Overload Protection Control; 4-Way Valve Control; Hot Start Control - Panasonic CS-A9MKD Service Manual

13.24 Overload Protection Control

•
Outdoor Fan Control
If the temperature of the Outdoor Heat Exchanger less than -3°C, Outdoor Fan is ON. The Outdoor Fan stop,
o
when Outdoor Heat Exchanger temperature is Tb or more according to Outdoor Air Temperature region as
table below:
The Outdoor Fan restarts when the indoor heat exchanger temperature falls to 49°C.
Outdoor Air
Temperature
Tb
During starting of Heating mode and after deice, Outdoor Fan ON for 90 sec. (Hi).
•
Compressor High Pressure Control
If the indoor heat exchanger becomes 68°C or more, the compressor will stop and restart automatically.
o
Time Delay Safety Control is activated before the compressor restart.
o

13.25 4-Way Valve Control

•
4-way valve always on during Heating operation. (except deicing operation)
•
When the unit is switched off by remote control during Heating operation, the 4-way valve stay at Heating
position for 5 minutes.
•
This is to prevent the refrigerant flow process sound for being occur.

13.26 Hot Start Control

•
Hot start control is to prevent cool air discharge into room when heating operating starts.
•
Hot start is executed after heating operation starts and deice operation is completed.
•
Indoor fan control during hot start is shown below:
•
When indoor pipe temperature over 34°C or maximum 240 seconds, hot start is completed.
•
During hot start and for 2 minutes after hot start completed, intake thermostat is ignored and no Thermo OFF.
< 10°C ≥ 10°C ~ < 15°C ≥ 5°C ~ < 20°C ≥ 20°C ~ < 25°C
≥ 5°C ≥ 3°C
Indoor Pipe Temperature
≤ 30°C
30°C < t ≤ 34°C
t ≥ 34°C
≥ 1.5°C ≥ 0.5°C
Indoor Fan
OFF
SLo
Lo-
86
≥ 25°C
Outdoor Fan
OFF
≥ -0.5°C