Nibe F750 User guide

Installer manual
LEK
NIBE F750
Exhaust air heat pump
IHB GB 1702-4
331467

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 34.
How to scroll through menus and make different settings is described on page 36.
Set the indoor climate
2X
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.

Table of Contents
41 Important information
4Safety information
4General
62 Delivery and handling
6Transport
6Assembly
7Supplied components
8Removing the covers
8Removing parts of the insulation
103 The heat pump design
10
12
134 Pipe and ventilation connections
13General pipe connections
14Dimensions and pipe connections
16Symbol key
16Cold and hot water
16Heating medium side
17Installation alternative
19General ventilation connection
19Ventilation flow
19Adjusting ventilation
205 Electrical connections
20General
22Connections
24Settings
26Optional connections
29Connecting accessories
306 Commissioning and adjusting
30Preparations
30Filling and venting
31Start-up and inspection
347 Control - Introduction
34Display unit
35Menu system
388 Control - Menus
38Menu 1 - INDOOR CLIMATE
38Menu 2 - HOT WATER
38Menu 3 - INFO
39Menu 4 - HEAT PUMP
40Menu 5 - SERVICE
459 Service
45Maintenance
45Service actions
4910 Disturbances in comfort
49Info-menu
49Manage alarm
49Troubleshooting
5111 Accessories
5312 Technical data
53Dimensions and setting-out coordinates
55Technical specifications
59Energy labelling
61Electrical circuit diagram
73Item register
75Contact information
3Table of Contents |NIBE F750

Safety information
This manual describes installation and service procedures
for implementation by specialists.
This appliance can be used by children
aged from 8 years and above and per-
sons with reduced physical, sensory or
mental capabilities or lack of experience
and knowledge if they have been given
supervision or instruction concerning use
of the appliance in a safe way and under-
stand 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 2016.
Symbols
NOTE
This symbol indicates danger to machine or
person.
Caution
This symbol indicates important information
about what you should observe when maintain-
ing your installation.
TIP
This symbol indicates tips on how to facilitate
using the product.
Marking
F750 is CE marked and fulfils IP21.
The CE marking means that NIBE ensures that the
product meets all regulations that are placed on it based
on relevant EU directives. The CE mark is obligatory for
most products sold in the EU, regardless where they are
made.
IP21 means that objects with a diameter larger than or
equivalent to 12.5 mm cannot penetrate and cause
damage and that the product is protected against vertic-
ally falling drops of water.
General
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 legis-
lation.
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.
Country specific information
Installer manual
This installer manual must be left with the customer.
NIBE F750Chapter 1 | Important information4
1 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
✔
Ventilation (page 19)
Setting the ventilation flow
Heating medium (page 16)
System flushed
System vented
Safety valve
Circulation pump setting
Setting heating medium flow
Boiler pressure
Hot water (page 16)
Mixing valve
Safety valve
Electricity (page 20)
Connections
Main voltage
Phase voltage
Fuses heat pump
Fuses property
Outside sensor
Room sensor
Current sensor
Safety breaker
Earth circuit-breaker
5Chapter 1 | Important informationNIBE F750

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.
30 - 50 mm
30 - 50 mm
15 - 40 mm
20-55 mm
■Because water comes from F750, the floor coating is
important. A waterproof floor or floor membrane is
recommended.
■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.
NIBE F750Chapter 2 | Delivery and handling6
2 Delivery and handling

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 F750
can be carried out from the front. Leave free space
between the heat pump and the wall behind (and for
any routing of cables and pipes). The back of the heat
pump must never be installed directly against a wall. It
is recommended that space of at least 10 mm is left to
reduce the risk of noise and any propagation of vibration.
800
10-50* 10-50*
min. 10 (rekommendation)
min. 10 (recommendation)
* Depending on whether the panels can be removed or not.
NOTE
Ensure that there is sufficient space (300 mm)
above the heat pump for installing ventilation
hoses.
Supplied components
Room sensorOutside sensor
LEK
Vent hose
(length 4 m)
Extra air filter
LEK
LEK
LEK
DCO 10, vent socket (only
F750 copper)
Current sensor
Shut off valve with filter
Location
The kit of supplied items is placed on top of the product.
7Chapter 2 | Delivery and handlingNIBE F750

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 installa-
tion.
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
Insulation, immersion heater
NOTE
Electrical installation and service must be carried
out under the supervision of a qualified electri-
cian. 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 21.
NIBE F750Chapter 2 | Delivery and handling8

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 21).
9Chapter 2 | Delivery and handlingNIBE F750

F750, copper
LEK
LEK
LEK / APH
EP2BT15
BP2
HZ2 BT12
GP6
QN10
AA1
FA1
BT21BT3
BT16
EP1
UB1
UB2
BT7
BT63
FL1
UR1QM24GQ2BT14BP1
PF1
PF3
EB1
XL1
QM22
AA2
BT6
AA3
AA4
AA4-XJ3
AA4-XJ4
SF1
QN1
BT17
BS1
BT20
QM23
BT61
WM2
WM1
AA101
FL6
QM10
BT62 RM1XL5
BT30
FD1
RF3
RA2
AA23
W130
LEK
CA1
QA40
RA1
XL31
XL32
XL2 GP1 XL4 XL3 QM11
BP5
WP3
FL2
QM20 WP1 WP2CM1 XL10
QM31
GQ10
NIBE F750Chapter 3 | The heat pump design10
3 The heat pump design

F750, stainless steel
LEK
LEK
LEK
LEK / APH
EP2BT15
BP2
HZ2 BT12
QN10
AA1
FA1
BT21BT3
BT7
BT63
QM24GQ2BT14BP1
PF1
PF3
EB1
AA101
BT30
FD1
GP1 XL3
XL2 QM11
QM13
RF3
RA2
AA2
BT6
AA23
AA3
AA4-XJ3
AA4-XJ4
SF1
AA4
UB2
UB1
BT16
EP1
QN1
BT20
BT17
BS1
UR1
W130
CA1
QA40
RA1
XL31
XL32
WM2
WM1
FL1
FL6
QM10
XL1
XL4
BT62
FQ1
QM22QM23 QM20 CM1 XL10
BT61
QM31
BP5
WP3
FL2
WP1 WP2
GP6RM1XL5
LEK
BF1
GQ10
11Chapter 3 | The heat pump designNIBE F750

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
Ventilation connection, exhaust airXL31
Ventilation connection, extract airXL32
HVAC components
Expansion vesselCM1
Safety valve, water heaterFL1
Safety valve, climate systemFL2
Vacuum valveFL6
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
Venting, heat exchangerQM24
Shut-off valve, heating medium flowQM31
Shuttle valve, climate system/water heaterQN10
Reversing valve, circulation climate system1 QN27
Non-return valveRM1
Overflow water containerWM1
Overflow water dischargeWM2
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
High pressure pressostatBP1
Low pressure pressostatBP2
Pressure gauge, heating systemBP5
Air speed sensorBS1
Outside sensor1 BT1
Temperature sensors, heating medium returnBT3
Temperature sensor, hot water, controlBT6
Temperature sensor, hot water, displayBT7
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
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 unitAA4
AA4-XJ3 USB socket
AA4-XJ4 Service socket
Communication boardAA23
Connection card sensorAA101
CapacitorCA1
Immersion heaterEB1
Miniature circuit-breakerFA1
Temperature limiterFD1
InverterQA40
ChokeRA1
ChokeRA2
EMC cardRF3
SwitchSF1
Network cable for NIBE UplinkTM W130
Cooling components
EvaporatorEP1
CondenserEP2
CompressorGQ10
Drying filterHZ2
Expansion valveQN1
Ventilation
Exhaust air fanGQ2
Exhaust air filter1 HQ10
Filter cover, exhaust airUR1
Miscellaneous
Rating platePF1
Serial number platePF3
Cable glandUB1
Cable glandUB2
1Not visible in the image
3Only heat pumps with stainless steel vessel.
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
NIBE F750Chapter 3 | The heat pump design12

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 goes via overflow cup 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 before
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 supple-
ment with an extra water filter.
Maximum boiler and radiator volumes
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 vessel and the highest radiator
is 5 m, see figure.
If the standard initial pressure in the
pressure vessel is not high enough
it can be increased by adding air via
the valve in the expansion vessel.
The initial pressure of the expansion
vessel must be stated in the inspec-
tion document. Any change in the
initial pressure affects the ability of the expansion vessel
to handle the expansion of the water.
The maximum system volume excluding the boiler is 260
litres at the above pre-pressure.
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 an outline diagram, differences may occur
in the actual installation.
13Chapter 4 | Pipe and ventilation connectionsNIBE F750
4 Pipe and ventilation connections

Dimensions and pipe
connections
B
C
A
Copper
LEK
F750
WM1XL4 XL3XL2 XL1
Stainless
LEK
F750
WM1XL4 XL3XL2 XL1
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.
NIBE F750Chapter 4 | Pipe and ventilation connections14

Setting out dimensions
CBAConnection, copper
55235150(mm)XL1 Heating medium sup-
ply
360270165(mm)XL2 Heating medium re-
turn
280470230(mm)XL3 Cold water
315410225(mm)XL4 Hot water
100340140(mm)WM1 Overflow cup
CBAConnection, stainless
steel
55235150(mm)XL1 Heating medium sup-
ply
360270165(mm)XL2 Heating medium re-
turn
280470230(mm)XL3 Cold water
315410130(mm)XL4 Hot water
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
32(mm)WM2 Overflow water discharge
15Chapter 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 set-
ting for hot water is changed. National regulations
must be observed.
■The setting for hot water is made in menu 5.1.1 (page
41).
XL4 XL3
Heating medium side
Connecting the climate system
A climate system is a system that regulates indoor com-
fort with the help of the control system in F750 and for
example radiators, under floor heating/cooling, fan coils
etc.
■When connecting to a system with thermostats on all
radiators, either a bypass valve must be fitted or some
of the thermostats must be removed to ensure suffi-
cient flow. A particle filter must be installed on the re-
turn line.
XL2 XL1
NIBE F750Chapter 4 | Pipe and ventilation connections16

Installation alternative
F750 can be installed in several different ways, some of
which are shown below.
Further option information is available at www.nibe.eu
and in the respective assembly instructions for the ac-
cessories used. See page 51 for a list of the accessories
that can be used with F750.
More information about the options is available at
www.nibe.eu.
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 fromF750
17Chapter 4 | Pipe and ventilation connectionsNIBE F750

Connecting hot water circulation
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. There should not be
any non-circulatory hot water pipes. Adjust the hot water
system so that the temperature does not fall below 50
ｰ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.
Two or more climate systems
When more than one climate system is to be heated, the
following connection can be used.
The ECS 40/ECS 41 accessory is required for this connec-
tion.
NIBE F750Chapter 4 | Pipe and ventilation connections18

General ventilation connection
Ventilation installation must be carried out in accordance
with current norms and directives.
To prevent fan noise being transferred to the ventilation
devices, it may be a good idea to install a silencer in the
duct system. This is especially important if there are
ventilation devices in noise sensitive rooms.
Connections must be made via flexible hoses, which
should be installed so that they are easy to replace. The
extract air duct must be provided with diffusion-tight
insulation (PE30) over its entire length. Ensure that the
condensation insulation is sealed at any joints and/or at
lead-in nipples, silencers, roof cowls or similar. Provision
must be made for inspection and cleaning of the duct.
Make sure that there are no reductions of cross-sectional
area in the form of creases, tight bends etc., since this
will reduce the ventilation capacity. The air duct system
must be a minimum of air tightness class B. The extract
air duct must be a maximum of 20 m long with a maxim-
um of six bends. The ventilation ducts should be installed
in such a way that it is easy to open the inverter box. The
extract air duct should, if possible, be routed up through
the roof. If the duct is to be routed out through an ex-
ternal wall, avoid having a 90 degree bend backward,
as this can cause noise and poorer capacity.
NOTE
F750 has a very low extract air temperature. To
avoid damaging the product and/or the house,
it is therefore important that the extract air
ducts are insulated with diffusion-proof material
(PE30) along their entire length.
TIP
If additional condensation insulation (PE30) di-
mension Ø 200 is installed on the outside of the
existing exhaust line between the heat pump
and the inner roof, the noise in the installation
area is reduced by 1-2 dB(A).
Exhaust air duct /kitchen fan
Exhaust air duct (kitchen fan) must not be connected to
F750.
To prevent food vapour being transferred to F750 the
distance between the kitchen fan and the exhaust air
device must be considered. The distance should not be
less than 1.5 m, but this can vary between different in-
stallations.
Always use a kitchen fan when cooking.
NOTE
A duct in a masonry chimney stack must not be
used for extract air.
120
40
600
615
200
60
110
35
2075
440
25-50
370
350
440
180
LEK
Extract air Exhaust air
Ventilation flow
Connect F750 so that all exhaust air except kitchen duct
air (kitchen fan) passes the evaporator (EP1) in the heat
pump. The lowest ventilation flow must comply with the
applicable national standards. For optimum heat pump
performance, the ventilation flow should not be less
than 31 l/s (110 m³/h).
Ensure that the ventilation openings are not blocked.
Set the ventilation capacity in the heat pump's menu
system (menu 5.1.5).
If the exhaust air temperature falls below 16 °C, the
compressor is blocked and electric additional heat is
permitted. Heat is not recovered from the exhaust air
when the compressor is blocked.
Adjusting ventilation
To obtain the necessary air exchange in every room of
the house, the exhaust air devices must be correctly po-
sitioned and adjusted and the fan in the heat pump ad-
justed.
Immediately after installation adjust the ventilation so
that it is set according to the projected value of the
house.
Incorrect ventilation adjustment may lead to reduced
installation efficiency and thus poorer operating eco-
nomy, and may result in moisture damage to the house.
19Chapter 4 | Pipe and ventilation connectionsNIBE F750

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.
■F750 is not switchable between 3x230V and 3x400V.
■If the building is equipped with an earth-fault breaker,
F750 should be equipped with a separate one.
■If a miniature circuit breaker is used, this should have
at least motor characteristic “C”. See page 55 for fuse
size.
■For the heat pump wiring diagram, see page 61.
■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 F750, cable grommets UB1and
UB2, (marked in image) must be used. In UB1 and UB2
the cables are inserted through the heat pump from
the back to the front. For dimensions diagram see page
22.
LEK / APH
LEK
F750
UB1
UB2
NOTE
Switch (SF1) must not be moved to "" or " "
until F750 has been filled with water. Otherwise
the temperature limiter, thermostat and the
immersion heater may be damaged.
NOTE
Check the connections, main voltage and phase
voltage before the machine is started, to prevent
damage to the heat pump electronics.
NOTE
If the supply cable is damaged, only NIBE, its
service representative or similar authorised
person may replace it to prevent any danger
and damage.
NOTE
Electrical installation and service must be carried
out under the supervision of a qualified electri-
cian. Cut the current with the circuit breaker
before carrying out any servicing. Electrical in-
stallation and wiring must be carried out in ac-
cordance with the stipulations in force.
LEK
F750
FD1
FA1
FD1-S2
Miniature circuit breaker (FA1)
Operation (230V), fan, circulation pumps etc. are intern-
ally fused by a miniature circuit breaker (FA1).
Caution
Check the miniature circuit-breaker (FA1). It may
have tripped during transportation.
Temperature limiter (FD1)
The temperature limiter (FD1) cuts the current supply to
the electric additional heat if the temperature rises
between 90 and 100°C and can be manually reset.
Resetting
The temperature limiter (FD1) is accessible behind the
front cover. Reset the temperature limiter by carefully
pressing the button (FD1-SF2) using a small screwdriver.
NIBE F750Chapter 5 | Electrical connections20
5 Electrical connections