Mitsubishi Heavy Industries SRK100VNXWZRF Service Manual page 171

( l ) Dewing prevention control
[Control condition]
During cooling and dehumidifying operation, if all the following conditions are established, the compressor speed is
reduced to prevent dewing and water splash.
(i) Cooling electronic expansion valve aperture (EEVC) is 500 pulses.
(ii) Suction superheat is more than 10°C.
(iii) Compressor speed is 60 rps or higher.
[Control contents]
(i) The compressor speed is reduced at each 1 minute until EEVC aperture is 460 or lower.
(ii) This control takes 60 rps as its lower limit of compressor speed.
(iii) If cooling electronic expansion valve aperture (EEVC) is less than 460 pulses continuously for 6minutes, protective
control finishes.
(m) Broken wire detection on temperature sensor and low pressure sensor
(i) Outdoor heat exchanger temperature sensor, outdoor air temperature sensor and low pressure sensor
If the following is detected for 5 seconds continuously within 2 minutes to 2 minutes and 20 seconds after the
compressor ON or 20 seconds after power on, the compressor stops. After a delay of 3 minutes, it restarts but, if the
same is detected repeatedly 3 times within 40 minutes, the compressor stops with the anomalous stop.
Note During defrost operation, it is not detected.
• Outdoor heat exchanger temperature sensor: -50°C or lower
• Outdoor air temperature sensor: -45°C or lower
• Low pressure sensor: 0V or under or 4.0V or more
(ii) Discharge pipe temperature sensor, suction pipe temperature sensor, compressor under dome temperature sensor
If the following is detected for 5 seconds continuously within 10 minutes to 10 minutes and 20 seconds after the
compressor ON, the compressor stops. After a delay of 3 minutes, it restarts but, if the same is detected repeatedly 3
times within 40 minutes, the compressor stops with the anomalous stop.
Note During defrost operation, it is not detected.
• Discharge pipe temperature sensor: -10°C or lower
• Suction pipe temperature sensor: -50°C or lower
• Compressor under dome temperature sensor : -50°C or lower
(n) Fan motor error
(i) If compressor moves and the fan of revolution 100min
compressor stops.
(ii) If the above (i) is detected 5 times within 60 minutes from first detection of the above (i), it enters the anomalous
stop mode with E48 displayed on the remote control.
(o) Anomalous stop by the compressor start stop
(i) When a compressor startup failure is received from the inverter PCB, the compressor stops temporarily and restarts
3-minute later.
(ii) If the above (i) is detected 5 times, the compressor stops and E59 is displayed on the remote control.
(iii) 3 minutes after the compressor stops, it becomes possible to restart from the remote control.
(p) Anomaly liquid flooding
(i) Anomalous stop control
1) If the under-dome overheat exceeds the setting value continuously for 15 minutes (first anomalous stop) or 30
minutes (after the second anomalous stop), the compressor stops.
2) When it occurs 3 times within 90 minutes, E44 is displayed on the remote control and it enters the anomalous
stop mode.
(ii) Reset of anomalous stop mode
3 minutes after the compressor stops, it becomes possible to restart from the remote control.
Compressor stop
5
Under-dome overheat (˚C)
170
-
or less is detected for 30 seconds continuously , the
-1
Compressor operation
10
-
'22 • PAC-SM-422