Service Settings; Setpoint Sources; Setpoint Source Arbitration - Trane Tracer AdaptiView User Manual

Service Settings

The following table lists the settings that are available as buttons on the Service Settings menu
screen, along with their corresponding setting options. The chiller configuration determines
which of the settings appear.
Table 9. Service Settings menu screen: Buttons and available settings options
Evaporator Leaving Water Temp Cutout
XX.X °F/C
Maximum Capacity Limit
XXX.X %
Check Oil Filter Setpoint
XX.XX PSID/kPaD
-or-
Check Lube Filter Setpoint
XX.XX PSID/kPaD
(CVHS Only)
Capacity Control Softload Time
XXX Sec
Condenser Limit Setpoint
XXX.X %
Staging On Boundary
XXX.X %
(Duplex Only)

Setpoint Sources

Some setpoints can be controlled from more than one source; these are referred to as arbitrated
setpoints. Arbitrated setpoints can be:
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•
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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. The following table provides an explanation of how this process
works.
Table 10. Setpoint source choices and corresponding arbitration
Priority
BAS/Ext/FP
Setpoint from the BAS is used.
First
If no BAS setpoint is available (for
example, BAS communication has
Second never been established), a setpoint
from an external control source is
used.
CTV-SVU01G-EN
Low Refrigerant Temperature Cutout
XX.X °F/C
Minimum Capacity Limit
XXX.X %
(Formerly in Chiller Settings)
Startup Lube Diff Pressure Threshold
XX.XX PSID/kPaD
(CVHS Only)
Current Limit Control Softload Time
XXX Sec
Head Pressure Control Pre-Position Setpoint
XXX.X %
Staging Off Boundary
XXX.X %
(Duplex Only)
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.
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E E q q u u i i p p m m e e n n t t S S e e t t t t i i n n g g s s
Local Atmospheric Pressure
XX.X PSI/kPa
BAS Setpoint Power Loss Store Enable
Enable/Disable
Current Limit Softload Start Point
XXX.X %
Head Pressure Control Pre-Position Setpoint
XXX.X %
Front Panel
Setpoint from the front panel is used.
Note: Any setpoint from a BAS or external
control source is ignored.
None
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