Deice Control - Panasonic CS-A7HKD Service Manual

• After 30 sec. from compressor OFF (thermo OFF), Indoor fan will run at SSLo speed only.
• Anti Cold Draft Control will stop when:
- Intake temperature < set temperature. (Time Delay Safety Control 4 minutes waiting is valid)
- 30 Minutes Time Save Control activates.

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:
• 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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