Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 85

[ III Outdoor Unit / BC Controller Components ]
(2) Front view of a refrigerant circuit
High-pressure check joint *1
Pressure switch
High-pressure
sensor
4-way valve
Check-valve
block
Ball valve on low pressure
pipe side *1
Ball valve on high pressure
pipe side *1
*1 The diameter of this charge plug is 5/16".
Use the adapter that is supplied with the product if using tools designed primarily for use with 1/4"-diameter materials.
(3) Rear view of a refrigerant circuit
Accumulator
Fusible plug
Low-pressure check joint *1
Fusible plug
Solenoid valve block
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Inverter compressor
Low-pressure sensor
Accumulator
Oil separator
Discharge muffler
Low-pressure sensor