Nibe F1255PC BE User guide

IHB EN 1835-1
531065
INSTALLER MANUAL
Ground source heat pump
NIBE F1255PC BE

Quick guide
Navigation
Ok button (confirm/select)
Back button (back/undo/exit)
Control knob (move/increase/reduce)
A detailed explanation of the button functions can be found on page 36.
How to scroll through menus and make different settings is described on page 38.
Set the indoor climate
2X
INDOOR CLIMATE
HEAT PUMP INFO
HOT WATER
The mode for setting the indoor temperature is accessed by pressing the OK button twice, when in the start
mode in the main menu.
Increase hot water volume
2X
1X
To temporarily increase the amount of hot water, first turn the control knob to mark menu 2 (water droplet)
and then press the OK button twice.

41 Important information
4Safety information
4Symbols
4Marking
4Serial number
4Recovery
5Environmental information
6Inspection of the installation
72 Delivery and handling
7Transport
7Assembly
8Supplied components
8Removing the covers
9Removing parts of the insulation
103 The heat pump design
10General
12Distribution boxes
13Cooling section
144 Pipe connections
14General
15Dimensions and pipe connections
16Brine side
16Heating medium side
17Water heater
17Docking alternatives
205 Electrical connections
20General
22Connections
24Settings
25Optional connections
29Connecting accessories
306 Commissioning and adjusting
30Preparations
30Filling and venting
31Start guide
32Post adjustment and venting
34Setting the cooling/heating curve
367 Control - Introduction
36Display unit
37Menu system
408 Control - Menus
40Menu 1 - INDOOR CLIMATE
40Menu 2 - HOT WATER
40Menu 3 - INFO
41Menu 4 - HEAT PUMP
42Menu 5 - SERVICE
529 Service
52Service actions
5910 Disturbances in comfort
59Info-menu
59Manage alarm
59Troubleshooting
6211 Accessories
6412 Technical data
64Dimensions and setting-out coordinates
65Technical specifications
68Energy labelling
71Item register
75Contact information
3Table of ContentsNIBE F1255PC BE
Table of Contents

Safety information
This manual describes installation and service proced-
ures for implementation by specialists.
The manual must be left with the customer.
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 super-
vision 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.
Rights to make any design or technical
modifications are reserved.
©NIBE 2018.
Symbols
NOTE
This symbol indicates danger to person or ma-
chine .
Caution
This symbol indicates important information
about what you should consider when installing
or servicing the installation.
TIP
This symbol indicates tips on how to facilitate
using the product.
Marking
The CE mark is obligatory for most products sold in
the EU, regardless of where they are made.
CE
Classification of enclosure of electro-technical equip-
ment.
IP21
Danger to person or machine.
!
Read the User Manual.
Serial number
The serial number can be found at the bottom right of
the front cover and in the info menu (menu 3.1) and on
the type plate (PF1).
Serial number
Caution
You need the product's ((14 digit) serial number
for servicing and support.
Recovery
Leave the disposal of the packaging to the in-
staller who installed the product or to special
waste stations.
Do not dispose of used products with normal
household waste. It must be disposed of at a
special waste station or dealer who provides this type
of service.
Improper disposal of the product by the user results in
administrative penalties in accordance with current le-
gislation.
NIBE F1255PC BEChapter 1 | Important information4
1 Important information

Environmental
information
This unit contains a fluorinated greenhouse gas that is
covered by the Kyoto agreement.
F-GAS REGULATION (EU) NO. 517/2014
The equipment contains R407C, a fluorinated green-
house gas with a GWP value (Global Warming Potential)
of 1,774. Do not release R407C into the atmosphere.
5Chapter 1 | Important informationNIBE F1255PC BE

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 (page 16)
System flushed
System vented
Antifreeze
Level/Expansion vessel
Filterball (particle filter)
Safety valve
Shut off valves
Circulation pump setting
Heating medium (page 16)
System flushed
System vented
Expansion vessel
Filterball (particle filter)
Safety valve
Shut off valves
Circulation pump setting
Electricity (page 20)
Connections
Main voltage
Phase voltage
Fuses heat pump
Fuses property
Outside sensor
Room sensor
Current sensor
Safety breaker
Earth circuit-breaker
Setting of emergency mode thermostat
NIBE F1255PC BEChapter 1 | Important information6

Transport
F1255PC BE should be transported and stored vertically
in a dry place. When being moved into a building,
F1255PC BE may be leant back 45 °.
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
cabinet.
See page 54 for instructions about the separation.
Assembly
• Position F1255PC BE on a fixed foundation that can
take the weight of the heat pump. Use the product's
adjustable feet to obtain a horizontal and stable set-
up.
30 - 50 mm
30 - 50 mm
15 - 40 mm
20-55 mm
• Because water comes from F1255PC BE, 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.
Approx. 50 mm free space is required on each side, to
remove the side panels (see image). The panels do not
need to be removed during service. All service on
F1255PC BE can be carried out from the front. Leave
space between the heat pump and the wall behind (and
any routing of supply cables and pipes) to reduce the
risk of any vibration being propagated.
(50) (50)
800
*
*
* A normal installation needs 300 – 400 mm (any side) for connection
equipment, i.e. level vessel, valves and electrical equipment.
7Chapter 2 | Delivery and handlingNIBE F1255PC BE
2 Delivery and handling

Supplied components
O-rings
8 x
Room sensor
1 x
Outside sensor
1 x
Filterball
1 x G1
1 x G3/4
Compression ring
couplings
2 x (ø28 x G25)
2 x (ø22 x G20)
IN ITALY AND THE DACH COUNTRIES, THE
FOLLOWING COMPONENTS ARE NOT
ENCLOSED.
LEK
Level vessel
1 x
LEK
Safety valve
0.3 MPa (3 bar)
1 x
LEK
LEK
LEK
Current sensor
3 x
LOCATION
The kit of supplied items is placed in packaging on top
of the heat pump.
Removing the covers
FRONT COVER
1
2
LEK
LEK
LEK
LEK
LEK
1. Remove the screws from the lower edge of the
front panel.
2. Lift the panel out at the bottom edge and up.
SIDE COVERS
LEK
LEK
LEK
The side covers can be removed to facilitate the install-
ation.
1. Remove the screws from the upper and lower
edges.
2. Twist the cover slightly outward.
3. Move the hatch outwards and backwards.
4. Assembly takes place in the reverse order.
NIBE F1255PC BEChapter 2 | Delivery and handling8

Removing parts of the
insulation
Parts of the insulation can be removed to facilitate the
installation.
INSULATION, TOP
1. Disconnect the cable from the motor and remove
the motor from the shuttle valve as illustrated.
LEK
LEK
A
B
LEK
2. Grip the handle and pull straight out as illustrated.
LEK
INSULATION, IMMERSION HEATER
NOTE
Electrical installation and service must be car-
ried out under the supervision of a qualified
electrician. Electrical installation and wiring
must be carried out in accordance with the
stipulations in force.
1. Remove the cover for the junction box according to
the description on page 20.
2. Grip the handle and pull the insulation carefully to-
wards you as illustrated.
LEK
9Chapter 2 | Delivery and handlingNIBE F1255PC BE

General
F1255
BT7
QN10
BT2
EB1
UB1
QM34
QM22
UB3
AA4
AA4-XJ3
BT6
UB2
QM32
AA4-XJ4
SF1
QM33
XL1
XL6 XL7
XL4 XL3 XL2
FR1
PF1
PF2
QM31
W130
UN
BT7
QN10
BT2
EB1
PF1
UB1
QM34
QM31
BT6
UB2
QM32
QM33
PF2
QM22 UB3
AA4
W130
SF1
AA4-XJ4
AA4-XJ3
XL1
XL6
XL4 XL3
XL7
XL2
FR1
VIEW FROM ABOVE
XL5 BT7
VIEW FROM BEHIND
BF1
NIBE F1255PC BEChapter 3 | The heat pump design10
3 The heat pump design

PIPE CONNECTIONS
Connection, heating medium flowXL1
Connection, heating medium returnXL2
Connection, cold waterXL3
Connection, hot waterXL4
Connection, HWCXL5
Connection, brine inXL6
Connection, brine outXL7
HVAC COMPONENTS
Venting, coilQM22
Shut-off valve, heating medium flowQM31
Shut off valve, heating medium returnQM32
Shut off valve, brine outQM33
Shut-off valve, brine inQM34
Shuttle valve, climate system/water heaterQN10
SENSORS ETC.
Flow meter**BF1
Outdoor temperature sensor*BT1
Temperature sensors, heating medium flowBT2
Temperature sensor, hot water chargingBT6
Temperature sensor, hot water topBT7
**Only heat pumps with energy meter
* Not illustrated
ELECTRICAL COMPONENTS
Display unit
AA4-XJ3 USB socket
AA4-XJ4 Service outlet (No function)
AA4
Immersion heaterEB1
SwitchSF1
Network cable for NIBE UplinkW130
MISCELLANEOUS
Rating platePF1
Type plate, cooling sectionPF2
Cable gland, incoming electricityUB1
Cable glandUB2
Cable gland, rear side, sensorUB3
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
11Chapter 3 | The heat pump designNIBE F1255PC BE

Distribution boxes
UN
F1255
FD1
AA8
AA1
FA1
AA3
AA23
AA2
AA7
FD1
AA1
FA1
AA3
AA23
AA2
AA7
AA8
ELECTRICAL COMPONENTS
Immersion heater cardAA1
Base cardAA2
Input circuit boardAA3
Extra relay circuit boardAA7
Communication boardAA23
Miniature circuit-breakerFA1
Temperature limiter/Emergency mode thermostatFD1
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
NIBE F1255PC BEChapter 3 | The heat pump design12

Cooling section
3 x 400, 6 kW
LEK LEK
BT12
EP6
BT3
GP1
GP2
QM2
QM1
AA100
BT10
BT11
QN18
3 x 400, 6 kW
LEK LEK
EP2
BT14QA40
BT17
CA1
RA1
BT15
BP1
BP2
EB10
EP1
GQ10
HS1
XL20
QN1
XL21
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
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
ELECTRICAL COMPONENTS
Joint cardAA100
Compressor heaterEB10
InverterQA40
COOLING COMPONENTS
EvaporatorEP1
CondenserEP2
Heat exchanger, coolingEP6
CompressorGQ10
Drying filterHS1
Expansion valveQN1
Mixing valve, coolingQN18
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
13Chapter 3 | The heat pump designNIBE F1255PC BE

General
Pipe installation must be carried out in accordance with
current norms and directives. F1255PC BE can operate
with a return temperature of up to 58 °C and an outgoing
temperature from the heat pump of 70 (65 °C with only
the compressor).
F1255PC BE 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 system needs to be flushed out be-
fore the heat pump is connected so that debris
cannot damage component parts.
NOTE
The climate system must be adjusted for both
heating and cooling operation.
SYMBOL KEY
MeaningSymbol
Shut-off valve
Non-return valve
Mixing valve
Shunt / shuttle valve
Safety valve
Temperature sensor
Pressure gauge
Circulation pump
MeaningSymbol
Particle filter
Filterball (ball valve with integrated particle filter)
Compressor
Expansion vessel
Level vessel
Heat exchanger
NIBE F1255PC BEChapter 4 | Pipe connections14
4 Pipe connections

SYSTEM DIAGRAM
F1255PC BE consists of a heat pump, water heater,
electrical module, circulation pumps and a control sys-
tem. F1255PC BE 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 refrigerant, 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 the water heater.
If there is a greater need for heating/hot water than the
compressor can provide there is an integrated immersion
heater.
The brine can also be circulated via a mixing valve to a
heat exchanger. There the brine cools the heating sys-
tem's water so that comfort cooling can be maintained
during the hotter periods of the year.
VVKV
KBinVBf VBr KBut
XL1 XL6 XL7XL4 XL3 XL2
VVKV
KBinVBf VBr KBut
Connection, heating medium flowXL1
Connection, heating medium returnXL2
Connection, cold waterXL3
Connection, hot waterXL4
Connection, brine inXL6
Connection, brine outXL7
Dimensions and pipe
connections
620
600
560 440
70
1775
650*
25-50
25
50
130
210
390
470
525
650*
620
600
560 440
70
1775
650*
25-50
25
50
130
210
390
470
525
650*
XL1 XL6 XL7XL4 XL3 XL2
PIPE DIMENSIONS
Connection
28(mm)(XL6)/(XL7) Brine in/out ext Ø
22(mm)(XL1)/(XL2) Heating medium flow/return ext Ø
22(mm)(XL3)/(XL4) Cold/hot water Ø
* Can be angled for side connection.
15Chapter 4 | Pipe connectionsNIBE F1255PC BE

Brine side
COLLECTOR
Caution
The length of the collector hose varies depend-
ing on the rock/soil conditions, climate zone
and on the climate system (radiators or under-
floor heating) and the heating requirement of
the building Each installation must be sized in-
dividually.
Max length per coil for the collector should not exceed
400 m.
In those cases where it is necessary to have several
collectors, 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.
SIDE CONNECTION
It is possible to angle the brine connections, for connec-
tion 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.
CONNECTING THE BRINE SIDE
• Insulate all indoor brine pipes against condensation.
• The level vessel must be installed at the highest point
in the brine system, on the incoming pipe before the
brine pump (Alt. 1).
If the level vessel cannot be placed at the highest
point, an expansion vessel must be used (Alt. 2).
NOTE
Note that condensation may drip from the level
vessel. Position the vessel so that this does
not harm other equipment.
• Details of the antifreeze used must be shown on the
level vessel.
•Install the enclosed safety valve under the level vessel
as illustrated. The entire length of the overflow water
pipe from the safety valve must be inclined to prevent
water pockets and must also be frost-free.
• Install shut off valves as close to the heat pump as
possible.
• Fit the enclosed filterball on the incoming pipe.
In the case of connection to an open groundwater sys-
tem, 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
Alt. 1 Alt. 2
XL6
XL7
Heating medium side
CONNECTING THE CLIMATE SYSTEM
A climate system is a system that regulates indoor
comfort with the help of the control system in F1255PC
BE and for example radiators, underfloor heating/cooling,
fan convectors etc.
•Install all necessary safety devices, shut-off valves (as
close to the heat pump as possible) and the enclosed
filterball.
NIBE F1255PC BEChapter 4 | Pipe connections16

•The safety valve must have a maximum 0.25 MPa (2.5
bar) opening pressure and be installed on the heating
medium return as illustrated. The entire length of the
overflow water pipe from the safety valves must be
inclined to prevent water pockets and must also be
frost proof.
• When connecting to a system with thermostats on all
radiators, a relief valve must be fitted, or some of the
thermostats must be removed to ensure sufficient
flow.
P
XL1 XL4 XL3 XL2
Water heater
CONNECTING THE HOT WATER HEATER
• The hot water heater in the heat pump must be sup-
plied with necessary set of valves.
• The mixing valve must be installed if the setting is
changed so that the temperature can exceed 60 °C.
• The setting for hot water is made in menu 5.1.1.
• The safety valve must have a maximum opening
pressure of 1.0 MPa (10.0 bar) and be installed on the
incoming domestic water line as illustrated. The entire
length of the overflow water pipe from the safety valve
must be inclined to prevent water pockets and must
also be frost-free.
Docking alternatives
F1255PC BE can be connected in several different ways,
some of which are shown below.
Further option information is available at nibe.eu and in
the respective assembly instructions for the accessories
used. See page 62 for a list of the accessories that can
be used with F1255PC BE.
BUFFER VESSEL
If the climate system volume is too small for the heat
pump output, the radiator system can be supplemented
with a buffer vessel, for example NIBE UKV.
UKV
P
P
EXTRA ELECTRIC HOT WATER HEATER
The heat pump should be supplemented with an electric
water heater, if a hot tub or other significant consumer
of hot water is installed.
VV
KV
COMPACT
CW
HW
17Chapter 4 | Pipe connectionsNIBE F1255PC BE

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 filtration unit or a drilled well. See page 28
for more information about connecting a ground water
pump.
If this docking alternative is used, "min. brine out" in
menu 5.1.7 "br pmp al set." must be changed to a suit-
able value to prevent freezing in the heat exchanger.
VENTILATION RECOVERY
The installation can be supplemented with the exhaust
air module FLM to enable ventilation recovery.
• Pipes and other cold surfaces must be insulated with
diffusion-proof material to prevent condensation.
• The brine system must be supplied with a pressure
expansion vessel (CM3). If there is a level vessel
(CM2) this should be replaced.
P
P
Extract air
Exhaust
air
FLM
Extract air
Ø 160
Exhaust air
Ø 160
UNDERFLOOR HEATING
SYSTEM/PREHEATING FTX
The external circulation pump is dimensioned for the
under floor heating system’s demand.
To ensure a heating supply during hot water production,
the heating system can be supplemented with a NIBE
UKV vessel, e.g. when there is a water coil in the FTX
ventilation.
P
UKV
TWO OR MORE CLIMATE SYSTEMS
In buildings with several climate systems that require
different supply temperatures, the accessory
ECS 40/ECS 41 can be connected. A shunt valve then
lowers the temperature to the underfloor heating sys-
tem, for example.
P
NIBE F1255PC BEChapter 4 | Pipe connections18

POOL
By supplementing the installation with the accessory
POOL 40, pool heating is enabled in your climate unit.
During pool heating, the heating medium circulates
between the F1255PC BE and the pool exchanger using
the heat pump’s internal circulation pumps.
P
19Chapter 4 | Pipe connectionsNIBE F1255PC BE

General
All electrical equipment, except the outdoor sensors,
room sensors and the current sensors are ready connec-
ted at the factory.
• Disconnect the heat pump before insulation testing
the house wiring.
• If the building is equipped with an earth-fault breaker,
F1255PC BE should be equipped with a separate one.
• If a miniature circuit breaker is used this should have
at least motor characteristic “C”. See page 65 for fuse
size.
• Electrical wiring diagrams for the heat pump, see
separate installation handbook for electrical wiring
diagrams.
•Communication and sensor cables to external connec-
tions must not be laid close to high current cables.
• The minimum area of communication and sensor
cables to external connections must be 0.5 mm² up
to 50 m, for example EKKX or LiYY or equivalent.
• When cable routing in F1255PC BE, cable grommets
(e.g. UB1-UB3, marked in image) must be used. In
UB1-UB3 the cables are inserted through the heat
pump from the back to the front.
NOTE
The switch (SF1) must not be moved to "" or
" " until the boiler has been filled with water.
Component parts of the product can be dam-
aged.
NOTE
Electrical installation and service must be car-
ried out under the supervision of a qualified
electrician. Cut the current with the circuit
breaker before carrying out any servicing.
Electrical installation and wiring must be carried
out in accordance with the stipulations in force.
NOTE
Check the connections, main voltage and phase
voltage before the machine is started, to pre-
vent damage to the heat pump electronics.
F1255
FD1
FA1
FD1-SF2
UB2
UB1
UB3
MINIATURE CIRCUIT-BREAKER
The heat pump operating circuit and some of its internal
components are internally fused by a miniature circuit
breaker (FA1).
TEMPERATURE LIMITER
The temperature limiter (FD1) cuts the power to the
electric additional heat if the temperature exceeds 89°C
and is reset manually.
Resetting
The temperature limiter (FD1) is accessible behind the
front cover. Reset the temperature limiter by pressing
the button (FD1-SF2) using a small screwdriver.
ACCESSIBILITY, ELECTRICAL CONNECTION
The plastic cap of the electrical boxes is opened using
a screwdriver.
NIBE F1255PC BEChapter 5 | Electrical connections20
5 Electrical connections