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24
102991
INSPECTING
BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 25 shows a correct pilot flame pattern. Figure 26 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.
Thermocouple
Pilot Burner
Figure 25 - Correct Pilot
Flame Pattern
Pilot Burner
Thermocouple
Figure 26 - Incorrect Pilot
Flame Pattern
If pilot flame pattern is incorrect, as shown in Figure 24
• turn heater off (see To Turn Off Gas to Appliance, page 21 [manually-con-
trolled models] or above [thermostat-controlled model])
• see Troubleshooting, pages 25 through 28
TO TURN OFF GAS TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise
Clockwise
to the OFF position.
Shutting Off Burners Only (pilot stays lit)
1. Turn control knob clockwise
Clockwise
to the PILOT position.
THERMOSTAT CONTROL OPERATION
(Thermostat-Controlled Models Only)
The thermostat control knob can be set to any comfort level between Hi and Lo. The
thermostat will gradually modulate the heat output and flame height from higher to
lower settings, or pilot, in order to maintain the comfort level you select. The ideal
comfort setting will vary by household depending upon the amount of space to be
heated, the output of the central heating system, etc.
Note:
Selecting the Hi setting with the control knob will cause the burner to remain
fully on, without modulating down in most cases.
MANUAL LIGHTING PROCEDURE
1. Follow steps 1 through 5 under Lighting Instructions, page 23.
2. Depress control knob and light pilot with match.
3. Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8, page 23.
OPERATING
HEATER
Thermostatically-
Controlled Model
Continued