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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 Controller Model Minimum Tank Size
Less than 12 gpm SubDrive300 8 gallon
12 gpm and higher SubDrive300 20 gallon
NOTE: Check tank precharge regularly to maintain optimum
pressure regulation.
The pressure tank pre-charge setting should be 70% of the system pressure
sensor setting as indicated in the following table.
System Pressure
(at Pressure Sensor)
Pressure Tank
Setting (±2 psi)
25 18
30 21
35 25
40 28
45 32
50 35 Factory Setting
55 39
60 42
65 46
70 49
75 53
80 56
Table 4: Pressure Tank Precharge (PSI)