Pressure Tank
The SubDrive needs only a small pressure tank to maintain constant pressure (see table below for recommended tank size). For pumps rated 12 gpm or more, a slightly larger tank is recommended for optimum pressure regulation. The SubDrive can also use an existing tank with a much larger capacity.
Table 3: Minimum Pressure Tank Size (Total Capacity)
Pump Flow Rating
Less than 12 gpm 12 gpm and higher
Controller Model
SubDrive300
SubDrive300
Minimum Tank Size
8gallon
20gallon
The pressure tank
Table 4: Pressure Tank Precharge (PSI)
System Pressure | Pressure Tank |
(at Pressure Sensor) | Setting (±2 psi) |
25
30
35
40
45
50
55
60
65
70
75
80
18
21
25
28
32
35Factory Setting
NOTE: Check tank precharge regularly to maintain optimum pressure regulation.
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