Panasonic CS-E18NKUA, Service Manual

Page: 37 / 82

37
13.1.5 Compressor Overheating Prevention Control
š
Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The
changes of frequency are as below.
š
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.
13.1.6 Low Pressure Protection Control (Gas Leakage Detection)
š
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.78A and 1.16A.
š
During Cooling and Soft Dry operation:
Indoor suction temperature – indoor piping temperature is below 39.2°F.
š
During Heating operations :
Indoor piping temperature - indoor suction is under 41.0°F.
13.1.7 Low Frequency Protection Control 1
š
When the compressor operates at frequency lower than 25Hz continued for 240 minutes, the operation frequency
will be changed to 24Hz for 2 minutes.
13.1.8 Low Frequency Protection Control 2
š
When all below conditions comply, minimum limit of compressor will be set.
E18NKUA, E24NKUA
Temperature, T, for: Cooling / Soft Dry Heating
Indoor intake air (°F) T < 57.2 or T ≥ 86.0 T < 57.2 or T ≥ 82.4
Outdoor air (°F) T < 55.4 or T ≥ 100.4 T < 39.2 or T ≥ 75.2
Indoor heat exchanger (°F) T < 86.0 T ≥ 32.0
13.2 Protection Control For Cooling & Soft Dry Operation
13.2.1 Outdoor Air Temperature Control
š
The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.
š
This control will begin 1 minute after the compressor starts.
š
Compressor frequency will adjust based on outdoor air temperature.