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Point Name/Description
____ optimizer enable if OA Temperature is invalid.
Delays
Wait __:__ (mm:ss) after chiller plant is enabled before checking part load
conditions and further enabling optimization.
Present output is True for 0:00 (mm:ss) — Displays status.
5. AND are Part Load Conditions met? — Set the part load conditions to fit your chiller
plant. The program defaults to run when the chiller plant is operating above 20%.
If the reset is applied at very low load conditions, the plant may cycle off more
frequently when on low load or low delta temperature. The program starts to cool down
to lowest chilled water supply temperature when the load is below the low threshold. —
Displays YES or NO status.
_.___% Current load/capacity — Displays value.
Allow Optimizer Reset if Load is < __% of capacity
hysteresis of __%
6. AND is the Chilled Water Temperature Difference (return-supply) across the chiller
evaporator great enough? — Set a minimum allowed temperature across the
evaporator so the temperature difference will not drop too low. This prevents the chiller
from cycling off on low load too often and helps to stabilize chiller operation. The
optimization program will not start until the temperature drop across the evaporator is
large enough. — Displays YES or NO status.
Chilled Water Temperature Difference — Displays delta temperature in degrees
Allow if (Chilled Water Return Temperature - Chilled Water Supply Temperature) is
> __ degrees
with hysteresis of __ degrees
Delays
1. Wait __ : __ (mm:ss) before disabling algorithm after plant goes out of part load
conditions.
Present output is: True/False for 0:00 (mm:ss) — Displays status.
2. Wait __ : __ (mm:ss) after part load conditions are enabled before starting
optimization.
Present output is : True/False for 0:00 (mm:ss) — Displays status.
3. Pause algorithm when staging up or down: — This encourages algorithm
stability.
Chilled Water System Optimizer v2
Installation and Start-up Guide
Appendix B: The Chilled Water System Optimizer Commissioning view of the Properties page
61
Range
D:
Allow
R:
Disallow/Allow
D:
00:10 (mm:ss)
R:
0:00 to 10:00 (mm:ss)
R:
YES/NO
R:
0 to 100%
D:
90%
R:
60 to 90%
D:
5%
R:
5 to 10%
D:
5°F
R:
3 to 10°F
D:
3°F
R:
1 to 5°F
D:
5:00 (mm:ss)
R:
0:00 to 10:00 (mm:ss)
D:
5:00 (mm:ss)
R:
0:00 to 10:00 (mm:ss)
D:
On
R:
Off/On
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