Panasonic CS-E24EKES / CU-E24EKE / CS-E28EKE / CU-E28EKE Service Manual ▷ View online
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12.1.5.
Compressor Overheating Prevention Control
Instructed frequency for compressor operation will be regulated by compressor top temperature. The changes of frequency are as
below figure.
below figure.
12.2. Protection Control For Cooling & Soft Dry Operation
12.2.1.
Outdoor Air Temperature Control
The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.
12.2.2.
Cooling Overload Control
i. Pipe temperature limitation/restriction
• Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation frequency)
• The compressor stop if outdoor pipe temperature exceeds 65
• The compressor stop if outdoor pipe temperature exceeds 65
°C.
• If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95: outdoor high pressure rise protection)
ii. Electrical part temperature rise protection control
• To prevent electrical component temperature rise during cooling overload.
• Judgement condition is by outdoor temperature (sampled every 10s).
• Judgement condition is by outdoor temperature (sampled every 10s).
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• Control contents:
Outdoor fan speed (switch to zone A and B minimum fan speed).
Outdoor total current (zone C) higher than the specified.
Outdoor total current (zone C) higher than the specified.
• Cancellation condition: When one of above is not satisfied.
12.2.3.
Freeze Prevention Control
1. When indoor heat exchanger temperature is lower than 2
°C continuously for six minutes, compressor will stop operating.
2. Compressor will resume its operation three minutes after the indoor heat exchanger is higher than 10
°C.
3. At the same time, indoor fan speed increase +40 rpm compared to its normal operation.
4. If indoor heat exchanger temperature is higher than 10
4. If indoor heat exchanger temperature is higher than 10
°C for five minutes, the fan speed will return to its normal operation.
12.3. Protection Control For Heating Operation
12.3.1.
Intake Air Temperature Control
Compressor will operate at rated freq. or less respectively if either one of the below conditions occur:
1. When the indoor intake air temperature is above 10
°C and remote control setting fan speed is lower Me-.
2. When the indoor intake air temperature is 30
°C or above.
12.3.2.
Outdoor Air Temperature Control
The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the below figures. This
control will begin one minute after the compressor starts.
control will begin one minute after the compressor starts.
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12.3.3.
Overload Protection Control
The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown in below figures.
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13 Servicing Mode
13.1. Auto Switch Operation
The below operations will be performed by pressing the “AUTO” switch.
1. AUTO OPERATION MODE
The Auto operation will be activated immediately once the Auto Switch is pressed.
2. TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE)
The Test Run operation will be activated if the Auto Switch is pressed continuously for more than 5 sec. A “beep” sound will
occur at the fifth sec., in order to identify the starting of Test Run operation.
occur at the fifth sec., in order to identify the starting of Test Run operation.
3. REMOTE CONTROLLER RECEIVING SOUND ON/OFF
The ON/OFF of remote controller receiving sound can be change over by pressing the following step:
a. Release the Auto Switch after Test Run operation is activated.
b. Then, within 20 sec., after a., press Auto Switch for more than 5 sec.
b. Then, within 20 sec., after a., press Auto Switch for more than 5 sec.
A “beep” “beep” sound will occur at the fifth sec., then release the Auto Switch.
c. Within 20 sec. after b., press Auto Switch again. Everytime Auto Switch is pressed (within 20 sec. interval), remote
controller receiving sound status will be reversed between ON and OFF.
Long “beep” sound indicates that remote controller receiving sound is OFF.
Short “beep” sound indicates that remote controller receiving sound is ON.
Long “beep” sound indicates that remote controller receiving sound is OFF.
Short “beep” sound indicates that remote controller receiving sound is ON.
4.
a. When the switch is pressed between 0 to 5 seconds, Auto Mode operation starts to function.
b. When the switch is pressed between 5 to 8 seconds, the unit is forced to operate in Cooling Mode.
b. When the switch is pressed between 5 to 8 seconds, the unit is forced to operate in Cooling Mode.
c. When the switch is pressed between 8 to 11 seconds, the unit will enter forced Heating Mode standby. Press timer
decrement button for 5S for the unit to operate in Heating Mode.
d. When the switch is pressed between 11 to 16 seconds and together with the signal from remote control (timer decrement
button for 5S), the unit can be changed to different controlling setting (4 type of transmission codes).
e. When the switch is pressed between 16 to 21 seconds, either “H14” error detection selection mode or the remote control
signal receiving sound can be cancelled or turned on.
13.2. Selecting The Wireless Remote Control Transmission Code
When there are more than one indoor units installed in the same room, it is possible to set different remote control receiving signal
by modifying the jumpers inside Remote Control.
by modifying the jumpers inside Remote Control.
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