Hitachi RAC-P25YHAB, Manual

Page: 57 / 65

UNDERSTANDING THE OPERATING MECHANISM
Heating capability
• This room air conditioner utilizes a heat pump system that absorbs exterior heat and brings it into a room to
be heated. As the ambient temperature gets lower, heating capability will also lower. In such a situation, the
inverter work to increase compressor rpm to keep the unit’s heating capability from decreasing. If the unit's
heating performance is still unsatisfactory, other heating appliances should be used to augment this unit's
performance.
• The air conditioner is designed to heat an entire room so that it may take some time before you feel warm.
Timer operation is recommended for effective preheating ahead of the desired time.
• When outside temperature becomes lower while humidity remains high, condensation forms on the heat
exchanger of the outdoor unit and the heating efficiency may be affected if condensation is not removed. To
prevent this problem, the air conditioner performs condensation-removing operation automatically. At this
time, the heating operation is suspended and it usually takes approximately 5-10 minutes (maximum of
20 minutes) to resume the heating operation.
Cooling, dehumidifying capabilities
• If the heat present in a room exceeds the unit’s cooling capacity (for example, if there are many people in the
room or other heating appliances are used), the preset room temperature may not be reached.
• The preset temperature may not be reached if a heat source or humidity which exceeds the air conditioner’s
dehumidifying ability is present in the room.
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Piping which is too long could lower the heating/cooling performance.
CAUTION
Do not use a stove or any
other high temperature
devices in proximity to
the indoor unit.
PROHIBITION
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