14
OPERATING HEATER
To Turn Off Gas To Appliance
Thermostat Control
Manual Lighting Procedure
INSPECTING HEATER
Pilot Flame Pattern
OPERATING HEATER
Continued
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.
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.
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.
INSPECTING HEATER
Check pilot flame pattern and burner flame pattern often.
PILOT FLAME PATTERN
Figure 21 shows a correct pilot flame pattern. Figure 22 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 22
•turn heater off (see To Turn Off Gas to Appliance)
•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.
Thermocouple
Blue Flame
Pilot Burner
Figure 21 - Correct Pilot Flame Pattern
Thermocouple | Yellow Flame |
Pilot Burner
MANUAL LIGHTING
PROCEDURE
Figure 22 - Incorrect Pilot Flame Pattern
1.Remove front panel (see Figure 7, page 8).
2.Follow steps 1 through 5 under Lighting Instructions, page 13.
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 13.
5.Replace front panel.
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