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3. Remote Contacts/Ice Level Input — Compressor opera- tion terminates when the ICE BUILD TERMINATION parameter is set to 1 (CONTACTS) and the remote con- tacts are open and the ICE BUILD RECYCLE is set to DSABLE (0). In this case, the contacts provide ice level termination control. The contacts are used to stop the ice build function when a time period on the ice build sched- ule (OCCPC02S) is set for ice build operation. The re- mote contacts can still be opened and closed to start and stop the chiller when a specific time period on the ice build schedule is not set for ice build. 4. Entering Chilled Water Temperature and ICE BUILD Contacts — Compressor operation terminates when the ICE BUILD TERMINATION parameter is set to 2 (BOTH) and the conditions described above in items 2 and 3 for entering chilled water temperature and remote contacts have occurred. NOTE: It is not possible to override the CHILLER START/ STOP, CONTROL POINT, and ACTIVE DEMAND LIMIT variables from CCN devices (with a priority 4 or greater) dur- ing the ice build period. However, a CCN device can override these settings during 2-chiller lead/lag operation. RETURN TO NON-ICE BUILD OPERATIONS — The ice build function forces the chiller to start, even if all other sched- ules indicate that the chiller should stop. When the ice build function terminates, the chiller returns to normal temperature control and start/stop schedule operation. The CHILLER START/STOP and CONTROL POINT return to normal opera- tion. If the CHILLER START/STOP or CONTROL POINT has been forced (with a device of less than 4 priority) before the ice build function started, when the ice build function ends, the previous forces (of less than 4 priority) are not automatically restored. Attach to Network Device Control — The Service menu includes the ATTACH TO NETWORK DEVICE screen. From this screen, the operator can: • enter the time schedule number (if changed) for OCCPC03S, as defined in the NET_OPT screen • attach the CVC to any CCN device, if the chiller has been connected to a CCN network. This may include other PIC-controlled chillers. • upgrade software Figure 24 shows the ATTACH TO NETWORK DEVICE screen. The LOCAL parameter is always the CVC module ad- dress of the chiller on which it is mounted. Whenever the con- troller identification of the CVC changes, the change is reflect- ed automatically in the BUS and ADDRESS columns for the local device. See Fig. 18. Default address for local device is BUS 0 ADDRESS 1. When the ATTACH TO NETWORK DEVICE screen is ac- cessed, information can not be read from the CVC on any de- vice until one of the devices listed on that screen is attached. The CVC erases information about the module to which it was attached to make room for information on another device. Therefore, a CCN module must be attached when this screen is entered. Fig. 24 — Example of Attach to Network Device Screen To attach any CCN device, highlight it using the SELECT softkey and press the ATTACH softkey. The message “UP- LOADING TABLES, PLEASE WAIT” displays. The CVC then uploads the highlighted device or module. If the module address cannot be found, the message “COMMUNICATION FAILURE” appears. The CVC then reverts back to the AT- TACH TO DEVICE screen. Try another device or check the address of the device that would not attach. The upload process time for each CCN module is different. In general, the upload- ing process takes 1 to 2 minutes. Before leaving the ATTACH TO NETWORK DEVICE screen, select the local device. Oth- erwise, the CVC will be unable to display information on the local chiller. ATTACHING TO OTHER CCN MODULES — If the chill- er CVC has been connected to a CCN Network or other PIC controlled chillers through CCN wiring, the CVC can be used to view or change parameters on the other controllers. Other PIC II chillers can be viewed and set points changed (if the oth- er unit is in CCN control), if desired, from this particular CVC module. If the module number is not valid, the “COMMUNICA- TION FAILURE” message will show and a new address num- ber must be entered or the wiring checked. If the module is communicating properly, the “UPLOAD IN PROGRESS” message will flash and the new module can now be viewed. Whenever there is a question regarding which module on the CVC is currently being shown, check the device name de- scriptor on the upper left hand corner of the CVC screen. See Fig. 24. When the CCN device has been viewed, the ATTACH TO NETWORK DEVICE table should be used to attach to the PIC that is on the chiller. Move to the ATTACH TO NETWORK DEVICE table (LOCAL should be highlighted) and press the ATTACH softkey to upload the LOCAL device. The CVC for the 19XR will be uploaded and default screen will display. NOTE: The CVC will not automatically reattach to the local module on the chiller. Press the ATTACH softkey to attach to the LOCAL device and view the chiller operation. 44PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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