Desa Tech S26PTA - Manual (Page 15)

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Figure 20 - Pilot
Thermocouple
Pilot Burner
Ignitor Electrode
OPERATING HEATER
Continued
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 21 shows a correct pilot flame pattern. Figure
22 shows an incorrect pilot flame pattern. The incor-
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise to the
OFF position.
Shutting Off Burners Only (pilot stays lit)
Turn control knob clockwise to the PI-
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
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-
ure 22
• turn heater off (see To Turn Off Gas to Appliance)
• see Troubleshooting, pages 18 through 21
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.
Figure 21 - Correct Pilot Flame Pattern
(Natural Gas Shown)
Figure 22 - Incorrect Pilot Flame Pattern
(Natural Gas Shown)
Thermocouple Pilot Burner
Thermocouple Pilot Burner
Figure 23 - Correct Flame Pattern with
Control Knob Set to High Flame
Figure 24 - Incorrect Flame Pattern with
Control Knob Set to High Flame
Approx.
3-6"
Above
Top of
Logs
More
Than 8"
Above
Top of
Logs
BURNER FLAME PATTERN
Figure 23 shows a correct burner flame pattern.
Figure 24 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