TM 10-3510-220-24
3-21. WATER HEATER UV SCANNER AND FLAME SAFEGUARD ASSEMBLY
TEST (Cont)
4.
Open water heater control box lid (1) and check motor contractors (2). If contractors are tripped,
reset contractors and check for normal operation. If contractors continue to trip, test motor
contactor operation (step 5). If contractors are not tripped, go to step 6.
CAUTION
5.
Ensure that power is off before making continuity check. Damage to
test equipment could result.
Use a multimeter and check continuity from input terminals to output terminals on motor
contactor solenoid (3). Meter should indicate open circuit at each set of terminals. push up on
motor contactor solenoid. Meter should indicate continuity at each set of terminals.
6.
Loosen screw (4) and remove cover (5) on
flame safeguard control.
WARNING
Remove rings, bracelets, wrist-
watches, and neck chains before
working around or on the laundry
unit. Jewelry can catch on equip-
ment and cause injury, or may
short across an electrical circuit
and cause severe burns or
electrical shock.
WARNING
Use extreme caution when performing
the following test with power ON.
7.
Set load limit switches to ON and
check for 120 V ac at test points
(6) and (7) with multimeter. If
voltage is not normal, test load
limit switch (step 9). If voltage
is normal, go to next g step.
8.
Turn off load limit switch and
remove two screws (8) and flame
safeguard control circuit card (9).
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