Stopping the system
About this task:
To stop the chiller, proceed as follows:
1. Push the Soft Stop key on the home screen of the OptiView
™
panel if in LOCAL control or
send a stop command through the remote system if in REMOTE or BAS control. If the chiller
is in a remote control source and the local Soft Stop key is used to stop the chiller, the Start
key must be pressed before the chiller will again permit starts through the remote source. In
the event of an unusual circumstance requiring immediate stoppage, a safety stop switch is
located on the side of the control panel. Normal stop eases the driveline to stop and should
always be used instead of the safety stop during regular operation.
2. Stop the chilled water and/or condenser water pumps if not wired into the Microcomputer
Control Center, (in which case it will shut off automatically. The actual water pump contact
timing operation is dependent upon the selection on the SETUP screen.)
3. Open the switch to the cooling tower fan motors, if used.
Result
The OptiView
™
Control Center can be programmed to start and stop automatically (maximum -
once each day) whenever desired. 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 used an immediate stop occurs, which by passes the programmed controlled shutdown.
Operating logs
A permanent daily record of system operating conditions (temperatures and pressures) recorded at
regular intervals throughout each 24-hour operating period should be kept. Automatic data logging
is possible by connecting the optional printer and programming the DATA LOGGER function. An
optional status printer is available for this purpose. Figure 8 shows an example log sheet used by
Johnson Controls Personnel for recording test data on chiller systems. Log sheets are available in
pads of 50 sheets and may be obtained through the nearest Johnson Controls office.
23
YMC
2
Mod B with OptiView
™
Control Center
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