Single-stage glanded centrifugal pump in close-coupled design for an installation on a base with integrated frequency converter for an electronic control for constant or variable differential pressure (Δp-c/Δp-v). The CronoBloc BL-E has been predominantly designed for pumping heating water (acc. to VDI 2035), chilled water and water/glycol mixtures without abrasive substances in heating, air-conditioning and cooling systems.

Design

• Single-stage low-pressure centrifugal pump
• Spiral housing in close-coupled design with flange and housing dimensions according to DIN EN 733, flanges PN 16 – according to EN 1092-2
• Low-oscillation and low-noise close-coupled design with lantern, foot on pump housing and rigidly connected standard motor
• All grey cast iron components with cataphoretic coating as standard
• Direction-of-rotation-independent bellows mechanical seal with forced flushing and cavitation-reducing impeller.
• Mechanical seal S1 recommended for water-glycol mixtures with glycol proportions up to max. 50 % by volume and a fluid temperature of -20 °C up to max. +90 °C ... +110 °C and also if there is oil in the water-glycol mixture.

Accessories

• Supporting blocks for fixing to the base
• IR-Stick
• IF module PLR
• IF module LON
• IF module Modbus
• IF module BACnet
• IF module CAN
• Control system VR-HVAC
• Control system CCe-HVAC
• Control system SCe-HVAC
• Differential pressure sensor (DDG)

Standard equipment

Pump display for indication of:

• Control mode Δp-c (constant differential pressure), Δp-v (variable differential pressure), PID controller, n-constant (constant speed)
• Setpoint (e.g. differential pressure or speed)
• Error and warning messages
• Actual values (e.g. power consumption, actual value of the sensor)
• Operating data (e.g. operating hours, energy consumption)
• Status data (e.g. status of SSM and SBM relay)
• Device data (e.g. pump name)
• Operating mode (for Y-piece installation only: main/standby operation, parallel operation)

One-button manual operation level for:

• Pump On/Off
• Setpoint and speed adjustment
• Selecting the operation and control mode
• Configuration of operating parameters
• Fault acknowledgement

Additional functions

• 1x “Overriding OFF” control input
• 1x “External pump cycling” (effective only in twin-head pump operation)
• 1x Analogue input 0–10 V, 2–10 V, 0–20 mA, 4–20 mA for constant speed (DDC) or remote setpoint adjustment,
• 1x Analogue input 0–10 V, 2–10 V, 0–20 mA, 4–20 mA for actual value signal from pressure sensor
• IR interface for wireless communication with Wilo-IR-Stick operating and service device,
• Slot for Wilo IF modules for connection to the building automation system,
• Configurable, potential-free fault and operating/standby signal
• 1x Interface to dual-pump communication
• Three-phase AC motor with frequency converter
• Integrated dual-pump management
• Adjustable time interval for pump cycling (in dual-pump operation)
• Integrated full motor protection
• Different operating modes for heating (HV) or air-conditioning (AC) applications
• Access disable
• Different operation levels: Standard/service