Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 97

[ III Heat source Unit Components ]
4. I/O board
CNAC4
230 VAC input
L1 phase
L2 phase
HWE15150
CNPW
Pump interlock signal output
Pump interlock signal output
CNOUT2
12 VDC input
Operation ON signal input (X25)
TB8
Operation ON signal output
Operation ON signal output
Pump interlock signal input
Pump interlock signal input
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TB9
Power Input (24 VAC or 24 VDC) (non-polar)
GND
0-10 VDC signal output
GB