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104464-01E
For more information, visit www.desatech.com
For more information, visit www.desatech.com
14
INSPECTING BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern. Figure 25 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 25
• turn heater off (see To Turn Off Gas to Appliance, column 1)
• see Troubleshooting, pages 16 through 18
Figure 24 - Correct Pilot Flame
Pattern
Figure 25 - Incorrect Pilot
Flame Pattern
Thermocouple
Pilot Burner
Pilot Burner
Thermocouple
1. Follow steps 1 through 5 under Lighting Instructions, page 13.
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 in Lighting Instructions, column 1.
THERMOSTAT CONTROL
OPERATION
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
OPERATING HEATER
Continued
TO TURN OFF GAS
TO APPLIANCE
CAUTION: Do not try to adjust heating levels by
using the equipment shutoff valve.
Shutting Off Heater
Turn control knob clockwise
Clockwise
to the OFF position.
Shutting Off Burners Only (pilot stays lit)
Turn control knob clockwise
Clockwise
to the PILOT position.
7. Keep control knob pressed in for 30 seconds after lighting
pilot. After 30 seconds, release control knob.
• If control knob does not pop out when released, contact a
qualified service person or gas supplier for repairs.
Note:
If pilot goes out, repeat steps 3 through 7. This heater
has a safety interlock system. Wait one (1) minute for sys-
tem to reset before lighting pilot again.
8. Turn control knob counterclockwise
C-clockwise
to desired heat-
ing level. The burners should light. Set control knob to any
heat level between HI and LO.
OPERATING HEATER
Lighting Instructions (Cont.)
To Turn Off Gas To Appliance
Thermostat Control Operation
Manual Lighting Procedure
INSPECTING BURNERS
Pilot Flame Pattern