Grundfos ALPHA3 Series User manual

ALPHA3
Model B
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 Grundfos
ALPHA3 model B.
Sections 1-5 give the information necessary to be able to unpack,
install and start up the product in a safe way.
Sections 6-12 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 Target group
1.2 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 Target group 2
1.2 Hazard statements 2
1.3 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
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 8
5.5 Accessories 10
6. Control functions 12
6.1 Operating modes 12
6.2 Control modes 12
6.3 Guide to control mode selection 14
7. Setting the product 15
7.1 Light fields indicating the pump setting 15
7.2 Connecting the pump to Grundfos GO Remote 15
7.3 Grundfos GO Remote menu overview 16
7.4 Setup wizard 16
7.5 Scheduling 17
7.6 Activating and deactivating "Automatic night setback" 17
7.7 Hydronic balancing 18
7.8 Firmware update 18
7.9 Resetting to factory settings 18
7.10 Setting the operating mode using the operating panel 19
8. Servicing the product 19
8.1 Dismantling the product 19
8.2 Dismantling the plug 19
9. Fault finding the product 20
9.1 Fault indication on the pump operating panel 20
9.2 Resetting an alarm or warning 20
9.3 Alarm and warning code logs 20
9.4 Automatic deblocking 20
9.5 Fault finding tables 21
10. Technical data 22
10.1 Dimensions, ALPHA3, XX-40, XX-60, XX-80 23
11. Performance curves 24
11.1 Guide to performance curves 24
11.2 Curve conditions 24
11.3 ALPHA3, XX-40 25
11.4 ALPHA3, XX-60 26
11.5 ALPHA3, XX-80 27
12. Disposing of the product 27
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
1.3 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 the
voltage and frequency of the installation site. See section
5.4.2 Nameplate.
2.2 Scope of delivery
The box contains the following items:
• ALPHA3 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.
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.
WARNING
Electric shock
Death or serious personal injury
- A damaged product must be repaired or replaced
by Grundfos or a service workshop authorised by
Grundfos.
WARNING
Steam
Death or serious personal injury
- The pumped liquid may be scalding hot and under
high pressure. A damaged product must be
repaired or replaced by Grundfos or a service
workshop authorised by Grundfos.
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 ALPHA3
3.2 Pump positions
Always install the pump with a horizontal motor shaft within ± 5 °.
• 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).
Fig. 2 Control box positions
3.3 Control box positions
3.3.1 Positioning of the control box in heating systems
You can position the control box in position 3, 6 and 9 o'clock.
See fig. 3.
Fig. 3 Control box positions, heating systems
TM07 1193 1118
TM07 1116 0218TM07 1121 0218
A B
C
C

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
To change the position of the control box, do as follows:
3.4 Insulating the pump housing
You can reduce the heat loss from the product by insulating the
pump housing with the insulating shells supplied with the pump.
See fig. 5.
Fig. 5 Insulating the pump housing
TM07 1127 0218
Step Action Illustration
1Remove the four
screws.
TM05 5538 3812
2
Turn the pump
head to the
desired position.
You can turn the
control box in
steps of 90 °.
TM05 5539 3812
3
Insert and
cross-tighten the
screws.
TM05 5540 3812
CAUTION
Hot surface
Minor or moderate personal injury
- Position the pump so that persons cannot
accidentally come into contact with hot surfaces.
CAUTION
Pressurised system
Minor or moderate personal injury
- Before dismantling the pump, drain the system or
close the isolating valve on either side of the
pump. 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.
TM05 3058 0912
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 below.
3.5.1 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 mm2
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.
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. 6.
Factory setting
The pump is factory set to radiator mode with AUTOADAPT.
Fig. 6 Starting up the pump
4.2.1 Dry-running protection
The dry-running protection protects the pump against dry running
during startup and normal operation. See section 9. Fault finding
the product.
During first startup and in case of dry-run, the pump will show a
warning. See section 9.5 Fault finding tables.
4.3 Venting the pump
Fig. 7 Venting the pump
Small air pockets trapped inside the pump may cause noise when
starting up the pump. However, because the pump is self-venting
through the system, the noise ceases over a period of time. Still,
we recommend venting the pump in new installations or when the
pipes have been emptied and refilled with water.
Venting the pump at the first startup
When the pump is connected to Grundfos GO Remote, the app
takes you through a setup wizard. See section 7.4 Setup wizard.
When the setup is completed, a "Pump venting" dialogue box
appears after approximately two seconds, which guides you
through the pump venting process.
The venting process lasts 30 minutes.
Venting the pump via the "Assist" menu
You access the "Pump venting" menu in the "Assist" menu. Do as
follows:
1. Connect the pump to Grundfos GO Remote. See section
7.2 Connecting the pump to Grundfos GO Remote.
2. Go to the "Assist" menu and choose "Pump venting". Follow
the instructions given in Grundfos GO Remote. The venting
process lasts 30 minutes.
Fig. 8 Operating panel during venting process
TM07 1126 0218TM07 1192 1118
30 min
TM07 1210 1118
The pump automatically returns to its initial settings
after venting.
The pump must not run dry.
You cannot vent the system through the pump.
ALPHA3

English (GB)
8
5. Product introduction
5.1 Product description
The Grundfos ALPHA3 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.
ALPHA3 is completely controlled with Grundfos GO Remote via
Bluetooth, which gives you step-by-step assistance to pump
configuration, maintenance and repair, including:
• operating and control modes
• scheduling for when the pump should operate and when not
• warning and alarm status with up to 20 entries.
Furthermore, ALPHA3 is able to connect to the Grundfos GO
Balance app, which allows you to hydronically balance two-pipe
radiators and underfloor heating systems in a fast and safe way.
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.
5.3 Pumped liquids
In heating systems, the water must meet the requirements of
accepted standards on water quality in heating systems, for
example the German guideline VDI 2035.
The pump is suitable for the following liquids:
• Thin, clean, 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
approximately 10 mm2/s (10 cSt) and a reduction of the pump
performance by approximately 15 %.
Do not use additives that can 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 10. Technical data.
5.4 Identification
5.4.1 Model type
These installation and operating instructions cover Grundfos
ALPHA3 model B. The model type is stated on the packaging and
nameplate. See figs 9and 10.
Fig. 9 Model type on the packaging
Fig. 10 Model type on the nameplate
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.
TM07 0356 1318TM07 1191 1118

English (GB)
9
5.4.2 Nameplate
Fig. 11 Nameplate
5.4.3 Type key
TM07 0628 1118
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 Frequency [Hz]
11 Data matrix code
12 Grundfos address
13
Production code:
• 1st and 2nd figures: production site code
• 3rd and 4th figures: year
• 5th and 6th figures: week
14 Temperature class
15 Enclosure class
16 Part, according to EEI
17 Crossed-out wheeled bin according to EN 50419
18 Maximum system pressure [MPa]
19 Maximum input power P1 [W]
20 Minimum input power P1 [W]
21 Product type
6
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Example ALPHA3 25 -40 N 180
Pump type
[ ]: Standard version
Nominal diameter (DN) of inlet and outlet
ports [mm]
Maximum head [dm]
[ ]: Cast-iron pump housing
Port-to-port length [mm]

English (GB)
10
5.5 Accessories
5.5.1 Unions and valve kits
Note: The product numbers are always for one complete set, incl. gaskets.
* When ordering for UK 15-xx versions, use product numbers for 25-xx (G 1 1/2).
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
ALPHA3 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
25-xx G 1 1/2 529921 529922 529821 529925 529924 519805 519806 519807 519808 519809 529977 529978 529979
32-xx G 2 509921 509922 529995
Rp
R
Rp
mm
mm
TM07 0558 0218
R
RRp Rc
G
Rc Rp R
Rp

English (GB)
11
5.5.2 Insulating shells, ALPHA3
The pump is supplied with two insulating shells.
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
5.5.3 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.
5.5.4 ALPHA Reader
Fig. 15 ALPHA Reader
When performing hydronic balancing in a heating system, the
Bluetooth signal between the pump and the smart device may
become too weak due to the maximum Bluetooth range of
approximately 10 m. In such cases the ALPHA Reader can be
used as an extender.
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 system 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.
See separate installation and operating instructions.
Pump type Product number
ALPHA3 XX-XX 130 98091786
ALPHA3 XX-XX 180 98091787
TM07 1128 0218
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 functions
6.1 Operating modes
Normal
The pump runs according to the selected control mode.
Stop
The pump stops.
Fig. 16 Operating panel in the Normal and Stop operating
modes
Min.
You can use the minimum curve mode in periods in which a
minimum flow is required. This operating mode is for instance
suitable for manual night setback if automatic night setback is not
desired.
Max.
You can use the maximum curve mode in periods in which a
maximum flow is required.
Fig. 17 Maximum and minimum curves
6.2 Control modes
6.2.1 Radiator mode
If the pump is placed in a two-pipe radiator heating system, we
recommend that the pump operates in "Radiator mode".
The radiator mode uses the AUTOADAPT function to automatically
adjust the pump performance to the actual heat demand in the
system. The pump performance follows a proportional-pressure
curve within the AUTOADAPT range, which is anywhere between
the maximum and minimum proportional curve.
For further information, see section 6.2.4 AUTOADAPT.
Fig. 18 Operating panel in radiator mode
6.2.2 Underfloor mode
If the pump is placed in an underfloor heating system, we
recommend that the pump operates in "Underfloor mode".
The underfloor mode uses the AUTOADAPT function to
automatically adjust the pump performance to the actual heat
demand in the system. The pump performance follows a
constant-pressure curve within the AUTOADAPT range, which is
anywhere between the maximum and minimum constant curve.
For further information, see section 6.2.4 AUTOADAPT.
Fig. 19 Operating panel in underfloor mode
6.2.3 Radiator and underfloor mode
If the pump is placed in a system that consists of both radiator
and underfloor heating, it is possible to select a combination of
the two, called "Radiator & Underfloor mode".
The mode uses the AUTOADAPT function to automatically adjust
the pump performance to the actual heat demand in the system.
The pump performance follows a proportional-pressure curve
within the AUTOADAPT range, which is anywhere between the
maximum and minimum proportional curve.
For further information, see section 6.2.4 AUTOADAPT.
Fig. 20 Operating panel in radiator and underfloor mode
TM07 1195 1218TM07 1001 0918
The pump is factory set to radiator mode.
If operating in a one-pipe system, the pump must be
set to constant pressure. See section 6.2.6 Constant
pressure.
ALPHA3
ALPHA3
Normal Stop.
The [ ] LEDs blink in a
pulsating motion.
H
Q
Maximum
Minimum
TM07 1634 1218TM07 1635 1218TM07 1636 1218
ALPHA3
ALPHA3
ALPHA3

English (GB)
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6.2.4 AUTOADAPT
AUTOADAPT is an integrated function in the radiator, underfloor
and radiator and underfloor mode.
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 either a proportional-pressure curve or
constant-pressure curve within the AUTOADAPT performance
range. See fig. 21.
Fig. 21 AUTOADAPT
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.
6.2.5 Proportional pressure
Proportional-pressure mode adjusts the pump performance to the
actual heat demand in the system, but the pump performance
follows the selected proportional-pressure curve. The selection of
the proportional-pressure setting depends on the characteristics
of the heating system and the actual heat demand.
The curve's setpoint is user defined in the Grundfos GO Remote
app. The setpoint can be chosen anywhere between the minimum
and maximum proportional curve in intervals of 0.1 m. The head
against a closed valve is half the setpoint Hset, although never
below 1 m.
Fig. 22 Proportional-pressure settings
Fig. 23 Operating panel in proportional-pressure mode
6.2.6 Constant pressure
Constant-pressure mode adjusts the pump performance to the
actual heat demand in the system, but the pump performance
follows the selected constant-pressure curve. The selection of the
constant-pressure setting depends on the characteristics of the
heating system and the actual heat demand.
The curve's setpoint is user defined in the Grundfos GO Remote
app. The setpoint can be chosen anywhere between the minimum
and maximum constant-pressure curve in intervals of 0.1 m.
Fig. 24 Constant-pressure settings
Fig. 25 Operating panel in constant-pressure mode
TM07 1002 0918
Pos. Description
1 Constant-pressure curve (underfloor mode)
2Proportional-pressure curve (radiator mode /
radiator and underfloor mode)
3 Setpoint
TM07 1003 0918
TM07 1195 1218
H
Q
H
Q
12
3
AUTOADAPT performance range
3
H
Q
Hset
Hset
2
ALPHA3
TM07 1004 0918
TM07 1637 1218
H
Q
ALPHA3

English (GB)
14
6.2.7 Constant curve
At constant curve, the pump runs at a constant curve
independently of the actual flow rate demand in the system. The
pump performance follows the selected constant curve. The
selection of the constant-curve setting depends on the
characteristics of the heating system and the actual heat
demand.
The curve's setpoint is user defined in the Grundfos GO Remote
app. The speed in % of maximum speed can be chosen
anywhere between the minimum and maximum constant curve in
intervals of 1 %.
Fig. 26 Constant-curve settings
Fig. 27 Operating panel in constant-curve mode
6.2.8 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.
To ensure the optimum function of automatic night setback, the
following conditions must be fulfilled:
• The pump must be installed in the flow pipe.
• The boiler must incorporate automatic control of the liquid
temperature.
To activate "Automatic night setback", follow the instructions in
section 7.6 Activating and deactivating "Automatic night setback".
6.3 Guide to control mode selection
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.
TM07 1005 0918TM07 1195 1218
H
Q
ALPHA3
Do not use automatic night setback when the pump
is installed in the return pipe of the heating system.
Automatic night setback is available in all control
modes. The pump must be set to "Normal" operating
mode.
System type
Pump setting
Recommended Alternative
One-pipe system Constant pressure Constant curve
Two-pipe system Radiator mode Proportional
pressure
Underfloor heating Underfloor mode Constant
pressure
Combined two-pipe and
underfloor heating
system
Radiator and
underfloor mode
Proportional
pressure

English (GB)
15
7. Setting the product
All settings to the pump is made via the Grundfos GO Remote
app, which is available for iOS and Android devices and free of
charge. Grundfos GO Remote connects to the pump via
Bluetooth.
In addition you can select four different operating modes via the
pump’s operating panel. See section 7.10 Setting the operating
mode using the operating panel.
Fig. 28 Operating panel
7.1 Light fields indicating the pump setting
The pump setting is indicated by four light fields in the display.
See fig. 28 (3). The settings are configured via the Grundfos GO
Remote app.
Factory setting
The pump is factory set to radiator mode.
For information about the control settings, see section 6. Control
functions.
7.2 Connecting the pump to Grundfos GO Remote
ALPHA3 is designed to communicate with the Grundfos GO
Remote app. Before connecting, you must download the app.
To connect do as follows:
1. Turn on Bluetooth on your smart device.
2. Open Grundfos GO Remote.
3. Choose to connect via Bluetooth. If you connect via the "List"
button, choose "ALPHA3" from the list.
Follow the instructions given in Grundfos GO Remote.
4. When the pump detects that Grundfos GO Remote is trying to
establish connection, the connectivity symbol on the pump
operating panel starts to flash blue. See fig. 29 (A).
When Grundfos GO Remote is connected to the pump, the
symbol on the operating panel is permanently on. See fig. 29
(B).
Fig. 29 Operating panel when connecting the pump to
Grundfos GO Remote
TM07 0785 0318
Pos. Description
1
QR code: When scanned with Grundfos GO Remote
you get access to detailed product information,
documentation and service information. The QR
scanner is found in the app's side menu.
2 Four light fields indicating the pump setting.
3
Connectivity button: Push-button for connecting the
pump to Grundfos GO Remote and Grundfos GO
Balance.
The button can also be used for setting the pump’s
operating mode.
4
Light field indicating either the actual pump power
consumption in watt or the actual flow rate in m3/h in
steps of 0.1 m3/h during operation.
5Alarm and warning indication. See section 9. Fault
finding the product.
6Connectivity symbol. When lit, the pump is connected
to Grundfos GO Remote.
7
Push-button for selection of parameter to be shown in
the display, that is actual power consumption in watt
or actual flow rate in m3/h.
ALPHA3
1
2
3
4
5
6
7
Active light fields Description
Radiator mode
Underfloor mode
Radiator and underfloor mode
User set control mode
(proportional-pressure,
constant-pressure and constant-curve
mode) including min. and max.
operation mode.
TM07 1211 1118
When the pump connects to Grundfos GO Remote, a
setup wizard automatically pops up after
approximately two seconds.
ALPHA3 ALPHA3
AB

English (GB)
16
7.2.1 Identifying and connecting to a pump in a multiple
pump setup
In order to communicate with a pump in areas with multiple
pumps, do as follows:
1. Turn on Bluetooth on your smart device.
2. Open Grundfos GO Remote.
3. Choose to connect via Bluetooth and tap the "List" button.
4. Grundfos GO Remote shows a list of all the pumps in the
Bluetooth communication range. The connectivity symbol on
the operating panels of all ALPHA3 pumps within the
Bluetooth communication range starts to flash blue. See fig.
29 (A).
5. Identifying a pump
Choose a product from the list. Next:
– Tap the grey icon to the left. See fig. 30 (1).
– Grundfos Eye begins to blink. See fig. 30 (2).
– The connectivity symbol on the corresponding pump starts
to flash blue.
6. Connecting to the pump
When you have identified your pump, tap anywhere on the
box to connect with Grundfos GO Remote. See fig. 30 (3).
Once connection is established, the pump’s connectivity
symbol will be permanently on. See fig. 29 (B). The
connectivity symbol on the remaining pumps will turn off.
Fig. 30 Identifying a pump in Grundfos GO Remote
7.3 Grundfos GO Remote menu overview
7.4 Setup wizard
When connecting the pump to Grundfos GO Remote, a setup
wizard will pop up in the "Dashboard" menu in Grundfos GO
Remote.
The wizard guides you through the selection of the following:
• Application
• Hydronic balancing (optional)
In this step Grundfos GO Remote opens up the Grundfos GO
Balance app, from which the balancing is done.
If you to skip this step in the setup wizard, balancing is done
directly via the Grundfos GO Balance app. See section
7.7 Hydronic balancing.
• Control mode
In proportional-pressure, constant-pressure and
constant-curve mode you will be asked to set the setpoint as
well.
• Naming of the pump.
7.4.1 Pump venting dialogue box
When the setup wizard has completed, a "Pump venting"
dialogue box appears, which guides you through the pump
venting process. We recommend venting the pump in new
installations or when the pipes have been emptied and refilled
with water. For further information, see section 4.3 Venting the
pump.
TM07 1211 1118
Status This menu gives an overview of the
pump's current operating status.
Settings
Here, settings such as operating and
control modes, automatic night setback
and date and time are set. You can
also restore factory settings, see
section 7.9 Resetting to factory
settings, and update firmware, see
section 7.8 Firmware update.
Scheduling
This menu lets you predefine a start
and stop schedule for the pump. See
section 7.5 Scheduling.
Alarms and warnings
Reset any warnings or alarms. Up to
20 entries are saved. See section
9. Fault finding the product.
Assist
This menu guides you through the
pump setup and pump venting as well
as offers recommendations to fault
corrections.
12 3
The pump venting function can also be accessed via
the "Assist" menu.

English (GB)
17
7.5 Scheduling
In some applications it can be useful to predefine a start and stop
schedule for the pump in order to lower energy costs.
The scheduling function allows you to customise the operating
time in several ways:
• Individual schedule for each day of the week: Total
customisation of pump operation cycles.
• 9-to-5 work week template: Inserts an adjustable template for
a typical work week. Suitable when no operation is needed on
weekends.
• Stop at night only.
• Summer mode: Presets the pump to stop operation in a
specific time period and automatically start again.
7.5.1 Scheduling operating periods
To customise the pump's operating periods, do as follows:
1. Connect the pump to Grundfos GO Remote. See section
7.2 Connecting the pump to Grundfos GO Remote.
2. Tap the "Scheduling" menu.
3. Activate the scheduling function by tapping the grey
slide-button in the top right corner of the screen.
4. Choose the weekday for which you want to schedule the
pump performance.
5. Insert a time period by tapping the light grey perimeter of the
clock. Customise the time period by dragging the bar
clockwise or counterclockwise on the light grey perimeter. You
can insert more than one time period per day.
Delete a time period by dragging it outside the clock wheel.
You can assign more weekdays to the schedule by tapping the
weekdays in the bottom of the screen. Days are chosen when
they are shown as green.
7.5.2 Additional settings
"Use template"
This template allows you to select between two schedule
patterns, either "9-to-5 work week" or "Stop at night only".
The "9-to-5 work week" template inserts an adjustable template
for a typical work week.
"Summer mode"
This setting allows you to preset the pump to stop operation in a
specific time period and automatically start again. The pump will
automatically start up at low speed for a short period of time
every day to avoid blocking the rotor as well as sticky valves and
non-return valves. It is not possible to choose a time period that
lies further ahead than one year.
Fig. 31 Operating panel when pump is scheduled to start and
stop
7.6 Activating and deactivating "Automatic night
setback"
To activate or deactivate "Automatic night setback", do as follows:
1. Connect the pump to Grundfos GO Remote. See section
7.2 Connecting the pump to Grundfos GO Remote.
2. Tap the "Settings" menu.
3. Choose "Automatic night setback" and either enable or
disable the function. Press "OK".
When the pump is operating in either proportional-pressure,
constant-pressure or constant-curve control mode, "Automatic
night setback" can also be (de)activated in the "Setpoint" menu
available in the "Dashboard" menu via the "Automatic night
setback" icon:
Fig. 32 Operating panel in "Automatic night setback"
When scheduling is activated, the pump will
automatically run for two minutes every 24 hours at
low speed to avoid blocking the rotor as well as
sticky valves and non-return valves.
In order to avoid damage to property and pipes, the
pump must only operate in "Summer mode" when
there is no risk of the pipes freezing.
TM07 1196 1218
"Automatic night setback" is available in all control
modes. The pump must be set to "Normal" operating
mode.
TM07 1195 1218
ALPHA3
ALPHA3
Normal operation Scheduled stop.
The [ ] LEDs blink in a
pulsating motion.
ALPHA3

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7.7 Hydronic balancing
ALPHA3 allows you to balance two-pipe radiators and underfloor
heating systems. Balancing is primarily used in one- and
two-family houses.
In order to start balancing, you must make sure to have the
Grundfos GO Balance app installed on your smart device. The
app is free of charge and available for both iOS and Android
devices.
Balancing at initial startup
When connecting the pump to Grundfos GO Remote, the setup
wizard asks you whether or not you want to balance your system.
See section 7.4 Setup wizard.
Balancing the system
To balance your system, do as follows:
1. Turn on Bluetooth on your smart device.
2. Open the Grundfos GO Balance app.
3. The app will ask you a few questions before letting you
connect to the pump.
4. Follow the instructions on connecting given by Grundfos GO
Balance.
5. When the pump is connected, the connectivity symbol on the
pump lights blue. See fig. 28 (6).
6. Follow the instructions on balancing given by Grundfos GO
Balance.
7.8 Firmware update
When connecting the pump to Grundfos GO Remote, the app
searches for new firmware updates. If an update is available,
Grundfos GO Remote notifies you and you will be given the
option to update now or later.
Before updating make sure that your smart device fulfils the
following conditions:
• There is sufficient power.
• Your smart device is connected to the pump.
• Your smart device stays within the Bluetooth communication
range.
Fig. 33 Operating panel when updating the firmware
7.9 Resetting to factory settings
The pump can be reset to its factory settings via the "Settings"
menu in Grundfos GO Remote or by using the pump operating
panel. The pump is factory set to radiator mode.
7.9.1 Using Grundfos GO Remote
1. Connect the pump to Grundfos GO Remote. See section
7.2 Connecting the pump to Grundfos GO Remote.
2. Go to the "Settings" menu.
3. Choose "Factory reset".
4. Tap the "Reset user settings to factory" button.
5. Confirm by tapping "Reset".
6. The pump and Grundfos GO Remote disconnect and you will
need to reconnect in order to adjust the pump setting.
7.9.2 Using the pump operating panel
To reset the user settings, press the parameter push-button, see
fig. 28 (7), for 10 s. All LEDs on the operating panel will flash,
followed by a loop sequence. See fig. 34. The pump will now
begin operating according to its factory settings.
Fig. 34 Resetting user settings via the operating panel
Connect the pump to the Grundfos GO Balance app
via Bluetooth. When moving from room to room, the
Bluetooth signal between the pump and the app is
likely to be too weak and the pump and app will
disconnect. In such cases use an ALPHA reader as
extender. See section 5.5.4 ALPHA Reader.
Grundfos GO Balance automatically sets the control
mode according to the information given by the user.
The firmware menu can also be accessed via the
"Settings" menu.
TM07 1305 1218
ALPHA3
Loop sequence
TM07 1196 1218
ALPHA3
Press for 10 s

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19
7.10 Setting the operating mode using the operating
panel
By using the connectivity button you can set four different
operating modes directly on the pump’s operating panel.
The pump is factory set to radiator mode. To change operating
mode press and hold the connectivity button for two seconds.
See fig. 35.
The operating panel will reflect the chosen operating mode. See
section 7.1 Light fields indicating the pump setting. Note that
maximum constant pressure is indicated using the "User set
control mode" light field.
The sequence is as follows:
1. Radiator mode
2. Underfloor mode
3. Radiator and underfloor mode
4. Maximum constant pressure.
Fig. 35 Operating mode sequence when set via the pump’s
operating panel
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
TM07 4592 0519
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.
WARNING
Electric shock
Death or serious personal injury
- A damaged product must be repaired or replaced
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.
WARNING
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.
3 s3 s
3 s
3 s
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 cord.
TM05 5548 3812

English (GB)
20
9. Fault finding the product
9.1 Fault indication on the pump operating panel
Faults preventing the pump from operating properly are indicated
on the operating panel with either a yellow or red LED. A warning
is indicated with yellow and the LED is permanently on. An alarm
is indicated with red and the LED flashes.
For more information about alarms and warnings, see section
9.5 Fault finding tables.
Fig. 36 Warning and alarm indication on the operating panel
9.2 Resetting an alarm or warning
When the pump experiences a fault, use Grundfos GO Remote to
read out alarm codes and texts. Do as follows:
1. Connect the pump to Grundfos GO Remote, see section
7.2 Connecting the pump to Grundfos GO Remote. Grundfos
Eye in the top center of the "Dashboard" menu will be either
yellow or red, indicating either a warning or alarm.
2. Tap Grundfos Eye or choose the "Alarms and warnings" menu
in the list.
3. The menu shows an error code and a short description of the
error.
4. Correct the fault.
5. Tap the "Reset alarm" button.
9.3 Alarm and warning code logs
Grundfos GO Remote will save up to 40 alarms and warnings in
total in the "Alarms and warnings" menu.
9.4 Automatic deblocking
In case of a blocked rotor, the pump will start vibrating
automatically with a frequency of around 3 Hz during startup. Any
dirt deposits that might prevent the impeller from rotating will be
broken up swiftly, and the pump will resume normal operation.
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 or replaced
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.
TM07 1208 1118
ALPHA3
ALPHA3
Warning Alarm
If the pump does not revert to normal duty, the fault is
not corrected. Turning the power off and on again will
not reset the alarm.
Recommendations on how to correct the fault can be
found in the "Assist" menu under "Assisted fault
advise".