Outdoor Temperature Protected Operation For Outdoor Air Unit; Cool Operation; Heat Operation - Fujitsu Airstage VR-II Series Service Manual

3-6-4 Outdoor temperature protected operation for Outdoor air unit

1. COOL OPERATION

The contents of operation is controlled as following based on the suction airflow temperature.
a) Operation mode management is made
"Management by indoor unit", and
outdoor air unit is master indoor unit.
Suction airflow
temperature rises
68°F
(20°C)
50°F
(10°C)
23°F
(-5°C)
Forced thermostat off
and Fan off

2. HEAT OPERATION

The contents of operation is controlled as following based on the suction airflow temperature.
Suction airflow
temperature rises
70°F
(21°C)
23°F
(-5°C)
Forced thermostat off
and Fan off
3. FAN OPERATION
The contents of operation is controlled as following based on the suction airflow temperature.
a) Operation mode management is made
"Management by indoor unit", and
outdoor air unit is master indoor unit.
Suction airflow
temperature rises
50°F
(10°C)
23°F
(-5°C)
Forced thermostat off
and Fan off
Suction airflow
temperature drops
Cooling operation
Fan operation
Heating operation
Suction airflow
temperature drops
Fan operation
Heating operation
Suction airflow
temperature drops
Fan operation
Heating operation
b) Cases Other than (a)
Suction airflow
temperature rises
68°F
(20°C)
64°F
(18°C)
50°F
(10°C)
41°F
(5°C)
19°F
(-7°C)
66°F
(19°C)
19°F
(-7°C)
b) Cases Other than (a)
Suction airflow
temperature rises
50°F
(10°C)
41°F
(5°C)
19°F
(-7°C)
+1
03-12
Suction airflow
temperature drops
Cooling operation
Fan operation
Forced thermostat off
and Fan off
Suction airflow
temperature drops
Fan operation
Forced thermostat off
and Fan off
64°F
(18°C)
41°F
(5°C)
41°F
(5°C)