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Point Name/Description
Bias for reset of CHWS temperature setpoint for warmer temperatures
The program works as intended without applying bias. However, there are times that the
kW/ton input can be erratic. Adding bias toward warmer temperatures promotes energy
savings at the chiller, even though the chilled water reset temperatures are not
necessarily the most effective supply temperature for the system.
EXAMPLE The program is very close to resetting toward a warmer temperature, but not
close enough, and still wants to reset for cooler temperatures. This bias shifts the
decision slightly toward resetting for warmer temperatures. Energy savings are biased
toward the chiller rather than the towers.
NOTE Bias is not required.
Add a small bias for reset toward warmer CHWS temps? — Turn On for a bias for
warmer temperatures.
Add an additional small bias for reset toward warmer CHWS temps? — This adds a
fine adjustment to the small bias (above).
Turn On to increase bias for warmer CHWS temperatures and adjust the gain
between 0 and 10.
Fine gain for bias for reset toward warmer CHWS temps (0=min to 10=max) —
This adds another fine adjustment to the small bias above, increases bias for
warmer temperatures, and adjusts the gain between 0 and 10.
Reset Output
Expected chilled water supply setpoint temperature. The programmed "0 - 10 (deg)"
output is converted to the chilled water temperature setpoint signal compatible with
your system, feeding directly to the chiller setpoint adjust, either in your chiller manager
or each chiller program.
The chiller setpoint adjust requires an actual temperature range, such as 42 to 52°F.
If the chiller setpoint adjust requires a 0 - 10 input signal, then you must still convert
the above (i.e. 42 to 52°F) to a 0 - 10 signal in the chiller manager or each chiller
program. This is not done in the optimization program.
Vary chilled water supply temperature from __ degrees — Defines the minimum
allowable chilled water temperature
to __ degrees.
Defines the maximum allowable chilled water temperature
Current Setpoint Input
Use the current chilled water setpoint (CURR STPT IN) as the optimizer's starting
setpoint? — The optimizer's beginning setpoint when first enabled.
16 CURR STPT IN (ANI2) — Displays value.
Allows lockout if Lock at value: is checked. Allows communication if Enabled?: is
checked.
Chilled Water System Optimizer v2
Installation and Start-up Guide
Appendix B: The Chilled Water System Optimizer Commissioning view of the Properties page
79
Range
D:
Off
R:
Off/On
D:
Off
R:
Off/On
D:
5
R:
0 to 10
D:
42°F
R:
42 to 46°F
D:
52°F
R:
48 to 54°F
D:
NO
R:
NO/YES
D:
Unlocked (unchecked)
R:
Unlocked (unchecked)
Locked (checked)
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