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

113 - CONTROLS3.1 - Definitions3.1.1 - Analogue signalAn analogue signal varies in proportion to the monitoredsource. It quantifies values between operating limits.(Example: A temperature sensor is an analogue devicebecause its resistance changes in proportion to thetemperature, generating many values.)3.1.2 - Discrete signalA discrete signal is a -position representation of the value ofa monitored source. (Example: A switch produces a discretesignal indicating whether a value is above or below a setpointor boundary by generating an on/off, high/low, or open/closed signal.)3.2 - GeneralThe 19XRV hermetic centrifugal liquid chiller contains amicroprocessor-based control panel that monitors andcontrols all operations of the chiller. The microprocessorcontrol system matches the cooling capacity of the chillerto the cooling load while providing state-of-the-art chillerprotection. The system controls the cooling load within thesetpoint plus the deadband by sensing the leaving chilledwater or brine temperature and regulating the inlet guidevane via a mechanically linked actuator motor. The guidevane is a variable flow pre-whirl assembly that controls therefrigeration effect in the cooler by regulating the amountof refrigerant vapour flow into the compressor. An increasein guide vane opening increases capacity. A decrease inguide vane opening decreases capacity. The microprocessor-based controls protect the chiller by monitoring the digitaland analogue inputs and executing capacity overrides orsafety shutdowns, if required.3.3 - PIC III system componentsThe chiller control system is called the PIC III (ProductIntegrated Control III). See Table 1. The PIC III controlsthe operation of the chiller by monitoring all operatingconditions. The PIC III can diagnose a problem and let theoperator know what the problem is and what to check. Itpromptly positions the guide vanes to maintain the leavingchilled water temperature. It can interface with auxiliaryequipment such as pumps and cooling tower fans to turnthem on when required. It continually checks all safeties toprevent any unsafe operating condition. It also regulatesthe oil heater while the compressor is off and regulates thehot gas bypass valve, if installed. The PIC III controls providecritical protection for the compressor motor and controlthe VFD. The PIC III can interface with the Carrier ComfortNetwork (CCN) system if desired. It can communicatewith other PIC I, PIC II, or PIC III equipped chillers andother CCN devices.The PIC III consists of three modules housed inside threemajor components. The component names and correspondingcontrol voltages are listed below (also see Table 1):• control panel- all extra low-voltage wiring (4 V or less)• power panel- 115 V a.c. control voltage (per job requirement)- 115 V a.c. power for oil heater and actuators- up to 460 V a.c. for oil pump power• VFD cabinet- chiller power wiring (per job requirement)Table 1 - Major PIC III components andpanel locationsPIC III component Panel locationInternational Chiller Visual Controller (ICVC) and Display Control PanelChiller Control Module (CCM) Control PanelControl Transformer Circuit Breakers CB1, CB2 Control PanelOil Heater Contactor (1C) Power PanelOil Pump Contactor (2C) Power PanelHot Gas Bypass Relay (3C) (Optional) Power PanelControl Transformers (T1, T2, T3) Power Panel3.3.1 - International Chiller Visual Controller (ICVC)The ICVC is the “brain” of the PIC III system. This modulecontains all the operating software needed to control thechiller. The ICVC is mounted to the control panel and isthe input centre for all local chiller set points, schedules,configurable functions, and options. The ICVC has a stopbutton, an alarm light, four buttons for logic inputs, and abacklight display. The backlight will automatically turn offafter 15 minutes of non-use. The functions of the four buttonsor “softkeys” are menu driven and are shown on the displaydirectly above the softkeys.The viewing angle of the ICVC can be adjusted for optimumviewing. Remove the bolts connecting the control panelto the brackets attached to the cooler. Place them in one ofthe holes to pivot the control panel forward to backwardto change the viewing angle. To change the contrast of thedisplay, access the adjustment on the back of the ICVC.The ICVC features four factory programmed languages:• English (default)• Chinese• Japanese• KoreanNOTE: Pressing any one of the four softkey buttons willactivate the backlight display without implementing asoftkey function.