Refrigerant Charge Determination. The approximate amount of refrigerant charge required by the system varies based on the total length of the refrigerant lines and the size of the chiller. Referring to Figure 7, determine the amount of charge based on the model of the chiller and the amount of charge based on discharge and liquid line sizes and lengths. Add these three numbers together to find the final operating charge. The final operating charge must be verified by running the system and checking the liquid line sight glass.

Figure 7: Refrigerant Charge Determination

 

 

 

 

 

Condenser and Chiller Charge (LBS of R-410a)

 

 

 

Chiller

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Minimum Design Ambient - °F

 

 

 

Model

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

50

 

40

30

 

20

10

0

 

-10

-20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC-20

9

 

9

 

10

11

 

12

13

13

 

13

14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC-30

10

 

10

 

12

14

 

15

16

16

 

17

17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC--40

13

 

13

 

15

17

 

19

20

21

 

21

22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC-50

18

 

19

 

22

25

 

27

29

30

 

31

32

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC-70

25

 

25

 

25

26

 

31

34

36

 

38

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC-90

30

 

30

 

30

32

 

37

41

44

 

47

49

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC-105

51

 

51

 

51

52

 

52

58

63

 

67

71

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC-140

51

 

51

 

51

51

 

51

51

55

 

55

65

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC-175

70

 

70

 

70

70

 

70

70

76

 

76

88

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GPRC-210

80

 

80

 

80

80

 

80

80

80

 

88

94

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Line Size

Discharge Line

 

Liquid Line

 

 

 

 

 

 

 

OD (inches)

 

LBS of R-410a

 

LBS of R-410a

 

 

 

 

 

 

 

3/8

 

0.3

 

 

 

3.2

 

 

 

 

 

 

 

1/2

 

0.6

 

 

 

6.0

 

 

 

 

 

 

 

5/8

 

1.0

 

 

 

9.6

 

 

 

 

 

 

 

3/4

 

1.5

 

 

 

14.4

 

 

 

 

 

 

 

7/8

 

2.1

 

 

 

20.0

 

 

 

 

 

 

 

1-1/8

 

3.7

 

 

 

34.1

 

 

 

 

 

 

 

1-3/8

 

5.6

 

 

 

52.0

 

 

 

 

 

 

 

1-5/8

 

7.9

 

 

 

73.6

 

 

 

 

 

 

 

2-1/8

 

13.7

 

 

 

128.0

 

 

 

 

 

 

 

2-5/8

 

21.2

 

 

 

197.4

 

 

 

 

 

 

Note: The amounts listed above are based on 100 feet of pipe. Actual amounts will be in direct proportion to the actual length of the piping.

Oil Charge Determination. The remote air-cooled portable chillers are factory charged with the amount of oil required without field-installed piping. Additional oil required is dependent on the amount of additional refrigerant added.

Calculate the amount of additional oil required by using the following formula:

Pints of oil (Copeland Ultra 22cc) = lbs of R-410a added for field installed piping / 100.

GP Series Portable Chillers

Chapter 3: Installation

25 of 90

Page 24 Page 26
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Sterling 882.93092.01 manual Refrigerant Charge Determination
Page 24 Page 26

882.93092.01 specifications

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