Table of Contents
Advertisement
Point Name/Description
Allow 50% of previous day's average reset as a first increment? — The program
keeps a running average of the previous day's reset values. This value can be used
as a first reset, which is closer to the optimal reset temperature for the most
efficient operation.
However, this calculated value is limited to 4°F. Even though the average
temperature of the most efficient operation is close to the same on subsequent
days, it may not always be the most efficient temperature at the beginning of the
day.
If set to ON, the program takes the highest of First Reset (configured above) or
Previous day's average reset.
Input Smoothing and System Response Time
Input Smoothing (0=min : 100=max):
This setting "smooths" the (kW/Ton) input and removes erratic signals.
This smoothing is more complex and subtle than most. It does not smooth the
signal excessively and it adjusts without shifting the output too much.
Input settings:
0 - no smoothing
1 - automatic minimal smoothing
Up to 100 (maximum smoothing or dampening)
System Response time in minutes (3=min to 30=max): __ minutes
Current interval time is: __minutes and __.__ seconds. — Displays values.
CAUTION Critical setting.
This setting defines the time it takes for the chilled water system to respond after
the optimization program resets the temperature. The program needs to know if the
system is using less energy after the setpoint has changed and after the system
has settled to the new setpoint.
The following must occur at the completion of one response time period:
Chiller supply temperature reaches the new setpoint temperature
Pumps reach their new speed in response to valves opening
Air handling unit valves open (or close) based on new chilled water temperature (if
applicable)
Air handler supply air temperature reaches steady state value
Air handling unit fan speeds up or slows down, due to supply air temperature
change (VAV systems)
The response time is difficult to approximate. You will need to initially monitor the
entire system to determine when the above conditions have been achieved. Start
with the 20 minute default value and adjust as required based on the actual
system response.
Chilled Water System Optimizer v2
Installation and Start-up Guide
Appendix B: The Chilled Water System Optimizer Commissioning view of the Properties page
77
Range
D:
Off
R:
Off/On
D:
50
R:
0 to 100
D:
15 minutes
R:
3 to 30 minutes
CARRIER CORPORATION ©2019
All rights reserved
Advertisement
Table of Contents
