UNVENTED (VENT-FREE) PROPANE/LP GAS HEATERS
SAFETY INFORMATION AND INSTALLATION MANUAL
INFRARED: GMP16, GMP16T, GMP26, GMP26T
BLUE FLAME: GMP20BT, GMP30BT
WARNING: If the information in this manual is not
followed exactly, a fire or explosion may result causing
property damage, personal injury, or loss of life.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS
• 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 in-
structions.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a quali-
fied installer, service agency, or the gas supplier.
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SAFETY INFORMATION
Due to high temperatures, the
applianceshouldbelocatedout
of traffic and away from furni-
ture and draperies.
WARNING:Thisproductcon-
tainsand/orgenerateschemicals
known to the State of California
to cause cancer or birth defects,
or other reproductive harm.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
IMPORTANT:Readthisowner’s
manualcarefullyandcompletely
beforetryingtoassemble, oper-
ate, or service this heater. Im-
proper use of this heater can
cause serious injury or death
fromburns,fire,explosion,elec-
trical shock, and carbon mon-
oxide poisoning.
Surface of heater becomes very
hot when running heater. Keep
children and adults away from
hot surface to avoid burns or
clothing ignition. Heater will re-
main hot for a time after shut-
down. Allow surface to cool be-
fore touching.
DANGER:Carbonmonoxide
poisoning may lead to death!
Carefully supervise young chil-
dren when they are in the same
room with heater.
Carbon Monoxide Poisoning: Early signs of car-
bon monoxide poisoning resemble the flu, with head-
aches, dizziness, or nausea. If you have these signs,
the heater may not be working properly. Get fresh
air at once! Have heater serviced. Some people are
more affected by carbon monoxide than others. These
include pregnant women, people with heart or lung
disease or anemia, those under the influence of alco-
hol, and those at high altitudes.
Make sure grill guard is in place
before running heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other flam-
mable vapors and liquids.
Propane/LP Gas:Propane/LPgas is a fuel gases. Fuel
gases are odorless. An odor-making agent is added
to fuel gas. The odor helps you detect a fuel gas leak.
However, the odor added to fuel gas can fade. Fuel
gas may be present even though no odor exists.
1. This appliance is only for use with the type of
gas indicated on the rating plate. This appli-
ance is not convertible for use with other gases.
Make certain you read and understand all warn-
ings. Keep this manual for reference. It is your
guide to safe and proper operation of this heater.
2. Do not place propane/LP supply tank(s) in-
side any structure. Locate propane/LP supply
tank(s) outdoors.
3. This heater shall not be installed in a bedroom
or bathroom.
WARNING: Any change to
thisheateroritscontrolscanbe
dangerous.
4. If you smell gas
• shut off gas supply
• 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
WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not ap-
proved for use with this heater.
• if you cannot reach your gas supplier, call
the fire department
113048-01C
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SAFETY INFORMATION
PRODUCT
IDENTIFICATION
Control Knob
Continued
5. This heater needs fresh, outside air ventila-
tion to run properly. This heater has an Oxy-
gen Depletion Sensing (ODS) safety shutoff
system. The ODS shuts down the heater if not
enough fresh air is available. See Air for Com-
bustion and Ventilation, page 5.
Heater
Cabinet
Ignitor Button
6. Keep all air openings in front and bottom of
heater clear and free of debris. This will in-
sure enough air for proper combustion.
7. If heater shuts off, do not relight until you pro-
vide fresh, outside air. If heater keeps shut-
ting off, have it serviced.
8. Do not run heater
• where flammable liquids or vapors are used
or stored
• under dusty conditions
Grill Guard
Glass Panel
9. Before using furniture polish, wax, carpet
cleaner, or similar products, turn heater off. If
heated, the vapors from these products may
create a white powder residue within burner
box or on adjacent walls or furniture.
Front Panel
Figure 1 - Vent-Free Gas Heater
10. Do not use heater if any part has been under
water. Immediately call a qualified service
technician to inspect the room heater and to
replace any part of the control system and any
gas control which has been under water.
UNPACKING
1. Remove heater from carton.
2. Remove all protective packaging applied to
heater for shipment.
11. Turn off and let cool before servicing. Only a
qualified service person should service and
repair heater.
3. Check heater for any shipping damage. If
heater is damaged, promptly inform dealer
where you bought heater.
12. Operating heater above elevations of 4,500
feet could cause pilot outage.
PRODUCT FEATURES
SAFETY DEVICE
13. To prevent performance problems, do not use
propane/LP fuel tank of less than 100 lbs.
capacity.
This heater has a pilot with an Oxygen Depletion
Sensing (ODS) safety shutoff system. The ODS/
pilot is a required feature for vent-free room heat-
ers. The ODS/pilot shuts off the heater if there is
not enough fresh air.
14. Provide adequate clearances around air
openings.
LOCAL CODES
Install and use heater with care. Follow all local
codes. In the absence of local codes, use the latest
edition of National Fuel Gas Code, ANSI Z223.1/
NFPA 54*.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system re-
quires no matches, batteries, or other sources to
light heater.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
THERMOSTATIC HEAT CONTROL
Thermostat models have a thermostat sensing bulb
and a control valve. This results in the greatest heater
comfort. This can also result in lower gas bills.
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
4
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Unusually tight construction is defined as
construction where:
AIR FOR COMBUSTION
AND VENTILATION
a. walls and ceilings exposed to the out-
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6x10-11 kg per pa-sec-m2) or
less with openings gasketed or sealed
and
WARNING:Thisheatershall
not be installed in a confined
space or unusually tight con-
struction unless provisions are
providedforadequatecombus-
tion and ventilation air. Read
the following instructions to in-
sure proper fresh air for this
and other fuel-burning appli-
ances in your home.
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to ar-
eas such as joints around window and
door frames, between sole plates and
floors, between wall-ceiling joints, be-
tween wall panels, at penetrations for
plumbing, electrical, and gas lines, and
at other openings.
Today’s homes are built more energy efficient than
ever. New materials, increased insulation, and new
construction methods help reduce heat loss in
homes. Home owners weather strip and caulk
around windows and doors to keep the cold air out
and the warm air in. During heating months, home
owners want their homes as airtight as possible.
If your home meets all of the three criteria
above, you must provide additional fresh
air. See Ventilation Air From Outdoors,
page 7.
If your home does not meet all of the three
criteria above, proceed to Determining
Fresh-Air Flow For Heater Location, page 6.
While it is good to make your home energy effi-
cient, your home needs to breathe. Fresh air must
enter your home.All fuel-burning appliances need
fresh air for proper combustion and ventilation.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/NFPA
54 defines a confined space as a space whose vol-
ume is less than 50 cubic feet per 1,000 Btu per
hour (4.8 m3 per kw) of the aggregate input rating
of all appliances installed in that space and an un-
confined space as a space whose volume is not
less than 50 cubic feet per 1,000 Btu per hour (4.8
m3 per kw) of the aggregate input rating of all ap-
pliances installed in that space. Rooms communi-
cating directly with the space in which the appli-
ances are installed*, through openings not fur-
nished with doors, are considered a part of the
unconfined space.
Exhaust fans, fireplaces, clothes dryers, and fuel
burning appliances draw air from the house to
operate. You must provide adequate fresh air for
these appliances. This will insure proper venting
of vented fuel-burning appliances.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air
for Combustion and Ventilation.
All spaces in homes fall into one of the three fol-
lowing ventilation classifications:
*Adjoining rooms are communicating only if there
are doorless passageways or ventilation grills be-
tween them.
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 5 through76 will help you
classify your space and provide adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and win-
dows may provide enough fresh air for
combustion and ventilation. However, in
buildings of unusually tight construction,
you must provide additional fresh air.
113048-01C
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Example:
AIR FOR COMBUSTION
51,200 Btu/Hr (maximum the space can support)
60,000 Btu/Hr (actual amount of Btu/Hr used)
AND VENTILATION
Continued
The space in the above example is a confined space
because the actual Btu/Hr used is more than the maxi-
mum Btu/Hr the space can support. You must pro-
vide additional fresh air. Your options are as follows:
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
Determining if You Have a Confined or
Unconfined Space
Use this work sheet to determine if you have a con-
fined or unconfined space.
A. Rework worksheet, adding the space of an ad-
joining room. If the extra space provides an un-
confined space, remove door to adjoining room
or add ventilation grills between rooms. See Ven-
tilation Air From Inside Building, page 7.
Space: Includes the room in which you will install
heater plus any adjoining rooms with doorless pas-
sageways or ventilation grills between the rooms.
B. Vent room directly to the outdoors. See Ventila-
tion Air From Outdoors, page 7.
1. Determine the volume of the space (length x
width x height).
C. Install a lower Btu/Hr heater, if lower Btu/Hr size
makes room unconfined.
Length x Width x Height =__________cu. ft.
(volume of space)
If the actual Btu/Hr used is less than the maximum Btu/
Hr the space can support, the space is an unconfined
space. You will need no additional fresh air ventilation.
Example: Space size 20 ft. (length) x 16 ft.
(width) x 8 ft. (ceiling height) = 2560 cu. ft. (vol-
ume of space)
WARNING: If the area in
which the heater may be oper-
ated is smaller than that defined
as an unconfined space or if the
building is of unusually tight
construction, provide adequate
combustion and ventilation air
byoneofthemethodsdescribed
in the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 Section
5.3 or applicable local codes.
If additional ventilation to adjoining room is sup-
plied with grills or openings, add the volume of
these rooms to the total volume of the space.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
_______ (volume of space) x 20 = (Maximum
Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) x 20 =
51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in
the space.
Vent-free heater
Gas water heater* ______________ Btu/Hr
Gas furnace ______________ Btu/Hr
______________ Btu/Hr
Vented gas heater ______________ Btu/Hr
Gas fireplace logs ______________ Btu/Hr
Other gas appliances* + __________ Btu/Hr
Total
= __________ Btu/Hr
* Do not include direct-vent gas appliances. Di-
rect-vent draws combustion air from the outdoors
and vents to the outdoors.
Example:
40,000
_________ Btu/Hr
20,000
+ _________ Btu/Hr
60,000
= _________ Btu/Hr
Gas water heater
Vent-free heater
Total
4. Compare the maximum Btu/Hr the space can
support with the actual amount of Btu/Hr used.
______________ Btu/Hr (maximum the space
can support)
______________ Btu/Hr (actual amount of
Btu/Hr used)
6
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AIR FOR COMBUSTION
Ventilated
Attic
AND VENTILATION
Outlet
Air
Continued
Outlet
Air
VENTILATION AIR
To Attic
Ventilation Air From Inside Building
This fresh air would come from an adjoining un-
confined space. When ventilating to an adjoining
unconfined space, you must provide two perma-
nent openings: one within 12" of the ceiling and
one within 12" of the floor on the wall connecting
the two spaces (see options 1 and 2, Figure 2).
You can also remove door into adjoining room (see
option 3, Figure 2). Follow the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of
ventilation grills or ducts.
To
Crawl
Space
Inlet
Air
Ventilated
Crawl Space
Inlet Air
Figure 3 - Ventilation Air from Outdoors
INSTALLATION
NOTICE:Thisheaterisintended
for use as supplemental heat.
Use this heater along with your
primary heating system. Do not
install this heater as your pri-
mary heat source. If you have a
centralheatingsystem,youmay
run system’s circulating blower
whileusingheater.Thiswillhelp
circulatetheheatthroughoutthe
house. In the event of a power
outage, you can use this heater
as your primary heat source.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills
or ducts. You must provide two permanent open-
ings: one within 12" of the ceiling and one within
12" of the floor. Connect these items directly to
the outdoors or spaces open to the outdoors. These
spaces include attics and crawl spaces. Follow the
National Fuel Gas Code, ANSI Z223.1/NFPA 54,
Section 5.3, Air for Combustion and Ventilation
for required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet
or outlet air into attic if attic has a thermostat-con-
trolled power vent. Heated air entering the attic
will activate the power vent.
WARNING: A qualified ser-
vice person must install heater.
Follow all local codes.
12"
Ventilation Grills
Into Adjoining Room,
CHECK GAS TYPE
Ventilation
Grills
into Adjoining
Room,
Option 2
Or
Use only the correct type of gas (propane/LP). If
your gas supply is not the correct gas type, do not
install heater. Call dealer where you bought heater
for proper type heater.
Remove
Door into
Adjoining
Room,
Option 1
Option 3
WARNING:Thisapplianceis
equippedfor(naturalorpropane/
LP) gas. Field conversion is not
permitted.
12"
Figure 2 - Ventilation Air from Inside
Building
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INSTALLATION
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as, but
not limited to, tobacco smoke,
aromatic candles, cleaning flu-
ids, oil or kerosene lamps, etc.)
in the air exist, may discolor
walls or cause odors.
Continued
INSTALLATION ITEMS
Before installing heater, make sure you have the
items listed below.
•
•
•
•
•
•
•
•
external regulator (supplied by installer)
piping (check local codes)
sealant (resistant to propane/LP gas)
equipment shutoff valve *
ground joint union
sediment trap
tee joint
pipe wrench
* ACSAdesign-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. The optional CSA design-
certified equipment shutoff valve can be purchased
from your dealer. See Accessories, page 25.
IMPORTANT:Vent-free heaters add moisture to the
air. Although this is beneficial, installing heater in
rooms without enough ventilation air may cause
mildew to form from too much moisture. See Air for
Combustion and Ventilation, page 5. If high humid-
ity is experienced, a dehumidifier may be used to
help lower the water vapor content in the air.
LOCATING HEATER
This heater is designed to be mounted on a wall.
CAUTION: If you install the
heater in a home garage
• heater pilot and burner must
be at least 18 inches above
floor
WARNING: Maintain the
minimum clearances shown in
Figure 4. If you can, provide
greater clearances from floor,
ceiling, and joining wall.
• locate heater where moving
vehicle will not hit it
You can locate heater on floor, away from a wall.
An optional floor mounting stand is needed. Pur-
chase the floor mounting stand from your dealer.
See Accessories, page 25.
For convenience and efficiency, install heater
•
where there is easy access for operation, inspec-
tion, and service
•
in coldest part of room
WARNING: Never install the
heater
An optional fan kit is available from your dealer.
See Accessories, page 25. If planning to use fan,
locate heater near an electrical outlet.
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan36inches
from the front, top, or sides of
the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
CEILING
6"
36"
Minimum
Minimum
From
Sides Of
Heater
Right
Side
Left
Side
Minimum To
Top Surface
Of Carpeting,
2" Tile Or Other
Combustible
Material
FLOOR
Figure 4 - Mounting Clearances As
Viewed From Front of Heater
8
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INSTALLATION
Continued
THERMOSTAT SENSING BULB
(Thermostat Models Only)
The thermostat sensing bulb has been placed be-
low the heater.
1. Place clamp on thermostat sensing bulb as
shown in Figure 5. Clamp is provided in hard-
ware package.
2. Snap clamp into upper mounting hole as shown
in Figure 5. Mounting hole is located on lower
left edge on back of heater. Make sure the ther-
mostat sensing bulb is pointing up.
Figure 7 - Removing Front Panel Of
Heater
Methods For Attaching Mounting
Bracket To Wall
Only use last hole on each end of mounting bracket
to attach bracket to wall. These two holes are 14
inches apart from their centers. Attach mounting
bracket to wall in one of two ways:
Clamp
1. Attaching to wall stud
2. Attaching to wall anchor
Thermostat
Sensing Bulb
Attaching to Wall Stud: This method provides the
strongest hold. Insert mounting screws through
mounting bracket and into wall studs.
Figure 5 - Attaching Thermostat Sensing
Bulb
Attaching to WallAnchor: This method allows you
to attach mounting bracket to hollow walls (wall
areas between studs) or to solid walls (concrete or
masonry).
INSTALLING HEATER TO WALL
Mounting Bracket
Locate mounting bracket in heater carton. Remove
mounting bracket from heater carton.
Decide which method better suits your needs. Ei-
ther method will provide a secure hold for the
mounting bracket.
Marking Screw Locations
1. Tape mounting bracket to wall where heater
will be located. Make sure mounting bracket
is level.
Figure 6 - Mounting Bracket
WARNING: Maintain mini-
mum clearances shown in Fig-
ure8,page10.Ifyoucan,provide
greater clearances from floor
and joining wall.
Removing Front Panel Of Heater
1. Remove the four painted screws, two on each
side of front panel.
2. Pull bottom of front panel forward, then out.
3. Remove any remaining packaging materials.
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Attaching To Wall Anchor Method
For attaching mounting bracket to hollow walls
(wall areas between studs) or solid walls (concrete
or masonry)
INSTALLATION
Continued
2. Mark screw locations on wall (see Figure 8).
1. Drill holes at marked locations using 5/16"
drill bit. For solid walls (concrete or masonry),
drill at least 1" deep.
Note: Only mark last hole on each end of
mounting bracket. Insert mounting screws
through these holes only.
2. Fold wall anchor as shown in Figure 9.
3. Remove tape and mounting bracket from wall.
3. Insert wall anchor (wings first) into hole. Tap
anchor flush to wall.
12"
Min.
14"
4. For thin walls (1/2" or less), insert red key
into wall anchor. Push red key to “pop” open
anchor wings.
Only Insert Mounting
Screws Through Last
Hole On Each End
18 3/4
Min.
"
IMPORTANT: Do not hammer key!
For thick walls (over 1/2" thick) or solid walls,
do not pop open wings.
AdjoingWal
5. Place mounting bracket onto wall. Line up last
hole on each end of bracket with wall anchors.
Floor
6. Insert mounting screws through bracket and
into wall anchors.
30,000 Btu/Hr Models
7. Tighten screws until mounting bracket is
firmly fastened to wall.
8"
Min.
14"
Only Insert Mounting
Screws Through Last
Hole On Each End
18 3/4
Min.
"
Figure 9 - Folding Figure 10 - Popping
Anchor
Open Anchor Wings
For Thin Walls
AdjoingWal
Placing Heater On Mounting Bracket
1. Locate two horizontal slots on back panel of
heater.
Floor
2. Place heater onto mounting bracket. Slide
horizontal slots onto stand-out tabs on mount-
ing bracket.
20,000 Btu/Hr Models
Figure 8 - Mounting Bracket Clearances
Attaching Mounting Bracket To Wall
Note: Wall anchors, mounting screws, and spac-
ers are in hardware package. The hardware pack-
age is provided with heater.
Horizontal Slots
Attaching To Wall Stud Method
For attaching mounting bracket to wall studs
Stand-
Out Tab
1. Drill holes at marked locations using 9/64"
drill bit.
2. Place mounting bracket onto wall. Line up last
hole on each end of bracket with holes drilled
in wall.
Mounting Bracket
(attached to wall)
3. Insert mounting screws through bracket and
into wall studs.
Figure 11 - Mounting Heater Onto
Mounting Bracket
4. Tighten screws until mounting bracket is
firmly fastened to wall studs.
10
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MOUNTING HEATER TO FLOOR
WITH OPTIONAL FLOOR KIT
INSTALLATION
Continued
Mounting Base Feet to Heater
1. Lay heater cabinet on its back on a table with
the heater bottom overhanging the table edge.
Installing Bottom Mounting Screws
1. Locate two bottom mounting holes. These
holes are near bottom on back panel of heater
(see Figure 12).
2. Align holes in base foot with mounting holes
on bottom of cabinet (see Figure 13).
2. Mark screw locations on wall.
3. Secure base foot to heater using sheet metal
screws.
3. Remove heater from mounting bracket.
4. If installing bottom mounting screws into hol-
low or solid wall, install wall anchors. Fol-
low steps 1 through 4 under Attaching To Wall
Anchor Method, page 10.
4. Repeat for other side.
Wood
Screw
If installing bottom mounting screw into wall
stud, drill holes at marked locations using
9/64" drill bit.
5. Replace heater onto mounting bracket.
6. Place spacers between bottom mounting holes
and wall anchor or drilled hole.
7. Hold spacer in place with one hand. With other
hand, insert mounting screw through bottom
mounting hole and spacer. Place tip of screw
in opening of wall anchor or drilled hole.
Base Foot
8. Tighten both screws until heater is firmly se-
cured to wall. Do not over tighten.
Sheet Metal Screw
Note: Do not replace front panel at this time.
Replace front panel after making gas con-
nections and checking for leaks (see pages
12 through 14).
Figure 13 - Installing Base Feet
Mounting Base Feet to Floor (Where
required by local code)
1. Remove front panel (see Removing Front
Panel of Heater, page 9).
2. Position heater with base feet in desired loca-
tion. Mark holes for drilling. Remove heater
with base.
3. For carpeted floors, make a small cut with a
sharp knife at marked locations prior to drill-
ing. If mounting base to a wood floor, drill 1/8
inch diameter hole, 3/4 inch deep. (Do not use
anchors in wood floors).
Front View
If mounting base to a concrete floor, drill with
1/4 inch diameter concrete drill bit, 13/8 inches
into floor. Insert anchors completely into holes.
Heater
Wall
4. Reposition heater with base feet over holes.
Secure base to floor with wood screws. See
Figure 13.
Spacer
Side View
Figure 12 - Installing Bottom Mounting
Screws
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INSTALLATION
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
large enough diameter to allow
proper gas volume to heater. If
pipe is too small, undue loss of
volume will occur.
Continued
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 3/8" NPT (National
PipeThread)inletconnectionto
the pressure regulator.
WARNING: A qualified ser-
vicepersonmustconnectheater
to gas supply. Follow all local
codes.
Typical Inlet Pipe Diameters
GMP20PT, GMP16(T) - 3/8" or greater
GMP30BT, GMP26(T) - 1/2" or greater
Installation must include equipment shutoff valve,
union, and plugged 1/8" NPT tap. Locate NPT tap
within reach for test gauge hook up. NPT tap must
be upstream from heater (see Figure 15).
CAUTION: Never connect
heater directly to the propane/
LP supply. This heater requires
an external regulator (not sup-
plied). Install the external regu-
latorbetweentheheaterandpro-
pane/LP supply.
IMPORTANT:Install an equipment shutoff valve
in an accessible location. The equipment shutoff
valve is for turning on or shutting off the gas to
the appliance.
Pressure
Regulator
Heater
Cabinet
The installer must supply an external regulator.
The external regulator will reduce incoming gas
pressure. You must reduce incoming gas pressure
to between 11 and 14 inches of water. If you do
not reduce incoming gas pressure, heater regula-
tor damage could occur. Install the external regu-
lator with the vent pointing down as shown in Fig-
ure 14. Pointing the vent down protects it from
freezing rain or sleet.
3/8" NPT
Pipe Nipple
Ground Joint
Union
Tee Joint
Equipment
Shutoff
Valve *
Reducer
Bushing to
1/8" NPT
External Regulator
Propane/LP
Supply Tank
1/8" NPT
Plug Tap
Tee Joint
3" Min.
Pipe
Nipple
From External
Regulator
(11" W.C. to
14" W.C.
Pressure)
Vent
Pointing
Down
Cap
Figure 15 - Gas Connection
Figure 14 - External Regulator With Vent
Pointing Down
* ACSAdesign-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certified equipment shutoff valve from your
dealer. See Accessories, page 25.
12
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PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
INSTALLATION
Continued
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect appliance with its appliance main gas
valve (control valve) and equipment shutoff valve
from gas supply piping system. Pressures in ex-
cess of 1/2 psig will damage heater regulator.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from go-
ing into pipe. Excess sealant in pipe could result
in clogged heater valves.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
2. Cap off open end of gas pipe where equip-
ment shutoff valve was connected.
3. Pressurize supply piping system by opening
propane/LP supply tank valve or using com-
pressed air.
Install sediment trap in supply line as shown in
Figure 15, page 12. Locate sediment trap where it
is within reach for cleaning. Locate sediment trap
where trapped matter is not likely to freeze.Asedi-
ment trap traps moisture and contaminants. This
keeps them from going into heater controls. If sedi-
ment trap is not installed or is installed wrong,
heater may not run properly.
4. Check all joints of gas supply piping system.
Apply a noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve
togassupply. Checkreconnectedfittingsforleaks.
IMPORTANT: Hold the pressure regulator with Test Pressures Equal To or Less Than 1/2
wrench when connecting it to gas piping and/or PSIG (3.5 kPa)
fittings. Do not over tighten pipe connection to 1. Close equipment shutoff valve (see Figure 16).
regulator. The regulator body could be damaged.
2. Pressurize supply piping system by opening
propane/LP supply tank valve or using com-
pressed air.
CHECKING GAS CONNECTIONS
3. Check all joints from propane/LP supply tank
to equipment shutoff valve (see Figure 17).
Apply a noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak.
WARNING: Test all gas pip-
ing and connections, internal
and external to unit, for leaks
afterinstallingorservicing.Cor-
rect all leaks at once.
4. Correct all leaks at once.
Open
Equipment
Shutoff
Valve
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak de-
tectionfluidtoalljoints.Bubbles
forming show a leak. Correct all
leaks at once.
Closed
Figure 16 - Equipment Shutoff Valve
Thermostat Gas Valve
Propane/LP
Supply Tank
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply and
heater.SeeguidelinesunderCon-
necting to Gas Supply, page 12.
Equipment Shutoff Valve
Figure 17 - Checking Gas Joints for
Propane/LP Gas
113048-01C
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D. Do not use this appliance if any part has been
underwater. Immediately call a qualified ser-
vice technician to inspect the appliance and
to replace any part of the control system and
any gas control which has been under water.
INSTALLATION
Continued
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Figure 16,
page 13).
MANUAL CONTROL MODELS
2. Open propane/LP supply tank valve.
LIGHTING
INSTRUCTIONS
3. Make sure control knob of heater is in the
OFF position.
1. STOP! Read the safety information begin-
ning in column 1.
4. Check all joints from equipment shutoff valve
to thermostat gas valve (see Figure 17, page
13).Apply a noncorrosive leak detection fluid
to all joints. Bubbles forming show a leak.
2. Make sure equipment shutoff valve is
fully open.
3. Press in and turn control knob clockwise
to the OFF position.
5. Correct all leaks at once.
6. Light heater (see Operating Heater, page 14).
Check all other internal joints for leaks.
4. Wait five (5) minutes to clear out any gas.
Then smell for gas around heater and near
the floor. If you smell gas, STOP! Follow
“B” in the safety information in column 1.
If you don’t smell gas, go to the next step.
7. Turn off heater (see To Turn Off Gas to Appli-
ance, page 15 or 16).
8. Replace front panel.
5. Press in control knob and turn counter-
to the PILOT position.
OPERATING HEATER
FOR YOUR SAFETY
READ BEFORE LIGHTING
clockwise
Keep control knob pressed in for five (5)
seconds (see Figure 18).
Note: You may be running this heater for
the first time after hooking up to gas sup-
ply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.
WARNING: If you do not fol-
low these instructions exactly,
a fire or explosion may result
causing property damage, per-
sonal injury or loss of life.
• If control knob does not pop up when re-
leased, contact a qualified service person
or gas supplier for repairs.
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot,
follow these instructions exactly.
6. With control knob pressed in, push down
and release ignitor button. This will light
pilot. The pilot is attached to the front of
burner. If needed, keep pressing ignitor but-
ton until pilot lights.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
Ignitor Button Control Knob
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
OFF
IGNITOR
• Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
Figure 18 - Control Knob In The OFF
Position
• If you cannot reach your gas supplier, call
the fire 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 qualified service tech-
nician or gas supplier. Force or attempted
repair may result in a fire or explosion.
14
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Slightly press in control knob and turn coun-
terclockwise to the LOW, MED, or HI
positions (see Figure 20).
OPERATING HEATER
Continued
If pilot does not light
IMPORTANT: Release downward pressure
while turning control knob. Control knob will
lock at the desired position.
• turn control knob clockwise
OFF position
• repeat steps 5 and 6
to the
Control
Knob
If pilot does not stay lit after several tries
• refer to Troubleshooting, page 20
• contact a qualified service person or gas
supplier for repairs
GMP16
GMP26
LOW
HI
MED
LOW
T
ILO
O F F
P
Until repairs are made, light pilot with
match. To light pilot with match, see
Manual Lighting Procedure.
HI
MED
F F
O
LOW
7. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob.
MED
HIGH
OFF
O F F
HI
P I L O T
MED
LOW
Note: If pilot goes out, repeat steps 3
through 7.
L O
PILO
W
T
M E D
H I
8. Press in and turn control knob counter-
clockwise to the HIGH position. Set
control knob to desired heat setting.
OFF
Figure 20 - Burner Patterns for Non-
Thermostat Models
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
TO TURN OFF GAS
TO APPLIANCE
Thermocouple
Ignitor Electrode
Shutting Off Heater
1. Turn control knob clockwise
OFF position.
to the
Pilot Burner
2. Turn off all electric power to the appliance
if service is to be performed.
Shutting Off Burner Only (pilot stays lit)
Turn control knob clockwise
LOT position.
Figure 19 - Pilot (actual pilot may vary)
to the PI-
TO SELECT
HEATING LEVEL FOR
INFRARED HEATERS
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 7, page 9).
2. Follow steps 1 through 5 under Lighting In-
structions, page 14.
WARNING: When running
heater, setcontrolknobatLOW,
MED, or HI locked positions.
Never set control knob between
lockedpositions.Poorcombus-
tion and higher levels of carbon
monoxide may result.
3. With control knob pressed in, strike match.
Hold match to pilot until pilot lights.
4. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8,
under Lighting Instructions.
5. Replace front panel.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
113048-01C
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7. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob.
OPERATING HEATER
Continued
• If control knob does not pop up when re-
leased, contact a qualified service person
or gas supplier for repairs.
THERMOSTAT CONTROLLED
MODELS
Note: If pilot goes out, repeat steps 3
through 7. This heater has a safety inter-
lock system. Wait one (1) minute before
lighting pilot again.
LIGHTING
INSTRUCTIONS
1. STOP! Read the safety information.
2. Make sure equipment shutoff valve is
fully open.
8. Turn control knob counterclockwise
to desired heating level. The main burner
should light. Set control knob to any heat
level between 1 and 5.
3. Turn control knob clockwise
OFF position.
to the
4. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information. If you don’t smell gas,
go to the next step.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
5. Turn control knob counterclockwise
to the PILOT position. Press in control knob
for five (5) seconds (see Figure 21).
Thermocouple
Ignitor Electrode
Note: You may be running this heater for
the first time after hooking up to gas sup-
ply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.
Pilot Burner
• If control knob does not pop up when re-
leased, contact a qualified service person
or gas supplier for repairs.
Figure 22 - Pilot (actual pilot may vary)
6. Keep thermostat control knob pressed in
while pushing down and releasing the igni-
tor button (see Figure 21). This will light
pilot. If necessary, continue to press igni-
tor button until pilot lights.
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise
OFF position.
to the
If pilot does not light
• turn thermostat control knob clockwise
2. Turn off all electric power to the appliance
if service is to be performed.
Clockwise
to the OFF position
• repeat steps 5 and 6
If pilot does not stay lit after several tries
• refer to Troubleshooting, page 20.
• contact a qualified service person or gas
supplier
Shutting Off Burner Only (pilot stays lit)
Turn control knob clockwise
LOT position.
to the PI-
Until repairs are made, light pilot with
match. To light pilot with match, see
Manual Lighting Procedure, page 17.
Ignitor Button
Control Knob
T
O
L
I
P
F
F
O
Figure 21 - Control Knob In The OFF
Position
16
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OPERATING HEATER
INSPECTING HEATER
Continued
Check pilot flame pattern and burner flame pat-
tern often.
THERMOSTAT CONTROL
OPERATION
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern.
Figure 25 shows an incorrect pilot flame pat-
tern. The incorrect pilot flame is not touching
the thermocouple. This will cause the thermo-
couple to cool. When the thermocouple cools,
the heater will shut down.
The thermostatic control used on these models
differs from standard thermostats. Standard
thermostats simply turn on and off the burner.
The thermostat used on this heater senses the
room temperature. The thermostat adjusts the
amount of gas flow to the burner. This increases
or decreases the burner flame height. At times
the room may exceed the set temperature. If so,
the burner will shut off. The burner will cycle
back on when room temperature drops below
the set temperature. The control knob can be
set to any heat level between 1 and 5. Selecting
setting 5 will cause the burner to remain fully
on without modulating down in most cases.
If pilot flame pattern is incorrect, as shown in
Figure 25
•
turn heater off (see To Turn Off Gas to Appli-
ance, page 16)
•
see Troubleshooting, page 20
Thermocouple
Blue Flame
Pilot Burner
Note: The thermostat sensing bulb measures
the temperature of air near the heater cabinet.
This may not always agree with room tempera-
ture (depending on housing construction, instal-
lation location, room size, open air tempera-
tures, etc.). Frequent use of your heater will let
you determine your own comfort levels.
Control
Knob GMP16T
GMP26T
Figure 24 - Correct Pilot Flame Pattern
Thermocouple
T
O
L
I
P
F
F
O
Yellow Flame
T
O
L
I
P
F
F
O
Pilot
Burner
Figure 23 - Burner Patterns for Infrared
Heaters Only
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 7, page 9).
Figure 25 - Incorrect Pilot Flame Pattern
2. Follow steps 1 through 5 under Lighting In-
structions, page 16.
3. With control knob pressed in, strike match.
Hold match to pilot until pilot lights.
4. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8,
under Lighting Instructions, page 16.
5. Replace front panel.
113048-01C
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BURNER FLAME PATTERN FOR
INFRARED HEATERS
INPECTING HEATER
Continued
BURNER FLAME PATTERN FOR
BLUE FLAME HEATERS
Figure 28 shows a correct burner flame pattern. Fig-
ure 29 shows an incorrect burner flame pattern.
If burner flame pattern is incorrect, as shown in
Figure 29
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide.
•
turn heater off (see To Turn Off Gas to Appli-
ance, page 15 [non-thermostat models] or page
16 [thermostat models]))
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles enter the
heater and burn causing brief
patches of orange flame.
Figure 28 - Correct Burner Flame Pattern
for Infrared Heaters
Figure 26 shows a correct burner flame pattern.
Figure 27 shows an incorrect burner flame pat-
tern. The incorrect burner flame pattern shows
yellow tipping of the flame. It also shows the flame
higher than 1/2 the glass panel height.
If burner flame pattern is incorrect, as shown in
Figure 27
•
turn heater off (see To Turn Off Gas to Appli-
ance, page 15 [non-thermostat models] or page
16 [thermostat models]))
Bad Burner Pattern-Plaque
GRH/OV 019
•
see Troubleshooting, page 20
Figure 29 - Incorrect Burner Flame
Pattern for Infrared Heaters
Blue
Flame
11/2 Glass
Height
Figure 26 - Correct Burner Flame Pattern
for Blue Flame Heaters
Yellow
Tipping
1/2 Glass
Height
Figure 27 - Incorrect Burner Flame
Pattern for Blue Flame Heaters
18
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3. Blow air through the ports/slots and holes in
the burner.
CLEANING AND
MAINTENANCE
4. Never insert objects into the pilot tube.
Clean the pilot assembly also. A yellow tip on the
pilot flame indicates dust and dirt in the pilot as-
sembly. There is a small pilot air inlet about two
inches from where the pilot flame comes out of
the pilot assembly (see Figure 30). With the unit
off, lightly blow air through the air inlet. You may
blow through a drinking straw if compressed air
is not available.
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner, and cir-
culating air passageways of
heater clean. Inspect these ar-
eas of heater before each use.
Haveheaterinspectedyearlyby
a qualified service person.
Heater may need more frequent
cleaning due to excessive lint
from carpeting, bedding mate-
rial, pet hair, etc.
Pilot Assembly
Pilot Air Inlet
WARNING: Failure to keep
theprimaryairopening(s)ofthe
burner(s) clean may result in
sooting and property damage.
Figure 30 - Pilot Inlet Air
CABINET
Air Passageways
•
Use a vacuum cleaner or pressurized air to clean.
Exterior
Use a soft cloth dampened with a mild soap and
water mixture. Wipe the cabinet to remove dust.
ODS/PILOT AND BURNER
•
•
Use a vacuum cleaner, pressurized air, or small,
soft bristled brush to clean.
BURNER PILOT AIR INLET
The primary air inlet holes allow the proper
amount of air to mix with the gas. This provides a
clean burning flame. Keep these holes clear of dust,
dirt, and lint. Clean these air inlet holes prior to
each heating season. Blocked air holes will create
soot. We recommend that you clean the unit every
three months during operation and have heater
inspected yearly by a qualified service person.
We also recommend that you keep the burner tube
and pilot assembly clean and free of dust and dirt.
To clean these parts we recommend using com-
pressed air no greater than 30 PSI. Your local com-
puter store, hardware store, or home center may
carry compressed air in a can. You can use a
vacuum cleaner in the blow position. If using com-
pressed air in a can, please follow the directions
on the can. If you don't follow directions on the
can, you could damage the pilot assembly.
1. Shut off the unit, including the pilot. Allow
the unit to cool for at least thirty minutes.
2. Inspect burner, pilot for dust and dirt.
113048-01C
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TROUBLESHOOTING
WARNING: Turn off and unplug heater and let cool before servic-
ing. Only a qualified service person should service and repair heater.
CAUTION: Never use a wire, needle, or similar object to clean
ODS/pilot. This can damage ODS/pilot unit.
Note: All troubleshooting items are listed in order of operation.
OBSERVED PROBLEM
POSSIBLE CAUSE
REMEDY
When ignitor button is pressed,
there is no spark at ODS/pilot
1. Ignitor electrode positioned 1. Replace pilot assembly
wrong
2. Ignitor electrode broken
2. Replace pilot assembly
3. Ignitor electrode not con- 3. Reconnect ignitor cable
nected to ignitor cable
4. Ignitor cable pinched or wet 4. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
5. Broken ignitor cable
6. Bad piezo ignitor
5. Replace ignitor cable
6. Replace piezo ignitor
When ignitor button is pressed,
there is spark at ODS/pilot but no
ignition
1. Gas supply turned off or equip- 1. Turn on gas supply or open
ment shutoff valve closed equipment shutoff valve
2. Control knob not in PILOT 2. Turn control knob to PILOT
position position
3. Control knob not pressed in 3. Press in control knob while in
while in PILOT position PILOT position
4. Air in gas lines when installed 4. Continue holding down con-
trol knob. Repeat igniting op-
eration until air is removed
5. Depleted gas supply
6. ODS/pilot is clogged
5. Contact local propane/LP gas
company
6. Clean ODS/pilot (see Cleaning
and Maintenance, page 19) or
replace ODS/pilot assembly
7. Gas regulator setting is not 7. Replace gas regulator
correct
20
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TROUBLESHOOTING
Continued
OBSERVED PROBLEM POSSIBLE CAUSE
REMEDY
ODS/pilot lights but flame goes 1. Control knob not fully 1. Press in control knob fully
outwhencontrolknobisreleased
pressed in
2. Control knob not pressed in 2. AfterODS/pilotlights, keepcon-
long enough trol knob pressed in 30 seconds
3. Safety interlock system has 3. Wait one minute for safety in-
been triggered
terlock system to reset. Repeat
ignition operation
4. Equipment shutoff valve not 4. Fully open equipment shutoff
fully open valve
5. Thermocouple connection 5. Hand tighten until snug, then
loose at control valve tighten 1/4 turn more
6. Pilot flame not touching ther- 6. A) Contact local propane/LP
mocouple, which allows
thermocouple to cool, caus-
ing pilot flame to go out. This
problem could be caused by
one or both of the following:
A) Low gas pressure
gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance,
page 19) or replace ODS/pilot
assembly
B) Dirty or partially clogged
ODS/pilot
7. Thermocouple damaged
8. Control valve damaged
7. Replace pilot assembly
8. Replace control valve
Burner does not light after ODS/ 1. Burner orifice is clogged
pilot is lit
1. Clean burner (see Cleaning
and Maintenance, page 19) or
replace burner orifice
2. Inlet gas pressure is too low 2. Contact local propane/LP gas
company
Delayed ignition of burner
1. Manifold pressure is too low 1. Contact local propane/LP gas
company
2. Burner orifice is clogged
2. Clean burner (see Cleaning
and Maintenance, page 19) or
replace burner orifice
Burner backfiring during com- 1. Burner orifice is clogged or 1. Clean burner (see Cleaning
bustion
damaged
and Maintenance, page 19) or
replace burner orifice
2. Replace burner
2. Burner damaged
3. Gas regulator defective
3. Replace gas regulator
113048-01C
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TROUBLESHOOTING
Continued
OBSERVED PROBLEM
POSSIBLE CAUSE
REMEDY
Yellowflameduringburnercom- 1. Not enough air
bustion
1. Check burner for dirt and de-
bris. If found, clean burner
(see Cleaning and Mainte-
nance, page 19)
2. Gas regulator defective
3. Clogged or dirty burner
2. Replace gas regulator
3. Clean burner (see Cleaning
and Maintenance, page 19)
Slight smoke or odor during ini- 1. Residues from manufactur- 1. Problem will stop after a few
ing processes
tial operation hours of operation
Heaterproducesawhistlingnoise 1. Turning control knob to HI 1. Turn control knob to LO or
when burner is lit
or to position 5 when burner
is cold
2. Air in gas line
position 1 and let warm up for
a minute
2. Operate burner until air is re-
moved from line. Have gas
line checked by local propane/
LP gas company
3. Air passageways on heater 3. Observe minimum installation
blocked
clearances (see Figure 4, page8)
4. Dirty or partially clogged 4. Clean burner (see Cleaning
burner orifice
and Maintenance, page 19) or
replace burner orifice
White powder residue forming 1. When heated, vapors from 1. Turn heater off when using
within burner box or on adjacent
walls or furniture
furniture polish, wax, carpet
cleaners, etc. may turn into
white powder residue
furniture polish, wax, carpet
cleaners, or similar products
22
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TROUBLESHOOTING
Continued
WARNING: If you smell gas
• Shut off gas supply.
• 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 fire department.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning supplies,
paint, paint remover, cigarette smoke, cements and glues, new carpet or textiles, etc., create fumes.
These fumes may mix with combustion air and create odors.
OBSERVED PROBLEM
POSSIBLE CAUSE
REMEDY
Heater produces a clicking/tick- 1. Metal expanding while heat- 1. This is common with most heat-
ing noise just after burner is lit or
shut off
ing or contracting while
cooling
ers. If noise is excessive, con-
tact qualified service person
Heater produces unwanted odors 1. Heater burning vapors from 1. Ventilate room. Stop using
paint, hair spray, glues, etc.
(see important statement
above)
odor causing products while
heater is running
2. Low fuel supply (propane/LP 2. Refill supply tank
gas only)
3. Gas leak. See Warning
statement above
3. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 13)
Heater shuts off in use (ODS op- 1. Not enough fresh air is avail- 1. Open window and/or door for
erates)
able
2. Low line pressure
ventilation
2. Contact local propane/LP gas
company
3. ODS/pilot is partially 3. Clean ODS/pilot (see Cleaning
clogged and Maintenance, page 19)
Gas odor even when control knob 1. Gas leak. See Warning 1. Locate and correct all leaks
is in OFF position
statement above
(see Checking Gas Connec-
tions, page 13)
2. Replace control valve
2. Control valve defective
Gas odor during combustion
1. Foreign matter between con- 1. Take apart gas tubing and re-
trol valve and burner move foreign matter
2. Gas leak. See Warning 2. Locate and correct all leaks
statement above
(see Checking Gas Connec-
tions, page 13)
Moisture/condensationnoticedon 1. Not enough combustion/ven- 1. Refer to Air for Combustion
windows
tilation air
and Ventilation requirements
(page 5)
113048-01C
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SPECIFICATIONS
GMP30BT
15,000/30,000
GMP20BT
10,000/20,000
Btu (Variable)
Type Gas
Propane/LP Only
Piezo
Propane/LP Only
Piezo
Ignition
Pressure Regulator Setting
Inlet Gas Pressure (in. of water)
Maximum
8" W.C.
8" W.C.
14"
11"
14"
11"
Minimum
Dimensions, Inches (H x W x D)
Heater (Includes knobs & grill)
Carton
24 1/4 x 25 3/4 x 7
26 3/8 x 28 1/8 x 10
24 1/4 x 18 1/4 x 7
26 3/8 x 20 7/8 x 10
Weight (pounds)
Heater
28
33
20
25
Shipping
GMP16
GMP26
GMP16T
GMP26T
Btu (Variable)
Type Gas
6,000/11,000/16,000
Propane/LP Only
Piezo
6,000/16,000/26,000
Propane/LP Only
Piezo
Ignition
Pressure Regulator Setting
Inlet Gas Pressure* (in. of water)
Maximum
8" W.C.
8" W.C.
14"
11"
14"
11"
Minimum
Dimensions, Inches (H x W x D)
Heater
24 1/4 x 18 1/4 x 7
26 3/8 x 20 7/8 x 10
24 1/4 x 25 3/4 x 7
26 3/8 x 28 1/8 x 10
Carton
Weight (pounds)
Heater
20
25
28
33
Shipping
Note: Dimensions listed are outer most pointson the heater (includes control knobs and grill).
* For purposes of input adjustment.
24
113048-01C
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SERVICE HINTS
When Gas Pressure Is Too Low
ACCESSORIES
Purchase these heater accessories from your local
dealer. If they can not supply these accessories, call
DESA Heating Products at 1-866-672-6040 for re-
ferral information. You can also write to the address
listed on the back page of this manual.
•
•
•
•
pilot will not stay lit
burner will have delayed ignition
heater will not produce specified heat
propane/LP gas supply may be low
You may feel your gas pressure is too low. If
so, contact your local propane/LP gas supplier.
TECHNICAL SERVICE
You may have further questions about installation,
operation, or troubleshooting. If so, contact DESA
Heating Products’ Technical Service Department
at 1-866-672-6040. When calling please have your EQUIPMENT SHUTOFF VALVE
model and serial numbers of your heater ready.
GA5010
For all models. Equipment shutoff valve with
1/8" NPT tap.
You can also visit DESA Heating Products’ tech-
nical service web site at www.desatech.com.
SERVICE PUBLICATIONS
You can purchase a service manual from the address
listed on the back page of this manual. Send a check
for $5.00 payable to DESA Heating Products
REPLACEMENT PARTS
Note: Use only original replacement parts. This
will protect your warranty coverage for parts re-
placed under warranty.
FAN KITS - GA3250T
For all models. Provides better heat distribution.
Makes heater more efficient. Complete installa-
tion and operating instructions included.
PARTS UNDER WARRANTY
Thermostatically-controlled, blower turns itself on
and off as required.
Contact authorized dealers of this product. If they
can’t supply original replacement part(s), call
DESA Heating Products’ Technical Service De-
partment at 1-866-672-6040.
When calling DESA Heating Products, have ready
•
•
•
•
•
•
your name
your address
model and serial numbers of your heater
how heater was malfunctioning
type of gas used (propane/LP or natural gas)
purchase date
Usually, we will ask you to return the part to the
factory.
BASE KIT - GA4550
PARTS NOT UNDER WARRANTY
For all models. For locating heater on the floor,
away from a wall. Complete installation and op-
erating instructions included.
Contact authorized dealers of this product. If they
can’t supply original replacement part(s) call
DESA Heating Products at 1-866-672-6040 for re-
ferral information.
ELECTRONIC IGNITOR KIT - GA435
Not Shown
When calling DESA Heating Products, have ready
•
•
.
model number of your heater
the replacement part number
For all piezo ignitor models. Provides easier light-
ing of the pilot.
113048-01C
25
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ILLUSTRATED PARTS BREAKDOWN
MODELS GMP16, GMP26, GMP16T, AND GMP26T
7
5
17
6
14
11
15
4
8
16
See Pages
28 & 29
9
10
2
13
12
3
1
26
113048-01C
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PARTS LIST
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 25 of this manual.
KEY
PART NUMBER
GMP26 GMP16T
NO. GMP16
GMP26T
DESCRIPTION
QTY.
1
2
3
4
5
6
7
8
107673-01 107676-01 107673-01 107676-01 Front Panel
103476-01 103476-02 103476-01 103476-02 Grill Guard
1
1
1
1
1
1
1
1
1
1
1
1
1
1
**
107894-01 107894-02 107894-01 107894-02 Reflector Assembly
** ** ** ** Cabinet Back Panel
**
**
**
Apron
097159-04 097159-04 097159-04 097159-04 Piezo Ignitor
099066-02 099066-02 099066-02 099066-02 Mounting Bracket
098271-09 098271-09 098271-09 098271-09 Ignitor Cable
9
098462-01 098462-01
098325-01 098325-01
098354-03 098354-03
____
____
____
____
____
____
Control Rod Assembly
Roll Pin
Control Knob
10
11
12
13
14
15
099415-18 099415-18 099415-18 099415-18 Gas Regulator
104819-02 104819-02 104819-02 104819-02 Regulator Bracket
____
____
____
____
098522-24 098522-24 Thermostat Gas Valve
102394-02 102394-02 Thermostat Valve
Mounting Bracket
16
17
____
____
109303-04 109303-03 109303-04 109303-03 Baffle
103256-02 103256-02 Inlet Tube
1
1
PARTS AVAILABLE-NOT SHOWN
100642-03 100642-03 100642-03 100642-03 Hardware Assembly
109483-01 109483-01 109483-01 109483-01 Lighting Instruction Plate
105345-01 105345-01 105345-01 105345-01 Cable Tie
1
1
1
1
107888-01 107888-01 107888-01 107888-01 Control Position Label
** Not a field replaceable part.
113048-01C
27
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ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST
MODELS GMP16 AND GMP26
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 25 of this manual.
1
2
5
13
6
7
1
2
3
8
11
ODS/Pilot
10
4
5
9
6
4
7
1
2
8
Burner Assembly GMP16
3
7
11
10
12
12
4
13
10
9
4
Burner Assembly
GMP26
KEY
PART NUMBER
NO. GMP16
GMP26
DESCRIPTION
QTY.
1
2
110803-02* 110803-02* ODS/Pilot
110186-01 110186-01 Thermocouple Kit
1
1
3
4
5
098200-03 098200-03 Control Valve Bracket
105051-01 105050-02 Pilot Tubing
099218-08 099218-09 Burner
1
1
1
6
098508-01 098508-01 Valve Retainer Nut
1
7
8
9
099056-25 099056-25 Injector - Plaque A or C
099056-01 099056-01 Injector - Plaque B
103844-01 100747-01 Control Valve
1-2
1
1
10
11
12
13
103352-03 103353-04 Tubing-Valve to Plaque A
103352-04 103353-05 Tubing-Valve to Plaque B
103353-06 Tubing-Valve to Plaque C
107660-01 107660-03 Inlet Tube
1
1
1
1
_____
* If replacing ODS pilot and your model is pre 2002, your part
number will be 103894-04.The thermocouple part number will be
098514-01. The electrode part number will be 098594-01.
28
113048-01C
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ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST
MODELS GMP16T AND GMP26T
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 25 of this manual.
1
2
5
6
1
2
ODS/Pilot
7
3
5
4
Burner Assembly GMP16T
6
1
2
7
6
3
4
Burner Assembly GMP26T
KEY
PART NUMBER
GMP26T
NO. GMP16T
DESCRIPTION
QTY.
1
2
3
4
5
6
7
110803-02* 110803-02* ODS/Pilot
110186-01 110186-01 Thermocouple Kit
099387-11 099387-03 Pilot Tubing
104818-03 104818-04 Outlet Tubing
099218-08 099218-09 Burner
1
1
1
1
1
099056-25 099056-25 Injector - Plaque A or C 1-2
099056-01 099056-01 Injector - Plaque B
1
* If replacing ODS pilot and your model is pre 2002, your part
number will be 103894-04.The thermocouple part number will
be 098514-01. The electrode part number will be 098594-01.
113048-01C
29
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ILLUSTRATED PARTS BREAKDOWN
MODELS GMP20BT AND GMP30BT
15
7
1
20
4
10
17
12
13
11
10
18
9
14
19
8
16
6
5
3
2
30
113048-01C
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PARTS LIST
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 25 of this manual.
KEY
PART NUMBER
GMP30BT
NO. GMP20BT
DESCRIPTION
QTY.
1
2
3
4
5
6
7
8
097159-04 097159-04 Piezo Ignitor
107673-01 107676-01 Front Panel
103476-01 103476-02 Grill Guard
098522-11 098522-13 Thermostat Gas Valve
104189-01 104189-02 Bottom Glass Retainer
098260-09 098260-10 Glass
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
**
**
Cabinet
107894-10 107894-11 Deflector Assembly
098271-09 098271-09 Ignitor Cable
098249-01 098249-01 Nut
110803-02 110803-02 ODS/Pilot Assembly
110186-01 110186-01 Thermocouple Kit
103446-01 103447-01 Burner
099387-03 099387-03 Pilot Tubing
103845-05 103845-07 Injector
099066-02 099066-02 Mounting Bracket
099415-18 099415-18 Gas Regulator
9
10
11
12
13
14
15
16
17
18
19
20
NJF 8C
NJF 8C
Hex Nut
103255-02 103255-02 Outlet Tubing
103256-02 103256-02 Inlet Tubing
109303-04 109303-03 Baffle
PARTS AVAILABLE — NOT SHOWN
100642-03 100642-03 Hardware Assembly
107888-01 107888-01 Control Position Label
111051-01 111051-01 Lighting Instruction Label
1
1
1
** Not a field replaceable part.
113048-01C
31
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WARRANTY INFORMATION
KEEP THIS WARRANTY
Model _______________________________
Serial No. ____________________________
Date of Purchase ______________________
Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our
standard written warranty. We make no other warranty, expressed or implied.
LIMITED WARRANTY
VENT-FREE RESIDENTIAL GAS HEATERS
DESA Heating Products warrants this product to be free from defects in materials and components for two (2)
years from the date of first purchase, provided that the product has been properly installed, operated and
maintained in accordance with all applicable instructions. To make a claim under this warranty the Bill of Sale
or cancelled check must be presented.
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required
to restore this heater to proper operating condition and an allowance for labor when provided by a DESA
Heating Products Authorized Service Center. Warranty part(s) MUST be obtained through authorized dealers
of this product and/or DESA Heating Products who will provide original factory replacement parts. Failure to
use original factory replacement parts voids this warranty. The heater MUST be installed by a qualified in-
staller in accordance with all local codes and instructions furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear, or
parts that fail or become damaged as a result of misuse, accidents, lack of proper maintenance or defects
caused by improper installation. Travel, diagnostic cost, labor, transportation and any and all such other costs
related to repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE
SALE OF THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EX-
PRESSED WARRANTIESAND LIMITS THE DURATION OF ANYANDALL IMPLIED WARRANTIES,
INCLUDING WARRANTIES OF MERCHANTABILITYAND FITNESS FORAPARTICULAR PURPOSE
TO TWO (2) YEARS ON ALL COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESA
HEATING PRODUCTS’LIABILITY IS HEREBYLIMITED TO THE PURCHASE PRICE OF THE PROD-
UCTAND DESAHEATING PRODUCTS SHALLNOT BE LIABLE FORANYOTHER DAMAGES WHAT-
SOEVER INCLUDING INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of
incidental or consequential damages, so the above limitation on implied warranties, or exclusion or limitation
on damages may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.
For information about this warranty write:
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
113048-01
Rev. C
04/04
113048 01
NOT A UPC
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