Desa WMP20, GP30 GN30T Inspecting Heater, Pilot Flame Pattern, Thermostat Control Operation

Page 15

OPERATING HEATER (THERMOSTAT CONTROLLED MODELS)

Lighting Instructions (Cont.)

Thermostat Control Operation

Manual Lighting Procedure

INSPECTING HEATER

Pilot Flame Pattern

15

OPERATING HEATER

Continued

CAUTION: Do not try to adjust heating levels by using the equipment shutoff valve.

Ignitor Button

Control Knob

Note: The thermostat sensing bulb measures the temperature of air near the heater cabinet. This may not always agree with room temperature (depending on housing construction, instal- lation location, room size, open air temperatures, etc.). Fre- quent use of your heater will let you determine your own comfort levels.

PILOT

LO

 

FFO

 

HI

 

IGNITOR

Figure 21 - Control Knob In The OFF Position

Thermocouple

Ignitor Electrode

Pilot Burner

Figure 22 - Pilot (actual pilot may vary)

TO TURN OFF GAS TO APPLIANCE

Shutting Off Heater

1.Turn control knob clockwise to the OFF position.

2.Turn off all electric power to the appliance if service is to be performed.

MANUAL LIGHTING PROCEDURE

1.Remove front panel (see Figure 7, page 8).

2.Follow steps 1 through 5 under Lighting Instructions, page 14.

3.With control knob pressed in, strike match. Hold match to pilot until pilot lights.

4.Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds, release control knob. Now follow step 8, under Lighting Instructions, page 14.

5.Replace front panel.

INSPECTING HEATER

Check pilot flame pattern and burner flame pattern often.

PILOT FLAME PATTERN

Figure 23 shows a correct pilot flame pattern. Figure 24 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.

If pilot flame pattern is incorrect, as shown in Figure 24

turn heater off (see To Turn Off Gas to Appliance, page 14 or 15)

see Troubleshooting, pages 17 through 19

Note: The pilot flame on natural gas units will have a slight curve, but flame should be blue and have no yellow or orange color.

Shutting Off Burner Only (pilot stays lit)

Turn control knob clockwise to the PILOT position.

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. If so, the burner will shut off. The burner will cycle back on when room temperature drops below the set temperature. The control knob can be set to any heat level between HI and LO. Selecting the HI setting will cause the burner to remain fully on without modulating down in most cases.

Thermocouple

Thermocouple

Yellow Flame

 

Blue Flame

 

 

Pilot Burner

Pilot

 

Burner

 

 

Figure 23 - Correct Pilot

Figure 24 - Incorrect Pilot Flame

Flame Pattern

Pattern

For more information, visit www.desatech.com

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Contents What to do if YOU Smell GAS GWN20T, GWP20T GWN30T, GWP30TSafety Information Table of ContentsUnpacking Safety Information Product IdentificationProduct Features Local CodesConfined and Unconfined Space AIR for Combustion and VentilationProviding Adequate Ventilation Unusually Tight ConstructionDetermining if You Have a Confined or Unconfined Space Determining FRESH-AIR Flow for Heater LocationVentilation AIR Ventilation Air From Inside BuildingVentilation Air From Outdoors Locating Heater InstallationInstallation Items Check GAS TypeRemoving Front Panel Of Heater Installing Heater to WallAttaching Thermostat Sensing Bulb Mounting BracketMarking Screw Locations Attaching Mounting Bracket To WallPlacing Heater On Mounting Bracket Mounting Base Feet to Heater Installing Bottom Mounting ScrewsMounting Base Feet to Floor Where required by local code Mounting Heater to Floor with Optional Floor KITTypical Inlet Pipe Diameters Connecting to GAS SupplyPressure Testing Gas Supply Piping System Pressure Testing Heater Gas ConnectionsChecking GAS Connections Manual Control Models For Your Safety Read Before Lighting Operating HeaterLighting Instructions Shutting Off Burner Only pilot stays lit Manual Lighting ProcedureTo Turn OFF GAS to Appliance Shutting Off HeaterInspecting Heater Pilot Flame PatternThermostat Control Operation Cabinet Cleaning MaintenanceCleaning Burner Pilot AIR Inlet Burner Flame PatternObserved Problem Possible Cause TroubleshootingObserved Problem Possible Cause Remedy Gas leak. See Warning statement at Illustrated Parts Breakdown WMN20 WMP20 Description QTY Parts ListGWN30T, GWP30T GGN30T, GP30T GWN20T, GWP20T, GWN30T, GWP30T Technical Service SpecificationsReplacement Parts Service HintsOwners Registration Form Postage Required FAN Kits GA3250T AccessoriesParts Centrals Equipment Shutoff Valve GA5010Warranty Information