DC Inverter Multi
VRF Service Manual
145
Open the Cut-off
valve of liquid pipes
Open the Cut-off valve of
high pressu re gas pipes
Open the Cut-off valve for
Oil balance pipe(when the quantity
of modular is more than one.)
2) Check if the refrigerant in the system is normal by manomenter connecting liquid pipe and valve of low pressure
gas pipe.
In normal conditions, if the system has been stoodby for more than 3 min, the high pressure and low pressure of the
system will be in balance. The difference between saturation temperature corresponding to pressure value and ambient
temperature (the temp is indoor temp or outdoor temp, whichever is the higher) can’t be more than 5
. Note: make sure
that the system is not started up or it has been energized for more than 10 min since last stop of running (The lower outdoor
ambient temp is, the longer time that the pressure value stabilizes), or the high pressure value of the system will be much
higher than the ambient temp or the low pressure of the sytem will be much lower than the ambient temp)
Eg:
If outdoor ambient temp is 30
, indoor ambient temp is 28 , high pressure value of the system is 28 and low
pressure value is 27 , all differentials between outdoor ambient temp and the others are within 5 which means the
standby pressure of the system is normal.
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