Setpoint Sources; Setpoint Source Arbitration - Trane AdaptiView Operation Manual

Equipment Settings

Setpoint Sources

Some setpoints can be controlled from more than one source. These are referred to as arbitrated
setpoints and are identified by footnote (a) in
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Setpoint Source Arbitration

The Tracer UC800 uses a process referred to as setpoint source arbitration to prioritize the selection
of the setpoint source. See
Table 7. Setpoint source choices and corresponding arbitration
Priority BAS/Ext/FP
First Setpoint from the BAS is used.
If no BAS setpoint is available (for
example, BAS communication has
Second
never been established), a setpoint
from an external control source is used.
If no BAS nor external setpoint is
available (for example, BAS
Third communication has never been
established), a setpoint from the front
panel is used.
1. For service or troubleshooting, it may be helpful to set the setpoint source to front panel to isolate the chiller from other control sources.
2. If BAS communication was established and then lost, in most instances the BAS values remain and can be used by the chiller controller.
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Communicated from a building automation system (BAS)—Refers to a Trane or other BAS that
can communicate with chiller controls over a network.
Set by an external control source (Ext)—Refers to inputs that are hard-wired directly to local
chiller controls, carrying low-voltage binary (On/Off) or analog (0–10 Vdc,
4–20 mA) signals.
Set at the front panel (FP)—Refers to inputs that are entered by an operator using the Tracer
AdaptiView display or by a technician using the Tracer TU service tool.
Ext/FP
Setpoint from a external control source is
used.
If no externally controlled setpoint is
available, a setpoint from the front panel is
used.
Note: Any setpoint from a BAS is ignored.
None
Table
Table 7 for an explanation of how this process works.
6. Arbitrated setpoints can be:
Front Panel
Setpoint from the front panel is used.
Note: Any setpoint from a BAS or external
control source is ignored.
None
None
CTV-SVU02A-EN