Nibe F750 User guide

IHB EN 1835-2
431822
INSTALLER MANUAL
Exhaust air heat pump
NIBE F750

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 40.
How to scroll through menus and make different settings is described on page 42.
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
5Serial number
5Recovery
5Environmental information
6Inspection of the installation
72 Delivery and handling
7Transport
7Assembly
8Supplied components
9Removing the covers
9Removing parts of the insulation
113 The heat pump design
11General
14Air treatment unit
154 Pipe and ventilation connections
15General pipe connections
16Dimensions and pipe connections
18Symbol key
18Cold and hot water
18Heating medium side
19Installation alternative
21General ventilation connection
21Ventilation flow
21Adjusting ventilation
22Dimension and ventilation connections
235 Electrical connections
23General
25Connections
28Settings
30Optional connections
33Connecting accessories
346 Commissioning and adjusting
34Preparations
34Filling and venting
35Start-up and inspection
407 Control - Introduction
40Display unit
41Menu system
448 Control - Menus
44Menu 1 - INDOOR CLIMATE
44Menu 2 - HOT WATER
45Menu 3 - INFO
45Menu 4 - HEAT PUMP
46Menu 5 - SERVICE
529 Service
52Maintenance
52Service actions
5610 Disturbances in comfort
56Info-menu
56Manage alarm
56Troubleshooting
5911 Accessories
6112 Technical data
61Dimensions and setting-out coordinates
63Technical specifications
67Energy labelling
69Electrical circuit diagram
81Item register
87Contact information
3Table of ContentsNIBE F750
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.
Water may drip from the safety valve's
overflow pipe, so this pipe must be inclined
along its entire length to prevent water
pockets. It must also be frost-proof. The
overflow pipe must be visible and its outlet
must be open.
F750 must be installed with a disconnection
option on the supply cable. Minimum cable
area must be sized according to the fuse
rating used. Electrical installation and wiring
must be carried out in accordance with applic-
able regulations.
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
Read the User Manual.
Read the Installer Manual.
NIBE F750Chapter 1 | Important information4
1 Important information

Serial number
The serial number can be found at the bottom right of
the front cover and in the info menu (menu 3.1).
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.
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 1774. Do not release R407C into the atmosphere.
5Chapter 1 | Important informationNIBE F750

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
✔
Ventilation (page 21)
Setting the ventilation flow
Heating medium (page 18)
System flushed
System vented
Safety valve
Circulation pump setting
Setting heating medium flow
Pressure in the climate system
Hot water (page 18)
Mixing valve
Safety valve
Electricity (page 23)
Connections
Main voltage
Phase voltage
Fuses heat pump
Fuses property
Outside sensor
Room sensor
Current sensor
Safety breaker
Earth circuit-breaker
NIBE F750Chapter 1 | Important information6

Transport
F750 should be transported and stored vertically in a dry
place. However. the F750 may be carefully laid on its
back when being moved into a building. The centre of
gravity is in the upper part.
R
0
R
0
Assembly
• Position F750 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.
Because water comes from F750, the floor coating is
important. A waterproof floor or floor membrane is
recommended.
30 - 50 mm
30 - 50 mm
15 - 40 mm
20-55 mm
•Because water comes from F750, it is good if the area
where the heating pump is located is provided 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.
• The heat pump's installation area should always have
a temperature of at least 10 °C and max 30 °C.
7Chapter 2 | Delivery and handlingNIBE F750
2 Delivery and handling

INSTALLATION AREA
Leave a free space of 800 mm in front of the product.
Leave free space between F750 and wall/other ma-
chinery/fittings/cables/pipes etc. It is recommended that
a space of at least 10 mm is left to reduce the risk of
noise and of any vibrations being propagated.
800
NOTE
Ensure that there is sufficient space (300 mm)
above the heat pump for installing ventilation
hoses.
Supplied components
Room sensorOutside sensor
LEK
Extra air filterVent hose
(length 4 m)
LEK
LEK
LEK
Current sensorDCO 10, vent socket (only
F750 copper)
Filterball
LOCATION
The kit of supplied items is placed on top of the product.
NIBE F750Chapter 2 | Delivery and handling8

Removing the covers
FRONT COVER
LEK
LEK
4
1
2
3
1. Remove the upper panel by pulling it straight out.
2. Remove the screws from the lower edge of the
front panel.
3. Lift the panel out at the bottom edge and up.
4. Pull the panel towards yourself.
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 backwards and slightly to the side.
4. Pull the cover to one side.
5. Pull the hatch forwards.
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 /
APH
2. Grip the handle and pull straight out as illustrated.
LEK/APH
9Chapter 2 | Delivery and handlingNIBE F750

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 24.
2. Grip the handle and pull the insulation carefully to-
wards you as illustrated.
LEK / APH
TIP
Remove the hatch for the immersion heater
card so that it is easier to remove the insulation
(see page 24).
NIBE F750Chapter 2 | Delivery and handling10

General
F750 COPPER
N
UN
LEK / APH
LEK /
LEK /
APH
QN10
AA1
BT7
BT63
EB1
BT30
FQ10
XL4 XL3
RF3
AA2
BT6
AA23
AA3
AA4-XF3
AA4-XF4
SF1
AA4
UB2
UB1
W130
GP1
XL2
QM22QM23 QM20
BP5
WP3
FL1
GP6
QM11
BT62
WP1
WM2
WM1
RM1
CM1 XL10
QM10
BT61
FL2
QM31
WM6
QN27XL5
WP2
XL1
FC1
PZ1
PZ3
11Chapter 3 | The heat pump designNIBE F750
3 The heat pump design

F750 STAINLESS STEEL
LEK / APH
LEK /
APH
QN10
AA1
BT7
BT63
EB1
BT30
FQ10
XL4 XL3
XL1
RF3
AA2
BT6
AA23
AA3
AA4-XF3
AA4-XF4
SF1
AA4
UB2
UB1
W130
GP1
XL2
QM22QM23 QM20
BP5
WP3
FL1
GP6
QM11
BT62
WM2
RM1
CM1 XL10
QM10
BT61
FL2
QM31
WM6
QN27
LEK
BF1
XL5
FQ1QM13 WP1
WM1
WP2
PZ1
PZ3
FC1
NIBE F750Chapter 3 | The heat pump design12

PIPE CONNECTIONS
Connection, heating medium flow lineXL1
Connection, heating medium return lineXL2
Connection, cold waterXL3
Connection, hot waterXL4
Connection, hot water circulationXL5
Connection, draining heating mediumXL10
HVAC COMPONENTS
Expansion vesselCM1
Safety valve, water heaterFL1
Safety valve, climate systemFL2
Mixer valve, hot water3 FQ1
Circulation pumpGP1
Heating medium pump2GP6
Filler valve, hot water heaterQM10
Filler valve, climate systemQM11
Filler valve 2, climate system3 QM13
Venting, heating mediumQM20
Venting, coilQM22
Venting, buffer tankQM23
Shut-off valve, heating medium flowQM31
Shuttle valve, climate system/water heaterQN10
Reversing valve, circulation climate systemQN27
Non-return valveRM1
Overflow cupWM1
Overflow water dischargeWM2
Water sealWM6
Overflow pipe, safety valve hot water heaterWP1
Overflow pipe, safety valve climate systemWP2
Overflow pipe, condensationWP3
SENSORS ETC.
Flow sensor (located on the rear of the machine)3 BF1
Pressure gauge, heating systemBP5
Outside sensor1 BT1
Temperature sensor, hot water, controlBT6
Temperature sensor, hot water, displayBT7
Thermostat, backup heatingBT30
Room sensor1 BT50
Temperature sensor, heating medium flow after
buffer vessel
BT61
Temperature sensor, heating medium return after
buffer vessel
BT62
Temperature sensor, heating medium supply after
immersion heater
BT63
ELECTRICAL COMPONENTS
Immersion heater cardAA1
Base cardAA2
Input circuit boardAA3
Display unit
AA4-XF3 USB socket
AA4-XF4 Service socket
AA4
Communication boardAA23
Immersion heaterEB1
Miniature circuit-breakerFC1
Temperature limiterFQ10
EMC cardRF3
SwitchSF1
Network cable for NIBE UplinkTM W130
MISCELLANEOUS
Rating platePZ1
Serial number platePZ3
Cable glandUB1-2
1Not visible in the image
2Only F750 copper.
3Only F750 stainless steel.
Designations in component locations according to standard IEC 81346-
2.
13Chapter 3 | The heat pump designNIBE F750

Air treatment unit
LEK
LEK
LEK / APH
LEK /
LEK /
APH
BP2
BT21
BT3
QM24
GQ2
GQ10
BT14
BP1
AA101
BT16
EP1
QN1
BT17
BS1
BT20
QQ1
CA1 QA40
RA1
XL31
XL32
EB16
FQ12
HZ2
BT15
BT12
EP2
PIPE CONNECTIONS
Ventilation connection, exhaust airXL31
Ventilation connection, extract airXL32
HVAC COMPONENTS
Venting, heat exchangerQM24
SENSORS ETC.
High pressure pressostatBP1
Low pressure pressostatBP2
Air speed sensorBS1
Temperature sensors, heating medium returnBT3
Temperature sensor, heating medium flow after
condenser
BT12
Temperature sensor, hot gasBT14
Temperature sensor, fluid pipeBT15
Temperature sensor, evaporator1 BT16
Temperature sensor, suction gasBT17
Temperature sensor, exhaust airBT20
Temperature sensor, extract airBT21
ELECTRICAL COMPONENTS
Connection card sensorAA101
CapacitorCA1
Defrosting elementEB16
Temperature limiter, defrosting elementFQ12
InverterQA40
ChokeRA1
COOLING COMPONENTS
EvaporatorEP1
CondenserEP2
CompressorGQ10
Drying filterHZ2
Expansion valveQN1
VENTILATION
Exhaust air fanGQ2
Exhaust air filter1 HQ10
Filter cover, exhaust airQQ1
1Not visible in the image
2Only F750 copper. 3Only F750 stainless steel.
Designations in component locations according to standard IEC 81346-
2.
NIBE F750Chapter 3 | The heat pump design14

General pipe
connections
Pipe installation must be carried out in accordance with
current norms and directives.
The system requires the radiator circuit to be designed
for a low temperature heating medium. At the lowest
dimensioned outdoor temperature (DOT) the highest
recommended temperatures are 55 °C on the supply
line and 45 °C on the return line.
Overflow water from the evaporator collection tray and
safety valves passes via a non-pressurised pipe to an
overflow cup, and from there to a drain, so that hot
water splashes cannot cause injury. The entire length
of the overflow water pipe must be inclined to prevent
water pockets and must also be frost-proof.
NOTE
The pipe system needs to be flushed out be-
fore the heat pump is connected so that any
debris cannot damage component parts.
Caution
Ensure that incoming water is clean. When
using a private well, it may be necessary to
supplement with an extra water filter.
MAX. VOLUME IN THE HEATING SECTION
AND THE CLIMATE SYSTEM
H
The volume of the pressure expan-
sion vessel (CM1) is 10 litres and it
is pre-pressurised as standard to 0.5
bar (5 mvp). As a result, the maxim-
um permitted height “H” between
the expansion vessel and the highest
installed radiator is 5 m, see figure.
If the pre-pressure is not high
enough, it can be increased by
adding air via the valve in the expan-
sion vessel. The expansion vessel’s
pre-pressure must be stated in the inspection document.
Any change in the pre-pressure affects the ability of the
expansion vessel to handle the expansion of the water.
The maximum system volume, excluding the heating
section, is 260 litres at the above pre-pressure.
15Chapter 4 | Pipe and ventilation connectionsNIBE F750
4 Pipe and ventilation
connections

SYSTEM DIAGRAM
F750 consists of a heat pump, water heater, buffer
vessel, immersion heater, fan, circulation pump and
control system.F750 is connected to the ventilation
system and heating medium circuits.
When the exhaust air at room temperature passes
through the evaporator, the refrigerant evaporates be-
cause of its low boiling point. In this way the energy in
the room air is transferred to the refrigerant.
The refrigerant is then compressed in a compressor,
causing the temperature to rise considerably.
The warm refrigerant is led to the condenser. Here the
refrigerant gives off its energy to the heating system
water, whereupon the refrigerant changes state from
gas to liquid.
The refrigerant then goes via filters to the expansion
valve, where the pressure and temperature are reduced.
The refrigerant has now completed its circulation and
returns to the evaporator.
FrånluftAvluft
Extract air Exhaust air
XL4 XL1XL2XL3
Connection, heating medium flowXL1
Connection, heating medium returnXL2
Connection, cold waterXL3
Connection, hot waterXL4
Caution
This is a principle of operation, differences may
occur in the installation in question.
Dimensions and pipe
connections
B
C
A
COPPER
LEK
F750
WM1XL4 XL3XL2 XL1XL5
STAINLESS
LEK
F750
XL4 XL3XL2 WM1 XL1XL5
NIBE F750Chapter 4 | Pipe and ventilation connections16

The overflow cup (WM1) can be turned, so that the pipe
can be directed forwards or backwards to simplify con-
nection of the hose to the drain.
SETTING OUT DIMENSIONS
Copper
CBAConnection
55235150(mm)XL1 Heating medium supply
360270165(mm)XL2 Heating medium return
280470230(mm)XL3 Cold water
315410225(mm)XL4 Hot water
310265240(mm)XL5 Hot water circulation
100340140(mm)WM1 Overflow cup
Stainless
CBAConnection
55235150(mm)XL1 Heating medium supply
360270165(mm)XL2 Heating medium return
280470230(mm)XL3 Cold water
315410130(mm)XL4 Hot water
310265240(mm)XL5 Hot water circulation
100340140(mm)WM1 Overflow cup
PIPE DIMENSIONS
Connection
22(mm)XL1-XL2 Heating medium ext Ø
22(mm)XL3 Cold water ext Ø
22(mm)XL4 Hot water ext Ø
15(mm)XL5 Hot water circulation ext. Ø
32(mm)WM2 Overflow water discharge
17Chapter 4 | Pipe and ventilation connectionsNIBE F750

Symbol key
MeaningSymbol
Shut-off valve
Non-return valve
Mixing valve
Shunt / shuttle valve
Safety valve
Temperature sensor
Circulation pump
Particle filter
Radiator system
Domestic hot water
Under floor heating systems
Cold and hot water
CONNECTING COLD AND HOT WATER
• A mixer valve must also be installed, if the factory
setting for hot water is changed. National regulations
must be observed.
• The setting for hot water is made in menu 5.1.1 (page
47).
XL4 XL3
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 F750 and
for example radiators, under floor heating/cooling, fan
coils etc.
• Install the enclosed filterballs as illustrated.
• 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.
XL2 XL1
NIBE F750Chapter 4 | Pipe and ventilation connections18

Installation alternative
F750 can be installed 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 59 for a list of the accessories that can
be used with F750.
SEPARATED/ONE UNIT
F750 is delivered as one unit and can be installed as one
unit or separated. For separate installation the accessory
DKI 10 is required.
The images in this manual show F750 installed as one
unit.
LEK
Separated installationOne unit
EXTRA HOT WATER HEATERS
The heat pump should be supplemented with an extra
water heater, if a large bath tub or other significant
consumer of hot water is installed.
Water heater without immersion heater
In water heaters without an immersion heater, the water
is heated by the heat pump's compressor. The water
heater is best positioned to the left of F750.
kv
vv
cw
hw
Water heater with immersion heater
If it is possible to use a water heater with an immersion
heater, NIBE COMPACT or EMINENT type water heaters
can be used.
If the valve connector is to be installed externally, moved
out or separated, it must be replaced with a separable
connector Ø 22 mm.
HW from F750
19Chapter 4 | Pipe and ventilation connectionsNIBE F750

HOT WATER CIRCULATION (VVC)
To reduce the risk of bacterial growth in systems with
hot water circulation, the temperature of the circulating
water should not fall below 50°C. Nor should there be
any hot water pipes containing stationary water. Adjust
the hot water system so that the temperature does not
fall below 50°C at the extremities of the system.
The circulation pump for hot water circulation can be
controlled by the heat pump. The HWC return can be
connected to XL5 or a freestanding water heater. If an
electric water heater is connected after the heat pump,
the HWC return must be connected to the water heater.
EXTRA CLIMATE SYSTEM
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.
NIBE F750Chapter 4 | Pipe and ventilation connections20