Mitsubishi Electric ECOV-X37VA Manuel D'installation page 52

11-4-4. Display of the MAIN board (inside the control box)
Operation status display on LED4
Symbol
oFF Compressor stoppage (by using operation switch)
run Compressor in operation
LPoF Low-pressure cutoff function is stopped.
0H Compressor stoppage (by using capacity control)
00H Compressor preliminary stoppage (during the 3-minute restart delay mode)
000H Compressor error stoppage
oIL1 Oil return operation in progress
Note 1: This model stops the compressor when the solenoid valve <liquid> or other valves are closed and the low pressure
falls below a certain level. (Low-pressure cutoff)
The low-pressure cutoff ON- and OFF-thresholds vary depending on the target evaporation temperature.
Note 2: If the low pressure has not reached the low-pressure cutoff ON-threshold even after the lapse of the low pressure
cutoff restart delay time, the LED repeatedly shows "LPoF," "0H," and "low pressure" in order.
11-5. Checking the unit condition
11-5-1. Regular operation check
Check that the discharge pressure is not abnormally high.
Outside air
temperature 0
(°C)
Discharge
pressure 5.5
(MPa)
Check that the unit's suction gas temperature does not exceed 20°C.
Check if the compressor is not flooding. If the compressor is flooding, adjust the opening of the expansion valve on the load
side.
The solenoid valve may open or close while the compressor is stopping. This is not a malfunction.
• The table below shows the temperature of each part when the unit is properly adjusted.
Evaporation temperature (°C)
[1] Unit suction gas temperature (°C)
[2] Compressor bottom (°C)
[3] Discharge gas temperature (°C)
• Power supply: 3-phase 4-wire, 380 to 415 V, 50 Hz
• Gas cooler return air temperature: 32°C
• Operation at 40 Hz
WT09614X03_GB
Operation status
5 10 15
5.5 5.7 6.0
Suction accumulator
Compressor
[2] Compressor bottom
0 to 10
40 to 65
90 to 110
20 25 30
6.5 7.0 8.0
[3] Discharge
gas pipe
Oil-return expansion
valve
Oil sep-
[1] Suction gas pipe
arator
Strainer <suction>
-10
52
35 40
9.0 9.5
-35
-15 to -5
50 to 75
90 to 110