In this module, we’ll explore the different external control unit options available for the SB submersible pressure booster pump. Let’s get started.

For the SB pump, Grundfos recommends external control units either the PM START or the PM PLUS pressure managers. These all-in-one controllers are designed to work with domestic water supply pumps from Grundfos as well as other brands.

Both the PM START and the PM PLUS work by automatically starting a pump, such as the SB, at a preset cut-in pressure point and keeping it running for as long as there is sufficient water flow. The PM START and PM PLUS can be used in a wide range of domestic water supply or rainwater systems, including:

Single-family homes

Blocks of flats

Summer houses and holiday cottages

Horticulture and gardening

Agriculture

Let’s take a closer look at the PM START. The PM START is designed for start/stop control of pumps such as the SB submersible pressure booster pump, supporting liquid temperatures up to 60°C.

It offers simple installation and includes an integrated check valve for simple connection. Available in 1.5 and 2.2 bar models, … the PM START will start the pump when the respective fixed cut-in pressure is reached and keep it running as long as there’s a sufficient flow of water. It also provides dry-running protection, automatically stopping the pump in case of water shortage to prevent damage. If there’s a power outage, operation will automatically resume once power has been restored. "

Now let’s look at the PM PLUS. The PM PLUS has a simple, user-friendly interface and offers the same benefits like PM Start, plus these additional features:

Adjustable cut-in pressure, advanced dry-running protection, an integrated pressure gauge, auto-restart, and anti-jamming.

Designed for advanced control, it has a wider operating range, allowing you to set the cut-in pressure anywhere between 1.5 and 3 bar, so you can customise the PM PLUS to your specific needs.

When connected to the SB pump, it will start at the chosen cut-in pressure and continue running for as long as there is sufficient flow. The anti-jamming function briefly activates the pump every 24 hours if no activity is detected.

This helps prevent the impellers and mechanical seal from sticking, reduces the risk of obstructions in the system, and minimises the need for manual intervention or maintenance. That covers the key external control unit options available for the Grundfos SB submersible pressure booster pump and the main features of each controller.