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

The Grundfos CM 5-5 A-R-A-E-AVBE C1-A-A-N multistage centrifugal pump, reference 92880796, is a compact horizontal pump designed for water pumping and pressure boosting. It features 5 impellers, delivers a nominal flow rate of 4.7 cubic meters per hour and a nominal head of 38.61 meters, combining a robust hydraulic body with stainless steel internal components.

It is equipped with a single-phase asynchronous motor of 0.9 kilowatts for 220 to 230 volt, 50 hertz power supply. Its horizontal construction, axial suction and radial discharge make it suitable for domestic, commercial and industrial installations where water needs to be transferred or available pressure increased.

Grundfos CM 5-5 horizontal multistage centrifugal pump

The Grundfos CM range consists of compactly built multistage centrifugal pumps. In reference 92880796, the liquid enters through an axial suction port and passes successively through the different hydraulic stages before exiting through a radial discharge connection.

The multistage design makes it possible to generate high pressure while maintaining a reduced size, making it suitable for installations where moderate flow must be combined with considerable discharge head.

Nominal flow rate of 4.7 cubic meters per hour

The nominal operating point specified for this pump corresponds to a flow rate of 4.7 cubic meters per hour and a head of 38.61 meters.

The hydraulic curve of the CM 5-5 allows its operation to be adapted to different combinations of flow and pressure within its working range. As a reference, specialized technical distributors indicate an approximate maximum flow rate of 6.1 cubic meters per hour and a maximum head close to 48 meters.

5 stages to generate higher pressure

The pump has 5 impellers arranged in series. In a multistage pump, each stage progressively increases the pressure of the liquid, allowing higher heads to be achieved than would normally be provided by a single-stage centrifugal pump of similar dimensions.

This configuration is suitable for pressure boosting, distribution and water transfer applications where it is necessary to overcome differences in level or high head losses.

Stainless steel impellers and hydraulic components

The impellers are made of EN 1.4301 stainless steel, equivalent to AISI 304. The shaft and hydraulic chambers also use stainless steel, providing mechanical strength and corrosion resistance in compatible water applications.

The suction and discharge parts are made of EN-GJL-200 cast iron, equivalent to ASTM A48-25A, providing a robust construction to withstand the pressure conditions of the installation.

AVBE mechanical seal

Reference 92880796 uses a mechanical seal with AVBE code. This is an unbalanced O-ring seal designed specifically for the range.

The rotating face of the seal uses aluminum oxide or alumina, while the stationary face uses carbon graphite impregnated with resin. The secondary seal is made of EPDM, a material especially suitable for water and hot water applications.

Grundfos indicates that this combination of materials offers good sealing and wear resistance in compatible applications. EPDM is not suitable for pumping mineral oils.

0.9 kilowatt single-phase motor

The pump incorporates a fan-cooled single-phase asynchronous motor with a nominal output power P2 of 0.9 kilowatts.

The nominal supply is 1 × 220-230 volts at 50 hertz, so this version is especially suited to installations with single-phase electrical supply.

IE2 efficiency motor

The motor has an IE2 efficiency class in accordance with IEC 60034-30 and construction characteristics compliant with the standards applicable to motors in the range.

The nominal speed is approximately between 2,790 and 2,810 revolutions per minute, while the pump hydraulic data have been established using a reference speed of 2,900 revolutions per minute.

IP55 protection and class F insulation

The motor has an IP55 protection rating, providing protection against harmful dust ingress and against water jets under the conditions established for this classification.

The insulation class is F and the motor includes PTO thermal protection. The power cable is not included with the pump.

Rated current

The rated current indicated by Grundfos is between 5.72 and 5.60 amperes, depending on the supply voltage within the nominal range of 220 to 230 volts.

The starting current is approximately between 400 and 440 percent of the rated current, a figure that must be taken into account to correctly size the electrical protection devices and switching elements.

Maximum working pressure of 10 bar

The Grundfos CM 5-5 is designed to operate with a maximum service pressure of 10 bar within the temperature conditions defined by the manufacturer.

Grundfos specifically states a maximum pressure of 10 bar at 40 degrees Celsius. When the liquid temperature reaches 90 degrees Celsius, the maximum permissible pressure is reduced to 6 bar.

Liquid temperature from -20 to 90 degrees Celsius

The pumped liquid temperature range is between -20 and 90 degrees Celsius. This allows the pump to be used with both cold and hot water within the operating, pressure and material conditions established by the manufacturer.

The technical documentation uses water at 20 degrees Celsius and an approximate density of 998.2 kilograms per cubic meter as the reference for the published performance data.

Ambient temperature from -20 to 55 degrees Celsius

The pump can operate with an ambient temperature between -20 and 55 degrees Celsius, always respecting the installation and ventilation conditions required for the motor.

Rp threaded connections

The hydraulic connection is made using internal Whitworth pipe threads Rp in accordance with ISO 7/1, making it easy to integrate into conventional threaded installations.

• Suction connection: Rp 1 1/4 inch.
• Discharge connection: Rp 1 inch.
• Suction configuration: axial.
• Discharge configuration: radial.

The difference in diameter between suction and discharge is due to the specific hydraulic design of this CM 5-5 version.

Compact design for limited spaces

The pump and motor form a compact unit mounted on a small base frame. This configuration simplifies installation and allows the assembly to be placed in technical rooms and spaces where available floor area is limited.

The dimensional drawing for reference 92880796 indicates an approximate overall length of 400 millimeters. Before installation, sufficient space should be left for hydraulic connections, motor ventilation and future maintenance operations.

Accessible maintenance

The CM range design allows access to the hydraulic components from the pump end. The chambers, suction and discharge are held together by four threaded tie rods.

Grundfos designs this range to facilitate service operations and provides spare parts and specific kits for different components of the hydraulic assembly.

Suitable for potable water applications

The technical documentation for this reference includes ACS and NSF61 approvals for potable water, as well as the general CE, EAC and UKCA certifications.

Final compatibility with potable water must be maintained by using accessories, piping and other components that are also suitable for this use and by complying with the conditions established by the installation regulations.

Applications of the Grundfos CM 5-5 pump

Thanks to its multistage construction and combination of flow and pressure, the Grundfos CM 5-5 can be used in different water transfer and pressure boosting installations compatible with its characteristics.

• Pressure boosting in water installations.
• Water transfer and distribution.
• Supply systems.
• Commercial and industrial installations.
• Auxiliary equipment and systems requiring water pumping.
• Potable water applications compatible with its certifications.

The pump does not include a frequency converter, so this version operates at fixed speed when connected directly to the electrical supply.

Technical features of the Grundfos CM 5-5 92880796

• Brand: Grundfos.
• Range: CM.
• Reference: 92880796.
• Model: CM 5-5 A-R-A-E-AVBE C1-A-A-N.
• EAN: 5715120968516.
• Type: horizontal multistage centrifugal pump.
• Number of impellers: 5.
• Reference liquid: water.
• Nominal flow rate: 4.7 cubic meters per hour.
• Nominal head: 38.61 meters.
• Approximate maximum flow rate: 6.1 cubic meters per hour.
• Approximate maximum head: 48 meters.
• Liquid temperature range: between -20 and 90 degrees Celsius.
• Maximum service pressure: 10 bar.
• Maximum pressure at 40 degrees Celsius: 10 bar.
• Maximum pressure at 90 degrees Celsius: 6 bar.
• Ambient temperature: between -20 and 55 degrees Celsius.
• Hydraulic body: EN-GJL-200 cast iron.
• Impellers: AISI 304 stainless steel.
• Shaft and chambers: stainless steel.
• Mechanical seal code: AVBE.
• Secondary seal material: EPDM.
• Suction connection: Rp 1 1/4 inch.
• Discharge connection: Rp 1 inch.
• Suction type: axial.
• Discharge type: radial.
• Motor nominal power P2: 0.9 kilowatts.
• Supply: single-phase 220 to 230 volts.
• Frequency: 50 hertz.
• Rated current: between 5.72 and 5.60 amperes.
• Nominal speed: between 2,790 and 2,810 revolutions per minute.
• Motor efficiency class: IE2.
• Motor protection rating: IP55.
• Insulation class: F.
• Integrated thermal protection: PTO.
• Frequency converter: not included.
• Electric cable included: no.
• Minimum efficiency index MEI: equal to or greater than 0.7.
• Net weight: 15.8 kilograms.
• Gross weight: 18.4 kilograms.
• Approximate length: 400 millimeters.
• Approvals: CE, EAC and UKCA.
• Potable water approvals: ACS and NSF61.
• Curve tolerance: ISO 9906:2012 3B.

Compact multistage pump for pressure boosting and water supply

The Grundfos CM 5-5 A-R-A-E-AVBE C1-A-A-N combines 5 hydraulic stages, stainless steel internal components and a 0.9 kilowatt single-phase motor to provide a nominal point of 4.7 cubic meters per hour at 38.61 meters head.

Its compact construction, 10 bar maximum pressure, threaded connections, IP55 protection and potable water approvals make this pump a versatile solution for distribution, transfer and pressure boosting installations that require a reliable horizontal centrifugal pump with compact dimensions.