AIM Manual

Electronic Applications » Electronic Products (Page 60)

SubDrive/MonoDrive Pressure Tank Sizing

The SubDrive/MonoDrive needs only a small pressure tank to maintain constant pressure. (See Table X for recommended tank size.) For pumps rated 12 gpm (45.4 lpm) or more, a slightly larger tank is recommended for optimum pressure regulation. The SubDrive/MonoDrive can also use an existing tank with a much larger capacity.

Table 60: Minimum Pressure Tank Size (Total Capacity)
Pump Flow RatingController ModelMinimum Tank Size
Less than 12 gpm (45.4 lpm)SubDrive15, SubDrive 75 or MonoDrive2 gallons (7.6 liters)
SubDrive20 or SubDrive1004 gallons (15.1 liters)
SubDrive30, SubDrive150 or MonoDriveXT4 gallons (15.1 liters)
SubDrive3008 gallons (30.3 liters)
12 gpm and higher (45.4 lpm)SubDrive15, SubDrive 75 or MonoDrive4 gallons (15.1 liters)
SubDrive20 or SubDrive1008 gallons (30.3 liters)
SubDrive30, SubDrive150 or MonoDriveXT8 gallons (30.3 liters)
SubDrive30020 gallons (75.7 liters)
All flowsSubDrive2W20 gallons (75.7 liters)

SubDrive/MonoDrive Pressure Tank Pre-Charge

Table 60A: Pressure Tank Pre-charge (PSI)
System Pressure (at Pressure Sensor)Pressure Tank Setting (±2 psi)
2518
3021
3525
4028
4532
50 (Factory Set) 35
5539
6042
6546
7049
7553
8056
  • 1 PSI = 0.068 bar
  • Note: Check tank pre-charge regularly to maintain optimum pressure regulation.
Table 60B: Minimum Pipe Diameter
Maximum Velocity 8 ft/sec. (2.4 m/s)
Min Pipe DiaMax GPM (lpm)
1/2"4.9 (18.5)
3/4"11.0 (41.6)
1"19.6 (74.2)
1-1/4"30.6 (115.8)
1-1/2"44.1 (166.9)
2"78.3 (296.4)
2-1/2"176.3 (667.4)