Nibe S1255 User guide

Installer manual
Ground source heat pump
NIBE S1255
IHB EN 2150-1
631729

Quick guide
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If the menu has several
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Most options and func-
tions are activated by
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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
S1255
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 S1255 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
11Cooling sections
134 Pipe connections
13General
14Dimensions and pipe connections
15Brine side
16Climate system
16Cold and hot water
16Installation alternative
185 Electrical connections
18General
20Connections
25Settings
286 Commissioning and adjusting
28Preparations
28Filling and venting
29Start-up and inspection
31
Setting the cooling/heating curveSetting the
heating curve
337 myUplink
33Specification
33Connection
33Range of services
348 Control - Introduction
34Display unit
35Navigation
35Menu types
37Climate systems and zones
389 Control - Menus
38Menu 1 - Indoor climate
41Menu 2 - Hot water
43Menu 3 - Info
44Menu 4 - My system
47Menu 5 - Connection
48Menu 6 - Scheduling
49Menu 7 - Installer settings
5710 Service
57Service actions
6211 Disturbances in comfort
62Info-menu
62Manage alarm
62Troubleshooting
6412 Accessories
6613 Technical data
66Dimensions and setting-out coordinates
67Electrical data
68Technical specifications
73Energy labelling
84Item register
87Contact information
3Table of ContentsNIBE S1255
Table of Contents

Safety information
This manual describes installation and service procedures
for implementation by specialists.
The manual must be left with the customer.
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).
Read the User Manual.
Read the Installer Manual.
Serial number
The serial number can be found at the bottom right on S1255,
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 S1255Chapter 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 S1255

Transport
S1255 should be transported and stored vertically in a dry
place. When being moved into a building, S1255 may be leant
back 45 °.
Ensure that S1255 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 59 for instructions about the separation.
Assembly
•Place S1255 on a solid foundation indoors that can take
the heat pump’s weight.
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
•Because water comes from S1255, the area where the
heating pump 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
S1255 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 S1255Chapter 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
Compression ring
couplings
6 KW
2 x (ø28 x G25)
2 x (ø22 x G20)
12/16 KW
4 x (ø28 x G25)
Filterball (QZ2)
6 KW
1 x G1
1 x G3/4
12/16 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
ASSEMBLE THE FRONT
1. Hook one bottom corner of the front onto the frame.
7Chapter 2 | Delivery and handlingNIBE S1255

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
3. Move the panel outwards and backwards.
UN
4. Assembly takes place in the reverse order.
NIBE S1255Chapter 2 | Delivery and handling8

Removing insulation
The insulation can be removed to make installation easier.
UN
9Chapter 2 | Delivery and handlingNIBE S1255

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
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 sectionEP14
EP14-QM31 Shut-off valve, heating medium supply
EP14-QM32 Shut off valve, heating medium return
EP14-QM33 Shut off valve, brine out
EP14-QM34 Shut-off valve, brine in
Venting, coilQM22
Shuttle valve, climate system/water heaterQN10
SENSORS ETC.
Flow meterBF1
Temperature sensors, heating medium flowBT2
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
1S1255-6 3x400 V is not equipped with miniature circuit breakers (FC1).
2Only heat pump with enamelled vessel.
3Only for S1255-12 3x400 V.
MISCELLANEOUS
Rating platePZ1
Identification plate, cooling modulePZ2
Cable glandUB1
Cable glandUB2
Designations according to standard EN 81346-2.
NIBE S1255Chapter 3 | The heat pump design10
The heat pump design