Nibe S1256 User guide

Installer manual
Ground source heat pump
NIBE S1256
IHB EN 2326-2
631115

Quick guide
NAVIGATION
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edge show that there
are more pages.
If the menu has several
sub-menus, you can
see more information
by dragging up or down
with your finger.
Most options and func-
tions are activated by
lightly pressing on the
display with your finger.
Drag to the right or left
with your finger to
browse between the
pages.
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
S1256
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
S1256 is connected to myUplink).
Here, you can start or stop a temporary increase in the hot water
temperature.

41 Important information
4Safety information
4Symbols
4Marking
4Serial number
5Inspection of the installation
62 Delivery and handling
6Transport
6Assembly
7Supplied components
7Handling panels
9Removing insulation
103 The heat pump design
10General
11Distribution boxes
12Cooling module
144 Pipe connections
14General
15Dimensions and pipe connections
16Brine side
17Climate system
17Cold and hot water
17Installation alternative
205 Electrical connections
20General
22Connections
27Settings
306 Commissioning and adjusting
30Preparations
30Filling and venting
31Start-up and inspection
34Setting the heating curve
367 myUplink
36Specification
36Connection
36Range of services
378 Control - Introduction
37Display unit
38Navigation
38Menu types
40Climate systems and zones
419 Control - Menus
41Menu 1 - Indoor climate
44Menu 2 - Hot water
46Menu 3 - Info
47Menu 4 - My system
51Menu 5 - Connection
52Menu 6 - Scheduling
53Menu 7 - Installer settings
6110 Service
61Service actions
6611 Disturbances in comfort
66Info-menu
66Manage alarm
66Troubleshooting
6812 Accessories
7013 Technical data
70Dimensions
71Electrical data
73Technical specifications
77Energy labelling
82Item register
87Contact information
3Table of ContentsNIBE S1256
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.eu.
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 S1256,
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 S1256Chapter 1 | Important information4
Important information

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
Current sensor
Safety breaker
Earth circuit-breaker
Set emergency mode in menu 7.1.8.2
5Chapter 1 | Important informationNIBE S1256

Transport
S1256 should be transported and stored vertically in a dry
place. When being moved into a building, S1256 may be leant
back 45 °.
Ensure that S1256 has not been damaged during transport.
Caution
The product can be tail heavy.
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 63 for instructions about the separation.
Assembly
•Position S1256 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 S1256, the area where S1256 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
S1256 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.
NIBE S1256Chapter 2 | Delivery and handling6
Delivery and handling

Supplied components
LEK
Current sensor1
3 x
Room
sensor(BT50)
1 x
Outdoor temperat-
ure sensor (BT1)
1 x
LEK
Safety valve (FL3)
0.3 MPa (3 bar)1
1 x
LEK
Level vessel
(CM2)1
1 x
O-rings
8 x
Label for external
control voltage for
the control system
1 x
Compression ring
couplings
8 kW
2 x (ø28 x G25)
2 x (ø22 x G20)
13 kW
4 x (ø28 x G25)
18 kW
4 x (ø28 x G25)
Filterball (QZ2)
8 kW
1 x G1
1 x G3/4
13 kW
1 x G1
1 x G1 1/4
18 kW
1 x G1
1 x G1 1/4
1Not Italy and the DACH countries.
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
7Chapter 2 | Delivery and handlingNIBE S1256

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.
NIBE S1256Chapter 2 | Delivery and handling8

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
3. Move the panel outwards and backwards.
UN
4. Assembly takes place in the reverse order.
Removing insulation
The insulation can be removed to make installation easier.
UN
9Chapter 2 | Delivery and handlingNIBE S1256

General
UN
BT7
QN10
BT2
EB1
PZ1
EP14-QM34
EP14-QM31
BT6
EP14-QM32
EP14-QM33
PZ2
QM22 UB1
AA4
SF1
XL1
XL6
XL4 XL3
XL7
XL2
BF1
UB2
FC1
XL5
XF8
FR1
XF3
EP14
RA3
BT5
PIPE CONNECTIONS
Connection, heating medium flowXL1
Connection, heating medium returnXL2
Connection, cold waterXL3
Connection, hot waterXL4
Connection, HWC1 XL5
Connection, brine inXL6
Connection, brine outXL7
1Only heat pumps with enamelled or stainless steel vessel.
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
Venting, coilQM22
Shuttle valve, climate system/water heaterQN10
SENSORS ETC.
Flow meterBF1
Temperature sensors, heating medium flowBT2
Temperature sensor, hot water charging startBT5
Temperature sensor, hot water chargingBT6
Temperature sensor, hot water topBT7
ELECTRICAL COMPONENTS
Display unitAA4
Immersion heaterEB1
Miniature circuit breaker1 FC1
Electrical anode2 FR1
Choke3 RA3
On/off buttonSF1
USB socketXF3
Network connection for myUplinkXF8
1S1256-8 3x400 V is not equipped with miniature circuit breakers (FC1).
2Only heat pump with enamelled vessel.
3Only for S1256-13 3x400 V
MISCELLANEOUS
Rating platePZ1
Identification plate, cooling modulePZ2
Cable glandUB1
Cable glandUB2
Designations according to standard EN 81346-2.
NIBE S1256Chapter 3 | The heat pump design10
The heat pump design