General Conditions And Status - Carrier OPN-OPT-OL Installation And Startup Manual

Start-up and Commissioning
Control Output – Condenser Water Supply Setpoint Signal

Link the Analog Network Input in the tower program to the BACnet Analog Value Status in the optimization
program.
NOTE This is the condenser water supply setpoint signal that is read by the cooling tower program. The
condenser water setpoint is exposed as a BACnet Analog Value Status.

The tower program, in a separate controller, must retrieve the condenser water setpoint information. Verify
accuracy of the condenser water setpoint signal.

Obtain an approximation of the response time by locking the condenser water setpoint signal. See Optimized
Condenser Water Supply Setpoint AV (wetb + approach), under Condenser Water Temperature Optimizer
Reset (page 80) to set a condenser water setpoint value, and then verify response in the tower manager
program.

You may need to tune PID properties and tower ramp rates.
NOTE It is important that the condenser water setpoint be reset predictably and quickly enough for the
optimizer to work reliably. Good response is essential, though the actual response is still subject to the
system and engineering judgment.

General conditions and status

After you complete network point checkout, run a sequence checkout. The chiller plant must be on and running in
mechanical mode. The chillers and chilled water pumps must be running in order to check out the chilled water
optimization program.
After they have been running for a sufficient time to stabilize, expand Properties > General Conditions & Status
and verify the following:
Section 1 - Optimizer – Primary Enable Conditions (page 60)
Is the Main ON Switch Enabled?
1
Plant is ON when the 0.1 Plant ON binary network input is On, indicating chiller plant is running normally and
2
the number of operating chillers is correctly detected.
Chilled Water System Optimizer v2
Installation and Start-up Guide 32
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