Install Manual

Page 35
mrcool.com
Maintenance
The following situations are not operation failures.
NOTICE
Check the above items and take appropriate corrective measures. If the air conditioner continues to
improperly function, please turn off the air conditioner immediately and contact MRCOOL
®
Technical
Support, at [phone], or your installing dealer.
Problem Time of Occurrence Cause
Mist comes from the
conditioner.
The air conditioner
generates noise.
The air conditioner
generates smells.
Dust comes from
the air conditioner.
During operation.
System switches to heating mode after
defrosting.
The air conditioner is buzzing when
operation begins.
When the unit is turned on, it purrs.
If the unit is running under high
humidity, the wet air in the room will be
quickly cooled down.
Defrosting process will generate some
water, which will turn to vapor.
Thermostat will be buzzing when it
starts working. The noise will become
weak 1 minute later.
When the system has just started, the
refrigerant is not stable. About 30
seconds later, the purr of the unit will
become low.
The unit starts operation after not being
used for an extended period of time.
Dust inside the unit is dispersed with
the airflow.
During operation.
Smells from the operating environment
may be pulled through the air handler
and dispersed through the system.
It is the sound of the 4-way valve
switching directions. The sound will
disappear after the valve is in position.
About 20 seconds after the unit first
enables heating mode or when
defrosting under heating mode.
It is the sound of gaseous refrigerant
that has stopped flowing and the sound
of the drainage system.
There is a hissing sound when the unit
has started or stopped and a slight
hissing sound during and after
operation.
This is because refrigerant suddenly
stops flowing or the flow changes
direction.
There is a hissing sound when the unit is
turned on or suddenly stopped during
operation or after defrosting.
Because of temperature change, the
front panel and other components may
swell and cause an abrasive sound.
There is a crunching sound during and
after operation.