Panasonic CS-A18CKE / CU-A18CKE / CS-A24CKE / CU-A24CKE Service Manual ▷ View online
Soft Dry Operation Time Diagram
Quiet Operation Control
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• Same as Quiet Operation Control for Cooling Mode operation.
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CS-A18CKE CU-A18CKE / CS-A24CKE CU-A24CKE
Time Delay Safety Control
Overload Protection Control
4-way Valve Control
Hot Start Control
8.4. Heating Mode Operation
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• Heating in operation according to Remote Control setting.
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• When the compressor is stopped by Power Switch, Remote Control or there is a power failure, it restarts after 3 minutes when
the Power Switch, Remote Control is turned ON or the power supply is resumed.
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• When the setting temperature is reached during heating operation, the compressor stops and it will not start for 4 minutes.
(a) Outdoor Fan Control
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• If the temperature of the Outdoor Heat Exchanger less than -3°C, Outdoor Fan is ON. The Outdoor Fan stop, when Outdoor
Heat Exchanger temperature is T
b
or more according to Outdoor Air Temperature region as table below:
The Outdoor Fan restarts when the indoor heat exchanger temperature falls to 49°C.
During starting of Heating mode and after deice, Outdoor Fan ON for 90 sec. (Hi).
(b) Compressor High Pressure Control
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• If the indoor heat exchanger becomes 68°C or more, the compressor will stop and restart automatically.
(Time Delay Safety Control - 4 minutes waiting).
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• 4-way valve ON during Heating operation, except deicing operation.
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• When the unit is switched to “OFF” during Heating operation, 4-way valve stays at Heating position for 5 minutes.
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 reaches 42°C.
Maximum Hot start duration = 4 minutes. After 4 minutes,
Hot start operation will be shifted to normal Heating operation.
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CS-A18CKE CU-A18CKE / CS-A24CKE CU-A24CKE
Automatic Fan Speed Mode
Anti Cold Draft Control
Compressor Reverse Rotation Protection Control
When Automatic Fan Speed is selected at Remote Control during heating operation.
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• Fan speed rotates in the range of Me → SLo according to the heat exchanger temperature.
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• If the compressor is operating continuously for 5 minutes or longer and the temperature difference between indoor heat
exchanger and intake air is 5°C or less for 2 minutes, compressor will stop and restart automatically.
(Time Delay Safety Control is valid)
(Time Delay Safety Control is valid)
! T = Indoor heat exchanger temperature - Intake air temperature
This is to protect reverse rotation of the compressor when there is a instantaneous power failure.
This is to protect reverse rotation of the compressor when there is a instantaneous power failure.
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CS-A18CKE CU-A18CKE / CS-A24CKE CU-A24CKE
Heating Operation Time Diagram
Deicing Control
Deice starts to prevent frosting at outdoor heat exchanger.
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• Normal Deicing
Deice operation detection commences in Heating operation starts or 60 minutes after previous deice operation. If the
outdoor piping temperature drops to -4°C for 50 sec. continuously during compressor is in operation, deice will start.
outdoor piping temperature drops to -4°C for 50 sec. continuously during compressor is in operation, deice will start.
(There is no detection during Outdoor Fan stops.)
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• 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.
after compressor starts for 1 minutes, deicing starts.
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• Deicing ends when
(a) 12 minutes after deicing operation starts;
(b) The outdoor piping temperature rises to about 12°C.
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• After deicing operation, compressor stops for 30 seconds and 4-way valve stays at cooling position for 10 seconds.
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CS-A18CKE CU-A18CKE / CS-A24CKE CU-A24CKE
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