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

Also see for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR: User manual Start-up and service instructions Installation instructions Product data Installation instructions

Contents

Carrier 19XR Start-up, Operation And Maintenance Instructions Manual Manual pdf 36 page image

Table 4 — Capacity OverridesOVERRIDECAPACITY CONTROLFIRST STAGE SET POINT SECOND STAGESET POINT OVERRIDETERMINATIONView/Modifyon CVC Screen DefaultValue ConfigurableRange Value ValueHIGH CONDENSERPRESSURE SETUP1 125 psig(862 kPa) 90 to 165 psig(620 to 1138 kPa).OverrideSet Point+ 2.4 psid (16.5 kPad),OverrideSet PointHIGH MOTORTEMPERATURE SETUP1 .200 F(93.3 C) 150 to 200 F(66 to 93 C).OverrideSet Point+10° F (6° C),OverrideSet PointLOW REFRIGERANTTEMPERATURE(RefrigerantOverride DeltaTemperature)SETUP1 3° F (1.6° C) 2° to 5° F(1° to 3° C)<Trippoint+ OverrideDT –1° F (0.56° C).Trippoint+ OverrideDT +2° F (1.2° C)HIGH COMPRESSORLIFT(Surge Prevention) OPTIONSMin: T1 — 1.5° F(0.8° C)P1 — 50 psid(345 kPad)Max: T2 — 10° F(5.6° C)P2 — 85 psid(586 kPad)0.5° to 15° F(0.3° to 8.3° C)30 to 170 psid(207 to1172 kPad)0.5° to 15° F(0.3° to 8.3° C)50 to 170 psid(348 to 1172 kPad)None Within Lift LimitsPlus Surge/HGBPDeadband SettingMANUAL GUIDE VANETARGET CAPACITY Automatic 0 to 100% None Release ofManual ControlMOTOR LOAD —ACTIVE DEMAND LIMIT MAINSTAT 100% 40 to 100% >5% ofSet Point2% LowerThan Set PointLOW DISCHARGESUPERHEAT OVERRIDECalculated MinimumSuperheatfor ConditionsNone2° F (1.1° C)Below CalculatedMinimum Superheat1° F (0.56° C)Above CalculatedMinimum SuperheatOil Cooler — The oil must be cooled when the com-pressor is running. This is accomplished through a small,plate-type heat exchanger (also called the oil cooler) locatedbehind the oil pump. The heat exchanger uses liquid con-denser refrigerant as the cooling liquid. Refrigerant thermo-static expansion valves (TXVs) regulate refrigerant flow tocontrol the oil temperature entering the bearings. The bulbsfor the expansion valves are strapped to the oil supply lineleaving the heat exchanger, and the valves are set to main-tain 110 F (43 C).NOTE: The TXVs are not adjustable. The oil sump temper-ature 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 tostart and stop the chiller. However, the device should not beprogrammed to start and stop the chiller in excess of 2 or3 times every 12 hours. If more than 8 starts in 12 hours (theSTARTS IN 12 HOURS parameter on the MAINSTAT screen)occur, an excessive starts alarm displays, preventing the chillerfrom starting. The operator must press the RESET softkeyon the CVC to override the starts counter and start the chiller.If the chiller records 12 starts (excluding recycle starts) in asliding 12-hour period, it can be restarted only by pressingthe RESET softkey followed by the LOCAL or CCNsoftkey. This ensures that, if the automatic system is mal-functioning, the chiller will not repeatedly cycle on and off.If the automatic restart after a power failure option (AUTORESTART OPTION on the OPTIONS screen) is not acti-vated when a power failure occurs, and if the remote contactis closed, the chiller will indicate an alarm because of theloss of voltage.The contacts for remote start are wired into the starter atterminal strip J2, terminals 5 and 6 on the ISM. See the cer-tified drawings for further details on contact ratings. The con-tacts must have 24 vac rating.Spare Safety Inputs — Normally closed (NC) dis-crete inputs for additional field-supplied safeties may be wiredto the spare protective limits input channel in place of thefactory-installed jumper. (Wire multiple inputs in series.) Theopening of any contact will result in a safety shutdown anda display on the CVC. Refer to the certified drawings forsafety contact ratings.Analog temperature sensors may also be added to the mod-ule (SPARE TEMP #1 and #2). The analog temperature sen-sors may be configured to cause an alert or alarm on the CCNnetwork. The alert will not shut the chiller down. Config-uring for alarm state will cause the chiller to shut down.Spare Safety Alarm Contacts — One set of alarmcontacts is provided in the starter. The contact ratings areprovided in the certified drawings. The contacts are locatedon terminal strip JP, terminals 15 and 16.Refrigerant Leak Detector — An input is availableon the CCM module [terminal 15-5 (−) and J5-6 (+)] for arefrigerant leak detector. Enabling REFRIGERANT LEAKOPTION (OPTIONS screen) will allow the PIC II controlsto go into an alarm state at a user configured level(REFRIGERANT LEAK ALARM mA). The input is con-figured for 4 to 20 mA by setting the DIP switch 1 on SW2at the ON position, or configured for 0 to 5 vdc by settingswitch 1 at the OFF position. The output of the refrigerantleak detector is displayed as REFRIGERANT LEAK SEN-SOR on the MAINSTAT screen. For a 0 to 5 vcd input, 0 vdcinput represents 4 mA displayed and 5 vdc input represents20 mA displayed.Condenser Pump Control — The chiller will moni-tor the condenser pressure (CONDENSER PRESSURE) andmay turn on the condenser pump if the condenser pressurebecomes too high while the compressor is shut down. Thecondenser pressure override (COND PRESS OVERRIDE)parameter is used to determine this pressure point. CONDPRESS OVERRIDE is found in the SETUP1 display screen,which is accessed from the EQUIPMENT SERVICE table.The default value is 125 psig (862 kPa).If the CONDENSER PRESSURE is greater than or equalto the COND PRESS OVERRIDE, and the entering con-denser water temperature (ENTERING CONDENSERWATER) is less than 115 F (46 C), the condenser pump will36