56
CNT-SVX05A-EN
Configuration
Configurable parameters
The Tracer
™
AH.540 controller is factory configured and commissioned with
fixed sequences of operation. All of the controller's configuration parameters are
predefined and loaded based upon the air handling unit configuration. The Trane
Rover™ service tool provides access to these parameters to make adjustments
to the controller's operation.
The Tracer AH.540 contains configuration parameters for the air handling unit
type to select the type of control mode, cooling source, heating source, face and
bypass damper, and outdoor air damper. Refer to Table 30. The control mode
selects the desired unit operation: constant volume space temperature control,
constant volume discharge air temperature control, or variable air volume
control.
Table 31 — Tracer AH.540 unit type configuration parameters
Table 32 — Heating and cooling source
Note 1:
In a preheat unit configuration, the heating coil is located in the air stream before the cooling coil (when present).
In a reheat unit configuration, the heating coiling is located in the air stream after the cooling coil.
Table 33 — Analog outputs
Note 1:
Trane’s Rover service tool uses the unit type to determine and download the proper default analog output
configuration. For example, if you configure the controller's control mode to be constant volume space temperature
control, Rover will not allow AO 1 to be configured for a supply fan speed output. Analog output 1 (AO 1) is only used
when the controller is configured for variable air volume control.
Note 2:
The normally open/closed configuration item refers to the inactive state of the end device, such as a cooling
valve. If the device is a normally open valve, the configuration for analog output 2 (AO 2) must be normally open.
Note 3:
A normally face damper is positioned full coil face, and a normally bypass damper is full coil bypass when the
analog output is at oVDC.
Control mode
Temperature control
• Constant volume
• Variable air volume
• Space temperature
• Discharge air
Cooling source
Heat type
(Note 1)
Heat source
Face and bypass
damper
Outdoor air
damper
None
Hydronic
• Preheat
• Reheat
• Hot water
• Steam
• None
• Face and
bypass damper
• None
• Outdoor air
damper
Analog output
(Note 1)
Function
Output voltage
range
Valid range
(Note 2)
Default value
AO 1
Supply fan speed
0 to 10VDC or
2 to 10VDC
Normally slow or
Normally fast
0 to 10VDC
Normally open
AO 2
Cool output
0 to 10VDC or
2 to 10VDC
Normally open or
Normally closed
2 to 10VDC
Normally closed
AO 3
Heat output
0 to 10VDC or
2 to 10VDC
Normally open or
Normally closed
2 to 10VDC
Normally open
AO 4
Face and bypass
damper
0 to 10VDC or
2 to 10VDC
Normally face or
Normally bypass
(Note 3)
2 to 10VDC
Normally face
AO 5
Outdoor air damper
0 to 10VDC or
2 to 10VDC
Normally open or
Normally closed
2 to 10VDC
Normally closed
