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Desa A Owner's Operation And Installation Manual

Blue-flame vent-free propane gas heater, heater sizes: 18,000 btu/hr non-thermostat, 18,000 btu/hr thermostat, and 28,000 btu/hr thermostat “a” model heaters
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BLUE-FLAME VENT-FREE
PROPANE GAS HEATER
OWNER'S OPERATION AND INSTALLATION MANUAL
Heater Sizes: 18,000 BTU/Hr Non-Thermostat,
18,000 BTU/Hr Thermostat, and 28,000 BTU/Hr Thermostat
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 qualified installer, service
agency, or the gas supplier.
"A" Model Heaters
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  • Page 1 Heater Sizes: 18,000 BTU/Hr Non-Thermostat, 18,000 BTU/Hr Thermostat, and 28,000 BTU/Hr Thermostat 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.

  • Page 2: Table Of Contents

    Propane Gas: Propane gas is odorless. An odor-making agent is added to propane gas. The odor helps you detect a propane gas leak. However, the odor added to propane gas can fade. Propane gas may be present even though no odor exists.
  • Page 3 13. Make sure grill guard is in place before running heater. 14. 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.

  • Page 4: Product Identification

    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 Only) Thermostat models have a thermostat sensing bulb and a control valve.

  • Page 5: Fresh Air For Combustion And Ventilation

    Confined Space A confined space has an air volume of less than 50 cubic feet for each 1000 BTU/Hr input rating of all appliances in the space (cubic feet equals length x width x height of space). Include adjoining rooms only if there are doorless passageways or ventilation grills between the rooms.
  • Page 6 58,000 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.
  • Page 7 FRESH AIR COMBUSTION VENTILATION Continued 099573 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"...
  • Page 8 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-controlled power vent. Heated air entering the attic will activate the power vent.

  • Page 9: Installing To 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 30.
  • Page 10 TO WALL Continued WARNING ICON 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 •...
  • Page 11 This method allows you to attach mounting bracket to Attaching to wall anchor 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. Mounting...
  • Page 12 INSTALLING TO WALL Continued Marking Screw Locations 1. Tape mounting bracket to wall where heater will be located. Make sure mount- ing bracket is level. WARNING ICON G 001 Maintain minimum clearances shown in Figure 8. If you can, pro- vide greater clearances from floor and joining wall.
  • Page 13 INSTALLING TO WALL Continued 099573 4. For thin walls (1/2" or less), insert red key into wall anchor. Push red key to “pop” open anchor wings. IMPORTANT: For thick walls (over 1/2" thick) or solid walls, do not pop open wings. Figure 10 - Popping Open Anchor Wings For Thin Walls 5.

  • Page 14: Connecting To Gas Supply

    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.

  • Page 15: Checking Gas Connections

    Nipple Figure 14 - Gas Connection * An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge connection. Purchase the optional A.G.A. design-certified manual shutoff valve from your dealer. See Accessories, page 30.
  • Page 16 4. Check all joints from manual shutoff valve to thermostat gas valve (thermostat models) or control valve (non-thermostat model) (see Figure 16). Apply mixture of liquid soap and water to gas joints. Bubbles forming show a leak. 5. Correct all leaks at once.

  • Page 17: Operating Heater (Thermostat Models)

    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.
  • Page 18 Thermocouple Figure 18 - Pilot 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 main burner should light. Set control knob to any heat level between HI and LO.

  • Page 19: Thermostat Control Operation

    OPERATING HEATER Thermostat Models Continued 099573 TO TURN OFF GAS TO APPLIANCE Shutting Off Heater 1. Turn control knob clockwise 2. Turn off all electric power to the appliance if service is to be performed. Shutting Off Burner Only (pilot stays lit) 1.

  • Page 20: Operating Heater (Non-Thermostat Model)

    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.
  • Page 21 8. Turn control knob counterclockwise main burner should light. Set control knob to any heat level between HIGH and LOW. To turn control knob from LOW to a higher setting, press in the control knob and turn counterclockwise Both HIGH and LOW are locked positions. You must press in control Note: knob before turning it from these positions.

  • Page 22: Inspecting Burner

    Check pilot flame pattern and burner flame pattern often. PILOT FLAME PATTERN Figure 21 shows a correct pilot flame pattern. Figure 22 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.
  • Page 23 • see Troubleshooting, pages 24 through 27 BURNER FLAME PATTERN Figure 23 shows a correct burner flame pattern. Figure 24 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.

  • Page 24: Cleaning And Maintenance

    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. WARNING ICON G 001 Turn off and unplug heater and let cool before servicing. Only a qualified service person should service and repair heater.
  • Page 25 Repeat ignition operation 4. Fully open manual shut- off valve 5. Hand tighten until snug, then tighten 1/4 turn more 6. A) Contact local propane gas company B) Clean ODS/pilot (see Cleaning and Mainte- nance, page 24) or replace ODS/pilot assembly 7.
  • Page 26 If found, clean burner (see Cleaning and Mainte- nance, page 24) 2. Replace gas regulator 1. Problem will stop after a few hours of operation 1. Turn control knob to LO position and let warm up for a minute 2.
  • Page 27 • 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.

  • Page 28: Technical Service

    You may feel your gas pressure is too low or gas quality is bad. If so, contact your local propane gas supplier. 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 International.

  • Page 29: Replacement Parts

    Parts Under Warranty Contact authorized dealers of this product. If they can’t supply original replacement part(s), either contact your nearest Parts Central (see below) or call DESA International’s Technical Service Department at 1-800-323-5190. When calling DESA International, have ready •...

  • Page 30: Accessories

    Purchase these heater accessories from your local dealer. If they can not supply these accessories, either contact your nearest Parts Central (see page 29) or call DESA International’s Parts Department at 1-800-972-7879 for information. You can also write to the address listed on the back page of this manual.

  • Page 31: Illustrated Parts List

    ILLUSTRATED PARTS LIST Manual Control 18,000 BTU/Hr Non- Thermostat Model (Parts list on page 33) 12-1 12-2 12 ODS/Pilot Assembly (Parts list on page 33) 099573...
  • Page 32 99573...

  • Page 33: Parts List

    PARTS LIST 18,000 BTU/Hr Non-Thermostat 098304-01 098742-03 — 098197-01 098342-01 098533-01AA 098260-01 098532-01AA M11084-26 098352-01BR 098271-02 098249-01 098245-03 12-1 098514-01 12-2 098515-01 099120-02 098517-01 098251-01 098250-01 098867-06 099553-01 098519-01 098298-03 — — — 098265-01 — — 098246-01 098529-01 097159-01 098508-01 M11084-26 M11084-38 099066-01...
  • Page 34 NOTES 099573...
  • Page 35 NOTES 099573...

  • Page 36: Warranty Information

    EVER 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.

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