Refrigerant lacking
protection (U4)
Test the system's high
pressure 30 minutes after the
whole machine is halted
Is the saturation temperature
corresponding to the high pressure five or
more Celsius degrees lower than the outdoor
temperature?
Transfer the tested high
pressure into the
corresponding saturation
temperature
Check the pipeline in case
of leakage after only the
indoor unit with the
smallest capacity works
continuously for 30
minutes in the cooling
mode.
Is the system injected with
refrigerant as required?
Add refrigerant
as required.
Start the system and enable only the
IDU with the miminum capacity for
refrigerating. Keep the IDU running
for a continuous 30 minutes. Then,
the system is detected to have
leakage. In this case, check the
piping system.
Is the high pressure of
the operating module higher than 15
degrees?
Check the pipeline in
case of leakage.
Is the system injected with
refrigerant as required?
Add refrigerant
as required.
Add another 3 kg of
refrigerant.
NO NO
NO
NO
YES
YES
YES
YES
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