Midea MHC-96HWD1N1 Technical Manual page 50

Midea R410A Full DC Inverter Split Type Series Technical Manual
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.
 Shift from cooling mode to air supply mode.

In order to prevent frosting of the indoor heat exchanger, the air conditioner shifts to air
supply mode automatically, and resumes to cooling mode in a short time.

When the room temperature decreases to the set temperature, the air conditioner will
shut down the compressor automatically, and shifts to the air supply status. After the
room temperature rises, the compressor will restart. The action of the compressor in
the heating mode is the contrary.
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MCAC-UTSM-201406