Desa B350D Service Manual page 19

H I G H P R E S S U R E P O R T A B L E F O R C E D A I R H E A T E R S E R V I C E M A N U A L
Standard Flame Control
Part Number M50671-01
1. Unplug heater.
2. Remove upper shell of heater.
3. Check flame control with HA1170 tester
or use the following procedure.
A. Disconnect blue and white flame con-
trol wires from blue and white photo-
cell wires. These wires are connected
by small wire nuts near photocell.
B. Connect blue flame control wire to
white flame control wire. Use wire nut
to make connection. Make sure wires
are clear of fan.
C. Replace upper shell on heater.
D. Connect heater to electrical supply.
E. If reset button on flame control pops
out and heater shuts off, the flame
control is defective and must be re-
placed. If heater continues to run and
reset button does not pop out, the
problem is not in the flame control.
B. Defective or dirty photocell
1. Unplug heater.
2. Remove upper shell of heater.
3. Remove photocell from photocell bracket
attached to burner head.
4. If lens is dirty, wipe off with clean, soft
cloth.
Figure 26 - Cleaning Lens of Photocell
5. Replace photocell.
6. Replace upper shell on heater.
7. Connect heater to electrical supply. If prob-
lem remains, continue with steps below.
8. Unplug heater.
9. Remove upper shell of heater.
10. Remove photocell from photocell bracket
attached to burner head.
11. Check photocell with HA1170 tester or
use the following procedure.
A. Disconnect blue and white photocell
wires from blue and white flame con-
trol wires. These wires are connected
by small wire nuts near photocell.
B. Set ohmmeter on the RX1K position.
C. Connect the ohmmeter test leads to
the photocell wires.
D. Hold photocell lens up to a light source
(60 watt light bulb or direct sunlight).
Make sure lens is facing light source.
The resistance indicated on the ohm-
meter should be less than 500 ohms.
E. Block off light source completely by
holding the opening of photocell against
a smooth, flat surface such as the fuel
tank. Within 10 seconds the resistance
indicated on the ohmmeter should be
greater than 250,000 ohms.
F. Replace photocell if any of these con-
ditions are not met during testing.
C. Loose wire nut connection
Check all electrical connections for tightness.
Continued
19