Start-up and Commissioning
Chilled Water System Optimizer v2
CARRIER CORPORATION ©2019
Installation and Start-up Guide
31
All rights reserved
The chilled water system optimization program gathers input values over the network, applies logic, and then
outputs a chilled water temperature reset and a condenser water temperature setpoint. The new setpoints are
designed to lower the chiller lift to save energy, while balancing it with increased energy consumed by the pumps
and tower fans.
NOTE
The program does not support any hardware points.
Network Points
Network Inputs
On the
Properties
page >
Network Points
tab:
Verify that all input connections are linked, valid, and error-free.
Set all remote inputs as
Network Visible
.
Set all network input refresh times to low polling rates or to COV (change of value). If the response times are
too slow, the program may lag in its calculations.
We recommend you use kW instead of amperage whenever possible. If the equipment power is in amperage,
use the appropriate formula based on voltage, phase, and power factor inputs.
The links to each
Chiller ON
BNI2 should indicate the actual chiller status, from either the chiller manager or
the chiller program, to determine when the chiller is actually running.
Control Output – Chilled Water Supply Setpoint Value
Link the Analog Network Input in the chiller program to the BACnet Analog Value Status in the optimization
program.
NOTE
The chilled water supply setpoint signal is read and used by the chiller program. The Chilled Water
Setpoint Value in the optimization program is exposed as a BACnet Analog Value Status.
The chiller program, which is located in a separate controller, must retrieve the
Chilled Water Supply Setpoint
Value
information. The program managing the chiller operation must verify the accuracy and integrity of the
received chilled water supply setpoint value.
Each chiller must have setpoint adjustment available, enabled, and working on each chiller.
Obtain an approximation of the setpoint adjust response time by locking the optimization chilled water
setpoint signal
Optimized Chilled Water Supply Setpoint AV
, under Chilled Water Temperature Optimizer
Reset to a 40 to 50°F reset value, and then verify response in the chiller manager program and each
controlled chiller.
Each operating chiller should recognize the signal and respond to find the new setpoint.
You may need to tune the chiller program properties and chiller setpoint ramp rates to get proper response.
NOTE
It is important that the chilled water setpoint be reset predictably and quickly enough for the optimizer
to work reliably. Good response is essential and the actual response is subject to the system limits.
Start-up and Commissioning
