Panasonic CS-A12CTP / CU-A12CTP5 / CS-A18CTP / CU-A18CTP5 / CS-A24CTP / CU-A24CTP5 Service Manual ▷ View online
a) Normal Deicing Time Diagram
2) A18CT, A24CT
Deice starts to prevent frosting at outdoor heat exchanger.
• 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.)
• 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.
• Deicing ends when
(a) 12 minutes after deicing operation starts;
(b) The outdoor piping temperature rises to about 12°C.
• After deicing operation, compressor stops for 30 seconds and 4-way valve stays at cooling position for 10 seconds.
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CS-A12CTP CU-A12CTP5 / CS-A18CTP CU-A18CTP5 / CS-A24CTP CU-A24CTP5
(b) Overload Deicing Time Diagram
7.4. Automatic Mode Operation
1. When the Automatic Mode Operation is selected, the indoor fan operates at SLo fan speed for 25 seconds to sense intake air
temperature and determine the 1st operation mode. If indoor intake air temperature is less than 16°C, Heating mode will
immediate operate.
immediate operate.
2. Operation mode will be determine again after 1 hour of operation, if the room temperature reaches to set temperature and
compressor off time is over 7 minutes 30 seconds continuously.
The present operation mode will be continued, if the room temperature does not reach to set temperature (Compressor keeps running)
eventhough after 1 hour from automatic operation mode started.
eventhough after 1 hour from automatic operation mode started.
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CS-A12CTP CU-A12CTP5 / CS-A18CTP CU-A18CTP5 / CS-A24CTP CU-A24CTP5
Cooling or Soft Dry Operation
Purpose is to obtain a comfortable room temperature while
sleeping. When you press the SLEEP Mode, the following
movement will start to avoid overcooling.
sleeping. When you press the SLEEP Mode, the following
movement will start to avoid overcooling.
• Sleep shift operation starts, when the room temperature
reaches the setting temperature or after 1 hour of operation.
• The setting temperature will be risen by 0.5°C at the start of
operation and by 0.5°C one hour later .
• The airflow volume will automatically change to Lo- fan
speed.
• Sleep Mode operation time is 8 hours, the operation will be
stop after 8 hour.
• When used together with the Timer, the Timer has priority.
Present
Judgement
Next Mode
Mode
Cooling
Soft Dry
Heating
O
O
Cooling
23°C
Cooling
(Judgement:
Not Applicable
(Judgement:
Heating
23°C & Above)
Below 23°C)
O
O
Soft Dry
23°C
Soft Dry
Not Applicable
(Judgement:
(Judgement:
Heating
23°C & Above)
Below 23°C)
O
O
Heating
Cooling
(Judgement:
Not Applicable
(Judgement:
23°C
Heating
23°C & Above)
Below 23°C)
Automatic Set Temperature
Refer 3. as below.
Refer 3. as below.
3. Automatic Set Temperature
For each operation, set temperature will automatically set as shown below.
However it can be selected 2°C higher or 2°C lower from standard set temperature by pressing the “Room Temperature Setting
button”.
button”.
Operation
Hi
(Standard)
Lo
(+2°C)
(±0°C)
(-2°C)
Cooling
27°C
25°C
23°C
Soft Dry
24°C
22°C
20°C
Heating
23°C
21°C
19°C
• The mode judging temperature and standard setting temperature can be increased by 2°C, by open the circuit of JX6 at
indoor electronic controller.
7.5. Sleep Mode Auto Operation
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CS-A12CTP CU-A12CTP5 / CS-A18CTP CU-A18CTP5 / CS-A24CTP CU-A24CTP5
Heating Operation
Purpose is to obtain a comfortable room temperature while
sleeping. When you press the SLEEP Mode, the following
movement will start to avoid overheating.
sleeping. When you press the SLEEP Mode, the following
movement will start to avoid overheating.
• Sleep shift operation starts, when the room temperature
reaches the setting temperature or after 1 hour of operation.
• The setting temperature will be decrease by 2°C at the start
of operation and by 3°C one hour later.
• The fan speed refer to Indoor Fan Motor Control.
• Sleep Mode operation time is 8 hours, the operation will be
• Sleep Mode operation time is 8 hours, the operation will be
stop after 8 hour.
• When used together with the Timer, the Timer has priority.
7.6. Random Auto Restart Control
• If there is a power failure during air conditioner operation, operation will be automatically restarted after 3 to 4 minutes when the
power is resumed. It will start with previous operation mode and airflow direction.
• Restart time is decided randomly using 4 parameter:
Intake air temperature, setting temperature, fan speed and Air Swing Blade position.
• Random Auto Restart Control is not available when Timer is set.
• This control can be omitted by open the circuit of JX5. (Refer Circuit Diagram)
• This control can be omitted by open the circuit of JX5. (Refer Circuit Diagram)
7.7. Delay ON Timer Control
• When the Delayed ON Timer is set by using the remote control, the unit will start operate slightly before the set time, so that
the room will reach nearly to the set temperature by the desired time.
• For Cooling and Soft Dry mode, the operation will start 15 minutes before the set time.
• For Heating mode, the operation will start 30 minutes before the set time.
• For Automatic mode, the indoor fan will operate at SLo speed for 25 seconds, 30 minutes before the set time to detect the
• For Heating mode, the operation will start 30 minutes before the set time.
• For Automatic mode, the indoor fan will operate at SLo speed for 25 seconds, 30 minutes before the set time to detect the
intake air temperature to determine the operation mode. The operation indication lamp will blink at this time.
7.8. Remote Control Signal Receiving Sound
• Long beep sound will be heard when:-
− Stopping the Air Conditioner using ON/OFF switch.
• Short beep sound will be heard for others.
• To switch off the beep sound:-
• To switch off the beep sound:-
Press the “Automatic Operation Button” continuously for 10 seconds or more (“beep” “beep” will be heard at the 10th second).
Repeat the above if you want to switch ON the beep sound.
However, if the “Automatic Operation Button” has been pressed the Automatic operation will be activated.
If you do not require this operation, you may change it by using the remote control.
If you do not require this operation, you may change it by using the remote control.
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