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Inverter booster pump CMBE

Inverter booster pump CMBE
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Inverter booster pump CMBE


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1,457.18€
Ex Tax: 1,457.18€
  • Stock: In Stock
  • Brand: Grundfos
  • Model: 98374697
  • Weight: 16.00кг
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Grundfos CMBE – constant pressure inverter booster pump

Grundfos CMBE is a compact multistage booster pump with electronic control and integrated frequency converter. It adjusts the motor speed according to the current water demand to maintain a stable pressure in the system and reduce electricity consumption at part load.

Constant pressure Automatically adapts the speed to water consumption.
Inverter control Built-in frequency converter for smooth and efficient operation.
Compact design Multistage horizontal pump for easy installation and maintenance.

Main advantages of Grundfos CMBE

  • Integrated frequency converter for smooth speed control.
  • Maintaining constant pressure with variable water consumption.
  • Multi-stage centrifugal design for high pressure and stable operation.
  • Permanent magnet motor for high energy efficiency.
  • Electronic MGE motor with control and monitoring capabilities.
  • Possibility to connect an external pressure sensor.
  • Reduced noise level at partial load as the motor operates at lower speeds.
  • Lower electricity consumption in variable flow systems.
  • Smooth acceleration and reduced hydraulic load at start-up.
  • Compact horizontal design with low installation height.
  • High-performance hydraulics and mechanical shaft seal.
  • Ability to communicate, monitor and adjust via compatible Grundfos solutions.

How does an inverter booster pump work?

When a tap is opened, a shower, an irrigation system or another consumer is turned on, the pressure in the installation begins to change. CMBE receives information from a pressure sensor and, using the integrated frequency converter, increases or decreases the motor speed. This way, the pump delivers only the amount of water needed at the moment and maintains the set pressure more stably compared to a fixed-speed pump.

Applications

  • Pressure boosting in single-family houses, villas and apartment buildings.
  • Water supply to sanitary facilities, kitchens, bathrooms and garden systems.
  • Irrigation of gardens, parks and small agricultural systems.
  • Transfer and pressure boosting of drinking and process water.
  • Water treatment systems – filtration, softening, ionization and demineralization.
  • Washing and cleaning systems.
  • Car washes, washing systems and CIP applications.
  • Temperature control, cooling and circulation systems.
  • Cooling of electronic, medical and industrial equipment.
  • Small commercial and industrial applications with variable consumption.

Suitable liquids

  • Clean water and non-aggressive aqueous solutions.
  • Drinking water and process water with appropriate material implementation.
  • Water for irrigation, filtration, softening and technological systems.
  • Aqueous solutions with cleaning agents, when materials and seals are adapted to the specific fluid.
The selection of a specific material, seal and O-rings must be based on the working fluid, temperature, pressure and chemical composition. The pump must not be used for fluids containing solids, long fibres, highly abrasive or incompatible chemicals without prior technical inspection.

General technical features

Characteristics Description
Pump type Horizontal multistage centrifugal booster pump
Management Integrated frequency converter for variable speed
Engine Grundfos MGE permanent magnet motor with electronic control
Motor energy efficiency IE5 according to IEC 60034-30-2
Efficiency of the motor + frequency converter system IES2 according to IEC 50598-2
Control Speed regulation according to consumption and setpoint
Pressure sensor Possibility to connect an external sensor for constant pressure operation
Construction Compact, close-coupled, with axial inlet and radial outlet
Shaft seal Maintenance-free mechanical O-ring shaft seal with fixed guide
Motor protection degree IP55 in standard versions
Installation On a flat and stable base, with access for servicing and good ventilation
Maximum start/stop frequency Up to 100 on/off cycles per hour

Installation guidelines

  • Install the pump on a flat, stable and immovable base.
  • Provide access for inspection, maintenance and service.
  • Install the pump in a well-ventilated room.
  • Install the piping system so that no air pockets form in the pump housing and pipes.
  • For outdoor installation, provide a protective cover against sun, precipitation and condensation.
  • When operating with variable flow, it is recommended to correctly position the pressure sensor after the pump.
  • Check inlet conditions and NPSH, especially at high temperature, long suction line, high flow rate or suction from depth.
To avoid cavitation, always check the available inlet pressure, suction pipe length and diameter, water temperature and NPSH requirements of the selected model.

Construction and materials

The CMBE series is based on the Grundfos CM/CME multistage pump design. The material execution can vary depending on the specific model – cast iron, stainless steel AISI 304 or stainless steel AISI 316.

Component Material / execution Practical importance
Pump housing and inlet and outlet parts Cast iron EN-GJL-200, stainless steel EN 1.4301 / AISI 304 or EN 1.4401 / AISI 316 depending on the variant Allows selection according to environment, working fluid and corrosion resistance requirements.
Shaft Stainless steel; in certain versions AISI 304 or AISI 316 Corrosion resistance and reliable operation of multi-stage hydraulics.
Impellers and chambers Stainless steel EN 1.4301 / AISI 304 or EN 1.4401 / AISI 316 depending on the variant High efficiency, wear resistance and stable pressure performance.
Shaft seal Mechanical O-ring seal with fixed guide; various combinations available depending on fluid and temperature It limits leaks and is an important element for the long life of the pump.
Elastomers and O-rings EPDM, FKM or FFKM depending on the design Fluid compatibility is important with hot water, oils, chemicals or specific process environments.
Engine Grundfos MGE permanent magnet motor with integrated electronics High efficiency and possibility of speed regulation.
Frequency converter Integrated into the MGE engine Controls the speed and allows adaptation of performance to the needs of the system.
Base Low-profile mounting base Compact and stable attachment to a flat base.

How to choose the material performance?

  • Cast iron version: Suitable for standard applications with clean water and normal conditions.
  • Stainless steel AISI 304: Suitable for drinking water, water supply, water treatment and most standard water applications.
  • Stainless steel AISI 316: Suitable for higher corrosion resistance requirements and certain more aggressive environments.
  • EPDM gaskets: Often used with water and aqueous solutions.
  • FKM/FFKM seals: Used for specific fluids, temperatures and chemical requirements after technical verification.
The exact material code of the CMBE model should be checked by product number. Do not select the version only by series if the pump will be working with chemicals, water with high salt content, high temperature or non-standard liquid.

Approvals and effectiveness

The CME base series is designed for international use and is available with approvals and markings according to the specific electrical and material performance. The specific certifications depend on the product number, market and options selected. [9]

Marking / standard Meaning
CE Compliance with applicable European safety, health and environmental protection requirements.
IEC 60034-30-2, class IE5 Energy efficiency class of the permanent magnet motor with electronic control.
IEC 50598-2, class IES2 Efficiency class of the combined motor and frequency converter system.
EuP / MEI Energy-optimized hydraulics according to applicable European Union requirements for water pump efficiency.
IP55 Degree of protection of standard MGE motors; for condensing environments, a suitable design or protected installation is required.
UL NEMA 3R Specified for three-phase CME motors; applicability is checked on the specific implementation.

Why does inverter control save energy?

  • The pump does not run continuously at maximum speed when maximum flow is not needed.
  • When consumption is reduced, the electronics reduce the engine speed.
  • Lower speeds mean lower consumption, less noise and lower hydraulic losses.
  • Constant pressure increases comfort when using several consumers simultaneously.
  • Smooth regulation reduces frequent abrupt starts and stops typical of standard fixed speed systems.
Before delivery to a site with drinking water requirements, industrial environments or specific regulatory documentation, check the certificates of the exact product number in the Grundfos Product Center or in the supplier's documents.

How to choose a CMBE model?

The specific CMBE model is selected based on the required flow rate, total head, number of simultaneously operating consumers, available inlet pressure and required constant pressure. The model designation usually indicates the nominal flow and head series of the pump, but the final selection should be based on the duty point, not just the model name.

CMBE 1 Series For lower flow rates and smaller systems – compact installations, single consumers, small water supply systems and applications with higher required head.
CMBE 3 Series For standard domestic systems, houses with multiple points of consumption, smaller commercial properties and medium-sized irrigation systems.
CMBE 5 Series For higher flow rates – larger houses, more sanitary points, irrigation systems and small commercial properties.
CMBE 10, 15 and 25 series For larger water supply, process, irrigation and industrial systems with high flow requirements.
The number after the dash indicates the number of impellers/stages and therefore the head potential. A higher value usually means a higher possible head for the same series.
Material option Choose standard, AISI 304 or AISI 316 option according to water, environment and corrosion resistance requirements.

What data is needed for an accurate choice?

Parameter What needs to be specified? Why is it important?
Required flow rate How many m³/h or l/min are needed when the consumers operate simultaneously? Determines the pump series – CMBE 1, 3, 5, 10, etc.
Geodetic height The height difference between the water source/pump and the highest consumer. Determines part of the required pressure.
Desired pressure The pressure to be maintained at the farthest point. Determines the constant pressure setting.
Pipe losses Length, diameter, fittings, filters, softeners, valves and other resistances. They must be added to the total required head.
Inlet pressure The pressure before the booster pump or the water level at suction. Important for the correct operating point, cavitation protection and maximum allowable pressure.
Working fluid Pure water, drinking water, process water, temperature, pH, salts and chemical content. Determines the required materials, seals and permissible temperature.
Once you add the exact CMBE models as options in the store, send me their names and product numbers. I will then make a specific comparison table with flow, head, power, connection and a short technical text for each option, without using approximate values.

The description is based on the provided catalogue for Grundfos CM/CME – the series on which the CMBE inverter booster concept is based. The specific flow, head, power, supply, materials, seals and approvals depend on the exact CMBE product number. Check the duty point and technical documentation before ordering and installation.

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