Grundfos CM pressure-switch boosters use fixed-speed multistage pumps for household, irrigation, agricultural and light commercial water supply.
CMB 1-36: rated duty 28.3LPM at 24.2m head.
CMB 3-37: rated duty 51.7LPM at 27.4m head.
CMB 5-47: rated duty 78.3LPM at 38.6m head.
CMB 5-56: rated duty 78.3LPM at 46.5m head.
CMB 5-75: rated duty 78.3LPM at 62.4m head.
CMB 10-47: rated duty 166.7LPM at 38m head.
The CMB 1-36 and CMB 3-37 have a 1" BSP female inlet.
The CMB 5-47, CMB 5-56 and CMB 5-75 have a 1 1/4" BSP female inlet.
The CMB 10-47 has a 1 1/2" BSP female inlet.
All six have a 1" BSP male system outlet.
A suitable pressure tank is required and is supplied separately. It stores water under pressure, allowing small amounts of water to be drawn before the pump needs to restart.
Supplied with a pressure switch that automatically starts the pump when water pressure falls and stops it when pressure rises.
Rated duty pairs show flow at the stated head; they are not maximum-flow ratings.
Flow decreases as head increases. Select the pump for the required flow and pressure, allowing for inlet conditions, height differences and losses through fittings and pipework.
Use clean fresh water without solid particles or fibres, at temperatures from 0°C to 60°C.
These pumps are not self-priming. Before starting, fill the pump casing and inlet pipe with clean water, following the installation instructions. Maximum suction lift is 1m at 20°C, including inlet pipe losses. Install in a ventilated, weather-protected position with drainage and protection from frost.
An installer can adjust the start and stop pressures to suit the system, within the pump’s capacity and the pressure tank’s limits.
CMB 1-36, CMB 3-37 and CMB 5-47: 100-500kPa switch start-pressure adjustment range.
CMB 5-56, CMB 5-75 and CMB 10-47: 300-1200kPa switch start-pressure adjustment range.
These are switch adjustment limits, not the pressures the pump can necessarily deliver. The stop pressure must be achievable by the pump and below both its 1000kPa operating limit and the tank’s pressure limit.
The pump housing, impellers and shaft are stainless steel, with polymer diffusers. A pressure switch, pressure gauge, five-way fitting and non-return valve are supplied. The single-phase motor has thermal overload protection.
Two-year Grundfos Australian consumer warranty from purchase, subject to its terms.
Grundfos CM Pump Installation & Operating Instructions
Grundfos CM-PS & CM-PT Pressure-Switch Instructions
