Grundfos ALPHA2 Series User manual

ALPHA2 / ALPHA3
ALPHA SOLAR
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,
ALPHA3 and ALPHA SOLAR.
Sections 1-5 give the information necessary to be able to unpack,
install and start up the product in a safe way.
Sections 6-17 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. General information 2
1.1 Target group 2
1.2 Symbols used in this document 3
2. Receiving the product 3
2.1 Inspecting the product 3
2.2 Scope of delivery 3
3. Installing the product 4
3.1 Mechanical installation 4
3.2 Control box positions, ALPHA2, ALPHA3 4
3.3 Control box positions, ALPHA SOLAR 5
3.4 Insulating the pump housing 6
4. Electrical installation 6
4.1 Assembling the plug 7
4.2 Dismantling the plug 8
4.3 Electrical installation, ALPHA SOLAR 9
4.4 Power supply connection, ALPHA SOLAR 9
4.5 Control signal connection, ALPHA SOLAR 9
5. Starting up the product 9
5.1 Before startup 9
5.2 First startup 9
5.3 Venting the pump 10
5.4 Venting the heating system 10
6. Product introduction 11
6.1 Product description 11
6.2 Applications 12
6.3 Pumped liquids 12
6.4 Identification 13
7. Control functions 13
7.1 Elements on the control panel 13
7.2 Display 14
7.3 Light fields indicating the pump setting 14
7.4 Light field indicating the status of automatic night
setback 14
7.5 Button for enabling or disabling of automatic night
setback 14
7.6 Button for selection of pump setting 14
7.7 Control modes 15
7.8 Pump performance 17
7.9 Bypass valve 18
8. Operating the product 18
8.1 Using automatic night setback 18
8.2 Function of automatic night setback 19
8.3 Setting manual summer mode 19
8.4 Dry-running protection 19
8.5 ALPHA Reader 19
8.6 High-torque start 19
9. Fault finding the product 20
10. Technical data 21
10.1 Data and operating conditions 21
10.2 Dimensions, ALPHA2 and ALPHA3, XX-40, XX-50,
XX-60, XX-80 22
10.3 Dimensions, ALPHA2 and ALPHA3, 25-40 A, 25-60 A 23
11. Performance curves 24
11.1 Guide to performance curves 24
11.2 Curve conditions 24
11.3 Performance curves, ALPHA2 and ALPHA3, XX-40 (N) 25
11.4 Performance curves, ALPHA2 and ALPHA3, XX-50 (N) 26
11.5 Performance curves, ALPHA2 and ALPHA3, XX-60 (N) 27
11.6 Performance curves, ALPHA2 and ALPHA3, 25-40 A 28
11.7 Performance curves, ALPHA2 and ALPHA3, 25-60 A 29
11.8 Performance curves, ALPHA2 and ALPHA3, XX-80 (N) 30
12. Accessories 31
12.1 Unions and valve kits 31
12.2 Insulating shells, ALPHA2, ALPHA3 31
12.3 ALPHA plugs 32
12.4 ALPHA Reader 32
13. ALPHA SOLAR 32
13.1 Product introduction 32
13.2 Operating the product 33
13.3 Setting by means of the control panel 33
13.4 Operating and alarm status 33
13.5 Fault finding the product 34
14. External PWM control mode and signals 35
15. Digital signal converter 35
16. Technical data 35
17. Disposing of the product 37
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.

English (GB)
3
1.2 Symbols used in this document
1.2.1 Warnings against hazards involving risk of death or
personal injury
The text accompanying the three hazard symbols DANGER,
WARNING and CAUTION is structured in the following way:
1.2.2 Other important notes
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
6.4.1 Nameplate.
2.2 Scope of delivery
The box contains the following items:
• ALPHA2, ALPHA3 or ALPHA SOLAR pump
• ALPHA plug
• insulating shells
• two gaskets
• quick guide.
ALPHA SOLAR is delivered without insulating shells but with a
plug designed for ALPHA SOLAR.
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.
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.

English (GB)
4
3. Installing the product
3.1 Mechanical installation
3.1.1 Mounting the product
Fig. 1 Mounting ALPHA2 or ALPHA3
The arrows on the pump housing indicate the flow direction
through the pump. See fig. 1, pos. A.
See section 10.2 Dimensions, ALPHA2 and ALPHA3, XX-40,
XX-50, XX-60, XX-80 or section 10.3 Dimensions, ALPHA2 and
ALPHA3, 25-40 A, 25-60 A.
1. Fit the two gaskets when you mount the pump in the pipe. See
fig. 1, pos. B.
2. Install the pump with a horizontal motor shaft. See fig. 1, pos.
C. See also section 3.2 Control box positions, ALPHA2,
ALPHA3.
3. Tighten the fittings.
3.2 Control box positions, ALPHA2, ALPHA3
Fig. 2 Control box positions
Always install the pump with a horizontal motor shaft.
• Pump installed correctly in a vertical pipe. See fig. 2, pos. A.
• Pump installed correctly in a horizontal pipe. See fig. 2, pos. B.
• Do not install the pump with a vertical motor shaft. See fig. 2,
pos. C and D.
3.2.1 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
TM05 3057 0612
TM05 2919 0912TM05 3146 0912

English (GB)
5
3.2.2 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
3.2.3 Changing the control box position
Fig. 5 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.
3.3 Control box positions, ALPHA SOLAR
Fig. 6 Control box positions, ALPHA SOLAR
Always install the pump with horizontal motor shaft. Position the
control box in position 9 o'clock. See fig. 7.
Fig. 7 Position of the ALPHA SOLAR control box
You can turn the control box in steps of 90 °.
TM05 3151 1212TM05 3147 1212
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.
TM06 5636 5115TM06 5831 0616

English (GB)
6
3.4 Insulating the pump housing
Fig. 8 Insulating the pump housing
You can reduce the heat loss from the ALPHA2 or ALPHA3 pump
by insulating the pump housing with the insulating shells supplied
with the pump. See fig. 8.
4. Electrical installation
Carry out the electrical connection and protection in accordance
with local regulations.
• The motor requires no external motor protection.
• Check that the supply voltage and frequency correspond to
the values stated on the nameplate. See section
6.4.1 Nameplate.
• Connect the pump to the power supply with the plug supplied
with the pump. See steps 1 to 7.
TM05 3058 0912
Do not insulate the control box or cover the control
panel.
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.
Connect the pump to an external main switch with
a minimum contact gap of 3 mm in all poles.
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;

English (GB)
7
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
Ø55 10mm
0.5 - 1.5 mm2
0.5 - 1.5 mm2
12 mm
∅5.5 - 10 mm
7 mm
17 mm
L
N
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.
TM05 3058 0912
Step Action Illustration

English (GB)
8
4.2 Dismantling the plug
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)
9
4.3 Electrical installation, ALPHA SOLAR
Fig. 9 Control box connections
4.4 Power supply connection, ALPHA SOLAR
Connect the pump to the power supply with the Superseal power
connector.
Fig. 10 Superseal power connector
4.5 Control signal connection, ALPHA SOLAR
If you do not need the signal connection, cover it with a blanking
plug. See fig. 9.
You can control the pump with a low-voltage PWM (pulse-width
modulation) signal.
The PWM signal is a method for generating an analog signal
using a digital source.
The control signal connection has three conductors: signal input,
signal output and signal reference. See fig. 11. Connect the cable
to the control box with a Mini Superseal plug. The signal cable
can be supplied with the pump as an accessory.
Fig. 11 Mini Superseal plug
5. Starting up the product
5.1 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 sections 5.3 Venting
the pump and 5.4 Venting the heating system.
5.2 First startup
After installing the product, see section 3. Installing the product,
turn on the power supply. The light in the control panel shows that
the power supply has been switched on. See fig. 12.
The pump is factory set to AUTOADAPT.
Fig. 12 Starting up the pump
TM06 5819 0216TM06 9076 2617
DANGER
Electric shock
Death or serious personal injury
- Connect the pump to earth.
Connect the pump to an external main switch with
a minimum contact gap of 3 mm in all poles.
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;
L
PE
N
TM06 9076 2617
TM05 3058 0912
IN
REF
OUT
0
1
1 x 230 V ± 10 % ∽ 50/60 Hz

English (GB)
10
5.3 Venting the pump
Fig. 13 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 for a short period. How fast the pump is vented depends
on the system size and design.
When you have vented the pump, i.e. when the noise has
ceased, set the pump according to the recommendations. See
section 7. Control functions.
You cannot vent the system through the pump. See section
5.4 Venting the heating system.
5.4 Venting the heating system
Fig. 14 Venting of the heating system
Vent the heating system as follows:
• via a vent valve installed above the pump (1)
• via a pump housing with air separator (2).
In heating systems that often contain much air, we recommend
that you install pumps with pump housing with air separator, i.e.
ALPHA2 or ALPHA3 XX-XX A.
When the heating system has been filled with liquid, do as
follows:
1. Open the vent valve.
2. Set the pump to speed III.
3. Let the pump run for a short period
4. Set the pump according to the recommendations. See section
7. Control functions.
Repeat the procedure, if necessary.
TM05 3075 0912
The pump must not run dry.
10 Min.
1
2
TM03 8931 2707
The pump must not run dry.
W
40 180
A
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
40
4
4
4
4
40
0
0
4
4
4
4
0
0
4
40
4
4
4
4
40
0
4
4
0
4
4
4
0
18
0
A
A
A
A
10 Min.
2
1
3

English (GB)
11
6. Product introduction
6.1 Product description
Fig. 15 Pumped liquids, warnings and operating conditions
ALPHA2 and ALPHA3 are a complete range of circulator pumps.
6.1.1 Model type
These installation and operating instructions cover ALPHA2
model B, C, D and E, and ALPHA3 model A. The model type is
stated on the packaging and nameplate. See figs 16 and 17.
Fig. 16 Model type on the packaging
Fig. 17 Model type on the nameplate
TM05 3055 0912TM05 3056 0912
1
2
3Max. 95 %RH
IPX4D
Min./Max.
+2 °C / +110 °C
Max. 1.0 MPa
(10 bar)
4
5
6
7
Min./Max.
0 C / +40
< 43 db(A)
°°C
TM06 45820 2515TM06 1716 2614

English (GB)
12
The table below shows the ALPHA2 and APLHA3 models with built-in functions and features.
* Production code (Year-Week).
** Not available in all countries.
6.2 Applications
The ALPHA2 and ALPHA3 circulator pumps are designed for the
circulation of water in heating systems, domestic hot-water
systems as well as air-conditioning and cold-water systems.
Cold-water systems are defined as systems where the ambient
temperature is higher than the temperature of the pumped liquid.
ALPHA2 and ALPHA3 are the best choices for the following
systems:
• underfloor heating systems
• one-pipe systems
• two-pipe systems.
ALPHA2 and ALPHA3 are suitable for the following:
• Systems with constant or variable flow rates where you want
to optimise the setting of the pump duty point.
• Systems with variable flow-pipe temperature.
• Systems where you want automatic night setback.
• Balancing of domestic heating systems.
6.3 Pumped liquids
In heating systems, the water must meet the requirements of
accepted standards on water quality in heating systems, for
example the German standard 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.
• Domestic hot water
Maximum: 14 °dH
Maximum: 65 °C
Maximum peak: 70 °C.
For water with a higher degree of hardness, we recommend
that you use a direct-coupled TPE pump.
• 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 fig. 15.
Functions/features ALPHA2 model B ALPHA2 model C ALPHA2 model D ALPHA2 model E ALPHA3 model A
Starts from PC 12xx* PC 14xx* PC 15xx* PC 17xx* PC 15xx*
AUTOADAPT ●●●●●
Proportional pressure ●●●●●
Constant pressure ●●●●●
Constant curve ●●●●●
Automatic night setback ●●●●●
Manual summer mode ●●●●
Dry-running protection ●●●
ALPHA Reader compatible ●●
High-torque start ●●●
ALPHA2/3XX-40 ●●●●●
ALPHA2/3XX-50** ●●●●●
ALPHA2/3XX-60 ●●●●●
ALPHA2/3XX-80 ●●●●
CAUTION
Flammable material
Minor or moderate personal injury.
- Do not use the pump for flammable liquids, such
as diesel oil and petrol.
WARNING
Biological hazard
Death or serious personal injury.
- In domestic hot-water systems, the temperature of
the pumped liquid must always be above 50 °C
due to the risk of legionella.
WARNING
Biological hazard
Death or serious personal injury.
- In domestic hot-water systems, the pump is
permanently connected to the mains water.
Therefore, do not connect the pump by a hose.
CAUTION
Corrosive substance
Minor or moderate personal injury.
- Do not use the pump for aggressive liquids, such
as acids and seawater.

English (GB)
13
6.4 Identification
6.4.1 Nameplate
Fig. 18 Nameplate
6.4.2 Type key
7. Control functions
7.1 Elements on the control panel
Fig. 19 Control panel
TM05 3079 2218
Pos. Description
1 Pump type
2
Rated current [A]:
• Min.: Minimum current [A]
• Max.: Maximum current [A]
3 CE mark and approvals
4EEI: Energy Efficiency Index
Part, according to EEI
5 Voltage [V]
6 Product number
7 Serial number
8 Model
9 Country of origin
10
Input power P1 [W]:
• Min.: Minimum input power P1 [W]
• Max.: Maximum input power P1 [W]
11 Maximum system pressure [MPa]
12 Enclosure class
13 Temperature class
14
Production code:
• 1st and 2nd figures: year
• 3rd and 4th figures: week
15 Frequency [Hz]
16 Data matrix code
7
8
9
6
5
4
3
2
1
17
18
11
10
12
13
14
16
15
AUTO
ADAPT
P1(W) MPa
I1/1 (A)
Min.
Max.
((,;;3DUW;
;;;9a;;+],3;;;7);;;
61;;;;;;;;
0RGHO;;;;;;;
MADE IN DENMARK
;;;
;;;
;
;; ;;
31;;;;;;;;
3&;;;;
*UXQGIRV+ROGLQJ$6
'.%MHUULQJEUR'HQPDUN
Example ALPHA2/3 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]
TM05 3060 0912
Pos. Description
1Display showing the actual power consumption in
watt or the actual flow rate in m3/h.
2
Nine 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.
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.
7 Connectivity symbol.
1
2
3
4
5
6
7

English (GB)
14
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.
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.
7.3 Light fields indicating the pump setting
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
7.7 Control modes.
7.4 Light field indicating the status of automatic night
setback
Light in shows that automatic night setback is active. See fig.
19, pos. 3. See also section 7.5 Button for enabling or disabling
of automatic night setback.
7.5 Button for enabling or disabling of automatic night
setback
The button enables and disables automatic night setback. See
fig. 19, pos. 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, pos. 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.
7.6 Button for selection of pump setting
Every time you press the button , the pump setting is changed.
See fig. 19, pos. 5.
A cycle is ten button presses. See section 7.3 Light fields
indicating the pump setting.
TM05 3061 0912
Button
presses Active light fields Description
0factory 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/constant
speed III
8
Constant curve/constant
speed II
9
Constant curve/constant
speed I
10
AUTOADAPT

English (GB)
15
7.7 Control modes
7.7.1 Pump setting for two-pipe heating systems
Fig. 21 Selection of pump setting for system type
Factory setting: AUTOADAPT.
Recommended and alternative pump settings according to fig.
21:
AUTOADAPT
The AUTOADAPT function adjusts the pump performance to the
actual heat demand in the system. As the performance is
adjusted gradually, we recommend that you leave the pump in the
AUTOADAPT mode at least one week before changing the pump
setting.
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.
Proportional-pressure curve, PP1, PP2 or PP3
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. 22 where PP2 has been selected. For further information, see
section 11.1 Guide to performance curves.
Fig. 22 Three proportional-pressure curves/settings
The selection of the proportional-pressure setting depends on the
characteristics of the heating system and the actual heat
demand.
7.7.2 Pump setting for one-pipe heating systems
Fig. 23 Selection of pump setting for system type
Factory setting: AUTOADAPT.
Recommended and alternative pump settings according to fig.
23:
Constant-pressure curve, CP1, CP2 or CP3
Constant-pressure control adjusts the pump performance to the
actual heat demand in the system, but the pump performance
follows the selected performance curve, CP1, CP2 or CP3. See
fig. 24 where CP1 has been selected. For further information, see
section 11.1 Guide to performance curves.
Fig. 24 Three constant-pressure curves and settings
The selection of the constant-pressure setting depends on the
characteristics of the heating system and the actual heat
demand.
TM05 3063 0912
Heating
system
Pump setting
Recommended Alternative
Two-pipe
system AUTOADAPT*Proportional-pressure
curve, PP1, PP2 or PP3*
* See section 11.1 Guide to performance curves.
TM05 3064 0912
Q
H
PP3
PP2
PP1
Q
H
TM05 3065 0912
Heating
system
Pump setting
Recommended Alternative
One-pipe
system
Constant
curve/constant
speed, I, II or III*
Constant-pressure curve
CP1, CP2 or CP3*
* See section 11.1 Guide to performance curves.
TM05 3066 0912
Q
H
Q
H
CP3
CP2
CP1

English (GB)
16
7.7.3 Pump setting for underfloor heating systems
Fig. 25 Selection of pump setting for system type
Factory setting: AUTOADAPT.
Recommended and alternative pump settings according to fig.
25:
Constant-pressure curve, CP1, CP2 or CP3
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. 26 where CP1 has
been selected. For further information, see section 11.1 Guide to
performance curves.
Fig. 26 Three constant-pressure curves or settings
The selection of the constant-pressure setting depends on the
characteristics of the heating system and the actual heat
demand.
7.7.4 Pump setting for domestic hot-water systems
Fig. 27 Selection of pump setting for system type
Factory setting: AUTOADAPT.
Recommended and alternative pump settings according to fig.
27:
Constant curve/constant speed, I, II or III
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. 28 where II has been
selected. For further information, see section 11.1 Guide to
performance curves.
Fig. 28 Three constant curve/constant speed settings
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.
7.7.5 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.
TM05 3067 0912
System type
Pump setting
Recommended Alternative
Underfloor
heating
Constant-pressure
curve, CP1, CP2 or
CP3*
Constant curve/constant
speed, I, II or III
* See section 11.1 Guide to performance curves.
TM05 3066 0912
Q
H
Q
H
CP3
CP2
CP1
TM05 3068 0912
System type
Pump setting
Recommended Alternative
Domestic hot
water
Constant curve/constant
speed, I, II or III
Constant-pressure
curve, CP1, CP2 or
CP3*
* See section 11.1 Guide to performance curves.
TM05 3068 0912
Q
H
Q
H

English (GB)
17
7.8 Pump performance
Relation between pump setting and pump performance.
Figure 29 shows the relation between pump setting and pump
performance by means of curves. See also section
11. Performance curves.
Fig. 29 Pump setting in relation to pump performance
TM05 2771 2817
III
II
I
H
PP3
CP3
CP2
PP1
CP1
PP2
Q
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. 29.
• 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. 29.
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. 29.
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. 29.
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. 29.
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. 29.
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. 29.
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.
29.
You obtain quick venting of the pump by setting the pump to speed III for a short period. See
section 5.3 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. 29.
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.
29.
Automatic night
setback or manual
summer mode
The pump changes to the curve for automatic night setback, i.e. absolute minimum performance
and power consumption, provided that certain conditions are met. In manual summer mode, the
pump is stopped to save energy and only the electronics are running. To avoid lime precipitation
and blocking of the pump, the pump is started frequently in a short period. See section 9. Fault
finding the product.

English (GB)
18
7.9 Bypass valve
Fig. 30 Systems with 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 available when all valves are closed.
The pump setting depends on the type of bypass valve used, i.e.
manually operated or thermostatically controlled.
7.9.1 Setting the bypass valve
Manually operated
1. Adjust the bypass valve with the pump in setting I (speed I).
2. Observe the minimum flow rate of the system. See the
manufacturer's instructions.
3. After setting the bypass valve, set the pump according to
7. Control functions.
Automatically operated, thermostatically controlled
1. Adjust the bypass valve with the pump in setting I (speed I).
2. Observe the minimum flow rate for the system. Consult the
manufacturer's instructions.
After adjusting the bypass valve, set the pump to the lowest or
highest constant-pressure curve. For further information about
pump settings in relation to performance curves, see section
9. Fault finding the product.
8. Operating the product
8.1 Using automatic night setback
Fig. 31 Automatic night setback activated
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 8.2 Function of automatic night setback.
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. 31.
• The boiler must incorporate automatic control of the liquid
temperature.
Enable automatic night setback by pressing . See section
7.5 Button for enabling or disabling of automatic night setback.
Light in means that automatic night setback is active.
TM05 3076 0912
ALP
A
HA2 L
AUTO
BYPASS
1
2Q min.
33
A
TM06 1251 2014
Do not use automatic night setback when the pump
is installed in the return pipe of the heating system.

English (GB)
19
8.2 Function of automatic night setback
Once you have enabled automatic night setback, the pump
automatically changes between normal duty and automatic night
setback. See section 9. Fault finding the product.
Changeover between normal duty and automatic night setback
depends on the flow-pipe temperature.
The pump automatically changes over to automatic night setback
when a flow-pipe temperature drop of more than 10 to 15 °C
within approx. two hours is registered. The temperature drop
must be at least 0.1 °C/min.
Changeover to normal duty takes place without a time lag when
the flow-pipe temperature has increased by approx. 10 °C.
8.3 Setting manual summer mode
Manual summer mode is available as from ALPHA2 model C and
ALPHA3 model A.
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.
8.3.1 Activating manual summer mode
Activate the manual summer mode by pressing the automatic
night setback button 3 to 10 seconds. See fig. 31. The green light
field flashes quickly. After a short while the display turns off and
the green light field flashes slowly.
Fig. 32 Automatic night setback button
8.3.2 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.
8.4 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-run, 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 and
ALPHA3 model A.
8.5 ALPHA Reader
The ALPHA Reader provides safe readout of internal data from
the pump to an Android or iOS-based mobile device via
Bluetooth. Together with the Grundfos GO Balance app the
ALPHA Reader allows you to balance two-pipe radiators and
underfloor heating systems in a fast and safe way. For further
information, see section 12.4 ALPHA Reader.
Fig. 33 ALPHA Reader
8.5.1 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.
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.
8.6 High-torque start
If the shaft is blocked and you cannot start the pump, the display
indicates the alarm "E1 - "- -"", with a delay of 20 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 and
ALPHA3 model A.
There is a risk of lime deposit in case of a long
standstill period.
TM05 3149 1112
The ALPHA Reader is compatible as from ALPHA2
model E and ALPHA3 model A only. A connectivity
symbol on the pump indicates compatibility with the
ALPHA Reader. See fig. 33.
TM06 4452 2315
You can activate and deactivate the ALPHA Reader
mode in all pump modes.

English (GB)
20
9. Fault finding 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
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.
Fault Control 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 5.4 Venting the heating
system.
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.
See section 5.3 Venting the pump.
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. Increase the suction head.