INSTALLATION AND SETUP
Installation Process
13
Minimum Pressure Tank and Supply Pipe Sizing
A VFD system needs only a small pressure tank to maintain constant pressure, although a larger tank may
be used. The pressure tank pre-charge setting should be 70% of the targeted system pressure.
NOTE:
The included transducer measures up to 200 PSI, ensure that the pressure tank is rated adequately.
For larger flow rates, consult pressure tank manufacturer for tank size selection.
Minimum Supply Pipe Sizes
The minimum supply pipe diameter past the pressure sensor (transducer) should be selected not to exceed
a maximum velocity of 8 feet per second (2.4 m/s) based on the flow rate of the system.
IMPORTANT:
Water system piping should be performed by an experienced professional to ensure adequate
flow.
Maximum Pump Flow
Minimum Tank Size
10 GPM
2 gallons (7.6 liters)
20 GPM
4 gallons (15.1 liters)
30 GPM
4 gallons (15.1 liters)
40 GPM
8 gallons (30.3 liters)
Over 40 GPM
20 gallons (75.7 liters)
Maximum GPM (lpm)
Minimum Pipe Diameter
11.0 (41.6)
0.75”
19.6 (74.2)
1”
30.6 (115.8)
1.25”
44.1 (166.9)
1.5”
78.3 (296.4)
2”
122.4 (463)
2.5”
176.3 (667)
3”
240.0 (908)
3.5”
313.3 (1186)
4”
396.6 (1501)
4.5”
489.6 (1853)
5”