Carrier 17EX Start-up, Operation And Maintenance Instructions Manual

Also see for 17EX Series: Start up & operation manual Start-up, operation and maintenance instructions

Contents

PIC System Components — The Product IntegratedControl (PIC) is the control system on the chiller. SeeTable 1. The PIC controls the operation of the chiller by moni-toring all operating conditions. The PIC can diagnose a prob-lem and let the operator know what the problem is and whatto check. It promptly positions the guide vanes to maintainleaving chilled water temperature. It can interface with aux-iliary equipment such as pumps and cooling tower fans toturn them on only when required. It continually checks allsafeties to prevent any unsafe operating condition. It alsoregulates the oil heater while the compressor is off and thehot gas bypass valve, if installed. See Fig. 6-10 for the lo-cations of sensors, transducers, and other devices controlledand/or monitored by the PIC system.The PIC can be interfaced with the Carrier ComfortNetwork (CCN) if desired. It can communicate with otherPIC-equipped chillers and other CCN devices.The PIC consists of 4 modules housed inside one of 3 lo-cations: the control center, the power panel, or the startercabinet. The component names and the control voltage ofeach location are listed below (also see Table 1):• control center— all extra low-voltage wiring (24 v or less)• power panel— 115 v control voltage— up to 600 v for oil pump power• starter cabinet— chiller power wiring (per job requirement)Table 1 — Major PIC Components andPanel Locations*PIC COMPONENT PANELLOCATIONProcessor Sensor Input/Output Module(PSIO) Control CenterStarter Management Module (SMM) Starter CabinetLocal Interface Device (LID) Control Center6-Pack Relay Board Control Center8-Input Modules (Optional) Control Center4-In/2-Out Module Power PanelOil Differential Pressure/Power SupplyModule Control CenterOil Heater Contactor (1C) Power PanelCompressor Oil Pump Contactor (2C) Power PanelGear Oil Pump Contactor (5C) Power PanelHot Gas Bypass Relay (3C) (Optional) Power PanelControl Transformers (T1-T4) Power PanelControl and Oil Heater Voltage Selector (S1) Power PanelTemperature Sensors See Fig. 7Pressure Transducers See Fig. 7*See Fig. 6-10.LEGEND1 — Gear Oil Pressure Sensor2 — Thrust Bearing Temperature andImpeller Displacement Cable3 — Discharge Temperature Sensor4 — Guide Vane Conduit and Cable5 — High Pressure Cutout Switch6 — Compressor Oil CoolerSolenoid Conduit7 — Oil Heater Conduit8 — Motor Space Heater Conduit9 — Gear Oil Temperature Sensor10 — Motor High Temperature Switch CableFig. 6 — 17EX Controls and Sensor LocationsREAR11 — Motor Water Cooling Leak DetectorCable (TEWAC Motor Only)12 — Discharge Oil Pressure SensorTEWAC — Totally Enclosed Water-to-Air Cooled12