Series description


Electronically controlled glanded double pump in in-line design with flange connection and automatic power adjustment


Pumping of heating water (acc. to VDI 2035), cold water and water/glycol mixtures without abrasive substances in heating, cold water and cooling systems.

Type key

ExampleDL-E 50/170-7.5/2-R1
DL-EIn-line double pump with electronic control
50Nominal diameter DN of the pipe connection
170Nominal impeller diameter
7.5Rated motor power P2 in kW
2Number of poles
R1Version without pressure sensor

Special features/product advantages

  • Energy savings due to integrated electronic power adjustment
  • Simple operation with Green Button Technology and display
  • Various operating modes: main/standby operation and parallel operation
  • Configurable fault response tailored to HVAC applications
  • Integrated full motor protection (PTC thermistor sensor) with trip electronics

Technical data

  • Minimum Efficiency Index (MEI) ≥ 0.4
  • Permissible temperature range of -20 °C to +140 °C
  • Mains connection
    • 3~440 V ±10 %, 50/60 Hz
    • 3~400 V ±10 %, 50/60 Hz
    • 3~380 V -5 % +10 %, 50/60 Hz
  • Protection class IP 55
  • Nominal diameter DN 40 to DN 200
  • Max. operating pressure 16 bar


Single-stage, low-pressure double pump in in-line design with

  • Switchover valve
  • Mechanical seal
  • Flange connection
  • Lantern
  • Coupling
  • Drive with integrated electronic speed control


  • Pump housing and lantern: EN-GJL-250
  • Impeller:
    • Standard version: EN-GJL-200
    • Special version: Bronze CuSn 10
  • Shaft: 1.4122
  • Mechanical seal: AQEGG; other mechanical seals on request


Operating modes

  • Δp-c for constant differential pressure
  • Δp-v for variable differential pressure
  • PID control
  • Constant speed (n=constant)

Manual operation level

  • Green button and display

Manual functions

  • Differential pressure setpoint setting
  • Setting the speed (manual control mode)
  • Setting the operating mode
  • Setting the pump ON/OFF
  • Configuration of all operating parameters
  • Fault acknowledgement

External control functions

  • "Overriding Off" control input
  • “External pump cycling” control input (effective only in dual pump operation)
  • Analogue input 0 – 10 V, 0 – 20 mA for constant speed (DDC) and remote setpoint adjustment
  • Analogue input 2 – 10 V, 4 – 20 mA for constant speed (DDC) and remote setpoint adjustment
  • Analogue input 0 – 10 V for actual value signal from pressure sensor
  • Analogue input 2 – 10 V, 0 – 20 mA, 4 – 20 mA for actual value signal from pressure sensor

Signal and display functions

  • Collective fault signal SSM
  • Collective run signal SBM

Data exchange

  • Infrared interface for wireless data exchange with IR-Monitor/IR-Stick
  • Plug-in position for Wilo IF-Modules (Modbus, BACnet, CAN, PLR, LON) for connection to building automation

Safety functions

  • Full motor protection with integrated trip electronics
  • Access disable

Dual pump management (double pump or 2 x single pumps)

  • Main/standby operation (automatic fault-actuated switchover)
  • Pump cycling main/standby operation after 24 hours
  • Parallel operation
  • Parallel operation (efficiency-optimised peak-load activation and deactivation)

Scope of delivery

  • Pump
  • Installation and operating instructions


  • Variant …-R1 without differential pressure sensor
  • ...-L1 variant with bronze impeller (at additional charge)
  • ...-H1 variant with housing made of spheroidal cast iron (at additional charge)
  • ...-S1/-S2 variant with special mechanical seal (at additional charge)


  • 3 Mounting brackets with fixation material for installation on a base
  • Blind flanges for double pump housing
  • IR-Monitor, Wilo-IR-Stick
  • IF-Module PLR for connecting to PLR/interface converter
  • IF-Module LON for connection to the LONWORKS network
  • IF-Module BACnet
  • IF-Module Modbus
  • CAN IF-Module
  • VR-HVAC control system
  • Control system CCe-HVAC
  • Control system SCe-HVAC
  • Differential pressure sensor (DDG)

General notes - ErP (ecological design-) directive

The benchmark for most efficient water pumps is MEI ≥ 0.70The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable speed drive that matches the pump duty to the system.Information on benchmark efficiency is available at www.europump.org/efficiencychartsPumps with power consumption > 150 kW or a volume flow QBEP < 6 m3/h are not subject to the Ecodesign Directive for water pumps. Therefore, no MEI value is shown.

Duty chart

Wilo-CronoTwin-DL-E (2-pole)

Wilo-CronoTwin-DL-E (4-pole)


Approved fluids (other fluids on request)

Heating water (in accordance with VDI 2035)

Water-glycol mixtures (for 20-40 vol.% glycol and fluid temperature ≤ 40 °C)

Cooling and cold water

Heat transfer oil

Special version at additional charge

Permitted field of application

Standard version for operating pressure pmax

16 bar (up to +120 °C) bar

Special version for operating pressure pmax

- bar

Temperature range at max. ambient temperature +40 °C

-20...+140 °C (depending on the fluid)

Max. ambient temperature

+40 °C

Installation in closed buildings

Outdoor installation


Pipe connections

Nominal connection diameters DN

40 - 200

Flanges (according to EN 1092-2)

PN 16


Pump housing






Impeller (special version)


Pump shaft


Mechanical seal


Other mechanical seals

On request

Electrical connection

Mains connection

3~380 V, 50/60 Hz

Speed range

750-2900 rpm


Motor technology

Asynchronous motor

Integrated full motor protection

Protection class

IP 55

Insulation class


Emitted interference

EN 61800-3

Interference resistance

EN 61800-3

Residual-current protection device (RCD)

Installation options

Pipe installation (≤ 15 kW motor power)

Support-bracket mounting


General overview

Edition 2017
Page format A4
Number of pages 72

PDF (46 MB)



Article Number 2112769-72, 2122801
Edition 1512
Version number 01
Page format A4
Number of pages 72

PDF (9 MB)



PDF: Wilo-CronoTwin-DL-E


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