Fujitsu AUXB04GALH Service Manual page 47

3-2-2 Auto Changeover Heating / Cooling Operation for Outdoor air unit
Function is available when an outdoor air unit set as the administrative indoor unit (Management Outdoor air unit).
Refer to the setting Method
Setting Method
1. Switch operation mode management to "Management by outdoor air unit" by Outdoor unit PUSH-SW.
2. Set the master outdoor air unit by wired remote controller.
3. Judge cooling/heating by the difference between the master outdoor air unit's setting temperature
and the suction airflow temperature
AUTO CHANGEOVER operation
Operation flow chart
START
Suction airflow temp.
Ts+5°C ?
NO
Suction airflow temp.
Ts- 5°C ?
HEATING OPERATION
Thermostat remains
YES
in OFF state for 6 minutes or
longer?
System stops
YES
or operation command other than
auto changeover operation?
YES
T Setting temperature
NO
:
S
YES
NO
NO
COOLING OPERATION
Thermostat remains
in OFF state for 6 minutes or
longer?
NO
System stops
or operation command other than
auto changeover operation?
NO
03-07
YES
YES