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(7) Refrigeration cycle system protective control
(a) Starting condition
This control starts when the following conditions are satisfied.
(i) When it has elapsed 30 minutes after the compressor was changed from OFF to ON in the cooling operation mode
for more than 5 minutes.
(ii) When the compressor speed has satisfied the following conditions.
(iii) When the indoor air temperature of running indoor unit (Th1) and the indoor heat exchanger temperature (Th2) have
satisfied the following condition even on one unit.
Compressor speed
Unit
SCM50
60 rps
1
70 rps
2
80 rps
3
(b) Contents of control
(i) Stop the compressor and delay the start, and then restarts.
(ii) Compressor stops by the abnormal stop when the compressor stop has occurred 3 times in one hour.
(8) Crankcase heater
(a) Operating conditions
This control starts when all the conditions below are satisfied.
(i) After the operation mode is changed to stop and the compressor speed becomes 0 rps continuously for 30 minutes.
(ii) When the temperature detected by the outdoor air temperature (Tho-A) is -2°C or lower after the compressor stops.
(b) Detail of operation
The crankcase heater operates, warming up the compressor, then refrigerant begins circulating smoothly when the
air-conditioner starts its heating operation, and heating begins.
(c) Reset conditions
When the temperature detected by the outdoor air temperature (Tho-A) reaches 0°C or higher, or the operation mode
changes from stop to cooling or heating.
(9) Inching prevention
When the compressor becomes to the thermostat operation within 5 minutes since operation start or becomes dehumidify-
ing operation, the operation is continued with the compressor speed of minimum rps forcibly.
Indoor air temperature
(Th1, °C)
SCM60
40 rps
10 < = Th1 < = 40
50 rps
60 rps
-
Indoor air temperature (Th1) and indoor
heat exchanger temperature (Th2)
Th1 - 4 < Th2
Th1 - 3 < Th2
189
-
'18 • SCM-T-251
Duration
5 minute
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Troubleshooting
