Carrier AQUASNAP AIR COOLED CHILLERS WITH COMFORTLINK CONTROLS 30RAP010-060 Operation And Service Manual

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Carrier AQUASNAP AIR COOLED CHILLERS WITH COMFORTLINK CONTROLS 30RAP010-060 Operation And Service Manual Manual pdf 38 page image

38Table 22 — Dual Chiller Configuration (Master Chiller Example) (cont)NOTES:1. Master Control Method (CTRL) can be configured as 0-Switch, 2-Occupancy or 3-CCN.2. Parallel Configuration (PARA) cannot be changed.Dual chiller start/stop control is determined by configura-tion of Control Method (ConfigurationOPT1CTRL) ofthe Master chiller. The Slave chiller should always be config-ured for CTRL=0 (Switch). If the chillers are to be controlledby Remote Contacts, both Master and Slave chillers should beenabled together. Two separate relays or one relay withtwo sets of contacts may control the chillers. The Enable/Off/Remote Contact switch should be in the Remote Contactposition on both the Master and Slave chillers. The Enable/Off/Remote Contact switch should be in the Enable position forCTRL=2 (Occupancy) or CTRL=3 (CCN Control).Both chillers will stop if the Master chiller Enable/Off/Remote Contact switch is in the Off position. If the EmergencyStop switch is turned off or an alarm is generated on the Masterchiller the Slave chiller will operate in a Stand-Alone mode.If the Emergency Stop switch is turned off or an alarm isgenerated on the Slave chiller the Master chiller will operate ina Stand-Alone mode.The master chiller controls the slave chiller by changing itsControl Mode (Run StatusVIEWSTAT) and its operat-ing setpoint or Control Point (Run StatusVIEWCT.PT).Temperature Reset — The control system is capable ofhandling leaving-fluid temperature reset based on return coolerfluid temperature. Because the change in temperature throughthe cooler is a measure of the building load, the return tempera-ture reset is in effect an average building load reset method.The control system is also capable of temperature reset basedon outdoor-air temperature (OAT), space temperature (SPT), orfrom an externally powered 4 to 20 mA signal. Accessory sen-sors must be used for SPT reset (33ZCT55SPT). The energymanagement module (EMM) must be used for temperaturereset using a 4 to 20 mA signal. See Tables 24 and 25.SUB-MODE ITEM KEYPAD ENTRY DISPLAY ITEM EXPANSION COMMENTSRSETLLBL 2 LEAD/LAG BALANCE SELECT CHANGE ACCEPTEDLLBLLLBD LEAD/LAG BALANCE DELTALLBD 168 LEAD/LAG BALANCE DELTA DEFAULT 168LLBDLLDY LAG START DELAYLLDY 5 SCROLLING STOPS5 VALUE FLASHES10 SELECT 10LLDY 10 LAG START DELAY CHANGE ACCEPTEDLLDYRSETPARA YES MASTER COMPLETEENTERESCAPEENTERESCAPEENTERENTERENTERESCAPEESCAPEENTERMASTERCHILLERSLAVECHILLERLEAVINGFLUIDRETURNFLUIDTHERMISTORWIRING*INSTALL DUAL CHILLER LWTLEAVING FLUID TEMPERATURETHERMISTOR (T10) HERE*Depending on piping sizes, use either:• HH79NZ014 sensor/10HB50106801 well (3-in. sensor/well)• HH79NZ029 sensor/10HB50106802 well (4-in. sensor/well)Fig. 16 — Dual Chiller Thermistor LocationAB1/4 N.P.T.0.505/0.4950.61DIA6” MINIMUMCLEARANCE FORTHERMISTORREMOVALFig. 17 — Dual Leaving Water Thermistor WellPARTNUMBERDIMENSIONS in. (mm)A B10HB50106801 3.10 (78.7) 1.55 (39.4)10HB50106802 4.10 (104.1) 1.28 (32.5)