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Inter face (I/F)
1. System outline .................................................................................. 24
2. System structure ............................................................................... 24
3. Power supply .................................................................................... 28
10. Central control .................................................................................. 52
12. Troubleshooting ................................................................................ 54
Notes on system controller side in I/F connection system
(1) Please do not transmit "STEP 0" during defrost operation.
Defrost operation might be interrupted, and frost remain.
(Please demand the planned capacity step even when the system controller receives defrost signal from the heat
pump (outdoor unit)).
(2) Please do not transmit "STEP 0" when the outdoor unit(H/P) is abnormal.
Abnormal detection data is reset, and an Abnormal point cannot be confi rmed.
CONTENTS
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