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

2. To determine economizer/storage vessel pressure, attacha 30 in.-0-400 psi (-101-0-2760 kPa) gage to the vessel.3. Refer to Fig. 32 for valve locations and numbers.Transfer, addition, or removal of refrigerant in spring-isolated chillers may place severe stress on external pip-ing if springs have not been blocked in both up and downdirections.Transferring Refrigerant into the Economizer/Storage Vessel — These steps describe the method ofmoving refrigerant from the cooler/condenser/compressor sec-tions into the economizer/storage vessel. This is normallydone to prepare for service work on the cooler, condenser, orthe compressor components or for long-term chillershutdown.1. Isolate and push refrigerant into the economizer/storagevessel with the pumpout compressor.a. Valve positions: (Blank spaces indicate open valves).VALVE 1 2 3 4 5 6 7 8 9 10 11CONDITION C C C C C Cb. Turn off the chiller water pumps and pumpout con-denser water.c. Turn on pumpout compressor to push liquid out of thecooler/condenser/compressor section.d. When all liquid has been pushed into the economizer/storage vessel, close the cooler isolation valve 7.e. Access the CONTROL TEST table on the LID. Selectthe PUMPDOWN/LOCKOUT screen. From this screen,turn on the chiller water pumps and view the chillerpressures.f. Turn off pumpout compressor.2. Evacuate refrigerant gas from the cooler/condenser/compressor vessel.a. Valve positions: close valves 2 and 5, open valves 3and 4.VALVE 1 2 3 4 5 6 7 8 9 10 11CONDITION C C C C C C Cb. Turn on the pumpout condenser water.c. Run the pumpout compressor until the suction reaches15 in. Hg (50 kPa abs). Monitor pressures on the LIDand on the refrigerant gages.d. Close valve 1.e. Turn off pumpout compressor.f. Close valves 3, 4, and 6. (All valves are now closed.)g. Turn off pumpout condenser water.h. Use the PUMPDOWN LOCKOUT screen on the LIDto turn off the chiller water pumps and to lock out thechiller compressor from operation.Fig. 33 — Pumpout Unit Wiring SchematicLEGEND1 — Compressor MotorCircuit Disconnect2 — Control CircuitDisconnectC — ContactorOL — Compressor OverloadRLA — Rated Load AmpsT’stat — Internal ThermostatCompressor TerminalContactor TerminalOverload TerminalPumpout Unit TerminalCOMPRESSOR MOTORHz Ph Volts Max. RLA50 3 400 4.7603 298 10.93 230 9.53 460 4.73 375 3.8CONDENSERWATERCONNECTIONS(FIELD PIPING) CONDENSERDISCHARGE VALVEVENT VALVECONTROL BOX(WIRING BYCONTRACTOR)COMPRESSORVALVESVALVESFig. 34 — Optional Pumpout Compressor66