Pressure Group CMB 3-37 A-C-A-C-A-A

The Grundfos CMB 3-37 pressure booster set, reference 97755653, is a compact and reliable solution for boosting pressure in homes and small commercial buildings. It consists of a horizontal multistage pump CM 3-37 and a pressure controller PM1 that automatically manages start and stop based on water demand, while also providing protection against dry running.

Its compact design and easy installation make it a practical choice for users needing to enhance water supply pressure without complications. The system activates when a tap is opened and shuts off automatically when closed, optimizing energy consumption and reducing pump wear.

This model features a starting pressure of 1.5 bar and can achieve a nominal flow rate of 3.1 m³/h with a head of up to 27.7 m. Its components made of cast iron and stainless steel ensure durability and corrosion resistance, making it suitable for sanitary and general water supply.

Main Applications

• Pressure boosting in domestic installations
• Water supply in single-family homes or small buildings
• Light commercial applications with constant pressure needs

Hydraulic Features

• Nominal flow rate: 3.1 m³/h
• Maximum head: 27.7 m
• Starting pressure (PM1): 1.5 bar
• Operating speed: 2900 rpm
• Liquid temperature: 0 to 60 °C
• Maximum suction height: 1 m (not self-priming)

Materials

• Pump casing: Cast iron EN-JL1030 / ASTM 30 B
• Impeller: Stainless steel EN 1.4301 / AISI 304

Electrical Data

• Nominal power (P2): 0.5 kW
• Voltage: 1 × 220–240 V
• Frequency: 50 Hz
• Maximum consumption: 2.8–3.1 A
• Insulation class: F
• Protection grade: IP55
• Cable length: 1.5 m with Schuko plug

Installation and Design

• Connections: Rp 1” (inlet) / G 1” (outlet)
• Maximum working pressure: 10 bar
• Maximum ambient temperature: 55 °C

Additional Data

• Net weight: 13.6 kg
• Gross weight: 17.1 kg
• Country of origin: Hungary
• Approvals: CE

The Grundfos CMB 3-37 with PM1 is an efficient and user-friendly pressure booster set that ensures a stable water supply, protecting the pump from low flow or no liquid situations. Its compact design, quality materials, and ease of installation make it ideal for enhancing hydraulic performance in residential or small-scale commercial installations.