Service Manual User Manual

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7.1 Pump Motor
The pump motor is bolted to a mounting plate that is attached to the pump housing.
The pump impeller is attached directly to the motor shaft. A rotary joint seal is used to
separate the water containment area from the front of the motor (see section 8.1 for
assembly instructions). The pump impeller and motor must rotate smoothly without
“dragging” anywhere in the rotation. The motor shaft can be turned by hand to verify
that the motor is rotating properly and that the pump is not jammed with debris. To
rotate the motor by hand, turn off the electrical power to the machine at the circuit
breaker before working on the pump motor. Remove the fan cover and turn the fan
blade by hand. If the fan blade will not rotate easily and/or smoothly there is a problem
with the motor or the pump. The motor will have to be removed from the pump housing
to determine the source of the problem (see section 8.1). Install the fan cover before
turning on the power to the machine.
7.2 Motor Thermo-disc
The Motor Thermo-disc is a protection device to keep the motor from being damaged by
excessive heat. If the temperature at the Thermo-disc reaches 180°F, the disc opens,
turning off power to the UPM. To check the operation, first shut off the circuit breaker in
the wall mounted enclosure that supplies electrical power to the control panel. Open
the control panel enclosure and locate the two wires extending out of the conduit fitting
that is connected to the motor. Unplug the connectors that are attached to the yellow
wires from the wiring harness (on the schematic these are shown as P9 and J10
connected to J9 and P10 for the Motor Thermo-disc). Use an Ohm meter to check the
resistance across the two wires that are attached to the motor thermo-disc (wires
The Pump Motor fan cover provides protection from the
moving fan blade. The power to the machine must be
turned off at the circuit breaker in the wall mounted
enclosure when working on the pump motor. Failure to
turn off the power will result in serious injury.
The Pump Motor is connected to high voltage electricity.
The power to the machine must be turned off at the circuit
breaker in the wall mounted enclosure when working on
the electrical connection for the pump motor. Failure to
turn off the power will result in serious injury and possibly
death.