Grundfos MAGNA1 C User manual

New MAGNA1
Model C
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

English (GB)
3
English (GB) Installation and operating instructions
Original installation and operating instructions
CONTENTS
These installation and operating instructions describe New
MAGNA1 model C.
Sections 1-5 give the information necessary to be able to unpack,
install and start up the product in a safe way.
Sections 6-11 give important information about the product, as
well as information on service, fault finding and disposal of the
product.
Page
1. General information
1.1 Symbols used in this document
The text accompanying the three hazard symbols DANGER,
WARNING and CAUTION is structured in the following way:
1.2 Safety symbols on the pump
1. General information 3
1.1 Symbols used in this document 3
1.2 Safety symbols on the pump 3
2. Receiving the product 4
2.1 Inspecting the product 4
2.2 Scope of delivery 4
2.3 Lifting the pump 4
3. Installing the product 5
3.1 Location 5
3.2 Tools 5
3.3 Mechanical installation 5
3.4 Electrical installation 8
4. Starting up the product 12
4.1 Single-head pump 12
4.2 Twin-head pump 12
4.3 Connecting the pump to Grundfos GO 12
5. Handling and storing the product 13
5.1 Storing the product 13
6. Product introduction 13
6.1 Applications 13
6.2 Pumped liquids 13
6.3 Identification 14
6.4 Insulating shells 14
6.5 Non-return valve 14
7. Control functions 15
7.1 Proportional-pressure curve (PP1, PP2 or PP3) 15
7.2 Constant-pressure curve (CP1, CP2 or CP3) 16
7.3 Constant curve (I, II or III) 16
7.4 Overview of control functions 17
7.5 Selecting control function 18
7.6 Operating the product 19
7.7 Pairing and unpairing twin-head pumps 20
7.8 Communication, control and monitoring 21
8. Fault finding the product 22
8.1 Grundfos Eye operating status 22
8.2 Fault finding 22
8.3 Fault finding table 24
9. Accessories 25
9.1 Insulating kits for air-conditioning and cooling systems 25
9.2 Blanking flanges 25
9.3 Counterflanges 25
10. Technical data 26
11. Disposing of the product 26
Prior to installation, read this document and the quick
guide. 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.
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.
Notes or instructions that make the work easier and
ensure safe operation.
Check the position of the clamp before you tighten
the clamp. Incorrect position of the clamp will cause
leakage from the pump and damage the hydraulic
parts in the pump head.
Fit and tighten the screw holding the clamp to 8 Nm ±
1 Nm.
Do not apply more torque than specified even though
water is dripping from the clamp. The condensed
water is most likely coming from the drain hole under
the clamp.
8Nm!

English (GB)
4
2. Receiving the product
2.1 Inspecting the product
Check that the product 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
6.3.1 Nameplate.
2.2 Scope of delivery
2.2.1 Terminal-connected single-head pump
Fig. 1 Terminal-connected single-head pump
The box contains the following items:
• MAGNA1-pump
• insulating shells
•gaskets
• quick guide
• safety instructions
• box with terminal and cable glands.
2.2.2 Terminal-connected twin-head pump
Fig. 2 Terminal-connected twin-head pump
The box contains the following items:
• MAGNA1-pump
•gaskets
• quick guide
• safety instructions
• two boxes with terminal and cable glands.
2.3 Lifting the pump
Always lift directly on the pump head or the cooling fins when
handling the pump. See fig. 3.
For large pumps, it may be necessary to use lifting equipment.
Position the lifting straps as illustrated in fig. 3.
Fig. 3 Correct lifting of pump
Fig. 4 Incorrect lifting of pump
Pumps tested with water containing anticorrosive
additives are taped on the inlet and outlet ports to
prevent residual test water from leaking into the
packaging. Remove the tape before installing the
pump.
TM06 7223 3016TM06 6741 3016
Observe local regulations concerning limits for
manual lifting or handling.
TM05 5819 3016
Do not lift the pump head by the control box, i.e. the
red area of the pump. See fig. 4.
TM06 7219 3016

English (GB)
5
3. Installing the product
3.1 Location
The pump is designed for indoor installation.
3.2 Tools
Fig. 5 Recommended tools
3.3 Mechanical installation
Install the pump so that it is not stressed by the pipes. For
maximum permissible forces and moments from pipe connections
acting on the pump flanges, see page 533.
You can suspend the pump directly in the pipes, provided that the
pipes support the pump.
Twin-head pumps are prepared for installation on a mounting
bracket or base plate.
To ensure adequate cooling of motor and electronics, observe the
following requirements:
• Position the pump in such a way that sufficient cooling is
ensured.
• The ambient temperature must not exceed 40 °C.
TM05 6472 4712
Pos. Tool Size
1 Screwdriver, straight slot 0.6 x 3.5 mm
2 Screwdriver, straight slot 1.2 x 8.0 mm
3 Screwdriver, torx bit TX10
4 Screwdriver, torx bit TX20
5 Hexagon key 5.0 mm
6 Side cutter
7 Open-end spanner Depending on DN size
8 Pipe wrench Only used for pumps with
unions
0.6 x 3.5
5.0
1.2 x 8.0
TX20
TX10
1
2
3
4
5
6
7
Step Action Illustration
1
Arrows on the pump housing
indicate the liquid flow direction
through the pump. The liquid flow
direction can be horizontal or
vertical, depending on the
control-box position.
TM05 5513 3812
2
Close the isolating valves and
make sure that the system is not
pressurised during installation of
the pump.
TM06 8040 0317
3Mount the pump with gaskets in
the pipes.
TM05 5515 3812
4
Flanged version:
Fit the bolts, washers and nuts.
Use the correct size of bolts
according to system pressure.
For further information about
torques, see page 533.
TM05 5516 3816TM05 5517 3812

English (GB)
6
3.3.1 Pump positions
Always install the pump with horizontal motor shaft.
• Pump installed correctly in a vertical pipe. See fig. 6, pos. A.
• Pump installed correctly in a horizontal pipe. See fig. 6, pos. B.
• Do not install the pump with vertical motor shaft. See fig. 6,
pos. C and D.
Fig. 6 Pump installed with horizontal motor shaft
3.3.2 Control box positions
To ensure adequate cooling, make sure that the control box is in
horizontal position with the Grundfos logo in vertical position. See
fig. 7.
Fig. 7 Pump with control box in horizontal position
Fig. 8 Automatic vent
3.3.3 Pump head position
If you remove the pump head before installing the pump in the
pipes, pay special attention when fitting the pump head to the
pump housing:
1. Visually check that the floating ring in the sealing system is
centred. See figs 9and 10.
2. Gently lower the pump head with rotor shaft and impeller into
the pump housing.
3. Make sure that the contact face of the pump housing and that
of the pump head are in contact before you tighten the clamp.
See fig. 11.
Fig. 9 Correctly centred sealing system
Fig. 10 Incorrectly centred sealing system
Fig. 11 Fitting the pump head to the pump housing
TM05 5518 3016TM05 5522 3016
Fit twin-head pumps installed in horizontal pipes with
an automatic air vent, Rp 1/4, in the upper part of the
pump housing. See fig. 8.
TM05 6062 3016
A B
C D
TM05 6650 3016TM05 6651 3016
Check the position of the clamp before you tighten it.
Incorrect position of the clamp will cause leakage
from the pump and damage the hydraulic parts in the
pump head. See fig. 11.
TM05 5837 3016

English (GB)
7
3.3.4 Changing the control box position
The warning symbol on the clamp holding the pump
head and pump housing together indicates that there
is a risk of personal injury. See specific warnings
below.
CAUTION
Pressurised system
Minor or moderate personal injury
- Pay special attention to any escaping vapour
when loosening the clamp.
CAUTION
Crushing of feet
Minor or moderate personal injury
- Do not drop the pump head when loosening the
clamp.
Fit and tighten the screw holding the clamp to 8 Nm ±
1 Nm. Do not apply more torque than specified even
though water is dripping from the clamp. The
condensed water is most likely coming from the drain
hole under the clamp.
Check the position of the clamp before you tighten
the clamp. Incorrect position of the clamp will cause
leakage from the pump and damage the hydraulic
parts in the pump head.
Step Action Illustration
1
Loosen the screw in the
clamp that holds the
pump head and pump
housing together.
If you loosen the screw
too much, the pump
head will be completely
disconnected from the
pump housing.
TM05 2867 3016
2
Carefully turn the pump
head to the desired
position.
If the pump head is
stuck, loosen it with a
light blow of a rubber
mallet.
TM05 5526 3016
3
Place the control box in
horizontal position so
that the Grundfos logo
is in vertical position.
The motor shaft must be
in horizontal position.
TM05 5527 3016
4
Due to the drain hole in
the stator housing,
position the gap of the
clamp as shown in step
4a or 4b.
TM05 2870 3016
8Nm!
5.0
4a
Single-head pump.
Position the clamp so
that the gap points
towards the arrow.
It can be in position 3, 6,
9 or 12 o'clock.
TM05 2918 3016
4b
Twin-head pump.
Position the clamps so
that the gaps point
towards the arrows.
They can be in position
3, 6, 9 or 12 o'clock.
TM05 2917 3016
5
Fit and tighten the screw
holding the clamp to 8 ±
1 Nm.
Do not retighten the
screw if condensed
water is dripping from
the clamp.
TM05 2872 3016
6
Fit the insulating shells.
The insulating shells for
pumps in
air-conditioning and
cooling systems must
be ordered separately.
TM05 5529 3016
Step Action Illustration
8 Nm5.0

English (GB)
8
As an alternative to insulating shells, you can insulate the pump
housing and pipes as illustrated in fig. 12.
Fig. 12 Insulation of pump housing and pipe
3.4 Electrical installation
Carry out the electrical connection and protection according to
local regulations.
Check that the supply voltage and frequency correspond to the
values stated on the nameplate.
• Make sure that the pump is connected to an external main
switch.
• The pump requires no external motor protection.
• The motor incorporates thermal protection against slow
overloading and blocking.
• When switched on via the power supply, the pump starts after
approximately 5 seconds.
3.4.1 Supply voltage
1 x 230 V ± 10 %, 50/60 Hz, PE.
The voltage tolerances are intended for mains-voltage variations.
Do not use the voltage tolerances for running pumps at other
voltages than those stated on the nameplate.
Do not insulate the control box or cover the control
panel.
TM05 5549 3016
WARNING
Electric shock
Death or serious personal injury
- Lock the main switch in position 0. Type and
requirements as specified in EN 60204-1, 5.3.2.
WARNING
Electric shock
Death or serious personal injury
- Connect the pump to an external main switch with
a minimum contact gap of 3 mm in all poles.
- Use earthing or neutralisation for protection
against indirect contact.
- If the pump is connected to an electric installation
where an electrical circuit breaker (voltage
sensing ELCB, residual-current device RCD or
residual-current circuit device RCCB) is used as
an additional protection, this circuit breaker must
be marked with the first or both of the symbols
shown below:

English (GB)
9
3.4.2 Connection diagrams
Fig. 13 Example of a mains-connected motor with main switch, backup fuse and additional protection
TM06 8503 0817
L
N
RCD/RCCB
L
N
C
NC
Relay outputDigital inputs
S/S
Fuse
External switch
Digital inputs
Relay outputs
Make sure that the fuse is dimensioned according to
the nameplate and local regulations.
Connect all cables in accordance with local
regulations.

English (GB)
10
3.4.3 Connection to the power supply
3.4.4 Connection to external control
Fig. 14 Wiring diagram
Step Action Illustration
1
Remove the front
cover from the
control box.
Do not remove the
screws from the
cover.
TM05 5530 3016
2
Locate the power
supply plug and
cable gland in the
small cardboard
box supplied with
the pump.
TM06 8049 0717
3
Connect the cable
gland to the
control box.
TM06 8050 0717
4
Pull the power
supply cable
through the cable
gland.
TM06 8051 0717
5
Strip the cable
conductors as
illustrated.
TM06 8052 0717
6
Connect the cable
conductors to the
power supply plug.
TM06 8053 0717
7
Insert the power
supply plug into
the male plug in
the control box.
TM06 8054 0717
1 x 230 V
7 mm
20 mm
7 mm
25 mm
Min. Ø 7 mm
Max. Ø 14 mm
8
Tighten the cable
gland.
Refit the front
cover.
TM06 8061 0717
TM06 8060 0717
WARNING
Electric shock
Minor or moderate personal injury
- Separate wires connected to supply terminals,
outputs NC, C and start-stop input from each other
and from the supply by means of reinforced
insulation.
Make sure that all cables are heat-resistant up to
75 °C.
Install all cables in accordance with EN 60204-1
and EN 50174-2:2000.
Connect all cables in accordance with local
regulations.
Step Action Illustration

English (GB)
11
3.4.5 Connecting the digital input 3.4.6 Connecting the fault relay output
Step Action Illustration
1
Remove the front
cover from the
control box.
Do not remove the
screws from the
cover.
TM05 5530 3016
2
Locate the digital
input terminal
connector.
TM06 8017 8517 0817
3
Pull the cable
through a cable
gland (M16) and
connect the cable
conductors to the
digital input
terminal
connector.
TM06 8516 0817
4
Refit the front
cover to the
control box.
TM06 8059 0717
Step Action Illustration
1
Remove the front
cover from the
control box.
Do not remove the
screws from the
cover.
TM05 5530 3016
2
Locate the fault
relay output cover
and remove it.
TM06 8056 0817
3
Pull the cable
through a cable
gland (M16) and
connect the cable
conductors to the
fault relay output
terminal
connector.
TM06 8057 0817
4Refit the fault
relay output cover.
TM06 8058 0717
5
Refit the front
cover to the
control box.
TM06 8059 0717

English (GB)
12
4. Starting up the product
4.1 Single-head pump
Do not start the pump until the system has been filled with liquid
and vented. Furthermore, the required minimum inlet pressure
must be available at the pump inlet. See section 10. Technical
data.
The pump is self-venting through the system, and the system
must be vented at the highest point.
4.2 Twin-head pump
The pumps are paired from factory. When switching on the power
supply the heads will establish connection, which is indicated by
a green light in the center of the Grundfos Eye. Please allow
approximately 5 seconds for this to happen.
If one of the pump heads is turned off, the pump with power will
show a yellow indicator light (warning 77, see section 8. Fault
finding the product). In that case, power up the switched off
pump. Once both pumps are on, the pumps will establish
connection and the warning deactivates.
See sections 7.8.1 Digital input (Start/Stop), 7.8.2 Fault relay
output and 7.8.3 Twin-head pump function for additional
twin-head pump setup options.
4.3 Connecting the pump to Grundfos GO
It is possible to connect all single and twin head pumps to
Grundfos GO via infrared communication (IR). In addition, twin
head pumps can be connected to Grundfos GO via radio.
Grundfos GO allows you to adjust the set point of the proportional
pressure curve (see section 7.1.1 Adjusting the proportional
pressure using Grundfos GO), read out alarm codes (see section
8.2 Fault finding) and manage the fault relay trigger setting (see
section 8.2.1 Fault finding, twin-head pump).
Grundfos GO is available as an accessory,
The number of starts and stops via the power supply
must not exceed four times per hour.
Step Action Illustration
1Switch on the power supply to the pump.
The pump starts after approximately 5 seconds.
TM05 5550 3016
2 Control panel at first startup.
TM05 5551 3016
3
The pump has been factory-set to the intermediate
proportional-pressure curve.
Select the control mode according to the system
application.
TM05 5551 3016
1 x 230 V± 10 %
∽50/60 Hz
0/
Of
f
1/On
Make sure that both pump heads are powered on.

English (GB)
13
5. Handling and storing the product
5.1 Storing the product
5.1.1 Frost protection
6. Product introduction
Grundfos MAGNA1 is a complete range of circulator pumps with
integrated controller enabling adjustment of pump performance to
the actual system requirements. In many systems, this reduces
the power consumption considerably, reduces noise from
thermostatic radiator valves and similar fittings and improves the
control of the system.
You can set the desired head on the control panel.
6.1 Applications
The pump is designed for circulating liquids in the following
systems:
• heating systems
• domestic hot-water systems
• air-conditioning and cooling systems.
You can also use the pump in the following systems:
• ground source heat pump systems
• solar heating systems.
6.2 Pumped liquids
The pump is suitable for thin, clean, non-aggressive and
non-explosive liquids, not containing solid particles or fibres that
may attack the pump mechanically or chemically.
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 pumps are also suitable for domestic hot-water systems.
We strongly recommend that you use stainless-steel pumps in
domestic hot-water applications to avoid corrosion.
In domestic hot-water systems, we recommend that you use the
pump only for water with a degree of hardness lower than
approximately 14 °dH.
In domestic hot-water systems, we recommend that you keep the
liquid temperature below 65 °C to eliminate the risk of lime
precipitation.
6.2.1 Glycol
You can use the pump for pumping water-ethylene-glycol
mixtures up to 50 %.
Example of a water-ethylene-glycol mixture:
Maximum viscosity: 50 cSt ~ 50 % water / 50 % glycol mixture at
-10 °C.
The pump has a power-limiting function that protects it against
overload.
The pumping of glycol mixtures affects the maximum curve and
reduces the performance, depending on the
water-ethylene-glycol mixture and the liquid temperature.
To prevent the glycol mixture from degrading, avoid temperatures
exceeding the rated liquid temperature and minimise the
operating time at high temperatures.
Clean and flush the system before you add the glycol mixture.
To prevent corrosion or lime precipitation, check and maintain the
glycol mixture regularly. If further dilution of the supplied glycol is
required, follow the glycol supplier's instructions.
Fig. 15 Pumped liquids
If the pump is not used during periods of frost, take
the necessary steps to prevent frost bursts.
Observe local regulation regarding pump-housing
material.
Do not pump aggressive liquids.
Do not pump flammable, combustible or explosive
liquids.
Additives with a density and/or kinematic viscosity
higher than those/that of water reduce the hydraulic
performance.
TM06 8055 0717
Max. 95 % RH
IPX4D

English (GB)
14
6.3 Identification
6.3.1 Nameplate
Fig. 16 Example of nameplate
* Example of production code: 1326. The pump was produced in
week 26, 2013.
Fig. 17 Production code on packaging
6.4 Insulating shells
Insulating shells are available for single-head pumps only.
Reduce the heat loss from the pump and pipes by insulating the
pump housing and the pipes. See fig. 18.
• Insulating shells for pumps in heating systems are supplied
with the pump.
• Insulating shells for pumps in air-conditioning and cooling
systems, down to -10 °C, are available as accessories and
must be ordered separately. See section 9.1 Insulating kits for
air-conditioning and cooling systems.
Insulating shells increase the pump dimensions.
Fig. 18 Insulating shells
Pumps for heating systems are factory-fitted with insulating
shells. Remove the insulating shells before you install the pump.
6.5 Non-return valve
If a non-return valve is fitted in the pipe system, ensure that the
set minimum outlet pressure of the pump is always higher than
the closing pressure of the valve. See fig. 19. This is especially
important in proportional-pressure control mode with reduced
head at a low flow rate.
Fig. 19 Non-return valve
TM05 5561 3812
Pos. Description
1 Product name
2 Model
3 Production code, PC, year and week*
4 Serial number
5 Product number
6 Country of manufacture
7 Enclosure class
8 Energy Efficiency Index, EEI
9 Part, according to EEI
10 Temperature class
11 Minimum current [A]
12 Maximum current [A]
13 Minimum power [W]
14 Maximum power [W]
15 Maximum system pressure
16 Voltage [V] and frequency [Hz]
17 QR code
18 CE mark and approvals
TM06 6692 2216
Limit the heat loss from the pump housing and
pipes.
TM05 5512 3016TM05 3055 0912

English (GB)
15
7. Control functions
Fig. 20 Selection of pump setting for system type
Factory setting: Intermediate proportional-pressure curve,
referred to as PP2.
7.1 Proportional-pressure curve (PP1, PP2 or PP3)
Proportional-pressure control adjusts the pump performance to
the actual flow rate demand in the system, but the pump
performance follows the selected performance curve, PP1, PP2
or PP3. See fig. 21 where PP2 has been selected. For further
information, see section 8. Fault finding the product.
Fig. 21 Three proportional-pressure curves/settings
The selection of the right proportional-pressure setting depends
on the characteristics of the system in question and the actual
flow rate demand.
7.1.1 Adjusting the proportional pressure using Grundfos GO
The set point of the proportional pressure curve can be adjusted
using Grundfos GO.
TM05 5554 3812TM05 5555 3812
Q
H
PP3
PP2
PP1
Q
H
This is only possible in proportional pressure mode,
not in other modes.
Step Action Illustration
1
Choose "Settings"
from the
dashboard.
TM06 8584 0817
2
Choose "Set
point" in the
Settings menu.
TM06 8583 0817

English (GB)
16
7.2 Constant-pressure curve (CP1, CP2 or CP3)
Constant-pressure control adjusts the pump performance to the
actual flow rate demand in the system, but the pump performance
follows the selected performance curve, CP1, CP2 or CP3. See
fig. 22 where CP1 has been selected. For further information, see
section 8. Fault finding the product.
Fig. 22 Three constant-pressure curves/settings
The selection of the right constant-pressure setting depends on
the characteristics of the system in question and the actual flow
rate demand.
7.3 Constant curve (I, II or III)
At constant-curve operation, the pump runs at a constant speed,
independent of the actual flow rate demand in the system. The
pump performance follows the selected performance curve, I, II
or III. See fig. 23 where II has been selected. For further
information, see section 8. Fault finding the product.
Fig. 23 Three constant-curve settings
The selection of the right constant-curve setting depends on the
characteristics of the system in question.
3
Use the arrows on
the top right of the
screen, or slide
the set point
indicator up and
down to adjust the
set point.
Press "OK".
TM06 8582 0817
4
When the pump
receives the set
point, the
proportional
pressure symbol
on the pump lights
up - none of the
level indicators
illuminate.
TM05 5554 3812
Step Action Illustration
TM05 5556 3812TM05 5557 3812
Q
H
CP3
CP2
CP1
Q
H

English (GB)
17
7.4 Overview of control functions
Fig. 24 Pump setting in relation to pump performance
TM05 2777 0512
Setting Pump curve Function
PP1 Lowest proportional-pressure
curve
The duty point of the pump will move up or down on the lowest proportional-pressure curve,
depending on the flow rate demand. See fig. 24.
The head is reduced at falling flow rate demand and increased at rising flow rate 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 flow rate demand. See fig. 24.
The head is reduced at falling flow rate demand and increased at rising flow rate 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 flow rate demand. See fig. 24.
The head is reduced at falling flow rate demand and increased at rising flow rate 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 flow rate demand in the system. See fig. 24.
The head is kept constant, irrespective of the flow rate 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 flow rate demand in the system. See fig. 24.
The head is kept constant, irrespective of the flow rate 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 flow rate demand in the system. See fig. 24.
The head is kept constant, irrespective of the flow rate demand.
III Speed III
The pump runs on a constant curve which means that it runs at a constant speed.
At speed III, the pump is set to run on the maximum curve under all operating conditions.
See fig. 24.
You obtain quick venting of the pump by setting the pump to speed III for a short period.
II Speed II
The pump runs on a constant curve which means that it runs at a constant speed.
At speed II, the pump is set to run on the intermediate curve under all operating conditions.
See fig. 24.
I Speed I
The pump runs on a constant curve which means that it runs at a constant speed.
At speed I, the pump is set to run on the minimum curve under all operating conditions. See
fig. 24.
III
II
I
H
PP3
CP3
CP2
PP1
CP1
PP2
Q

English (GB)
18
7.5 Selecting control function
System application Select this control mode
In systems with relatively large pressure losses in the distribution pipes and in air-conditioning and
cooling systems.
• Two-pipe heating systems with thermostatic valves and the following:
– very long distribution pipes
– strongly throttled pipe balancing valves
– differential-pressure regulators
– large pressure losses in those parts of the system through which the total quantity of water flows, for
example boiler, heat exchanger and distribution pipe up to the first branching.
• Primary circuit pumps in systems with large pressure losses in the primary circuit.
• Air-conditioning systems with the following:
– heat exchangers, fan coils
– cooling ceilings
– cooling surfaces.
Proportional pressure
In systems with relatively small pressure losses in the distribution pipes.
• Two-pipe heating systems with thermostatic valves and the following:
– dimensioned for natural circulation
– small pressure losses in those parts of the system through which the total quantity of water flows,
for example boiler, heat exchanger and distribution pipe up to the first branching or modified to a
high differential temperature between flow pipe and return pipe, for example district heating.
• Underfloor heating systems with thermostatic valves.
• One-pipe heating systems with thermostatic valves or pipe balancing valves.
• Primary circuit pumps in systems with small pressure losses in the primary circuit.
Constant pressure
You can also set the pump to operate according to the maximum or minimum curve, like an uncontrolled
pump:
• Use the maximum-curve mode in periods in which a maximum flow rate is required. This operating
mode is for instance suitable for hot-water priority in domestic hot-water systems.
• Use the minimum-curve mode in periods in which a minimum flow rate is required.
Constant curve
Q
H
Q
H
Q
H

English (GB)
19
7.6 Operating the product
Fig. 25 Control panel
7.6.1 Grundfos Eye
Grundfos Eye is on when you switch on the power supply. See
fig. 25, pos. 1.
Grundfos Eye is an indicator light providing information about the
actual pump status.
The indicator light flashes in different sequences and provides
information about the following:
• power on and off
• pump running or stopped
• pump alarms and warnings
• twin-head connection.
The function of Grundfos Eye is described in section
8.1 Grundfos Eye operating status.
Faults preventing the pump from operating properly, for example
a blocked rotor, are indicated by Grundfos Eye. See section
8.1 Grundfos Eye operating status.
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 may be generated to light up the
control panel even if the power supply has been switched off.
7.6.2 Light fields indicating the pump setting
The pump has nine performance settings which you can select
with the push-button. See fig. 25, pos. 3.
The pump setting is indicated by eight light fields in the display.
See fig. 25, pos. 2.
Fig. 26 Factory setting, PP2
CAUTION
Hot surface
Minor or moderate personal injury
- To avoid burns only touch the control panel.
TM05 5552 3812
Pos. Description
1Operating status of Grundfos Eye.
See section 7.6.1 Grundfos Eye.
2
Eight light fields indicating the pump setting.
See section 7.6.2 Light fields indicating the pump
setting.
3 Push-button for selection of pump setting.
1
2
3
TM05 5553 3812
Button
presses Active light fields Description
0
Intermediate
proportional-pressure
curve, referred to as PP2
1
Highest
proportional-pressure
curve, referred to as PP3
2
Lowest
constant-pressure curve,
referred to as CP1
3
Intermediate
constant-pressure curve,
referred to as CP2
4
Highest
constant-pressure curve,
referred to as CP3
5
Constant curve III
6
Constant curve II
7
Constant curve I
8
Lowest
proportional-pressure
curve, referred to as PP1

English (GB)
20
7.7 Pairing and unpairing twin-head pumps
The pumps are paired from factory, however, it can be useful to
know how to pair the system e.g. for service purposes.
The pumps can also be unpaired.
7.7.1 Pairing
7.7.2 Unpairing
The master pump head is the one from which you
initiate the pairing.
Step Action Illustration
1
Push and hold the
button on the
pump you wish to
assign as master
for 5 seconds.
The Grundfos Eye
on both pumps will
begin to flash.
TM06 8524 1017
2
Push the button
on the slave
pump.
TM06 8525 1017
3
Both Grundfos
Eyes are alight
and constant.
The two pumps
are now paired.
TM06 8527 1017
5 sec.
Step Action Illustration
1
Push and hold the
button on any of
the two pump
heads for 5
seconds.
TM06 8521 1017
2
The light in the
center of the
Grundfos Eye will
disappear. The
system has been
de-activated.
TM06 8522 1017
5 sec.

English (GB)
21
7.8 Communication, control and monitoring
MAGNA1 enables external control and monitoring via the
Start/Stop input (see section 7.8.1 Digital input (Start/Stop) and
fault relay output (see section 7.8.2 Fault relay output) on both
single and twin-head pumps. In addition, the wireless
communication feature in twin-head pumps lets you use the pump
without an external controller (see section 7.8.3 Twin-head pump
function).
7.8.1 Digital input (Start/Stop)
To use the digital input, connect the control wires to terminals
Start/Stop (S/S) and frame ( ).
Digital input on twin-head pumps
The Start/Stop input operates on system level, meaning that if the
master pump head receives a stop signal, the system stops.
As a main rule the digital input is only effective on the master,
which is why it is important to know which pump is assigned as
master, see fig. 27.
Fig. 27 Identifying the master pump head on the nameplate
For redundancy purposes, the digital input can be used
concurrent on the slave pump head. However, as long as the
master is powered up, the input on the slave will be ignored. In
the event of power loss on the master, the digital input of the
slave will take over. When the master pump head is back on, the
master takes over and controls the slave.
7.8.2 Fault relay output
It is possible to use the relay output as part of a control strategy
or for monitoring. For example, if the pump experiences a fault,
the fault relay sends a signal to the controller, which will
subsequently trigger further events depending on your chosen
strategy. In order to use the fault relay output follow the
instructions in fig. 28.
The relay can be used for outputs up to 250 V and 2 A.
Factory settings of the relay:
The functions of the fault relay are as shown in the table:
Fig. 28 Fault relay output table
Fault relay output in twin-head pumps
The fault relay output on each pump head operates
independently, meaning that if a fault occurs in one of the pumps
its respective relay is triggered.
7.8.3 Twin-head pump function
The twin-head pump function is available on all twin-head pumps.
It allows you to use twin-head pumps without an external
controller, as the two pump heads communicate via wireless
connection.
Operating mode
The pumps are operating in alternating mode, meaning that only
one pump is running at a time. The two pumps change from one
pump to the other every 24 hours with a tolerance of ± 0,5 % per
day.
To control the twin-head pump via the digital Start/Stop input, see
section 7.8.1 Digital input (Start/Stop).
To monitor the twin-head pump via the fault relay output, see
section 3.4.6 Connecting the fault relay output.
If no external on/off switch is connected, maintain the
jumper between terminals Start/Stop (S/S) and frame
( ). This connection is the factory setting.
TM06 8041 0417
Contact symbol Function
S/S Start/Stop
Frame connection
Cable shield
Start/Stop
Normal duty
Stop
TM06 8063 0817
S/S
Q
H
S/S
Q
H
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P/N: XXXXXXXX
S/N: XXXXXXXX
PC: XXXX
Model: X
IP XXX TF XXX
Grundfos Holding A/S, DK - 8850 Bjerringbro, Denmark
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Made in Germany
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TM06 8041 0417
Contact symbol Function
NC Normally closed
C Common
Fault relay Alarm signal
Not activated:
• The power supply has been switched off.
• The pump has not registered a fault.
Activated:
• The pump has registered a fault or there is a
wirebreak.
12
NC C
12
NC C