inside Diameter
Tubing, Type L
Outside Diameter
Nat. L.P. Nat. L.P.
0-10 feet
0-3 meters
1/2”
12.7mm
3/8”
9.5mm
1/2”
12.7mm
3/8”
9.5mm
10-40 feet
4-12 meters
1/2”
12.7mm
1/2”
12.7mm
5/8”
15.9mm
1/2”
12.7mm
40-100 feet
13-30 meters
1/2”
12.7mm
1/2”
12.7mm
3/4”
19mm
1/2”
12.7mm
100-150 feet
31-46 meters
3/4”
19mm
1/2”
12.7mm
7/8”
22.2mm
3/4”
19mm

32038-1-0314Page 8
1. In selecting a location for installation, it is necessary to provide
adequate accessibility clearances for servicing and proper
installation.
2. Clearances to combustible surfaces are 4" (102mm) from sides,
12" (305mm) to top, 1 1/2" (38mm) from oor.
NOTE: Minimum distance of 1 1/2" (38mm) must also be maintained
from top surface of carpeting, tile, etc.
Wall furnaces shall be installed in a location in which the facilities
for ventilation permit satisfactory combustion of gas and proper
venting under normal conditions. In buildings of conventional frame,
brick, or stone construction without tight storm windows and doors,
inltration is normally adequate to provide air for combustion and
draft hood dilution.
Where appliances are installed in conned and unconned spaces
within a building, the building being of unusually tight construction,
air for combustion and ventilation must be obtained directly from
outdoors or from such spaces that freely communicate with the
outdoors. Under these conditions, the conned and unconned
spaces shall be provided with two permanent openings, one near
the top of the enclosure and one near the bottom; each opening
shall have a free area of not less than one square inch (6.45cm2)
per 2,000 BTU (.6KW/H) per hour of total input.
Select a location near the center of the space to be heated. Overow
heat will circulate through doorways into adjacent rooms.
For large homes or spread-out oor plans, two or more furnaces are
recommended. Do not locate furnace where a door could swing
over the outer casing, or where circulation could be retarded by
furniture or cabinets.
Do not install in a closet, alcove or small hallway where the furnace
could be isolated by closing doors to the heated space.
When location is selected, checkthe walls, attic and roofto make sure
there are no obstructions such as pipes, electric wiring, etc., which
would interfere with the installation of the furnace or vent pipe.
NOTE: If Rear Register Kit is to be used, see Rear Register Kit
instructions for location of hole in rear wall. Register outlet
must be cut in wall before furnace is installed.
NOTE: If Optional Blower is to be used, hard wiring must be
completed for the optional blower prior to installation of
header plate.
Provide an opening in the wall 14 1/2" (368mm) wide and 66 1/8"
(168cm) high measured from top of oor plate (See Figure 2 and
Figure 3). Wall depth is to be 2" x 4" framing with 1/4" (6.5mm) to
5/8" (16mm) sheeting.Attach baseplate (not supplied with furnace) to
header plate with sheet metal screws ateach end.Attach 4" (102mm)
oval, double wall vent pipe to baseplate.Attach enough vent pipe so
that when installed in wall opening the vent pipe will extend above the
ceiling plate by at least 6" (152mm). Install ceiling spacers according
to manufacturer's instructions. Insert header plate with attached 4"
oval, double wall vent pipe into wall opening. Position header plate
at height shown in Figure 2. Locate rear edge of nailing ange at
the back of the 2" x 4" stud which will center the vent collar in the
wall. Locate the angled edge of header plate ush with the top of
the wall opening. Nail header plate to the wall studs.
CLEARANCES
VENTILATION AND COMBUSTION AIR
LOCATION - ALL MODELS
ROUGH-IN INSTRUCTIONS

32038-1-0314 Page 9
62 1/4”
(1581 mm)
14 ½”
(368 mm)
Figure 2
66 1/8”
(1679mm)
WALL
OPENING
Figure 3
Plastering (Figure 4)
In new construction use only plain (not perforated) gypsum lath
around furnace and vent pipe so that plaster "Keys" will not project
into wall space.
Use wood strips nailed to inside of studs and top of bottom plate.
These must be removed before installation of furnace. Lath and
plaster against top projection of Header Plate.
Do not allow wall nish materials to project into furnace recess.
66 1/8”
(1679mm)
WALL
OPENING
14 ½”
(368 mm)
Figure 4
Installing Furnace (Figure 5)
Clear the recess of all debris, and remove any woodplaster-grounds.
Stand the furnace on oor in front of wall opening.
Insert furnace ue into rectangular opening in header plate and
raise furnace carefully (see Figure 5). Swing bottom of furnace into
wall opening with back of legs ush with rear of oor plate. Secure
furnace support legs to the oor plate.
Figure 5
FINISHING INSTRUCTIONS

32038-1-0314Page 10
Figure 6
IMPORTANT — Avoid securing too tightly and disturbing the inner
casing. Do not try to force furnace into a wall opening which is
smaller than specied dimension.
OUTER CASING (Figure 6)
1. Align 1 3/4" slot on casing bracket with bottom screw hole on
inner casing. Attach casing bracket to inner casing with one (1)
10 x 1/2" screws for each casing bracket. Do not completely
tighten screws at this time.
2. Place outer casing onto header.
Attention: Use center clearance hole on outer casing top for
attachment to header with one (1) 8 x 3/8" Phillips screw when
optional blower is not installed.
Attention: Use outside clearance holes on outer casing top
for attachment to header with two (2) 8 x 3/8" Phillips screws
when optional blower is installed.
3. Align clearance holes on outer casing bottom with screw holes
on casing brackets by adjusting slots on casing brackets.
4. Complete tightening casing bracket screws from Step 1 to inner
casing at this time.
5. Attach outer casing to casing brackets with two (2) 10 x 1-1/2"
screws.
INSTALLING CONTROL DOOR
Attach two washers supplied in hardware package to pivot pins
located at bottom of control door. Install control door to outer cas-
ing assembly.
FINISHING INSTRUCTIONS (continued)

32038-1-0314 Page 11
CAUTION — Do not run wire behind anges of Header Plate or in
any location where it might be damaged.
Millivolt wall thermostats are specially designed for use on self-
generating systems. They should never be used on line or low
voltage A.C. circuits.
Interior Wall — The thermostat should be installed on an inside
wall away from the furnace but in the same room.
It is important to use wire of a gauge proper for the length of the
wire:
RECOMMENDED WIRE GAUGES
Maximum Length Wire Gauge
1' to 10' 18
10' to 25' 16
25' to 35' 14
Proper operation depends on a good pilot ame. The ame must
cover the top of the thermopile. Cleaning of the pilot orice and
burner may be required due to spiders.
System Check (Figure 7)
A millivolt meter is required to check the system. Millivolt readings
should be:
• Across the thermopile terminals, 400-450 millivolts with
thermostat OFF.
• Across the thermopile terminals, 150-250 millivolts with
thermostat ON.
• Across the thermostat wires at the valve, less than 30 millivolts
with thermostat ON.
• Across the thermostat wires at the thermostat, less than 5
millivolts with thermostat ON. (Dirty pilot or low pressure will
reduce readings.)
Connect thermostat wires to gas valve as shown in Figure 7.
To conserve Gas: Turn off pilot when heater is not in use.
Figure 7
OPTIONAL THERMOSTAT LOCATION (SG MODELS)

32038-1-0314Page 12
1. Set the thermostat to lowest setting.
2. Turn off all electric power (if applicable) to appliance if
service is to be performed.
3. Remove control access panel (control door).
4. Push in gas control knob slightly and turn clockwise
to "OFF." Do not force.
5. Replace control access panel (control door).
1. STOP! Read the safety information above.
2. Set the thermostat to lowest setting (if applicable).
3. Turn off all electric power to the appliance (if applica-
ble).
4. Remove control access panel (control door).
5. Push in gas control knob slightly and turn clockwise
to "OFF."
NOTE: Knob cannot be turned from "PILOT" to "OFF" unless
knob is pushed in slightly. Do not force.
6. Wait ten (10) minutes to clear out any gas. Then smell
for gas, including near the oor. If you smell gas, STOP!
Follow "B" in the safety information above. If you don't
smell gas, go to the next step.
7. Find pilot - follow metal tube from gas control. The pilot
is mounted on front of main burner.
8. Turn gas control knobcounterclockwise
to "PILOT."
9. Push in control knob all the way and
hold in. Immediately light the pilot with
a match. Continue to hold the control
knob in for about one (1) minute after
the pilot is lit. Release knob and it will pop back up. Pilot
should remain lit. If it goes out, repeat steps 5 through
9.
• If knob does not pop up when released, stop and im-
mediately call a qualied service technician or gas
supplier.
• If the pilot will not stay lit after several tries, turn
the gas control knob to "OFF" and call your service
technician or gas supplier.
10. Turn gas control knob counterclockwise to
"ON."
11. Replace control access panel (control door).
12. Turn on all electric power to the appliance (if applica-
ble).
13. Set thermostat to desired setting (if applicable).
GAS CONTROL KNOB SHOWN IN "OFF" POSITION
LIGHTING INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not follow these instructions exactly, a re or explosion may result
causing property damage personal injury or loss of life.
A. This appliance has a pilot which must be lighted by
hand. When lighting the pilot, follow these instructions
exactly.
B. BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the oor because some
gas is heavier than air and will settle on the oor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your building.
• Immediatelycallyour gassupplier from aneighbor's
phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the re
department.
C. Use only your hand to push in or turn the gas control
knob. Never use tools. If the knob will not push in or
turn by hand, don't try to repair it; call a qualied service
technician. Force or attempted repair may result in a re
or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualied service technician to inspect
the appliance and to replace any part of the control system
and any gas control which has been under water.
LIGHTING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE

32038-1-0314 Page 13
This appliance must be properly connected to a venting system.
This appliance is equipped with a vent safety shutoff system.
Warning: Operation ofthis wallfurnace whennotconnected
to a properly installed and maintained venting system or
tampering with the vent safety shutoff system can result in
carbon monoxide (CO) poisoning and possible death.
This furnace is equipped with a manual reset vent safety switch.
The manual reset vent safety switch will cause gas ow to the main
burner to "shut off" due to improper venting or a blocked ue.
To reset the manual reset vent safety switch:
1. Remove outer casing.
2. Depress manual reset button. The manual reset vent safety
switch is located on the draft diverter.
3. Replace outer casing.
If the manual reset vent safety switch continues to "shut off" the gas
ow to the main burner a qualied service person must be contacted
to inspect for improper venting, blockage in the vent pipe or the
manual reset vent safety switch for being defective.
Figure 8
The correct ame will be a short blue inner ame with a much larger
light blue outer ame. The burner does not have a primary air
adjustment. The ame will be proper if the factory-set pressure and
orice are used. After the furnace has begun operating, cleaning
of the burner may be needed for proper ame, examine at least 2
times per season.
To clean burnerports, disconnect thegas supplyto the valve. Remove
the burner assembly from the combustion chamber. Remove pilot
burner from main burner and then remove the main burner. Force
water into the ports and blow dry with vacuum cleaner air, or low
pressure compressed air.
The correct ame will be blue, extending past the thermopile. The
ame will surround the thermopile just below its tip.
Natural gas pilots require adjusting when the inlet gas pressure is
above 5" w.c. (1.245kPa). Remove the pilot cover screw on the
control valve and turn the adjustment screw clockwise to reduce
ame. Replace pilot cover screw to eliminate gas leaking at that
control valve opening.
LP gas (propane) will not require adjustment.
After use, cleaning may be required for the proper ame.
Examine the pilot ame before and during each heating season.
Figure 9
Figure 10
VENT SAFETY SHUTOFF SYSTEM
PROPER MAIN BURNER FLAME
PROPER PILOT FLAME

32038-1-0314Page 14
GENERAL All furnaces have been re-tested to check for proper
operation. This includes main burner ame, pilot ame, and gas
control operation. If the furnace fails to function on initial installation,
it is advisable to re-check the following:
1. Inlet gas pressure.
2. Type of gas being used and that shown on the rating plate.
The Service Department at Empire Comfort Systems, Inc. may be
contacted to assist in servicing furnace.
Servicing the Pilot and Main Burner, Pilot Orice, Thermopile
and Main Burner Orice
Disconnect the gassupply at theinlet tothe control valve. Remove the
burner assembly to which the above components are attached.
Pilot Does Not Light
With air in the gas line, such as when the furnace is rst installed
or was "OFF" all summer, the pilot ame may be too lean to ignite
on the rst few trials. Turn the gas control knob to PILOT position
and depress the gas control knob. Hold the gas control knob down
to bleed the line;
1. Use lighter rod to light pilot with a match.
If Pilot Does Not Light By Any Means
1. Check gas control knob for being in the "Pilot" position.
2. Check pilot adjustment for being full open (counterclockwise
to open).
3. If gas is available in the supply tubing, the pilot orice and/
or pilot burner is probably restricted by a spider web. Clean
pilot assembly and relight.
If Pilot Does Not Remain "On" After Releasing Gas Control
Knob
1. Follow instructions and hold gas control knob down longer
and harder.
2. Determine if pilot ame extends past thermopile; if not, adjust
pilot ame or clean pilot burner.
3. Replace thermopile if millivolt reading isless than 300millivolts
when wall thermostat or remote bulb is turned OFF. Replace
gas control if magnet dropout millivolt reading is over 100
millivolts.
Pilot Outage During Normal Operation
1. Check input by manifold pressure gauge or gas meter.
2. Check millivolt output when furnace is in operation. If millivolt
output decreases during furnace operation gas control may
be defective.
Main Gas Valve Does Not Open When Thermostat Is Turned
"On"
1. Check millivolt output of thermopile.
2. Thermostat wires may be broken.
3. Thermostat may be defective.
TROUBLESHOOTING

32038-1-0314 Page 15
To Order Parts Under Warranty, please contact your local Empire dealer. See the dealer locator at www.empirecomfort.com. To
provide warranty service, your dealer will need your name and address, purchase date and serial number, and the nature of the
problem with the unit.
To Order Parts After the Warranty Period, please contact your dealer or one of the Master Parts Distributors listed below. This
list changes from time to time. For the current list, please click on the Master Parts button at www.empirecomfort.com.
Please note: Master Parts Distributors are independent businesses that stock the most commonly ordered Original Equipment
repair parts for Heaters, Grills, and Fireplaces manufactured by Empire Comfort Systems Inc.
MASTER PARTS DISTRIBUTOR LIST
Parts Not Under Warranty
Parts can be ordered through your Service Person, Dealer, or a Master Parts Distributor. See this page for the Master Parts Distribu-
tors list. For best results, the service person or dealer should order parts through the distributor. Parts can be shipped directly to the
service person/dealer.
Warranty Parts
Warranty parts will need a proof of purchase and can be ordered by your Service Person or Dealer. Proof of purchase is required for
warranty parts.
All parts listed in the Parts List have a Part Number. When ordering parts, rst obtain the Model Number and Serial Number from the
name plate on your equipment. Then determine the Part Number (not the Index Number) and the Description of each part from the fol-
lowing illustration and part list. Be sure to give all this information . . .
Appliance Model Number Part Description
Appliance Serial Number Part Number
Type of Gas (Propane or Natural)
Do not order bolts, screws, washers or nuts. They are standard hardware items and can be purchased at any local hardware store.
Shipments contingent upon strikes, res and all causes beyond our control.
HOW TO ORDER REPAIR PARTS
Dey Distributing
1401 Willow Lake Boulevard
Vadnais Heights, MN 55101
Phone: [phone]
Toll Free: 800-397-1339
Website: www.deydistributing.com
Parts: Heater, Hearth and Grills
Victor Division of F. W. Webb Company
200 Locust Street
Hartford, CT 06114
Phone: [phone]
Toll Free: 800-243-9360
Fax: [phone]
Toll Free Fax: [phone]
Websites: www.fwwebb.com & www.victormfg.com
Parts: Heater, Hearth and Grills
East Coast Energy Products
10 East Route 36
West Long Branch, NJ 07764
Phone: [phone]
Toll Free: 800-755-8809
Fax: [phone]
Website: www.eastcoastenergy.com
Parts: Heater, Hearth and Grills
Able Distributors
2501 North Central Avenue
Chicago, IL 60639
Phone: [phone]
Toll Free: 800-880-2253
Fax: [phone]
Website: www. abledistributors.com
Parts: Heater

32038-1-0314Page 16
USE ONLY MANUFACTURER'S REPLACEMENT PARTS. USE OF ANY OTHER PARTS COULD CAUSE INJURY OR DEATH.
ATTENTION: When ordering parts, it is very important that part number and description of part coincide.
PARTS LIST
1 WFA115 HEADER GASKET
2 GWT172 HEADER ASSEMBLY
(INCLUDES NO. 1, GASKET) (USA)
2 15740 HEADER ASSEMBLY
(INCLUDES NO. 1, GASKET) (CANADA)
3 GWT182 INNER CASING ASSEMBLY
4 GWT065 DIVERTER ASSEMBLY- GWT-25-2
4 GWT066 DIVERTER ASSEMBLY - GWT-35-2
5 R3239 VENT SAFETY SWITCH - GWT-25-2
5 R3045 VENT SAFETY SWITCH - GWT-35-2
6 R3038 ECO LEAD ASSEMBLY
7 GWT020 FRONT SHIELD
8 GWT077 HEAT SHIELD
9 26463 EXCHANGER ASSEMBLY - GWT-25-2
9 26464 EXCHANGER ASSEMBLY- GWT-35-2
10 GWT070 BURNER BRACKET ASSEMBLY -
GWT-25-2
10 GWT073 BURNER BRACKET ASSEMBLY -
GWT-35-2
11 R5245 GAS VALVE - NAT
11 R5246 GAS VALVE - LP
12 R3031 BURNER (GWT-25-2 – 3 REQUIRED)
(GWT-35-2 – 4 REQUIRED)
13 P8855 BURNER ORIFICE - GWT-25-2 NAT
(3 REQUIRED)
13 P8865 BURNER ORIFICE - GWT-25-2 LP
(3 REQUIRED)
13 P8854 BURNER ORIFICE - GWT-35-2 NAT
(4 REQUIRED)
13 P8865 BURNER ORIFICE - GWT-35-2 LP
(4 REQUIRED)
14 GWT169 AIR SHUTTER REAR- GWT-25-2 LPG
14 GWT012 AIR SHUTTER REAR - GWT-35-2 LPG
15 GWT054 AIR SHUTTER BOTTOM - GWT-25-2 LP
15 GWT049 AIR SHUTTER BOTTOM - GWT-35-2 LP
16 GWT168 AIR SHUTTER FRONT - GWT-25-2 LP
16 GWT011 AIR SHUTTER FRONT - GWT-35-2 LP
17 GWT010 BURNER COMPARTMENT FRONT -
GWT-25-2
17 GWT008 BURNER COMPARTMENT FRONT -
GWT-35-2
18 DV064 COVER PLATE
19 R3035 PILOT - LP
19 R3034 PILOT - NAT
20 GWT021 PILOT BRACKET
21 R1054 THERMOPILE
22 GWT186 CASING BRACKET
23 GWT177 CASING FRONT ASSEMBLY
(INCLUDES #24)
24 R3763 MAGNET (2 REQUIRED)
25 GWT087 CASING DOOR ASSEMBLY (USA)
25 15739 CASING DOOR ASSEMBLY (CANADA)
26 R885 NYLON WASHER (2 REQUIRED)
27 23906 VALVE SHIELD
28 23385 CASING ASSEMBLY COMPLETE
(INCLUDES #23, #25, & #26)
29 29011 EXCHANGER TUBE SUPORT
N/S GWT121 PILOT TUBING- GWT-25-2
N/S GWT076 PILOT TUBING- GWT-35-2
N/S R1089 PILOT ORIFICE
(HONEYWELL .009 LP ONLY)
N/S R1081 PILOT ORIFICE
(HONEYWELL .014 NAT ONLY)
N/S GWT190 HARDWARE PACKAGE
Index
No.
Part No. Description Index
No.
Part No. Description

32038-1-0314 Page 17
23
26
25
28
1
2
3
4
6
5
7
8
9
10
27
11
14
13
12
18
15
16
17
19
21
20
24
22
29
PARTS VIEW

32038-1-0314Page 18
Index Part
No. Number Description
1 GW-130 Remote Bulb Control Kit
2 R-1224 Remote Bulb Control
3 R-2499 Wire Assembly
4 R-1162 Control Knob
5 R-1720 Plastic Clip (3 Required)
6 R-1223 Instructions
7 R-1578 No. 6-32 x 1/4" (6mm) Screw (2 Re-
quired)
Caution: Remote bulb wire routing is important. Wires should be in
proper location to avoid damage from being overheated.
Incorrect routing of remote bulb control wires may result
in damage to wires and incorrect operation of remote
bulb control. Follow these instructions and refer to the
drawing for proper wire routing.
7. If remote bulb control is located on the right side of the outer
casing, carefully bend or loop capillary wire around control. This
will enable the sensing bulb to be positioned at the bottom of
the unit.
8. Secure sensing bulb on the inside, at the bottom, of the outer
casing with (2) plastics clips.
9. Feed the wire assembly down along the inside of the outer
casing.
10. Use third plastic clip to secure wire assembly and capillary
wire to the casing. (Approximately 24" (610mm) from bottom
of unit.)
11. Attach control knob to remote bulb control.
12. Install furnace according to instructions in the Installation In-
structions and Owner's Manual.
Note: If wall furnace is already installed, secure outer casing to
unit.
13. Attach wire assembly to gas valve at the "TH" and "TH/TP"
terminals on the Robertshaw valve.
Attach wire assembly to gas valve at the "THERMO" terminals
on the ITT valve. If the wire assembly has two 1/4" (6mm)
female connectors, the connectors should be cut off the wire
assembly. Strip and bare the wires and attach wires to the
"THERMO" terminals.
Note: This remote bulb control is connected to the gas valve
the same way as a wall thermostat. Any references made to
the thermostat in the lighting instructions would also apply to
the remote bulb control.
INSTRUCTIONS
Note: At the option of the owner, the remote bulb control may be
located on the left or right side of the outer casing.
1. Remove remote bulb control from the shipping carton.
2. Remove outer casing assembly from shipping carton.
Note: If wall furnace is already installed, remove outer casing from
unit and lay on oor with front side down.
3. Attach wire assembly to remote bulb control.
4. Carefully unwind capillary wire on remote bulb control.
5. Remove (3) hole plugs from left or right side of outer casing
where remote bulb control is to be installed.
6. Mount remote bulb control to inside of outer casing with (2) No.
6-32 x 1/4" (6mm) screws.
MODELS
GWT-25 RB, GWT-35 RB, GWT-50 RB
OPTIONAL REMOTE BULB CONTROL INSTALLATION
INSTRUCTIONS

32038-1-0314 Page 19
Installing Blower Using Three-Prong Plug
1. Install furnace according to Installation Instructionsand Owner's
Manual.
2. Refer to Drawing for measurements to locate (2) mounting
holes on wall surface above furnace.
On Solid Wall
3. After locating mounting holes, attach (2) #10 x 1 1/2" screws
provided in blower kit into wall. Do not completely tighten
screwheads to wall, leave a 7/16" gap between screwheads
and wall.
On Sheet Rock Wall
3. After locating mounting holes, drill (2) 5/16" diameter holes into
wall. Insert the (2) plastic expansion anchors into holes. Insert
(2) #10 x 1 1/2" screws provided in blower kit into (2) plastic
expansion anchors. Do not completely tighten screwhead
to plastic expansion anchors, leave a 7/16" gap between
screwheads and plastic expansion anchors. Refer to Figure
2.
4. At the top of outer casing remove (1) screw from center
clearance hole that attaches outer casing to header assembly.
Also, remove (2) screws that attach bottom of outer casing to
inner casing.
5. Pull the outer casing forward approximately 1 inch away from
wall surface.
6. Remove (4) 8 x 3/8" screws that attach blower front to blower
housing.
Caution: When removing blower front be careful not to
damage motor coil wires. Damaged coil wires will disable
blower function.
7. Position blower housing on top of header assembly and route
three-prong cord set between left side of outer casing and inner
casing.
Caution: Blower cord set routing is important. Cord set
should be in proper location to avoid being overheated.
Incorrect routing of cord set may result in damage to cord
set.
8. Replace the outer casing to the wall surface.
9. Attach outer casing to header assembly. Attention: The center
clearance hole will not be used. The two outside clearance
holes will be used to attach outer casing to header assembly,
(1) screw from Step 4 and (1) screw supplied in hardware
package. Refer to Figure 1.
Figure 1
GWTB-2 FOR MODELS
GWT-25 (SG, RB), GWT-35 (SG, RB), GWT-50 (SG, RB)
10. Attach outer casing to inner casing with (2) screws from Step
4.
11. Align key hole slots on back of blower housing with the (2)
screws attached to wall. Position blower housing ush with
wall surface and on top of outer casing. Complete tightening
blower housing screws from Step 3 to wall.
12. Attach caps and plugs from blower housing and blower front.
13. Attach blower front to blower housing with (4) 8 x 3/8" screws
from Step 6.
14. Installation of optional blower assembly is completed.
Caution: When installing blower housing onto wall be careful
motor coil is not damaged.
Installing Blower With Hard Wiring
1. When facing the wall opening, install 120V electrical outlet
junction box inside wall opening on left wall stud approximately
12 inches above header plate.
2. Refer to Drawing for measurements to locate access hole for
electrical wiring on wall surface.
3. After locating access hole, drill a 1/2" hole into wall.
4. Route enough eld wiring from 120V electrical outlet junction
box through 1/2" access hole in wall for connection to blower
housing.
5. Install furnace according to Installation Instructions andOwner's
Manual.
6. Refer to Drawing for measurements to locate (2) mounting
holes on wall surface above the furnace.
On Solid Wall
7. After locating mounting holes, attach (2) #10 x 1 1/2" screws
provided in blower kit into wall. Do not completely tighten
screwheads to wall, leave a 7/16" gap between screwheads
and wall.
On Sheet Rock Wall
7. After locating mounting holes, drill (2) 5/16" diameter holes into
wall. Insert (2) plastic expansion anchors into holes. Insert
(2) #10 x 1 1/2" screws provided in blower kit into (2) plastic
expansion anchors. Do not completely tighten screwhead
to plastic expansion anchors, leave a 7/16" gap between
screwheads and plastic expansion anchors. Refer to Figure
2.
Figure 2
OPTIONAL BLOWER INSTALLATION INSTRUCTIONS

32038-1-0314Page 20
Wiring
The appliance, when installed, must be electrically grounded in
accordance with local codes or, in the absence of local codes, with
the National Electrical Code, ANSI/NFPA 70 or Canadian Electrical
Code, CSA C22.1, if an external electrical source is utilized. This
appliance is equipped with a three-prong [grounding] plug for
your protection against shock hazard and should be plugged
directly into a properly grounded three-prong receptacle. Do
not cut or remove the grounding prong from this plug. For an
ungrounded receptacle, an adapter, which has two prongs and a
wire for grounding, can be purchased, plugged into the ungrounded
receptacle and its wire connected tothe receptacle mounting screws.
With this wire completing the ground, the appliance cord plug can
be plugged into the adapter and be electrically grounded.
WARNING:
Unplugging of blower accessory will not stop the heater
from cycling. To shut heater off: Turn temperature dial or
thermostat to lowest setting. Turn knob on gas control to
"OFF", depressing slightly. Do not force.
CAUTION: Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
Oiling
The blower motor does not have oiling holes. Do not attempt to oil
the blower motor.
GWTB-2 WIRING DIAGRAM
8. Remove three prong cord set from blower housing.
9. Remove (4) 8 x 3/8" screws that attach blower front to blower
housing.
10. Position blower housing on top of header assembly.
11. Route 120V eld wiring into blower housing through cord set
hole on back of blower housing.
12. Refer to wiring diagramto make wiring connectionsinside blower
housing. Be sure to follow all local and National electrical codes
when making eld wiring connections.
13. Align key hole slots on back of blower housing with (2) screws
attached to wall. Position blower housing ush with wall surface
and on top of outer casing. Complete tightening blower housing
screws from Step 7 to wall.
14. Attach caps and plugs from blower housing and blower front.
15. Attach blower front to blower housing with (4) 8 x 3/8" screws
from Step 9.
16. Installation of optional blower assembly is completed.
13”
(330 mm)
4 7/16”
(112.6 mm)
Figure 3
Fan Control
The automatic fan control is located on the bottom of the blower
assembly. The fan control is a nonadjustable, automatic type. The
fan control will require between 3 and 7 minutes of main burner
operation before the fan control "closes" and activates the blower.
The blower will continue to run between 3 and 7 minutes after the
main burner shuts off, before the fan control "opens" and deactivates
the blower.
OPTIONAL BLOWER INSTALLATION INSTRUCTIONS