Grundfos CM 5-4 A-R-A-E-AVBE C1-A-A-N Multistage Centrifugal Pump

The Grundfos CM 5-4 A-R-A-E-AVBE C1-A-A-N multistage centrifugal pump, reference 92880795, is a compact horizontal pump designed for water pumping in supply, pressurization, heating, water treatment, irrigation, and other hydraulic applications. It offers a nominal flow rate of 4.7 cubic meters per hour and a nominal head of 30.69 meters.

This model features 4 impellers and a single-phase asynchronous motor rated at 0.67 kilowatts, powered at 220-230 volts and 50 hertz. The construction combines stainless steel impellers, chambers, and shaft with cast iron inlet and outlet hydraulic components, providing a robust solution for professional hydraulic installations.

Grundfos CM 5-4 horizontal multistage centrifugal pump

The Grundfos CM 5-4 belongs to the CM family of horizontal multistage centrifugal pumps. Its configuration uses an axial suction inlet and a radial discharge outlet, with the hydraulic unit directly coupled to the motor.

The use of multiple stages makes it possible to generate a high discharge head while maintaining compact dimensions, making it especially suitable for installations where water pressure needs to be increased.

Nominal flow rate of 4.7 cubic meters per hour

The nominal operating point indicated for reference 92880795 is:

• Nominal flow rate: 4.7 cubic meters per hour.
• Nominal head: 30.69 meters.
• Number of impellers: 4.
• Speed used for hydraulic data: 2,900 revolutions per minute.
• Curve tolerance: ISO 9906:2012 class 3B.

The actual flow and pressure will depend on the operating point of the installation, the pipe friction losses, and the static head the pump must overcome.

0.67 kilowatt single-phase motor

The CM 5-4 92880795 incorporates a fan-cooled asynchronous single-phase motor mounted on bearings.

• Rated power P2: 0.67 kilowatts.
• Supply: 1 × 220-230 volts.
• Frequency: 50 hertz.
• Rated current: approximately 4.30-4.15 amperes.
• Rated speed: 2,810-2,830 revolutions per minute.
• Motor efficiency class: IE2.
• Protection rating: IP55.
• Insulation class: F.
• Motor size: 80B.
• Service factor: 1.00.

This version does not include an integrated frequency converter and is connected directly to the corresponding electrical supply.

Four stages to generate pressure

The CM 5-4 designation identifies a multistage pump with 4 impellers. Water passes successively through the different hydraulic stages, progressively increasing its pressure before leaving the pump through the discharge connection.

This design is especially suitable for systems that need to combine moderate flow with a discharge pressure higher than that normally provided by a single-stage centrifugal pump.

Stainless steel impellers and internal components

Grundfos uses stainless steel in the pump's main internal hydraulic components. The impellers are made of stainless steel EN 1.4301 / AISI 304, while the shaft and chambers are also made of stainless steel.

• Impellers: stainless steel.
• Impeller grade: EN 1.4301 / AISI 304.
• Chambers: stainless steel.
• Shaft: stainless steel.
• Hydraulic body: cast iron.
• Cast iron: EN-GJL-200 / ASTM A48-25A.

This combination provides a durable construction while keeping stainless steel in the internal elements directly related to the pumping stages.

AVBE mechanical seal

The pump incorporates a Grundfos mechanical seal with AVBE code. This is an O-ring seal specifically designed for this pump family.

• Primary seal: AVBE.
• Seal code: AVBE.

Correct selection of the mechanical seal is important to ensure compatibility with the liquid and the temperature and pressure conditions of the installation.

Maximum operating pressure of 10 bar

The CM 5-4 supports a maximum operating pressure of 10 bar, with limits depending on the liquid temperature.

• Maximum operating pressure: 10 bar.
• Maximum pressure at 40 degrees Celsius: 10 bar.
• Maximum pressure at 90 degrees Celsius: 6 bar.

The total pressure of the installation must take into account both the pressure at the suction side and the pressure generated by the pump itself.

Liquid temperature from -20 to 90 degrees Celsius

The pump is specified for operation with water within a wide temperature range:

• Indicated pumped liquid: water.
• Minimum liquid temperature: -20 degrees Celsius.
• Maximum liquid temperature: 90 degrees Celsius.
• Temperature used for hydraulic data: 20 degrees Celsius.
• Reference density: 998.2 kilograms per cubic meter.

For liquids with characteristics other than water or with additives, the compatibility of the materials and mechanical seal must be checked beforehand.

Ambient temperature up to 55 degrees Celsius

The pump can be installed in environments with temperatures between -20 and 55 degrees Celsius, always respecting the ventilation and mounting conditions established for the motor.

Rp threaded connections

Connection to the installation is made using Whitworth internal Rp threads according to ISO 7/1.

• Connection type: Rp.
• Suction connection: Rp 1 1/4.
• Discharge connection: Rp 1.
• Outlet position: 12.
• Connection code: R.

The axial suction and radial discharge allow the pump to be integrated into compact installations and simplify the usual piping layout.

Suitable for different hydraulic applications

Due to its hydraulic and construction features, the Grundfos CM 5-4 can be used in different types of installations where water needs to be transported or its pressure increased, including:

• Water supply and distribution systems.
• Installation pressurization.
• Heating systems.
• Water treatment.
• Irrigation.
• Fertigation and dosing applications associated with hydraulic systems.
• Water transfer in industrial installations.

The pump operating point should always be selected according to the required flow rate and the total head calculated for the installation.

Drinking water approvals

The technical sheet for this reference specifies ACS and NSF61 approvals for drinking water, in addition to the general CE, EAC, and UKCA approvals.

• Approvals: CE, EAC, and UKCA.
• Drinking water approvals: ACS and NSF61.

These certifications are especially relevant when the pump is integrated into installations where the pumped water must meet specific sanitary requirements.

Compact design for horizontal installation

The CM 5-4 is designed for horizontal mounting on a stable base. According to the dimensional drawing for reference 92880795, the total length of the assembly is approximately 362 millimeters, with a maximum width of approximately 158 millimeters.

During installation, sufficient space should be left around the motor to allow cooling and facilitate later inspection and maintenance operations.

Technical characteristics of the Grundfos CM 5-4 92880795

• Brand: Grundfos.
• Series: CM.
• Reference: 92880795.
• Model: CM 5-4 A-R-A-E-AVBE C1-A-A-N.
• Type: horizontal multistage centrifugal pump.
• Number of stages / impellers: 4.
• Nominal flow rate: 4.7 cubic meters per hour.
• Nominal head: 30.69 meters.
• Hydraulic reference speed: 2,900 revolutions per minute.
• Rated power P2: 0.67 kilowatts.
• Motor: fan-cooled asynchronous single-phase.
• Voltage: 1 × 220-230 volts.
• Frequency: 50 hertz.
• Rated current: 4.30-4.15 amperes.
• Motor efficiency class: IE2.
• Protection rating: IP55.
• Insulation class: F.
• Integrated frequency converter: no.
• Mechanical seal: AVBE.
• Impellers: AISI 304 stainless steel.
• Hydraulic body: EN-GJL-200 cast iron.
• Maximum operating pressure: 10 bar.
• Maximum pressure at 90 degrees Celsius: 6 bar.
• Liquid temperature range: from -20 to 90 degrees Celsius.
• Ambient temperature range: from -20 to 55 degrees Celsius.
• Suction connection: Rp 1 1/4.
• Discharge connection: Rp 1.
• Drinking water approvals: ACS and NSF61.
• General approvals: CE, EAC, and UKCA.
• Curve tolerance: ISO 9906:2012 class 3B.
• Approximate total length: 362 millimeters.
• Net weight: 14.5 kilograms.
• Gross weight: 17 kilograms.

Compact multistage pump for pressurization and water transfer

The Grundfos CM 5-4 A-R-A-E-AVBE C1-A-A-N 92880795 combines a nominal flow rate of 4.7 cubic meters per hour with a nominal head of 30.69 meters and a 0.67 kilowatt single-phase motor, offering a compact solution for installations that need to transport water and increase its pressure.

Its four stages, stainless steel impellers, 10 bar maximum pressure, IP55 protection, Rp threaded connections, and ACS and NSF61 approvals make it suitable for a wide variety of residential, professional, and industrial hydraulic installations, always within the operating conditions specified by Grundfos.