Empire Heating Systems GWT-50W Quick start guide

Page 1
INSTALLATION INSTRUCTIONS
AND
OWNER'S MANUAL
GRAVITY VENTED
DUAL WALL FURNACE
MODEL
GWT-50W-2
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.
Installer: Leave this manual with the appliance.
Consumer: Retain this manual for future reference.
 
vapors and liquids in the vicinity of this or any
other appliance.
— WHAT TO DO IF YOU SMELL GAS
  
  
any phone in your building.
        
neighbor’s phone. Follow the gas supplier’s
instructions.
  

— Installation and service must be performed by a
-
plier.
WARNING: If the information in these instructions
        
result causing property damage, personal injury or
loss of life.

37410-0-0616Page 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 On/Off Device ..........................................................................................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
Optional Blower Installation Instructions .......................................................... 17-18
Warranty.................................................................................................................19
TABLE OF CONTENTS

37410-0-0616 Page 3
THIS IS A HEATING APPLIANCE
DO NOT OPERATE THIS APPLIANCE WITHOUT OUTER CASING INSTALLED.
•Due to high temperatures the appliance should be

draperies.
 
of high surface temperatures and should stay away
to avoid burns or clothing ignition.
 
they are in the same room as the appliance.
 
placed on or near the appliance.
 
an appliance must be replaced prior to operating
the appliance.
 
 Installation and repair should be done by a
QUALIFIED SERVICE PERSON. The appliance
should be inspected before use and at least annually
        
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 appliance be kept clean.
 put anything around the furnace that will

  keep the appliance area clear and free from

vapors and liquids.
  examine venting system periodically and replace
damaged parts.
 make a periodic visual check of pilot and burners.
Clean and replace damaged parts.
 use this heater if any part has been under

to inspect the heater and to replace any part of the
control system and any gas control which has been
under water.
 

IMPORTANT SAFETY INFORMATION

37410-0-0616Page 4
Some people cannot smell well. Some people cannot smell the

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.

and explosions. In its natural state, propane is odorless and
colorless. You may not know all the following safety precau-
tions 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.
•  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

37410-0-0616 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
installation.
2. Installer must have owner ll out and mail warranty card
supplied with furnace.
3. Installer should show owner how to start and operate furnace.
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.

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 in and 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.
Model GWT-50W
Input BTU/HR (KW/H) 50,000 (14.7)
Height 66 1/8" (1679mm)
Width 16" (406mm)
Depth (Out of wall) 6" (152mm)
Gas Inlet Pipe 1/2"
Vent Pipe Type B Oval 4" (102mm)
Accessory
Blower Package GWTB2W
GWT-50 (SG, RB) Is a DUAL WALL Furnace. Warmed air is discharged into two rooms which share a common wall.
INTRODUCTION
SPECIFICATIONS

37410-0-0616Page 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 isfactory installedon 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.
Studspace around gas vents mustbe free of obstructions andbuilding 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

37410-0-0616 Page 7
Check all local codes for requirements, especially for the size and
type of gas supply line required.
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
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.
Check all local codes for requirements, especially for the size and
type of gas supply line required. On Natural gas lines less than 15'
(4.57m) long, use 1/2" pipe; on longer runs, use 3/4" iron pipe or
equal. On LP gas lines please consult LP gas supplier.
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.

be disconnected from piping at inlet of control valve and pipe
capped or plugged for pressure test. Never pressure test with

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 MetalTubing
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. The appliance 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 appliance 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 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

37410-0-0616Page 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 conventionalframe,
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, check the walls, attic and roof to 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 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 at each 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. Two header extensions
are attached to the header plate. One header extension is welded
to the header plate and one header extension is screwed to the
header plate. To install header plate into wall opening remove the
header extension that is screwed to the header plate (2 screws).
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. Replace and attach header extension onto
header plate with 2 screws.
CLEARANCES
VENTILATION AND COMBUSTION AIR
LOCATION - ALL MODELS
ROUGH-IN INSTRUCTIONS

37410-0-0616 Page 9
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”
(1679 mm)
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
Figure 3
FINISHING INSTRUCTIONS
62 1/4”
(1581 mm)
14 ½”
(368 mm) 66 1/8”
(1679 mm)
WALL
OPENING
Figure 2

37410-0-0616Page 10
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.
Figure 6
FINISHING INSTRUCTIONS (continued)

37410-0-0616 Page 11
CAUTION — Do not run wire behind anges of Header Plate or in
any location where it might be damaged.
Millivolt wall on/off device is specially designed for use on self-
generating systems. They should never be used on line or low
voltage A.C. circuits.
Installing the ON/OFF Device
To install an ON/OFF device (such as a wall switch, remote, toggle
switch,or thermostat), remove the wire nut from the two wires
from the valve. Run additional wire from the valve wires to the
ON/OFF device. Install the ON/OFF device in the same room as
the furnace following the installation instructions supplied with it.
In the absence of instructions, install the ON/OFF device 4 to 5
feet above the oor on an interior wall not affected by another
heating source (i.e. stove or water heater) or the temperature of
an adjoining room.
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 heater
OFF.
• Across the thermopile terminals, 150-250 millivolts with heater
ON.
• Across the heater wires at the valve, less than 30 millivolts with
heater ON.
To conserve Gas: Turn off pilot when heater is not in use.
OPTIONAL ON/OFF DEVICE(SG MODELS)
TO VENT SAFETY
TO THERMOPILE
TO VENT SAFETY
TO THERMOPILE
TO OPTIONAL
THERMOSTAT
Figure 7
TO OPTIONAL
ON/OFF DEVICE

37410-0-0616Page 12
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING:
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


WHAT TO DO IF YOU SMELL GAS
 
 
do not use any phone in your building.
        
phone. Follow the gas supplier's instructions.
 -
ment.
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


or explosion.
D. Do not use this appliance if any part has been under water.

the appliance and to replace any part of the control system
and any gas control which has been under water.
TO TURN OFF GAS TO APPLIANCE
1. Turn off all electric power (if applicable) to appliance if
service is to be performed.
2. Remove control access panel (control door).
3. Push in gas control knob slightly and turn clockwise
to "OFF." Do not force.
4. Replace control access panel (control door).
1. STOP! Read the safety information above.
2. Turn off all electric power to the appliance (if applicable).
3. Remove control access panel (control door).
4. Push in gas control knob slightly and turn clockwise
to "OFF."
NOTE:
unless knob is pushed in slightly. Do not force.
5. Wait ten (10) minutes to clear out any gas. Then smell

Follow "B" in the safety information above. If you don't
smell gas, go to the next step.
6. Find pilot - follow metal tube from gas control. The pilot
is mounted on front of main burner.
7. Turn gas control knob counterclockwise to "PI-
LOT."
8. 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.
 -

 
control knob to "OFF" and call your service technician
or gas supplier.
9. Turn gas control knob counterclockwise to "ON."
10. Replace control access panel (control door).
11. Turn on all electric power to the appliance (if applicable).
LIGHTING INSTRUCTIONS
GAS CONTROL KNOB SHOWN IN "OFF" POSITION
LIGHTING INSTRUCTIONS

37410-0-0616 Page 13
This appliance must be properly connected to a venting system. This
appliance is equipped with a vent safety shutoff system.
Warning: Operation of this wall furnace when not connected
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.
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 burner ports, disconnect the gas supply to the valve. Remove the
burner assembly from thecombustion 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.
Figure 9
Figure 10
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 8
VENT SAFETY SHUTOFF SYSTEM
PROPER MAIN BURNER FLAME
PROPER PILOT FLAME
WIRES FOR
ON/OFF DEVICE

37410-0-0616Page 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.
Contact your Empire Dealer to assist in servicing furnace.


Disconnect the gas supply at the inlet to the 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.

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 than300 millivolts
when wall mounted on/off device 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 ON/OFF Device Is
Turned "On"
1. Check millivolt output of thermopile.
2. Device wires may be broken.
3. Device may be defective.
TROUBLESHOOTING

37410-0-0616 Page 15
1 WFA-115 HEADER GASKET
2 36324 HEADER ASSEMBLY
(INCLUDES NO. 1, GASKET)
3 GWT-184 INNER CASING ASSEMBLY
4 GWT-151 DIVERTER ASSEMBLY (2 REQUIRED)
5 GWT-020 FRONT SHIELD (2 REQUIRED)
6 GWT-077 HEAT SHIELD (2 REQUIRED)
7 36328 CASING FRONT ASSEMBLY
(2 REQUIRED) (INCLUDES #11)
8 GWT-186 CASING BRACKET (4 REQUIRED)
9 36321 CASING DOOR ASSEMBLY
(2 REQUIRED)
10 R-885 NYLON WASHER (4 REQUIRED)
11 R-3763 MAGNET (4 REQUIRED)
12 DV-064 COVER PLATE (2 REQUIRED)
13 GWT-008 BURNER COMPARTMENT FRONT
(2 REQUIRED)
14 R-3046 VENT SAFETY SWITCH
15 R-3038-A ECO LEAD ASSEMBLY
16 26466 EXCHANGER ASSEMBLY - REAR
17 26465 EXCHANGER ASSEMBLY - FRONT
18 R-3036 PILOT - NAT
18 R-3037 PILOT - LPG
19 R-1054 THERMOPILE
20 GWT-096 BURNER BRACKET ASSEMBLY
21 R-5245 GAS VALVE - NAT
21 R-5246 GAS VALVE - LPG
22 R-3031 BURNER (6 REQUIRED)
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 can be ordered only through your service person or dealer. For best results, the service person or dealer should order parts
through the distributor. Parts can be shipped directly to the service person/dealer.
All parts listed in the Parts List have a Part Number. When ordering parts, rst obtain the Model 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 following appropriate
illustration and list. Be sure to give all this information.
Furnace Model Number Part Description
Furnace 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.
Empire Comfort Systems, Inc. Belleville, Illinois
PARTS LIST
HOW TO ORDER REPAIR PARTS
23 P-88-55 BURNER ORIFICE - NAT (6
REQUIRED)
23 P-88-65 BURNER ORIFICE - LPG (6
REQUIRED)
24 GWT-014 AIR SHUTTER FRONT - LPG
(2 REQUIRED)
25 GWT-015 AIR SHUTTER REAR -
LPG (2 REQUIRED)
26 GWT-054 AIR SHUTTER BOTTOM -
LPG (2 REQUIRED)
27 23906 VALVE SHIELD
28 36354 CASING ASSEMBLY COMPLETE
(INCLUDES #7, #9 AND TWO #10)
29 24752 LOWER SHIELD
30 29011 EXCHANGER TUBE ASSEMBLY
NOT
SHOWN GWT-099 PILOT TUBING
NOT
SHOWN R-3178 PILOT ORIFICE (HONEYWELL K14 .014 LPG ONLY)
NOT
SHOWN R-3179 PILOT ORIFICE (HONEYWELL A26 .026 NAT ONLY)
NOT
SHOWN R-734 MATCH HOLDER
NOT
SHOWN GWT-190 HARDWARE PACKAGE (2 REQUIRED)
INDEX PART
NO. NO. DESCRIPTION
INDEX PART
NO. NO. DESCRIPTION

37410-0-0616Page 16
PARTS VIEW
7
5
6
4
8
9
10
13
16
22
23
24
25
26 20 22
23
26
25
24
21
19
18
9
27
10
11
12
13
17
8
15
14
6
5
7
4
3
2
1
28
12
29
30
30

37410-0-0616 Page 17
OPTIONAL BLOWER INSTALLATION INSTRUCTIONS
Installing Blower Using Three-Prong Plug
1. Install furnace according to Installation Instructions and 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 toheader 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
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 and Owner'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
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 diagram to make wiring connections inside 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.
GWTB2W-1 FOR MODELS
GWT-25W, GWT-35W, GWT-50W

37410-0-0616Page 18
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.
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

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 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.
13”
(330 mm)
4 7/16”
(112.6 mm)
Figure 3
GWTB2W WIRING DIAGRAM
PARTS LIST
INDEX
NO. PART NO. DESCRIPTION
1 R-2204 CORD SET
2 8720161 STRAIN RELIEF BUSHING
3 36334 BLOWER HOUSING ASSEMBLY
4 8520142 BRASS BUSHING (4 REQUIRED)
5 36338 BLOWER SIDE (2 REQUIRED)
6 R-3085 WIRE ASSEMBLY
7 R-2503 FAN SWITCH
8 36337 BLOWER FRONT
9 8520141 RUBBER GROMMET (4 REQUIRED)
10 R-2804A BLOWER MOTOR

37410-0-0616 Page 19
WARRANTY
Empire Comfort Systems Inc. warranties this space heating product to be free from defects at the time of purchase and for the peri-
ods specied below. Space heating products must be installed by a qualied technician and must be maintained and operated safely,
in accordance with the instructions in the owner’s manual. This warranty applies to the original purchaser only and is not transferable.
All warranty repairs must be accomplished by a qualied gas appliance technician.
Limited Ten-Year Parts Warranty – Combustion Chamber
Empire promises to the owner that if the combustion chamber (see parts list) fails because of defective workmanship or
material within ten years from the date of purchase, Empire will repair or replace at Empire’s option.
Limited Three-Year Parts Warranty – All Other Components
(Except Remote Controls, Accessories and Replacement Parts)
Should any part fail because of defective workmanship or material within three years from the date of purchase, Empire will
repair or replace at Empire’s option.
Limited One-Year Parts Warranty – Remote Controls, Accessories, and Parts
Should any remote control, accessory, or other part fail because of defective workmanship within one year from the date of
purchase, Empire will repair or replace at Empire’s option.
Duties of the Owner
The appliance must be installed by a qualied installer and operated in accordance with the instructions furnished with the
appliance.A bill of sale, cancelled check, or payment record should be kept to verify purchase date and establish warranty
period. Ready access to the appliance for service.
What Is Not Covered
Damages that might result from the use, misuse, or improper installation of this appliance.
Travel, diagnostic costs and freight charges on warranted parts to and from the factory.
Claims that do not involve defective workmanship or materials.
Unauthorized service or parts replacements.
Removal and reinstallation cost.
Inoperable due to improper or lack of maintenance.
How To Get Service
To make a claim under this warranty, please have your receipt available and contact your installing dealer. Provide the
dealer with the model number, serial number, type of gas, and purchase verication. The installing dealer is responsible for
providing service and will contact the factory to initiate any warranted parts replacements. Empire will make replacement
parts available at the factory. Shipping expenses are not covered.
If, after contacting your Empire dealer, service received has not been satisfactory, contact: Consumer Relations Department,
Empire Comfort Systems Inc., PO Box 529, Belleville, Illinois 62222, or send an e-mail to [email protected] with
“Consumer Relations” in the subject line.
Your Rights Under State Law
This warranty gives you specic legal rights, and you may also have other rights, which vary from state to state.

37410-0-0616Page 20
Empire Comfort Systems Inc.
Belleville, IL
If you have a general question
about our products, please e-mail
us at [email protected].
If you have a service or repair
question, please contact your dealer.
www.empirecomfort.com