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WSHP-SVX04A-EN 29
Operating Pressures
Water Pressure Drop
Table 4 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 5 is provided for use in calculating glycol requirements for the WPVJ 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.
Start-up Checklist and Log
Use the form on page 30 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 4: Water pressure drops (WPD) in feet of head
Unit Size
GPM
Cooling Heating
EWT
F
Ft. Head
Pressure
EWT
F
Ft. Head
Pressure
WPVJ 018 5.0
77
7.5
55
9.0
WPVJ 024
6.1 10.2 12.1
WPVJ 030
7.2 4.9 6.0
WPVJ 036 8.6 6.7 7.9
WPVJ 042
10.1 8.8 10.0
WPVJ 048
11.5 7.8 9.0
WPVJ 060 14.9 12.4 14.1
WPVJ 072
16.5 14.8 14.1
WPHF 021 5.3
77
6.9
55
7.6
WPHF 027
6.8 11. 1 12.3
WPHF 035
8.7 17.9 19.8
WPHF 040 9.9 23.1 25.6
WPHF 047
11. 6 15.0 16.6
WPHF 057
14.1 22.0 24.4
Unit
Model
Unit
Size
Water Side
Volume
Cubic In.
Water Side
Volume
Cubic In.
Water Side
Volume
Gallons.
WPVJ 018-024 55 0.032 0.238
WPVJ 030-042 105 0.061 0.455
WPVJ 048-072 259 0.150 1.121