York YK M3 M3 G4 operation manual System Pressures, Vacuum Testing

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TABLE 3 – 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

NOTES: PSIA

= Lbs. per sq. in. gauge pressure

 

=

760 mm Hg. absolute pressure at 32°F

 

= Pressure above atmosphere

 

=

29.921 inches Hg. absolute at 32°F

PSIA

= Lbs. per sq. in. absolute pressure

 

 

 

= Sum of gauge plus atmospheric pressure

VACUUM TESTING

After the pressure test has been completed, the vacuum test should be conducted as follows:

1.Connect a high capacity vacuum pump, with indi- cator, to the system charging valve as shown in Fig. 22 and start the pump. (See “Vacuum Dehydra- tion”.)

2.Open wide all system valves, including the purge and gauge valves. Be sure all valves to the atmo- sphere are closed.

3.Operate the vacuum pump in accordance with VACUUM DEHYDRATION until a wet bulb tempera- ture of +32°F or a pressure of 5 mm Hg is reached. See Table 3 for corresponding values of pressure.

4.To improve evacuation circulate hot water (not to exceed 125°F) through the cooler 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 pressure and the cooler head drain connection, out the cooler

vent connection, into the condenser head drain and out the condenser vent. To avoid the possibility of causing leaks, the temperature should be brought up slowly 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 vacuum 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 8 hours the wet bulb temperature in the vacuum indicator has not risen above 40°F or a pressure of 6.3 mm Hg, the system may be considered tight.

NOTE: Be sure the vacuum indicator is valved off while holding the system vacuum and be sure to open the valve between the vacuum 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 specified in Step 6 above, the leak must be found and repaired.

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YORK INTERNATIONAL

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Contents Centrifugal Liquid Chillers With Microcomputer Control CenterTable of Contents Nomenclature System Operation Description See Fig SectionDescription of System and Fundamentals of Operation Detail a Compressor Prerotation Vanes Capacity ControlSection Microcomputer Control Center Microcomputer Control Center and KeypadIntroduction Condenser Refrigerant LevelDisplaying System Parameters Control CenterOperation Psid = HOP LP Offset Pressure To Display Chilled Liquid TemperaturesTo Display OIL Pressure System Setpoints To Display Motor CurrentTo Display Operating Hours and Starts Counter See Programming System Setpoints, Displaying System Setpoints To Display Undervoltage setpoints Microcomputer Control Center Press Access Code keyProgramming Programming System SetpointsElectro-Mechanical Starter, refer to Fig Solid State Starter, refer to FigKeypad Programming Pull Down Demand Setpoint SetpointKeypad Programming Daily Schedule Setpoint Keypad Programming Holiday Service Keys PRE-ROTATION Vanes KeysOther Service Keys Pulldn Level = XXX% Setp = XXX% Actual = XXX%Operating Modes Compressor Switch Display MessagesSystem RUN Auto Vanes System Shutdown Messages When Control Center is in Remote mode MON Xxxx AM Evap Trans or Probe Error Therefore Function Jumper PositionThen MON Xxxx AM High Line Voltage MON Xxxx AM High Speed Drain Temp OIL Heaters Checking the OIL Level in the OIL System Operating ProceduresSTART-UP Procedure ReservoirSTART-UP Chiller OperationCondenser Water Temperature Control Chiller Starting Sequence & Shutdown SequenceChecking Operation EcwtLchwt Operating LOG SheetWeekly Operating Inspections See SectionDaily QuarterlySafety Shutdowns Need for Maintenance or ServiceNormal and Safety System Shutdowns Cycling ShutdownsProlonged Shutdown START-UP After Prolonged ShutdownSystem Components Description System ComponentsCompressor Lubrication System See Fig GeneralCompressor Speed Increasing GearsSchematic Drawing YK Compressor Lubrication System Heat Exchangers OIL HeaterMotor Driveline Refrigerant Flow ControlVariable Speed Drive Optional Microcomputer Control Center See SectionSolid State Starter Optional Changing the Dehydrator Operational MaintenanceOIL Return System OIL Charging Procedure OIL ChargeTroubleshooting RiseLEP Operating Setpoints System After Service Symptom High Cooler Pressure Operating Analysis ChartSymptom Abnormally LOW Suction Pressure Symptom no OIL Pressure When System Start Button PushedSymptom Reduced OIL Pump Capacity Symptom OIL Pump Vibrates or is NoisySymptom OIL Pump Fails to Deliver OIL Pressure OIL Pressure display keyConducting R-22 Pressure Test MaintenanceLeak Testing During Operation Vacuum Testing System PressuresVacuum Dehydration OperationRefrigerant Charge Refrigerant ChargingChecking the Refrigerant Charge During Unit Shutdown Handling Refrigerant for Dismantling and Repairs Megging the MotorMotor Stator Temperature and Insulation Resistances Condensers and Coolers Testing for Cooler and Condenser Tube Leaks Compressor Electrical ControlsCompressor Motor Preventive MaintenancePressure Testing Cooler and CondenserElectrical Controls ALL Rights Reserved

YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4, YK M3 M3 G4 specifications

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