Panasonic CU-2E15PBD / CU-2E18PBD Service Manual ▷ View online
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11.2 Heating Operation
11.2.1 Outdoor fan control
When heating operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted
according to figure below for Heating overload control:
11.2.2 Heating Room Temp Sampling Control
To improve the judgment accuracy, indoor room temperature sampling starts when any indoor unit has stopped
capability supplied (heating thermo-off) during heating operation with compressor ON, outdoor unit will send
signal to all thermo-off indoor units to ON fan motor and get room temperature sample.
signal to all thermo-off indoor units to ON fan motor and get room temperature sample.
To prevent discharge temperature drop at indoor units which is ON when sampling the room temperature of
heating thermo-off units, the compressor frequency is increased accordingly.
However, if indoor room temperature is much higher compare to remote control setting temperature, before
thermo-off, sampling of corresponding indoor unit will be cancelled.
11.2.3 Powerful Operation 2
During cooling / heating operation, this control is to provide fast cooling / heating operation compare to normal
operation.
Operation start if all condition below are complied:
o
Powerful operation ON for indoor unit.
o
Not under Annual Cooling control.
Operation
content:
o
Outdoor fan speed will adjust automatically.
o
Compressor
frequency
will adjust automatically.
Operation stop when comply either one of the follow conditions:
o
When the powerful operation is OFF for all indoor units.
o
When annual cooling control activated.
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12. Simultaneous Operation Control
Operation modes which can be selected using the remote control unit:
o
Automatic, Cooling, Dry, Heating and e-ion operation mode.
Types of operation modes which can be performed simultaneously
o
Cooling operation and Cooling, Dry or e-ion operation.
o
Heating operation and Heating operation.
Types of operation modes which cannot be performed simultaneously
o
During cooling operation, heating operation is impossible at another indoor unit in another room.
o
The priority is given to cooling operation if the cooling mode is selected first. In another room where heating
mode is selected afterward, the POWER LED blinks to indicate the heating operation is in standby condition,
where the fan is stopped hence no discharged air.
where the fan is stopped hence no discharged air.
o
During heating operation, cooling operation is impossible at another indoor unit in another room.
o
The priority is given to heating operation if the heating mode is selected first. In another room where cooling
mode is selected afterward, the POWER LED blinks to indicate the cooling operation is in standby condition,
where the fan is stopped hence no discharged air.
where the fan is stopped hence no discharged air.
Operation mode priority control
o
The operation mode designated first by the indoor unit has priority.
o
If the priority indoor unit stops operation or initiates the fan operation, the priority is transferred to other indoor
units.
“Waitin
g” denotes the standby status in which the POWER LED blinks (ON for 2.5 seconds and OFF for 0.5 seconds)
and the fan is stopp
ed.
In the e-ion mode, priority is transferred to a non-priority unit.
Note
C: Cooling operation mode
D: Dry operation mode
H: Heating operation mode
E: e-ion operation mode
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13. Protection
Control
13.1 Freeze Prevention control (Cool)
When received freeze prevention signal from indoor unit, the compressor frequency changes according to indoor
heat exchanger temperature.
When indoor unit request capability OFF due to freeze condition, immediately the capability supply to targeted
indoor unit stops.
13.2 Dew Prevention control (Cool)
When received dew prevention signal from indoor unit, which according to indoor intake temperature and indoor
heat exchanger temperature the compressor frequency changes.
13.3 Electronic Parts Temperature Rise Protection 1 (Cool)
This control prevents electronic parts temperature rise during cooling overload condition.
Start
conditions:
o
Outdoor ambient temperature is at protection region as shown in figure below:
o
Outdoor unit total current is above 5.0A
Control
content
o
Outdoor fan speed is adjusted accordingly.
Control
stop
condition
o
When outdoor ambient temperature is back to normal region.
During this control, outdoor fan speed does not reduce for Quiet operation.
13.4 Electronic Parts Temperature Rise Protection 2 (Cool)
This control prevents electronic parts temperature rise during cooling/dry operation.
Start
conditions:
o
Total current is at protection region as shown in figure below:
Control
content
o
Outdoor fan speed is adjusted accordingly.
Control
stop
conditions
o
When total current is back to normal region.
During this control, outdoor fan speed does not reduce for Quiet operation.
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13.5 Cooling overload control (Cool)
This control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling
operation.
13.6 Heating overload control (Heat)
This control detect indoor pipe temperature and perform the compressor frequency restriction during heating
operation.
This control detect outdoor ambient temperature and perform the fan speed adjustment during heating operation.
13.7 Extreme Low Temperature Compressor low pressure protection control
(Heat)
This control is to prevent low pressure drops too low during extremely low outdoor ambient temperature to
improve the compressor reliability.
During heating operation, when outdoor ambient temperature is in Zone 1, this control will be activated.
Compressor frequency restriction will be based on outdoor piping temperature.
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