Grundfos Alpha2 l User manual

GRUNDFOS INSTRUCTIONS

GRUNDFOS ALPHA2

Installation and operating instructions

Declaration of Conformity

We, Grundfos, declare under our sole responsibility that the product

GRUNDFOS ALPHA2, to which this declaration relates, is in conformity

with these Council directives on the approximation of the laws of the EC

member states:

— Low Voltage Directive (2006/95/EC).

Standards used: EN 60335-1: 2002 and EN 60335-2-51: 2003.

— EMC Directive (2004/108/EC).

Standards used: EN 61000-6-2 and EN 61000-6-3.

Bjerringbro, 15th September 2009

Svend Aage Kaae

Technical Director

Original installation and operating instructions.

CONTENTS Page

1. Symbols used in this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2. General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5. Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6. Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7. Setting the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

8. Automatic Night SetBack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

9. Systems with bypass valve between flow and return pipes . . . . . . . . . . . . . . . . 19

10. Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

11. Pump settings and pump performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

12. Fault finding chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

13. Technical data and installation dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

14. Performance curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

15. Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

16. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

17. Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Original installation and operating instructions.

1. Symbols used in this document

Warning

Prior to installation, read these installation and operating

instructions. Installation and operation must comply with local

regulations and accepted codes of good practice.

Warning

The use of this product requires experience with and knowledge of

the product.

Persons with reduced physical, sensory or mental capabilities must

not use this product, unless they are under supervision or have been

instructed in the use of the product by a person responsible for their

safety.

Children must not use or play with this product.

Warning

If these safety instructions are not observed, it may result in

personal injury!

Caution

If these safety instructions are not observed, it may result in

malfunction or damage to the equipment!

Note

Notes or instructions that make the job easier and ensure safe

operation.

2. General description

Contents:

2.1 The GRUNDFOS ALPHA2 circulator pump

2.2 Advantages of installing a GRUNDFOS ALPHA2.

2.1 The GRUNDFOS ALPHA2 circulator pump

The GRUNDFOS ALPHA2 circulator pump is designed for the circulation

of water in heating systems and domestic hot-water systems.

GRUNDFOS ALPHA2 is the best choice for

• underfloor heating systems

• one-pipe systems

• two-pipe systems.

GRUNDFOS ALPHA2 incorporates a permanent-magnet motor and

differential-pressure control enabling continuous adjustment of the pump

performance to the actual system requirements.

GRUNDFOS ALPHA2 has a user-friendly front-mounted control panel.

See 6. Control panel and 15. Features.

2.2 Advantages of installing a GRUNDFOS ALPHA2

The installation of a GRUNDFOS ALPHA2 means

easy installation and start-up

• GRUNDFOS ALPHA2 is easy to install.

Thanks to the AUTOADAPT function (factory setting), the pump can, in

most cases, be started without making any settings.

high degree of comfort

• Minimum noise from valves, etc.

low energy consumption

• Low energy consumption compared to conventional circulator pumps.

The GRUNDFOS ALPHA2 is A-labelled.

Fig. 1 Energy label, A-labelled

TM03 0868 0705

3. Applications

Contents:

3.1 System types

3.2 Pumped liquids

3.3 System pressure

3.4 Relative air humidity (RH)

3.5 Enclosure class

3.6 Inlet pressure.

3.1 System types

Fig. 2 Pumped liquids and operating conditions

GRUNDFOS ALPHA2 is suitable for

• systems with constant or variable flows where it is desirable to

optimise the setting of the pump duty point

• systems with variable flow-pipe temperature

• systems where night setback is desired.

3.2 Pumped liquids

Clean, thin, non-aggressive and non-explosive liquids, not containing

solid particles, fibres or mineral oil. See fig. 2.

In heating systems, the water should meet the requirements of accepted

standards on water quality in heating systems, e.g. the German standard

VDI 2035.

In domestic hot-water systems, it is advisable to use GRUNDFOS

ALPHA2 pumps only for water with a degree of hardness lower than

approx. 14 °dH. For water with a higher degree of hardness, a direct-

coupled TPE pump is recommended.

TM03 8921 2707

Warning

The pump must not be used for the transfer of flammable liquids

such as diesel oil, petrol and similar liquids.

3.3 System pressure

Maximum 1.0 MPa (10 bar). See fig. 2.

3.4 Relative air humidity (RH)

Maximum 95 %. See fig. 2.

3.5 Enclosure class

IP 42. See fig. 2.

3.6 Inlet pressure

Minimum inlet pressure in relation to liquid temperature. See fig. 2.

Liquid temperature Minimum inlet pressure

[MPa] [bar]

≤75 °C 0.005 0.05

90 °C 0.028 0.28

110 °C 0.108 1.08

4. Installation

Contents:

4.1 Mounting

4.2 Control box positions

4.3 Changing the control box position

4.4 Insulation of pump housing.

4.1 Mounting

Fig. 3 Mounting the GRUNDFOS ALPHA2

Arrows on the pump housing indicate the liquid flow direction through the

pump.

See 13.2 Installation dimensions – GRUNDFOS ALPHA2 XX-40, XX-50,

XX-60 or 13.3 Installation dimensions – GRUNDFOS ALPHA2 25-40 A,

25-60 A.

1. Fit the two gaskets supplied when the pump is mounted in the pipe.

See fig. 3, pos. A.

2. Install the pump with the motor shaft horizontal. See fig. 3, pos. B.

TM03 8922 2707

4.2 Control box positions

Fig. 4 Control box positions

4.3 Changing the control box position

The control box can be rotated in steps of 90 °.

Possible/permissible positions and the procedure of changing the position

of the control box are illustrated in fig. 4, pos. A.

Procedure:

1. Slacken and remove the four hexagon-socket head screws holding the

pump head with a tee key (M4).

2. Turn the pump head to the desired position.

3. Insert and cross-tighten the screws.

TM03 8923 2707

Warning

The pumped liquid may be scalding hot and under high pressure!

Drain the system or close the isolating valves on either side of the

pump before the screws are removed.

Caution

When the position of the control box has been changed, fill the

system with the liquid to be pumped or open the isolating valves.

4.4 Insulation of pump housing

Fig. 5 Insulation of pump housing

The heat loss from the pump and pipework can be reduced by insulating

the pump housing and the pipe. See fig. 5.

As an alternative, polystyrene insulation shells can be ordered from

Grundfos. See 16. Accessories.

TM03 8924 2707

Note

Limit the heat loss from the pump housing and pipework.

Caution

Do not insulate the control box or cover the control panel.

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