Carrier 19XRV Start-up, Operation And Maintenance Instructions Manual

Also see for AquaEdge 19XRV series: Start-up, operation and maintenance instructions Start-up and service instructions Installation instructions Start-up, operation and maintenance instructions Start-up and service instructions

Contents

50NOTE: The Ice Build steps do not occur if the chiller is config-ured and operating as a lag or standby chiller for lead/lagoperation and is actively being controlled by a lead chiller. Thelead chiller communicates the ICE BUILD SET POINT, thedesired CHILLER START/STOP state, and the ACTIVEDEMAND LIMIT to the lag or standby chiller as required forice build, if configured to do so.START-UP/RECYCLE OPERATION — If the chiller is notrunning when ice build activates, the PIC III checks the fol-lowing conditions, based on the ICE BUILD TERMINATIONvalue, to avoid starting the compressor unnecessarily:• if ICE BUILD TERMINATION is set to the TEMP optionand the ENTERING CHILLED WATER temperature isless than or equal to the ICE BUILD SETPOINT;• if ICE BUILD TERMINATION is set to the CONTACTSoption and the ICE BUILD CONTACT is open;• if the ICE BUILD TERMINATION is set to the BOTH(temperature and contacts) option and the ENTERINGCHILLED WATER temperature is less than or equalto the ICE BUILD SETPOINT and the ICE BUILDCONTACT is open.The ICE BUILD RECYCLE on the OPTIONS screendetermines whether or not the chiller will go into an ice buildRECYCLE mode.• If the ICE BUILD RECYCLE is set to DSABLE (disable),the PIC III reverts to normal (non-ice build) temperaturecontrol when the ice build function is terminated bysatisfying one of the above conditions. Once ice build isterminated in this manner, it will not be reinitiated untilthe next ice build schedule period begins.• If the ICE BUILD RECYCLE is set to ENABLE, the PICIII goes into an ICE BUILD RECYCLE mode, and thechilled water pump relay remains energized to keep thechilled water flowing when the compressor shuts down.If the temperature of the LEAVING CHILLED WATERlater increases above the ICE BUILD SETPOINT plushalf the RECYCLE RESTART DELTA T value, thecompressor restarts, controlling the chilled water/brinetemperature to the ICE BUILD SETPOINT.TEMPERATURE CONTROL DURING ICE BUILD —During ice build, the capacity control algorithm shall use theCONTROL POINT minus 5 F (–2.8 C) for control ofthe LEAVING CHILLED WATER temperature. The ECWCONTROL OPTION and any temperature reset option shall beignored, if enabled, during ice build. Also, the followingcontrol options will be ignored during ice build operation:• ECW CONTROL OPTION and any temperature resetoptions (configured on TEMP_CTL screen).• 20 mA DEMAND LIMIT OPT (configured onRAMP_DEM screen).TERMINATION OF ICE BUILD — The ice build functionterminates under the following conditions:1. Time Schedule — When the current time on the ice buildtime schedule (OCCPC02S) is not set as an ice build timeperiod.2. Entering Chilled Water Temperature — Ice build opera-tion terminates, based on temperature, if the ICE BUILDTERMINATION parameter is set to 0 (TEMP), theENTERING CHILLED WATER temperature is lessthan the ICE BUILD SETPOINT, and the ICE BUILDRECYCLE is set to DSABLE. If the ICE BUILDRECYCLE OPTION is set to ENABLE, a recycleshutdown occurs and recycle start-up depends onthe LEAVING CHILLED WATER temperature beinggreater than the water/brine CONTROL POINT plus theRESTART DELTA T temperature.3. Remote Contacts/Ice Level Input — Ice build operationterminates when the ICE BUILD TERMINATION param-eter is set to 1 (CONTACTS) and the ICE BUILDCONTACTS are open and the ICE BUILD RECYCLE isset to DSABLE (0). In this case, the ICE BUILDCONTACTS provide ice level termination control. Thecontacts are used to stop the ice build function when atime period on the ice build schedule (OCCPC02S) is setfor ice build operation. The remote contacts can still beopened and closed to start and stop the chiller when aspecific time period on the ice build schedule is not set forice build.4. Entering Chilled Water Temperature and ICE BUILDContacts — Ice Build operation terminates when the ICEBUILD TERMINATION parameter is set to 2 (BOTH)and the conditions described above in items 2 and 3 forENTERING CHILLED WATER temperature and ICEBUILD CONTACTS have occurred.NOTE: It is not possible to override the CHILLER START/STOP, CONTROL POINT, and ACTIVE DEMAND LIMITvariables from CCN devices (with a priority 4 or greater)during the ice build period. However, a CCN device canoverride these settings during 2-chiller lead/lag operation.RETURN TO NON-ICE BUILD OPERATIONS — The icebuild function forces the chiller to start, even if all other sched-ules indicate that the chiller should stop. When the ice buildfunction terminates, the chiller returns to normal temperaturecontrol and start/stop schedule operation. The CHILLER START/STOP and CONTROL POINT return to normal operation. If theCHILLER START/STOP or CONTROL POINT has been forced(with a device of less than 4 priority) before the ice build func-tion 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 Servicemenu includes the ATTACH TO NETWORK DEVICEscreen. From this screen, the operator can:• enter the time schedule number (if changed) forOCCPC03S, as defined in the NET_OPT screen• attach the ICVC to any CCN device, if the chiller hasbeen connected to a CCN network. This may includeother PIC-controlled chillers.• upgrade softwareFigure 25 shows the ATTACH TO NETWORK DEVICEscreen. The LOCAL parameter is always the ICVC moduleaddress of the chiller on which it is mounted. Whenever thecontroller identification of the ICVC changes, the change isreflected automatically in the BUS and ADDRESS columnsfor the local device. See Fig. 18. Default address for localdevice is BUS 0 ADDRESS 1.When the ATTACH TO NETWORK DEVICE screen isaccessed, information can not be read from the ICVC on anydevice until one of the devices listed on that screen is attached.The ICVC erases information about the module to which it wasattached to make room for information on another device.Therefore, a CCN module must be attached when this screen isentered.To attach any CCN device, highlight it using thesoftkey and press the softkey. The message“UPLOADING TABLES, PLEASE WAIT” displays. TheICVC then uploads the highlighted device or module. Ifthe module address cannot be found, the message “COMMU-NICATION FAILURE” appears. The ICVC then reverts backto the ATTACH TO DEVICE screen. Try another device orcheck the address of the device that would not attach. Theupload process time for each CCN module is different. Ingeneral, the uploading process takes 1 to 2 minutes. Beforeleaving the ATTACH TO NETWORK DEVICE screen, selectthe LOCAL device. Otherwise, the ICVC will be unable todisplay information on the local chiller.SELECTATTACH