Panasonic CS-W18CKE / CU-W18CKE / CS-W24CKE / CU-W24CKE 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-W18CKE CU-W18CKE / CS-W24CKE CU-W24CKE
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-W18CKE CU-W18CKE / CS-W24CKE CU-W24CKE
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 an instantaneous power failure.
This is to protect reverse rotation of the compressor when there is an instantaneous power failure.
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CS-W18CKE CU-W18CKE / CS-W24CKE CU-W24CKE
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-W18CKE CU-W18CKE / CS-W24CKE CU-W24CKE
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