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York MaxE YK Скачать руководство пользователя страница 29

FORM 160.73-O2 (605)

29

YORK INTERNATIONAL

HANDLING REFRIGERANT FOR

DISMANTLING AND REPAIRS

MEGGING THE MOTOR

If it becomes necessary to open any part of the re frig er ant
system for repairs, it will be necessary to re move the charge
before opening any part of the unit. If the chiller is equipped
with optional valves, the refrigerant can be iso lat ed in either
the condenser or evaporator / compressor while making
any necessary repairs.

While the main disconnect switch and compressor mo tor
starter are open, meg the motor as follows:

1. Using a megohm meter (megger), meg between

phas es and each phase to ground (See Fig. 13); these
read ings are to be interpreted using the graph shown
in Fig. 14.

2. If readings fall below shaded area, remove ex ter nal

leads from motor and repeat test.

Motor is to be megged with the
starter at ambient temperature after
24 hours of idle stand by.

FIG. 13 –

DIAGRAM, MEGGING MOTOR WIND INGS

LD00475

6

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Содержание MaxE YK

Страница 1: ...CENTRIFUGAL LIQUID CHILLERS Supersedes 160 73 O2 1202 Form 160 73 O2 605 MODEL YK STYLE F R 134a COOLING ONLY WITH OPTIVIEWTM CONTROL CENTER FOR ELECTRO MECHANICAL STARTER SOLID STATE STARTER VARIABLE...

Страница 2: ...materials This individual shall also be familiar with and comply with all applicable governmental standards and regulations pertaining to the task in question SAFETY SYMBOLS The following symbols are...

Страница 3: ...NCLATURE YK CB CB P6 CM F MOTOR CODE 60 Hz 50 Hz CH CX 5CE 5CT CJ CY 5CF 5CU CK CZ 5CG 5CV CL CA 5CH 5CW CM CB 5CI 5CX CN DA 5CJ 5DA CP DB 5CK 5DB CR DC 5CL 5DC CS DD 5CM 5DD CT DE 5CN 5DE CU DF 5CO 5...

Страница 4: ...ystem and Fundamentals of Operation 6 SECTION 2 System Operating Procedures 9 SECTION 3 System Components Description 15 SECTION 4 Operational Maintenance 21 SECTION 5 Troubleshooting 23 SECTION 6 Mai...

Страница 5: ...M STARTER SOLID STATE STARTER 10 FIG 5 CHILLER STARTING SEQUENCE SHUTDOWN SEQUENCE VARIABLE SPEED DRIVE 11 FIG 6 LIQUID CHILLER LOG SHEETS 12 FIG 7 SYSTEM COMPONENTS 15 FIG 8 SCHEMATIC DRAWING YK COMP...

Страница 6: ...n external SECTION 1 DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION 00116vip CONDENSER CONTROL CENTER COMPRESSOR MOTOR EVAPORATOR FIG 1 MODEL YK MAXETM CHILLER SYSTEM OPERATION DESCRIPTION SEE FI...

Страница 7: ...ity for only a relatively small part of the time the unit is in operation CAPACITY CONTROL The major components of a chiller are selected for full load capacities therefore capacity must be controlled...

Страница 8: ...FORM 160 73 O2 605 8 FIG 2 REFRIGERANT FLOW THRU CHILLER PREROTATION VANES See Detail A SUCTION EVAPORATOR ELIMINATOR OIL COOLER LD00924 FLOW CONTROL ORIFICE SUB COOLER CONDENSER DISCHARGE BAFFLE DIS...

Страница 9: ...operated start the pump The Control Center will not allow the chiller to start unless chilled liquid ow is established through the unit A eld supplied chilled water ow switch is required If the chill...

Страница 10: ...rt to circulate oil for a 50 second pre run to establish oil ow and adequate lubrication to all bearings gears and rotating surfaces within the compressor The high and low oil pressure transducers OP...

Страница 11: ...current limit software function plus the 3 phase 100 solid state overload current limiter CM 2 on Electro Mechanical Starter applications or the Solid State Starter current Limit function will overrid...

Страница 12: ...ing condenser water temperature may be as much as 25 F 14 C colder than the standby return chilled water temperature Cooling tower fan cycling will normally provide adequate control of the entering co...

Страница 13: ...erant analysis NEED FOR MAINTENANCE OR SERVICE If the system is malfunctioning in any manner or the unit is stopped by one of the safety controls consult the Operation Analysis Chart Table 1 pages 23...

Страница 14: ...water from the cooling tower condenser condenser pump and the chilled water system chilled water pump and coils Open the drains on the evaporator and condenser liquid heads to assure complete drainage...

Страница 15: ...SECTION 3 SYSTEM COMPONENTS DESCRIPTION MOTOR EVAPORATOR COMPRESSOR SUCTION DUAL RELIEF VALVES SIGHT GLASS VARIABLE SPEED OIL PUMP CONTROL BOX REFRIGERANT CHARGING VALVE 00611vip FRONT VIEW FIG 7 SYS...

Страница 16: ...YORK INTERNATIONAL FORM 160 73 O2 605 16 FIG 7 SYSTEM COMPONENTS CONT D 28778A DISCHARGE LINE OIL COOLER OIL RESERVOIR PUMP REAR VIEW System Components Description...

Страница 17: ...d all interconnecting oil piping and passages There are main points within the motor compressor which must be supplied with forced lubri cation as follows 1 Compressor Drive Shaft Low Speed a Shaft se...

Страница 18: ...YORK INTERNATIONAL FORM 160 73 O2 605 18 LOW SPEED GEAR REAR BEARING DOUBLE BELLOWS SHAFT SEAL FIG 8 SCHEMATIC DRAWING YK COMPRESSOR LUBRICATION SYSTEM LD08577 System Components Description...

Страница 19: ...rcurrent transformers are furnished with all units HEAT EXCHANGERS Evaporator and condenser shells are fabricated from rolled carbon steel plates with fusion welded seams Heat exchanger tubes are inte...

Страница 20: ...refrigerant Isolation of the refrigerant in this sys tem must be performed by a quali ed service technician OPTIONAL HOT GAS BYPASS Hot gas bypass is optional and is used to eliminate compressor surge...

Страница 21: ...ducing the low pressure oil rich liquid to ow from the evaporator through the dehydrator to the compressor sump CHANGING THE DEHYDRATOR To change the dehydrator use the following pro cedure 1 Shut the...

Страница 22: ...mp discharge connection to the oil charging valve A located on the remote oil reservoir cover plate See Fig 10 Do not tighten the connection at the charging valve until after the air is forced out by...

Страница 23: ...ant into system greater than normal with high discharge Variable ori ce problem Remove obstruction temperature Temperature difference between leaving Evaporator tubes dirty or Clean evaporator tubes c...

Страница 24: ...SYMPTOM REDUCED OIL PUMP CAPACITY Oil pump pumping capacity Excessive end clearance Inspect and replace worn parts pump Other worn pump parts Partially blocked oil supply Check oil inlet for blockage...

Страница 25: ...ector can be used to detect any leaks too small to be found by the soap test To test with R 22 proceed as follows 1 With no pressure in the system charge R 22 gas into the system through the charging...

Страница 26: ...isconnect the vacuum pump leaving the vac uum indicator in place 6 Hold the vacuum obtained in Step 3 in the system for 8 hours the slightest rise in pressure indicates a leak or the presence of moist...

Страница 27: ...d found to be tight prior to evacuation then the saturation temperature recordings should follow a curve similar to the typical saturation curve shown as Fig 12 The temperature of the water in the tes...

Страница 28: ...iller model See Table 3 Charge the correct amount of refrigerant and record the level in the evaporator sight glass The refrigerant charge should always be checked and trimmed when the system is shut...

Страница 29: ...the condenser or evaporator compressor while making any necessary repairs While the main disconnect switch and compressor motor starter are open meg the motor as follows 1 Using a megohm meter megger...

Страница 30: ...ERNATIONAL FORM 160 73 O2 605 30 LD00476 FIG 14 MOTOR STARTER TEMPERATURE AND INSULATION RESISTANCES Minimum Insulation Resistance vs Temperature per IEEE Std 43 Open Motors Maintenance TEMPERATURE F...

Страница 31: ...ead pressure over a period of time accompanied by a steady rise in condensing temperature and noisy operation These symptoms may also be due to foul gas buildup Purging will remove the foul gas reveal...

Страница 32: ...the ends of all tubes with water Do not use carbon tetrachloride for this purpose since its fumes give the same ame discoloration that the refrigerant does 3 With nitrogen or dry air blow out the tub...

Страница 33: ...lines passages or dirty oil lters If the unit is shutting down on HOT High Oil Temperature or Low Oil Pressure OP change the oil lter element Examine the oil lter element for the presence of alu minum...

Страница 34: ...re not supplied and bearings are designed for long life under standard conditions Frames 284T thru 587UZ are furnished with double shielded or open ball or roller bearings It is necessary to re lubric...

Страница 35: ...user to provide for proper water treatment to provide for a longer and more economical life of the equipment The following recommendation should be followed in determining the condition of the water...

Страница 36: ...861 1001 www york com P O Box 1592 York Pennsylvania USA 17405 1592 Subject to change without notice Printed in USA Copyright by YORK International Corporation 2005 ALL RIGHTS RESERVED Form 160 73 O2...

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