Compressor Overheating Prevention Control (For S18, S24Mk, S28Mk Only); Low Pressure Prevention Control (Gas Leakage Detection); Compressor Tank Temperature Rise Protection Control; Low Frequency Protection Control 1 - Panasonic CS-S9MKQ Service Manual

13.4.2 S18MK, S24MK, S28MK
•
Overheating Prevention Control
When the IPM temperature rises to 100°C, compressor operation will stop immediately.
o
Compressor operation restarts after 3 minutes the temperature decreases to 95°C.
o
•
DC Peak Current Control
When electric current to IPM exceeds set value of 18.5A, the compressor will stop operate.
o
During operation starts, if the DC peak current is detected after 30 seconds, the operation will restart
after 2 minutes.
During operation starts, if the DC peak current is detected within 30 seconds, the operation will restart
after 1 minute.
After compressor starts for 30 seconds, if DC peak current is detected exceeding 18.5A and this condition
o
repeats continuously for 7 times, all indoor and outdoor relays will be cut off. Timer LED blinks and "F99"
indicated.
13.5 Compressor Overheating Prevention Control (For S18, S24MK, S28MK
only)
•
Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The
changes of frequency are as below.
•
If compressor discharge temperature exceeds 112°C, compressor will be stopped, occurs 4 times per 20 minutes,
timer LED will be blinking. "F97" is indicated.

13.6 Low Pressure Prevention Control (Gas Leakage Detection)

•
Control start conditions
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.65A and 1.65A.
o
During Cooling and Soft Dry operation:
o
Indoor suction temperature – indoor piping temperature is below 4°C
•
Control contents
Compressor stops (and restart after 3 minutes).
o
If the conditions above happened 2 times within 20 minutes, the unit will:
o
Stop operation
Timer LED blinks and "F91" indicated.

13.7 Compressor Tank Temperature Rise Protection Control

•
Control start conditions
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.65A and 1.65A.
o
During Cooling and Soft Dry operation:
o
Indoor suction temperature -indoor piping temperature is below 4°C.
Indoor temperature and outdoor temperature is 30±5°C.
Remote Control setting 16°C and Hi Fan Speed.
•
Control contents
Compressor stops (and restart after 3 minutes)
o
If the conditions above happened 2 times within 20 minutes, the unit will:
o
Stop operation
Timer LED blinks and "F91" indicated.

13.8 Low Frequency Protection Control 1

•
When the compressor operates at frequency lower than 24Hz continued for 20 minutes, the operation frequency
will be changed to 23Hz for 2 minutes.
Compressor=OFF
112°C
Compressor Frequency
Reduced
110°C
Compressor Frequency
100°C
Maintain
Comp Discharge temperature
80
97°C
96°C
90°C
Free