TM 10-3510-209-24
3-20. WATER HEATER ELECTRIC CONTROL ASSEMBLY (CONT)
TEST (Cont)
7.
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
contactor (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
continuity for points connected by same color of wire.
e.
Replace power limit switch (1) if defective (DISASSEMBLY, steps 2 and 3).
8.
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 contactor (7). Meter should indicate open circuit.
b.
Use multimeter on low ohms scale, push
up motor contractor solenoid, and repeat
measurements in step a above. Meter
should indicate continuity.
c.
Replace motor contactor (7) if defective
(DISASSEMBLY, step 5).
3-90 Change 2
