Operating Pressures

Water Pressure Drop

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

Unit Size

 

 

Cooling

 

Heating

 

GPM

EWT

 

Ft. Head

EWT

 

Ft. Head

 

 

F

 

Pressure

F

 

Pressure

 

1.5

 

 

5.1

 

 

5.8

009

 

77

 

 

55

 

 

2.3

 

9.3

 

10.6

 

2.7

 

 

12.4

 

 

14.0

 

2.5

 

 

10.2

 

 

8.5

012

3.1

77

 

14.6

55

 

16.6

 

3.7

 

 

19.6

 

 

22.0

 

2.3

 

 

6.2

 

 

7.4

015

 

77

 

 

55

 

 

3.5

 

12.3

 

14.1

 

4.2

 

 

16.8

 

 

18.8

 

2.9

 

 

2.4

 

 

3.1

018

4.5

77

 

4.9

55

 

5.9

 

5.4

 

 

6.6

 

 

7.7

 

3.9

 

 

5.0

 

 

6.2

024

 

77

 

 

55

 

 

6.0

 

9.9

 

11.8

 

7.2

 

 

13.2

 

 

14.5

 

5.9

 

 

4.9

 

 

5.5

036

9.0

77

 

9.8

55

 

11.0

 

10.8

 

 

13.3

 

 

14.7

Water Volume

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

Table 8: Water volume

Unit

Water Side

Water Side

Water Side

Model

Volume

Volume

Volume

GET

Cubic In.

Cubic Ft.

Gallons

009

17.0

0.010

0.074

 

 

 

 

012

17.0

0.010

0.074

015

36.0

0.021

0.156

 

 

 

 

018

48.0

0.028

0.208

024

55.0

0.032

0.238

 

 

 

 

036

71.0

0.041

0.307

 

 

 

 

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.

!WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety pre- cautions when exposed to live electrical components could result in death or serious injury.

WSHP-SVN08B-EN

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Trane GETB manual Water Pressure Drop, Water pressure drops WPD in feet of head, Water Volume, Flow Checks

GETB specifications

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