Start-Up And Commissioning; Network Points - Carrier OPN-OPT-OL Installation And Startup Manual

Start-up and Commissioning

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.
Chilled Water System Optimizer v2
Installation and Start-up Guide 31
Start-up and Commissioning
CARRIER CORPORATION ©2019
All rights reserved