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REGARDING USE
POINTS THE CUSTOMER SHOULD BE AWARE OF
COMFORT
At startup
After the power is initially turned on, it will take approx. 10 minutes until startup. Usually the unit will start
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in 3 minutes.
HEAT operation
The colder it is outside or the greater the number of indoor units, the longer the time required from the
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start of operation until the emission of warm air (around 95°F / 35°C). When the outside temperature is
23 to 35°F (–5 to 2°C), the inside temperature is 41 to 50°F (5 to 10°C), and total indoor unit combination
is 100% capacity, the first startup of all indoor units in the morning will take approximately 20 to 30 min-
utes.
Oil return operation will be performed once every 8 hours to preserve the lubrication of oil to the com-
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pressor.
Since operation is switched to cooling cycle during HEAT operation in order to return the oil, HEAT oper-
ation will not be possible for around 5 to 10 minutes.
When the outside temperature is 82°F (28°C) or higher, the unit will be set to the standby mode for pro-
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tection.
OPERATING NOISE
At startup
During startup, in order to emit warm or cool air as quickly as possible, the sound of refrigerant flowing
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will be heard for a short time (1 to 2 minutes) from the outdoor unit.
At shutdown
In order to ensure smooth startup the next time this unit is operated, the outdoor unit will continue to oper-
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ate for around 1 minute after shutdown. (The time of continued operation depends on the outside tem-
perature, capacity of connected indoor units, and connection pipe length.)
Cooling at low outside temperatures
During COOL operation when the outside temperature is 68°F (20°C) or less, the fan of the outdoor unit
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will operate at low speed to preserve capacity and the outdoor unit valve will be opened depending on the
pressure conditions, making it more likely that the sound of refrigerant flowing will be heard.
Defrost
When the outside unit is performing defrost operation, the fan of the indoor unit will stop temporarily, and
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the slight sound of refrigerant flowing will be heard.
Excessive heating load
During HEAT operation when the outside temperature is high (59 to 75°F / 15 to 24°C), the fan of the out-
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door unit will be operated at low speed, making it more likely that the sound of refrigerant flowing will be
heard from the outdoor unit.
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