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1. Place prime/pressure relief valve in the prime (open) position.
2. Unplug electrical cord.
3. Detach pressure control unit from the frame by unscrewing the eight screws
4. Unplug sensor lead from the pressure control unit.
5. Use a 7/8" wrench to unscrew the sensor from the pressure control unit.
6. Place teflon tape on the threads of the new sensor and screw it snuggly into the pressure control
unit.
7. Plug sensor lead into pressure control unit.
8. Complete the calibration procedures on pages 19.
9. Attach the pressure control unit frame.
1. Ensure that the machine is OFF and unplugged.
2. Detach the pressure control unit from the frame by unscrewing the eight screws.
3. Disconnect all wires, leads and hoses from the pressure control unit.
4. Remove the pressure control unit.
5. Reassemble in reverse order. See Fig. 7, page 20 for wiring diagram.
REPLACEMENT OF THERMAL CIRCUIT
BREAKER
1. Ensure that the machine is OFF and unplugged.
2. Detach the pressure control unit from the frame by unscrewing the eight screws.
3. Unplug potentiometer lead from the pressure control unit.
4. Use 1/16" allen wrench to loosen the set screw on the potentiometer knob and remove knob and
spacer.
5. Use 1/2" socket or wrench to remove the retaining nut from the potentiometer stem and remove
potentiometer from the frame.
6. Reassemble in reverse order.
1. Ensure that the machine is OFF and unplugged.
2. Detach the pressure control unit from the frame by unsrewing the eight screws.
3. Unplug the two black wires from the circuit breaker.
4. Unscrew the clear rubber boot and retaining nut on the circuit breaker stem and remove circuit
breaker from the frame. This can be done by hand.
5. Reassemble in reverse order. Note: the black wires are interchangeable.
REPLACEMENT OF POTENTIOMETER
REPLACEMENT OF PRESSURE
CONTROL UNIT (ELECTRICAL BOARD)
REPLACEMENT OF SENSOR
