Finish Thompson BE-55C - Manual (Page 32)

31
VACUUM/CIRCULATION PUMP SERVICING:
The Vacuum/circulation Pump is located on top of the Pump Reservoir. This centrifugal-type pump is
powered by a close-coupled TEFC electric motor rated at 1/2 hp, 3450 rpm, 230 volt, 3 phase, 60 hertz.
The motor is wired for clock-wise rotation when facing the motor’s fan.
CAUTION: Disconnect electrical power to the BE unit before working on
or repairing the Vacuum/circulation Pump and motor.
PUMP AND MOTOR REMOVAL AND RE-INSTALLATION:
1. Remove the front panel and top panel of the BE unit and set aside. Be careful—there are four
wires and a hose attached to the top panel. Set the top panel on its right side on top of a crate or
other support near the right front corner of the unit. If desired, remove the hose and wires from the
top panel, noting and tagging the proper wire locations for the On/off switch.
2. Open the electrical connection box on the side of the motor. Disconnect the BE unit’s wires #1T1,
1T2 and 1T3 from the motor’s wiring (they are connected with wire nuts). Loosen the plastic
conduit from the motor’s connection box (there is a plastic nut holding the conduit inside the
connection box) and pull the BE unit’s three wires and conduit away from the motor, noting and
tagging the proper wire locations for each lead (if the leads are not connected as they were, it is
possible that the motor will run in the wrong rotation and possibly spin the pumps impeller off its
shaft).
3. Tilt the pump’s motor to the side to expose the Circulation Pump and the Aspirator. Loosen the
hose clamps and remove the two hoses from the pump’s elbow and the Aspirator. Pull the
removed hoses out from the motor’s mounting plate. Also pull the third “open” hose from the
motor’s mounting plate. Lift the entire pump and motor assembly from the Pump Reservoir and set
it on a workbench for further disassembly.
4. After repairs are performed on the pump and
motor, the re-installation of the pump and motor
assembly are the same as the removal, but in the
opposite order.
IMPORTANT: Proper re-wiring of the motor (for
clockwise rotation when facing the motor fan) is
critical. Refer to the motor wiring diagram to the
right for details. Note: If motor rotates in a
counter-clockwise rotation, change any two of the
incoming power supply leads 1T1, 1T2, or 1T3 in
motor conduit box.
IMPORTANT: Proper reinstallation of the
hoses is critical:
 The hose that attaches to the pump’s elbow leads to the radiators.
 The hose that attaches to the Aspirator leads to port 2 of the Divert Valve.
 The “open” hose leads to the top of the Radiator.
Refer to the “Pump and motor disassembly and reassembly” sections that follow for details on further
servicing the pump and motor.
T1 T4
1T1
CLOCKWISE ROTATION
(FACING FAN)
PUMP MOTOR WIRING
T7 T2
1T2
T8 T3
1T3
T9 T5 T6