MCAC-UTSM-2012-12 R410A 50Hz Tropical Split AC
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Judge 1: The wiring between the low pressure switch and main
control board is connected well or correctly
Judge 2: Whether the low pressure switch is broken
Validate: Short connect the low pressure switch
socket, check whether the system can run normally
Check whether the refrigerant system is ok
Judge 3: Check whether the outdoor ambient temperature is too low
Judge 4: The refrigerant of the system is leakage
Validate: Connect the pressure gauge to the gauge joint of the
system, check whether the pressure is lower than 0.15MPa
Leak hunting: charge nitrogen or
refrigerant to the system, if the
leakage is serious, there will be
distinct gas leakage “cici” sound;
if the leakage is little, use the
suds(mixture of water and
abluent is also ok, if it can make
bubble) or electronic leak
detector.
Judge 5: The refrigerant pipe is blocked
Drop refrigerant, then use the high
pressure nitrogen or refrigerant to blow
pipe, vacuumize and add the refrigerant
again
Replace low pressure switch
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