Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 93

[ III Outdoor Unit / BC Controller Components ]
4. RELAY BOARD (RELAY BOARD)
(1) PUHY/PURY
CN51C2
51C2 Contact input
CN52C2
52C2 driving output
1 - 5 AC 208/230V
CN52F
52F driving output
1 - 3 AC208/230V
CNOUT2
Relay drive output
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CNRT2
1 - 5 52C2,52F,CH12
Power input (AC 208/230V)
1 - 3 51C2 Detection signal output
CNCH
CH12 output
1 - 3 AC 208/230V