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Appendix B: The Chilled Water System Optimizer Commissioning view of the Properties page
Point Name/Description
Minimum Reset Increment: __ (deg) (output units: 0-10) — The minimum allowed
output increment for each response interval.
Current reset increment is: __ — Displays value.
EXAMPLE If you set this value to 1.0 (deg), the program resets no less than that for
each increment. This does not necessarily equal the actual reset at the chiller,
which may have a range of 42°F to 54°F. Unless the 0-10 (deg) signal is exactly
the 10°F temperature range, the minimum increment may not equal the actual
temperature increment. With a range of 42°F to 54°F, each reset degree is (54°-
42°F)/10 = 1.2°F degrees.
Maximum Reset Increment: __ (deg) (output units: 0-10) — The maximum allowed
output increment for each response interval.
EXAMPLE If you set it to 1.5 (deg), it resets no more than 1.5 (deg) for each
increment. This does not necessarily equal the actual condenser water approach
temperature.
Adjust Reset Gains below:
Reset Increment Coarse Gain (1=min to 10=max) — Determines how large each
reset increment will be. The program applies the gain to various measurements of
the efficiency curve, and determines the next increment size. The larger the gain,
the larger the increment. However, no matter how small or large the gain, the
increment can be no less than the minimum increment and no more than the
maximum increment.
Reset Increment Fine Gain (0=min to 10=max) — A fine gain that is added to each
increment. It can be combined with the above reset increment to configure the best
gain applied to each increment.
More is described about how to set up the gain in the Start-up and Commissioning
(page 31) section.
Bias for reset of CWS temperature setpoint for cooler temperatures - (only if desired,
not a requirement)
The program functions without applying bias. However, there are times that the kW/ton
input can be erratic. Adding bias toward cooler condenser water temperatures
promotes energy savings at the chiller even though the condenser water reset
temperatures may not be the most effective supply temperature for the system.
EXAMPLE The program is very close to resetting toward a cooler temperature, but not
close enough, and still wants to reset for warmer temperatures. The bias shifts the
decision slightly toward resetting for cooler temperatures. Energy savings are biased
toward the chiller rather than the towers.
NOTE Bias is not a required setting.
Add a small bias for reset toward cooler CWS temps? — Turn On for a bias for
cooler temperatures.
Add an additional small bias for reset toward cooler CWS temps: — Adds a fine
adjustment to the small bias (above).
Turn On to increase bias for cooler temperatures and adjust the gain between 0
and 10.
Fine gain for bias for reset toward cooler CWS temps (0=min to 10=max) — Adds
another fine adjustment to the small bias above, increases bias for cooler
temperatures, and adjusts the gain between 0 and 10.
Chilled Water System Optimizer v2
Installation and Start-up Guide
86
Range
D:
1
R:
0.75 to 1.25
D:
2
R:
1.25 to 2.0
D:
5
R:
1 to 10
D:
0
R:
0 to 10
D:
Off
R:
Off/On
D:
Off
R:
Off/On
D:
5
R:
0 to 10
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