Carrier AquaEdge 19XR series Start-up, Operation And Maintenance Instructions Manual

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

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Carrier AquaEdge 19XR series Start-up, Operation And Maintenance Instructions Manual Manual pdf 54 page image

54The oil heater is always off during start-up or when thecompressor is running.The oil pump is also energized during the time the oil is be-ing heated (for 30 seconds at the end of every 30 minutes).The oil pump will not operate if the EVAPORATOR PRES-SURE is less than –5 psig (–34.5 kPa).Oil Cooler — The oil must be cooled when the compres-sor is running. This is accomplished through a small, plate-typeheat exchanger (also called the oil cooler) located behind theoil pump. The heat exchanger uses liquid condenser refrigerantas the cooling liquid. Refrigerant thermostatic expansionvalves (TXVs) regulate refrigerant flow to control the oil tem-perature entering the bearings. The bulbs for the expansionvalves are strapped to the oil supply line leaving the heat ex-changer, and the valves are set to maintain 110 F (43 C).NOTE: The TXVs are not adjustable. The oil sump tempera-ture may be at a lower temperature during compressoroperations.Remote Start/Stop Controls — A remote device, suchas a timeclock that uses a set of contacts, may be used to startand stop the chiller. However, the device should not be pro-grammed to start and stop the chiller in excess of 2 or 3 timesevery 12 hours. If more than 8 starts in 12 hours (the STARTSIN 12 HOURS parameter on the MAINSTAT screen) occur, anexcessive starts alarm displays, preventing the chiller fromstarting. The operator must press the softkey on theICVC to override the starts counter and start the chiller. Thisensures that, if the automatic system is malfunctioning, thechiller will not repeatedly cycle on and off.If the REMOTE START OPTION is enabled, the remotestart contacts must be closed for the AUTO RESTART OPTION(if enabled) to restart the chiller following a power failure.Also, if the number of recycle shutdowns in a 4-hour periodexceeds five, then alert message 152 is displayed (and loggedinto ALERT HISTORY) until the next required startup.The contacts for remote start are wired into the starter at ter-minal strip J2, terminals 5 and 6 on the ISM. See the certifieddrawings for further details on contact ratings. The contactsmust have 24 vac dry contact rating.Spare Safety and Spare TemperatureInputs — Normally closed (NC) discrete inputs for addi-tional field-supplied safeties may be wired to the spare protec-tive limits input channel in place of the factory-installed jump-er. (Wire multiple inputs in series.) The opening of any contactwill result in a safety shutdown and a display on the ICVC. Re-fer to the certified drawings for safety contact ratings.Extra analog temperature sensors may also be added to theCCM module (SPARE TEMPERATURE #1 and SPARE TEM-PERATURE #2) at terminals J4 25-26 and J4 27-28, respec-tively. The analog temperature sensors may be configured inthe EQUIPMENT SERVICE/SETUP1 table to cause anALERT (Enable value 1 or 2) or ALARM (Enable value 3 or4), or neither (Enable value 0). An alarm will shut down a run-ning chiller, but an alert will not. The fault condition will betriggered when crossing a high limit (Enable value 2 or 4) orlow limit (Enable value 1 or 3), configurable between –40 F to245 F (–40 C to 118 C). The spare temperature sensors arereadable on the CCN network. They also have specific uses ascommon temperature sensors in a Lead/Lag system. See Ap-pendix B.Alarm (Trip) Output Contacts — One set of alarmcontacts is provided in the starter. The contact ratings are pro-vided in the certified drawings. The contacts are located onISM terminal strip J9, terminals 15 and 16.Refrigerant Leak Detector — An input is availableon the CCM module [terminal J5-5 (–) and J5-6 (+)] for arefrigerant leak detector. Enabling REFRIGERANT LEAK OP-TION (OPTIONS screen) will allow the PIC II controls to gointo an alarm state at a user configured level (REFRIGERANTLEAK ALARM mA). The input is configured for 4 to 20 mA bysetting the DIP switch 1 on SW2 at the ON position, or config-ured for 1 to 5 vdc by setting switch 1 at the OFF position. Theoutput of the refrigerant leak detector is displayed as REFRIG-ERANT LEAK SENSOR on the MAINSTAT screen. For a 1 to5 vdc input, 1 vdc input represents 4 mA displayed and 5 vdcinput represents 20 mA displayed.Kilowatt Output — An output is available on the CCMmodule [Terminal J8-1 (+) and J8-2 (–)] to represent the powerconsumption of the chiller if a constant speed starter is used.The 4 to 20 mA signal generated by the CCM module can bewired to the building automation or energy management sys-tem to monitor the chiller’s energy consumption. The output is2 mA with the chiller off. The signal varies linearly from 4 mA(representing 0% rated kilowatt consumption) to 20 mA (repre-senting 100% rated kilowatt consumption). The rated peakkilowatt consumption is configured by the user in theRAMP_DEM display screen by the setting the MOTOR RAT-ED KILOWATTS from the job data sheet.Remote Reset of Alarms — A standard feature of thePIC II controls is the ability to reset a chiller in a shutdownalarm state from a remote location. If the condition whichcaused the alarm has cleared the chiller can be placed back intoa normal CCN operating mode when the REMOTE RESETOPTION (ICVC_PSWD menu) is set to ENABLE. A varietyof Carrier Comfort Network® software systems includingComfortVIEW™ or Network Service Tool™ can access thePIC II controls and reset the displayed alarm. Third party soft-ware from building automation systems (BAS) or energy man-agement systems (EMS) can also access the PIC II controlsthrough a UPC module and reset the fault displayed. Bothmethods would access the ICVC_PSWD screen and force theRESET ALARM? point to YES to reset the fault condition. Ifthe PIC II controls have determined that is safe to start thechiller the CCN MODE? point (ICVC_PSWD screen) can beforced to YES to place the chiller back into normal CCN oper-ating mode. The only exceptions are the following alarms thatcannot be reset from a remote location: STATE numbers 100,205, 217-220, 223, 233, 234, 247, and 250. To view alarmcodes, refer to Troubleshooting Guide, Checking Display Mes-sages, page 99. After the alarm has been reset the PIC II controlwill increment the Starts in 12 Hours counter by one upon re-start. If the limit of 8 starts in a 12-hour period occurs, thealarm (Alert State 100) will be required to be reset at the chillercontrol panel (ICVC).Condenser Pump Control — The chiller will moni-tor the condenser pressure (CONDENSER PRESSURE) andmay turn on the condenser pump if the condenser pressure be-comes too high while the compressor is shut down. The con-denser pressure override (COND PRESS OVERRIDE) parame-ter is used to determine this pressure point. COND PRESSOVERRIDE is found in the SETUP1 display screen, which isaccessed from the EQUIPMENT SERVICE table. The defaultvalue is 125 psig (862 kPa).If the CONDENSER PRESSURE is greater than or equal tothe COND PRESS OVERRIDE, and the entering condenserwater temperature (ENTERING CONDENSER WATER) is lessthan 115 F (46 C), the condenser pump will energize to try todecrease the pressure and alert 151 will be generated. Thepump will turn off when the condenser pressure is 3.5 psi(24.1 kPa) less than the pressure override or when the condens-er refrigerant temperature (CONDENSER REFRIG TEMP) iswithin 3 F (1.7 C) of the entering condenser water tempera-ture (ENTERING CONDENSER WATER).RESET