Heating Operation - Panasonic CU-4E23JBE Service Manual

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:
• 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.
• To prevent discharge temperature drop at indoor units which is ON when sampling the room temperature of heating thermo-off
units, the outdoor fan speed will be adjusted accordingly.
• However, if indoor room temperature is high compare to remote control setting temperature, sampling of corresponding indoor
unit will be cancelled.
11.2.2. Powerful Operation 1
• During cooling operation, this control is to concentrate outdoor unit capability to the powerful operation enabled indoor unit by
temporary stop the capability supply to low load demand indoor units.
• Operation start condition:
- Powerful operation ON for targeted indoor unit
• Operation content:
- If other indoor units (where Powerful operation are OFF) achieve setting temperature continuously for 1 minutes after
received powerful command from indoor unit, then capability supply to other indoor units are stopped for minimum 3 minutes.
Capability supply stop period follows powerful operation period.
• Operation stops when comply either one of the following conditions:
- When other indoor units (where Powerful operation are OFF) is lower than setting temperature.
- When the powerful operation is OFF for all indoor units.
- When Quiet operation received from 1 indoor unit.
- When protection control starts.
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:
- Powerful operation ON for indoor unit.
- Not under Annual Cooling control.
• Operation content:
- Outdoor fan speed will adjust automatically.
- Compressor frequency will adjust automatically.
• Operation stop when comply either one of the follow conditions:
- When the powerful operation is OFF for all indoor units.
- When annual cooling control activated.
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