TM 10-3510-220-24
3-19.
WATER HEATER ELECTRIC CONTROL ASSEMBLY (CONT)
TEST (Cont)
6 .
Check power limit switch (1) as follows:
a.
Set power limit switch (1) to OFF.
b.
Use multimeter on high ohms scale and measure from receptacle (4) to input terminals of the motor
contractor (7). Meter should indicate open circuit.
c.
Set power limit switch (1) to ON.
d.
Use multimeter on low ohms scale and repeat measurements in step b. above. Meter should indicate
contiguity for points connected by same color of wire.
e.
Replace power limb switch (1) if defective (DISASSEMBLY, steps 2 and 3).
7 .
Check motor contactor (7) as follows:
a.
Use multimeter on high ohms scale and measure from the three input terminals to the three corresponding
output terminals of motor contractor (7). Meter should indicate open circuit.
b.
Use multimeter on low ohms scale,
push up motor contractor solenoid,
and repeat measurements instep a.
above. Meter should indicate conti-
nuity.
c.
Replace motor contractor (7) if
defective (DISASSEMBLY, step
5).
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Change 3