Use and Care Manual

MRCOOL DC INVERTER COOLING ONLY CONDENSING UNIT
49
(2) The following situations are not operation failures.
Problem
Time of occurrence
Cause
Mist comes from the air
conditioner.
During operation.
If the unit is running under high humidity, the
wet air in the room will be quickly cooled
down.
The air conditioner generates
some noise.
The air conditioner is buzzing at the beginning
of operation.
Thermostat will be buzzing when it starts
working. The noise will become weak 1min
later.
Dust comes from the air
conditioner.
When the unit is turned on, it purrs.
When the system is just started, the
refrigerant is not stable. About 30s later, the
purr of the unit becomes low.
There is hissing sound when the unit is started
or stopped and a slight hissing sound during
and after operation.
It’s the sound of gaseous refrigerant that stops
flowing and the sound of drainage system.
There is a sound of crunching during and after
operation.
Because of temperature change, front panel
and other components may be swelled up and
cause abrasion sound.
There is a hissing sound when the unit is
turned on or suddenly stopped during
operation or after defrosting.
Because refrigerant suddenly stops flowing or
changes the flow direction.
The unit starts operation after being unused
for a long time.
Dust inside the units come out together with
the air.
The air conditioner generates
some smell.
During operation.
The room smell or the smell of cigarette
comes out through the units.
NOTICE:
Check the above items and adopt the corresponding corrective measures. If the air conditioner continues to
function poorly, please stop the air conditioner immediately and contact a MRCOOL authorized local service
center.
Ask our professional service staff to check and repair the unit.