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13.14 Deice Control
Deice starts to prevent frosting at outdoor heat exchanger.
• Normal Deice
Deice operations detection commences after 30 minutes of Heating operation starts or 60 minutes after previous
deice operation. If the TRS (Thermal Reed Switch) senses the outdoor piping temperature drops to -3°C (TRS
CLOSE) or less 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 minutes, deice starts.
• Deice ends when
1. 12 minutes after deicing operation starts;
2. TRS senses the outdoor piping temperature rises to 4°C (TRS OPEN).
※ Deice will not end immediately as time delay (Td) is valid as shown below:
Time taken from deicing starts
to TRS OPEN (T)
Deice recovery time Td (seconds)
T ≤ 1 minute 1 min. wait (Min.) 0
1 minutes < T < 3 minutes T 0
3 minutes < T < 8 minutes T + 60 sec. 60
8 minutes < T < 11 minutes T + 120 sec. 120
T > 11 minutes 12 min. wait (Max.) -
• Once deice operation starts, it will not end for 60 seconds.
• After deice operation, compressor stops for 30 seconds and 4-way valve stays at cooling position for 10 seconds.
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