Start-up and Commissioning
Chilled Water System Optimizer v2
CARRIER CORPORATION ©2019
Installation and Start-up Guide
39
All rights reserved
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 the chilled 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
○
The reset increment frequently increases over a response period, which is normal
○
If most often at the
Minimum Reset Increment
, then raise the reset gain
○
If most often at the
Maximum Reset Increment
, then lower the reset gain
Optional - Bias for warmer Chilled Water Supply Temperatures
After the program has been running a while, the chilled water temperature could be running cooler 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 tonnage inputs are turbulent and fluctuate irregularly
There is a piping or design issue
The program calculations could be misconfigured
NOTE
Smoothing can help address the problem caused by turbulence or fluctuations in measurements.
If you are concerned about cooler temperatures:
Add smoothing and give a bias toward warmer supply temperatures and energy savings at the chiller(s) by
turning each Bias switch to On.
Fine tune the Bias, for lower energy savings at the chiller versus lower "system wide" energy savings.
Condenser water optimizer reset
Before starting this section, you must have already completed the sequence specified in General conditions and
status and completed the Chilled water optimizer reset.
Before commissioning the
Condenser Water Temperature Optimizer Reset
, verify the
Chilled Water Temperature
Optimizer Reset
>
Section 1. Chilled Water System Optimizer - Enable Conditions
(page 69) >
CHWS Optimizer
ON Switch
is set to
DISABLED
.