Figure 4: Liquid chiller log sheets
Note: These items can be printed by an electronic printer connected to the Microboard and
pressing the PRINT key on the keypad, or automatically using the Data Logger feature.
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.
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 operating range of 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.
6. Check the compressor discharge temperature on the System screen. During normal
operation discharge temperature does not exceed 220°F (104°C).
7. Check the compressor motor current on the System screen.
8. Check for any signs of dirty or fouled condenser tubes. The temperature difference between
water leaving condenser and saturated condensing temperature should not exceed the
difference recorded for a new unit by more than 4°F (2.2°C).
Weekly
• Check the refrigerant charge (see Checking the refrigerant charge during unit shutdown).
Model YK (Style H), R-134a and R-513A14
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