Panasonic CS-A73KR Service Manual page 31

(There is no detection during Outdoor Fan stops.)
- Overload Deicing
During heating operation, if the outdoor Fan OFF duration (due to
overload control) is accumulated up to 60 minutes and after
compressor starts for 1 minutes, deicing starts.
- Deicing ends when
1. 12 minutes after deicing operation starts;
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)
- 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
T < 3 minutes
3 minutes T < 6 minutes
6 minutes T < 9 minutes
T 9 minutes
31
Td (seconds)
0
60
120
180