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Start-up and Commissioning
Reset Gain
Reset Gain and the Minimum and Maximum Reset Increments are interdependent and you might need to adjust
both more than once.
The reset gain determines the reset increment and, consequently, the condenser water supply temperature.
After the program has been running a while and if each increment is often at either the minimum or maximum,
then you can adjust the Reset Gain.
Each reset increment should fall between the minimum and maximum limits
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The reset increment frequently increases over a response period, which is normal
○
If most often at the Minimum Increment, then raise the reset gain
○
If most often at the Maximum Increment, then lower the reset gain
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Optional - Add Bias for cooler Condenser Water Supply Temperatures
After the program has been running a while, the condenser water temperature could be running warmer than
expected. This could be any one of the following reasons:
It is the best temperature for optimum energy use
The system power, flows, or variable fan speed drives are turbulent or fluctuate irregularly
There is a piping or design issue
The program calculations could be misconfigured
NOTE Smoothing can help address the problem, but may not completely remove the impact on the calculations.
If you are concerned about warmer temperatures:
Add smoothing and give a bias toward cooler water and energy savings at the chiller(s), turn each Bias switch
to On.
Fine tune the Bias, for lower energy savings at the chiller versus lower "system wide" energy savings.
Chilled Water System Optimizer v2
Installation and Start-up Guide
44
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