Operator setpoints quick reference
The most common operator level setpoints can be found on the setpoints screen or the following
screens:
Table 11: Common setpoint locations
Setpoint Screen
Leaving chilled liquid temperature Evaporator or Setpoints
Shutdown temperature offset Evaporator or Setpoints
Restart temperature offset Evaporator or Setpoints
Local input current limit Setpoints
Pulldown demand limit Setpoints
Pulldown demand time Setpoints
Control source Setpoints > Remote Control
Stopping the system
To stop the chiller, complete the following steps:
1. Choose the appropriate method depending on the control source:
• If in Local control, press the soft Stop button on the Home screen of the OptiView panel.
• If in remote or BAS control, send a stop command through the remote system.
• If the chiller is in a remote-control source and the local soft Stop button is used to stop
the chiller, the Start button must be pressed before the chiller can again permit starts
through the remote source.
• If an unusual circumstance requires immediate stoppage, a safety stop switch is located
on the side of the control panel. Normal stop eases the driveline to stop and must always
be used instead of the safety stop during regular operation.
2. Stop the chilled water pumps if they are not wired into the microcomputer control center,
in which case it shuts off automatically. The actual water pump contact timing operation
depends on the selection on the setup screen.
3. You can program the OptiView Control Center to start and stop automatically once each day
whenever required. See Schedule screen in OptiView Control Center functions and navigation.
Safety stop
When depressed, the chiller will not run under any condition. For safety reasons, this position is
required for many maintenance tasks to be completed. The safety stop button must be rotated
clockwise to release the stop condition. The safety stop is not intended for normal shutdown of
the chiller. If it is used, an immediate stop occurs, which bypasses the programmed controlled
shutdown.
Operating logs
A permanent daily record of system operating conditions recorded at regular intervals throughout
each 24-hour operating period must be kept. This is done automatically when a data logging SD
card (031-0381-000) is installed in the microboard. This comes installed from the factory. It should
only be removed to copy the data to another device or to update software, after which it must be
re-installed.
Automatic data logging is also possible by connecting the optional printer and programming the
data logging function. An optional status printer is available for this purpose. Figure 14 shows an
example log sheet used by Johnson Controls Personnel for recording test data on chiller systems.
YVAM with OptiView Control Center34
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