Outdoor unit electrical expansion valve control
1 After supplying power source, the electronic expansion valve is completely opened.
2 When the compressor is stopped, the electronic expansion valve is completely closed to adjust its opening.
3 At starting operation (compressor is operated), opening of the electronic expansion valve is set at a specified opening.
a Specified opening during heating operation: 1 minute
4 During the cooling and the defrosting operations, the electronic expansion valve is set at the specified opening.
5 Normal opening of the electronic expansion valve.
• Coling operation
– 480 pulse (100%)
• Heating operation
1 Set of target temperature
TdSH = 20-25 ºC
2 Simulation PI control for the electronic expansion valve. The electronic expansion valve opening is controlled so
that the thermistor temperatures for the compressor can reach the target temperature.
5 Control System
153
SMGB0060 rev. 1- 12/2010
5
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