Mitsubishi Electric PURY-P200YLM-A(1) Service Handbook page 108

[4-1 Outdoor Unit Circuit Board Arrangement ]
1) Exercise caution not to damage the bottom and the front panel of the control box. Damage to these parts affect the water-
proof and dust proof properties of the control box and may result in damage to its internal components.
2) Faston terminals have a locking function. Make sure the cable heads are securely locked in place. Press the tab on the ter-
minals to remove them.
3) Control box houses high temperature parts. Be well careful even after turning off the power source.
4) Perform the service after disconnecting the outdoor unit fan board connector (CNINV) and the inverter board con-
nector (CN1). Before plugging in or unplugging connectors, check that the outdoor unit fan is not rotating and that
the voltage between SC-P and SC-N on the capacitor board is 20 VDC or less. The capacitor may collect a charge and
cause an electric shock when the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.
5) To connect wiring to TB7, check that the voltage is 20 VDC or below.
6) Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN1) back to the inverter board after
servicing.
7) When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components.
Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that
the capacitor voltage (inverter main circuit) has dropped to 20 V DC or less. It takes about 10 minutes to discharge electricity
after the power supply is turned off.
8) When the power is on, the compressor or heater is energized even while the compressor is stopped. Before turning on the
power, disconnect all power supply wires from the compressor terminal block, and measure the insulation resistance of the
compressor. Check the compressor for a ground fault. If the insulation resistance is 1.0 MΩ or below, connect all power supply
wires to the compressor and turn on the power to the outdoor unit. It is energized to evaporate the liquid refrigerant that has
accumulated in the compressor.
HWE1314A
- 97 -
GB