An optional status printer is available for this purpose. Alternatively, Figure 8 shows a log sheet
used by Johnson Controls Personnel for recording test data on chiller systems. It is available from
the factory in pads of 50 sheets each under
Form 160.44-F6
and can be obtained through the
nearest Johnson Controls office. Automatic data logging is possible by connecting the optional
printer and programming the DATA LOGGER function.
An accurate record of readings serves as a valuable reference for operating the system. Readings
taken when a system is newly installed establish normal conditions with which to compare later
readings.
For example, an increase in condenser approach temperature (condenser temperature minus
leaving condenser water temperature) can be an indication of dirty condenser tubes.
Operating inspections
By following a regular inspection using the display readings of the Microcomputer Control Center,
and maintenance procedure, the operator can avoid serious operating difficulty. The following list
of inspections and procedures should be used as a guide.
Figure 8: Liquid chiller log sheets
Note:
These items can be printed by an electronic printer connected to the Microboard and
pressing the
key on the keypad, or automatically using the Data Logger feature.
Daily
1. Check OptiView™ control center displays.
2. If the compressor is in operation, check the bearing oil pressure on the System Screen. Also
check the oil level in the oil reservoir. Operating oil level should be within operating range of
the oil indicator. Drain or add oil if necessary.
3. Check entering and leaving condenser water pressure and temperatures for comparison with
job design conditions. Condenser water temperatures can be checked on the System Screen.
4. Check the entering and leaving chilled liquid temperatures and evaporator pressure for
comparison with job design conditions on the System Screen.
5. Check the condenser saturation temperature (based upon condenser pressure sensed by the
condenser transducer) on the System Screen.
Model YK Style G R-134a or R-513A
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