Operation Mode Control For Outdoor Air Unit - Fujitsu Airstage VR-II Series Service Manual

3-2-1 Operation Mode Control for Outdoor air unit

(1) Mode setting
Each possible operation mode in each connectable type is controlled as below.
RB : I.U = 1 : 1
RB : I.U = 1 : 2
(2) Cool and Heat Mode
Each operation mode is controlled as below.
Outdoor air unit Operates according to the
fan motor
HIGH MODE setting.
Drain pump
Pulse controlled by the
Electrical
temperature difference
expansion valve
calculation and
freeze prevention control
Solenoid valve
Closed at all times
(3) Stop mode
Outdoor air unit fan motor : OFF
Electric expansion valve
Drain pump
Solenoid valve
8
RB : I.U = 0 : 1
Cool
Operates according to the
HIGH MODE setting.
Turns ON-OFF by the drain pump control function
Pulse controlled by the
temperature difference.
Opened at thermostat off
and compressor on.
Closed at other operation.
: Stop pulse
: Turns ON-OFF by the drain pump control function
: Closed
Connectable type
Free Cool / Heat
Fix Cool / Heat
Only Cool
: Mode available
: Mode unavailable
X
Heat
Operates according to the
HIGH MODE setting.
Stop pulse
Closed at all times
03-03 +1
Cool Dry Heat Fan
X
X
X X
Fan