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13.27 Cold Draft Prevention Control
13.28 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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