Mitsubishi Outdoor Unit Split-Type Air Conditioner MUZ-AP50VG

Warning: Disconnect the connector between the compressor and the power module (IC700) before proceeding

Ohmmeter zeroed before measurement

Resistance measurement between BLK-WHT

Resistance measurement between BLK-RED

Resistance measurement between WHT-RED

Sign off on the compressor winding check

Warning: Ensure the connector between the compressor and the power module (IC700) is disconnected before starting the procedure.

Measure the voltage balance between the terminals. Expected range is 50 - 130 V.

Operation method: Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit.

Measurement point: Measure AC voltage between the lead wires at 3 points.

Voltage between BLK (U)-WHT (V)

Voltage between BLK (U)-RED (W)

Note: 1. Output voltage varies according to power supply voltage. 2. Measure the voltage by analog type tester. 3. During this check, LED of the inverter P.C. board blinks 9 times.

Remove the cabinet and panels. (Refer to section 1.)

Disconnect the lead wire to the reactor and the following connectors:

Pull out the discharge temperature thermistor from its holder.

Pull out the defrost thermistor from its holder.

Pull out the outdoor heat exchanger temperature thermistor from its holder.

Pull out the ambient temperature thermistor from its holder.

Sign off on the thermistor removal

Remove the screws of the service panel

Remove the screws of the top panel

Remove the screw of the valve cover

Disconnect the power supply and indoor/outdoor connecting wire

Remove the screws of the cabinet

Section 1: Cabinet and Panels Removal

Section 2: Disconnecting Connectors

Disconnect the following connectors

Screws fixing the fan motor removed