Trouble Shooting; Phenomena Not Attributable To Faults Of Air Conditioner - Midea MTA1-76HR Technical Manual

Midea R22 T1 side-discharge duct manual

4. Trouble shooting

4.1 Phenomena not attributable to faults of air conditioner


The system does not run.

After pressing the ON/OFF button, the system does not run immediately.

If the Run indicator is on, it indicates the air conditioner runs in the normal status.

It does not run immediately because the safety device in the system is active to prevent
overload.

Three minutes later, the air conditioner compressor will run automatically.

If the Run indicator and the Defrost/Preheat indicator are on, it indicates the heating mode
is selected. At the beginning after startup, since the compressor does not run, the
temperature of the indoor unit is too low.

The indoor unit gives out white aerosol.

This phenomenon may occur when the indoor relative humidity is too high and the unit runs
in the cooling mode.

The indoor unit is installed in a place where there is much oil mist or dust. If the internal stain
of the indoor unit is heavy, the temperature in the room will be distributed unevenly. In the
case, the interior of the indoor unit must be cleaned. The cleaning units must be performed
by professional maintainers.

This phenomenon may also occur when the air conditioner shifts from defrosting operation
to heating operation. That is because the moist generated by defrosting is expelled as
steam.

Noise of air conditioner

When the air conditioner runs in the cooling, dry or heating mode automatically, grave
continuous sizzles may occur. That is the sounds of refrigerant flowing between the indoor
unit and the outdoor unit. The sizzles may be heard shortly after the unit stops running or
when the unit runs in the defrost mode. That is the sound raised because the refrigerant
stops flowing or changes to the volume of flow.

Squeak may occur when the air conditioner starts or stops running. That is the sound raised
because the plastic assemblies inflate or deflate when the temperature changes.

Dust is blown out of the indoor unit.
When the air conditioner resumes service after a long period out of service, the dust in the indoor
unit will be blown out.

The indoor unit gives out smell.
The indoor unit absorbs the smell of the room, furniture or smoking, and gives it out when
running.
30
MCAC-UTSM-201301-01