Operating Pressures

Water Pressure Drop

Tables 6 and 7 should be used to define feet of head/pressure drop. Note: To calculate feet of head, when using gauges that read in PSIG, multiply PSI by 2.31.

Table 6: Cooling water pressure drops (WPD) in feet of head

Table 7: Heating water pressure drops (WPD) in feet of head

Unit Size

024

036

042

048

060

072

240

GPM

3.8

7.0

8.9

4.6

8.5

10.8

5.2

9.5

12.1

6.0

11.0

14.0

7.6

14.0

17.8

8.7

16.0

20.4

30.0

55.0

70.0

Source

EWT Ft. Head

FPressure

1.3

804.5

7.2

1.9

806.6

10.6

2.4

808.6

14.1

3.3

8011.6

19.1

5.4

8019.1

31.5

7.1

8025.3

41.8

2.9

808.1

12.2

Load

EWT Ft. Head

FPressure

1.6

53.65.4

8.7

2.3

53.67.9

12.7

3.0

53.610.3

17.1

4.0

53.614.0

23.1

6.5

53.623.1

38.1

8.6

53.630.5

50.5

3.6

53.69.7

14.7

Unit Size

024

036

042

048

060

072

240

GPM

3.8

7.0

8.9

4.6

8.5

10.8

5.2

9.5

12.1

6.0

11.0

14.0

7.6

14.0

17.8

8.7

16.0

20.4

30.0

55.0

70.0

Source

EWT Ft. Head

F Pressure

1.5

605.1

8.3

2.2

607.6

12.2

2.8

609.8

16.2

3.8

6013.3

21.9

6.2

6021.9

36.1

8.2

6028.9

47.9

3.4

609.2

13.9

Load

EWT Ft. Head

F Pressure

1.3

804.5

7.2

1.9

806.6

10.6

2.4

808.6

14.1

3.3

8011.6

19.1

5.4

8019.1

31.5

7.1

8025.3

41.8

2.9

808.1

12.2

Water Volume

Table 8 is provided for use in calculating glycol requirements for the unit.

Table 8: Water volume

Unit Size

024

036

042

048

060

072

240

Water Side

Water Side

Water Side

Volume

Volume

Volume

Cubic In.

Cubic Ft.

Gallons

55

0.032

0.238

105

0.061

0.455

105

0.061

0.455

259

0.150

1.121

259

0.150

1.121

259

0.150

1.121

1057

0.615

4.576

 

 

 

Note: The EXWA 240 has two circuits.

Flow Checks

For the operating temperature drop (heating) and rise (cooling), refer to Table OP1 and OP2 for the proper water tempera- ture change. Depending on the unit size, entering water temperature and water flow rate, the cooling temperature rise is from 8°F-16°F. Based on the same criteria for heating, the temperature drop is from 2°F-13°F.

Pressure

Using the P/T ports and one 0-60 psi pressure gauge with the P/T port adapter, measure the pressure difference between the water-in and water-out connections. Compare the pressure differential to Table 6 to determine flow.

Start-up Checklist and Log

Use the form on page 24 to log system and unit temperatures during start-up.

WSHP-SVX02A-EN

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Trane GSWD, EXWA, WPWD manual Water Volume, Flow Checks, Pressure, Start-up Checklist and Log

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