Fujitsu AMUG24LMAS Service Manual page 117

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 + 3.6°F (2°C) ?
NO
Room temp.
Ts - 3.6°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
04-10
T
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?
Setting temperature
:
YES
YES
NO
YES
NO