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TRANSDUCER REPLACEMENT — Since the transducers are mounted on Schrader-type fittings, there is no need to re- move refrigerant from the vessel when replacing the transduc- ers. Disconnect the transducer wiring by pulling up on the locking tab while pulling up on the weather-tight connecting plug from the end of the transducer. Do not pull on the trans- ducer wires. Unscrew the transducer from the Schrader fitting. When installing a new transducer, do not use pipe sealer (which can plug the sensor). Put the plug connector back on the sensor and snap into place. Check for refrigerant leaks. Control Algorithms Checkout Procedure — One of the tables on the CVC SERVICE menu is CONTROL ALGORITHM STATUS. The maintenance screens may be viewed from the CONTROL ALGORITHM STATUS table to see how a particular control algorithm is operating. These maintenance screens are very useful in helping to de- termine how the control temperature is calculated and guide vane positioned and for observing the reactions from load changes, control point overrides, hot gas bypass, surge preven- tion, etc. The tables are: Control Test — The Control Test feature can check all the thermistor temperature sensors, pressure transducers, pumps and their associated flow devices, the guide vane actuator, and other control outputs such as hot gas bypass. The tests can help to determine whether a switch is defective or a pump relay is not operating, as well as other useful troubleshooting issues. During pumpdown operations, the pumps are energized to pre- vent freeze-up and the vessel pressures and temperatures are displayed. The Pumpdown/Lockout feature prevents compres- sor start-up when there is no refrigerant in the chiller or if the vessels are isolated. The Terminate Lockout feature ends the Pumpdown/Lockout after the pumpdown procedure is reversed and refrigerant is added. LEGEND TO TABLES 11A-11J Be sure to use a back-up wrench on the Schrader fitting whenever removing a transducer, since the Schrader fitting may back out with the transducer, causing a large leak and possible injury to personnel. CCM — CVC — CHW — ISM — PIC II — VFD — Chiller Control Module Chiller Visual Controller Chilled Water Integrated Starter Module Product Integrated Controls II Variable Frequency Drive Capacity Control Override Status Surge/ HGBP Status LEAD/LAG Status Time Schedules Status Water System Manager Status CAPACITY OVERRIDE HEAT_EX LL_MAINT OCCDEFCM WSMDEFME This table shows all values used to calculate the chilled water/ brine control point. Details of all chilled water con- trol override values. The surge and hot gas bypass control algorithm status is viewed from this screen. All values dealing with this control are displayed. Indicates LEAD/LAG operation status. The Local and CCN occupied schedules are displayed here to help the operator quickly deter- mine whether the schedule is in the “occupied” mode or not. The water system manager is a CCN module that can turn on the chiller and change the chilled water control point. This screen indicates the status of this system. 77PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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