Desa WMN20A, GWP20TA, GWP30TA Specifications, Service Hints, Replacement Parts, Technical Service

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Specifications

WMN20A, GWN20TA

• Btu (Variable): 10,000/20,000 Btu/Hr

• Type Gas: Natural Only

• Ignition: Piezo

• Pressure Regulator Setting: 3" W.C.

• Inlet Gas Pressure (in. of water): Maximum - 10.5", Minimum - 4"

GWN30TA

• Btu (Variable): 15,000/30,000 Btu/Hr

• Type Gas: Natural Only

• Ignition: Piezo

• Pressure Regulator Setting: 3" W.C.

• Inlet Gas Pressure (in. of water): Maximum - 10.5", Minimum - 4"

WMP20A, GWP20TA

• Btu (Variable): 10,000/20,000 Btu/Hr

• Type Gas: Propane/LP Only

• Ignition: Piezo

• Pressure Regulator Setting: 8" W.C.

• Inlet Gas Pressure (in. of water): Maximum - 14", Minimum - 11"

GWP30TA

• Btu (Variable): 15,000/30,000 Btu/Hr

• Type Gas: Propane/LP Only

• Ignition: Piezo

• Pressure Regulator Setting: 8" W.C.

• Inlet Gas Pressure (in. of water): Maximum - 14", Minimum - 11"

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 natural or propane/LP gas supplier.

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 Ser- vice 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), either contact your nearest Parts Central (see page 27) or 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

Technical Service

You may have further questions about instal- lation, 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 DESAHeating Products’ tech- nical 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 Heat- ing Products.

119344-01B

www.desatech.com

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Contents Models GWN20TA, GWP20TA, GWN30TA, GWP30TA, WMN20a, WMP20a What to do if YOU Smell GASSafety Information Table of ContentsSafety Information Unpacking Safety InformationProduct Features Local CodesConfined and Unconfined Space Air For Combustion VentilationProviding Adequate Ventilation Unusually Tight ConstructionDetermining if You Have a Confined or Unconfined Space AIR for Combustion VentilationDetermining FRESH-AIR Flow for Heater Location Ventilation Air From Inside Building InstallationVentilation AIR Check GAS TypeThis heater is designed to be mounted on a wall InstallationInstallation Items Locating HeaterInstalling Heater to Wall Attaching To Wall Anchor Method 30,000 Btu/Hr Models20,000 Btu/Hr Models Attaching To Wall Stud MethodMounting Base Feet to Heater Installing Bottom Mounting ScrewsMounting heater to floor With optional floor kit Heater WallTypical Inlet Pipe Diameters Connecting to GAS SupplyTest Pressures Equal To or Less Than 1/2 Psig 3.5 kPa Checking GAS ConnectionsCorrect all leaks at once Pressure Testing Heater Gas ConnectionsDo not try to light any appliance For Your Safety Read Before LightingOperating Heater Lighting InstructionsThermostat Control Operation Manual Lighting ProcedureOperating Heater To Turn OFF GAS To ApplianceBurner Flame Pattern Inspecting HeaterPilot Flame Pattern Cabinet Cleaning MaintenanceODS/PILOT and Burner Burner Pilot Air InletObserved Problem Possible Cause Remedy TroubleshootingTroubleshooting Burner orifice Observe minimum installaSlight smoke or odor during BlockedStatement above Gas leak. See WarningTechnical Service SpecificationsService Hints Replacement PartsModels WMN20A, WMP20A, GWN20TA, GWP20TA, GWN30TA and GWP30TA Illustrated Parts BreakdownNJF 8C Parts ListElectronic ignitor Kit GA435 Not Shown AccessoriesEquipment Shutoff Valve GA5010 Base Kit GA4550Parts Centrals Industrial Drive P.O. Box 119344-01 Rev. B Warranty InformationKeep this Warranty Model Serial No Date of Purchase
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