MP-129 Installation
2–12
18-gauge industrial-grade wire is required for the low voltage wiring of the
pressure switch and solenoid valve.
Pump Motor Connection 1. Remove the cover plate from the junction box on the side of
the pump motor.
2. Pull the wires out and connect these wires in the
appropriate combinations as shown on the wiring diagram.
If the pump is wired for High Voltage, you must also replace the overload
heaters (see Figure 2–6 on page 2-13).
3. Replace the cover plate.
4. Route the brown, blue, and green/yellow wires from the
pump motor to motor start relay 2K and connect as shown
on wiring diagram 531181.
Pressure Switch 1. Connect the black wire from the “NC” terminal on tpressure
switch 1PS to the No. 9 terminal on motor start relay 2K.
2. Connect the white wire from the common wire nut in the
pressure switch box to the No. 3 terminal on the motor start
relay.
3. Connect a black wire from the “C” terminal on pressure
switch 1PS to the No. 12 terminal on terminal block 2TB in
sterilizer Control Box 2A.
4. Connect a white wire from the No. 2 terminal on terminal
block 1TB in sterilizer Power Box 1A to the common wire
nut inside the pressure switch box.
5. Adjust the pressure switch to 2 psi above atmospheric.
See "PRESSURE SWITCH ADJUSTMENT — M/C 4200" on page 4-6.
Solenoid Valves 1. Connect a black wire between solenoid valve 20SOL to
terminal No. 9 on motor start relay 2K.
2. Connect a white wire between solenoid valve 20SOL to
terminal No. 3 on the motor start relay 2K.
3. Connect a black wire from solenoid valve 6SOL to the “NO”
terminal on pressure switch 1PS.
4. Connect a white wire from solenoid valve 6SOL to the
common wire nut inside the pressure switch box.
NOTE
NOTE
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