Welch Vacuum 8925 Direct Drive Rotary Vane Pump - Manual (Page 15)

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4.02 Changing the Voltage Setting on 8907, 8912 and 8917 “A”- Models only
The pumps are set for low voltage (LV) 115 volts 60 Hz.
They may also be set for high voltage (HV) 230 volts 60 Hz.
To change the voltage setting, see the wiring diagram below.
4.03 Changing the Voltage Setting on 8907, 8912 and 8917 “C”- Models with Global Motor Option
The voltage setting is permanently displayed in a small window on the pump motor electrical box.
The window is located next to the power cord connection and displays either
LV for 100-120V or HV for 200-230V.
To change VOLTAGE setting:
1. Disconnect the electrical power cord.
2. Open the motor electrical box by removing the
four screws and removing the cover.
3. Locate the voltage selection switch next
to the external electrical power cord connector.
4. Remove the voltage marker (61-6071).
The switch is very tightly installed.
To remove, place index and middle
finger along the top edge and pull backwards.
5. Change the voltage selection switch (61-1303)
to the opposite position.
6. Rotate the voltage marker, 180° and insert
into previous location. The voltage marker
is keyed to the switch setting so that it
can only display the correct setting. The
selected voltage setting can been seen through
the window in the electrical box.
7. Replace the electrical box cover
before reconnecting the power cord.
8. Attach solenoid valve leads. One lead of the
solenoid valve to orange motor wire, and one lead to yellow motor wire.
CAUTION
Make certain that the voltage setting (LV or HV) is in the
correct range for your power before plugging in.