CronoNorm-NL

Design

Application

• Pumping of heating water (acc. to VDI 2035), chilled water and water/glycol mixtures without abrasive substances in heating, chilled water and cooling systems.
• Applications for irrigation, building services, general industry, power stations, etc.

Equipment/function

Single-stage low-pressure centrifugal pump in close-coupled design with coupling, coupling guard, motor and baseplate

• Mechanical shaft seal or stuffing box

Type key

Technical data

• Permissible temperature range of -20°C to +120°C
• Mains connection 3~400 V, 50 Hz
• IP rating IP55
• Nominal diameter DN 32 to DN 150
• Max. operating pressure 16 bar

Materials

• Pump housing and pressure lid: EN-GJL-250
• Bearing bracket: EN-GJL-250
• impeller: EN-GJL-250(special version: G-CuSn10)
• Shaft: X20Cr13
• Mechanical seal: AQ1EGG(other mechanical seals on request)

Construction

• Single-level, low-pressure centrifugal pump as baseplate pump with axial suction ports with flanged bearing bracket and axle fastening for flexibly coupled drives
• Spacer coupling (sleeve coupling) available optionally, they provide the option to leave the motor in position when dismantling the rotor unit

Scope of delivery

• Pump
• Installation and operating instructions
• Pump with free shaft end or
• Pump on baseplate with coupling and coupling guard, without motor or
• Completely mounted pump on baseplate with electric motor

Options

• Other materials and versions on request
• Other voltages and frequencies available on request.

Accessories

Automatic speed control:

for automatic, infinitely variable pump power control. Please contact Wilo for more information on “Switchgears and control devices”.

Commissioning

• If pumps with 2900 rpm are installed inside residential buildings, then corresponding noise reducing measures are to be implemented.
• Pump curves and specific motor powers depend on the respective fluid being pumped. Pump curves and power vary considerably when fluids are conveyed that differ from water in thickness and/or viscosity. For this, please observe the table "Recommended limit values for dimensioning". The recommended limit values for dimensioning are calculated as follows:Qoptimum (volume flow at which the pump reaches its best efficiency), to be read from the individual pump curve; factors Qmin and Qmax , to be taken from the table "Recommended limit values for dimensioning".Qmin dimensioning = Qmin x QoptimumQmax dimensioning = Qmax x Qoptimum Example: Size NL 32-125Qmin = 0.3 x 8 = 2.4 m³/hQmax = 1.2 x 8 = 9.6 m³/h
• Load-sensitive pump outputAll Wilo standard pumps are equipped with IEC standard motors. The Wilo control devices are suitable for automatic load-sensitive speed control of pumps that are driven by any standard motors of conventional manufacture.
• Main/standby mode