CONTROL SYSTEM
12-8 Service Manual – YBZE DCI 1-A.1 GB
When the current IDU operating mode is conflict to other IDUs under operating, the current IDU:
1. IDU display will show “E7”.
2. The operating mode is still transferred to the outdoor unit.
12.7.2 Indoor Coil Defrost Protection
During cooling operation, the signals being sent from the indoor unit allow the operating frequency
limitation and then prevent freezing of the indoor heat exchanger.
Compressor will stop when ICT <= -1C for continuous 10sec.
If the unit stops as such protection for 6 times (the counter will be cleared after the compressor has
run for 7min), it can not resume running automatically and display malfunction, it can resume by
remote control ON/OFF reset.
12.7.3 Indoor/Outdoor Coil over Heating Protection
During heating operation, the signals being sent from the indoor unit/outdoor allow the operating
frequency limitation and prevent abnormal high pressure.
Compressor frequency will be reduced when ICT/OCT reaches above 58C
Compressor will stop when ICT/OCT reaches 65C
If the unit stops as such protection for 6 times (the counter will be cleared after the compressor has
run for 7min), it can not resume running automatically and display malfunction, it can resume by
remote control ON/OFF reset.
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