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
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3
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

4
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.

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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

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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.

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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

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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

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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
A
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.

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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.