Trane N512 用户手册

low-speed fan operation. A controller can also receive a BAS-communi-
cated outdoor air damper minimum position.

A BAS-communicated minimum position setpoint has priority over all 
locally configured setpoints. When a communicated minimum position 
setpoint is not present, the controller uses the configured minimum posi-
tion for low fan speed whenever the fan is running at low speed, regard-
less of the occupancy state. See Table 9 and Table 10 for more information 
about how the controller determines the position of the modulating out-
door air damper. 

Unoccupied

Any value

Any value

0% (closed)

Occupied
Occupied bypass
Occupied standby

Valid

Any value

BAS-communicated

Occupied
Occupied bypass
Occupied standby

Invalid

Low

Occupied low fan minimum

Occupied
Occupied bypass

Invalid

Medium/high

Occupied minimum

Occupied standby

Invalid

Medium/high

Occupied standby minimum

No or invalid outdoor air 
temperature

Open to occupied 
minimum position

Open to occupied standby 
minimum position

Closed

Failed outdoor air sensor

Open to occupied 
minimum position

Open to occupied standby 
minimum position

Closed

Outdoor air temperature 
present and economizing 
possible

1

Economizing; damper 
controlled between 
occupied minimum
position and 100%

Economizing; damper 
controlled between
occupied standby 
minimum position and 
100%

Open and economizing 
during unit operation; oth-
erwise closed

Outdoor air temperature 
present and economizing 
not possible

1

Open to occupied mini-
mum position

Open to occupied standby 
minimum position

Closed

1

 For an explanation of the economizing feature, see “Economizing (free cooling)” on page 45.