Grundfos alpha2 l User manual

GRUNDFOS ALPHA2 L
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
CONTENTS
Page
1. General information
1.1 Hazard statements
The symbols and hazard statements below may appear in
Grundfos installation and operating instructions, safety
instructions and service instructions.
The text accompanying the three hazard symbols DANGER,
WARNING and CAUTION is structured in the following way:
The hazard statements are structured in the following way:
1. General information 2
1.1 Hazard statements 2
1.2 Notes 3
2. Receiving the product 3
2.1 Inspecting the product 3
2.2 Scope of delivery 3
3. Installing the product 3
3.1 Mechanical installation 3
3.2 Mounting 3
3.3 Control box positions 4
3.4 Changing the control box position 5
3.5 Insulation of pump housing 5
4. Electrical installation 5
4.1 Assembling the plug 6
5. Starting up the product 7
5.1 Before startup 7
5.2 Venting the pump 7
5.3 Venting of heating systems 7
6. Product introduction 8
6.1 Product description 8
6.2 Application 8
6.3 Advantages of installing a GRUNDFOS ALPHA2 L 8
6.4 Intended use 8
6.5 Pumped liquids 8
6.6 System pressure 8
6.7 Relative air humidity (RH) 8
6.8 Enclosure class 8
6.9 Inlet pressure 8
7. Identification 9
7.1 Nameplate 9
7.2 Type key 9
8. Accessories 10
9. Operating panel 11
9.1 Elements on the operating panel 11
9.2 "POWER ON" light field 11
9.3 Light fields indicating the pump setting 11
9.4 Push-button for selection of pump setting 11
10. Setting the pump 12
10.1 Pump setting for system type 12
10.2 Pump control 12
11. Systems with bypass valve between flow and return
pipes 13
11.1 Purpose of bypass valve 13
11.2 Manually operated bypass valve 13
11.3 Automatic bypass valve (thermostatically controlled) 13
12. Pump settings and pump performance 14
12.1 Relation between pump setting and pump performance 14
13. Fault finding the product 15
13.1 Fault finding table 15
14. Technical data and installation dimensions 16
14.1 Technical data 16
14.2 Installation dimensions, GRUNDFOS ALPHA2 L XX-
40, XX-50, XX-60 17
15. Performance curves 18
15.1 Guide to performance curves 18
15.2 Curve conditions 18
15.3 Performance curves, ALPHA2 L XX-40 19
15.4 Performance curves, ALPHA2 L XX-50 19
15.5 Performance curves, ALPHA2 L XX-60 20
16. Disposing of the product 20
Read this document and the quick guide before you
install the product. Installation and operation must
comply with local regulations and accepted codes of
good practice.
This appliance can be used by children aged from 8
years and above and persons with reduced physical,
sensory or mental capabilities or lack of experience
and knowledge if they have been given supervision
or instruction concerning use of the appliance in a
safe way and understand the hazards involved.
Children shall not play with the appliance. Cleaning
and user maintenance shall not be made by children
without supervision.
DANGER
Indicates a hazardous situation which, if not avoided,
will result in death or serious personal injury.
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious personal injury.
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate personal injury.
SIGNAL WORD
Description of hazard
Consequence of ignoring the warning.
- Action to avoid the hazard.

English (GB)
3
1.2 Notes
The symbols and notes below may appear in Grundfos
installation and operating instructions, safety instructions and
service instructions.
2. Receiving the product
2.1 Inspecting the product
Check that the product received is in accordance with the order.
Check that the voltage and frequency of the product match
voltage and frequency of the installation site. See section
7.1 Nameplate.
2.2 Scope of delivery
The box contains the following items:
• ALPHA2 L pump
• installer plug
• two gaskets
• quick guide.
3. Installing the product
3.1 Mechanical installation
3.2 Mounting
A blue or grey circle with a white graphical symbol
indicates that an action must be taken.
A red or grey circle with a diagonal bar, possibly with
a black graphical symbol, indicates that an action
must not be taken or must be stopped.
If these instructions are not observed, it may result in
malfunction or damage to the equipment.
Tips and advice that make the work easier.
CAUTION
Crushing of feet
Minor or moderate personal injury
- Wear safety shoes when opening the box and
handling the product.
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before starting any
work on the product. Make sure that the power
supply cannot be accidentally switched on.
CAUTION
Crushing of feet
Minor or moderate personal injury
- Wear safety shoes when opening the box and
handling the product.
Installation must be carried out by trained persons in
accordance with local regulations.
The pump must always be installed with a horizontal
motor shaft within ± 5 °.
The mechanical installation must be carried out by
trained persons in accordance with local regulations.
TM07 4154 1119
!
0/Off
1/On

English (GB)
4
Fig. 1 Mounting the GRUNDFOS ALPHA2 L
Fig. 2 Mounting the GRUNDFOS ALPHA2 L
Arrows on the pump housing indicate the liquid flow direction
through the pump.
See section 14.2 Installation dimensions, GRUNDFOS ALPHA2 L
XX-40, XX-50, XX-60.
• Fit the two gaskets supplied when the pump is mounted in the
pipe.
• Install the pump with horizontal motor shaft. See figs 1and 2.
3.3 Control box positions
Fig. 3 Control box positions
TM07 4156 1119
TM07 4155 1119
TM07 4157 1119TM07 4158 1119
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before starting any
work on the product. Make sure that the power
supply cannot be accidentally switched on.
CAUTION
Hot surface
Minor or moderate personal injury
- The pump housing may be hot due to the pumped
liquid being scalding hot. Close the isolating valves
on both sides of the pump and wait for the pump
housing to cool down.
CAUTION
Pressurised system
Minor or moderate personal injury
- Before dismantling the pump, drain the system or
close the isolating valves on both sides of the
pump. The pumped liquid may be scalding hot
and under high pressure.

English (GB)
5
3.4 Changing the control box position
The control box position can be changed in steps of 90 °.
Possible or permissible positions and the procedure of changing
the position of the control box are illustrated in fig. 3.
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.
3.5 Insulation of pump housing
Fig. 4 Insulation of pump housing
The heat loss from the pump and pipes can be reduced by
insulating the pump housing and the pipe. See fig. 4.
As an alternative, polystyrene insulating shells can be fitted to the
pump. See section 8. Accessories.
4. Electrical installation
The pump requires no external motor protection.
• Check that the supply voltage and frequency correspond to
the values stated on the nameplate. See section
7.1 Nameplate.
• Connect the pump to the power supply with the plug supplied
with the pump as shown in section 4.1 Assembling the plug
Light in the operating panel shows that the power supply has
been switched on.
Fill the system with the liquid to be pumped or open
the isolating valves when the position of the control
box has been changed.
TM05 8561 2413
Limit the heat loss from the pump housing and pipes.
Do not insulate the control box or cover the operating
panel.
DANGER
Electric shock
Death or serious personal injury
- All electrical connections must be carried out by a
qualified electrician in accordance with local
regulations.
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before starting any
work on the product. Make sure that the power
supply cannot be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- Connect the pump to earth.
DANGER
Electric shock
Death or serious personal injury
- If national legislation requires a Residual-Current
Device (RCD) or equivalent in the electrical
installation, or if the pump is connected to an
electric installation where an RCD is used as an
additional protection, this must be type A or better,
due to the nature of the pulsating DC leakage
current. The RCD must be marked with the symbol
shown below:
The pump is not a safety component and cannot be
used to ensure functional safety in the final
appliance.

English (GB)
6
4.1 Assembling the plug
Step Action Illustration
1
Fit the cable gland
and plug cover to
the cable. Strip the
cable conductors as
illustrated.
TM05 5538 3812
2
Connect the cable
conductors to the
power supply plug.
TM05 5539 3812
3
Bend the cable with
the cable
conductors pointing
upwards.
TM05 5540 3812
4
Pull out the
conductor guide
plate and throw it
away.
TM05 5541 3812
5
Click the plug cover
onto the power
supply plug.
TM05 5542 3812
12 mm
17 mm
7 mm
Ø 5.5 -10 mm
0.5 - 1.5 mm2
LN
6
Screw the cable
gland onto the
power supply plug.
TM05 5543 3812
7
Insert the power
supply plug into the
male plug in the
pump control box.
TM07 4159 1119
Step Action Illustration

English (GB)
7
5. Starting up the product
5.1 Before startup
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 section 14. Technical data and
installation dimensions.
5.2 Venting the pump
Fig. 5 Venting the pump
The pump is self-venting. It does not need to be vented before
startup.
Air in the pump may cause noise. This noise will cease 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, that is when the noise has
ceased, set the pump according to the recommendations. See
section 10. Setting the pump.
The system cannot be vented through the pump. See section
12. Pump settings and pump performance.
5.3 Venting of heating systems
Fig. 6 Venting of heating systems
The heating system can be vented via an air escape valve
installed above the pump. 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, that is when the possible
noise has ceased, set the pump according to the
recommendations. See section 10. Setting the pump.
Repeat the procedure, if necessary.
TM05 8676 2613
The pump must not run dry.
TM05 8560 2613
The pump must not run dry.

English (GB)
8
6. Product introduction
6.1 Product description
Fig. 7 Pumped liquids and operating conditions
6.2 Application
The GRUNDFOS ALPHA2 L circulator pump is designed for the
circulation of water in heating systems.
The pump is suitable for the following systems:
• underfloor heating systems
• one-pipe systems
• two-pipe systems.
The pump incorporates a permanent-magnet motor and
differential-pressure control enabling continuous adjustment of
the pump performance to the actual system requirements.
The pump has a user-friendly front-mounted operating panel. See
sections 7. Identification and 9. Operating panel.
6.3 Advantages of installing a GRUNDFOS ALPHA2 L
The installation of a GRUNDFOS ALPHA2 L means
Easy installation and startup
• The pump 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 (ErP) products is EU legislation requiring
manufacturers to reduce the overall environmental impact of
their products.
• The pumps are energy-optimised and comply with the
regulations of the EuP directive.
6.4 Intended use
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.
6.5 Pumped liquids
Clean, thin, non-aggressive and non-explosive liquids, not
containing solid particles, fibres or mineral oil. See fig. 7.
In heating systems, the water must meet the requirements of
accepted standards on water quality in heating systems, for
example the German standard VDI 2035.
6.6 System pressure
Maximum 1.0 MPa (10 bar). See fig. 7.
6.7 Relative air humidity (RH)
Maximum 95 %. See fig. 7.
6.8 Enclosure class
IP42. See fig. 7.
6.9 Inlet pressure
Minimum inlet pressure in relation to liquid temperature. See fig.
7.
TM07 4160 1119
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
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]
ALPHA1 /ALPHA2/ALPHA2 L XX-50
ALPHA1 /ALPHA2/ALPHA2 L XX-40 / XX-45
ALPHA1 /ALPHA2/ALPHA2 L XX-60
Max. 1.0 MPa
(10 bar)
< 43 dB(A)
Min./Max.
+2 °C / +110 °C
Min./Max.
0 °C / +40 °C
Max. 95 % RH
IP42
CAUTION
Flammable material
Minor or moderate personal injury.
- Do not use the pump for flammable liquids, such
as diesel oil and petrol.
CAUTION
Corrosive substance
Minor or moderate personal injury.
- Do not use the pump for aggressive liquids, such
as acids and seawater.
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

English (GB)
9
7. Identification
7.1 Nameplate
Fig. 8 Example of nameplate
7.2 Type key
TM05 5925 1019
Pos. Description
1 Pump type
2 Product number
3 Serial number
4
Production code:
• 1st and 2nd digits = year
• 3rd and 4th digits = week
5Enclosureclass
6 Voltage [V]
7 Frequency [Hz]
8 Energy efficiency index (EEI)
9
Rated current [A]:
• Min.: Minimum current [A]
• Max.: Maximum current [A]
10
Input power P1 [W]:
• Min.: Minimum input power P1 [W]
• Max.: Maximum input power P1 [W]
11 Maximum system pressure [MPa]
12 CE mark and approvals
13 Country of manufacture
14 Temperature class
Prod. No. 95047562
00000001
Serial No.
PC 0833 TF110
IP 42 230V ~ 50Hz Max.
Min. 0.05
I1/1(A) P1(W) MPa
5
22 1.0
0.19
KM07183
2
3
4
5
67
910 11
12
1314
8MADE IN DENMARK
1
ALPHA2 25-40 180
AUTO
ADAPT
W
A
ALPHA2L 25-40 180
ON
POWER
ALPHA2 L 25-40 180
Example ALPHA2 L 25 -40 180
Pump type
Nominal diameter (DN) of inlet and outlet ports
[mm]
Maximum head [dm]
: Cast-iron pump housing
N: Stainless-steel pump housing
Port-to-port length [mm]

English (GB)
10
8. Accessories
Accessories for GRUNDFOS ALPHA2 L. See fig. 9.
Accessories include
• fittings (unions and valves)
• insulating kits (insulating shells)
•plug.
Fig. 9 Accessories
TM07 4161 1119
25-XX (A) 3/4" 529921
25-XX (A) 1" 529922
32-XX 1" 509921
32-XX 1 1/4" 509922
25-XX N 3/4" 529971
25-XX N 1" 529972
32-XX N 1 1/4" 509971
Product No
Product No
Product No
25-XX (A)(N) 3/4" 519805
25-XX (A)(N) 1" 519806
32-XX (N) 1 1/4" 505539
Product No
Product No
Product No
15-XX 130
25-XX 130 505821
32-XX 130
15-XX A 180
25-XX A 180 505822
15-XX
25-XX 98284561
32-XX
Product No
15-XX
25-XX 98610291
32-XX

English (GB)
11
9. Operating panel
9.1 Elements on the operating panel
Fig. 10 GRUNDFOS ALPHA2 L operating panel
The operating panel comprises:
9.2 "POWER ON" light field
The "POWER ON" light field (fig. 10, pos. 2) is on when the power
supply has been switched on.
If a fault is indicated, correct the fault and reset the pump by
switching the power supply off and on.
9.3 Light fields indicating the pump setting
The pump has seven optional settings which can be selected with
the push-button. See fig. 10, pos. 3.
The pump setting is indicated by seven different light fields. See
fig. 11.
Fig. 11 Seven light fields
See section 12. Pump settings and pump performance for
information about the function of the settings.
9.4 Push-button for selection of pump setting
Every time the push-button (fig. 10, pos. 3) is pressed, the pump
setting is changed.
A cycle is seven button presses. See section 9.3 Light fields
indicating the pump setting.
TM04 2526 2013
Pos. Description
1 "POWER ON" light field
2 Seven light fields indicating the pump setting
3 Push-button for selection of pump setting
When the "POWER ON" light field is on only, a fault
preventing the pump from operating properly (for
example seizing-up) has occurred. See section
13. Fault finding the product.
1
2
3
ON
POWER
ALPHA2 L 25-40 180
TM04 2527 2608
Number of
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

English (GB)
12
10. Setting the pump
10.1 Pump setting for system type
Fig. 12 Selection of pump setting for system type
Factory setting = highest proportional-pressure curve (PP2).
Recommended and alternative pump settings according to fig. 12:
* See section 15.1 Guide to performance curves.
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 section 12. Pump settings and pump performance.
10.2 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 section 12. 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
section 12. Pump settings and pump performance.
TM05 1921 4512
I
II
III POWER
ON
I
I
I
II
I
P
O
WER
ON
I
II
III POWER
ON
OK (OK)
I
II
III POWER
ON
I
II
I
I
I
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
ON
OK (OK)
I
II
III POWER
ON I
II
III POWER
ON
I
II
I
I
I
P
O
WER
ER
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*

English (GB)
13
11. Systems with bypass valve between flow and
return pipes
11.1 Purpose of bypass valve
Fig. 13 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, that
is manually operated or thermostatically controlled.
11.2 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 section 10. Setting the pump.
11.3 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 section 12. Pump settings and pump
performance.
TM05 8150 2013
BYPASS
Q min.
1
2
33
I
II
III POWER
ON
OK (OK)
I
II
III POWER
ON
OK (OK)
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)
12 13
ABYPASS

English (GB)
14
12. Pump settings and pump performance
12.1 Relation between pump setting and pump performance
Figure 14 shows the relation between pump setting and pump performance by means of curves. See also section 15. Performance
curves.
Fig. 14 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, depending on the heat demand in the system. See fig. 14.
The head (pressure) is reduced at falling heat demand and increased at rising heat
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, depending on the heat demand in the system. See fig. 14.
The head (pressure) is reduced at falling heat demand and increased at rising heat
demand.
CP1 Lowest constant-
pressure curve
The duty point of the pump will move out or in on the lowest constant-pressure curve,
depending on the heat demand in the system. See fig. 14.
The head (pressure) is kept constant, irrespective of the heat demand.
CP2 Highest constant-
pressure curve
The duty point of the pump will move out or in on the highest constant-pressure curve,
depending on the heat demand in the system. See fig. 14.
The head (pressure) is kept constant, irrespective of the heat demand.
III Speed III
The pump runs at a constant speed and consequently on a constant curve.
In speed III, the pump is set to run on the maximum curve under all operating conditions.
See fig. 14.
Quick venting of the pump can be obtained by setting the pump to speed III for a short
period. See section 5.2 Venting the pump.
II Speed II
The pump runs at a constant speed and consequently on a constant curve.
In speed II, the pump is set to run on the intermediate curve under all operating
conditions. See fig. 14.
I Speed I
The pump runs at a constant speed and consequently on a constant curve.
In speed I, the pump is set to run on the minimum curve under all operating conditions.
See fig. 14.

English (GB)
15
13. Fault finding the product
13.1 Fault finding table
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before starting any
work on the product. Make sure that the power
supply cannot be accidentally switched on.
CAUTION
Pressurised system
Minor or moderate personal injury
- Before dismantling the pump, drain the system or
close the isolating valves on either side of the
pump. The pumped liquid may be scalding hot
and under high pressure.
WARNING
Electric shock
Death or serious personal injury
- A damaged product must be repaired by Grundfos
or a service workshop authorised by Grundfos.
WARNING
Hot surface
Minor or moderate personal injury
- The pump housing may be hot due to the pumped
liquid being scalding hot. Close the isolating valves
on both sides of the pump and wait for the pump
housing to cool down.
Fault Operating panel Cause Remedy
1. The pump does not
run.
Light off.
a) A fuse in the installation is blown. Replace the fuse.
b) The current-operated or voltage-
operated circuit breaker has tripped
out.
Cut in the circuit breaker.
c) The pump is defective. Replace the pump.
"POWER ON" is on only.
a) Power supply failure. The power
supply might be too low.
Check that the power supply falls within
the specified range.
b) The pump is blocked. Remove the impurities.
2. Noise in the system.
Shows normal operating
status.
a) Air in the system. Vent the system. See section
5.3 Venting of heating systems.
b) The flow is too high. Reduce the suction head. See section
12. Pump settings and pump
performance.
3. Noise in the pump.
Shows normal operating
status.
a) Air in the pump. Let the pump run. It vents itself over
time. See section 5.2 Venting the
pump.
b) The inlet pressure is too low. Increase the inlet pressure or check the
air volume in the expansion tank, if
installed.
4. Insufficient heat. Shows normal operating
status.
a) The pump performance is too low. Increase the suction head. See section
12. Pump settings and pump
performance.

English (GB)
16
14. Technical data and installation dimensions
14.1 Technical data
To avoid condensation in the control box and stator, the liquid
temperature must always be higher than the ambient
temperature.
Operating conditions
Relative humidity Maximum 95 % RH
System pressure Maximum 1.0 MPa, 10 bar, 102 m head
Inlet pressure
Liquid temperature Minimum inlet pressure
≤75 °C 0.005 MPa, 0.05 bar, 0.5 m head
90 °C 0.028 MPa, 0.28 bar, 2.8 m head
110 °C 0.108 MPa, 1.08 bar, 10.8 m head
EMC (electromagnetic
compatibility)
EMC Directive (2014/30/EU).
Standards used: EN 55014-1:2006/A1:2009/A2:2011, EN 55014-2:2015, EN 61000-3-2:2014 and
EN 61000-3-3:2013.
Sound pressure level The sound pressure level of the pump is lower than 43 dB(A).
Ambient temperature 0-40 °C
Surface temperature The maximum surface temperature will not exceed 125 °C.
Liquid temperature 2-110 °C
Electrical data
Supply voltage 1 x 230 V ± 10 %, 50/60 Hz, PE
Insulation class F
Miscellaneous data
Motor protection The pump requires no external motor protection.
Temperature class TF110 to EN 60335-2-51
Enclosure class IP42
The pump can run at ambient temperatures higher
than the liquid temperature if the plug connection in
the pump head is pointing downwards
If the temperature of the pumped liquid is lower than
the ambient temperature, make sure that the pump is
installed with the pump head and plug in position 6
o'clock.
Ambient
temperature
[°C]
Liquid temperature
Min.
[°C] Max. [°C]
02110
10 10 110
20 20 110
30 30 110
35 35 90
40 40 70

English (GB)
17
14.2 Installation dimensions, GRUNDFOS ALPHA2 L XX-40, XX-50, XX-60
Dimensional sketches and table of dimensions
Fig. 15 Dimensional sketches, ALPHA2 L XX-40, XX-50, XX-60
* For UK only.
TM04 2533 2608
Pump type Dimensions
L1 B1 B2 B3 B4 H1 H2 H3 G
ALPHA2 L 25-40 180 180 78 78 47 48 26 127 58 1 1/2
ALPHA2 L 32-40 180 180 78 78 47 48 26 127 58 2
ALPHA2 L 15-50 130* 130 78 78 46 49 27 127 58 1 1/2
ALPHA2 L 15-60 130* 130 77 78 46 49 27 129 58 1 1/2
ALPHA2 L 25-60 180 180 78 78 47 48 26 127 58 1 1/2
ALPHA2 L 32-60 180 180 78 77 47 48 26 127 58 2

English (GB)
18
15. Performance curves
15.1 Guide to performance curves
Each pump setting has its own performance curve (Q/H curve).
A power curve (P1 curve) belongs to each Q/H curve. The power curve shows the pump power consumption (P1) in Watt at a given Q/H
curve.
The P1 value corresponds to the value that can be read from the pump display. See fig. 16:
Fig. 16 Performance curves in relation to pump setting
For further information about pump settings, see sections
9.3 Light fields indicating the pump setting
10. Setting the pump
12. Pump settings and pump performance.
15.2 Curve conditions
The guidelines below apply to the performance curves on the
following pages:
• Test liquid: airless water.
• The curves apply to a density of = 983.2 kg/m3and a liquid
temperature of +60 °C.
• All curves show average values and should not be used as
guarantee curves. If a specific minimum performance is
required, individual measurements must be made.
• The curves for speeds I, II and III are marked.
• The curves apply to a kinematic viscosity of = 0.474 mm2/s
(0.474 cSt).
TM04 2534 2608
AUTO
ADAPT
III
II
I
PP1 PP2CP1CP2
Q
P1
H
Q
III
II
I
ON
POWER
Setting Pump curve
PP1 Lowest proportional-pressure curve
PP2
(factory setting) Highest proportional-pressure curve
CP1 Lowest constant-pressure curve
CP2 Highest constant-pressure curve
III Constant speed, speed III
II Constant speed, speed II
I Constant speed, speed I

English (GB)
19
15.3 Performance curves, ALPHA2 L XX-40
Fig. 17 ALPHA2 L XX-40
15.4 Performance curves, ALPHA2 L XX-50
Fig. 18 ALPHA2 L XX-50
TM04 2110 2008
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 Q [m³/h]
0
1
2
3
4
[m]
H
0
10
20
30
40
[kPa]
p
0.0 0.1 0.2 0.3 0.4 0.5 0.6 Q [l/s]
III
II
I
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 Q [m³/h]
0
5
10
15
20
25
[W]
P1
III
II
I
TM04 2109 2008
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 Q [m³/h]
0
1
2
3
4
5
[m]
H
0
10
20
30
40
50
[kPa]
p
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Q [l/s]
III
II
I
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 Q [m³/h]
0
5
10
15
20
25
30
35
[W]
P1
III
II
I

English (GB)
20
15.5 Performance curves, ALPHA2 L XX-60
Fig. 19 ALPHA2 L XX-60
16. Disposing of the product
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
The crossed-out wheelie bin symbol on a product
means that it must be disposed of separately from
household waste. When a product marked with this
symbol reaches its end of life, take it to a collection
point designated by the local waste disposal
authorities. The separate collection and recycling of such
products will help protect the environment and human health.
See also end-of-life information at www.grundfos.com/product-
recycling.
TM04 2108 2008
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8Q [m³/h]
0
1
2
3
4
5
6
[m]
H
0
10
20
30
40
50
60
[kPa]
p
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Q [l/s]
III
II
I
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8Q [m³/h]
0
10
20
30
40
50
[W]
P1
III
II
I