0.17MPa
0.15MPa
Release protection 3
Main EEV of Branch Box opens
Low
pressure
(Fig. 31 : Low pressure protection 3)
<Start condition>
During the compressor in operation, low pressure sensor detects
lower than 0.15MPa.
<Operation>
Main EEV of Branch Box opens untill the release condition.
<Release condition>
Low pressure sensor detects more than 0.17MPa.
If the compressor stopped, it restarts after 3 minutes ST.
Hold
LOW PRESSURE PROTECTION 3 (For Cooling / Dry mode)
8. EEV FULL CLOSE PROTECTION CONTROL (Heating mode)
7. ANTIFREEZING CONTROL (Cooling and Dry mode)
<Start condition>
When all the following conditions are met for the 2 times in a row.
1. During compressor in operation
2. After 20 minutes from compressor start-up.
3. Indoor unit heat exchanger temperature - Room temperature < 4°C
<Operation>
Outdoor unit is stopped and EEV is initialized.
<Release condition>
After 3 minutes ST, compressor will restart.
<Start condition>
When the indoor heat exchanger temperature sensor detects lower than 3°C.
<Operation>
Main EEV of branch box is closed.
<Release condition>
When indoor heat exchanger becomes more than 7°C.
To prevent the indoor unit heat exchenger freezing.
Operation condition of EEV is checked from the temperature difference
indoor heat exchanger and room temperature.
01-46
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