Outdoor Air Temperature Control; Cooling Overload Control; Dew Prevention Control; Freeze Prevention Control - Panasonic CS-S18HKQ Service Manual

13.10. Outdoor Air Temperature Control

• The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.
• This control will begin 1 minute after the compressor starts.
• Compressor frequency will adjust base on Outdoor Air Temperature.

13.11. Cooling Overload Control

• 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 63 C.
• If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95 indicated: outdoor high pressure rise protection).

13.12. Dew Prevention Control 1

• To prevent dew formation at indoor unit discharge area.
• This control will be activated if:
- Cooling mode or Quiet mode is activated.
- Remote Control setting temperature is less than 25 C.
- Fan speed is at CLo or QLo.
- Room temperature is constant (±1 C) for 30 minutes.
- Compressor is continuously running.
• Fan speed, angle of horizontal louver (vertical airflow angle) will be adjusted accordingly in this control.
- Fan speed will be increased slowly if the unit is in quiet mode but no change in normal cooling mode.
- The angle of horizontal louver will be changed as table below:
Operation Mode
Cooling and e-ion
Soft Dry
13.13. Dew Prevention Control 2
• To prevent dew formation at indoor unit discharge area.
• This control will be activated if the conditions below continues for 20 minutes:
- Cooling mode or Dry mode is activated.
- Indoor suction temperature is between 25 C and 29 C.
- Outdoor air temperature is less than 30 C.
- Fan speed is at Quiet Lo.
• The horizontal louver will be fixed at 24 (regardless of Auto or Manual Airflow Direction Setting).

13.14. Freeze Prevention Control

1. When indoor heat exchanger temperature is lower than 0 C continuously for 6 minutes, compressor will stop operating.
2. Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 13 C.
3. At the same time, indoor fan speed will be higher than during its normal operation.
4. If indoor heat exchanger temperature is higher than 13 C for 5 minutes, the fan speed will return to its normal operation.
Airflow Direction
Auto
Manual
Auto
Manual
42
Vane Angle ( )
1 2 3 4
22 ~ 30
22 24 26 28
22 ~ 30
22 24 26 28
5
30
30