Desa A User Manual

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BLUE-FLAME VENT-FREE
NATURAL 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
“A” Model Heaters
Save this manual for future reference.
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.
®
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Summary of Contents

Page 1 - NATURAL GAS HEATER

BLUE-FLAME VENT-FREENATURAL GAS HEATEROWNER’S OPERATION AND INSTALLATION MANUALHeater Sizes: 18,000 BTU/Hr Non-Thermostat,18,000 BTU/Hr Thermostat, an

Page 2 - INFORMATION

10099569Figure 5 - Attaching Thermostat Sensing BulbClampThermostatSensing BulbFor convenience and efficiency, install heater• where there is easy acc

Page 3

11099569INSTALLING HEATER TO WALLMounting BracketThe mounting bracket is located on back panel of heater. It has been taped there forshipping. Remove

Page 4

12099569Marking Screw Locations1. Tape mounting bracket to wall where heater will be located. Make sure mount-ing bracket is level.28,000 BTU/Hr Model

Page 5 - VENTILATION

130995694. 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!F

Page 6

14099569CONNECTINGTO GASSUPPLYNOTICEA qualified service person must connect heater to gas supply.Follow all local codes.Typical Pipe Diameters18,000 B

Page 7

15099569IMPORTANT: Hold pressure regulator with wrench when connecting it to gas pipingand/or fittings.PressureRegulatorTee JointReducerBushing to1/8

Page 8

16099569ONPOSITIONOFFPOSITION4. Check all joints of gas supply piping system. Apply mixture of liquid soap andwater to gas joints. Bubbles forming sho

Page 9

17099569OPERATINGHEATERThermostat ModelsFOR YOUR SAFETY READ BEFORE LIGHTINGA. This appliance has a pilot which must be lighted by hand. When lighting

Page 10 - CAUTION

180995694. Wait five (5) minutes to clear out any gas. Then smell for gas, includingnear the floor. If you smell gas, STOP! Follow “B” in the safety i

Page 11 - INSTALLING

19099569TO TURN OFF GAS TO APPLIANCEOPERATINGHEATERThermostat ModelsContinuedShutting Off Heater1. Turn control knob clockwise Clockwise to the OFF po

Page 12 - WARNING

2099569CONTENTSSECTION PAGESAFETYINFORMATIONWARNING ICON G 001 WARNINGSIMPORTANT: Read this owner’s manual carefully and completely beforetrying to as

Page 13

20099569OPERATINGHEATERNon-ThermostatModelFOR YOUR SAFETY READ BEFORE LIGHTINGA. This appliance has a pilot which must be lighted by hand. When lighti

Page 14 - WARNING ICON G 001

210995694. Wait five (5) minutes to clear out any gas. Then smell for gas, includingnear the floor. If you smell gas, STOP! Follow “B” in the safety i

Page 15

22099569Shutting Off Heater1. Turn control knob clockwise Clockwise to the PILOT position.2. Press in control knob and turn clockwise Clockwise to the

Page 16 - Continued

230995691/2 GLASS HEIGHTINCORRECT FLAME PATTERNAT HIGH POSITIONIf pilot flame pattern is incorrect, as shown in Figure 21• turn heater off (see To Tur

Page 17

24099569CLEANINGANDMAINTENANCEODS/PILOT AND BURNER• Use a vacuum cleaner, pressurized air, or small, soft bristled brush to clean.CABINETAir Passagewa

Page 18 - C-clockwise

25099569REMEDY1. Turn on gas supply oropen manual shutoffvalve2. Turn control knob toPILOT position3. Press in control knobwhile in PILOTposition4. Co

Page 19 - Clockwise

26099569TROUBLE-SHOOTINGContinuedOBSERVEDPROBLEMBurner does not lightafter ODS/pilot is litDelayed ignition ofburnerBurner backfiringduring combustion

Page 20

27099569TROUBLE-SHOOTINGContinuedWARNING ICON G 001 WARNINGIf you smell gas• Shut off gas supply.• Do not try to light any appliance.• Do not touch an

Page 21

28099569TECHNICALSERVICEYou may have further questions about installation, operation, or troubleshooting.If so, contact DESA International’s Technical

Page 22 - Non-Thermostat

29099569REPLACEMENTPARTSNote: Use only original replacement parts. This will protect your warranty cover-age for parts replaced under warranty.Parts U

Page 23 - INSPECTING

3099569SAFETYINFORMATIONContinuedWARNING ICON G 001 WARNINGS ContinuedWARNING: Any change to this heater or its controls can be dangerous.1. Use only

Page 24

30099569ACCESSORIESPurchase these heater accessories from your local dealer. If they can not supplythese accessories, either contact your nearest Part

Page 25 - SHOOTING

31099569ILLUSTRATEDPARTS LISTManual Control18,000 BTU/Hr Non-Thermostat Model(Parts list on page 33)12 ODS/Pilot Assembly(Parts list on page 33)262434

Page 26

320995691234567891010111213141516171920212223242526272830313218NOTE: Thermostat Gas ValveShown. See page 31 forManual Control Valve.

Page 27

33099569PARTS LISTThis list contains replaceable parts used in your heater. When ordering parts, followthe instructions listed under Replacement Parts

Page 29 - CENTRALS

35099569NOTES

Page 30 - ACCESSORIES

LIMITED WARRANTYBLUE-FLAME VENT-FREE NATURAL GAS HEATERSDESA International warrants this product to be free from defects in materials and components f

Page 31 - PARTS LIST

4099569PRODUCTIDENTIFICATIONLOCAL CODESInstall and use heater with care. Follow all local codes. In the absence of localcodes, use the latest edition

Page 32 - Manual Control Valve

5099569FRESH AIRFORCOMBUSTIONANDVENTILATIONWARNING ICON G 001 WARNINGThis heater must have fresh air for proper operation. If not, poorfuel combustion

Page 33

6099569FRESH AIRFORCOMBUSTIONANDVENTILATIONContinuedWARNING ICON G 001 WARNINGYou must provide additional ventilation air in a confined space.DETERMIN

Page 34

7099569FRESH AIRFORCOMBUSTIONANDVENTILATIONContinuedVENTILATION AIRVentilation Air From Inside BuildingThis fresh air would come from an adjoining unc

Page 35

8099569FRESH AIRFORCOMBUSTIONANDVENTILATIONContinuedVENTILATION AIR (Continued)Ventilation Air From OutdoorsProvide extra fresh air by using ventilati

Page 36 - WARRANTY INFORMATION

9099569INSTALLINGTO WALLNOTICEA qualified service person must install heater. Follow all local codes.CHECK GAS TYPEUse only natural gas. If your gas s

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