Heating Operation; Outdoor Quiet Cooling Operation Control - Panasonic CU-2TZ41TBE Service Manual

12.2 Heating Operation

12.2.1 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:
12.2.2 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.

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.
12.2.3 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.
o
Not under Annual Cooling control.
o

Operation content:
Outdoor fan speed will adjust automatically.
o
Compressor frequency will adjust automatically.
o

Operation stop when comply either one of the follow conditions:
When the powerful operation is OFF for all indoor units.
o
When annual cooling control activated.
o

12.3 Outdoor Quiet Cooling Operation Control


Purpose
Provide quiet cooling operation when only 1 indoor in operation.

Start Condition
Indoor fan speed is lower than Lo fan.
o
Only 1 operation indoor unit.
o
Not in any cooling overload zone.
o
Not during annual cooling
o
Not initial frequency operation.
o
Not during starting control.
o
Not during "Electronic part temperature rise protection by outdoor air & total current"
o
Not during "Electronic part temperature rise protection by total current"
o
Not during "IPM temperature rise prevention control"
o
During cool mode
o
All conditions above are satisfied and function selection enable.

Control Contents
Compressor frequency and outdoor fan speed maximum limit is set. Adjust accordingly.
12°C
OD temp.
Compressor frequency
Cool/Quiet #27 Hz
RPM controlled
10°C
RPM free
Outdoor fan speed
#400 rpm
31