Fujitsu ADUH09LUAS1 Service Manual page 121

Operation flow chart
Heating operation
Thermostat remains
Yes
in off state for 6 minutes
or longer?
System stops
Yes
or operation command
other than auto changeover
operation?
Room temp. >
Ts+3.6°F(2°C)?
Room temp. <
Ts-3.6°F(2°C)?
Middle zone
Auto change over is
second or more?
Operation mode of
outdoor unit: Cooling?
Yes
Operation mode of
outdoor unit: Heating?
No
Yes
Outdoor temp.
< 77.0°F(25°C)?
No
- (04-9) -
Start
Monitor
mode
Yes
No
No
Yes
No
No
Yes
No
No
other than auto changeover
No
Ts: Setting temperarure
Operation mode before
the monitor mode
is cooling mode?
Yes
Cooling operation
Thermostat remains
Yes
in off state for 6 minutes
or longer?
No
System stops
Yes
or operation command
operation?
No
2. Auto changeover operation