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Start-up and Commissioning
Condenser Water Temperature Optimizer Reset > Section 1- Condenser Water System Optimizer – Enable
Conditions (page 82)
Set the CWS Optimizer ON Switch to ENABLED.
NOTE This switch enables the condenser water reset portion of the program.
You can observe the changing condenser water temperature setpoint as the program searches for a lower energy
consumption point.
Condenser Water Temperature Optimizer Reset > Section 2 - Manual Overrides of Condenser Water Reset - and
other Settings (page 83)
First response period – first reset
1
After one response period, the temperature is raised by the amount specified in First Reset.
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The condenser water temperature should be lower than the Resting Wet Bulb Approach defined in
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Section 3 - Condenser Water Setpoint Rest - Output & Limit Settings > Condenser Water Optimizer
Operation Overview - Notes > Resting Wet Bulb Approach.>
The program waits for the second response period. During the second response, the program measures
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whether the First Reset temperature reduced the power consumption.
Second response period – second reset
2
After the second response period, the program resets the temperature again by a calculated amount.
○
If the first reset lowered power demand, then the program continues resetting in the same direction.
○
If the first reset increased power demand, then the program recognizes it is resetting in the wrong
○
direction. Since the first reset lowers the supply temperature, then the second reset raises the
condenser water supply temperature.
Third and successive responses — The program will repeat the above process and continue to reset the
3
condenser water temperature setpoint by a new calculated amount. The program continually searches for the
condenser water temperature that best balances energy savings at the chiller with increased energy use at
the condenser water pumps and tower fans.
Condenser water optimizer reset - Tuning
One of the most important settings in the program is the time it takes for the condenser water system to respond
after the optimization program resets the temperature.
The program needs to recognize if the system is using less energy after the setpoint has changed. The response
time is the period that it takes the system to achieve and stabilize at a new setpoint and allow enough time for the
total system power to stabilize at its new demand level.
Adequate response depends on each reset increment being large enough for the condenser water system to
react. The system may not recognize increments that are too small. To make the increment large enough, start the
minimum increment between 1° to 1.5°F and the maximum increment at least 1° to 1.25°F above that.
It is difficult to approximate the response time. If the response time is too small, the optimization program does
not get an accurate measurement of the new energy use because the demand is still changing.
NOTE It is always better to be slightly high rather than low when setting the response time.
Chilled Water System Optimizer v2
Installation and Start-up Guide
42
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