Mitsubishi Electric MUZ-LN25VGHZ Service Manual page 47

N Check of the outdoor refrigerant circuit
Has the operation stopped
during pump down?
Yes
The operation has stopped to pre-
vent the diesel explosion caused by
air trapped in the refrigerant circuit.
Close the stop valve, and disconnect
the power plug or turn the breaker
OFF. *
* CAUTION : Do not start the opera-
tion again to prevent
hazards.
OBH768
Was the operation started with
the stop valve closed, and was
No
it opened during operation?
No
The refrigerant gas amount may be
60% or less than the normal amount.
Identify where the gas is leaking from,
and fi x the leak.
47
The unit occasionally stops when the
stop valve is opened or closed during
operation. Open the stop valve and
Yes
start the cooling operation again.