Carrier AQUAFORCE 30XA080-500 Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for AQUAFORCE 30XA080: Installation instructions Controls, start-up, operation, service and troubleshooting instructions Installation instructions Product data

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Carrier AQUAFORCE 30XA080-500 Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 32 page image

32To configure this option with the Touch Pilot display:To configure this option with the Navigator display:CIRCUIT/COMPRESSOR LOADING — The control canbe configured to stage the circuit/compressors. The LoadingSequence Select (Circuit Loading Sequence, LOAD) settingdetermines how the control will perform loading. The configu-ration can be set to Equal or Staged.Equal Loading — With Equal loading, the circuit which startsfirst will maintain the minimum stage of capacity with the slidevalve fully unloaded. When additional capacity is required, thenext circuit with the lowest compressor wear factor is startedwith its slide valve at minimum position. As additional capaci-ty is required, the slide valve for a circuit will be adjusted inapproximately 5% increments to match capacity requirements.The control will alternate between circuits to maintain the samepercentage of capacity on each circuit. See Fig. 21.Staged Loading — If staged loading is selected, the circuitwhich starts first will gradually load its slide valve to matchcapacity requirements until the circuit is fully loaded. Once thecircuit is fully loaded and additional capacity is required, thecontrol will start an additional circuit fully unloaded. The con-trol will gradually unload the circuit which was fully loaded tomatch capacity requirements. See Fig. 21.To configure this option with the Touch Pilot™ display:To configure this option with the Navigator™ display:Minimum Load Control — Minimum Load Controlcan be a factory-installed option or a field-installed accessory.If installed, and its operation is desired, the Minimum LoadControl must be enabled. Once enabled, the valve will be oper-ational only during the first stage of cooling.To configure this option with the Touch Pilot display:To configure this option with the Navigator display:Dual Chiller Control — The dual chiller routine isavailable for the control of two units installed in series or paral-lel supplying chilled fluid on a common loop. One chiller mustbe configured as the master chiller, the other as the slave chill-er. An additional leaving fluid temperature thermistor (DualChiller LWT) must be installed in the common chilled waterpiping as described in the Installation Instructions for both themaster and slave chillers. See the Field Wiring section in the30XA Installation Instructions for Dual Chiller LWT sensorcontrol wiring.The control algorithm relies on several parameters that mustbe field configured for operation. Both chillers must be on thesame Carrier Comfort Network® bus with different addresses.On both chillers, Master/Slave Select (Master/Slave Select,MSSL) must be enabled. The water piping arrangement, Chill-ers in Series (Chiller in Series, SERI), must be configured.The master chiller must be programmed with the Slave ChillerAddress (Slave Address, SLVA). Additional optional pro-gramming parameters may be configured to meet applicationrequirements.Lead/Lag Balance Select (Lead Lag Select, LLBL) deter-mines which chiller is the lead machine. The options are Al-ways Lead, Lag if Fail, and Runtime Select. Under RuntimeSelect control, the lead chiller will change based on the time in-crement selected in the Lead/Lag Balance Delta configuration(Lead/Lag Balance Data, LLBD). If the run hour differencebetween the master and the slave remains less than the Lead/Lag Balance Delta, the chiller designated as the lead willremain the lead chiller. The Lead/Lag changeover between themaster and the slave chiller due to hour balance will occur dur-ing chiller operating odd days, such as day 1, day 3, and day 5of the month, at 12:00 a.m. If a lead chiller is not designated,the master chiller will always be designated the lead chiller.The dual chiller control algorithm has the ability to delaythe start of the lag chiller in two ways. The Lead PulldownTime parameter (Lead Pulldown Type, LPUL) is a one-timetime delay initiated after starting the lead chiller, before check-ing whether to start an additional chiller. This time delay givesthe lead chiller a chance to remove the heat that the chilledwater loop picked up while being inactive during an unoccu-pied period. The second time delay, Lead/Lag Delay (LagStart Timer, LLDY) is a time delay imposed between the laststage of the lead chiller and the start of the lag chiller. This pre-vents enabling the lag chiller until the lead/lag delay timer hasexpired.A quicker start of the lag chiller can be accomplished byconfiguring the Start if Error Higher parameter (Start if ErrorHigher, LL.ER). If the difference between the common leav-ing water temperature and the set point is greater than the con-figured value, then the lag chiller will start.A minimum on time for the lag chiller can be programmedwith the Lag Minimum Running Time configuration (LagMinimum Running Time, LAG.M). This parameter causesthe control to run the lag chiller for the programmed minimumon time. The Lag Unit Pump Select (Lag Unit Pump Control,LAGP) can be configured such that the pump can be on or offwhile the chiller is off. This parameter is only active in ParallelChiller Operation.DISPLAY NAME PATH LINENO. VALUECircuit LoadingSequenceMain MenuConfigUSER 10 (Automatic Lead-lag)1 (Circuit A Leads)2 (Circuit B Leads)3 (Circuit C Leads)Default = 0(Automatic Lead-lag)ITEM ITEM EXPANSION PATH VALUELLCS Lead/LagCircuit SelectConfigurationOPTNRange: Automatic,Cir A Leads,Cir B Leads,Cir C LeadsDefault – AutomaticDISPLAY NAME PATH LINENO. VALUEStaged LoadingSequenceMainMenuConfigUSER 4Default = NoNo (Equal)Yes (Staged)ITEM ITEM EXPANSION PATH VALUELOAD Loading SequenceSelect ConfigurationOPTNDefault = EqualEqualStagedDISPLAY NAME PATH LINENO. VALUEHot GasBypass SelectMainMenuServiceFACTORY14Default = NoNo (No MinimumLoad Control)Yes (Minimum LoadControl Installed)ITEM ITEMEXPANSION PATH VALUEHGBP Hot GasBypass Select ConfigurationUNITNo = No MinimumLoad ControlYes = Minimum LoadControl Installed