1. General Information
Read this document before installing the product. Local regulations and recognized best practices must be observed during installation and operation.
This appliance can be used by children aged 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved.
Children must not play with the appliance. Cleaning and user maintenance must not be carried out by children without supervision.
1.1 Declaration of Hazards
Symbols and hazard statements below may appear in Grundfos product installation and operating instructions, and in safety and service instructions.
Hazard statements are structured as follows: SIGNAL WORD - Description of hazard - Consequences of ignoring the warning - Action to prevent the hazard.
1.2 Notes
Symbols and notes below may appear in Grundfos product installation and operating instructions, and in safety and service instructions.
2. Product Receipt
2.1 Package Inspection
Upon receipt of the product, do the following:
- Check that the product matches the order. If not, contact the supplier.
- Check for visible damage. If any visible damage is present, contact the shipping company.
2.2 Scope of Delivery
The box contains the following items:
- 1 pump
- 1 adapter
- 1 installation and operating instructions manual
- 1 quick guide
- 1 floating suction strainer (side inlet variant only)
- 1 check valve (SB only)
3. Product Installation
3.1 Placement
The pump must be placed in a frost-free location.
Before immersing the pump in a well or tank, ensure that the well or tank does not contain sand or solid deposits.
Install piping so that it is not subjected to mechanical stress.
3.1.1 Maximum Installation Depth
Refer to the product label.
| Product | Maximum Installation Depth [m] |
|---|---|
| SB | 10 |
| SBA | 10 |
3.1.2 Highest Discharge Point for SBA Pumps
SBA pumps should be installed so that the height between the unit and the highest discharge point does not exceed:
- SBA 3-35: 13 m (43 ft)
- SBA 3-45: 20 m (66 ft)
Diagram description: Two illustrations show SBA pumps installed in a tank. For SBA 3-35, the maximum discharge height is 13m/43ft. For SBA 3-45, the maximum discharge height is 20m/66ft. The pump is submerged in the tank, and the discharge pipe extends upwards to a higher point.
3.1.3 Minimum Space
Pumps installed with a float switch require free space between the float switch and the wall to allow for free movement.
Pumps with a side inlet require free space between the suction strainer and the wall.
If installing the pump in a well or tank, the minimum free space must correspond to the values in the diagram below.
Pumps installed without a float switch require space corresponding to the physical dimensions of the pump.
Diagram description: An illustration shows a submerged pump (SB or SBA) with a float switch and side inlet. Minimum clearance from the float switch to the wall is 15 cm (2 inches). Minimum clearance from the suction sieve to the wall is 10 cm (4 inches).
3.1.4 Float Switch Adjustment
To enable the float switch to switch the pump on and off, the switch-on and switch-off levels can be adjusted by changing the free cable length between the float switch and the lifting handle.
- A shorter free cable length will result in a higher switching frequency of the pump and a smaller difference between levels. The minimum free cable length is 10-18 cm (4-7 inches).
- A longer free cable length will result in a lower switching frequency of the pump and a larger difference between levels.
Check that the float switch can move freely.
Ensure that the switch-off level is not lower than the position of the pump's suction strainer.
Diagram description: An illustration shows the float switch cable attached to the pump handle. The adjustable free cable length is indicated as 10-18 cm / 4-7 inches.
3.2 Mechanical Installation
3.2.1 Lifting the Product
Lift the pump by the lifting handle. Never lift the pump by the power cable. Instead, you can tie a rope to the handle or lifting eye.
Diagram description: Illustrations show the correct way to lift SB and SBA pumps using the lifting handle or a rope tied to it (indicated by a checkmark), and the incorrect way to lift by the power cable (indicated by an 'X').
3.3 Pump Position
3.3.1 Pump Position SB and SBA
Use the pump in a vertical position, as shown in the diagram.
Diagram description: An illustration shows a pump in a vertical position (0 degrees) with an acceptable tilt up to 15 degrees. A horizontal position (90 degrees) is marked as incorrect with an 'X'.
3.4 Connecting Discharge Hose or Pipe
The discharge pipe can be connected to the pump's discharge port using a connecting adapter. The pipe can also be connected directly to the pump's discharge port.
SB and SBA pumps include an adapter. Cut the adapter to match the diameter of the discharge pipe.
| Product | External Pipe Thread [inches] |
|---|---|
| SB | G 3/4" or 1" |
| SBA | G 3/4" or 1" |
Diagram description: Illustrations show two types of discharge pipe connections: one for 3/4" and one for 1" pipe, both connecting to the pump's discharge port.
3.5 Check Valve for SB Pumps
Connect the check valve to the discharge port of the SB pump. The check valve has G 1" threads for connection to the adapter or the pump.
Diagram description: An illustration shows a check valve being connected to the pump's discharge port.
3.6 Electrical Connection
Check that the power supply voltage and frequency comply with the electrical values stated on the pump's type plate.
Electrical connection must be performed exclusively by a qualified electrician in accordance with local regulations.
3.6.1 Thermal Protection
The pump has a built-in thermal switch, so no additional motor protection is required. If the pump runs dry or is overloaded in any other way, the built-in thermal switch will turn off the pump. The motor will restart automatically after cooling down to normal temperature.
3.6.2 Connection to External Control Unit
SB
SB pumps must be connected to an external control unit. Grundfos recommends the Grundfos Pressure Manager pressure control unit: net.grundfos.com/qr/i/97506325
SBA
SBA pumps have an integrated control unit.
3.6.3 Power Failure
In case of a power failure, the pump will automatically restart if the power supply is restored for at least 10 seconds.
4. Product Start-up
- Open the tap in the system.
- Switch on the power supply.
- Check that the pump is running and water is flowing from the tap.
- Check that the pump is running and the system is pressurized.
- Close the tap.
- Check that the system is pressurized.
- Check that the pump stops after 10 seconds.
Water accumulates between the motor casing and the cover when submerged. When you stop the pump and lift it from its submerged position, water will drain from the discharge holes located under the red ring.
Diagram description: An illustration shows water draining from the pump's discharge holes, located under a red ring, when the pump is stopped and lifted above the water level. This is a normal occurrence.
4.1 SBA Start-up and Stop Conditions
If water in the supply system is consumed, the pump will switch on if the switch-on conditions are met. Switch-on conditions will be met, for example, when an open tap causes the system pressure to drop. The control unit will stop the pump again when consumption stops, i.e., when the tap is closed.
Switch-on Conditions
The pump starts if one of the following conditions is met:
- Flow is higher than the minimum flow.
- Pressure is lower than the switch-on pressure.
Switch-off Conditions
If a flow lower than the minimum is detected, the pump will stop with a 10-second delay.
Switch-on pressure and minimum flow values are given in the Pressure and Flow chapters.
Automatic Restart of SBA Pumps
SBA pumps with a float switch automatically restart when the water level rises. Models without a float switch attempt to restart every 24 hours.
5. Product Handling and Storage
5.1 Product Handling
5.2 Product Storage
Store the product indoors in a dry and dust-free environment. Protect the product from vibrations.
Storage temperature: -10 to +40 °C.
5.3 Frost Protection
If the pump is not used during freezing temperatures, drain the pump and piping system before taking the pump out of service.
6. Product Introduction
6.1 Product Description
Pumps are submersible pressure-boosting pumps and are available in two versions:
- Pump with integrated suction strainer with 1 mm mesh.
- Pump with side inlet, which includes a flexible inlet hose with a floating suction strainer with 1.8 mm mesh.
Both versions are available with or without a float switch. The float switch can be used for automatic operation or as dry-running protection.
6.2 SB Pumps
The SB submersible pump for pressure boosting is available with a built-in suction strainer or a floating suction strainer. The SB pump must be connected to an external control unit.
6.3 SBA Pumps
The SBA submersible pump for pressure boosting is available with a built-in suction strainer or a floating suction strainer.
The SBA pump includes a built-in control unit, so no external control unit is required.
The pump has built-in overheat protection.
6.4 SBA Dry-running Protection
The built-in control unit includes dry-running protection, which automatically stops the pump in case of dry running.
The dry-running protection function differs during pump priming and during normal operation.
6.4.1 Dry-running Protection During Priming Phase
If the unit detects a no-pressure and no-flow condition for 5 minutes after connecting to the power supply and the pump has started, the dry-running protection function is activated and the pump stops.
6.4.2 Dry-running Protection During Normal Operation
If the control unit does not detect any pressure or flow during 40 seconds of normal operation, the dry-running protection function is activated and the pump stops.
6.4.3 Resetting Dry-running Alarm
If a dry-running alarm has been activated, you can restart the pump manually by switching off the power supply, waiting 2 minutes, and then reconnecting the power. If the unit detects no pressure or flow for 40 seconds after restart, the dry-running alarm will be activated again.
6.5 Intended Use
Grundfos SB and SBA pumps are designed for pumping clean water. The pumps are particularly suitable for pumping rainwater and for small private wells.
Typical applications:
- Normal wells
- Shallow wells
- Rainwater harvesting in tanks
- Water pressure boosting from public water supply
- Draining garden ponds
- Irrigation systems
6.6 Pumped Liquids
Pumps are designed for potable water with a maximum chloride content of 300 ppm and free chlorine content below 1 ppm.
This product is suitable for pumping thin, clean, non-aggressive, and non-explosive liquids without solid or fibrous impurities.
Pumps are not suitable for the following liquids:
- Liquids containing long-fibered components
- Flammable liquids (oil, gasoline, etc.)
- Aggressive liquids
6.7 Identification
6.7.1 Type Plate
Example of a type plate with corresponding descriptions:
| Pos. | Description |
|---|---|
| 1 | Product type |
| 2 | Frequency [Hz] |
| 3 | Production code (year and week) |
| 4 | 50 Hz, P1: Electrical power [W]; 60 Hz, P2: Motor power [HP] |
| 5 | Serial number |
| 6 | Full load current [A] |
| 7 | Max. installation depth [m] |
| 8 | Max. liquid temperature [°C] |
| 9 | Enclosure class |
| 10 | Manufacturer |
| 11 | Motor insulation class |
| 12 | Max. delivery head [m] |
| 13 | Country of origin |
| 14 | Markings |
| 15 | Max. flow [l/min] |
| 16 | Supply voltage [V] |
| 17 | Order number |
7. Product Maintenance
If necessary, clean the strainer with a brush and running water. During normal operation, the pump does not require any specific maintenance.
8. Product Troubleshooting
See also the quick guide.
8.1 Pump Does Not Work
| Cause | Remedy |
|---|---|
| Fuses in the electrical installation have blown. | Replace fuses. If a new fuse also blows, check the electrical installation and power cable. |
| Residual current circuit breaker (RCCB) has tripped. | Activate the circuit breaker. |
| Power supply interrupted. | Contact the power supplier. |
| Pump motor protection has switched off the pump's power supply due to overload. | Check if the pump is blocked.
Note: Remember to reinstall the rubber plug. |
| Pump or power cable is damaged. | Repair or replace the pump or cable. |
| Float switch is in dry-running position. | Check the water level and the free movement of the float switch. Note: If the tank is empty and the float switch is often in this position, install a larger tank. |
| SBA: Pump dry-running protection has stopped the pump. | Check the water level. Switch off the power supply, wait 2 minutes, and switch it on again. |
| Pump is blocked. | Check and clean the pump.
|
8.2 Pump Works, But Does Not Pump Any Liquid
| Cause | Remedy |
|---|---|
| Valve on the discharge side is closed. | Open the valve. |
| No water in the tank or low water level. | Increase the installation depth of the pump. Reduce the pump's performance or replace the pump with one with lower performance. |
| Check valve is blocked in the closed position. | Remove the pump and clean or replace the valve. |
| Suction pipe is clogged. | Remove the pump and clean the suction strainer with a brush and running water. |
| Pump is faulty. | Repair or replace the pump. |
8.3 Pump Works With Reduced Performance
| Cause | Remedy |
|---|---|
| Valves in the discharge pipe are partially closed or blocked. | Check and clean or replace the valves. |
| Discharge pipe is partially clogged with debris. | Clean or replace the pipe. |
| Check valve in the discharge pipe is partially clogged. | Clean or replace the valve. |
| Pump and discharge pipe are partially clogged with debris. | Remove the pump. Check and clean or replace the pump. Clean the pipe. |
| Suction pipe is clogged. | Clean the inlet strainer. |
| Pump is faulty. | Repair or replace the pump. |
| Leakage in the pipe. | Check and repair the pipe. |
| Discharge pipe is faulty. | Replace the discharge pipe. |
| Undervoltage. | Check the power supply voltage. |
8.4 Frequent Starting and Stopping
| Cause | Remedy |
|---|---|
| Float switch not set correctly. | Adjust the float switch to ensure a suitable time between pump on and off. |
| Check valve is leaking or blocked in a partially open position. | Clean or replace the check valve. |
| Power supply is unstable. | Check the power supply voltage. |
| Motor temperature is too high. | Check the water temperature. |
| Pump is blocked. | Check and clean the pump.
|
| Leakage in the pipe. | Check and repair the pipe. |
8.5 Water Leakage from Discharge Holes
| Cause | Remedy |
|---|---|
| Water drains from the discharge holes located under the red ring when you stop the pump and the discharge holes are above the water level. | This is a normal condition. |
9. Technical Data
9.1 Operating Conditions
9.1.1 Flow
| Product | Max. Flow [m³/h] |
|---|---|
| SB | 3 |
| SBA | 3 |
| Product | Min. Flow [l/min] |
|---|---|
| SBA 3-35 | 1.0 |
| SBA 3-45 | 1.0 |
9.1.2 Max. Delivery Head
| Product | [m] |
|---|---|
| SB 3-35 | 35 |
| SB 3-45 | 45 |
| SBA 3-35 | 35 |
| SBA 3-45 | 45 |
9.1.3 Temperature
| Liquid Temperature | [°C] |
|---|---|
| SB | 0 to 40 |
| SBA | 0 to 40 |
| Storage Temperature | [°C] |
|---|---|
| SB | -10 to +40 |
| SBA | -10 to +40 |
9.1.4 Pressure
| Switch-on Pressure | [bar] | [MPa] |
|---|---|---|
| SBA 3-35 | 1.5 | 0.15 |
| SBA 3-45 | 2.4 | 0.22 |
9.1.5 Switching Frequency
| Maximum Starts Per Hour | |
|---|---|
| SB | 20 |
| SBA | 20 |
9.2 Mechanical Data
| Cable Length | [m] |
|---|---|
| SB | 15 |
| SBA | 15 |
| Maximum Installation Depth | [m] |
|---|---|
| SB | 10 |
| SBA | 10 |
| Protection Class | |
|---|---|
| Enclosure class | IP68 |
| Insulation class | F |
9.3 Electrical Data
| Voltage [V] | Frequency [Hz] | P1 [kW] | P2 [kW] | I1/1 [A] | |
|---|---|---|---|---|---|
| 3-35 | 1 × 230 | 50 | 0.70 | 0.47 | 3.35 |
| 3-45 | 0.80 | 0.55 | 3.60 | ||
| 3-35 | 1 × 115 | 60 | 0.66 | 0.45 | 6.30 |
| 3-45 | 0.85 | 0.62 | 7.70 | ||
| 3-35 | 1 × 230 | 0.70 | 0.48 | 2.70 | |
| 3-45 | 0.76 | 0.57 | 3.40 |
| Voltage [V] | Frequency [Hz] | P1 [kW] | P2 [kW] | I1/1 [A] | |
|---|---|---|---|---|---|
| 3-35 | 1 × 230 | 50 | 0.72 | 0.47 | 3.3 |
| 3-45 | 0.78 | 0.55 | 3.6 | ||
| 3-35 | 1 × 115 | 60 | 0.66 | 0.45 | 6.4 |
| 3-45 | 0.84 | 0.62 | 7.8 | ||
| 3-35 | 1 × 230 | 0.70 | 0.47 | 3.3 | |
| 3-45 | 0.76 | 0.57 | 3.4 |
9.3.1 Speed
| Speed | 50 Hz [min⁻¹] | 60 Hz [min⁻¹] |
|---|---|---|
| SB | 2800 | 3400 |
| SBA | 2800 | 3400 |
10. Further Product Information
Further product documentation can be found on the Grundfos product selection website: product-selection.grundfos.com.
11. Product Disposal
Disposal of this product or its components must be carried out in accordance with environmental protection principles.
- Disposal should be carried out by an authorized waste collection service.
- If no local collection service exists or cannot handle the materials used in the products, transport the product or any hazardous materials from its components to the nearest Grundfos branch or service center.
The crossed-out wheeled bin symbol on the product means that it must be disposed of separately from household waste. When a product marked with this symbol reaches the end of its life, take it to a collection point designated by local authorities for waste disposal. Separate collection and recycling of these products helps protect the environment and human health.
See also end-of-life information at www.grundfos.com/product-recycling.
