Name: Press control with start/stop function PM2
Brand: Grundfos
Price: 203.49 EUR
Availability: InStock

Description
Reviews

Grundfos PM PLUS – pressure control with adjustable start pressure

Grundfos PM PLUS is a pressure control for automatic switching on and off of Grundfos and other water supply pumps in domestic systems. Thanks to the adjustable starting pressure, the device adapts to the specific installation, and the built-in dry-running protection protects the pump in case of water shortage.

Adjustable start . Switch-on setting from 1.5 to 3 bar.

Dry-running protection Stops the pump in case of water shortage and restarts automatically.

Built-in pressure gauge Pressure monitoring in the range 0–12 bar.

Description Design Approvals Pressure selection

Main advantages of PM PLUS

Automatic start/stop control of Grundfos and other water supply pumps.
Adjustable starting pressure to adapt to the specific installation.
Dry-running protection with automatic restart.
Automatic recovery of operation after a temporary power outage.
Built-in check valve.
Inner membrane and inner vessel for more stable operation.
Built-in pressure gauge with a measuring range of 0–12 bar.
Anti-jamming function.
Dual supply voltage 115/230 V.
Suitable for generator operation.
Light indication for power, pump operation and emergency.
RESET button to reset emergency indications.
Installation with or without a pressure vessel.

Applications

Water supply systems for single-family houses.
Residential buildings and small blocks.
Villas, summer houses and vacation properties.
Rainwater collection and use systems.
Gardening, irrigation systems and watering.
Agricultural applications with clean water.
Automation of surface, multistage and submersible pumps within the permissible power.

Suitable liquids

Clean water from the water supply network.
Rainwater without solid particles and fibers.
Clean, thin, non-aggressive and non-explosive liquids.

PM PLUS is not suitable for liquids with solid particles, fibers, aggressive chemicals or flammable liquids. For water from a well, borehole or rainwater tank with mechanical impurities, a suitable filter must be provided before the system.

Technical characteristics

Characteristics	Value
Product type	Pressure control / pressure manager for automatic pump control
Power supply	115/230V AC ±10%, 50/60Hz
Maximum current	10A
Maximum power at 115 V	0.75 kW / 1 hp
Maximum power at 230 V	1.5 kW / 2 hp
Maximum working pressure	12 bar
Adjustable starting pressure	1.5–3 bar
Minimum flow rate	Approximately 1 l/min
Liquid temperature	0–60°C
Ambient temperature	0–50°C
Degree of protection	IP65
Connection type	G1 / NPT, 1"
Pressure gauge	Built-in, 0–12 bar
Installation	Directly to the pump outlet or between the pump and the first point of consumption
Operation after a power outage	Automatic recovery after power is restored

LED indications and RESET

Power on The green indicator lights up continuously when the press control has power.

Pump on The yellow indicator lights up while the pump is in operation.

Alarm / RESET The red indicator flashes when running dry. The RESET button resets the indication after the cause has been eliminated.

Installation and operation

PM PLUS can be installed in a system with or without a pressure vessel. It is installed directly on the pump outlet or on the pipeline between the pump and the first point of consumption. When the pressure drops to the selected starting value, the pressure control turns on the pump. When consumption stops and the flow rate drops below the required level, the device controls the pump shutdown.

Before selecting, check the maximum power and current of the pump. At 230 V, they must not exceed 1.5 kW and 10 A. The system, fittings and pump must be suitable for a pressure of up to 12 bar.

Construction and components

The provided data sheet describes the functions and construction elements of the PM PLUS, but does not specify specific materials for the housing, diaphragm, valve and internal parts. Therefore, the table below only contains the confirmed components and their function.

Component	Function
Housing with IP65 protection rating	Protects electronic and hydraulic components from dust and water jets.
Built-in pressure gauge 0–12 bar	Allows visual control of the pressure in the installation.
Built-in check valve	Limits backflow to the pump and supports stable system operation.
Inner membrane	Helps limit short cycles and smoother response to pressure changes.
Inner court	It works together with the diaphragm to stabilize the pressure in the controller.
Electronic control unit	It controls the start/stop of the pump, monitors for lack of water and performs automatic restart.
Anti-blocking function	Helps limit the risk of system blockage during prolonged downtime.
LED indications	They show power, pump operation and alarm status.
RESET button	Used to reset emergency indications after the cause has been eliminated.
G1 / NPT connections	They allow connection to a water supply system with a 1" connection.

Practical advantages

Adjustability: The starting pressure is selected according to the height of the system and the required pressure at the consumers.
Pressure monitoring: The pressure gauge with a range of 0–12 bar allows for quick visual checks during setup and diagnostics.
Fewer external components: The device integrates control, dry-running protection, check valve, diaphragm, small internal vessel and pressure gauge.
Flexible installation: Suitable for direct installation to a pump or in the pipeline.

Dimensions

Size	Value
Total length (L)	200mm
Length L1	140mm
Length L2	60mm
Total width (W)	188 mm
Width W1	81 mm
Width W2	107 mm
Total height (H)	150mm
Height H1	70mm
Height H2	80mm
Input and output connection	G1

If exact materials of the body, diaphragm, check valve or connecting parts are required for a specific product page, these must be confirmed by additional official documentation for the exact product number. The provided sheet does not list materials by component.

Approvals and certificates

Grundfos PM PLUS has markings and approvals for electrical safety and use in drinking water systems, as specified in the supplied product sheet. [7]

Safety approvals

CE marking: Declares compliance with applicable European safety, health and environmental protection requirements.
TÜV Rheinland Certified: Certification by TÜV Rheinland is indicated for the specific product/performance.
cULus: North American safety compliance marking for Canada and the USA.

Drinking water approvals

NSF/ANSI 61: Approval for components used in drinking water systems.
NSF/ANSI 372: Compliance with requirements for low lead content in drinking water components.
ACS: French sanitary approval for contact with drinking water.

Why are they important?

Safety: Markings indicate that the product has been evaluated against applicable electrical safety and usage requirements.
Potable Water: NSF/ANSI 61, NSF/ANSI 372 and ACS are important in installations where the pressure control has contact with domestic water supply.
Compliance: For sites with regulatory requirements, it is important to check whether the specific product number is suitable for the market in which it is being installed.

Before installation or delivery for a specific project, check the markings and approvals for the exact product number and regional version. Available certifications may vary by market.

Starting pressure selection

PM PLUS allows the adjustment of the starting pressure according to the installation height and the required water supply comfort. The selected pump must provide at least the minimum pressure specified for the respective setting. [7]

Characteristics	1.5 bar	2 bar	2.5 bar	3 bar
Starting pressure	1.5 bar	2 bar	2.5 bar	3 bar
Approximate number of floors	Up to 5	Up to 6	Up to 8	Up to 10
Approximate height H	15 m	25 m	30 m	35 m
Minimum required pump pressure	3 bar	3.5 bar	4 bar	4.5 bar
Suitable for	Villas, houses and low-rise systems.	Medium-rise houses and buildings.	Taller buildings or systems with greater elevation.	Tall buildings and installations with the highest point of consumption up to about 35 m.

How to choose the setting?

1.5 bar: Suitable for low systems and highest point of consumption up to about 15 m above the pressure control. The pump must provide a minimum of 3 bar.
2 bar: Suitable for systems up to approx. 25 m high and up to approx. 6 floors. The pump must provide a minimum of 3.5 bar.
2.5 bar: Suitable for systems up to approx. 30 m high and up to approx. 8 floors. The pump must provide a minimum of 4 bar.
3 bar: Suitable for higher systems with a highest point of up to about 35 m and up to approximately 10 floors. The pump must provide a minimum of 4.5 bar.

Do not choose the starting pressure based only on the number of floors. Make a realistic check of the total required head: height between the water level and the highest point, desired pressure at the consumer and losses in pipes, fittings and filters. Also check that the total system does not exceed the maximum operating pressure of 12 bar.

The data is based on the supplied Grundfos PM PLUS product sheet. Please check the specific product number, electrical version, selected starting pressure and pump compatibility before ordering and installation.

Press control with start/stop function PM2

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Grundfos PM PLUS – pressure control with adjustable start pressure