1-9. ELECTRONIC EXPANSION VALVE CONTROL
01-23
The most proper opening of the electronic expansion valve is calculated and controlled under the
present operating condition based on the following values.
The compressor frequency, the temperatures detected by the discharge temperature sensor, the
indoor heat exchanger sensor, the outdoor heat exchanger sensor, and the outdoor temperature
sensor.
Initialization (Input of 528 pulses toward closing direction) is operated under the following conditions.
It apply to all of EEV.
Power-on.
4 hours has passed from the last initialization, and when the compressor starts.
.
.
.
.
(Table 9 : Pulse range of outdoor unit EEV)
40 ~ 480
Pulse range
32 ~ 480
0 ~ 480
Pulse range
35 ~ 480
Dry / Cooling
Heating
Main EEV
Operation mode
Dry / Cooling
Heating
Branch box
Operation mode
Main EEV
Bypass EEV
Subcool EEV
(Table 10 : Pulse range of branch box EEV)
There is a case that EEV is full close at 32 10 pulse.
+
-
If 12 hours has passed from the last initialization, the compressor is compulsorily stopped.
3 minutes has passed from the protection stop of outdoor unit.
< Initialization conditions >
1. Pulse range
2. Initialization
During heating operation, lower limit is 0 pulse.
Outdoor unit
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