Control Box Of The Heat Source Unit - Mitsubishi Electric City Multi PQHY-P72 Service Handbook

[2] Control Box of the Heat Source Unit

1. PQHY/PQRY-P72 and P96 models
(1) Under the circuit board cover
Gateamp board
Power circuit board
Bleeder resistance(R2)
Transformer(T)
(2) Sub box
Pump interlock input
Terminal block for
operation-ON signal output (TB8)
ACCT-U phase ACCT-W phase
Choke coil
(L1,L2)
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[ III Heat Source Unit / BC Controller Components ]
DCL ... Rear
DCCT
Smoothing capacitor(C1)
Electromagnetic relay(52C)
In-rush current protection(R1)
Diode stack(DS)
Control circuit board
Noise filter(NF)
Terminal block for centralized
control system
transmission line(TB7)
Terminal block for
indoor/outdoor (heat source)
transmission line(TB3)
Terminal block for power supply(TB1)
Relay board