Desa GMP16T, GMP26T, GMP20BT Inspecting Heater, Thermostat Control Operation, Pilot Flame Pattern

Page 17

OPERATING HEATER

Continued

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 1 and 5. Selecting setting 5 will cause the burner to remain fully on without modulating down in most cases.

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

Control
Knob GMP16T	GMP26T

Figure 23 - Burner Patterns for Infrared

Heaters Only

MANUAL LIGHTING

PROCEDURE

1.Remove front panel (see Figure 7, page 9).

2.Follow steps 1 through 5 under Lighting In- structions, page 16.

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

4.Keep control knob pressed in for 30 sec- onds after lighting pilot. After 30 seconds, release control knob. Now follow step 8, under Lighting Instructions, page 16.

5.Replace front panel.

INSPECTING HEATER

Check pilot flame pattern and burner flame pat- tern often.

PILOT FLAME PATTERN

Figure 24 shows a correct pilot flame pattern. Figure 25 shows an incorrect pilot flame pat- tern. The incorrect pilot flame is not touching the thermocouple. This will cause the thermo- couple to cool. When the thermocouple cools, the heater will shut down.

If pilot flame pattern is incorrect, as shown in Figure 25

•turn heater off (see To Turn Off Gas to Appli- ance, page 16)

•see Troubleshooting, page 20

Thermocouple

Blue Flame

Pilot Burner

Figure 24 - Correct Pilot Flame Pattern

Thermocouple

Yellow Flame

Pilot

Burner

Figure 25 - Incorrect Pilot Flame Pattern

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Contents What to do if YOU Smell GAS Table of Contents Safety Information Local Codes Safety Information Product IdentificationProviding Adequate Ventilation AIR for Combustion VentilationUnusually Tight Construction Confined and Unconfined SpaceDetermining if You Have a Confined or Unconfined Space Determining FRESH-AIR Flow for Heater LocationVentilation AIR InstallationCheck GAS Type Ventilation Air From Inside BuildingLocating Heater Installation ItemsInstalling Heater to Wall Placing Heater On Mounting Bracket 20,000 Btu/Hr ModelsAttaching To Wall Anchor Method Mounting Base Feet to Floor Where required by local code Installing Bottom Mounting ScrewsMounting Heater to Floor with Optional Floor KIT Mounting Base Feet to HeaterTypical Inlet Pipe Diameters Connecting to GAS SupplyChecking GAS Connections Pressure Testing GAS Supply Piping SystemTest Pressures In Excess Of 1/2 Psig 3.5 kPa Test Pressures Equal To or Less Than 1/2 Psig 3.5 kPaPressure Testing Heater GAS Connections For Your Safety Read Before LightingOperating Heater Manual Control Models Lighting InstructionsTo Turn OFF GAS To Appliance Manual Lighting ProcedureTo Select Heating Level for Infrared Heaters Thermostat Controlled Models Lighting Instructions Thermostat Control Operation Inspecting HeaterPilot Flame Pattern Control Knob GMP16TBurner Flame Pattern for Infrared Heaters Inpecting HeaterBurner Flame Pattern for Blue Flame Heaters ODS/PILOT and Burner Cleaning MaintenanceBurner Pilot AIR Inlet CabinetObserved Problem Possible Cause Remedy TroubleshootingPressed See Cleaning and Mainte Statement above Gas leak. See WarningGMP16 GMP26 GMP16T GMP26T SpecificationsGMP30BT GMP20BT Technical Service Service HintsService Publications Replacement Parts AccessoriesModels GMP16, GMP26, GMP16T, and GMP26T Illustrated Parts BreakdownParts AVAILABLE-NOT Shown Parts ListModels GMP16 and GMP26 Illustrated Parts Breakdown and Parts ListModels GMP16T and GMP26T ODS/Pilot Burner Assembly GMP16TModels GMP20BT and GMP30BT Parts Available not Shown Limited Warranty VENT-FREE Residential GAS Heaters Warranty InformationKeep this Warranty