Desa WMP20A User Manual

MODELSGWN20TA, GWP20TA, GWN30TA, GWP30TA, WMN20A, WMP20AUNVENTED (VENT-FREE) BLUE FLAME GAS HEATERSAFETY INFORMATION AND INSTALLATION MANUALFor more i

www.desatech.com119344-01B10INSTALLATIONContinued30,000 Btu/Hr Models20,000 Btu/Hr ModelsFigure 8 - Mounting Bracket ClearancesAttaching Mounting Brac

www.desatech.com119344-01B 11Figure 12 - Installing Bottom Mounting ScrewsSide ViewFront ViewWallSpacerHeaterInstalling Bottom Mounting Screws1. Loca

www.desatech.com119344-01B12CONNECTING TO GAS SUPPLY WARNING: This appliance requires a 3/8" NPT (National Pipe Thread) inlet connection t

www.desatech.com119344-01B 13* A CSA design-certied equipment shutoff valve with 1/8" NPT tap is an acceptable al-ternative to test gauge co

www.desatech.com119344-01B143. Check all joints from gas meter for natural gas (see Figure 17) or propane/LP supply tank for propane/LP gas, to

www.desatech.com119344-01B 156. Thermostat Models: Turn control knob counterclockwise to the PILOT position. Press in control knob for ve (

www.desatech.com119344-01B16OPERATING HEATERContinuedTHERMOSTAT CONTROL OPERATIONThe thermostatic control used on these models differs from st

www.desatech.com119344-01B 17BURNER FLAME PATTERN WARNING: If yellow tipping occurs, your heater could pro-duce increased levels of carbon monoxide.NO

www.desatech.com119344-01B18CLEANING AND MAINTENANCE WARNING: Turn off heater and let cool before cleaning. CAUTION: You must keep control are

www.desatech.com119344-01B 19TROUBLESHOOTING WARNING: Turn off and unplug heater and let cool before servicing. Only a qualied service person should

www.desatech.com119344-01B2SAFETY INFORMATIONWARNING: Improper in-stallation, adjustment, al-teration, service or mainte-nance can cause injury or

www.desatech.com119344-01B20OBSERVED PROBLEMODS/pilot lights but flame goes out when control knob is releasedBurner does not light after OD

www.desatech.com119344-01B 21TROUBLESHOOTINGContinuedOBSERVED PROBLEMYellow ame during burner combustionSlight smoke or odor during initial op

www.desatech.com119344-01B22 WARNING: If you smell gas• Shut off gas supply.• Do not try to light any appliance.• Do not touch any electrical switc

www.desatech.com119344-01B 23SPECIFICATIONSWMN20A, GWN20TA• Btu (Variable): 10,000/20,000 Btu/Hr• Type Gas: Natural Only• Ignition: Piezo• Pressur

www.desatech.com119344-01B244*204**1718**19**23568169101112131418* *Manual Control Models Only**Thermostat Models Only19*7121*22*159ILLUSTRATED PARTS

www.desatech.com119344-01B 25PARTS LISTThis list contains replaceable parts used in your heater. When ordering parts, follow the instructi

www.desatech.com119344-01B26ACCESSORIESPurchase these heater accessories from your local dealer. If they can not supply these acces-sories, either con

www.desatech.com119344-01B 27Tool & Equipment Co.5 Manila AveHamden, CT 06514-03221-800-397-7553203-248-7553Portable Heater Parts342 N. County Rd.

Always specify model and serial numbers when communicating with the factory.We reserve the right to amend these specications at any time without noti

www.desatech.com119344-01B 3Natural and Propane/LP Gas: Natural and pro-pane/LP gases are fuel gases. Fuel gases are odorless. An odor-making agent is

www.desatech.com119344-01B412. Operating heater above elevations of 4,500 feet could cause pilot outage.13. To prevent performance problems, do no

www.desatech.com119344-01B 5AIR FOR COMBUSTION AND VENTILATION WARNING: This heater shall not be installed in a conned space or unusually tig

www.desatech.com119344-01B6AIR FOR COMBUSTION AND VENTILATIONContinued DETERMINING FRESH-AIR FLOW FOR HEATER LOCATIONDetermining if You Have a Conned

www.desatech.com119344-01B 7Figure 3 - Ventilation Air from OutdoorsVENTILATION AIRVentilation Air From Inside BuildingThis fresh air would come from

www.desatech.com119344-01B8INSTALLATION ITEMSBefore installing heater, make sure you have the items listed below.• for propane/LP gas, external r

www.desatech.com119344-01B 9INSTALLATIONContinuedTHERMOSTAT SENSING BULB (Thermostat Models Only)The thermostat sensing bulb has been placed below the