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Appendix B: The Chilled Water System Optimizer Commissioning view of the Properties page
Point Name/Description
Pause CHWS reset algorithm (holds logic at current state and output): — To
manually pause the chilled water supply, select PAUSE. When you no longer need
the pause, select OFF and the application begins again from its holding pattern.
Pause & Hold is:___ — Displays OFF or ON status..
Alarm if the "Pause CHWS reset algorithm" above is on longer than _:__ (mm:ss)
with output of ____ for _:__ (mm:ss) — Displays status and value.
CHW MAN PAUSE ALARM (BALM) __ — Displays Off or On status.
Manual "Quick Cool Down" - Override of the Optimizer Reset & Lower the Supply
Temperature Setpoint
Quick Cool Down (lowers chws temperature): — A manual override to drop chilled
water supply temperature.
This is a manual cool down of the chilled water supply temperature used to override
the chilled water optimization and to cool down the facility. Turn the switch to Quick
Cool Down and the temperature drops immediately by the cool down temperature
increment (defined below), and then the temperature cools down by the same
amount each Response Time (set in the following section).
The cool down continues until minimum reset is reached. To turn off Quick Cool
Down, select Off and the program begins again, starting from the current reset
temperature.
Quick Cool Down incremental drop: __ (deg) - Drop per Response Interval — This is
the incremental amount the chilled water supply temperature is dropped (initially
and each response period) when in Quick Cool Down. Input your desired amount
and its response time.
This incremental drop also applies to:
Automatic cool down described in Section 2 - Automatic Overrides of Chilled Water
Resets (page 70)
Cool down to default low temperature when not in part load conditions described as
Step 5 in Section 1 - Optimizer - Primary Enable Conditions (page 60)
Quick Cool Down is: __ — Displays OFF or ON status.
First Reset
First Reset - Raise Temperature initially by: __(deg) — The first reset should be
large enough for the system to register the reset temperature and respond to it, but
not so large that it creates instability. If the temperature increment is too small,
then the system won't experience enough temperature change to determine if it
saves energy.
The program measures the decrease (or possible increase) in kW/ton from this first
reset. It then determines what the next reset should be.
We recommend no more than 2 (deg), though it can be a maximum of 4 (deg).
Chilled Water System Optimizer v2
Installation and Start-up Guide
76
Range
D:
Off
R:
Off/PAUSE
R:
OFF/ON
D:
30:00 (mm:ss)
R:
10:00 to 60:00 (mm:ss)
D:
Off
R:
Off/QUICK COOL
D:
1 (deg)
R:
0.5 to 2 (deg)
D:
1.25 (deg)
R:
0.7 to 2.0 (deg)
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