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WSHP-SVN08B-EN 23
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.
Water Volume
Table 8 is provided for use in calculating glycol requirements for the unit.
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.
Table 7: Water pressure drops (WPD) in feet of head
Unit Size
GPM
Cooling Heating
EWT
F
Ft. Head
Pressure
EWT
F
Ft. Head
Pressure
009
1.5
77
5.1
55
5.8
2.3 9.3 10.6
2.7 12.4 14.0
012
2.5
77
10.2
55
8.5
3.1 14.6 16.6
3.7 19.6 22.0
015
2.3
77
6.2
55
7.4
3.5 12.3 14.1
4.2 16.8 18.8
018
2.9
77
2.4
55
3.1
4.5 4.9 5.9
5.4 6.6 7.7
024
3.9
77
5.0
55
6.2
6.0 9.9 11.8
7.2 13.2 14.5
036
5.9
77
4.9
55
5.5
9.0 9.8 11.0
10.8 13.3 14.7
Table 8: Water volume
Unit
Model
GET
Water Side
Volume
Cubic In.
Water Side
Volume
Cubic Ft.
Water Side
Volume
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
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