Grundfos SCALA1 User manual

SCALA1
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

SCALA1
English (GB)
Installation and operating instructions ..................................4
Português (PT)
Instruções de instalação e funcionamento ..............................40
Declaration of conformity ........................................76
3
Table of contents

English (GB) Installation and operating instructions
Original installation and operating instructions
Table of contents
1. General information ............. 4
1.1 Hazard statements .............. 5
1.2 Notes ..................... 5
1.3 Target group.................. 5
2. Product introduction ............ 5
2.1 Product description of SCALA 1 ....... 5
2.2 Intended use ................. 5
2.3 Pumped liquids ................ 5
2.4 Identification.................. 6
3. Receiving the product............ 7
3.1 Inspecting the product ............ 7
3.2 Scope of delivery ............... 7
4. Installation requirements .......... 7
4.1 Location .................... 7
4.2 Maximum system pressure .......... 7
5. Mechanical installation ........... 7
5.1 Positioning and mounting the product .... 8
5.2 Connecting the pipe system ......... 8
5.3 Installation examples .............11
6. Electrical connection ............13
6.1 Connecting products with a plug .......13
6.2 Connecting products without a plug .....13
6.3 Motor protection................14
7. Starting up the product ...........14
7.1 Priming the product ..............14
7.2 Starting up the pump .............14
7.3 Operation ...................14
7.4 Shaft seal run-in................14
8. Control functions ..............15
8.1 Operating panel ................15
8.2 Auto reset ...................16
8.3 Dry-running protection ............16
8.4 Anti-cycling ..................16
8.5 Maximum runtime ...............17
9. Setting the product .............17
9.1 Initial setup with Grundfos Go Remote....17
9.2 Expert settings ................17
9.3 Resetting to factory settings .........21
10. SCALA1 twin booster configuration....21
10.1 Operation modes and parameters ......21
10.2 Setting SCALA1 twin booster system ....21
11. Service ....................23
11.1 Maintenance .................23
11.2 Customer service information ........24
11.3 Service kits ..................24
12. Starting up after standstill .........24
12.1 Deblocking the pump .............25
13. Taking the product out of operation ....25
14. Storage ....................26
15. Fault finding .................26
15.1 Grundfos Eye SCALA1 ............26
15.2 The pump does not start ...........28
15.3 The pump is not running ...........28
15.4 The pump is running .............29
15.5 The pump cuts out during operation .....30
15.6 The pump performance is insufficient ....31
15.7 The pump starts and stops too frequently ..31
15.8 The pump does not stop ...........32
15.9 The pump gives electric shocks .......32
15.10 Twin booster system fault finding.......32
15.11 Fault resetting.................33
16. Technical data ................34
16.1 Operating conditions .............34
16.2 Mechanical data................34
16.3 Electrical data .................35
16.4 Dimensions and weights ...........35
16.5 Air handling mode performance curves . ..37
17. Approvals ..................38
17.1 Bluetooth technology information.......38
17.2 Radiofrequency radiation exposure .....38
18. Disposing of the product ..........39
18.1 Disposing of hazardous or toxic materials ..39
1. General information
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.
Read this document before you install the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
4
English (GB)

1.1 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
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.
The hazard statements are structured in the following
way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
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.
1.3 Target group
These installation and operating instructions are
intended for professional as well as non-professional
users.
2. Product introduction
2.1 Product description of SCALA 1
8
7
6
5
1
2
3
49
10
TM075026
Pos. Description
1 Lifting handle
2 Operating panel
3 Nameplate
4 Plug for access to pump shaft
5 Priming plug
6 Outlet connection
7 Inlet connection
8 Drain plug
9 External input connection
10 Twin connection
2.2 Intended use
Only use the product according to the
specifications stated in these installation
and operating instructions.
The product is suitable for pressure boosting of clean
water in domestic water-supply systems.
2.3 Pumped liquids
DANGER
Explosion risk
Death or serious personal injury
‐Do not use the product for flammable
liquids such as diesel oil, petrol or
similar liquids. The product must only
be used for water.
5
English (GB)

WARNING
Electric shock
Death or serious personal injury
‐Do not use the product for aggressive
liquids. The product must only be used
for water.
WARNING
Toxic material
Death or serious personal injury
‐Do not use the product for toxic liquids.
The product must only be used for
water.
If the water contains sand, gravel or other
debris, there is a risk of pump blockage
and pump damage. Install a filter on the
inlet side or apply a floating strainer to
protect the pump.
The product is suitable for pumping clean, thin, non-
aggressive and non-explosive liquids without solid
particles or fibres.
The product is designed for fresh water with a
maximum chloride content of 300 ppm and a free
chlorine content below 1 ppm.
Examples of liquids:
• drinking water
• rainwater.
2.4 Identification
2.4.1 Nameplate for SCALA1
DK-8850 Bjerringbro Denmark
SCALA1 3-35
PN 99530404
Model A
1x230 V 50Hz
SN 00001
PC 19 36
Hmax
Hnom
Made in Hungary
Qnom
T.amb.max
Tliq.max/Psyst.max:
IP X4D
P1(W)I(A)
750
1,50,01Min.
Max. 3,3
45°C/0.8Mpa
35 m
20 m
3 m
3
/h
55 °C
1
2
3
4
5
6
7
8
9
10
11
12
17
16
13
14
15
TM075340
Example of nameplate
Pos. Description
1 Type designation
2 Product number
3 Serial number
4Production code (year
and week)
5 Max. head
6 Nominal head
7 Nominal flow rate
8Max. ambient
temperature
9 Enclosure class
10 Max. operating pressure
11 Max. liquid temperature
12 Minimum and maximum
rated power
13 Model
14 Voltage and frequency
15 Approvals
16 Product QR code
17 Minimum and maximum
rated current
6
English (GB)

2.4.2 Type key for SCALA1
Example:
SCALA1 . 5- . 25 . 1x230V . 50 Hz . SCHUKO
Description
SCALA1 Type range
3
5Max. flow rate [m3/h]
25
35
45
55
Max. head [m]
1x230V
1x115V Voltage [V]
50 Hz
60 Hz Frequency [Hz]
SCHUKO (Type E/F)
No plug
Thailand (Type O)
Australia (Type I)
UK (Type G)
US (Type NEMA 5-15, NEMA
6-15)
Argentina (Type I)
Plug type
3. Receiving the product
3.1 Inspecting the product
On receipt of the product, do the following:
1. Check that the product is as ordered.
If the product is not as ordered, contact the
supplier.
2. Make sure that the supply voltage and frequency
correspond to the values stated on the product
nameplate.
3.2 Scope of delivery
The box contains the following items:
• 1 Grundfos SCALA1 pump
• 1 quick guide
• 1 safety instructions booklet.
4. Installation requirements
4.1 Location
The product can be installed both indoors and
outdoors.
Please observe the following:
• Install the product to enable easy inspection,
maintenance, and service.
• We recommend that you place the product as
close as possible to the liquid to be pumped.
• We recommend that you install the product near
a drain or in a drip tray connected to a drain in
order to lead away possible condensation from
cold surfaces.
4.1.1 Installation of the product in a frosty
environment
Protect the product from freezing if it is to be installed
outdoors where frost may occur.
4.1.2 Minimum space
The pump requires a minimum space of 495 x 225 x
340 mm (19.5 x 8.9 x 13.4 inches).
Even though the pump does not require much space,
we recommend that you leave enough space for
service and maintenance access.
4.2 Maximum system pressure
Make sure that the system in which the
pump is installed is designed for the
maximum pump pressure
The maximum inlet pressure depends on the head at
the actual duty point. The sum of the inlet pressure
and the head must not exceed the maximum system
pressure.
We recommend installing a pressure-relief valve to
protect the pump so that the outlet pressure does not
exceed the maximum system pressure.
5. Mechanical installation
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product. Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Electric shock
Death or serious personal injury
‐Mount the product horizontally to avoid
condensation in the electrical insulation
inside the control box.
WARNING
Chemical hazard
Death or serious personal injury
‐Before the pump is used for supplying
drinking water, flush the pump
thoroughly with clean water.
7
English (GB)

WARNING
Biological hazard
Death or serious personal injury
‐Before the pump is used for supplying
drinking water, flush the pump
thoroughly with clean water.
5.1 Positioning and mounting the product
Always place the product in a horizontal
position. A higher inclination can cause
electric shock due to condensation in the
electrical insulation inside the control box.
1. Place the product in a horizontal position with a
maximum inclination angle of ± 5 °. The base
plate must face downwards.
2. Fasten the product to a solid horizontal
foundation by means of screws through the holes
in the base plate.
TM075005
Horizontal foundation
A
C
B
TM075004
Base plate
[mm (in)]
A 135 (5.3)
B 163 (6.4)
C 174 (6.9)
5.2 Connecting the pipe system
Make sure that the pump is not stressed
by the pipe system.
Always loosen and tighten the union nuts
on the inlet and outlet ports by hand.
Damage to the inlet and outlet parts
increases the risk of leakage.
We recommend that you install isolating
valves on the inlet and outlet side of the
pump.
1. Turn the union nuts by hand to loosen the inlet
and outlet ports.
2. Seal the pipe fittings with thread sealing tape.
3. Carefully screw the inlet and outlet connections
onto pipe fittings using a pipe wrench or a similar
tool. Keep the union nut on the pipe fitting if you
have removed it from the pump. The pump is
equipped with flexible connections, ± 5 °, to
facilitate the connection of inlet and outlet pipes.
4. Fasten the connections to the inlet and outlet
ports by holding the connection with one hand
and tightening the union nut with the other hand.
8
English (GB)

1
2
3
TM075341
Inlet pipe with a gradual upward slope towards the
pump
Example:
Pos. Description
1 Inlet and outlet port
2 Union nut
3 Pipe fitting
5.2.1 Inlet and outlet pipes
Follow these general precautions when connecting
the inlet and outlet pipes.
Do not let the pump support the pipes. Use
pipe hangers or other supports at proper
intervals to provide pipe support near the
pump.
The internal diameter of the pipes must
never be smaller than the diameter of the
pump ports.
• Install the pipes so that air pockets are avoided,
especially on the inlet side of the pump.
• Use eccentric reducers with the tapered side
down.
• Make sure the pipes are as straight as possible
to avoid unnecessary bends and fittings. We
recommend long-radius 90 ° pipe bends to
decrease friction loss.
• Run the inlet pipe as direct as possible and,
ideally, make sure that the length is at least ten
times the pipe diameter.
• If possible, run a horizontal inlet line. We
recommend a gradual upward slope for pumps
operating in suction-lift conditions.
• A short pipe must be of the same diameter as the
inlet port or larger.
• A long pipe must be one or two sizes larger than
the inlet port, depending on the length.
TM040338
Recommended pipe installation to avoid friction and
air pockets
TM075387
Correct pipe sizing for connection to the pump inlet
or outlet
5.2.2 Maximum tapping point
We recommend that you install the unit so that the
height between the unit and the highest tapping point
does not exceed the values shown in the table
below.
H
TM075383
Maximum tapping point
9
English (GB)

Model Maximum height [m]
3-25 10
3-35 15
3-45 20
5-25 10
5-55 25
In case the highest tapping point is higher than the
values in this table, the external input may be used.
10
English (GB)

5.3 Installation examples
We recommend that you follow the installation
examples.
Valves are not supplied with the pump.
5.3.1 Suction from a well
6
54
23
1
H2 H1
TM075006
Pos. Description
1 Highest tapping point
2 Isolating valve
3 Flexible hoses
4 Pipe support
5 Inlet filter
6 Foot valve with strainer
H1 Maximum suction lift: 8 m
H2 Inlet pipe must be submerged at least 0.5 m
5.3.2 Suction from a tank
A
1
2
34
6
7
8
5
TM075007
Pos. Description
1 Highest tapping point
2 Pipe hangers
3 Isolating valve
4 Flexible hoses
5 Drain to sewer
6 Inlet filter
7 Freshwater tank
8 Foot valve with strainer
9 Minimum 1-degree inclination
11
English (GB)

5.3.3 Mains water pressure boosting
In some countries, boosting from the city
water mains is prohibited. Please follow
local regulations regarding this application.
49
1
37
2
5
10
62
3
8
TM075262
Pos. Description
1 Highest tapping point
2 Pipe hangers and supports
3 Isolating valves
4 Flexible hoses
5 Bypass valve
6
Optional pressure-reducing valve on the inlet
side if the pressure can exceed 8 bar (115
psi).
7
Optional pressure relief valve on the outlet
side if the installation cannot withstand the
outlet pressure.
8
Drip tray. Install the pump on a small stand to
prevent the ventilation holes from being
flooded.
9 Pressure gauge
10 Mains water pipe
5.3.4 Inlet pipe length
The overview below shows the different possible inlet
pipe lengths, depending on the vertical pipe length.
The overview is only intended as a guide.
H
L
Inlet pipe length
DN 32 DN 40
H
[m (ft)]
L
[m (ft)]
H
[m (ft)]
L
[m (ft)]
0 (0) 68 (223) 0 (0) 207 (679)
3 (10) 43 (141) 3 (10) 129 (423)
6 (20) 17 (56) 6 (20) 52 (171)
7 (23) 9 (30) 7 (23) 26 (85)
8 (26) 0 (0) 8 (26) 0 (0)
Pre-conditions:
Maximum flow velocity: 1 l/s (16 gpm).
Inside roughness of pipes: 0.01 mm (0.0004 in).
Size Inside pipe diameter
[mm (in)]
Pressure loss
[mm (psi/ft)]
DN 32 28 (1.1) 0.117 (5/100)
DN 40 35.2 (1.4) 0.0387 (1.6/100)
12
English (GB)

6. Electrical connection
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product. Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Electric shock
Death or serious personal injury
‐The protective earth (PE) of the power
outlet must be connected to the
protective earth of the pump. The plug
must have the same PE connection
system as the power outlet.
‐
All electrical connections must be carried
out by qualified persons in accordance
with local regulations.
If the power cable is damaged, it must be
replaced by the manufacturer, the
manufacturer's service partner or a
similarly qualified person.
Make sure that the electrical installation
supports the rated current [A] of the
product. See the nameplate of this
product.
6.1 Connecting products with a plug
WARNING
Electric shock
Death or serious personal injury
‐Make sure that the power plug
delivered with the product is in
compliance with local regulations.
‐The plug must have the same
protective earth (PE) connection
system as the power outlet. If not, use
a suitable adapter if allowed by local
regulations.
Do not turn on the power supply until the
pump has been filled with liquid.
1. Switch off the power supply to the power socket.
2. Connect the plug to the power socket.
6.2 Connecting products without a plug
WARNING
Electric shock
Death or serious personal injury
‐Power cables without a plug must be
connected to a supply disconnecting
device incorporated in the fixed wiring
according to the local wiring rules.
‐The protective earth (PE) of the power
outlet must be connected to the
protective earth of the pump. The plug
must have the same PE connection
system as the power outlet.
Do not turn on the power supply until the
pump has been filled with liquid.
If the product is delivered with a cable but without a
plug, connect the cable to the external main switch or
attach a plug.
Connecting the cable to an external main switch
1. Strip the cable.
2. Thread each individual wire to the correct
terminal in the external main switch.
Wiring a plug
1. Strip the cable.
2. Loosen the two screws holding the cable clamp
and pull the cable through.
3. Thread each individual wire to the correct
terminal.
4. Tighten the terminal screws and the cable clamp
screw. Make sure not to overtighten the cable
clamp screw.
1
23
4
TM072505
Example, plug wiring
Pos. Description
1 PE: Earth, yellow and green wire
2 N: Neutral, blue wire
3 L: Live, brown wire
4 Cable clamp
13
English (GB)

6.3 Motor protection
The pump incorporates current- and temperature-
dependent motor protection. If the pump is blocked or
otherwise overloaded, the built-in thermal switch will
cut out. When the motor has cooled sufficiently, it will
restart automatically.
No external motor protection is required.
7. Starting up the product
Do not turn on the power supply until the
pump has been filled with liquid.
7.1 Priming the product
1. Unscrew the priming plug and pour at least 1.7
litres (0.45 gallons) of water into the pump
housing.
2. Screw the priming plug on again.
Example:
TM075342
Priming the pump
If the suction depth exceeds 6 m (20 ft), it
may be necessary to prime the pump more
than once.
Always tighten priming and drain plugs by
hand.
7.2 Starting up the pump
After installing and priming, follow the following steps
to start up the pump.
1. Prime the pump according to the priming
instructions.
2. Open all isolating valves.
3. Open the tapping point that is the highest or
furthest away from the pump to let out air trapped
in the system.
4. Turn on the pump's power supply. All the
symbols on the operating panel will light up
briefly. The Stop icon remains on.
5. Press the Start/Stop button to start the pump. If
there is a suction lift, it may take up to five
minutes before the pump delivers water
depending on the length and diameter of the inlet
pipe.
6. When the water flows through the tapping point
without air, close the tapping point. The pump will
stop after approx. 10 seconds.
7. The startup is now completed, and the pump is
ready for operation.
7.3 Operation
7.3.1 Normal operation
When water is consumed in the water supply system,
the pump starts if the starting conditions of the pump
are fulfilled. This happens, for example, when a tap is
opened, making the pressure in the system drop.
The pump stops when the consumption stops, i.e.
when the tap is closed.
7.3.1.1 Starting and stopping conditions
Starting conditions
The pump starts when at least one of the following
conditions is fulfilled:
• The flow is higher than Qmin (1.5 l/min).
• The pressure is lower than pstart.
Stopping conditions
The pump stops with a time delay of 10 seconds
when both of the following conditions are fulfilled:
• The flow is lower than Qmin (1.5 l/min).
• The pressure is higher than pstart.
The pstart values are shown in Technical data.
7.4 Shaft seal run-in
The shaft seal faces are lubricated by the pumped
liquid. A slight leakage from the shaft seal of up to 10
ml per day or 8 to 10 drops per hour may occur.
Under normal conditions, the leaking liquid will
evaporate. As a result, no leakage will be detected.
When the pump is started for the first time, or when
the shaft seal has been replaced, a certain run-in
period is required before the leakage is reduced to an
acceptable level. The time required for this depends
on the operating conditions, that is, every time the
operating conditions change, a new run-in period will
be started.
14
English (GB)

Leaking liquid will drain through the drain holes in the
motor flange.
Install the product in such a way that leakage cannot
cause undesirable collateral damage.
8. Control functions
8.1 Operating panel
SCALA1
Stop
TM075407
Symbol Description
Grundfos Eye: The indicator light
shows the operating status of the
product.
Start/Stop:Press the button to make
the product ready for operation or to
start and stop the product.Start:If you
press the button when the product is
stopped, the product starts if no other
functions with higher priority have been
enabled. Stop:If you press the button
when the product is running, the
product always stops.
Pump is stopped. The stop icon will
light up on the display.
Bluetooth connect button enables
communication with Grundfos GO
Remote. Connection indicator light. It
will light up when the connection to
Grundfos GO Remote is established.
Reset the alarms.
Symbol Description
The following alarm lights indicate an issue with
installation:
Leakage in the system.
Dry-running or water shortage.
The maximum runtime has been
exceeded.
15
English (GB)

8.2 Auto reset
This function allows the pump to automatically check
if the operating conditions are back to normal. If the
operating conditions are back to normal, the alarm
indication will be reset automatically.
The factory setting is: ON
The auto reset function works as follows:
Alarm Auto reset action Configurable Default
Dry run
The pump will attempt eight restarts at five-minute
intervals. If not successful, this cycle will be repeated
after 24 hours.
In twin configuration Duty/Assist, there is no reset if
only one pump is in dry run alarm. If both pumps are in
dry run, the reset will be staggered.
In twin configuration Duty/Standby, the pump will
attempt to restart immediately independent of the
second pump.
YES ON
Anti-cycling This function will attempt to reset after 12 hours, and
the pump will return to normal operation. YES ON
Max. runtime None Fixed disabled
Missed twin
pump
Auto reset is performed by the system when
communication is reestablished. Fixed enabled
8.3 Dry-running protection
If a dry-running alarm has been activated,
the cause should be identified before the
pump is restarted to prevent damage to
the pump.
The unit incorporates dry-running protection that
automatically stops the pump in case of dry-running.
The dry-running protection functions differently during
priming and operation.
8.3.1 Dry-running during priming
If the unit does not detect pressure and flow within 5
minutes after it has been connected to a power
supply, and the pump has started, the dry-running
alarm is activated.
8.3.2 Dry-running during operation
If the unit does not detect pressure and flow within 40
seconds during normal operation, the dry-running
alarm is activated.
8.3.3 Resetting of dry-running alarm
If the dry-running alarm has been activated, the pump
can be restarted manually by pressing [Reset]. If the
unit does not detect pressure and flow within 40
seconds after restarting, the dry-running alarm is
reactivated.
This protection is always ON.
Dry-running or water shortage.
8.4 Anti-cycling
If there is a minor leakage in the system, or a tap has
not been closed entirely, the unit will start and stop
the pump periodically. To avoid cycling, the anti-
cycling function of the unit will stop the pump and
indicate an alarm. The anti-cycling function can be
configurated in Grundfos GO Remote.
Off
If the pump starts 40 times in a fixed pattern, a LED
icon will signalize cycling. The pump will remain in
normal operation.
On
If the pump starts and stops in a fixed pattern, there is
a leakage in the system, and the pump will stop and
show red Grundfos Eye and LED icon indication.
The factory setting for this function is OFF.
Leakage in the system.
16
English (GB)

8.5 Maximum runtime
This function is a timer that can turn off the pump if it
runs continuously for a certain amount of time. This
time period can be adjusted via Grundfos GO
Remote.
Off
The pump will run depending on the operating
conditions disregarding the continuous operation.
On
The pump will stop after the specified period of
continuous operation, and it will show the
alarm Maximum runtime exceeded. This alarm will
always need to be reset manually.
The factory setting for this function is OFF.
Maximum runtime exceeded.
9. Setting the product
9.1 Initial setup with Grundfos Go Remote
9.1.1 Startup wizard on Grundfos GO Remote
The product is designed for Bluetooth communication
with Grundfos GO Remote.
Once you have connected your product to Grundfos
GO Remote, a startup wizard appears. Follow the
instructions to make your settings.
Grundfos GO Remote enables you to set functions
and gives you access to status overviews, technical
product information and current operating
parameters.
9.1.2 Connecting to Grundfos GO Remote
Before connecting the product to Grundfos GO
Remote, the Grundfos GO Remote app must be
downloaded to your smartphone or tablet. The app is
free of charge and available for iOS and Android
devices.
1. Open Grundfos GO Remote on your device.
Make sure that Bluetooth is enabled.
Your device must be within reach of the product
to establish Bluetooth connection.
2. Press the Bluetooth CONNECT button on
Grundfos GO Remote.
3. Press the connect button on the operating panel.
The blue LED above the connect button is
flashing until your device is connected. Once the
connection is established, the LED will be
permanently on.
Grundfos GO Remote is now loading the data for
the product.
9.2 Expert settings
Grundfos GO Remote allows you to enable additional
conditions for pump operation.
9.2.1 External input
This pump allows connecting external input as an
additional condition to the pump operation.
External input may be beneficial in the following
situations:
• level switch in roof tank filling to stop the pump
when the tank is full
• inlet pressure switch to stop the pump in case of
raised inlet pressure
• moisture detection switch in irrigation
applications to run the pump only when the
ground is dry.
External input must be 24 V digital input and can be
connected through the opening on the pump body.
The cable length is limited to 30 m.
External input can only be set up with
Grundfos GO Remote.
9.2.1.1 Setting up external input
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product. Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Electric shock
Death or serious personal injury
‐The protective earth (PE) of the power
outlet must be connected to the
protective earth of the pump. The plug
must have the same PE connection
system as the power outlet.
‐
All electrical connections must be carried
out by qualified persons in accordance
with local regulations.
If the power cable is damaged, it must be
replaced by the manufacturer, the
manufacturer's service partner or a
similarly qualified person.
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English (GB)

Make sure that the electrical installation
supports the rated current [A] of the
product. See the nameplate of this
product.
12
3
4
TM075384
Connecting external input
Pos. Description
1 Lid on PCB cover
2 Terminals
3 Cable clip
4 Cable gland
1. Remove the screws and lift the pump cover.
2. Open the lid on the PCB cover.
3. Pull the cable through the gland and the clip.
4. Connect to the terminals.
5. Fix the clip to hold cable in place.
6. Close the lid.
7. Return the pump cover and screw it in place.
8. Power on the pump and connect with Grundfos
GO Remote.
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English (GB)

9.2.1.2 Roof tank filling
In the installation below, the level switch is used to
signal the pump to run when the water level in the
tank drops.
The example below shows the float switch in the input
closed position. In this case, the pump should not run,
and Grundfos GO Remote settings indicate that the
input is closed.
If you exceed the maximum tapping point of the
pump, the external input should run on input only.
1
5
2
3
4
TM075330
Pos. Description
1 Float switch
2 External input (switch) cable
3 Pump
4 Water source (tank)
5 Roof tank
9.2.2 Calendar function
The operation of SCALA1 can be scheduled in the
calendar function of the Grundfos GO Remote app.
This function determines when the pump is allowed to
run and when not. It is particularly beneficial for
irrigation and agriculture purposes, where the pump
should be active only within a certain period of time.
9.2.2.1 Enabling calendar function
To enable this function, go to Grundfos GO Remote
app and follow these steps:
1. Connect to the pump.
2. Go to Scheduling.
3. Press Save schedule.
The pump will now run on demand, but only within the
time period set in the calendar function.
When the pump has been stopped by the
calendar function, it will be indicated on
the HMI by a steady yellow Grundfos Eye.
9.2.3 Performance modes
Different performance modes can be selected for
SCALA1. Selecting the correct mode is dependent on
the installation.
There are 3 performance modes for SCALA1:
• self-priming
• air handling
• positive inlet.
The default mode is self-priming, which will be the
desired mode for most installations.
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English (GB)

Performance
mode Description Benefits
Self-priming
The self-priming
valve is fully
opened.
Best
performance
and lowest
noise level in
suction
applications.
Air handling1
When there is
air in the
installations, it
can accumulate
in the
hydraulics.
Partially closing
the self-priming
valve can
provide
assistance.
Improves the
pump's
capability to
handle air in the
water.
Positive inlet
If the installation
has a positive
inlet pressure,
the pump is
always primed,
and the self-
priming valve
can be fully
closed.
Removes sound
associated with
self-priming
valve movement
in installations
with positive
inlet pressure.
1This performance mode will result in some performance loss
and a slight increase in noise level. Please refer to technical
data for more information.
9.2.3.1 Selecting the performance mode
If the performance mode needs to be changed from
the default setting, follow these steps:
1. Remove the pump cover.
a. Unscrew and remove the priming plug from
the pump.
b. Loosen and remove the inlet and outlet
connections from the pump.
c. Loosen and pull away the pump cover to
remove it from the pump.
TM075488
Remove the pump cover
2. Locate the performance mode knob.
3. Using a size 10 hex key, turn the knob to the
desired selection.
Self-priming
Air handing
Positive inlet
TM075489
Rotate knob to select performance mode.
4. Return the pump cover and reconnect the
priming plug and connections.
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English (GB)