AIM Manual
Electronic Applications » Electronic Products (Page 60)
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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 Rating | Controller Model | Minimum Tank Size |
| Less than 12 gpm (45.4 lpm) | SubDrive15, SubDrive 75 or MonoDrive | 2 gallons (7.6 liters) |
| SubDrive20 or SubDrive100 | 4 gallons (15.1 liters) | |
| SubDrive30, SubDrive150 or MonoDriveXT | 4 gallons (15.1 liters) | |
| SubDrive300 | 8 gallons (30.3 liters) | |
| 12 gpm and higher (45.4 lpm) | SubDrive15, SubDrive 75 or MonoDrive | 4 gallons (15.1 liters) |
| SubDrive20 or SubDrive100 | 8 gallons (30.3 liters) | |
| SubDrive30, SubDrive150 or MonoDriveXT | 8 gallons (30.3 liters) | |
| SubDrive300 | 20 gallons (75.7 liters) | |
| All flows | SubDrive2W | 20 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) |
| 25 | 18 |
| 30 | 21 |
| 35 | 25 |
| 40 | 28 |
| 45 | 32 |
| 50 (Factory Set) | 35 |
| 55 | 39 |
| 60 | 42 |
| 65 | 46 |
| 70 | 49 |
| 75 | 53 |
| 80 | 56 |
- 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 Dia | Max 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) |
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