Carrier 19DV Series Installation, Operation And Maintenance Instructions

Also see for AquaEdge 19DV series: Start-up, operation and maintenance instructions Start-up, operation and maintenance instructions Installation instructions Controls operation and troubleshooting Operation and Troubleshooting

Contents

Carrier 19DV Series Installation, Operation And Maintenance Instructions Manual pdf 11 page image

112.5 - Chiller familiarization 19DV2.5.1 - Chiller information plateThe chiller information plate is located in front of the electrical control box.2.5.2. System componentsThe main components include the cooler and condenser heat exchangers in separate vessels, motor-compressor, refrigerant, lubrication package, control panels, PIC5+ Touch Screen HMI, economizer, VFD, andpurge system.2.5.2.1. CoolerThis vessel is located underneath the compressor. The cooler is maintained at lower temperature/pressure soevaporating refrigerant can remove heat from water flowing through its internal tubes. Water is flowing through thetube internals to provide comfort or process cooling.2.5.2.2. CondenserThe condenser operates at a higher temperature/pressure than the cooler and has water flowing through itsinternal tubes in order to remove heat from the refrigerant. It contains a metering device that regulates the flow ofrefrigerant into the economizer.2.5.2.3. EconomizerThis chamber reduces the refrigerant pressure to an intermediate level between the evaporator and condenservessels. In the economizer, vapor is separated from the liquid, the separated vapor flows to the second stage ofthe compressor, and the liquid flows into the cooler.The energy removed from the vaporized refrigerant in the economizer allows the liquid refrigerant in the cooler toabsorb more heat when it evaporates and benefits the overall cooling efficiency cycle. It contains a float assemblythat regulates the flow of refrigerant into the evaporator.2.5.2.4. Motor-compressorThis component maintains system temperature and pressure differences and moves the heat-carrying refrigerantfrom the cooler to the condenser. The 19DV utilizes a two-stage back to back direct drive configuration.2.5.2.5. Purge unitA small independent condensing unit with compressor, separator, regenerative carbon filters heater and vacuumpump. The purge extracts gas from condenser (or from compressor if unit is not in operation) and purifies it byremoving non-condensable gases and any water vapor that may be present.2.5.2.6. Variable Frequency Drive (VFD)A variable-frequency drive allows start-up and compressor motor power supply interruption. It also allowsadjustment of the compressor speed based on the required capacity. It is either factory-installed in the unit in acabinet that also includes the protection and power transmission elements, or not unit-mounted.2.5.2.7. Refrigerant lubrication systemThis system provides lubrication to the compressor bearing by means of a refrigerant pump.2.5.2.8. Chiller control cabinetThis control panel includes the input and output boards (IOB), control transformer, relays, contactors, and circuitbreakers. It provides the power distribution and protection to the electrical components installed on chiller and hasthe following functions:• Communication with PIC5+ touch screen• Communication with purge panel• Communication with VFD• Sensor input and outputs• Actuators control• Refrigerant pump control2.5.2.9. Purge control panelThe purge panel includes the input and output board, control transformer, relays, and fuse. It provides the powerdistribution and protection to the electrical components which installed in the purge system and has the followingfunctions:• Communication with PIC5+ touch screen• Sensor input and outputs• Solenoid valve control