Auto Changeover Operation - Fujitsu AMUG24LMAS Service Manual

3. AUTO CHANGEOVER OPERATION

When AUTO mode is set using a remote control,
optimum operation mode is selected from Heating, Cooling and Monitoring mode.
In operation, optimum mode is automatically switched by temperature changes.
Set temperature can be set between 64°F (18°C) and 86°F (30°C) by 1°F (0.5°C).
When operation starts, indoor fan and outdoor fan are operated for around 1 minutes.
1
Room temperature and outdoor temperature are sensed, and the operation mode is selected
in accordance with the table below. <Monitoring mode>
Operation mode selection table
Room temperature (TR)
TR > Ts+ 3.6°F (2°C)
Ts + 3.6°F (2°C) ≥ TR ≥ Ts - 3.6°F (2°C)
TR < Ts - 3.6°F (2°C)
*
If it's Middle zone, operation mode of indoor unit is selected as below.
(1). 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.
(2). Selected by the outdoor temperature.
If outdoor unit is operating in other than Cooling and Heating mode, indoor unit will be operated
according to the outdoor temperature as below.
Outdoor temperature zone selection
Temperature
77°F (25°C) and over
75.2°F (24°C) and under
2
When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the Cooling or Heating mode was selected at
to Monitoring and the operation mode is selected again.
When the middle zone is selected on the predetermining of the operation mode, the operation mode
3
before the changing to the monitor mode is selected.
Operation mode
Cooling
*
Middle zone
Heating
Mode
Cooling
Heating
1
above, operation is switched
04-09
TR : Room temperature
Ts : Setting temperature