Appendix B: The Chilled Water System Optimizer Commissioning view of the Properties page
Chilled Water System Optimizer v2
CARRIER CORPORATION ©2019
Installation and Start-up Guide
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Section 3 - Condenser Water Setpoint Reset - Output & Limit Settings
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Section 3 - Condenser Water Setpoint Reset - Ouput & Limit Settings
Point Name/Description
Range
Condenser Water Supply Setpoint Range – Based on OA Wet Bulb Temperature
Maximum Wet Bulb Approach __ degrees
— The approach when the reset is at its
lowest - equivalent to the tower fans running slower as the condenser water
temperature setpoint is warmer.
D:
R:
12°F
9 to 12°F
Resting Wet Bulb Approach __ degrees
— The default approach, or base condenser
water temperature setpoint, when the optimization program is off. The general
default is set close to, but not below, the tower design efficiency. It can be any
value between the maximum and minimum approach.
EXAMPLE
The resting approach may be 7°F above wet bulb temperature, which is
appropriate, since it is between a high of 12°F and a low of 5°F.
D:
R:
8°F
7 to 9°F
Resting: Use CWS Setpoint: __ degrees
— The default temperature or resting
condenser water temperature setpoint, when the optimization program is off.
D:
R:
75°F
72 to 78°F
Instead of the "Resting Wet Bulb Approach" above?
D:
R:
NO
NO/YES
Minimum Wet Bulb Approach __ degrees
— The approach when the reset is at its
highest. This is the same as tower fans running faster as the condenser water
temperature setpoint is coolest.
D:
R:
5°F
4 to 7°F
Condenser Water Supply Temperature – High Limits
To prevent chiller surge and other high condenser water temperature issues, high
temperature limits are established by the following:
Outside Air Ratio — As the outside air wet bulb temperature rises, set a ratio to limit
the condenser water supply temperature
Simple high temperature limit — Do not allow the condenser water temperature to
rise above a specific setpoint.
NOTE
These safeties are not meant to work as primary high limit safeties. You also
need high limit safeties at the cooling tower or the facility's local cooling tower program.
Vary condenser water supply temperature high limit based on outdoor air wet bulb
temperature
As outdoor air wet bulb temperature rises (from __ degrees
...
D:
R:
78°F
70 to 80°F
...
to __ degrees)
D:
R:
85°F
80 to 90°F
Limit condenser water supply temperature (from __ degrees
...
D:
R:
79°F
76 to 82°F
