Auto Changeover Operation - Fujitsu R410A Service Instruction

4. AUTO CHANGEOVER OPERATION

When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum
mode from among the HEATING, COOLING and MONITORING modes.
During operation, the optimum mode is automatically switched in accordance with temperature changes.
The temperature can be set between 64°F(18°C) and 86°F(30°C) in 2°F(1°C) steps.
AUTO CHANGEOVER operation flow chart
HEATING OPERATION
YES
Thermostat remains
in OFF state for 6 minutes or
longer?
NO
YES
System stops
or operation command other than
auto changeover operation?
NO
START
Monitor mode
Room temp.
Ts+4 °F (2 °C) ?
NO
Room temp.
Ts -4 °F (2 °C) ?
NO
Middle zone
Auto change over is
second or more?
NO
Operation mode of
outdoor unit : Cooling?
NO
YES
Operation mode of outdoor unit
: Heating?
NO
YES
Outdoor temperature<
77°F(25°C)?
NO
01-03
T Setting temperature
:
S
YES
YES
Operation mode
before the monitor mode is
cooling mode?
NO
YES
COOLING OPERATION
Thermostat remains
in OFF state for 6 minutes or
longer?
System stops
or operation command other than
auto changeover operation?
YES
YES
NO
YES
NO