Grundfos alpha2l User manual

GRUNDFOS INSTRUCTIONS
ALPHA2 L
ALPHA2
2
2
L
PHA
2
LPHA2
L
L
AL
AL
ALPHA2 L
www.grundfos.com
GRUNDFOS ALPHA2 L
Installation and operating instructions

EC declaration of conformity
We, Grundfos, declare under our sole responsibility that the product
GRUNDFOS ALPHA2 L, 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).
Standard used: EN 60335-2-51:2003.
— EMC Directive (2004/108/EC).
Standards used: EN 55014-1:2006 and EN 55014-2:1997.
— Ecodesign Directive (2009/125/EC).
Circulators:
Commission Regulation Nos 641/2009 and 622/2012.
Standards used: EN 16297-1:2012 and EN 16297-2:2012.
Bjerringbro, 1st November 2012
Svend Aage Kaae
Technical Director
Grundfos Holding A/S
Poul Due Jensens Vej 7
8850 Bjerringbro, Denmark
Person authorised to compile technical file and
empowered to sign the EC declaration of conformity.
2

3
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. Systems with bypass valve between flow and return pipes . . . . . . . . . . . . . . . . 16
9. Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10. Pump settings and pump performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11. Fault finding chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
12. Technical data and installation dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
13. Performance curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
14. Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
15. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
16. Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

4
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.

5
2. General description
Contents:
2.1 The GRUNDFOS ALPHA2 L circulator pump
2.2 Advantages of installing a GRUNDFOS ALPHA2 L.
2.1 The GRUNDFOS ALPHA2 L circulator pump
The GRUNDFOS ALPHA2 L circulator pump is designed for the
circulation of water in heating systems.
Install the GRUNDFOS ALPHA2 L in
• underfloor heating systems
• one-pipe systems
• two-pipe systems.
GRUNDFOS ALPHA2 L incorporates a permanent-magnet motor and
differential-pressure control enabling continuous adjustment of the pump
performance to the actual system requirements.
GRUNDFOS ALPHA2 L has a user-friendly front-mounted control panel.
See 6. Control panel and 14. Features.
2.2 Advantages of installing a GRUNDFOS ALPHA2 L
The installation of a GRUNDFOS ALPHA2 L means
easy installation and start-up
• GRUNDFOS ALPHA2 L is easy to install.
With the 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.
Energy efficiency index (EEI)
• The Ecodesign directive for energy-using (EuP) and energy-related
products (ErP) is EU legislation requiring manufacturers to reduce the
overall environmental impact of their products.
• Circulator pumps will be EuP-ready and comply with the requirements
as from 2015.
Fig. 1 EuP ready label
TM05 2085 4411

6
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 L 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.
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.
TM05 1923 4512
Max. 1.0 MPa (10 bar)
75 °C
Min.
0.005 MPa
0.05 bar
90 °C 110 °C
Min.
0.028 MPa
0.28 bar
Min.
0.108 MPa
1.08 bar
Max. 95% RH
IP 42
0.0 0.4 0.8 1.2 1.6 2.0 2.4 Q [m³/h]
0
2
4
6
[m]
H
0
20
40
60
[kPa]
p
0.0 0.2 0.4 0.6 Q [l/s]
ALPHA2L XX-50
ALPHA2L XX-40 / ALPHA2L XX-45
ALPHA2L XX-60
2
2
PHA2
2
2
2
2
P
HA2
P
HA2
AL
A
AL
AL
ALPHA2 L
2
PHA2
2
2
P
HA2
P
HA2
ALAL
AL
ALPHA2 L
Warning
The pump must not be used for the transfer of flammable liquids
such as diesel oil, petrol and similar liquids.

7
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
IP42. 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 L
Arrows on the pump housing indicate the liquid flow direction through the
pump.
See 12.2 Installation dimensions, GRUNDFOS ALPHA2 L XX-40, XX-45,
XX-50, XX-60.
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.
TM05 1924 4512
2
PHA2
2
2
P
HA2
P
HA2
ALAL
AL
ALPHA2 L
2
2
PHA2
2
2
2
2
P
HA2
P
HA2
AL
A
AL
AL
ALPHA2 L
AB

9
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.
TM05 1925 4512
!
1
3
5
4
!
2
2
2
PHA
2
PHA2
A
A
A
L
AL
ALPHA2 L
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.

10
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 15. Accessories.
TM05 1926 4512
22
2
2
2
P
HA2
P
HA2
A
AL
AL
A
A
A
A
A
A
A
A
ALPHA2 L
Note
Limit the heat loss from the pump housing and pipework.
Caution
Do not insulate the control box or cover the control panel.