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OPERATING HEATER
Continued
Ignitor Electrode
Thermocouple
Figure 19 - Pilot
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise
OFF position.
Shutting Off Burners Only (pilot stays lit)
Turn control knob clockwise
LOT position.
THERMOSTAT CONTROL
OPERATION
The thermostat control knob can be set to any
comfort level between HI and LO. The ther-
mostat will gradually modulate the heat out-
put and flame height from higher to lower set-
tings, 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 burners to remain fully on,
without modulating down in most cases.
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 5 under Lighting In-
structions, page 14.
2. Depress control knob and light pilot with
match.
3. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8
Lighting Instructions, page 14
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 20 shows a correct pilot flame pattern. Figure
21 shows an incorrect pilot flame pattern. The incor-
113066-01A
rect 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 Fig-
Pilot Burner
ure 21
• turn heater off (see To Turn Off Gas to Appliance)
• see Troubleshooting, page 18
Note: The correct pilot flame on natural gas units
will have a slight curve, but flame should be blue
an have no yellow or orange color.
Thermocouple
to the
Figure 20 - Correct Pilot Flame Pattern
to the PI-
Thermocouple
Figure 21 - Incorrect Pilot Flame Pattern
BURNER FLAME PATTERN
Figure 22 shows a correct burner flame pattern.
Figure 23 shows an incorrect burner flame pat-
tern. If burner flame pattern is incorrect,
• turn heater off (see To Turn Off Gas to Appliance)
• see Troubleshooting, pages 18 through 21
Approx.
3-6"
Above
Top of
Logs
Figure 22 - Correct Flame Pattern with
More
Than 8"
Above
Top of
Logs
Figure 23 - Incorrect Flame Pattern with
www.desatech.com
(Natural Gas Shown)
(Natural Gas Shown)
Control Knob Set to High Flame
Control Knob Set to High Flame
Pilot Burner
Pilot Burner
15
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