Franklin Electric SUBDRIVE CONNECT Serie Manuel Du Propriétaire page 15

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.
• If adding a drive to a system with an existing large tank, refer to
ments (FE Connect App Only)" on page
• The pressure tank pre-charge setting should be 70% of the targeted system pressure.
Refer to the following recommendations for best performance.
Submersible Pump Applications
Pump Flow Rating
Less than 12 gpm (45.4 lpm)
12 gpm (45.4 lpm) and higher
Surface Pump Applications
Maximum Pump Flow
GPM
10
20
30
40
Minimum Supply Pipes
Maximum GPM (lpm)
11.0 (41.6)
19.6 (74.2)
30.6 (115.8)
44.1 (166.9)
78.3 (296.4)
122.4 (463)
176.3 (667)
240.0 (908)
313.3 (1186)
396.6 (1501)
489.6 (1853)
The minimum supply pipe diameter past the pressure sensor (transducer) should be selected not to ex-
ceed 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 verified by an experienced professional to ensure adequate
flow.
33.
Minimum Tank Size
gallons (liters)
2 (7.6)
4 (15.1)
4 (15.1)
8 (30.3)
Minimum Pipe Diameter (inches)
0.75
1.25
1.5
2
2.5
3
3.5
4
4.5
5
Minimum Pressure Tank and Supply Pipe Sizing
"Tank Size and Bump Mode Adjust-
VFD Model
SubDrive 15
SubDrive 20
SubDrive 30
SubDrive 50
SubDrive 15
SubDrive 20
SubDrive 30
SubDrive 50
1
INSTALLATION PLANNING
Minimum Tank Size
2 gallons (7.6 liters)
4 gallons (15.1 liters)
4 gallons (15.1 liters)
8 gallons (30.3 liters)
4 gallons (15.1 liters)
8 gallons (30.3 liters)
8 gallons (30.3 liters)
20 gallons (75.7 liters)
15