Fujitsu ABYG18KRTA Service Manual page 156

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+2°C?
Room temp. <
Ts-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.
No
- (04-14) -
Start
Monitor
mode
Yes
No
No
Yes
No
No
Yes
No
No
other than auto changeover
< 25 °C?
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