Electra ELAU-VBZ214-H11, Руководство по обслуживанию, Страница: 48 / 73

CONTROL SYSTEM
12-8 Service Manual – VBZ DCI 1-A.1 GB
12.8.1 Mode confliction
When there are different mode settings among active indoors:
a. First request priority:
The first IDU which requests different mode than STBY mode will set the new operation mode.
Mode confliction will be decided comparing with other IDUs’ modes. Cool (Dry) mode is conflict to
Heat mode.
The mode will change once all the units exit the current operation mode.
b. Fan mode is conflict to Heat mode:
Heat Mode is the priority mode, Fan Mode is conflict to Heat Mode no matter the IDU is first IDU or
not. The indoor will run in Heat Mode.
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.
12.8.2 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
power reset.
12.8.3 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
power reset.