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

Inspect Water Piping — Refer to the piping diagramsprovided in the certified drawings and the piping instruc-tions in the 17EX Installation Instructions manual. Inspectthe piping to the cooler and condenser. Be sure that flowdirections are correct and that all piping specifications havebeen met.Piping systems must be properly vented, with no stress onthe waterbox nozzles and covers. Water flows through thecooler and condenser must meet job requirements. Measurethe pressure drop across the cooler and condenser.Water must be within design limits, clean, and treatedto ensure proper chiller performance and reduce the po-tential of tube damage due to corrosion, scaling, or ero-sion. Carrier assumes no responsibility for chiller dam-age resulting from untreated or improperly treatedwater.Check Optional Pumpout Compressor Water Pip-ing — If the optional pumpout system is installed, checkto ensure that the pumpout condenser water has been pipedin. Check for field-supplied shutoff valves and controls asspecified in the job data. Check for refrigerant leaks on field-installed piping.Check Relief Devices — Be sure that relief deviceshave been piped to the outdoors in compliance with the lat-est edition of ANSI/ASHRAE (American National Stan-dards Institute/American Society of Heating, Refrigeration,and Air Conditioning Engineers) Standard 15 and applicablelocal safety codes. Piping connections must allow for accessto the valve mechanism for periodic inspection and leaktesting.Relief valves are set to relieve at the 225 psig (1551 kPa)chiller design pressure.Inspect WiringDo not check voltage supply without proper equipmentand precautions. Serious injury may result. Follow powercompany recommendations.Do not apply any kind of test voltage, including to checkcompressor oil pump even for a rotation check, if thechiller is under a dehydration vacuum. Insulation break-down and serious damage may result.1. Examine wiring for conformance to job wiring dia-grams and to all applicable electrical codes.2. Compare the ampere rating on the starter nameplate withthe compressor nameplate. The overload trip amps mustbe 108% to 120% of the rated load amps.3. The starter for a centrifugal compressor motor must con-tain the components and terminals required for PIC re-frigeration control. Check the certified drawings.4. Check the voltage to the following components and com-pare to the nameplate values: compressor and gear oilpump contactors, pumpout compressor starter, and powerpanel.5. Be sure that fused disconnects or circuit breakers havebeen supplied for the compressor and gear oil pumps,power panel, and pumpout unit.6. Check that all electrical equipment and controls are prop-erly grounded in accordance with job drawings, certi-fied drawings, and all applicable electrical codes.7. Make sure that the customer’s contractor has verifiedthe proper operation of the pumps, cooling tower fans,and associated auxiliary equipment. This includes en-suring that motors are properly lubricated, have properelectrical supply, and have proper rotation.8. Tighten all wiring connections to the plugs on the SMM,8-input, and PSIO modules.9. Ensure that the voltage selector switch inside the powerpanel is switched to the incoming voltage rating, 115 v.The 230 v alternative is not used.10. On chillers with free-standing starters, inspect the powerpanel to ensure that the contractor has fed the wires intothe bottom of the panel. Wiring into the top of the panelcan cause debris to fall into the contactors. Clean andinspect the contactors if this has occurred.Voltage to terminals LL1 and LL2 comes from a con-trol transformer in a starter built to Carrier specifica-tions. Do not connect an outside source of control powerto the compressor motor starter (terminals LL1 and LL2).An outside power source will produce dangerous volt-age at the line side of the starter, because supplying volt-age at the transformer secondary terminals produces in-put level voltage at the transformer primary terminals.CHECK INSULATION RESISTANCE — Before applyingoperating voltage to the motor, whether for checking rota-tion direction or for actual operation, measure the resistanceof the stator winding insulation.The test voltage, based on the motor operating voltage, isas follows:Operating Voltage DC Test Voltage0- 900 500901- 7000 10007001-14500 2500This is particularly important if the motor may have beenexposed to excessive dampness either during transit or whilein storage. A ‘‘megger’’ type instrument can be used to mea-sure the insulation resistance. The test voltage should be ap-plied between the entire winding (all winding leads connectedtogether) and ground for approximately one minute with thewinding at ambient temperature. The recommended mini-mum insulation resistance is determined as follows:RM = KV + 1WhereRM = Recommended minimum insulation resis-tance in megohms at 104° F (40° C) of theentire winding.KV = Rated motor terminal to terminal voltage inkilovolts (1000 volts = 1 KV).On a new winding, where the contaminant-causing lowinsulation resistance is generally moisture, drying the wind-ing through the proper application of heat normally in-creases the insulation resistance to an acceptable level.The following methods are acceptable for applying heat toa winding:1. If the motor is equipped with space heaters, energize theheaters to heat the winding.50