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2 Stop Operation
The stop operation occurs for one of the three following reasons:
1. Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs the system makes a 'stop with
thermo off' operation and an error code is displayed on the outdoor unit digital displays.
2. The system stops when the set temperature has been reached.
3 Standby Control
3.1 Crankcase Heater Control
The crankcase heater is used to prevent refrigerant from mixing with compressor oil when the compressors are stopped.
The crankcase heater is controlled according to outdoor ambient temperature and discharge temperature. When the
outdoor ambient temperature is above 40°C, the crankcase heater is off; when the outdoor ambient temperature is below
35°C, the crankcase heater is controlled according to discharge temperature. Refer to Figures 3-3.1 and 3-3.2.
Figure 3-3.2: Crankcase heater controlled according to discharge temperature
Figure 3-3.1: Crankcase heater controlled according to outdoor ambient temperature
Ambient temperature < 35
Crankcase heater is controlled according to discharge temperature
Discharge temperature < 40
Crankcase heater off
o
C
Ambient temperature > 40
Crankcase heater off
o
C
Discharge temperature > 50
Crankcase heater on
41
o
C
o
C
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