Nibe S2125 User manual

NIBE S2125 is an intelligent, inverter-controlled
air/water pump. With NIBE indoor modules, it forms
a very efficient climate system for your home. NIBE
S2125 provides optimised savings as it automatically
adapts to your home’s output requirements all year
around.
The NIBE S2125 has an optimised seasonal perform-
ance factor*, which results in low operating costs
and high-performance hot water. The working area
gives a supply temperature of up to 75°C. At an
outdoor temperature down towards –25°C, it still
delivers up to 65°C, while the noise level stays low.
Available in two power sizes, 8 and 12.
Together with the NIBE S-series indoor module with
built-in wifi connection and the possibility of wireless
accessories, the S-series is a natural part of your
connected home. Smart technology adjusts the in-
door climate automatically while you’re in complete
control from your phone or tablet. Giving high com-
fort and low energy consumption, while doing nature
a favour at the same time.
• Optimised seasonal performance factor* and low
operating costs.
• Working range up to 75°C supply temperature and
65°C at an outdoor temperature of –25°C.
• New design for low noise level.
*The NIBE S2125 has a rating of SCOP of 5.0 (Average climate,
35/55 °C) and SCOP of >4.1 (Cold climate, 35/55 °C) in accordance
with European standard EN 14825:2018, i.e. the standard for de-
termining the reference seasonal effect level, SCOP. Applies to
S2125 -8 and -12.
IT'S IN OUR NATURE NIBE.EU
Air/water heat pump
NIBE S2125

Installation method
S2125 – a part of your climate system where S2125 is
intended to be combined with one of the indoor modules
VVM or the control modules SMO.
Together with an indoor module, S2125 creates a com-
plete heating/cooling and hot water unit. Our flexible
indoor modules provide efficient heating and high hot
water performance. VVM indoor modules are complete
with a smart and user-friendly control system, hot water
heater, additional heat, self-regulating circulation pump,
etc.
The control modules, SMO, offer a flexible system
solution that can be easily customised. For systems
with SMO, different components such as water heaters,
additional heat and other accessories can be selected
to suit the installation’s requirements.
There is a wide range of system solutions and accessor-
ies for NIBE's indoor modules and control modules.
2 NIBE S2125
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This is how NIBE S2125 works

COMPATIBLE INDOOR MODULES (VVM) AND CONTROL MODULES (SMO)
SMO S40VVM S320
XXS2125-8
XXS2125-12
NIBE S2125 3
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INDOOR MODULES
UN
VVM S320
Stainless steel, 3x230 V
Part no. 069 201
VVM S320
Stainless steel, 1x230 V
Part no. 069 198
VVM S320
Stainless steel, 3x400 V
Part no. 069 196
VVM S320
Enamel, 3x400 V
Part no. 069 206
VVM S320
Copper, 3x400 V
Part no. 069 195
4 NIBE S2125
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.6°
°
UN
NIBE S2125 5
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CONTROL MODULES
SMO S40
Control module
Part no. 067 654

Principle of operation
Principle of operation with hot water and a heating sys-
tem.
The heating medium side and the domestic hot water
side must be fitted with the necessary safety equipment
in accordance with the applicable regulations.
SYMBOL KEY
MeaningSymbol
Shut-off valve
Tapping valve
Non-return valve
Circulation pump
Expansion vessel
Filterball
Pressure gauge
Safety valve
Trim valve
Reversing valve/shunt
Control module
Air/water heat pump
Radiator system
Domestic hot water
Water heater
EXPLANATION
Connection, heating medium out of S2125XL1
Connection, heating medium in to S2125,XL2
-EB101-QM40
-EB101-QZ2
-EB101-QM1
-EB101-FL10
XL1
XL2
6 NIBE S2125
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Transport
S2125 must be transported and stored vertically.
Ensure that the heat pump cannot fall over during
transport.
Check that the heat pump has not been damaged during
transport.
Installation and
positioning
• Place the heat pump in a suitable location outdoors
to prevent any risk of the refrigerant flowing in through
ventilation openings, doors or similar openings in the
event of a leak. It must also not constitute a hazard
to people or property in any other way.
• If the heat pump is placed in a location where any re-
frigerant leak could accumulate, for example below
ground level (in a dip or low-lying recess), the installa-
tion must satisfy the same requirements that apply
for gas detection and the ventilation of engineering
rooms. Requirements regarding sources of ignition
must be applied where appropriate.
• Place S2125 outdoors on a solid level base that can
take the weight, preferably a concrete foundation. If
concrete slabs are used they must rest on asphalt or
shingle.
• The lower edge of the evaporator must not be lower
than the level of the average local snow depth. The
base should be at least 70 mm tall.
•S2125 should not be positioned next to noise-sensitive
walls, for example, next to a bedroom.
• Also ensure that the placement does not inconveni-
ence the neighbours.
• S2125 must not be placed so that recirculation of the
outdoor air is possible. Recirculation entails reduced
power and impaired efficiency.
• The evaporator must be sheltered from direct wind / ,
which negatively affects the defrosting function. Place
S2125 protected from wind / against the evaporator.
•Small amounts of condensation water, as well as melt
water from defrosting, may be produced. Condensa-
tion water must be led off to a drain or equivalent.
• Care must be exercised so that the heat pump is not
scratched during installation.
LEK
S2125
LEK
S2125
LEK
S2125
min 300 mm
min
70 mm
Do not place S2125 directly on the lawn or other non
solid surface.
If there is a risk of snow slip from roof, a protective roof
or cover must be erected to protect the heat pump,
pipes and wiring.
NIBE S2125 7
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Good to know about
NIBE S2125

LIFT FROM THE STREET TO THE SET UP
LOCATION
If the base allows, the simplest thing is to use a pallet
truck to move the S2125 to the set up location.
The centre of gravity is offset to one side (see print on
the packaging).
LEK
C:a 180 kg
Approx. 180 kg
If S2125 needs to be transported across soft ground,
such as a lawn, we recommend using a crane truck that
can lift it to the installation location. When S2125 is lifted
with a crane, the packaging must be untouched.
If a crane vehicle cannot be used the S2125 can be
transported on an extended sack truck. S2125 must be
taken from its heaviest side and two people are required
to lift S2125.
LIFT FROM THE PALLET TO FINAL
POSITIONING
Before lifting remove the packaging and the securing
strap to the pallet.
Place lifting straps around each machine foot. Lifting
from the pallet to the base requires four persons, one
for each lifting strap.
Supplied components
Local differences in the enclosed kit may occur. See
relevant installer manual for more information.
1 x automatic gas separat-
or
2 x flexible pipes (DN25,
G1") with 4 x gaskets
1 x non-return valve
8 NIBE S2125
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Installation area
The distance between S2125 and the house wall must
be at least 350 mm, but not more than 500 mm in loca-
tions that are exposed to the wind. The free space above
S2125 must be at least 1,000 mm. The free space in
front must be at least 1,000 mm for any future servicing.
350 mm
Fritt utrymme bakom
Fritt utrymme framför
dock 1000 mm för ev. framtida service
Min. avstånd
vid användning
av flera F2300
600 mm
1000 mm
400 mm
Minimalt
fritt utrymme
600mm
Minimalt
fritt utrymme
Minimum free
space Minimum free space
Minimum distance during use
of several S2125
600 mm
600 mm
At least 1,000
mm
400 mm
Free space in front for any future servicing
350 – 500 mm Free space behind*
* The space behind must not exceed 500 mm in locations that are
exposed to the wind.
NIBE S2125 9
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Inspection of the
installation
Current regulations require the heating installation to be
inspected before it is commissioned. The inspection
must be carried out by a suitably qualified person and
should be documented. The above applies to closed
heating systems.
If the heat pump is replaced, the installation must be
inspected again.
Condensation water
trough
The condensate drain pan collects and leads away the
condensation water.
It is important for the heat pump’s function that the
condensation water is led away and that the outlet for
the condensation water pipe is positioned so as to pre-
vent damage to the building. Condensation run-off
should be checked regularly, especially during the au-
tumn. Clean if necessary.
Pipe with heating cable for draining the condensate drip
tray is not included. To ensure the function, the access-
ory KVR 11 should be used.
• The condensation water (up to 50 litres/24 hrs) that
collects in the trough should be routed away by a pipe
to an appropriate drain, it is recommended that the
shortest outdoor stretch possible is used.
• The section of the pipe that can be affected by frost
must be heated by the heating cable to prevent
freezing.
Pipe with heating cable for draining the condensation
water trough is not included.
To ensure the function, the accessory KVR 11 should
be used.
• Route the pipe downward from S2125.
• The outlet of the condensation water pipe must be at
a depth that is frost free or alternatively indoors (with
reservation for local ordinances and regulations).
• Use a water trap for installations where air circulation
may occur in the condensation water pipe.
• The insulation must seal against the bottom of the
condensation water trough.
10 NIBE S2125
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Installation

DRAINAGE OF CONDENSATION
Stone caisson
LEK
Frostfritt djup
S2125
Frost proof depth
If the house has a cellar the stone caisson must be po-
sitioned so that condensation water does not affect the
house. Otherwise the stone caisson can be positioned
directly under the heat pump.
Drain indoors
Water seal
The condensation water is lead to an indoor drain (sub-
ject to local rules and regulations).
When routing pipes indoors, condensation water pipes
must be insulated against condensation.
Route the pipe downward from S2125.
The condensation water pipe must have a water seal to
prevent air circulation in the pipe.
Pipe routing indoors is not included.
Gutter drainage
LEK
S2125
Frostfritt
djup
Frost free
depth
Water seal
Route the pipe downward from S2125.
The condensation water pipe must have a water seal to
prevent air circulation in the pipe.
If none of the recommended alternatives is used good
lead off of condensation water must be assured.
NIBE S2125 11
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Pipe connections
Pipe installation must be carried out in accordance with
current norms and directives.
The pipe dimension should not be less than the recom-
mended pipe diameter according to the table. However,
each system must be dimensioned individually to man-
age the recommended system flows.
MINIMUM SYSTEM FLOWS
The installation must be dimensioned at least to manage
the minimum defrosting flow at 100% pump operation,
see table.
Minimum re-
commended
pipe dimen-
sion (mm)
Minimum re-
commended
pipe dimen-
sion (DN)
Minimum
flow during
defrosting
(100% pump
speed (l/s)
Air/water
heat pump
28250.32
S2125-8
(1x230V)
S2125-8
(3x400V)
S2125-12
(1x230V)
S2125-12
(3x400V)
An undersized system can result in damage to the
product and lead to malfunctions.
S2125 can only operate up to a return temperature of
about 65 °C and an outgoing temperature of about 75 °C
from the heat pump.
S2125 is not equipped with external shut off valves on
the water side; these must be installed to facilitate any
future servicing. The return temperature is limited by
the return line sensor.
WATER VOLUMES
Depending on the size of your S2125, an available water
volume is required to prevent short operating times and
to enable defrosting. For the optimum operation of
S2125, a minimum available water volume of 10 litres
multiplied by the size number is recommended. E.g.
S2125-12: 10 litres x 12 = 120 litres. This applies indi-
vidually to heating and cooling systems.
PIPE COUPLING, HEATING MEDIUM
You can find a list of compatible products in the section
“Compatible indoor modules (VVM) and control modules
(SMO)”.
There is a difference between connection to a control
module compared with connection to an indoor module.
See also the Installer Manual for your control module/in-
door module.
The heat pump must be vented by the upper connection
(XL1) using the venting nipple on the enclosed flexible
hose.
Install as follows:
• safety valves
• drain valve and shut-off valves
For emptying the heat pump during prolonged power
failures.
• non-return valve
• charge pump
• expansion vessel
• pressure gauge
• filterball or particle filter
Installed before the inlet, i.e. the lower connection
(XL2) on the heat pump.
• reversing valve.
When connecting to the control module, and if the
system is to be able to work with both the climate
system and the hot water heater.
• trim valve
When connecting to control module and hot water
heater.
The heat pump must be vented by the upper connection
(XL1) using the venting nipple on the enclosed flexible
hose.
P
XL1
XL2
The image shows connection to the control module.
12 NIBE S2125
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Charge pump
The charge pump (not included in the product) is
powered and controlled from the indoor module/control
module. It has a built-in frost protection function and,
for this reason, must not be switched off when there is
a risk of freezing.
At temperatures below +2 °C the charge pump runs
periodically, to prevent the water from freezing in the
charge circuit. The function also protects against excess
temperatures in the charge circuit.
Pressure drop, condenser
Pressure drop
(kPa)
Flow
(l/s)
0
1
2
3
4
5
6
0 0,1 0,2 0,3 0,4 0,5 0,6
Tryckfall
[kPa]
Flöde [l/s]
Tryckfall S2125
Pipe insulation
UN
All outdoor pipes must be insulated with at least 19 mm
thick pipe insulation.
Installation alternative
S2125 can be connected in several ways. The necessary
safety equipment must be installed in accordance with
current regulations for all installation options.
See nibe.eu for more detailed installation options.
Electrical connections
• Electrical installation and wiring must be carried out
in accordance with national provisions.
• Disconnect S2125 before insulation testing the house
wiring.
• If a miniature circuit breaker is used, this must have
at least triggering characteristic "C". See section
"Technical specifications" in the Installer Manual for
S2125.
• If the building is equipped with an earth-fault breaker,
S2125 should be equipped with a separate one.
• S2125 must be installed via an isolator switch. The
cable area has to be dimensioned based on the fuse
rating used.
The RCD should have a nominal tripping current of no
more than 30 mA. The incoming supply must be 400V
3N~ 50Hz via an electrical distribution unit with fuses.
For 230V~ 50Hz, the incoming supply must be 230V~
50Hz via distribution box with fuses.
• The routing of cables for heavy current and signals
should be made out through the cable glands on the
heat pump's right-hand side, seen from the front.
• The communication cable must be a screened cable
with three conductors.
• Connect the charge pump to the control module. See
where the charge pump is to be connected in the In-
staller Manual for your control module.
NIBE S2125 13
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When your heat pump is located outdoors some external
maintenance is required.
Insufficient maintenance can cause serious damage to
S2125, which is not covered by the guarantee.
Checking grilles and
bottom panel on
S2125
Check that the inlet grille is not clogged by leaves, snow
or anything else regularly throughout the year.
You should be vigilant during windy conditions and/or
in the event of snow as the grilles can become blocked.
Also check that drain holes in the bottom panel are free
from dirt and leaves.
Regularly check that condensation is routed away cor-
rectly through the condensation pipe. Ask your installer
for assistance if required.
KEEP FREE OF SNOW AND ICE
S2125 S2125
S2125S2125
LEK
LEK
LEK
LEK
Prevent snow from building up and covering the grilles and drain holes
on S2125.
S2125 S2125
S2125S2125
LEK
LEK
LEK
LEK
Keep free of snow and/or ice.
14 NIBE S2125
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Maintenance

Cleaning the outer
casing
If necessary the outer casing can be cleaned using a
damp cloth.
Care must be exercised so that the heat pump is not
scratched when cleaning. Avoid spraying water into the
grilles or the sides so that water penetrates into S2125.
Prevent S2125 coming into contact with alkaline cleaning
agents.
NIBE S2125 15
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When connection to NIBE indoor module / control
module (VVM / SMO) is ready, you can control your unit
via the indoor module / control module.
Control, general
The indoor temperature depends on several different
factors. Sunlight and heat emissions from people and
household machines are normally sufficient to keep the
house warm during the warm seasons. When it gets
colder outside, the climate system needs to help heat
the house. The colder it is outside, the warmer radiators
and underfloor heating systems have to be.
Control of the heat production is performed based on
the "floating condensing" principle, which means that
the temperature level needed for heating at a specific
outdoor temperature is produced based on collected
values from the outdoor and supply temperature
sensors. The room sensor can also be used to com-
pensate the deviation in room temperature.
Heat production
The supply temperature of the heat pump will
oscillate around the theoretically required value.
The supply of heating/cooling to the house is
regulated in accordance with the selected heating curve
setting (or cooling curve). After adjustment, the correct
amount of heat for the current outdoor temperature is
supplied. The heat pump’s supply temperature will os-
cillate around the theoretically required value.
OWN CURVE
The indoor module/control module have pre-pro-
grammed, non-linear heating curves. It is also possible
to create your own defined curve. This is a partially linear
curve with a number of break points. You select break
points and the associated temperatures.
Hot water production
Hot water charging starts when the temperat-
ure has fallen to the set start temperature. Hot
water charging stops when the hot water
temperature at the hot water sensor has been reached.
For temporary higher hot water demand, there is a
function called “More hot water”.
For temporary higher hot water demand, there is a
function that allows the temperature to be raised tem-
porarily for up to 12 hours or by a one time increase
(can be selected in the menu system).
It is also possible to put the installation in holiday mode,
which means that the lowest possible temperature is
maintained without the risk of freezing.
Additional heat only
ADDITIONAL HEAT ONLY
The indoor module (VVM), which is connected to S2125,
can be used with the additional heat alone (electric
boiler) to produce heating and hot water, for example
before the outdoor module is installed.
Alarm indications
If there is an alarm, the status lamp lights red
on the control module’s / indoor module’s dis-
play. Detailed information, depending on the
fault, is shown in the display. An alarm log is created
with each alarm, containing a number of temperatures,
times and operating status.
16 NIBE S2125
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Functions

The display
The indoor module (VVM) / control module
(SMO) is controlled using a clear and easy to
use display.
Instructions, settings and operational information are
shown on the display. You can easily navigate between
the different menus and options to set the comfort or
obtain the information you require.
The display unit is equipped with a USB socket that can
be used to update the software and save logged inform-
ation in the indoor module / control module.
If you connect the product to the network, you can up-
grade the software without using the USB port. See
section "myUplink".
If you connect the indoor module/control module to the
network, you can upgrade the software without using
the USB port. See section "myUplink".
Visit myuplink.com and click the "Software" tab to
download the latest software for your installation.
myUplink
With myUplink you can control the installation
– where and when you want. In the event of
any malfunction, you receive an alarm directly
to your e-mail or a push notification to the myUplink app,
which allows you to take prompt action.
Visit myuplink.com for more information.
SPECIFICATION
You need the following in order for myUplink to be able
to communicate with your system:
• wireless network or network cable
• Internet connection
• account on myuplink.com
We recommend our mobile apps for myUplink.
RANGE OF SERVICES
myUplink gives you access to various levels of service.
The base level is included and, apart from this, you can
choose two premium services for a fixed annual fee (the
fee varies depending on the functions selected).
MOBILE APPS FOR MYUPLINK
The mobile apps can be downloaded free of charge from
where you usually download your mobile apps. Logging
into the mobile app is performed using the same account
details as on myuplink.com.
NIBE SMART PRICE ADAPTION™
Smart Price Adaption is not available in all
countries. Contact your NIBE dealer for more
information.
Smart Price Adaption adjusts the heat pump's consump-
tion according to the time of day that electricity prices
are lowest. This allows for savings, provided that the
hourly rate subscription has been signed with the elec-
tricity supplier.
The function is based on hourly rates for the coming day
being downloaded via myUplink. To use the function,
an Internet connection and account on myUplink are
necessary.
SMART HOME
When you have a smart home system that can commu-
nicate with myUplink, you can control the installation
via an app by activating the "smart home" function.
By allowing connected units to communicate with my-
Uplink, your heating system becomes a natural part of
your homesmart home and gives you the opportunity
to optimise the operation.
Remember that the “smart home” function requires
myUplink in order to work.
NIBE SMART ENERGY SOURCE™
Smart Energy Source™ prioritises how / to
what extent each docked energy source will
be used. Here you can choose if the system is
to use the energy source that is cheapest at the time.
You can also choose if the system is to use the energy
source that is most carbon neutral at the time.
NIBE S2125 17
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Working range,
heating
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45
Framledningstemperatur
(°C)
Utomhustemperatur
(°C)
Framledningstemperatur
Returledningstemperatur
Supply temperature
(°C)
Supply temperature
Return temp
Outdoor temperature
(°C)
Working range,
cooling
5
10 20 30 40 35 45
25
15
10
15
20
25
30
35
Framledningstemperatur
(°C)
Utomhustemperatur
(°C)
Returledningstemperatur
Framledningstemperatur
Supply temperature
(°C)
Return temp
Supply temperature
Outdoor temperature
(°C)
During shorter time it is allowed to have lower working
temperatures on the water side, e.g. during start up.
Power during heating
operation
Maximum and minimum capacity during continuous
operation. Defrosting is not included.
S2125-8
1
0
2
3
4
5
6
7
8
-30 -20 -10 0 10 20 30 40 50
S2125-8 Maximal och mininimal uppvärmningseffekt
Framledningstemperatur 35 °C
Framledningstemperatur 45 °C
Framledningstemperatur 55 °C
Utomhustemperatur
(°C)
Uppvärmningseffekt
(kW)
Tyst läge, framledningstemperatur 35 °C
Tyst läge, framledningstemperatur 55 °C
Heating output
(kW)
Outdoor temperature
(°C)
Flow line temperature 35 °C
Flow line temperature 45 °C
Flow line temperature 55 °C
Silent mode, supply temperature 35°C
Silent mode, supply temperature 55°C
S2125-12
1
0
2
3
4
5
6
7
8
9
11
10
-30 -20 -10 0 10 20 30 40 50
S215-12 Maximal och minimal uppvärmningseffekt
Framledningstemperatur 35 °C
Framledningstemperatur 45 °C
Framledningstemperatur 55 °C
Utomhustemperatur
(°C)
Uppvärmningseffekt
(kW)
Tyst läge, framledningstemperatur 35 °C
Tyst läge, framledningstemperatur 55 °C
Heating output
(kW)
Outdoor temperature
(°C)
Flow line temperature 35 °C
Flow line temperature 45 °C
Flow line temperature 55 °C
Silent mode, supply temperature 35°C
Silent mode, supply temperature 55°C
18 NIBE S2125
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Technical data

Power during cooling
operation
Maximum and minimum capacity during continuous
operation.
S2125-8, -12
0,0
10,0
12,0
8,0
6,0
4,0
2,0
15 20 25 30 35 40 45
Utomhustemperatur
( C)
S2125 Maximal och mininimal kyleffekt
Kyleffekt
(kW)
Framledningstemperatur 18 C
Framledningstemperatur 7 C
Cooling output
(kW)
Supply temperature 18°C
Supply temperature 7°C
Outdoor temperature
(°C)
NIBE S2125 19
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Dimensions
S2125
1128
1054220 40
52
Ø52 57
118
80
471
37 - 67 1043
745
68 62 556
96
621
Ø40
122
174
S2125
1128
1054220 40
52
Ø52 57
118
80
471
37 - 67 1043
745
68 62 556
96
621
Ø40
122
174
20 NIBE S2125
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