Protection Control For Cooling & Soft Dry Operation - Panasonic CS-RE9SKUA Service Manual

15.1.5 Compressor Overheating Prevention Control

Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The
changes of frequency are as below.

If compressor discharge temperature exceeds 233.6°F, compressor will be stopped, occurs 4 times per
20 minutes, timer LED will be blinking. "F97" is indicated.
15.1.6 Low Pressure Protection Control (Gas Leakage Detection)

For 5 minutes, the compressor continuously operates and outdoor total current is between 0.78A and 1.16A.

During Cooling and Soft Dry operation:
Indoor suction temperature – indoor piping temperature is below 39.2°F.

During Heating operations :
Indoor piping temperature - indoor suction is under 41.0°F.
15.1.7 Low Frequency Protection Control 1

When the compressor operates at frequency lower than 25Hz continued for 240 minutes, the operation frequency
will be changed to 24Hz for 2 minutes.
15.1.8 Low Frequency Protection Control 2

When all below conditions comply, minimum limit of compressor will be set.
15.2 Protection Control For Cooling & Soft Dry Operation
15.2.1 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 based on outdoor air temperature.
233.6°F
230.0°F
212.0°F
Comp Discharge temperature
Temperature, T, for:
Indoor intake air (°F)
Outdoor air (°F)
Indoor heat exchanger (°F)
77.0°F
Compressor = OFF
Compressor Frequency
Reduced
Compressor Frequency
Maintain
Free
RE18SKUA, RE24SKUA
Cooling / Soft Dry
T < 57.2 or T ≥ 86.0
T < 55.4 or T ≥ 100.4
T < 86.0
Free
71.6°F
Limited frequency
63
206.6°F
204.8°F
194.0°F
Heating
T < 57.2 or T ≥ 82.4
T < 39.2 or T ≥ 75.2
T ≥ 32.0