Power Soak 37179 PS-275 Service Manual - Manual (Page 33)

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extending out of conduit fitting). The device should read less than one ohm when
closed. Check each wire for a “short” between the wire and the system ground
connection. A “short to ground” from either side of the Thermo-disc indicates that the
Thermo-disc is defective. These conditions will keep the UPM from operating correctly.
On some motors, the Thermo-disc is built in to the motor, which is not replaceable. On
other motor styles, it is located in the wiring box of the Motor, which is replaceable.
When replacing the Thermo-disc, it is imperative to put heat sink compound on the side
of the Thermo-disc that will be against the motor to ensure good heat transfer.
(NOTE: The heating element thermo-disc is wired in series with the motor thermo-disc,
see the schematic for wiring information.)
7.3 Heating Element
Most Power Soak pot washing machines are built with the heating element option. The
heating element is located under the removable plate in the slanted surface of the back
wall of the wash tank. The heating element will only operate if the wash tank is full and
the pump motor is running. The element will cycle on and off as necessary to keep the
wash solution at the preset operating temperature. The operating temperature is
adjustable with a setting in the UPM. The temperature setting is described in the UPM
programming manual number 37193.
Heating elements have been made in a variety of styles that have different appearance
but all work the same. Each of the different styles use the same mounting flange and
are interchangeable for the same performance in heating the fluid in the wash tank.
Conduit fitting from
motor connection
Unplug the
connectors to
check continuity
Check continuity
across the motor
thermo-disc wires
Yellow wires from
wiring harness