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Heat Controller, Inc. OWNER’S MANUAL VMH Inverter Mini-Split
10
The following events may occur during normal operation.
1. Protection of the air conditioner.
Compressor protection
• If the unit is stopped and then immediately restarted again, the compressor will not operate for
about 3 minutes in order to protect the compressor.
Anti-cold air (heat pump models only)
• The unit is designed not to blow cold air in HEAT mode, when the indoor heat exchanger is in one
of the following three situations and the set temperature has not been reached.
A) When heating has just starting.
B) Defrosting is occurring
C) Low temperature heating is occurring
Defrosting (Cooling and heating models only)
• The indoor or outdoor fan stop running when defrosting (heat pump models only).
• Frost may accumulate on the outdoor unit during heat cycle when outdoor temperature is low and
humidity is high, resulting in lower heating efciency of the air conditioner.
• During this condition, air conditioner will stop the heating operation and start defrosting automatically.
• Defrost time may vary from 4 to 10 minutes according to the outdoor temperature and the amount of
frost buildup on the outdoor unit.
2. Mist or steam are being emitted
• A white mist may emit from the indoor unit due to a large temperature difference between air inlet
and air outlet in COOL mode in an indoor environment that has a high relative humidity.
• A white mist may emit due to moisture generated from the defrosting process when the air condi-
tioner restarts in HEAT mode operation after defrosting.
3. Typical sounds
• You may hear a low hissing sound when the compressor is running or has just stopped running. This
sound is the sound of the refrigerant owing or coming to a stop.
• You can also hear a low “squeak” sound when the compressor is running or has just stopped run-
ning. This is caused by heat expansion and cold contraction of the plastic parts in the unit when the
temperature is changing.
• A noise may be heard due to louver restoring its original position when power is rst turned on.
• A sizzling sound may be heard occasionally when the unit is defrosting.
4. Dust is blown out from the indoor unit
• This is a normal condition when the air conditioner has not been used for a long time or during rst
use of the unit and an accumulation of dust has formed on the unit’s outlet. Cleaning dust off of the
unit before operation will prevent this.
5. A peculiar smell comes out from the indoor unit
• This is caused by the indoor unit giving off smells permeated from building material, from furniture,
or smoke. A burning smell could mean there is something wrong with the unit. Power off the unit and
call an authorized servicer.
6. Operating mode changes to FAN ONLY mode
• When the indoor temperature reaches the temperature set point on air conditioner, the compressor
will stop automatically, and the air conditioner mode changes to FAN only mode. The compressor
will start again when the indoor temperature rises above the set point in the COOL mode or falls
below the set point in the HEAT mode (heat pump only models).
7. Condensation
• Dripping water may generate on the surface of the indoor unit when cooling in relatively high humid-
ity. Adjust the vertical louver to the maximum air outlet position and select HIGH fan speed. NOTE:
Water could drop onto the oor or objects below the indoor unit.
Typical Operational Occurrences