2. TRS senses the outdoor piping temperature rises to 4°C (TRS
OPEN).
3. Deicing will not end immediately as time delay (Td) is valid as
shown below.
Time taken from deicing starts to TRS OPEN (T) Td (seconds)
T < 3 minutes 0
3 minutes T < 6 minutes
60
6 minutes T < 9 minutes
120
T 9 minutes
180
- Once deicing operation starts, it will not end for 60 seconds.
- After deicing operation, compressor stops for 30 seconds and 4-
way valve stays at cooling position for 10 seconds.
Normal Deicing Time Diagram
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