Fujitsu ACUH09LUAS1, Service Manual

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2. Auto changeover operation
→hen the air conditioner is set to AUTO mode by remote controller, operation starts in the optimum
mode from among heating, cooling, dry and monitoring modes. During operation, the optimum mode
is automatically switched in accordance with temperature changes. The temperature can be set be-
tween 64.4°F (18°C) and 86.0°F (30°C) in 1.8°F (1.0°C) steps.
• →hen operation starts, indoor fan and outdoor fan are operated for around 1 minute.
Room temperature and outdoor temperature are sensed, and the operation mode is selected in
accordance with the table below.
Room temperature Operation mode
Tr > Ts + 3.6°F (2°C) Cooling
Ts + 3.6°F (2°C) ≥ Tr ≥ Ts - 3.6°F (2°C) Middle zone
Tr < Ts - 3.6°F (2°C) Heating
Tr: Room temperature
Ts: Setting temperature
NOTE: →hen the operation mode is middle zone, indoor unit operation mode is selected as below.
• Same operation mode is selected as outdoor unit.
If outdoor unit is operating in cooling and heating mode, indoor unit will be operated by
the same operation mode.
• Selected by outdoor temperature.
If outdoor unit is operating in other than cooling and heating mode, indoor unit will be op-
erated according to the outdoor temperature as below.
Outdoor temp. Operation mode
77.0°F (25°C) or more Cooling
Less than 77.0°F (25°C) Heating
• →hen the compressor was stopped for 6 consecutive minutes by temperature control function af-
ter the cooling or heating mode was selected as above, operation is switched to monitoring mode
and the operation mode selection is done again.
• →hen the middle zone is selected on the predetermining of the operation mode, the operation
mode before the changing to the monitoring mode is selected.
- (04-8) -
2. Auto changeover operation
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TR
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