Panasonic CS-A18DKD Service Manual page 23

• Compressor high pressure protection
− If the indoor heat exchanger becomes 68°C or more, the compressor will stop and restart automatically.
− Time Delay Safety Control is activated before the compressor restart.
8.5.9. 4-Way Valve Control
• 4-way valve always on during Heating operation. (except deicing operation)
• When the unit is switched off by remote control during Heating operation, the 4-way valve stay at Heating position for 5 minutes.
• This is to prevent the refrigerant flow process sound for being occur.
8.5.10. Outdoor Fan Motor Control
• When compressor stops (reaches room temperature), outdoor fan will operate for 30 seconds (forced operation).
• This is to release the heat and to obtain the lowest pressure as fast as possible.
8.5.11. Hot Start Control
• Hot Start Control is to prevent cool air discharge into the room when heating operation start.
• When Heating operation starts, Indoor fan will not start until the indoor heat exchanger reaches 30°C as diagram shown.
• Hot start is completed when indoor heat exchanger rises to 42°C or operation over 4 minutes.
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CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD