Inspecting Burners - Desa HDL18N Owner's Operation And Installation Manual

5. Press in control knob and turn counter-
clockwise
(see Figure 21). The ignitor will spark
once. Keep control knob pressed in for 5
seconds. If control knob does not pop up
when released, contact a qualified service
person or gas supplier for repairs.
Note: You may be running this heater for
the first time after hooking up to gas sup-
ply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.
6. Turn control knob clockwise
OFF position. Press in control knob and
turn counterclockwise
position. This will light pilot. Pilot is at-
tached to rear of burner. If needed, repeat
this process until pilot lights.
Note: If pilot does not stay lit, contact a
qualified service person or gas supplier
for repairs. Until repairs are made, light
pilot with match. To light pilot with match,
see Manual Lighting Procedure.
7. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob.
Note: If pilot goes out, repeat steps 3
through 7.
Control Knob
Figure 21 - Control Knob and Ignitor
Button Location
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 22 shows a correct pilot flame pattern.
Figure 23 shows an incorrect pilot flame pat-
tern. Incorrect pilot flame is not touching ther-
mocouple. This will cause the thermocouple
to cool. When thermocouple cools, heater
will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 23
• turn heater off (see To Turn Off Gas to
Appliance, above
• see Troubleshooting, page 20
18
OPERATION
Continued
to the PILOT position
to PILOT
HI
PILOT
OFF
LO

INSPECTING bURNERS

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• If control knob does not pop out when
released, contact a qualified service
person or gas supplier for repairs.
8. Slightly press and turn control knob coun-
terclockwise
level. The burner should light. Set control
knob to HI or LO.
WARNING: Do not operate
heater between PILOT and HIGH
positions.
to
9. To leave pilot lit and shut off burners only,
turn control knob clockwise
PILOT position.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
TO TURN OFF GAS
TO APPLIANCE
1. Turn control knob clockwise
position.
2. Close equipment shutoff valve (see Figure
15, page 15).
MANUAL LIGHTING
1. Follow steps 1 through 5 under Lighting
Instructions beginning on page 17.
2. Press 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
under Lighting Instructions, above.
Thermocouple
Figure 22 - Correct Pilot Flame Pattern
Thermocouple
Figure 23 - Incorrect Pilot Flame Pattern
to desired heating
PROCEDURE
Pilot Burner
Pilot Burner
to the
to OFF
122493-01C