Liebert ITR Calculating Subcooling, Example, Temperature Pressure Gauge Psig KPa

Page 63

R407C Refrigerant

Table 33 R407C pressure/temperature chart for subcooling only (liquid measurements)

Temperature

Pressure Gauge

Temperature

Pressure Gauge

Temperature

Pressure Gauge

 

 

 

 

 

 

 

 

 

 

 

 

°F

°C

Psig

kPa

°F

°C

Psig

kPa

°F

°C

Psig

kPa

 

 

 

 

 

 

 

 

 

 

 

 

36.0

2.2

73

500

59.0

15.0

114

786

94.0

34.4

203

1402

 

 

 

 

 

 

 

 

 

 

 

 

37.0

2.8

74

511

60.0

15.6

116

801

96.0

35.6

209

1444

 

 

 

 

 

 

 

 

 

 

 

 

38.0

3.3

76

522

61.0

16.1

118

815

98.0

36.7

216

1488

 

 

 

 

 

 

 

 

 

 

 

 

39.0

3.9

77

533

62.0

16.7

120

830

100.0

37.8

222

1532

 

 

 

 

 

 

 

 

 

 

 

 

40.0

4.4

79

544

63.0

17.2

123

845

102.0

38.9

229

1578

 

 

 

 

 

 

 

 

 

 

 

 

41.0

5.0

81

556

64.0

17.8

125

860

104.0

40.0

236

1624

 

 

 

 

 

 

 

 

 

 

 

 

42.0

5.6

82

567

65.0

18.3

127

875

106.0

41.1

242

1671

 

 

 

 

 

 

 

 

 

 

 

 

43.0

6.1

84

579

66.0

18.9

129

891

108.0

42.2

249

1720

 

 

 

 

 

 

 

 

 

 

 

 

44.0

6.7

86

591

67.0

19.4

131

906

110.0

43.3

257

1769

 

 

 

 

 

 

 

 

 

 

 

 

45.0

7.2

87

602

68.0

20.0

134

922

112.0

44.4

264

1819

 

 

 

 

 

 

 

 

 

 

 

 

46.0

7.8

89

615

69.0

20.6

136

938

114.0

45.6

271

1870

 

 

 

 

 

 

 

 

 

 

 

 

47.0

8.3

91

627

70.0

21.1

138

954

116.0

46.7

279

1922

 

 

 

 

 

 

 

 

 

 

 

 

48.0

8.9

93

639

72.0

22.2

143

987

118.0

47.8

287

1975

 

 

 

 

 

 

 

 

 

 

 

 

49.0

9.4

95

652

74.0

23.3

148

1021

120.0

48.9

294

2029

 

 

 

 

 

 

 

 

 

 

 

 

50.0

10.0

96

664

76.0

24.4

153

1055

122.0

50.0

302

2085

 

 

 

 

 

 

 

 

 

 

 

 

51.0

10.6

98

677

78.0

25.6

158

1090

124.0

51.1

310

2141

 

 

 

 

 

 

 

 

 

 

 

 

52.0

11.1

100

690

80.0

26.7

163

1126

126.0

52.2

319

2198

 

 

 

 

 

 

 

 

 

 

 

 

53.0

11.7

102

704

82.0

27.8

169

1163

128.0

53.3

327

2256

 

 

 

 

 

 

 

 

 

 

 

 

54.0

12.2

104

717

84.0

28.9

174

1201

130.0

54.4

336

2315

 

 

 

 

 

 

 

 

 

 

 

 

55.0

12.8

106

730

86.0

30.0

180

1239

132.0

55.6

345

2376

 

 

 

 

 

 

 

 

 

 

 

 

56.0

13.3

108

744

88.0

31.1

185

1279

134.0

56.7

354

2437

 

 

 

 

 

 

 

 

 

 

 

 

57.0

13.9

110

758

90.0

32.2

191

1319

136.0

57.8

363

2500

 

 

 

 

 

 

 

 

 

 

 

 

58.0

14.4

112

772

92.0

33.3

197

1360

138.0

58.9

372

2563

 

 

 

 

 

 

 

 

 

 

 

 

-

-

-

-

-

-

-

-

140.0

60.0

381

2628

 

 

 

 

 

 

 

 

 

 

 

 

NOTE

Use this table for subcooling calculation ONLY. See Table 32 for superheat or control adjustment.

8.1Calculating Subcooling

Example

Measure the liquid pressure (e.g., 200 psig). Find the liquid saturation temperature at that pressure on Table 33 (e.g., 93°F). Measure the temperature of the liquid line (e.g., 90°F). Subtract the actual temperature from the liquid saturation temperature to obtain the subcooling (e.g., 93 – 90 = 3°F). If the actual temperature is greater than the liquid saturation temperature, then there is no subcooling, and the fluid may be a mixture of liquid and vapor.

Why There Are Two R407C Temperature and Pressure Tables

R407C is a blend of refrigerants that exhibits a temperature “glide” of approximately 8 to 12°F (4 to 7°C. This “glide” is the difference between the liquid and vapor saturation temperatures at a given pressure. Use the correct table for the saturation temperature you need. Table 32 is for super- heat or operating controls. Table 33 is for subcooling only.

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Contents Liebert Challenger ITR Page Table of Contents Chilled Water Models Split System ModelsR407C Refrigerant Figures Tables System Descriptions Location Considerations Remote Sensor Installation LocationRoom Preparation Equipment InspectionDomestic Export Model Lb kg 50Hz Models 60Hz Models Unit shipping weightsHandling With Skid Removal of SkidUnit Weight Cabinet dimensionsSL-11897 Piping Considerations Drain LinePiping connection size Piping Outlet Locations Piping connections for split system fan coil units Piping connections for water/glycol and Glycool units Piping connections for chilled water self-contained units Electrical connections Electrical ConnectionsPlenum Installation Balancing the Air DistributionDucted Applications Checklist for Completed Installation Lee-Temp/Flood Back Head Pressure Control Condensers Condenser LocationLine Voltage Low VoltageAir-cooled condenser statistics Equivalent Length Hot Gas Line Liquid Line Refrigerant PipingRecommended line sizes OD copper inches 23 & 33 kW 067A 065ACondenser refrigerant per serial tag Fan Speed Control SystemsMaterials Supplied Equivalent lengths feet for various pipe fittingsDehydration/Leak Test Single Circuit Shown Piping Refrigerant control settings psi kPaLee-Temp/Flood Back Head Pressure Control Systems ChargingMaterials Supplied Low Pressure Cut Out High Pressure Cut Out 360 Single Circuit Shown Condenser Water-cooled general arrangement Water Regulating Valve Manual Flushing Water Regulating Valve AdjustmentTesting Valve Function Water Regulating ValveDrycooler Installation Drycooler LocationPump and Drycooler Dry Bulb Wet Bulb Relative Dew Point Humidity Room dew point temperaturesGlycol Piping Expansion Tanks, Fluid Relief Valves and Other DevicesPreparing the System for Filling Indoor unit glycol volume approximate gallons liters maxVolume in standard Type L copper piping Filling InstructionsGlycol Solutions Ethylene glycol concentrations@ 50F 10C Filling the System 483mm 43-3/16 1097mm For expansion tank dimensions, see on43-9/16 110 5mm See Note 30-1/4Pump Pump Suction Pump Discharge Connection Mounting hole dimensional dataDrycooler data Glycol pump dataGlycol general arrangement Glycool general arrangement Glycol Regulating Valve Glycol Regulating Valve AdjustmentChilled Water Models Water/Glycol-Cooled Condensing Units Air-Cooled Condensing UnitsRefrigerant Loop Unit refrigerant charge Recommended refrigerant lines R22 or R407C sizes OD copperLine coupling sizes Evaporator Condensing Unit EvaporatorQuick Connect Fittings Outdoor Air-Cooled Condensing Units Unit Dimensions See TablePFH067A-L See Table Outdoor air-cooled condensing unit-top air discharge modelsPiping and electrical connections top air discharge 36-1/4 38-1/2152 SL-11081 PG 8A Electrical field connections, prop fan condensing moduleIndoor centrifugal condensing unit Installing the Indoor Condensing UnitModel Net Weight 60 Hz 50 Hz Lb kg MC65A MC64A Centrifugal Air-Cooled Condensing UnitsAirflow CFM CMH DuctingCentrifugal air-cooled condensing unit dimensional data AIR Cooled Water Cooled Condenser Water Requirements Regulating Valve Adjustment and TestingWater and Glycol-Cooled Condensing Units Piping ConsiderationsWater/glycol-cooled condensing unit dimensions WATER/GLYCOL R407C Refrigerant Temperature Gauge Pressure Psig KPaTemperature Pressure Gauge Psig KPa Calculating SubcoolingExample That Ne tIti Ti n

ITR specifications

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