Fujitsu R410A, Service Instruction

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