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York MaxE YK Скачать руководство пользователя страница 26

YORK INTERNATIONAL

FORM 160.73-O2 (605)

26

VACUUM TESTING

After the pressure test has been completed, the vac u um
test should be conducted as follows:

1. Connect a high capacity vacuum pump, with in di -

ca tor, to the system charging valve as shown in
Fig. 11 and start the pump. (See “Vacuum De hy -
dra tion”.)

2. Open wide all system valves. Be sure all valves to

the at mo sphere are closed.

3. Operate the vacuum pump in accordance with

VAC U UM DEHYDRATION

until a wet bulb

tem per a ture of +32°F or a pressure of 5 mm Hg is
reached. See Table 2 for corresponding values of
pres sure.

4. To improve evacuation circulate hot water (not to

exceed 125°F, 51.7ºC) through the evaporator and
condenser tubes to thoroughly dehydrate the shells.
If a source of hot water is not readily available, a
portable wa ter heater should be employed.

DO NOT

USE STEAM

. A suggested method is to connect a

hose between the source of hot water under pres-
sure and the evaporator head drain connection, out
the evaporator vent connection, into the condenser

head drain and out the condenser vent. To avoid the
possibility of caus ing leaks, the temperature should
be brought up slow ly so that the tubes and shell are
heated evenly.

5. Close the system charging valve and the stop valve

between the vacuum indicator and the vacuum pump.
Then disconnect the vacuum pump leaving the vac-
u um 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 moisture, or both. If, after 24 hours
the wet bulb temperature in the vacuum in di ca tor has
not risen above 40°F (4.4°C) or a pres sure of 6.3 mm
Hg, the system may be considered tight.

Be sure the vacuum indicator is valved
off while holding the system vacuum
and be sure to open the valve between
the vac u um indicator and the system
when checking the vacuum after the
8 hour period.

7. If the vacuum does not hold for 8 hours within the

limits speciﬁ ed in Step 6 above, the leak must be
found and repaired.

TABLE 2 –

SYSTEM PRESSURES

*GAUGE

ABSOLUTE

BOILING

INCHES

OF

TEMPERATURES

MERCURY

(HG)

MILLIMETERS

OF

BELOW ONE

PSIA

OF MERCURY

MICRONS

WATER

STANDARD

(HG)

°F

ATMOSPHERE

0

14.696

760.

760,000

212

10.24"

9.629

500.

500,000

192

22.05"

3.865

200.

200,000

151

25.98"

1.935

100.

100,000

124

27.95"

.968

50.

50,000

101

28.94"

.481

25.

25,000

78

29.53"

.192

10.

10,000

52

29.67"

.122

6.3

6,300

40

29.72"

.099

5.

5,000

35

29.842"

.039

2.

2,000

15

29.882"

.019

1.0

1,000

+1

29.901"

.010

.5

500

–11

29.917"

.002

.1

100

–38

29.919"

.001

.05

50

–50

29.9206"

.0002

.01

10

–70

29.921"

0

0

0

*One standard atmosphere

= 14.696 PSIA

= 760 mm Hg. absolute pressure at 32°F

= 29.921 inches Hg. absolute at 32°F

NOTES: PSIA = Lbs. per sq. in. gauge pressure

= Pressure above atmosphere

PSIA = Lbs. per sq. in. absolute pressure

= Sum of gauge plus atmospheric pressure

Maintenance

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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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