Grundfos ALPHA2 Series User manual

ALPHA2
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions describe ALPHA2.
Sections 1-4 give the information necessary to be able to unpack,
install and start up the product in a safe way.
Sections 5-12 give important information about the product, as
well as information on service, fault finding and disposal of the
product.
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 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 4
3.2 Pump positions 4
3.3 Control box positions 4
3.4 Insulating the pump housing 5
3.5 Electrical installation 6
3.6 Assembling the plug 6
4. Starting up the product 7
4.1 Before startup 7
4.2 First startup 7
4.3 Venting the pump 7
5. Product introduction 8
5.1 Product description 8
5.2 Intended use 8
5.3 Pumped liquids 8
5.4 Identification 9
5.5 Accessories 10
5.6 Insulating shells, ALPHA2 11
5.7 ALPHA plugs 11
5.8 ALPHA Reader 11
6. Control modes 12
6.1 AUTOADAPT 12
6.2 Proportional-pressure mode 12
6.3 Constant-pressure mode 12
6.4 Constant curve/constant speed 12
6.5 Automatic night setback 12
6.6 Guide to control mode selection 12
6.7 Pump performance 13
7. Setting the product 14
7.1 Elements on the operating panel 14
7.2 Display 14
7.3 Light fields indicating the pump setting 14
7.4 Button for enabling or disabling of automatic night
setback 15
7.5 Button for selection of pump setting 15
7.6 Setting automatic night setback 15
7.7 Setting manual summer mode 15
7.8 Dry-running protection 15
7.9 Using ALPHA Reader 16
8. Servicing the product 17
8.1 Dismantling the product 17
8.2 Dismantling the plug 17
9. Fault finding the product 18
9.1 High-torque start 18
9.2 Fault finding table 18
10. Technical data 19
10.1 Dimensions, ALPHA2 XX-40, XX-50, XX-60, XX-80 20
11. Performance curves 21
11.1 Guide to performance curves 21
11.2 Curve conditions 21
11.3 Performance curves, ALPHA2 XX-40 (N) 22
11.4 Performance curves, ALPHA2 XX-50 (N) 23
11.5 Performance curves, ALPHA2 XX-60 (N) 24
11.6 Performance curves, ALPHA2 XX-80 (N) 25
12. Disposing of the product 25
Read this document and the quick guide before
installing 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
5.4.2 Nameplate.
2.2 Scope of delivery
The box contains the following items:
• ALPHA2 pump
• ALPHA plug
• insulating shells
•two gaskets
• quick guide.
3. Installing the product
Observe these instructions for explosion-proof
products.
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.
WARNING
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.
The pump must always be installed with a horizontal
motor shaft within ± 5 °.

English (GB)
4
3.1 Mechanical installation
3.1.1 Mounting the product
The arrows on the pump housing indicate the flow direction
through the pump. See fig. 1 (A).
1. Fit the two gaskets supplied with the pump when you mount
the pump in the pipe. See fig. 1 (B).
2. Install the pump with a horizontal motor shaft within ± 5 °. See
fig. 1 (C). See also section 3.2 Pump positions.
3. Tighten the fittings.
Fig. 1 Mounting ALPHA2
3.2 Pump positions
Fig. 2 Control box positions
Always install the pump with a horizontal motor shaft.
• Pump installed correctly in a vertical pipe. See fig. 2 (A).
• Pump installed correctly in a horizontal pipe. See fig. 2 (B).
• Do not install the pump with a vertical motor shaft. See fig. 2
(C and D).
3.3 Control box positions
3.3.1 Positioning of the control box in heating and domestic
hot-water systems
You can position the control box in position 3, 6 and 9 o'clock.
See fig. 3.
Fig. 3 Control box positions, heating and domestic hot-water
systems
TM07 1193 2119
TM07 4605 2119TM07 4606 2119
AB
CD
B

English (GB)
5
3.3.2 Positioning the control box in air-conditioning and
cold-water systems
Position the control box with the plug pointing downwards. See
fig. 4.
Fig. 4 Control box position, air-conditioning and cold-water
systems
3.3.3 Changing the control box position
You can turn the control box in steps of 90 °.
1. Remove the four screws.
2. Turn the pump head to the desired position.
3. Insert and cross-tighten the screws.
Fig. 5 Changing the control box position
3.4 Insulating the pump housing
Fig. 6 Insulating the pump housing
You can reduce the heat loss from the pump by insulating the
pump housing with the insulating shells supplied with the pump.
See fig. 6.
TM07 4607 2119
WARNING
Pressurised system
Death or serious personal injury
- Tighten the bolts before opening the isolating
valves. The pumped liquid may be scalding hot
and under high pressure.
If you change the position of the control box, fill the
system with the liquid to be pumped or open the
isolating valves.
TM07 4608 2119
2
3
TM07 4604 2119
Do not insulate the control box or cover the operating
panel.

English (GB)
6
3.5 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
5.4.2 Nameplate.
• Connect the pump to the power supply with the plug supplied
with the pump. See steps 1 to 7.
3.6 Assembling the plug
WARNING
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.
WARNING
Electric shock
Death or serious personal injury
- Connect the pump to earth.
WARNING
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;
WARNING
Electric shock
Death or serious personal injury
- All electrical connections must be carried out by a
qualified electrician in accordance with local
regulations.
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
12 mm
17 mm
7 mm
Ø 5.5 -10 mm
0.5 - 1.5 mm
2
L
N
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
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 1194 1118
Step Action Illustration

English (GB)
7
4. Starting up the product
4.1 Before startup
Do not start the pump until the system has been filled with liquid
and vented. Make sure that the required minimum inlet pressure
is available at the pump inlet. See section 10. Technical data. For
instructions on how to vent the system, see section 4.3 Venting
the pump.
4.2 First startup
After installing the product, turn on the power supply. The light in
the operating panel shows that the power supply has been
switched on. See fig. 7.
The pump is factory set to AUTOADAPT.
Fig. 7 Starting up the pump
4.3 Venting the pump
Fig. 8 Venting the pump
The pump is self-venting through the system. You do not have to
vent the pump before startup.
Air in the pump may cause noise. This noise ceases when the
pump has run for a few minutes.
You obtain quick venting of the pump by setting the pump to
speed III. How fast the pump is vented depends on the system
size and design.
When you have vented the pump, that is when the noise has
ceased, set the pump according to the recommendations. See
section 6. Control modes.
You cannot vent the system through the pump. See section
5. Product introduction.
WARNING
Pressurised system
Death or serious personal injury
- Tighten the bolts before opening the isolating
valves. The pumped liquid may be scalding hot
and under high pressure.
TM07 4603 2119
1 x 230 V± 10 %
~ 50/60 Hz
0/O
1/On
TM07 462 21191
The pump must not run dry.
30 min

English (GB)
8
5. Product introduction
5.1 Product description
The pump is designed for circulating liquids in systems with
variable flow rates where it is desirable to optimise the setting of
the pump duty point to reduce energy costs.
The table below shows the ALPHA2 models with built-in functions
and features.
Comparison of ALPHA2 models according to built-in functions and features
* Production code (Year-Week).
5.2 Intended use
The pump is designed for circulating liquids in heating and
air-conditioning systems with temperatures equal to or higher
than 2 °C. You can also use pumps with stainless-steel pump
housing in domestic hot-water systems.
5.3 Pumped liquids
The pump is suitable for the following liquids:
• clean, thin, non-aggressive and non-explosive liquids, not
containing solid particles or fibres
• cooling liquids, not containing mineral oil
• softened water.
The kinematic viscosity of water is 1 mm2/s (1 cSt) at 20 °C. If the
pump is used for a liquid with a higher viscosity, the hydraulic
performance of the pump will be reduced.
Example: 50 % glycol at 20 °C means a viscosity of approx. 10
mm2/s (10 cSt) and a reduction of the pump performance by
approx. 15 %.
Do not use additives that can or will disturb the functionality of the
pump.
When selecting a pump, take the viscosity of the pumped liquid
into consideration.
For more information about the pumped liquids, warnings and
operating conditions, see section Comparison of ALPHA2
models according to built-in functions and features.
Functions/features ALPHA2 model B ALPHA2 model C ALPHA2 model D ALPHA2 model E
Starts from PC 12xx* PC 14xx* PC 15xx* PC 17xx*
AUTOADAPT ●●● ●
Proportional pressure ● ● ● ●
Constant pressure ● ● ● ●
Constant curve ● ● ● ●
Automatic night setback ● ● ● ●
Manual summer mode ● ● ●
Dry-running protection ●●
ALPHA Reader compatible ●
High-torque start ●●
ALPHA2XX-40 ● ● ● ●
ALPHA2XX-50 ● ● ● ●
ALPHA2XX-60 ● ● ● ●
ALPHA2XX-80 ● ● ●

English (GB)
9
5.4 Identification
5.4.1 Model type
These installation and operating instructions cover ALPHA2
model B, C, D and E. The model type is stated on the packaging
and nameplate. See figs 9 and 10.
Fig. 9 Model type on the packaging
Fig. 10 Model type on the nameplate
5.4.2 Nameplate
Fig. 11 Nameplate
5.4.3 Type key
TM06 45820 2515TM06 1716 2614
TM05 3079 0912
Pos. Description
1 Minimum rated current [A]
2 Maximum rated current [A]
3 CE mark and approvals
4 EEI: Energy Efficiency Index
5 Voltage [V]
6 Product number
7 Serial number
8 Pump model
9 Country of origin
10 Data matrix code
11 Frequency [Hz]
12
Production code:
• 1st and 2nd figures: year
• 3rd and 4th figures: week
13 Temperature class
14 Enclosure class
15 Crossed-out wheeled bin according to EN 50419
16 Maximum system pressure [MPa]
17 Minimum input power P1 [W]
18 Maximum input power P1 [W]
Example ALPHA2 25 -40 N 180
Pump type
[ ]: Standard version
Nominal diameter (DN) of inlet and outlet
ports [mm]
Maximum head [dm]
[ ]: Cast-iron pump housing
A: Pump housing with air separator
N: Stainless-steel pump housing
Port-to-port length [mm]
7
8
9
6
5
4
3
2
1
17
18
11
10
12
13
14
16
15
P1(W) MPa
I1/1 (A)
Min.
Max.
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MADE IN DENMARK
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English (GB)
10
5.5 Accessories
5.5.1 Unions and valve kits
Note: The product numbers are always for one complete set, including gaskets.
G-threads have a cylindrical form in accordance with the EN ISO
228-1 standard and are not sealing the thread. It requires a flat
gasket. You can only screw male G-threads (cylindrical) into
female G-threads. The G-threads are standard thread on the
pump housing.
R-threads are tapered external threads in accordance with the EN
10226-1 standard.
Rc- or Rp-threads are internal threads with either tapered or
cylindrical (parallel) threads. You can screw male R-threads
(conical) into female Rc- or Rp-threads. See fig. 12.
Fig. 12 G-threads and R-threads
Product numbers, unions
Union nut with internal
threads
Union nut with
external threads
Ball valve with internal
threads
Ball valve with
compression fitting Union nut with soldering fitting
ALPHA2 Connection
3/4 1 1 1/4 1 1 1/4 3/4 1 1 1/4 ∅22 ∅28 ∅18 ∅22 ∅28 ∅42
15-xx* G 1
15-xx N*
25-xx G 1 1/2 529921 529922 529821 529925 529924
25-xx N 529971 529972 519805 519806 519807 519808 519809 529977 529978 529979
32-xx G 2 509921 509922
32-xx N 509971 529995
Rp
R
Rp
mm
mm
TM06 9235 2017
R
RRp Rc
G
Rc Rp R
Rp

English (GB)
11
5.6 Insulating shells, ALPHA2
The pump is supplied with two insulating shells. Type A pumps
with air-separating chamber are not supplied with insulating
shells. However, you can order insulating shells as an accessory.
See table below.
The insulation thickness of the insulating shells corresponds to
the nominal diameter of the pump.
The insulating shells, which are tailored to the individual pump
type, enclose the entire pump housing. The insulating shells are
easy to fit around the pump. See fig. 13.
Fig. 13 Insulating shells
5.7 ALPHA plugs
Fig. 14 ALPHA plugs
* This special cable with an active built-in NTC protection circuit
reduces possible inrush currents. To be used in case of for
instance poor quality of relay components that are sensitive to
inrush current.
5.8 ALPHA Reader
The ALPHA Reader is the receiver and transmitter of pump real
time performance data.
The unit uses a CR2032 lithium battery.
The unit is together with the Grundfos GO Balance app used for
balancing heating systems primarily in one- and two-family
houses. The app is available for both Android and iOS devices,
and you can download it free of charge from Google Play and
App Store.
For further information, see section 7.9 Using ALPHA Reader.
Pump type Product number
ALPHA2 XX-XX 130 98091786
ALPHA2 XX-XX 180 98091787
TM07 4604 2119
TM06 5823 0216
Pos. Description Product
number
1ALPHA straight plug, standard plug
connector, complete 98284561
2ALPHA angle plug, standard angle plug
connection, complete 98610291
3ALPHA plug, 90 ° bend to the left,
including 4 m cable 96884669
4
ALPHA plug, 90 ° bend to the left,
including 1 m cable and integrated NTC
protection resistor*
97844632
123
213, 4
TM06 8574 1517
Description Product number
ALPHA Reader MI401 98916967

English (GB)
12
6. Control modes
6.1 AUTOADAPT
In AUTOADAPT mode, the pump is set to proportional-pressure
control. AUTOADAPT is recommended for two-pipe heating
systems. See section 6.6 Guide to control mode selection.
AUTOADAPT selects the best control curve under the given
operating conditions, meaning that the pump performance is
automatically adjusted to the actual heat demand, that is the size
of the system and the changing heat demand over time, by
continuously selecting a proportional-pressure curve.
You cannot expect an optimum pump setting from day one. If the
power supply fails or is disconnected, the pump stores the
AUTOADAPT setting in an internal memory and resumes the
automatic adjustment when the power supply has been restored.
6.2 Proportional-pressure mode
Proportional-pressure control adjusts the pump performance to
the actual heat demand in the system, but the pump performance
follows the selected performance curve, PP1, PP2 or PP3. See
fig. 15 where PP2 has been selected. The selection of the
proportional-pressure setting depends on the characteristics of
the heating system and the actual heat demand.
Fig. 15 Three proportional-pressure curves
6.3 Constant-pressure mode
The constant-pressure control adjusts the flow rate to the actual
heat demand in the system keeping a constant pressure at the
same time. The pump performance follows the selected
performance curve, CP1, CP2 or CP3. See fig. 16 where CP1 has
been selected. The selection of the constant-pressure setting
depends on the characteristics of the heating system and the
actual heat demand.
Fig. 16 Three constant-pressure curves
6.4 Constant curve/constant speed
At constant-curve/constant-speed operation, the pump runs at a
constant speed, independently of the actual flow rate demand in
the system. The pump performance follows the selected
performance curve, I, II or III. See fig. 17 where II has been
selected. The selection of the constant-curve/constant-speed
setting depends on the characteristics of the heating system and
the number of taps likely to be opened at the same time.
Fig. 17 Three constant curve/constant speed settings
6.5 Automatic night setback
With automatic night setback enabled the pump automatically
changes between normal operation and the automatic night
setback curve.
The pump changes to automatic night setback when a flow-pipe
temperature drop of more than 10 to 15 °C within approximately
two hours is registered. The temperature drop must be at least
0.1 °C/min.
Changeover to normal operation takes place without a time lag
when the flow-pipe temperature has increased by approximately
10 °C. You do not have to re-enable automatic night setback if the
power supply has been switched off.
If the power supply is switched off when the pump is running on
the curve for automatic night setback, the pump starts in normal
operation. The pump changes back to the curve for automatic
night setback when the condition for automatic night setback is
fulfilled again.
If there is insufficient heat in the heating system, check whether
automatic night setback has been enabled. If yes, disable the
function.
6.6 Guide to control mode selection
6.6.1 Changing from recommended to alternative pump
setting
Heating systems are relatively 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.
The pump is factory set to AUTOADAPT.
TM05 3064 0912TM05 3066 0912
PP3
PP2
PP1
Q
H
Q
H
CP3
CP2
CP1
TM05 3068 0912
System type
Pump setting
Recommended Alternative
Two-pipe
heating
system
AUTOADAPT
Proportional-pressure
curve, PP1, PP2 or PP3
One-pipe
heating
system
Constant
curve/constant
speed, I, II or III
Constant-pressure curve
CP1, CP2 or CP3
Underfloor
heating
system
Constant-pressure
curve, CP1, CP2 or
CP3
Constant curve/constant
speed, I, II or III
Domestic hot
water system
Constant
curve/constant
speed, I, II or III
Constant-pressure curve,
CP1, CP2 or CP3
Q
H

English (GB)
13
6.7 Pump performance
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.
Relation between pump setting and pump performance.
Figure 18 shows the relation between pump setting and pump performance by means of curves. See also section 11. Performance
curves.
Fig. 18 Pump setting in relation to pump performance
TM05 2771 2817
Setting Pump curve Function
AUTOADAPT
factory
setting
Highest to lowest
proportional-pressure
curve
The AUTOADAPT function enables the pump to control the pump performance automatically
within a defined performance range. See fig. 18.
• Adjusting the pump performance to the size of the system.
• Adjusting the pump performance to the variations in load over time.
In AUTOADAPT, the pump is set to proportional-pressure control.
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. See fig. 18.
The head is reduced at falling heat demand and increased at rising heat demand.
PP2
Intermediate
proportional-pressure
curve
The duty point of the pump will move up or down on the intermediate proportional-pressure
curve, depending on the heat demand. See fig. 18.
The head is reduced at falling heat demand and increased at rising heat demand.
PP3
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. See fig. 18.
The head 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. 18.
The head is kept constant, irrespective of the heat demand.
CP2
Intermediate
constant-pressure
curve
The duty point of the pump will move out or in on the intermediate constant-pressure curve,
depending on the heat demand in the system. See fig. 18.
The head is kept constant, irrespective of the heat demand.
CP3
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. 18.
The head is kept constant, irrespective of the heat demand.
III Speed III
The pump runs on a constant curve which means that it runs at a constant speed.
In speed III, the pump is set to run on the maximum curve under all operating conditions. See
fig. 18.
You obtain quick venting of the pump by setting the pump to speed III for a short period. See
section 4.3 Venting the pump.
II Speed II
The pump runs on a constant curve which means that it runs at a constant speed.
In speed II, the pump is set to run on the intermediate curve under all operating conditions. See
fig. 18.
I Speed I
The pump runs on a constant curve which means that it runs at a constant speed.
In speed I, the pump is set to run on the minimum curve under all operating conditions. See
fig. 18.
Automatic night
setback or manual
summer mode
The pump changes to the curve for automatic night setback, provided that certain conditions are
met.
III
II
I
H
PP3
CP3
CP2
PP1
CP1
PP2
Q

English (GB)
14
7. Setting the product
7.1 Elements on the operating panel
Fig. 19 Operating panel
7.2 Display
The display (1) is on when you have switched on the power
supply.
The display shows the actual pump power consumption in watt or
the actual flow rate in m3/h in steps of 0.1 m3/h during operation.
Faults preventing the pump from operating properly, for example
a blocked rotor, are indicated in the display by fault codes. See
section 9. Fault finding the product.
If a fault is indicated, correct the fault and reset the pump by
switching the power supply off and on.
7.3 Light fields indicating the pump setting
If the pump impeller is rotated, for example when filling the pump
with water, sufficient energy can be generated to light up the
display even if the power supply has been switched off.
The pump has ten performance settings which you can select
with the button (5). See fig. 19.
The pump setting is indicated by nine light fields in the display.
See fig. 20.
Fig. 20 Nine light fields
For information about the function of the settings, see section
6. Control modes.
WARNING
Hot surface
Death or serious personal injury
- The pump housing may be hot due to the pumped
liquid being scalding hot. Touch only the operating
panel.
TM07 4600 2119
Pos. Description
1Display showing the actual power consumption in
watt or the actual flow rate in m3/h.
2
Light fields indicating the pump setting.
See section 7.3 Light fields indicating the pump
setting.
3Light field indicating the status of automatic night
setback and manual summer mode.
4Button for enabling or disabling of automatic night
setback and manual summer mode.
5 Button for selection of pump setting.
6
Button for selection of parameter to be shown in the
display, i.e. actual power consumption in watt or
actual flow rate in m3/h.
The button is also used to activate the ALPHA
Reader mode on the pump. See section
7.9.1 Activating and deactivating the ALPHA Reader
mode on the pump.
7 Connectivity symbol.
1
2
3
4
5
6
7
TM05 3061 0912
Button
presses Active light fields Description
0 Factory setting AUTOADAPT
1
Lowest
proportional-pressure
curve, PP1
2
Intermediate
proportional-pressure
curve, PP2
3
Highest
proportional-pressure
curve, PP3
4
Lowest
constant-pressure curve,
CP1
5
Intermediate
constant-pressure curve,
CP2
6
Highest
constant-pressure curve,
CP3
7
Constant curve
8
Constant curve
9
Constant curve

English (GB)
15
7.4 Button for enabling or disabling of automatic night
setback
The button enables and disables automatic night setback. See
fig. 19 (4).
Automatic night setback is only relevant for heating systems
prepared for this function. See section 9. Fault finding the
product.
The light field is on when automatic night setback is
active. See fig. 19 (3).
Factory setting: automatic night setback is not active.
If you have set the pump to speed I, II or III, you cannot select
automatic night setback.
7.5 Button for selection of pump setting
Every time you press the button , the pump setting is changed.
See fig. 19 (5).
A cycle is ten button presses. See section 7.3 Light fields
indicating the pump setting
7.6 Setting automatic night setback
If you select speed I, II or III, automatic night setback is disabled.
You do not have to re-enable automatic night setback if the power
supply has been switched off.
If the power supply is switched off when the pump is running on
the curve for automatic night setback, the pump starts in normal
operation. See section 9. Fault finding the product.
The pump changes back to the curve for automatic night setback
when the condition for automatic night setback is fulfilled again.
See section 7.7 Setting manual summer mode.
If there is insufficient heat in the heating system, check whether
automatic night setback has been enabled. If yes, disable the
function.
To ensure the optimum function of automatic night setback, the
following conditions must be fulfilled:
• The pump must be installed in the flow pipe. See fig. 21.
• The boiler must incorporate automatic control of the liquid
temperature.
Fig. 21 Automatic night setback conditions
Enable automatic night setback by pressing . See section
7.4 Button for enabling or disabling of automatic night setback.
Light in means that automatic night setback is active.
7.7 Setting manual summer mode
Manual summer mode is available as from ALPHA2 model C.
In manual summer mode, the pump is stopped to save energy. To
avoid lime precipitation and blocking of the pump, the pump is
started frequently in a short period. This is an alternative to
shutting down the pump if there is a risk of lime deposit.
In manual summer mode, the pump starts frequently at low speed
to avoid blocking the rotor. The display is turned off.
If any alarms occur during manual summer mode, no alarms will
be shown. When manual summer mode is deactivated again, only
the actual alarms will be displayed.
If the automatic night setback mode is enabled before setting the
manual summer mode, the pump will return to automatic night
setback mode after manual summer mode.
7.7.1 Activating manual summer mode
Activate the manual summer mode by pressing the automatic
night setback button 3 to 10 seconds. See fig. 23. The green light
field flashes quickly. After a short while the display turns off and
the green light field flashes slowly.
Fig. 22 Automatic night setback button
7.7.2 Deactivating manual summer mode
Deactivate the manual summer mode by pressing any of the
buttons. Then the pump returns to the previous mode and setting.
7.8 Dry-running protection
The dry-running protection protects the pump against dry running
during start and normal operation. See section 9. Fault finding the
product.
During first startup and in case of dry running, the pump will
operate for 30 minutes before stopping. During this period the
pump displays the error code "E4 - "- -"".
Dry-running protection is available as from ALPHA2 model D.
Do not use automatic night setback when the pump
is installed in the return pipe of the heating system.
TM06 1251 2014
There is a risk of lime deposit in case of a long
standstill period.
TM05 3149 1112

English (GB)
16
7.9 Using ALPHA Reader
Fig. 23 ALPHA Reader
The ALPHA Reader provides safe readout of internal data from
the pump to an Android or iOS-based device via Bluetooth.
The unit is together with the Grundfos GO Balance app used for
balancing heating systems primarily in one- and two-family
houses. The app guides you through a number of steps where
information on installation and measurements from the pump is
being collected. In a two-pipe radiator heating system or an
underfloor heating system, the app calculates the balancing
values for each of the valves. On the basis of these values, the
app guides you through the adjustment of each presetting valve
in the system.
For further information on how to set the ALPHA Reader and
perform hydronic balancing, see the ALPHA Reader
documentation in Grundfos Product Center on
www.grundfos.com.
7.9.1 Activating and deactivating the ALPHA Reader mode on
the pump
1. Press [W/m3/h] and hold it for 3 seconds.
2. ALPHA Reader is either activated or deactivated, depending
on the previous state. When ALPHA Reader is active, the unit
indicator in the display [W/m3/h] flashes rapidly.
See separate installation and operating instructions for further
information on how to use the ALPHA Reader.
See also section 5.8 ALPHA Reader.
TM06 4452 2315
The ALPHA Reader is compatible as from ALPHA2
model E. A connectivity symbol on the pump
indicates compatibility with the ALPHA Reader. See
fig. 23.
You can activate and deactivate the ALPHA Reader
mode in all pump modes.

English (GB)
17
8. Servicing the product
8.1 Dismantling the product
1. Switch off the power supply.
2. Pull out the plug. For instructions on how to dismantle the
plug, see section 8.2 Dismantling the plug.
3. Close the two isolating valves on both sides of the pump.
4. Loosen the fittings.
5. Remove the pump from the system.
8.2 Dismantling the plug
WARNING
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
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. Slowly loosen the screws and
unpressurise the system. The pumped liquid may
be scalding hot and under high pressure.
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.
WARNING
Hot liquid
Death or serious personal injury
- Before dismantling the pump, drain the system or
close the isolating valves on both sides of the
pump. Slowly loosen the screws and unpressurise
the system. The pumped liquid may be scalding
hot and under high pressure.
CAUTION
Crushing of feet
Minor or moderate personal injury
- Wear safety shoes when handling the product.
CAUTION
Sharp element
Minor or moderate personal injury
- Use protective gloves when servicing the product.
Step Action Illustration
1
Loosen the cable
gland and remove it
from the plug.
TM05 5545 3812
2
Pull off the plug cover
while pressing on both
sides.
TM05 5546 3812
3
Add the conductor
guide plate to loosen
all three cable
conductors at the
same time.
If the guide plate is
missing, then loosen
the cable conductors
one by one by
pressing a screwdriver
gently into the terminal
clip.
TM05 5547 3812
4
The plug has now
been removed from
the power supply plug.
TM05 5548 3812

English (GB)
18
9. Fault finding the product
9.1 High-torque start
If the shaft is blocked and you cannot start the pump, the display
indicates the alarm "E1 - "- -"", with a delay of 30 minutes.
The pump attempts to restart until the pump is powered off.
During the start attempts, the pump vibrates due to the
high-torque load.
High-torque start is available as from ALPHA2 model D.
9.2 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.
Cut in the circuit breaker.
c) The pump is defective. Replace the pump.
Changes between "- -"
and "E 1".
a) The rotor is blocked. Remove the impurities.
Changes between "- -"
and "E 2".
a) Insufficient supply voltage. Make sure that the supply voltage falls
within the specified range.
Changes between "- -"
and "E 3".
a) Electrical fault. Replace the pump.
Changes between "- -"
and "E 4".
a) Dry-running protection. Make sure that there is sufficient liquid in
the pipe system. Reset the warning by
pressing any button or switch off the
power supply.
2. Noise in the system. No warning is indicated
on the display.
a) Air in the system. Vent the system.
See section 4.3 Venting the pump.
b) The flow rate is too high. Reduce the suction head.
3. Noise in the pump. No warning is indicated
on the display.
a) Air in the pump. Let the pump run. The pump vents itself
over time.
b) The inlet pressure is too low. Increase the inlet pressure, or make
sure that the air volume in the expansion
tank is sufficient, if installed.
4. Insufficient heat. No warning is indicated
on the display.
a) The pump performance is too low. Change the pump setting to increase the
pump performance. See section
6.6.1 Changing from recommended to
alternative pump setting.

English (GB)
19
10. 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
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
Power consumption in
manual summer mode < 0.8 watt
Miscellaneous data
Motor protection The pump requires no external motor protection.
Temperature class TF110 to EN 60335-2-51
Enclosure class IPX4D
Specific EEI values
ALPHA2 XX-40: EEI ≤ 0.15
ALPHA2 XX-50: EEI ≤ 0.16
ALPHA2 XX-60: EEI ≤ 0.17
ALPHA2 XX-80: EEI ≤ 0.18
Ambient temperature
[°C]
Minimum liquid temperature
[°C]
02
10 10
20 20
30 30
35 35
40 40
The pump can run at ambient temperatures slightly
higher than the liquid temperature if the plug
connection in the pump head is pointing downwards.

English (GB)
20
10.1 Dimensions, ALPHA2 XX-40, XX-50, XX-60, XX-80
Dimensional sketches and table of dimensions.
TM05 2364 5011
Pump type
Dimensions
L1 B1 B2 B3 B4 H1 H2 H3 G
ALPHA2 15-40 130 130 54 54 44 44 36 104 47 G 1
ALPHA2 15-50 130 130 54 54 44 44 36 104 47 G 1*
ALPHA2 15-60 130 130 54 54 44 44 36 104 47 G 1*
ALPHA2 15-80 130 130 54 54 44 44 36 104 47 G 1
ALPHA2 25-40 130 130 54 54 44 44 36 104 47 G 1 1/2
ALPHA2 25-40 N 130 130 54 54 44 44 37 104 47 G 1 1/2
ALPHA2 25-50 130 130 54 54 44 44 36 104 47 G 1 1/2
ALPHA2 25-50 N 130 130 54 54 44 44 37 104 47 G 1 1/2
ALPHA2 25-60 130 130 54 54 44 44 36 104 47 G 1 1/2
ALPHA2 25-60 N 130 130 54 54 44 44 37 104 47 G 1 1/2
ALPHA2 25-80 130 130 54 54 44 44 36 104 47 G 1 1/2
ALPHA2 25-80 N 130 130 54 54 44 44 37 104 47 G 1 1/2
ALPHA2 25-40 180 180 54 54 44 44 36 104 47 G 1 1/2
ALPHA2 25-40 N 180 180 54 54 44 44 37 104 47 G 1 1/2
ALPHA2 25-50 180 180 54 54 44 44 36 104 47 G 1 1/2
ALPHA2 25-50 N 180 180 54 54 44 44 37 104 47 G 1 1/2
ALPHA2 25-60 180 180 54 54 44 44 36 104 47 G 1 1/2
ALPHA2 25-60 N 180 180 54 54 44 44 3 104 47 G 1 1/2
ALPHA2 25-80 180 180 54 54 44 44 36 104 47 G 1 1/2
ALPHA2 25-80 N 180 180 54 54 44 44 37 104 47 G 1 1/2
ALPHA2 32-40 180 180 54 54 44 44 36 104 47 G 2
ALPHA2 32-40 N 180 180 54 54 44 44 37 104 47 G 2
ALPHA2 32-50 180 180 54 54 44 44 36 104 47 G 2
ALPHA2 32-50 N 180 180 54 54 44 44 37 104 47 G 2
ALPHA2 32-60 180 180 54 54 44 44 36 104 47 G 2
ALPHA2 32-60 N 180 180 54 54 44 44 37 104 47 G 2
ALPHA2 32-80 180 180 54 54 44 44 36 104 47 G 2
ALPHA2 32-80 N 180 180 54 54 44 44 37 104 47 G 2