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

8
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.

11
5. Electrical connection
Fig. 6 Electrical connection
The electrical connections and protection must be carried out in
accordance with local regulations.
• The motor requires no external motor protection.
• Check that the supply voltage and frequency correspond to the values
stated on the pump. See 14.1 Nameplate.
• Connect the pump to the mains with the plug supplied with the pump
as shown in fig. 6, steps 1 to 8.
• Light in the control panel shows that the electricity supply has been
switched on.
TM05 1927 4512
!
2
PHA2
2
2
PHA2
PHA2
ALAL
AL
ALPHA2 L
2
2
P
HA2
2
2
2
2
PHA2
PHA2
AL
A
AL
AL
ALPHA2 L
§
+
1
Min. ø5 mm
Max. ø10 mm
7 mm
12 mm
234
Max. 1.5 mm
2
7 mm
17 mm
0
1
Click
567
8
1 x 230V ~, 50 Hz
-10%
+ 6%
Warning
The pump must be connected to earth .
The pump must be connected to an external mains switch with a
minimum contact gap of 3 mm in all poles.

12
6. Control panel
Contents:
6.1 Elements on the control panel
6.2 "POWER ON" indicator light
6.3 Light fields indicating the pump setting
6.4 Push-button for selection of pump setting.
6.1 Elements on the control panel
Fig. 7 GRUNDFOS ALPHA2 L control panel
The control panel on the GRUNDFOS ALPHA2 L comprises:
6.2 "POWER ON" indicator light
The "POWER ON" indicator light, see fig. 7, pos. 1, is on when the
electricity has been switched on.
When the "POWER ON" indicator light is on only, a fault preventing the
pump from operating properly (e.g. seizing-up) has occurred.
If a fault is indicated, correct the fault and reset the pump by switching the
electricity supply off and on.
TM04 2526 3912
Pos. Description
1 "POWER ON" indicator light
2 Seven light fields indicating the pump setting
3 Push-button for selection of pump setting
1
2
3
ON
POWER
ALPHA2 L 25-40 180

13
6.3 Light fields indicating the pump setting
GRUNDFOS ALPHA2 L has seven optional settings which can be
selected with the push-button. See fig. 7, pos. 3.
The pump setting is indicated by seven different light fields. See fig. 8.
Fig. 8 Seven light fields
See 10. Pump settings and pump performance for information about the
function of the settings.
6.4 Push-button for selection of pump setting
Every time the push-button is pressed, see fig. 7, pos. 3, the pump setting
is changed.
A cycle is seven button presses. See 6.3 Light fields indicating the pump
setting.
TM04 2527 2608
Button
presses Light field Description
0PP2
(factory setting) Highest proportional-pressure curve
1CP1 Lowest constant-pressure curve
2CP2 Highest constant-pressure curve
3 III Constant speed, speed III
4 II Constant speed, speed II
5 I Constant speed, speed I
6PP1 Lowest proportional-pressure curve
7PP2 Highest proportional-pressure curve
III II I PP1
PP2 CP2
CP1
ON
POWER

14
7. Setting the pump
Contents:
7.1 Pump setting for system type
7.2 Pump control.
7.1 Pump setting for system type
Fig. 9 Selection of pump setting for system type
Factory setting = Highest proportional-pressure curve (PP2).
Recommended and alternative pump settings according to fig. 9:
Changing from recommended to alternative pump setting
Heating systems are "slow" systems that cannot be set to the optimum
operation within minutes or hours.
If the recommended pump setting does not give the desired distribution of
heat in the rooms of the house, change the pump setting to the shown
alternative.
Explanation to pump settings in relation to performance curves,
see 10. Pump settings and pump performance.
TM05 1921 4512
I
II
III POWER
ON
I
II
III
P
O
WER
ON
I
II
III POWER
ON
OK (OK)
I
II
III POWER
ON
I
II
III
P
O
WER
O
WER
O
R
ON
I
II
III POWER
ON
OK (OK)
I
II
III POWER
ON
I
II
III POWER
ON
I
II
III
P
O
WER
ER
ON
OK (OK)
2
2
P
HA2
P
HA2
AL
AL
ALPHA2 L
I
II
III POWER
ON I
II
III POWER
ON
I
II
III
P
O
WER
O
N
OK (OK)
A
B
C
D
Pos. System type
Pump setting
Recommended Alternative
A Underfloor heating Lowest constant-pressure curve
(CP1)*
Highest constant-pressure curve
(CP2)*
B Two-pipe systems Highest proportional-pressure
curve (PP2)*
Lowest proportional-pressure
curve (PP1)*
C One-pipe systems Lowest proportional-pressure
curve (PP1)*
Highest proportional-pressure
curve (PP2)*
D Domestic water Constant speed, speed I* Constant speed, speed II or III*
* See 13.1 Guide to performance curves.

15
7.2 Pump control
During operation, the pump head will be controlled according to the
principle "proportional-pressure control" (PP) or
"constant-pressure control" (CP).
In these control modes, the pump performance and consequently the
power consumption are adjusted according to the heat demand in the
system.
Proportional-pressure control
In this control mode, the differential pressure across the pump is
controlled according to the flow.
The proportional-pressure curves are indicated by PP1 and PP2 in the
Q/H diagrams. See 10. Pump settings and pump performance.
Constant-pressure control
In this control mode, a constant differential pressure across the pump is
maintained, irrespective of the flow.
The constant-pressure curves are indicated by CP1 and CP2 and are
the horizontal performance curves in the Q/H diagrams.
See 10. Pump settings and pump performance.

16
8. Systems with bypass valve between flow and return pipes
Contents:
8.1 Purpose of bypass valve
8.2 Manually operated bypass valve
8.3 Automatic bypass valve (thermostatically controlled).
8.1 Purpose of bypass valve
Fig. 10 Systems with bypass valve
Bypass valve
The purpose of the bypass valve is to ensure that the heat from the boiler
can be distributed when all valves in the underfloor-heating circuits and/or
thermostatic radiator valves are closed.
System elements:
• bypass valve
• flowmeter, pos. A.
The minimum flow must be present when all valves are closed.
The pump setting depends on the type of bypass valve used, i.e. manually
operated or thermostatically controlled.
8.2 Manually operated bypass valve
Follow this procedure:
1. Adjust the bypass valve with the pump in setting I (speed I).
The minimum flow (Qmin.) for the system must always be observed.
Consult the manufacturer's instructions.
2. When the bypass valve has been adjusted, set the pump according to
7. Setting the pump.
TM05 1930 4512
ALPHA2
2
2
2
2
P
HA2
P
HA2
AL
AL
ALPHA2 L
AUTO
BYPASS
1
2
Q
min.
3 3
A

17
8.3 Automatic bypass valve (thermostatically controlled)
Follow this procedure:
1. Adjust the bypass valve with the pump in setting I (speed I).
The minimum flow (Qmin.) for the system must always be observed.
Consult the manufacturer's instructions.
2. When the bypass valve has been adjusted, set the pump to the lowest
or highest constant-pressure curve.
Explanation to pump settings in relation to performance curves, see
10. Pump settings and pump performance.

18
9. Start-up
Contents:
9.1 Before start-up
9.2 Venting the pump
9.3 Venting of heating systems.
9.1 Before start-up
Do not start the pump until the system has been filled with liquid and
vented. The required minimum inlet pressure must be available at the
pump inlet. See 3. Applications and 12. Technical data and installation
dimensions.
9.2 Venting the pump
Fig. 11 Venting the pump
The pump is self-venting. It need not be vented before start-up.
Air in the pump may cause noise. This noise ceases after a few minutes
running.
Quick venting of the pump can be obtained by setting the pump to
speed III for a short period, depending on system size and design.
When the pump has been vented, i.e. when the noise has ceased, set the
pump according to the recommendations. See 7. Setting the pump.
The system cannot be vented through the pump.
See 9.3 Venting of heating systems.
TM05 1931 4512
2
2
P
HA2
P
HA2
AL
AL
ALPHA2 L
I
II
III
POWER
ON
I
III
1
2
= 10 Min.
Caution
The pump must not run dry.

19
9.3 Venting of heating systems
Fig. 12 Venting of heating systems
The heating system can be vented via an air escape valve installed above
the pump (1).
In heating systems that often contain much air, Grundfos recommends the
installation of pumps with pump housing with air separator, i.e.
ALPHA2 L pumps, type ALPHA2 L XX-XX A.
When the heating system has been filled with liquid, follow this procedure:
1. Open the air escape valve.
2. Set the pump to speed III.
3. Let the pump run for a short period, depending on system size and
design.
4. When the system has been vented, i.e. when the possible noise has
ceased, set the pump according to the recommendations.
See 7. Setting the pump.
Repeat the procedure, if necessary.
TM05 1932 4512
22
2
P
HA2
P
HA2
ALAL
AL
ALPHA2 L
I
II
III
POWER
ON
1
23
I
III
= 10 Min.
Caution
The pump must not run dry.

20
10. Pump settings and pump performance
Contents:
10.1 Relation between pump setting and pump performance.
10.1 Relation between pump setting and pump performance
Figure 13 shows the relation between pump setting and pump
performance by means of curves. See also 13. Performance curves.
Fig. 13 Pump setting in relation to pump performance
TM04 2532 2608
III
II
I
AUTO
PP1 PP2CP1CP2
H
Q
ON
POWER
Setting Pump curve Function
PP1
Lowest
proportional-
pressure curve
The duty point of the pump will move up or down on the lowest
proportional-pressure curve, see fig. 13, depending on the heating
demand.
The head (pressure) is reduced at falling heating demand and
increased at rising heating demand.
PP2
(factory
setting)
Highest
proportional-
pressure curve
The duty point of the pump will move up or down on the highest
proportional-pressure curve, see fig. 13, depending on the heating
demand.
The head (pressure) is reduced at falling heating demand and
increased at rising heating demand.
CP1
Lowest
constant-
pressure curve
The duty point of the pump will move out or in on the lowest
constant-pressure curve, see fig. 13, depending on the heating
demand in the system.
The head (pressure) is kept constant, irrespective of the heating
demand.
CP2
Highest
constant-
pressure curve
The duty point of the pump will move out or in on the highest
constant-pressure curve, see fig. 13, depending on the heating
demand in the system.
The head (pressure) is kept constant, irrespective of the heating
demand.
III Speed III
ALPHA2 L runs at a constant speed and consequently on a
constant curve.
In speed III, the pump is set to run on the max. curve under all
operating conditions. See fig. 13.
Quick venting of the pump can be obtained by setting the pump to
speed III for a short period. See 9.2 Venting the pump.