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Grundfos ALPHA2 User Manual

Grundfos ALPHA2
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GRUNDFOS INSTRUCTIONS
GRUNDFOS ALPHA2
Installation and operating instructions

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Grundfos ALPHA2 Specifications

General IconGeneral
Max Head8 m
Voltage230 V
Frequency50/60 Hz
TypeCirculator Pump
Max. operating pressure10 bar
SeriesALPHA2
Connection TypeThreaded
Protection ClassIP42
Liquid Temperature Range2°C to 110°C
Energy Efficiency Index≤ 0.23
Connection sizeG 1 1/2
EEI≤ 0.23

Summary

Declaration of Conformity

Symbols used in this document

General description

The GRUNDFOS ALPHA2 circulator pump

Details the design and purpose of the ALPHA2 circulator pump.

Advantages of installing a GRUNDFOS ALPHA2

Highlights key benefits like easy installation, comfort, and low energy consumption.

Applications

System types

Specifies compatible heating system types for the ALPHA2 pump.

Pumped liquids

Defines acceptable liquids for pumping and liquids to avoid.

System pressure

Defines the maximum permissible system pressure for the pump.

Relative air humidity (RH)

Specifies the maximum allowed relative air humidity for operation.

Enclosure class

Indicates the pump's protection against solids and liquids (IP rating).

Inlet pressure

Details minimum inlet pressure requirements based on liquid temperature.

Installation

Mounting

Provides instructions for physically mounting the pump in the system.

Control box positions

Explains the different possible positions for the pump's control box.

Changing the control box position

Details the procedure for rotating the pump's control box.

Insulation of pump housing

Guides on how to insulate the pump housing to reduce heat loss.

Electrical connection

Control panel

Elements on the control panel

Identifies and describes the components of the pump's control panel.

Display

Explains the function and information shown on the pump's digital display.

Light fields indicating the pump setting

Explains the eight light fields that indicate the selected pump setting.

Light field indicating the status of Automatic Night SetBack

Describes the light indicator for the Automatic Night SetBack function.

Push-button for activation of Automatic Night SetBack

Details how to activate or deactivate the Automatic Night SetBack feature.

Push-button for selection of pump setting

Explains how to cycle through and select different pump settings.

Setting the pump

Pump setting for system type

Recommends pump settings based on different heating system types.

Pump control

Explains the principles of proportional and constant pressure control modes.

Automatic Night SetBack

Basis for Automatic Night SetBack

Outlines the conditions and prerequisites for using Automatic Night SetBack.

Function of Automatic Night SetBack

Describes how the Automatic Night SetBack function operates and changes pump performance.

Systems with bypass valve between flow and return pipes

Purpose of bypass valve

Explains the function of a bypass valve in heating systems.

Manually operated bypass valve

Provides instructions for adjusting a manually operated bypass valve.

Automatic bypass valve (thermostatically controlled)

Details setting a pump with a thermostatically controlled bypass valve.

Start-up

Before start-up

Specifies prerequisites before the pump can be safely started.

Venting the pump

Guides on how to vent air from the pump itself.

Venting of heating systems

Explains the process for venting air from the entire heating system.

Pump settings and pump performance

Relation between pump setting and pump performance

Shows how different pump settings affect performance curves.

Fault finding chart

Technical data and installation dimensions

Technical data

Lists all technical specifications, operating limits, and performance data.

Installation dimensions – GRUNDFOS ALPHA2 XX-40, XX-50, XX-60

Provides dimensional drawings and data for specific ALPHA2 models.

Installation dimensions – GRUNDFOS ALPHA2 25-40 A, 25-60 A

Provides dimensional drawings and data for specific ALPHA2 A models.

Performance curves

Guide to performance curves

Explains how to read and interpret pump performance curves.

Curve conditions

Details the standard conditions under which performance curves are generated.

Performance curves, ALPHA2 XX-40

Presents performance curves for the ALPHA2 XX-40 pump model.

Performance curves, ALPHA2 XX-50

Presents performance curves for the ALPHA2 XX-50 pump model.

Performance curves, ALPHA2 XX-60

Presents performance curves for the ALPHA2 XX-60 pump model.

Features

Nameplate

Explains the information found on the pump's nameplate.

Type key

Provides a key to understanding the alphanumeric designation of pump types.

Accessories

Disposal

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