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 instructions.
• 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.
Save this manual for future reference.
For more information, visit www.desatech.com
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual for correct installation
and operational procedures. For assistance or additional information consult a qualified installer, service
agency, or the gas supplier.
WARNING: This is an unvented gas-fired heater. It uses
air (oxygen) from the room in which it is installed.
Provisions for adequate combustion and ventilation air
must be provided. Refer to Air for Combustion and
Ventilation section on page 5 of this manual.
This appliance may be installed in an aftermarket,*
permanently located, manufactured (mobile) home,
where not prohibited by local codes.
This appliance is only for use with the type of gas
indicated on the rating plate. This appliance is not
convertible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
TABLE OF CONTENTS
Safety Information ............................................... 3
Local Codes ........................................................ 4
Product Identification .......................................... 4
Unpacking ........................................................... 4
Product Features ................................................ 4
Air For Combustion and Ventilation ..................... 5
Installation ........................................................... 7
Operating Heater .............................................. 14
Inspecting Heater .............................................. 17
Cleaning and Maintenance ............................... 19
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Troubleshooting ................................................. 20
Specifications .................................................... 24
Service Hints ..................................................... 25
Technical Service .............................................. 25
Service Publications .......................................... 25
Replacement Parts ........................................... 25
Accessories ....................................................... 25
Illustrated Parts Breakdown and Parts List ....... 26
Warranty Information.......................... Back Cover
SAFETY INFORMATION
WARNING: This product contains and/or generates chemicals
known to the State of California
to cause cancer or birth defects,
or other reproductive harm.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate, or service this heater. Improper use of this heater can
cause serious injury or death
from burns, fire, explosion, electrical shock, and carbon monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of car-
bon monoxide poisoning resemble the flu, with headaches, 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 alcohol, and those at high altitudes.
Propane/LP Gas: Propane/LP gas 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.
Make certain you read and understand all warnings. Keep this manual for reference. It is your
guide to safe and proper operation of this heater.
WARNING: Any change to
this heater or its controls can be
dangerous.
WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not approved for use with this heater.
Due to high temperatures, the
appliance should be located out
of traffic and away from furniture and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
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 remain hot for a time after shutdown. Allow surface to cool before touching.
Carefully supervise young children when they are in the same
room with heater.
Make sure grill guard is in place
before running heater.
Keep the appliance area clear
and free from combustible materials, gasoline and other flammable vapors and liquids.
1. This appliance is only for use with the type of
gas indicated on the rating plate. This appliance is not convertible for use with other gases.
2. Do not place propane/LP supply tank(s) inside any structure. Locate propane/LP supply
tank(s) outdoors.
3. This heater shall not be installed in a bedroom
or bathroom.
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
• if you cannot reach your gas supplier, call
the fire department
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SAFETY INFORMATION
Continued
5. This heater needs fresh, outside air ventilation to run properly. This heater has an Oxygen 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.
6. Keep all air openings in front and bottom of
heater clear and free of debris. This will insure enough air for proper combustion.
7. If heater shuts off, do not relight until you provide fresh, outside air. If heater keeps shutting off, have it serviced.
8. Do not run heater
• where flammable liquids or vapors are used
or stored
• under dusty conditions
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.
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.
11. Turn off and let cool before servicing. Only a
qualified service person should service and
repair heater.
12. Operating heater above elevations of 4,500
feet could cause pilot outage.
13. To prevent performance problems, do not use
propane/LP fuel tank of less than 100 lbs.
capacity.
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*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
PRODUCT
IDENTIFICATION
Heater
Cabinet
Front Panel
Ignitor Button
Figure 1 - Vent-Free Gas Heater
Control Knob
Grill Guard
Glass Panel
UNPACKING
1. Remove heater from carton.
2. Remove all protective packaging applied to
heater for shipment.
3. Check heater for any shipping damage. If
heater is damaged, promptly inform dealer
where you bought heater.
PRODUCT FEATURES
SAFETY DEVICE
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 heaters. The ODS/pilot shuts off the heater if there is
not enough fresh air.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system requires no matches, batteries, or other sources to
light heater.
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.
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AIR FOR COMBUSTION
AND VENTILATION
WARNING: This heater shall
not be installed in a confined
space or unusually tight construction unless provisions are
provided for adequate combustion and ventilation air. Read
the following instructions to insure proper fresh air for this
and other fuel-burning appliances in your home.
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.
While it is good to make your home energy efficient, your home needs to breathe. Fresh air must
enter your home. All fuel-burning appliances need
fresh air for proper combustion and ventilation.
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 following ventilation classifications:
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 windows may provide enough fresh air for
combustion and ventilation. However, in
buildings of unusually tight construction,
you must provide additional fresh air.
Unusually tight construction is defined as
construction where:
a. walls and ceilings exposed to the out-
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6x10
less with openings gasketed or sealed
and
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, between wall panels, at penetrations for
plumbing, electrical, and gas lines, and
at other openings.
If your home meets all of the three criteria
above, you must provide additional fresh
air. See Ventilation
page 7.
If your home does not meet all of the three
criteria above, proceed to
Fresh-Air Flow For Heater Location
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 unconfined 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 appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed*, through openings not furnished with doors, are considered a part of the
unconfined space.
* Adjoining rooms are communicating only if there
are doorless passageways or ventilation grills between them.
-11
kg per pa-sec-m2) or
Air From Outdoors
Determining
, page 6.
,
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AIR FOR COMBUSTION
AND VENTILATION
Continued
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 confined or unconfined space.
Space: Includes the room in which you will install
heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.
1. Determine the volume of the space (length x
width x height).
Length x Width x Height =__________cu. ft.
(volume of space)
Example: Space size 20 ft. (length) x 16 ft.
(width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)
If additional ventilation to adjoining room is supplied 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:
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 ______________ Btu/Hr
Gas water heater* ______________ Btu/Hr
Gas furnace ______________ 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:
Gas water heater _________ Btu/Hr
Vent-free heater + _________ Btu/Hr
Total = _________ Btu/Hr
4. Compare the maximum Btu/Hr the space can
support with the actual amount of Btu/Hr used.
2560 cu. ft. (volume of space) x 20 =
40,000
20,000
60,000
______________ Btu/Hr (maximum the space
can support)
______________ Btu/Hr (actual amount of
Btu/Hr used)
Example:
51,200 Btu/Hr (maximum the space can support)
60,000 Btu/Hr (actual amount of Btu/Hr used)
The space in the above example is a confined space
because the actual Btu/Hr used is more than the maximum Btu/Hr the space can support. You must provide additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an ad-
joining room. If the extra space provides an unconfined space, remove door to adjoining room
or add ventilation grills between rooms. See Ven-
tilation Air From Inside Building, page 7.
B. Vent room directly to the outdoors. See Ventila-
tion Air From Outdoors, page 7.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size
makes room unconfined.
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.
WARNING: If the area in
which the heater may be operated is smaller than that defined
as an unconfined space or if the
building is of unusually tight
construction, provide adequate
combustion and ventilation air
by one of the methods described
in the
National Fuel Gas Code,
ANSI Z223.1/NFPA 54 Section
5.3
or applicable local codes
.
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AIR FOR COMBUSTION
AND VENTILATION
Continued
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining
unconfined space, you must provide two permanent 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.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills
or ducts. You must provide two permanent openings: 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:
or outlet air into attic if attic has a thermostat-controlled power vent. Heated air entering the attic
will activate the power vent.
Do not provide openings for inlet
Ventilated
Attic
Crawl Space
Ventilated
To Attic
To
Crawl
Space
Outlet
Air
Inlet
Air
Outlet
Air
Inlet Air
Figure 3 - Ventilation Air from Outdoors
INSTALLATION
NOTICE: This heater is intended
for use as supplemental heat.
Use this heater along with your
primary heating system. Do not
install this heater as your primary heat source. If you have a
central heating system, you may
run system’s circulating blower
while using heater. This will help
circulate the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
12"
Ventilation Grills
Ventilation
Grills
into Adjoining
Room,
Option 1
Or
Remove
Door into
Adjoining
Room,
Option 3
Into Adjoining Room,
12"
Option 2
Figure 2 - Ventilation Air from Inside
Building
WARNING: A qualified service person must install heater.
Follow all local codes.
CHECK GAS TYPE
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.
WARNING: This appliance is
equipped for (natural or propane/
LP) gas. Field conversion is not
permitted.
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INSTALLATION
,
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
* A CSA design-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. The optional CSA designcertified equipment shutoff valve can be purchased
from your dealer. See Accessories, page 25.
LOCATING HEATER
This heater is designed to be mounted on a wall.
WARNING: Maintain the
minimum clearances shown in
Figure 4. If you can, provide
greater clearances from floor,
ceiling, and joining wall.
You can locate heater on floor, away from a wall.
An optional floor mounting stand is needed. Purchase the floor mounting stand from your dealer.
See Accessories, page 25.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objects are less than 36 inches
from the front, top, or sides of
the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
CAUTION: This heater creates warm air currents. These
currents move heat to wall surfaces 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 fluids, oil or kerosene lamps, etc.)
in the air exist, may discolor
walls or cause odors.
IMPORTANT:
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 humidity is experienced, a dehumidifier may be used to
help lower the water vapor content in the air.
Vent-free heaters add moisture to the
CAUTION: If you install the
heater in a home garage
• heater pilot and burner must
be at least 18 inches above
floor
• locate heater where moving
vehicle will not hit it
For convenience and efficiency, install heater
• where there is easy access for operation, inspection, and service
• in coldest part of room
An optional fan kit is available from your dealer.
See Accessories, page 25. If planning to use fan,
locate heater near an electrical outlet.
CEILING
6"
Minimum
From
Sides Of
Heater
Left
Side
FLOOR
Figure 4 - Mounting Clearances As
Viewed From Front of Heater
36"
Minimum
Right
Side
Minimum To
Top Surface
Of Carpeting
2"
Tile Or Other
Combustible
Material
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INSTALLATION
Continued
THERMOSTAT SENSING BULB
(Thermostat Models Only)
The thermostat sensing bulb has been placed below the heater.
1. Place clamp on thermostat sensing bulb as
shown in Figure 5. Clamp is provided in hardware 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 thermostat sensing bulb is pointing up.
Clamp
Thermostat
Sensing Bulb
Figure 5 - Attaching Thermostat Sensing
Bulb
INSTALLING HEATER TO WALL
Mounting Bracket
Locate mounting bracket in heater carton. Remove
mounting bracket from heater carton.
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:
1. Attaching to wall stud
2. Attaching to wall anchor
Attaching to Wall Stud: This method provides the
strongest hold. Insert mounting screws through
mounting bracket and into wall studs.
Attaching to Wall Anchor: This method allows you
to attach mounting bracket to hollow walls (wall
areas between studs) or to solid walls (concrete or
masonry).
Decide which method better suits your needs. Either 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
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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WARNING: Maintain minimum clearances shown in Figure 8, page 10. If you can, provide
greater clearances from floor
and joining wall.
INSTALLATION
Continued
2. Mark screw locations on wall (see Figure 8).
Note:
Only mark last hole on each end of
mounting bracket. Insert mounting screws
through these holes only.
3. Remove tape and mounting bracket from wall.
12"
Min.
Only Insert Mounting
Screws Through Last
Adjoining Wall
30,000 Btu/Hr Models
8"
Min.
14"
Hole On Each End
Floor
14"
18 3/4"
Min.
Attaching To Wall Anchor Method
For attaching mounting bracket to hollow walls
(wall areas between studs) or solid walls (concrete
or masonry)
1. Drill holes at marked locations using 5/16"
drill bit. For solid walls (concrete or masonry),
drill at least 1" deep.
2. Fold wall anchor as shown in Figure 9.
3. Insert wall anchor (wings first) into hole. Tap
anchor flush to wall.
4. For thin walls (1/2" or less), insert red key
into wall anchor. Push red key to “pop” open
anchor wings.
IMPORTANT:
Do not hammer key!
For thick walls (over 1/2" thick) or solid walls,
do not pop open wings.
5. Place mounting bracket onto wall. Line up last
hole on each end of bracket with wall anchors.
6. Insert mounting screws through bracket and
into wall anchors.
7. Tighten screws until mounting bracket is
firmly fastened to wall.
Only Insert Mounting
Screws Through Last
Hole On Each End
Adjoining Wall
Floor
18 3/4"
Min.
20,000 Btu/Hr Models
Figure 8 - Mounting Bracket Clearances
Attaching Mounting Bracket To Wall
Note:
Wall anchors, mounting screws, and spacers are in hardware package. The hardware package is provided with heater.
Attaching To Wall Stud Method
For attaching mounting bracket to wall studs
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.
3. Insert mounting screws through bracket and
into wall studs.
4. Tighten screws until mounting bracket is
firmly fastened to wall studs.
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Figure 9 - Folding
Anchor
Figure 10 - Popping
Open Anchor Wings
For Thin Walls
Placing Heater On Mounting Bracket
1. Locate two horizontal slots on back panel of
heater.
2. Place heater onto mounting bracket. Slide
horizontal slots onto stand-out tabs on mounting bracket.
Horizontal Slots
StandOut Tab
Mounting Bracket
(attached to wall)
Figure 11 - Mounting Heater Onto
Mounting Bracket
INSTALLATION
Continued
Installing Bottom Mounting Screws
1. Locate two bottom mounting holes. These
holes are near bottom on back panel of heater
(see Figure 12).
2. Mark screw locations on wall.
3. Remove heater from mounting bracket.
4. If installing bottom mounting screws into hollow or solid wall, install wall anchors. Follow steps 1 through 4 under Attaching To Wall
Anchor Method, page 10.
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.
8. Tighten both screws until heater is firmly secured to wall. Do not over tighten.
Note:
Do not replace front panel at this time.
Replace front panel after making gas connections and checking for leaks (see pages
12 through 14).
Front View
Heater
Side View
Figure 12 - Installing Bottom Mounting
Screws
Wall
Spacer
MOUNTING HEATER TO FLOOR
WITH OPTIONAL FLOOR KIT
Mounting Base Feet to Heater
1. Lay heater cabinet on its back on a table with
the heater bottom overhanging the table edge.
2. Align holes in base foot with mounting holes
on bottom of cabinet (see Figure 13).
3. Secure base foot to heater using sheet metal
screws.
4. Repeat for other side.
Wood
Screw
Base Foot
Sheet Metal Screw
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 location. 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 drilling. If mounting base to a wood floor, drill 1/8
inch diameter hole, 3/4 inch deep. (Do not use
anchors in wood floors).
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.
4. Reposition heater with base feet over holes.
Secure base to floor with wood screws. See
Figure 13.
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INSTALLATION
Continued
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 3/8" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualified service person must connect heater
to gas supply. Follow all local
codes.
CAUTION: Never connect
heater directly to the propane/
LP supply. This heater requires
an external regulator (not supplied). Install the external regulator between the heater and propane/LP supply.
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 regulator damage could occur. Install the external regulator with the vent pointing down as shown in Figure 14. Pointing the vent down protects it from
freezing rain or sleet.
Propane/LP
Supply Tank
Figure 14 - External Regulator With Vent
External Regulator
Vent
Pointing
Down
Pointing Down
CAUTION: Use only new,
black iron or steel pipe. Internally-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.
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).
IMPORTANT:
in an accessible location. The equipment shutoff
valve is for turning on or shutting off the gas to
the appliance.
3/8" NPT
Pipe Nipple
Test Gauge Connection*
* A CSA design-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.
Install an equipment shutoff valve
Pressure
Regulator
Ground Joint
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Tee Joint
Pipe
Nipple
Cap
Sediment Trap
Figure 15 - Gas Connection
Union
Equipment
Shutoff
Valve *
3" Min.
From External
Regulator
(11" W.C. to
14" W.C.
Pressure)
Heater
Cabinet
12
www.desatech.com 113048-01C
INSTALLATION
Continued
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from going 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.
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. A sediment trap traps moisture and contaminants. This
keeps them from going into heater controls. If sediment trap is not installed or is installed wrong,
heater may not run properly.
IMPORTANT:
wrench when connecting it to gas piping and/or
fittings. Do not over tighten pipe connection to
regulator. The regulator body could be damaged.
CHECKING GAS CONNECTIONS
ing and connections, internal
and external to unit, for leaks
after installing or servicing. Correct all leaks at once.
open flame to check for a leak.
Apply a noncorrosive leak detection fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
nal regulator has been installed
between propane/LP supply and
heater. See guidelines under
necting to Gas Supply
Hold the pressure regulator with
WARNING: Test all gas pip-
WARNING: Never use an
CAUTION: Make sure exter-
Con-
, page 12.
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
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 excess of 1/2 psig will damage heater regulator.
2. Cap off open end of gas pipe where equipment shutoff valve was connected.
3. Pressurize supply piping system by opening
propane/LP supply tank valve or using compressed air.
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
to gas supply. Check reconnected fittings for leaks.
Test Pressures Equal To or Less Than 1/2
PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 16).
2. Pressurize supply piping system by opening
propane/LP supply tank valve or using compressed air.
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.
4. Correct all leaks at once.
Equipment
Shutoff
Valve
Figure 16 - Equipment Shutoff Valve
Thermostat Gas Valve
Propane/LP
Supply Tank
Open
Closed
Equipment Shutoff Valve
Figure 17 - Checking Gas Joints for
www.desatech.com 13113048-01C
Propane/LP Gas
OFF
IGNITOR
INSTALLATION
Continued
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Figure 16,
page 13).
2. Open propane/LP supply tank valve.
3. Make sure control knob of heater is in the
OFF position.
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.
5. Correct all leaks at once.
6. Light heater (see Operating Heater, page 14).
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appli-
ance, page 15 or 16).
8. Replace front panel.
OPERATING HEATER
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: If you do not follow these instructions exactly,
a fire or explosion may result
causing property damage, personal injury or loss of life.
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot,
follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
• Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
• 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 technician or gas supplier. Force or attempted
repair may result in a fire or explosion.
14
D. Do not use this appliance if any part has been
under water. Immediately call a qualified service technician to inspect the appliance and
to replace any part of the control system and
any gas control which has been under water.
MANUAL CONTROL MODELS
LIGHTING
INSTRUCTIONS
1. STOP! Read the safety information beginning in column 1.
2. Make sure equipment shutoff valve is
fully open.
3. Press in and turn control knob clockwise
to the OFF position.
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.
5. Press in control knob and turn counterclockwise to the PILOT position.
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 supply. 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.
• If control knob does not pop up when re-
leased, contact a qualified service person
or gas supplier for repairs.
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 button until pilot lights.
Ignitor Button Control Knob
Figure 18 - Control Knob In The OFF
Position
www.desatech.com 113048-01C
OPERATING HEATER
Continued
If pilot does not light
• turn control knob 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 for repairs
Until repairs are made, light pilot with
match. To light pilot with match, see
Manual Lighting Procedure.
7. Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds,
release control knob.
Note:
If pilot goes out, repeat steps 3
through 7.
8. Press in and turn control knob counterclockwise to the HIGH position. Set
control knob to desired heat setting.
CAUTION: Do not try to adjust heating levels by using the
equipment shutoff valve.
Thermocouple
Ignitor Electrode
Pilot Burner
Figure 19 - Pilot (actual pilot may vary)
TO SELECT
HEATING LEVEL FOR
INFRARED HEATERS
WARNING: When running
heater, set control knob at LOW,
MED, or HI locked positions.
Never set control knob between
locked positions. Poor combustion and higher levels of carbon
monoxide may result.
CAUTION: Do not try to adjust heating levels by using the
equipment shutoff valve.
Slightly press in control knob and turn counterclockwise to the LOW, MED, or HI
positions (see Figure 20).
IMPORTANT:
Release downward pressure
while turning control knob. Control knob will
lock at the desired position.
Control
Knob GMP16 GMP26
HI
MED
LOW
T
OFF
ILO
P
LOW
HI
MED
FF
O
LOW
PILOT
OFF
HI
PILOT
MED
LOW
LO
PILO
W
T
MED
OFF
HI
MED
HIGH
OFF
Figure 20 - Burner Patterns for Non-
Thermostat Models
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise to the
OFF position.
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 to the PILOT position.
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 7, page 9).
2. Follow steps 1 through 5 under Lighting In-
structions, page 14.
3. With control knob pressed in, strike match.
Hold match to pilot until pilot lights.
4. Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8,
under Lighting Instructions.
5. Replace front panel.
www.desatech.com 15113048-01C
OPERATING HEATER
Continued
THERMOSTAT CONTROLLED
MODELS
LIGHTING
INSTRUCTIONS
1. STOP! Read the safety information.
2. Make sure equipment shutoff valve is
fully open.
3. Turn control knob clockwise to the
OFF position.
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.
5. Turn control knob counterclockwise
to the PILOT position. Press in control knob
for five (5) seconds (see Figure 21).
Note:
You may be running this heater for
the first time after hooking up to gas supply. 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.
• If control knob does not pop up when re-
leased, contact a qualified service person
or gas supplier for repairs.
6. Keep thermostat control knob pressed in
while pushing down and releasing the ignitor button (see Figure 21). This will light
pilot. If necessary, continue to press ignitor button until pilot lights.
If pilot does not light
• turn thermostat control knob clockwise
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
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
7. Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds,
release control knob.
• If control knob does not pop up when re-
leased, contact a qualified service person
or gas supplier for repairs.
Note:
If pilot goes out, repeat steps 3
through 7. This heater has a safety interlock system. Wait one (1) minute before
lighting pilot again.
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.
CAUTION: Do not try to adjust heating levels by using the
equipment shutoff valve.
Thermocouple
Ignitor Electrode
Pilot Burner
Figure 22 - Pilot (actual pilot may vary)
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise to the
OFF position.
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 to the PILOT position.
Figure 21 - Control Knob In The OFF
Position
16
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OPERATING HEATER
Continued
THERMOSTAT CONTROL
OPERATION
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.
Note:
The thermostat sensing bulb measures
the temperature of air near the heater cabinet.
This may not always agree with room temperature (depending on housing construction, installation location, room size, open air temperatures, etc.). Frequent use of your heater will let
you determine your own comfort levels.
Control
Knob GMP16T GMP26T
T
O
L
I
P
F
F
O
INSPECTING HEATER
Check pilot flame pattern and burner flame pattern often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern.
Figure 25 shows an incorrect pilot flame pattern. The incorrect pilot flame is not touching
the thermocouple. This will cause the thermocouple to cool. When the thermocouple cools,
the heater will shut down.
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
Figure 24 - Correct Pilot Flame Pattern
Thermocouple
T
O
L
I
P
F
F
O
Figure 23 - Burner Patterns for Infrared
Heaters Only
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 7, page 9).
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 seconds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8,
under Lighting Instructions, page 16.
5. Replace front panel.
www.desatech.com 17113048-01C
Yellow Flame
Pilot
Burner
Figure 25 - Incorrect Pilot Flame Pattern
G
G
INPECTING HEATER
Continued
BURNER FLAME PATTERN FOR
BLUE FLAME HEATERS
WARNING: If yellow tipping
occurs, your heater could produce increased levels of carbon
monoxide.
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 26 shows a correct burner flame pattern.
Figure 27 shows an incorrect burner flame pattern. 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]))
• see Troubleshooting, page 20
Blue
Flame
1
/2 Glass
1/2
Height
BURNER FLAME PATTERN FOR
INFRARED HEATERS
Figure 28 shows a correct burner flame pattern. Figure 29 shows an incorrect burner flame pattern.
If burner flame pattern is incorrect, as shown in
Figure 29
• turn heater off (see To Turn Off Gas to Appli-
ance, page 15 [non-thermostat models] or page
16 [thermostat models]))
Figure 28 - Correct Burner Flame Pattern
for Infrared Heaters
Figure 29 - Incorrect Burner Flame
Pattern for Infrared Heaters
Figure 26 - Correct Burner Flame Pattern
for Blue Flame Heaters
Yellow
Tipping
1
/2 Glass
1/2
Height
Figure 27 - Incorrect Burner Flame
Pattern for Blue Flame Heaters
18
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CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner, and circulating air passageways of
heater clean. Inspect these areas of heater before each use.
Have heater inspected yearly by
a qualified service person.
Heater may need more frequent
cleaning due to excessive lint
from carpeting, bedding material, pet hair, etc.
3. Blow air through the ports/slots and holes in
the burner.
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 assembly. 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.
Pilot Assembly
Pilot Air Inlet
WARNING: Failure to keep
the primary air opening(s) of the
burner(s) clean may result in
sooting and property damage.
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 compressed air no greater than 30 PSI. Your local computer 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 compressed 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.
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.
www.desatech.com 19113048-01C
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
When ignitor button is pressed,
there is no spark at ODS/pilot
When ignitor button is pressed,
there is spark at ODS/pilot but no
ignition
POSSIBLE CAUSE
1. Ignitor electrode positioned
wrong
2. Ignitor electrode broken
3. Ignitor electrode not connected to ignitor cable
4. Ignitor cable pinched or wet
5. Broken ignitor cable
6. Bad piezo ignitor
1. Gas supply turned off or equipment shutoff valve closed
2. Control knob not in PILOT
position
3. Control knob not pressed in
while in PILOT position
4. Air in gas lines when installed
5. Depleted gas supply
6. ODS/pilot is clogged
7. Gas regulator setting is not
correct
REMEDY
1. Replace pilot assembly
2. Replace pilot assembly
3. Reconnect ignitor cable
4. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
5. Replace ignitor cable
6. Replace piezo ignitor
1. Turn on gas supply or open
equipment shutoff valve
2. Turn control knob to PILOT
position
3. Press in control knob while in
PILOT position
4. Continue holding down control knob. Repeat igniting operation until air is removed
5. Contact local propane/LP gas
company
6. Clean ODS/pilot (see Cleaning
and Maintenance, page 19) or
replace ODS/pilot assembly
7. Replace gas regulator
20
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OBSERVED PROBLEM
ODS/pilot lights but flame goes
out when control knob is released
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Control knob not fully
pressed in
2. Control knob not pressed in
long enough
3. Safety interlock system has
been triggered
4. Equipment shutoff valve not
fully open
5. Thermocouple connection
loose at control valve
6. Pilot flame not touching thermocouple, which allows
thermocouple to cool, causing pilot flame to go out. This
problem could be caused by
one or both of the following:
A) Low gas pressure
B) Dirty or partially clogged
ODS/pilot
7. Thermocouple damaged
8. Control valve damaged
REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep control knob pressed in 30 seconds
3. Wait one minute for safety interlock system to reset. Repeat
ignition operation
4. Fully open equipment shutoff
valve
5. Hand tighten until snug, then
tighten 1/4 turn more
6. A) Contact local propane/LP
gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance,
page 19) or replace ODS/pilot
assembly
7. Replace pilot assembly
8. Replace control valve
Burner does not light after ODS/
pilot is lit
Delayed ignition of burner
Burner backfiring during combustion
1. Burner orifice is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice is clogged
1. Burner orifice is clogged or
damaged
2. Burner damaged
3. Gas regulator defective
www.desatech.com 21113048-01C
1. Clean burner (see Cleaning
and Maintenance, page 19) or
replace burner orifice
2. Contact local propane/LP gas
company
1. Contact local propane/LP gas
company
2. Clean burner (see Cleaning
and Maintenance, page 19) or
replace burner orifice
1. Clean burner (see Cleaning
and Maintenance, page 19) or
replace burner orifice
2. Replace burner
3. Replace gas regulator
OBSERVED PROBLEM
Yellow flame during burner combustion
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Not enough air
2. Gas regulator defective
3. Clogged or dirty burner
REMEDY
1. Check burner for dirt and de-
bris. If found, clean burner
(see Cleaning and Mainte-
nance, page 19)
2. Replace gas regulator
3. Clean burner (see Cleaning
and Maintenance, page 19)
Slight smoke or odor during initial operation
Heater produces a whistling noise
when burner is lit
White powder residue forming
within burner box or on adjacent
walls or furniture
1. Residues from manufacturing processes
1. Turning control knob to HI
or to position 5 when burner
is cold
2. Air in gas line
3. Air passageways on heater
blocked
4. Dirty or partially clogged
burner orifice
1. When heated, vapors from
furniture polish, wax, carpet
cleaners, etc. may turn into
white powder residue
1. Problem will stop after a few
hours of operation
1. Turn control knob to LO or
position 1 and let warm up for
a minute
2. Operate burner until air is removed from line. Have gas
line checked by local propane/
LP gas company
3. Observe minimum installation
clearances (see Figure 4, page 8)
4. Clean burner (see Cleaning
and Maintenance, page 19) or
replace burner orifice
1. Turn heater off when using
furniture polish, wax, carpet
cleaners, or similar products
22
www.desatech.com 113048-01C
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:
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
Heater produces a clicking/ticking noise just after burner is lit or
shut off
Heater produces unwanted odors
Heater shuts off in use (ODS operates)
Gas odor even when control knob
is in OFF position
Operating heater where impurities in air exist may create odors. Cleaning supplies,
POSSIBLE CAUSE
1. Metal expanding while heating or contracting while
cooling
1. Heater burning vapors from
paint, hair spray, glues, etc.
(see
important
above)
2. Low fuel supply (propane/LP
gas only)
3. Gas leak. See Warning
statement above
1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially
clogged
1. Gas leak. See Warning
statement above
2. Control valve defective
statement
REMEDY
1. This is common with most heaters. If noise is excessive, contact qualified service person
1. Ventilate room. Stop using
odor causing products while
heater is running
2. Refill supply tank
3. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 13)
1. Open window and/or door for
ventilation
2. Contact local propane/LP gas
company
3. Clean ODS/pilot (see Cleaning
and Maintenance, page 19)
1. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 13)
2. Replace control valve
Gas odor during combustion
Moisture/condensation noticed on
windows
1. Foreign matter between control valve and burner
2. Gas leak. See Warning
statement above
1. Not enough combustion/ventilation air
www.desatech.com 23113048-01C
1. Take apart gas tubing and remove foreign matter
2. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 13)
1. Refer to Air for Combustion
and Ventilation requirements
(page 5)
SPECIFICATIONS
Btu (Variable) 15,000/30,000 10,000/20,000
Type Gas Propane/LP Only Propane/LP Only
Ignition Piezo Piezo
Pressure Regulator Setting 8" W.C. 8" W.C.
Inlet Gas Pressure (in. of water)
Maximum 14" 14"
Minimum 11" 11"
Dimensions, Inches (H x W x D)
Heater (Includes knobs & grill) 24 1/4 x 25 3/4 x 7 24 1/4 x 18 1/4 x 7
Carton 26 3/8 x 28 1/8 x 10 26 3/8 x 20 7/8 x 10
Weight (pounds)
Heater 28 20
Shipping 33 25
Btu (Variable) 6,000/11,000/16,000 6,000/16,000/26,000
Type Gas Propane/LP Only Propane/LP Only
Ignition Piezo Piezo
Pressure Regulator Setting 8" W.C. 8" W.C.
Inlet Gas Pressure* (in. of water)
Maximum 14" 14"
Minimum 11" 11"
Dimensions, Inches (H x W x D)
Heater 24 1/4 x 18 1/4 x 7 24 1/4 x 25 3/4 x 7
Carton 26 3/8 x 20 7/8 x 10 26 3/8 x 28 1/8 x 10
Weight (pounds)
Heater 20 28
Shipping 25 33
Note:
Dimensions listed are outer most pointson the heater (includes control knobs and grill).
* For purposes of input adjustment.
GMP30BT GMP20BT
GMP16 GMP26
GMP16T GMP26T
24
www.desatech.com 113048-01C
SERVICE HINTS
When Gas Pressure Is Too Low
• 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
model and serial numbers of your heater ready.
You can also visit DESA Heating Products’ technical 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 replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If they
can’t supply original replacement part(s), call
DESA Heating Products’ Technical Service Department 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.
PARTS NOT UNDER WARRANTY
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 referral information.
When calling DESA Heating Products, have ready
• model number of your heater
• the replacement part number
.
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 referral information. You can also write to the address
listed on the back page of this manual.
EQUIPMENT SHUTOFF VALVE
GA5010
For all models. Equipment shutoff valve with
1/8" NPT tap.
FAN KITS - GA3250T
For all models. Provides better heat distribution.
Makes heater more efficient. Complete installation and operating instructions included.
Thermostatically-controlled, blower turns itself on
and off as required.
BASE KIT - GA4550
For all models. For locating heater on the floor,
away from a wall. Complete installation and operating instructions included.
ELECTRONIC IGNITOR KIT - GA435
Not Shown
For all piezo ignitor models. Provides easier lighting of the pilot.
www.desatech.com 25113048-01C
ILLUSTRATED PARTS BREAKDOWN
MODELS GMP16, GMP26, GMP16T, AND GMP26T
5
17
14
15
4
16
See Pages
28 & 29
9
10
2
3
7
6
11
8
13
12
1
26
www.desatech.com 113048-01C
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
NO. GMP16 GMP26 GMP16T GMP26T DESCRIPTION QTY.
1 107673-01 107676-01 107673-01 107676-01 Front Panel 1
2 103476-01 103476-02 103476-01 103476-02 Grill Guard 1
3 ** ** ** ** Apron 1
4 107894-01 107894-02 107894-01 107894-02 Reflector Assembly 1
5 ** ** ** ** Cabinet Back Panel 1
6 097159-04 097159-04 097159-04 097159-04 Piezo Ignitor 1
7 099066-02 099066-02 099066-02 099066-02 Mounting Bracket 1
8 098271-09 098271-09 098271-09 098271-09 Ignitor Cable 1
9 098462-01 098462-01 ____ ____ Control Rod Assembly 1
10 098325-01 098325-01 ____ ____ Roll Pin 1
11 098354-03 098354-03 ____ ____ Control Knob 1
12 099415-18 099415-18 099415-18 099415-18 Gas Regulator 1
13 104819-02 104819-02 104819-02 104819-02 Regulator Bracket 1
14 ____ ____ 098522-24 098522-24 Thermostat Gas Valve 1
15 ____ ____ 102394-02 102394-02 Thermostat Valve
16 ____ ____ 103256-02 103256-02 Inlet Tube 1
17 109303-04 109303-03 109303-04 109303-03 Baffle 1
PARTS AVAILABLE-NOT SHOWN
100642-03 100642-03 100642-03 100642-03 Hardware Assembly 1
109483-01 109483-01 109483-01 109483-01
105345-01 105345-01 105345-01 105345-01 Cable Tie 1
107888-01 107888-01 107888-01 107888-01 Control Position Label 1
** Not a field replaceable part.
Mounting Bracket
Lighting Instruction Plate
1
www.desatech.com 27113048-01C
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
13
5
7
1
2
11
4
Burner Assembly GMP16
KEY PART NUMBER
NO. GMP16 GMP26 DESCRIPTION QTY.
1 110803-02* 110803-02* ODS/Pilot 1
2 110186-01 110186-01 Thermocouple Kit 1
3 098200-03 098200-03 Control Valve Bracket 1
4 105051-01 105050-02 Pilot Tubing 1
5 099218-08 099218-09 Burner 1
6 098508-01 098508-01 Valve Retainer Nut 1
7 099056-25 099056-25 Injector - Plaque A or C 1-2
8 099056-01 099056-01 Injector - Plaque B 1
9 103844-01 100747-01 Control Valve 1
10 103352-03 103353-04 Tubing-Valve to Plaque A 1
11 103352-04 103353-05 Tubing-Valve to Plaque B 1
_____
12
13 107660-01 107660-03 Inlet Tube 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.
6
3
8
10
9
4
7
1
2
8
11
10
4
Burner Assembly
GMP26
103353-06 Tubing-Valve to Plaque C 1
ODS/Pilot
12
10
5
6
7
4
3
12
13
9
28
www.desatech.com 113048-01C
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.
5
6
1
2
7
1
2
ODS/Pilot
3
4
Burner Assembly GMP16T
6
1
2
Burner Assembly GMP26T
KEY PART NUMBER
NO. GMP16T GMP26T DESCRIPTION QTY.
1 110803-02* 110803-02* ODS/Pilot 1
2 110186-01 110186-01 Thermocouple Kit 1
3 099387-11 099387-03 Pilot Tubing 1
4 104818-03 104818-04 Outlet Tubing 1
5 099218-08 099218-09 Burner 1
6 099056-25 099056-25 Injector - Plaque A or C 1-2
7 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.
5
7
6
3
4
www.desatech.com 29113048-01C
ILLUSTRATED PARTS BREAKDOWN
MODELS GMP20BT AND GMP30BT
7
20
4
12
13
11
10
9
8
3
6
5
18
14
16
15
1
10
17
19
2
30
www.desatech.com 113048-01C
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
NO. GMP20BT GMP30BT DESCRIPTION QTY.
1 097159-04 097159-04 Piezo Ignitor 1
2 107673-01 107676-01 Front Panel 1
3 103476-01 103476-02 Grill Guard 1
4 098522-11 098522-13 Thermostat Gas Valve 1
5 104189-01 104189-02 Bottom Glass Retainer 1
6 098260-09 098260-10 Glass 1
7 ** ** Cabinet 1
8 107894-10 107894-11 Deflector Assembly 1
9 098271-09 098271-09 Ignitor Cable 1
10 098249-01 098249-01 Nut 2
11 110803-02 110803-02 ODS/Pilot Assembly 1
110186-01 110186-01 Thermocouple Kit 1
12 103446-01 103447-01 Burner 1
13 099387-03 099387-03 Pilot Tubing 1
14 103845-05 103845-07 Injector 1
15 099066-02 099066-02 Mounting Bracket 1
16 099415-18 099415-18 Gas Regulator 1
17 NJF 8C NJF 8C Hex Nut 1
18 103255-02 103255-02 Outlet Tubing 1
19 103256-02 103256-02 Inlet Tubing 1
20 109303-04 109303-03 Baffle 1
PARTS AVAILABLE — NOT SHOWN
100642-03 100642-03 Hardware Assembly 1
107888-01 107888-01 Control Position Label 1
111051-01 111051-01 Lighting Instruction Label 1
** Not a field replaceable part.
www.desatech.com 31113048-01C
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 installer 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 EXPRESSED WARRANTIES AND LIMITS THE DURATION OF ANY AND ALL IMPLIED WARRANTIES,
INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
TO TWO (2) YEARS ON ALL COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESA
HEATING PRODUCTS’ LIABILITY IS HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA HEATING PRODUCTS SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER 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
www.desatech.com
113048 01
NOT A UPC
113048-01
Rev. C
04/04
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