03-04
3-2-1 Operation Mode Control for Outdoor air unit
(2) Cool and Heat Mode
Outdoor air unit
fan motor
Operates according to the
HIGH MODE setting.
Cool
Drain pump
Turns ON-OFF by the drain pump control function
Electrical
expansion valve
Solenoid valve
Pulse controlled by the
temperature difference
calculation and
freeze prevention control
Each operation mode is controlled as below.
(1) Stop mode
Outdoor air unit fan motor : OFF
Electric expansion valve
Drain pump
: Stop pulse
: Turns ON-OFF by the drain pump control function
Solenoid valve : Cl
osed
Operates according to the
HIGH MODE setting.
Heat
Pulse controlled by the
temperature difference.
Each operation mode is controlled as below.
Fan
Operates according to the
HIGH MODE setting.
Stop pulse
Closed at all times
Opened at thermostat off
and compressor on.
Closed at other operation.
Closed at all times
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