Control Box Of The Heat Source Unit - Mitsubishi Electric PQHY-P200YLM-A Service Handbook

[ III Heat source Unit Components ]

[2] Control Box of the Heat source Unit

1. Control Box
<HIGH VOLTAGE WARNING>
Electromagnetic relay
(72C)
DC reactor
(DCL)
Noise filter
Power supply terminal block
1) Exercise caution not to damage the bottom and the front panel of the control box. Damage to these parts affect the waterproof
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) When the power is turned on, the compressor is energized even while it is not operating. Before turning on the power, discon-
nect 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 heat source unit. The liquid refrigerant in the compressor will evaporate by energizing
the compressor.
HWE15060
Control box houses high-voltage parts.
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 check that the the voltage of the electrolytic capacitor (Inverter main circuit) is 20VDC or below.
(It takes about 10 minutes to discharge electricity after the power supply is turned off.)
Capacitor Inrush current resistor
(C100)
Ground
terminal
(TB1)
(R1,R5) Note2
Note1
INV board
- 89 -
Control board
M-NET board
Terminal block for
transmission line
(TB3, TB7)
GB