Desa ROPANE CONSTRUCTION HEATERS Owner's Manual page 11

Air Sensing Switch
(80,000 BTU/Hr Model)
1. Remove upper shell (see
page 10).
2. Clean air sensing switch
paddle. Use soft cloth
moistened with kerosene
or solvent. IMPORTANT:
Do not scrub. Use gentle
cleaning action. Do not
bend paddle or paddle
arm.
3. Blot paddle dry with a soft
cloth.
4. Replace fan guard and
upper shell.
Ignitor
(150,000 BTU/Hr Model)
1. Make sure gap between
ignitor electrode and
burner nozzle is .13⁄.15".
Access ignitor electrode
from inside combustion
chamber. No other main-
tenance is needed for
ignitor.
Spark Plug
(80,000 BTU/Hr Model)
1. Remove upper shell (see
page 10).
2. Remove fan (see page 10).
3. Remove spark plug cable
from spark plug.
4. Place 11/16" socket onto
spark plug mounting nut.
Spark plug mounting nut
is located on spark plug
threads inside combustion
chamber (see Figures 12
and 14).
5. Loosen and remove spark
plug with 13/16" spark
plug socket. Be careful not
to strike air sensing switch
paddle.
6. Clean and regap spark
plug electrodes. Regap
electrodes to .06/.08 inch.
Continued
099162
Figure 11 - Air Sensing Switch Location, 80,000 BTU/Hr Model Only
150 Model
Spark Plug
Mounting
Nut
Figure 12 - Spark Plug and Spark Plug Mounting Nut Location
Spark Plug Nut Location
on Combustion Chamber
Figure 13 - Spark Plug Gap
LP-PFA/P 019A
Spark Plug
Cable
Spark Plug
Cable
LP-PFA/P 021
Gap
Air Sensing
Switch
Paddle
Paddle
Arm
Combustion
Chamber
Bend Here
To Adjust
Gap
11