Nibe S1156 User guide

Installer manual
Ground source heat pump
NIBE S1156 1x230V
IHB EN 2326-2
631656

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Setting the indoor temperature.
13.45 3 October
Climate system 1
Offset
Heating
Smartguide
Hi!
Your system is working properly. Do you want help making
changes?
Yes please, take me to Smartguide.
October13.45 3
Here, you can set the temperature in the installation's zones.Smartguide helps you both to view information about the current
status and to make the most common settings easily. The inform-
ation that you see depends on the product you have and the ac-
cessories that are connected to the product.
Product overview
Company AB
Phone number
S1156
01234567890123
1.0.0
Product
overview
Product name
Serial number
Software
Service
October13.45 3
Update
Increasing hot water temperature
13.45 3 October
More hot water
Hot water
Here, you can find information about product name, the product's
serial number, the version of the software and service. When there
is new software to download, you can do it here (provided that
S1156 is connected to myUplink).
Here, you can start or stop a temporary increase in the hot water
temperature.
This function page is only visible in installations with a water
heater.

41 Important information
4Safety information
4Symbols
4Marking
4Serial number
5Country specific information
6Inspection of the installation
72 Delivery and handling
7Transport
7Assembly
8Supplied components
8Handling panels
113 The heat pump design
11General
12Distribution boxes
12Cooling module
144 Pipe connections
14General
16Dimensions and pipe connections
16Brine side
17Climate system
17Cold and hot water
18Installation alternative
215 Electrical connections
21General
23Connections
28Settings
306 Commissioning and adjusting
30Preparations
30Filling and venting
31Start-up and inspection
34Setting the heating curve
377 myUplink
37Specification
37Connection
37Range of services
388 Control - Introduction
38Display unit
39Navigation
39Menu types
41Climate systems and zones
429 Control - Menus
42Menu 1 - Indoor climate
45Menu 2 - Hot water
47Menu 3 - Info
48Menu 4 - My system
52Menu 5 - Connection
53Menu 6 - Scheduling
54Menu 7 - Installer settings
6210 Service
62Maintenance
62Service actions
6811 Disturbances in comfort
68Info-menu
68Manage alarm
68Troubleshooting
7012 Accessories
7213 Technical data
72Dimensions
73Electrical data
74Technical specifications
77Energy labelling
81Item register
3Table of ContentsNIBE S1156
Table of Contents

Safety information
This manual describes installation and service procedures
for implementation by specialists.
The manual must be left with the customer.
For the latest version of the product’s documentation, see
nibe.co.uk.
NOTE
Also read the enclosed Safety Manual before
starting the installation.
Symbols
Explanation of symbols that may be present in this manual.
NOTE
This symbol indicates danger to person or machine.
Caution
This symbol indicates important information about
what you should consider when installing or servi-
cing the installation.
TIP
This symbol indicates tips on how to facilitate us-
ing the product.
Marking
Explanation of symbols that may be present on the product’s
label(s).
Dangerous voltage.
Read the User Manual.
Read the Installer Manual.
Disconnect the voltage supply before starting work.
Serial number
The serial number can be found at the bottom right on S1156,
in the display on the home screen "Product overview" and
on the type plate (PZ1).
Caution
You need the product's (14 digit) serial number for
servicing and support.
NIBE S1156Chapter 1 | Important information4
Important information

Country specific information
UNITED KINGDOM
This installation is subject to building regulation approval,
notify the local Authority of intention to install.
Use only manufacturer’s recommended replacement parts.
For more information see nibe.co.uk.
Benchmark places responsibilities on both manufacturers
and installers. The purpose is to ensure that customers are
provided with the correct equipment for their needs, that it
is installed, commissioned and serviced in accordance with
the manufacturers instructions by competent persons and
that it meets the requirements of the appropriate Building
Regulations. The Benchmark Checklist can be used to
demonstrate compliance with Building Regulations and
should be provided to the customer for future reference.
Installers are required to carry out the installation, commis-
sioning and servicing work in accordance with the Bench-
mark Code of practice which is available from the Heating
and Hotwater Industry Council who manage and promote
the Scheme. Visit centralheating.co.uk for information.
Warranty and insurance information
Thank you for installing a new NIBE heat pump in your home.
NIBE heat pumps are manufactured in Sweden to the very
highest standard so we are pleased to offer our customers
a comprehensive guarantee.
The product is guaranteed for 24 months for parts and la-
bour from the date of installation or 33 months from the
date of manufacture, whichever is the shorter.
The NIBE guarantee is based on the unit being installed and
commissioned by a NIBE accredited installer, serviced every
year and the Benchmark documents completed. Where this
condition is not met, any chargeable spare parts or compon-
ents issued within the applicable guarantee period still be-
nefit from a 12 month warranty from the date of issue by
the manufacturer.
We recommend the installer completes and returns as soon
as possible, your guarantee registration card or completes
the guarantee form on the NIBE website, www.nibe.co.uk
Electrical Supply
The heat pump must be permanently connected to a 230 V
~ 50 Hz supply.
All system components shall be of an approved type and all
wiring to current I.E.E wiring regulations.
External wiring must be correctly earthed, polarised and in
accordance with the relevant standards: Currently this is
BS 7671.
Domestic Hot Water
All domestic hot water circuits, connections and fittings
must be in accordance with the relevant standards and
water supply regulations. It should also be in accordance
with the relevant requirements of the Local Authority and
the Building Regulations relevant to the location of installa-
tion.
BS 8558:2015 Services supplying water for domestic use
within buildings and their cartilages.
Water Supply (Water Fitting) Regulations 1999 or The Water
Bylaws 2000 (Scotland).
Heating System
The installation of the heat pump should follow best practice
as covered in the following:
BS 5449 Forced circulation hot water central heating sys-
tems for domestic premises.
BS 15450 Heating systems in buildings – Design of heat
pump heating systems.
5Chapter 1 | Important informationNIBE S1156

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. In addition, fill in the page for the installation data in the User Manual.
DateSignatureNotesDescription
✔
Brine side
System flushed
System vented
Antifreeze
Level/Expansion vessel
Filterball (particle filter)
Safety valve
Shut off valves
Circulation pump setting
Climate system
System flushed
System vented
Expansion vessel
Filterball (particle filter)
Safety valve
Shut off valves
Circulation pump setting
Electricity
Connections
Main voltage
Phase voltage
Fuses heat pump
Fuses property
Outside sensor
Room sensor
Safety breaker
Earth circuit-breaker
Set emergency mode in menu 7.1.8.2
Miscellaneous
Warranty
Benchmark checklist
NIBE S1156Chapter 1 | Important information6

Transport
S1156 should be transported and stored vertically in a dry
place. When being moved into a building, S1156 may be leant
back 45 °.
Ensure that S1156 has not been damaged during transport.
Caution
The product can be tail heavy.
If the cooling module is pulled out and transported upright,
S1156 can be transported on its back.
Remove the outer panels in order to protect them when
moving in confined spaces inside buildings.
R
0
R
0
EXTRACTING THE COOLING MODULE
To simplify transport and service, the heat pump can be
separated by pulling the cooling module out from the cabin-
et.
See page 64 for instructions about the separation.
Assembly
•Position S1156 on a solid foundation indoors that with-
stands water and the weight of the product.
•Use the product’s adjustable feet to attain a horizontal
and stable set-up.
30 - 50 mm
30 - 50 mm
15 - 40 mm
20-55 mm
•Since water comes from S1156, the area where S1156 is
located must be equipped with floor drainage.
•Install with its back to an outside wall, ideally in a room
where noise does not matter, in order to eliminate noise
problems. If this is not possible, avoid placing it against a
wall behind a bedroom or other room where noise may be
a problem.
•Wherever the unit is located, walls to sound sensitive
rooms should be fitted with sound insulation.
•Route pipes so they are not fixed to an internal wall that
backs on to a bedroom or living room.
INSTALLATION AREA
Leave a free space of 800 mm in front of the product. Ap-
prox. 50 mm free space is required on each side, to allow
the side panels to be removed (see image). All service on
S1156 can be carried out from the front, however the right-
hand panel may need to be removed. Leave free space
between the heat pump and the wall behind (and any routing
of supply cables and pipes), to reduce the risk of any vibra-
tions being propagated.
(50) (50)
800
*
*
* A normal installation needs 300 – 400 mm (any side) for
connection equipment, e.g. level vessel, valves and electrical
equipment.
7Chapter 2 | Delivery and handlingNIBE S1156
Delivery and handling

Supplied components
O-rings
8 x
Room
sensor(BT50)
1 x
Outdoor temperat-
ure sensor (BT1)
1 x
LEK
Aluminium tape
1 x
LEK
Level vessel (CM2)
1 x
Temperature
sensor
3 x
Filterball (QZ2)
8 kW
1 x G1
1 x G3/4
13 kW
1 x G1
1 x G1 1/4
LEK
Cold water shut-
off and expansion
relief valve,
water heater (FL1)
1 x
LEK
Insulation tape
1 x
Label for external
control voltage for
the control system
1 x
Compression ring
couplings
8 kW
2 x (ø28 x G25)
3 x (ø22 x G20)
13 kW
5 x (ø28 x G25)
LOCATION
The kit of supplied items is placed in packaging on top of
the heat pump.
Handling panels
OPEN FRONT HATCH
Press the hatch's top left corner to open it.
REMOVE THE FRONT
1. Remove the screw in the hole next to the on/off button
(SF1).
2. Pull the panel's top edge towards you and lift diagonally
upwards to remove it from the frame.
UN
NIBE S1156Chapter 2 | Delivery and handling8

ASSEMBLE THE FRONT
1. Hook one bottom corner of the front onto the frame.
2. Hook the other corner in place.
3. Check the display is straight. Adjust if necessary.
4. Press the top of the front section against the frame and
screw it into place.
REMOVE SIDE PANEL
The side panels can be removed to facilitate the installation.
1. Remove the screws from the upper and lower edges.
UN
2. Twist the panel slightly outwards.
UN
9Chapter 2 | Delivery and handlingNIBE S1156

3. Move the panel outwards and backwards.
UN
4. Assembly takes place in the reverse order.
NIBE S1156Chapter 2 | Delivery and handling10

General
UN
QN10
BT2
EB1
PZ1
EP14-QM34
EP14-QM31 EP14-QM32
EP14-QM33
PZ2
UB3
AA4
SF1
XL1
XL6
XL9
XL7
XL2
BF1
UB2
FC1
UB1
XF8
XF3
EP14
PIPE CONNECTIONS
Connection, heating medium flowXL1
Connection, heating medium returnXL2
Connection, brine inXL6
Connection, brine outXL7
Connection, hot water heaterXL9
HVAC COMPONENTS
Cooling moduleEP14
EP14-QM31 Shut-off valve, heating medium supply
EP14-QM32 Shut off valve, heating medium return
EP14-QM33 Shut-off valve, brine in
EP14-QM34 Shut off valve, brine out
Shuttle valve, climate system/water heaterQN10
SENSORS ETC.
Flow meterBF1
Temperature sensors, heating medium flowBT2
ELECTRICAL COMPONENTS
Display unitAA4
Immersion heaterEB1
Miniature circuit breakerFC1
On/off buttonSF1
USB socketXF3
Network connection for myUplinkXF8
MISCELLANEOUS
Rating platePZ1
Identification plate, cooling modulePZ2
Cable glandUB1
Cable glandUB2
Cable gland, rear side, sensorUB3
Designations according to standard EN 81346-2.
11Chapter 3 | The heat pump designNIBE S1156
The heat pump design

Distribution boxes
UN
-X29
-X28
0-5V 1
+5V 2
AUX1 3
AUX2 4
AUX3 5
AUX4 6
AUX5 7
AUX6 8
AUX7 9
AUX8 10
BT6 11
BT25 12
1
1
2
3
2
3
4
5
6
7
8
9
10
11
12
GND
+12V
B
A
OT+
OT−
0-5V
PWM0
PWM1
CPU
EXT COM
INT COM
ERROR
POWER
+5V
GND
BE1
BE2
BE3
K10
-X27
NO
O
NC
AUX-RELAY
BT50 13
BT1 14
-X30
FQ10-S2FQ10AA2
RF2
ELECTRICAL COMPONENTS
Base cardAA2
Temperature limiterFQ10
FQ10-S2 Reset button for temperature limiter
EMC filter1 RF2
1Only for S1156-13
Cooling module
8 kW
BT11
BT12
BT10
BT3
GP2
QM2 QM1
GP1
AA3
RF2
13 kW
UN
BT11
BT12
RA1
BT10
BT15
GP2
QM2
QM1
GP1
CA1
QA40
AA3
8 kW
EP2
CA1
RA1
BP1
BT14
QA40
BT15
GQ10
BP2
QN1
EB10
EP1
HS1
XL21
XL20
BT17
FQ14
BP9
BP8
BT84
13 kW
UN
BP9
EP2
GQ10
EP1
BT17
BP2
BT15
EB10
XL20
HS1
BT14
XL21
QN1
FQ14
BP1
BP8
BT3
BT84
PIPE CONNECTIONS
Service connection, high pressureXL20
Service connection, low pressureXL21
HVAC COMPONENTS
Circulation pumpGP1
Brine pumpGP2
Drainage, climate systemQM1
Draining, brine sideQM2
SENSORS ETC.
High pressure pressostatBP1
Low pressure pressostatBP2
Low pressure transmitterBP8
High pressure sensorBP9
Temperature sensors, heating medium returnBT3
Temperature sensor, brine inBT10
Temperature sensor, brine outBT11
Temperature sensor, condenser supply lineBT12
Temperature sensor, hot gasBT14
Temperature sensor, fluid pipeBT15
Temperature sensor, suction gasBT17
Temperature sensor, suction gas evaporatorBT84
NIBE S1156Chapter 3 | The heat pump design12

ELECTRICAL COMPONENTS
Input circuit boardAA3
CapacitorCA1
Compressor heaterEB10
Temperature limiter, compressorFQ14
InverterQA40
ChokeRA1
EMC-filterRF2
COOLING COMPONENTS
EvaporatorEP1
CondenserEP2
CompressorGQ10
Drying filterHS1
Expansion valveQN1
13Chapter 3 | The heat pump designNIBE S1156

General
Pipe installation must be carried out in accordance with
current norms and directives. S1156 can operate with a re-
turn temperature of up to 58 °C and an outgoing temperat-
ure from the heat pump of 70 (65 °C with only the com-
pressor).
S1156 is not equipped with external shut off valves; these
must be installed to facilitate any future servicing.
Caution
Ensure that incoming water is clean. When using
a private well, it may be necessary to supplement
with an extra water filter.
Caution
Any high points in the climate system, must be
equipped with air vents.
NOTE
The pipe systems have to be flushed clean before
the product is connected, to prevent any contam-
inants from damaging the components.
NOTE
Water may drip from the safety valve’s overflow
pipe. The overflow pipe must be routed to a suit-
able drain, to prevent hot water splashes from
causing harm. The overflow pipe must be inclined
along its entire length to prevent pockets where
water can accumulate, and must be frost-proof.
The overflow pipe must be at least the same size
as the safety valve. The overflow pipe must be
visible and its mouth must be open and not placed
close to electrical components.
NOTE
This installation is subject to building regulation
approval, notify the local Authority of intention to
install.
NOTE
Use only manufacturer’s recommended replace-
ment parts.
HARD WATER AREAS
Normally, there should not normally be any problem installing
S1156 in hard water areas, as the operating temperature is
50–60°C.
CLEANING THE CLIMATE SYSTEM
When the water heater and the climate system have been
filled with water, S1156 must operate at maximum normal
temperature for at least one hour. Thereafter the system
must be drained of water and refilled.
Before installing the heat pump in an existing system, it is
important that the system is properly flushed through.
Even if the heat pump is to be installed in a new system, the
heat pump and system should be flushed.
NOTE
Ensure that cleaning agent has been removed from
the entire system before adding inhibitor.
After flushing an inhibitor should be used for long-term anti-
corrosion protection.
NIBE Energy Systems Limited recommends water treat-
ments, supplied by Fernox, specifically designed for heat
pumps.
NIBE S1156Chapter 4 | Pipe connections14
Pipe connections

SYMBOL KEY
MeaningSymbol
Unit box
Shut-off valve
Non-return valve
Mixing valve
Circulation pump
Expansion vessel
Filterball
Fan
Shut off valve
Pressure gauge
Particle filter
Safety valve
Temperature sensor
Trim valve
Pressure reduction valve
Tundish
Reversing valve/shunt
Manual reversing valve/shunt
Heat exchanger
Overflow valve
Bore hole
Ground collector
Cooling system
Pool
Domestic hot water
Hot water circulation
Heat pump
Heating system
Heating system with lower temperature
SYSTEM DIAGRAM
S1156 consists of heat pump, immersion heater, circulation
pumps and control system. S1156 is connected to the brine
and heating medium circuits.
In the heat pump evaporator, the brine (water mixed with
anti-freeze, glycol or ethanol) releases its energy to the re-
frigerant, which is vaporised in order to be compressed in
the compressor. The refrigerant, of which the temperature
has now been raised, is passed to the condenser where it
gives off its energy to the heating medium circuit and, if
necessary, to any docked water heater. If there is a greater
need for heating/hot water than the compressor can provide
there is an integrated immersion heater.
XL
1 6 9 7 2
Connection, heating medium flowXL1
Connection, heating medium returnXL2
Connection, brine inXL6
Connection, brine outXL7
Connection, hot water heaterXL9
15Chapter 4 | Pipe connectionsNIBE S1156

Dimensions and pipe
connections
600
55
135
390
465
540
622
560
725* 725*
440
70
1500
20-50
25
600
55
135
390
465
540
622
25
560
725* 725*
440
70
1500
20-50
XL1 XL6 XL7XL9 XL2
PIPE DIMENSIONS
13 kW8 kWConnection
2822(mm)(XL1)/(XL2) Heating medium supply/re-
turn ext. Ø
2822(mm)(XL9) Connection water heater ext. Ø
28(mm)(XL6)/(XL7) Brine in/out ext. Ø
Brine side
COLLECTOR
Caution
The length of the collector hose varies depending
on the rock/soil conditions, climate zone and on
the climate system (radiators or underfloor heat-
ing) and the building’s power requirement. Each
installation must be sized individually. The brine
pump’s capacity must be taken into consideration
when sizing the collector.
In those cases where it is necessary to have several collect-
ors, these should be connected in parallel with the possibility
for adjusting the flow of the relevant coil.
For surface soil heat, the hose should be buried at a depth
determined by local conditions and the distance between
the hoses should be at least 1 metre.
For several bore holes, the distance between the holes must
be determined according to local conditions.
Ensure the collector hose rises constantly towards the heat
pump to avoid air pockets. If this is not possible, airvents
should be used.
Because the temperature of the brine system can fall below
0 °C, it must be protected against freezing down to -15 °C.
When making the volume calculation, use 1 litres of ready
mixed brine per metre of collector hose (applies when using
PEM-hose 40x2.4 PN 6.3) as a guide value.
Anti freeze must be mixed according to manufacturer's in-
structions to ensure frost protection and should be checked
using a refractometer.
NOTE
Ensure that cleaning agent has been removed from
the entire system before the anti-freeze is added.
NIBE Energy Systems Limited recommends water treatments
(supplied by e.g. Fernox and Sentinel) specifically designed
for heat pumps.
SIDE CONNECTION
It is possible to angle the brine connections, for connection
to the side instead of top connection.
To angle out a connection:
1. Disconnect the pipe at the top connection.
2. Angle the pipe in the desired direction.
3. If necessary, cut the pipe to the desired length.
* Can be angled for side connection.
NIBE S1156Chapter 4 | Pipe connections16

CONNECTING THE BRINE SIDE
Insulate all indoor brine pipes against condensation.
Mark the brine system with the antifreeze that is used.
Install as follows:
•enclosed level vessel (CM2)/expansion vessel
The level vessel must be installed as the highest point in
the brine system on the incoming pipe before the brine
pump (Alternative 1). If the level vessel cannot be placed
at the highest point, an expansion vessel must be used
(Alternative 2).
NOTE
Note that condensation may drip from the level
vessel. Position the vessel so that this does not
harm other equipment.
•pressure relief valve
Install the safety valve under the level vessel as illustrated.
•pressure gauge
The pressure gauge is only required if an expansion vessel
is used.
•shut-off valve
Install the shut-off valve as close to S1156 as possible.
•enclosed filterball (QZ2)
Install the filterball as close to S1156 as possible.
TIP
If filling connection KB25/KB32 is used, the en-
closed filterball does not need to be fitted.
•vent valve
When necessary you should install venting valves in the
brine system.
In the case of connection to an open groundwater system,
an intermediate frost-protected circuit must be provided,
because of the risk of dirt and freezing in the evaporator.
This requires an extra heat exchanger.
P
-QZ20
Alt. 1 Alt. 2
XL6
XL7
Climate system
A climate system is a system that regulates the indoor
temperature with the help of the control system in S1156
and, for example, radiators, underfloor heating, underfloor
cooling, fan coils, etc.
CONNECTING THE CLIMATE SYSTEM
Install as follows:
•expansion vessel
•pressure gauge
•pressure relief valve
Recommended opening pressure is 0.25 MPa (2.5 bar).
For information about max opening pressure, see technical
data. Install the safety valve as illustrated.
Install the safety valve as illustrated.
•enclosed filterball (QZ2)
Install the filterball as close to S1156 as possible.
•shut-off valve
Install the shut-off valve as close to S1156 as possible.
•vent valve
When necessary you should install vent valves in the cli-
mate system.
•When connecting to a system with thermostats, either a
bypass valve must be fitted or, alternatively, some of the
thermostats must be removed to ensure there is sufficient
flow and heat emission.
P
XL1
XL2
Cold and hot water
Hot water production is activated in the start guide or in
menu 7.2 - "Accessory settings".
Stop temperature for hot water must be at least 60°C.
NOTE
If S1156 is not docked to a water heater, the con-
nection for the water heater (XL9) must be
plugged.
CONNECTING THE HOT WATER HEATER
Install as follows:
•controlling hot water sensor (BT5)1
Optimises hot water operation. The sensor is optional and
is placed between BT6 and BT7 in the water heater.
•controlling hot water sensor (BT6)
17Chapter 4 | Pipe connectionsNIBE S1156

The sensor is placed in the middle of the water heater.
•displayed hot water sensor (BT7)1
The sensor is optional and is placed in the top of the water
heater.
•shut-off valve
•non-return valve
•enclosed expansion relief valve (FL1)
•mixing valve
A mixing valve must be installed when the factory setting
for hot water is changed. National regulations must be
observed.
•pressure relief valve
•expansion vessel
The expansion vessel (CM4) accommodates expansion
that results from heating the water inside the unit. The
expansion vessel must be connected between the expan-
sion relief valve (FL1) and the water heater. The location
of the expansion vessel should allow access to recharge
the pressure when neccessary.
•tundish
1The sensor is factory fitted on some water heater/accumulator
tank models from NIBE.
XL9
XL2
Installation alternative
S1156 can be installed in several different ways, some of
which are shown here.
Further option information is available at nibe.co.uk and in
the respective assembly instructions for the accessories
used. See page 70 for a list of the accessories that can be
used with S1156.
HOT WATER CIRCULATION
A circulation pump can be controlled by S1156 to circulate
the hot water. The circulating water must have a temperat-
ure that prevents bacterial growth and scalding, and national
standards must be satisfied.
The HWC return is connected to a freestanding water heater.
The circulation pump is activated via the AUX output in menu
7.4 -"Selectable in/outputs".
HWC can be supplemented with a hot water sensor for HWC
(BT70) and (BT82), which is connected via the AUX input
and activated in menu 7.4 -"Selectable in/outputs".
-QZ1-FQ3
-QZ1-GP11
-QZ1-RM1
-QZ1-RN1
-QZ1
BUFFER VESSEL (UKV)
UKV is an accumulator tank that is suitable for connection
to a heat pump or another external heat source, and can
have several different applications.
For further information, see the Installer Manual for the ac-
cessory.
Volume
A 2-pipe-connected buffer vessel is used when the system
volume in the climate system is less than the minimum re-
commended volume for the heat pump.
NIBE S1156Chapter 4 | Pipe connections18

FIXED CONDENSING
If the heat pump is to work towards an accumulator tank
with fixed condensing, you must connect an external supply
temperature sensor (BT25). The sensor is placed in the tank.
The connection for the hot water heater (XL9) on S1156 is
plugged.
The following menu settings are made:
Menu setting (local variations
may be required)
Menu
Desired temperature in the tank.1.30.4 - min. flow line temp.
heating
Desired temperature in the tank.1.30.6 - max flow line temperat-
ure
intermittent7.1.2.1 - op. mod heat med pump
manual4.1 - op. mode
GROUND WATER SYSTEM
An intermediate heat exchanger is used to protect the heat
pump’s exchanger from dirt. The water is released into a
buried infiltration unit or a drilled well. The circuit between
the heat pump and the intermediate heat exchanger must
be mixed with antifreeze. See "Possible selections for AUX
output" for more information about connecting a groundwa-
ter pump.
If this docking alternative is used, "min. brine out" in menu
7.1.2.8 "br pmp al set." must be changed to a suitable value
to prevent freezing of the heat exchanger.
-EP12-GP3
-EP12-HQ40
-EP12-EP4
-EP12-AA25
-EP12
VENTILATION RECOVERY
The installation can be supplemented with the exhaust air
module NIBE FLM S45 to provide ventilation recovery.
•Pipes and other cold surfaces must be insulated with dif-
fusion-proof material to prevent condensation.
•The brine system must be supplied with a pressure expan-
sion vessel. If there is a level vessel this should be re-
placed.
P
EXTRA CLIMATE SYSTEM
In buildings with several climate systems that require differ-
ent supply temperatures, the accessory ECS 40/ECS 41 can
be connected.
A shunt valve then lowers the temperature to the underfloor
heating system, for example.
-EP21-GP10-EP21-BT2
-EP21-AA25
-EP21-BT3
-EP21-QN25
-EP21
19Chapter 4 | Pipe connectionsNIBE S1156

COOLING
The accessory PCS 44 allows the connection of passive
cooling, for example with fan coils. The cooling system is
connected to the heat pump brine circuit, whereby cooling
is supplied from the collector via a circulation pump and
shunt valve.
•Pipes and other cold surfaces must be insulated with dif-
fusion-proof material to prevent condensation.
•Where the cooling demand is high, fan convectors with
drip trays and drain connection are needed.
•The brine system must be supplied with a pressure expan-
sion vessel. If there is a level vessel this should be re-
placed.
-EP25-AA25
-EP25-QN18-EP25-BT64
-EP25-GP13
-EP25-BT65 -EP25-RM1
-EP25
POOL
With the POOL 40 accessory, you can heat the pool with
your system.
During pool heating, the heating medium circulates between
the S1156 and the pool exchanger using the heat pump’s
internal circulation pump.
-CL11-HQ4-CL11-BT51-CL11-GP9
-CL11-EP5
-CL11-AA25
-CL11
NIBE S1156Chapter 4 | Pipe connections20