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12.13 Cold Draft Prevention Control
12.14 Deice Control
Deice starts to prevent frosting at outdoor heat exchanger.
Normal Deice
Deice operation detection commences in Heating operation starts or 60 minutes after previous deice operation. If
the outdoor piping temperature drops to -4°C for 50 sec. continuously during compressor is in operation, deice
will start.
(There is no detection during Outdoor Fan stops.)
Overload Deice
During heating operation, if the outdoor Fan OFF duration (due to overload protection control) is accumulated up
to 60 minutes and after compressor starts for 1 minute, deice starts.
Deice ends when
(a) 12 minutes after deicing operation starts;
(b) The outdoor piping temperature rises to about 12°C.
After deice operation, compressor stops for 30 seconds and 4-way valve stays at cooling position for 10 seconds.
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