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.
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.
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.
SAFETY INFORMATION PRODUCT IDENTIFICATION 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 Combustion 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.
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.
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.
AIR FOR COMBUSTION AND VENTILATION Outlet Air Continued Outlet Air 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).
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.
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.
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. Adjoining Wall 12" Min. 14" Only Insert Mounting Screws Through Last Hole On Each End 18 3/4" Min. Floor 30,000 Btu/Hr Models Adjoining Wall 8" Min. 14" Only Insert Mounting Screws Through Last Hole On Each End 18 3/4" Min.
MOUNTING HEATER TO FLOOR WITH OPTIONAL FLOOR KIT 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.
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.
PRESSURE TESTING GAS SUPPLY PIPING SYSTEM 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.
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).
F T OF PILO W PILOT LO MED OFF HI ME D OT LOW PIL HIGH MED T OFF HI 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.
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.
OPERATING HEATER INSPECTING HEATER Continued Check pilot flame pattern and burner flame pattern often. 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.
INPECTING HEATER Continued BURNER FLAME PATTERN FOR BLUE FLAME HEATERS WARNING: If yellow tipping occurs, your heater could produce increased levels of carbon monoxide. BURNER FLAME PATTERN FOR INFRARED HEATERS Figure 28 shows a correct burner flame pattern. Figure 29 shows an incorrect burner flame pattern.
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. WARNING: Failure to keep the primary air opening(s) of the burner(s) clean may result in sooting and property damage.
TROUBLESHOOTING WARNING: Turn off and unplug heater and let cool before servicing. 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 wrong 2. Ignitor electrode broken 3.
TROUBLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE REMEDY ODS/pilot lights but flame goes out when control knob is released 1. Control knob not fully pressed in 2. Control knob not pressed in long enough 3. Safety interlock system has been triggered 1. Press in control knob fully 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.
TROUBLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE Yellow flame during burner com- 1. Not enough air bustion 2. Gas regulator defective 3. Clogged or dirty burner REMEDY 1. Check burner for dirt and debris. If found, clean burner (see Cleaning and Maintenance, page 19) 2. Replace gas regulator 3. Clean burner (see Cleaning and Maintenance, page 19) Slight smoke or odor during ini- 1. Residues from manufacturtial operation ing processes 1.
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.
SPECIFICATIONS Btu (Variable) Type Gas Ignition Pressure Regulator Setting Inlet Gas Pressure (in. of water) Maximum Minimum Dimensions, Inches (H x W x D) Heater (Includes knobs & grill) Carton Weight (pounds) Heater Shipping Btu (Variable) Type Gas Ignition Pressure Regulator Setting Inlet Gas Pressure* (in. of water) Maximum Minimum Dimensions, Inches (H x W x D) Heater Carton Weight (pounds) Heater Shipping GMP30BT 15,000/30,000 Propane/LP Only Piezo 8" W.C.
SERVICE HINTS ACCESSORIES 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. 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.
ILLUSTRATED PARTS BREAKDOWN MODELS GMP16, GMP26, GMP16T, AND GMP26T 5 7 17 6 14 11 15 4 8 16 See Pages 28 & 29 9 10 2 13 12 3 1 26 www.desatech.
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.
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 4 6 7 1 2 8 Burner Assembly GMP16 10 3 7 11 12 12 4 13 10 Burner Assembly GMP26 KEY NO.
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 NO.
ILLUSTRATED PARTS BREAKDOWN MODELS GMP20BT AND GMP30BT 15 7 1 20 4 10 17 12 13 11 9 10 14 18 19 8 16 6 3 5 2 30 www.desatech.
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 NO.
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.