Operating Procedures
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1. Trending variables instantaneous values according to
cursor position. Current cursor timestamps are
displayed as well.
2. Text box to select viewing time span. It’s used for
zooming in on trends time axis. Options for selection:
3. Maximum and Minimum thresholds for trends
viewing. Used for zooming in on trends variables axis.
Both Maximum and Minimum thresholds are
adjustable via respective numeric boxes. Default Min /
Max values: –10.0 / 160.0. ‘Default Span’ button is used
to revert to defaults, so as to reset longitudinal
zooming.
4. “Scroll to Time” button is used to return to real time
viewing.
5. Cursor positioning buttons.
6. Buttons used to scroll back and forth in time. They
implement time axis trends pages scrolling.
7. Buttons used to scroll back and forth in time. High
resolution time axis scrolling.
8. Button is used to pause / resume real-time trending.
Operator Tasks
Before operating the unit, ensure that all compressor
refrigeration service valves are fully back-seated
counterclockwise.
Normal Power Up
The following procedure is used for a startup resulting
from scheduled seasonal or programmed cold shut down
of the chiller.
Important:
This start-up procedure is not to be used for
the first-time initial startup for a newly
installed chiller. See Preparation for Initial
Startup in the Installation section of this
manual for instructions regarding that
situation.
1. De-energize the chiller using standard lockout/tagout
procedures.
Figure 18.
Module trend screen
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is present
with a voltmeter.
