Nibe AXC 40 User guide

Installer Manual
Accessory card
IHB EN 1934-9
031444
AXC 40
LEK
S1155/S1255/VVM S320/VVM S325
F1145/F1155/F1245/F1255/VVM 225/VVM 320/VVM 325

41 Important information
4Safety information
4Symbols
4Marking
52 General
5Contents
5Compatible products
5Mounting
6Component placing AXC module (AA25)
73 Common electrical connection
7Cable lock
7Connecting communication
8Power connection
94 Shunt controlled additional heat
9General
9Pipe connections
10Outline diagram
10Electrical connection
12Program settings
13Electrical circuit diagram
145 Step controlled additional heat
14General
14Pipe connections
15Outline diagram
16Electrical connection
17Program settings
19Electrical circuit diagram
206 Hot water comfort
20General
20Pipe connections
21Outline diagram
21Electrical connection
23Program settings
24Electrical circuit diagram
257 Ground water system
25General
25Pipe connections
25Outline diagram
26Electrical connection
27Program settings
28Electrical circuit diagram
298 Technical data
29Technical specifications
59Contact information
3Chapter |AXC 40
S1155/S1255/VVM S320/VVM S325
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 2019.
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
equipment.
IP21
Danger to person or machine.
!
Read the Installer Manual.
AXC 40Chapter 1 | Important information4
Important information

This accessory, which includes a freestanding electric
control module, is used to allow connection and control
of the following accessory functions. An AXC 40 is re-
quired for each function.
• shunt-controlled additional heat
• step-controlled additional heat
• control of circulation pump for hot water circulation
• controlling ground water pump
Contents
Cable ties4 x
Heating pipe paste2 x
Insulation tape1 x
AXC module1 x
Aluminium tape2 x
Temperature sensor2 x
Compatible products
AXC 40 is suitable for the following main products:
• S1155
• S1255
• VVM S320
• VVM S325
Mounting
Caution
The screw type must be adapted to the surface
on which installation is taking place.
UN
Use all mounting points and install the module upright,
flat against the wall, with no part of the module protrud-
ing beyond the wall.
Leave at least 100 mm of free space around the module
to allow access and make cable routing easier during
installation and servicing.
NOTE
The installation must be carried out in such a
way that IP21 is satisfied.
5Chapter 2 | GeneralAXC 40
General

Component placing
AXC module (AA25)
AA5-X4 AA5-S2
AA5-X2
AA5
AA25-X1
AA5-X9
AA25-FC1
ELECTRICAL COMPONENTS
Accessory cardAA5
DIP switchAA5-S2
Terminal block, inputsAA5-X2
Terminal block, communicationAA5-X4
Terminal block, outputsAA5-X9
Miniature circuit-breakerAA25-FC1
Terminal block, power supplyAA25-X1
Designations according to standard EN 81346-2.
AXC 40Chapter 2 | General6

NOTE
All electrical connections must be carried out
by an authorised electrician.
Electrical installation and wiring must be carried
out in accordance with the stipulations in force.
The main product must be disconnected from
the power supply when installing AXC 40.
• To prevent interference, sensor cables to external
connections must not be laid close to high voltage
cables.
• The minimum area of communication and sensor
cables to external connections must be 0.5 mm² up
to 50 m, for example EKKX, LiYY or equivalent.
• AXC 40 must be installed via an isolator switch. The
cable area has to be dimensioned based on the fuse
rating used.
• Mark the relevant electrical cabinet with a warning
about external voltage, in those cases where a com-
ponent in the cabinet has a separate supply.
• AXC 40 restarts after a power failure.
Electrical circuit diagrams are at the end of the chapter
for each connection option.
Cable lock
Use a suitable tool to release/lock cables in terminal
blocks.
LEK
1
1
2
2
3
3
1
2
3
3
4
1
2
LEK
1
1
2
2
3
3
1
2
3
3
4
1
2
1
2
Connecting
communication
This accessory contains an accessory board (AA5) that
is connected directly to the main product’s input board
(terminal block AA2-X30).
The first accessory board is connected directly to the
main product’s terminal block AA2-X30. The following
boards are connected in series with the previous board.
B A GND
+12V
AA2-X30
1234
AA5-X4
1
2
3
4
5
6
7
8
A
B
GND
A
B
GND
AA5-X4
1
2
3
4
5
6
7
8
A
B
GND
A
B
GND
S1155/S1255
VVM S320/VVM S325
Accessory 1
Accessory 2
The terminal block (AA2-X30) is upright on S1155.
7Chapter 3 | Common electrical connectionAXC 40
Common electrical connection

Power connection
Connect the power supply cable to terminal block AA25-
X1 as illustrated.
Tightening torque: 0.5-0.6 Nm.
AA25-X1
2
1
N
L
Externt ProduktNamn
AXC40External
AXC 40Chapter 3 | Common electrical connection8

General
This function enables an external additional heater, e.g.
an electric boiler, wood boiler, pellet boiler, oil boiler,
gas boiler or district heating, to assist with the heating.
The heat pump/indoor module controls a shunt valve
(QN11) and a circulation pump (GP10) via AXC 40. If the
heat pump/indoor module cannot manage to maintain
the correct supply temperature (BT25), the additional
heat starts. When the temperature on the boiler sensor
(BT52) exceeds the set value, the heat pump transmits
a signal to the shunt (QN11) to open from the additional
heat. The shunt (QN11) is regulated so that the true
supply temperature agrees with the heat pump’s theor-
etically calculated set point value. When the heating
demand drops sufficiently, so additional heat is no longer
required, the shunt (QN11) closes completely.
Factory-set minimum operating time for the boiler is 12
hours.
The function smart energy source can be selected if you
want to prioritise automatically between heat pump
operation and additional heat versus the best price or
environmental impact.
COMPATIBLE PRODUCTS
• S1155
• S1255
• VVM S320
• VVM S325
Pipe connections
The external circulation pump (GP10) is located on the
supply line to the climate system after the temperature
sensor (BT25).
SHUNT VALVE
The shunt valve (QN11) must be placed on the supply
line to the climate system after the heat pump according
to the outline diagram.
AB
B
A
• Connect the supply line from the
heat pump to the external heat
source via the T-pipe to port B on
the shunt valve (closes on reduce
signal).
• Connect the supply line to the climate system from
the shunt valve to the common port AB (always open)
• Connect the supply line from the external additional
heat to the shunt valve to port A (opens on increase
signal).
9Chapter 4 | Shunt controlled additional heatAXC 40
Shunt controlled additional heat

TEMPERATURE SENSOR
• Install the boiler sensor (BT52) in a suitable location
in the external additional heat.
•External supply temperature sensor (BT25, connected
in the heat pump/indoor module) must be installed on
the supply line to the climate system, after the shunt
valve (QN11).
LEK
LEK
E
Install the temperature sensors using cable ties, together
with the heat conducting paste and aluminium tape.
Then insulate with the enclosed insulation tape.
NOTE
Sensor and communication cables must not
be laid near power cables.
Outline diagram
Real installations must be planned according to applic-
able standards. More system principles can be found at
nibe.eu.
EXPLANATION
Mixing valve controlled additional heat,
boiler
EM1
AXC 40AA25
Boiler sensorBT52
External circulation pumpGP10
Mixing valve, additionQN11
Heat pumpEB100
External supply temperature sensorBT25
External return line sensorBT71
Miscellaneous
Non-return valveRM5
-AA25-GP10
-EB100
-BT25
-RM5
-EB100
-EM1-QN11
-EM1-BT52
-EM1-AA25
-EM1
-EM1
-EB100-BT71
Electrical connection
NOTE
Read section "Common electrical connection"
for instructions regarding electrical connection.
OVERVIEW ACCESSORY BOARD (AA5)
ON
1 2 3 4 5 6
1
2
3
4
5
6
7 8
-X9
-X2
2420 21 22 2315 16 17 18 19
10
11
12 13 14
5 6 7 8 91
1
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
92 3 4
-X8
-S2
-X4
-X10
-X1
N
L
PE
PE
AA5-S2AA5-X2AA5-X9
CONNECTION OF SENSORS AND EXTERNAL
BLOCKING
Use cable type LiYY, EKKX or similar.
Boiler sensor (BT52)
Connect the boiler sensor to AA5-X2:23-24.
External blocking (optional)
An external switch function (NO) can be connected to
AA5-X2:21-22 to block additional heat. The switch must
be potential-free and a closed switch results in blocking.
AXC-kort
Externt
2423222120
AA5-X2
BT52
External blocking
External blocking
AXC40
External
External supply temperature sensor (BT25) /
return sensor (BT71)
The sensors (BT25) and (BT71) must be connected to
the main product’s soft inputs/outputs.
See the Installer Manual for the main product.
When the sensor is connected, the correct function
must be selected for the input/output in menu 7.4.
AXC 40Chapter 4 | Shunt controlled additional heat10

Caution
The relay outputs on the accessory board can
have a max load of 2A (230V) in total.
CONNECTION OF THE CIRCULATION PUMP
(GP10)
.
Connect the circulation pump (GP10) to AA5-X9:8 (230V),
AA5-X9:7 (N) and AA25-X1:3 (PE).
2
1
6
7
8
9
PE
N
L
Externt Produktnamn
GP10 AA5-X9
AA25-X1
M1
AA5-X9
AXC40External
AA25-X1
GP10
CONNECTION OF THE SHUNT VALVE
MOTOR (QN11)
Connect the shunt motor (QN11) to AA5-X9:6 (230V,
open), AA5-X9:5 (N) and AA5-X9:4 (230V, close).
6
5
4
3
7
NN
Externt Produktnamn
QN11 AA5-X9
St ng
Öppna
M1
AA5-X9
AXC40External
QN11
Open
Close
NN
Connection of 0-10 V control of shunt motor
(QN11)
Connect a twin core cable of the type LiKK, EKKX or
equivalent to AA5-X2:5 (0-10 V) and AA5-X2:6 (GND).
65
47
AA5-X2
0-10V
GND
AA5-X2
AXC40
External
At 0 V the shunt is closed and at 10 V the shunt is open.
CONNECTION OF THE AUXILIARY RELAY
FOR ADDITIONAL HEATING
Connect the auxiliary relay for switching the additional
heat on and off to AA5-X9:2 (230V) and AA5-X9:3 (N).
AA5-X9
Externt Produktnamn
L
N
3
2
1
4
Tillsats-
v rme
Externt hj lprel
A1 A2
AA5-X9
AXC40
External
External auxiliary relay
Additional
heat
DIP SWITCH
The DIP switch (S2) on the accessory card (AA5) must
be set as follows.
32
1
ON
476
58
11Chapter 4 | Shunt controlled additional heatAXC 40

Program settings
Program setting of AXC 40 can be performed via the
start guide or directly in the menu system.
Start guide
The start guide appears at first start-up after the heat
pump installation, but can also be found in menu 7.7.
MENU SYSTEM
If you do not make all settings via the start guide or need
to change any of the settings, this can be done in the
menu system.
Menu 7.2.1 - Add/remove accessories
Here, you state which accessories are installed for the
compatible product.
To automatically identify connected accessories, select
"Search for accessories". It is also possible to select ac-
cessories manually from the list.
Menu 7.2.3 - Shunt-controlled additional heat
(AXC)
prioritised additional heat
Setting range: on/off
start additional heat
Setting range: -2000 – -30 DM
minimum running time
Setting range: 0 – 48 h
min temp.
Setting range: 5 – 90 °C
mixing valve amplifier
Setting range: 0.1 –10.0
mixing valve step delay
Setting range: 10 – 300 s
Set when the addition is to start, the minimum run time
and the minimum temperature for external addition with
shunt here. External addition with shunt is for example
a wood/oil/gas/pellet boiler.
You can set shunt valve amplification and shunt valve
waiting time.
Selecting "prioritised additional heat" uses the heat from
the external additional heat instead of the heat pump.
The shunt valve is regulated as long as heat is available,
otherwise the shunt valve is closed.
See the accessory installation instructions for function
description.
Menu 7.5.3 - Forced control
Here you can force control the various components in
the installation. The most important safety functions
remain active however.
NOTE
Forced control is only intended to be used for
troubleshooting purposes. Using the function
in any other way may cause damage to the
components in your climate system.
Menu 4.6 - Smart Energy Source™
Smart energy source™
Alternative: on/off
Control method
Alternative: Price / CO2
Year Smart Energy Source™ activated AXC 40 prioritises
how / to what extent each docked energy source will
be used. Here you can select whether the system will
use the energy source that is cheapest at the time or
the one that is most carbon dioxide neutral at the time.
Caution
Also see the Installer Manual for the main
product.
AXC 40Chapter 4 | Shunt controlled additional heat12

Electrical circuit diagram
Part Specification Sheet 051055-8
Page 2/2 Created:2018-10-22 10:18
WIRING DIAGRAM SHUNT CONTROL ELSCHEMA SHUNTSTYRD
051055 8
13Chapter 4 | Shunt controlled additional heatAXC 40

General
This function enables an external additional heater, e.g.
an electric boiler, to aid with heating.
With AXC 40, three potential-free relays can be used for
additional heat control, which then gives max. 3 linear
or 7 binary steps.
The flow through the addition is ensured either by the
charge pump (GP12)) or the external circulation pump
(GP10).
COMPATIBLE PRODUCTS
• S1155
• S1255
• VVM S320
• VVM S325
Pipe connections
The external circulation pump (GP10) is located on the
supply line to the climate system after the temperature
sensor (BT25).
If the climate system’s flow exceeds the maximum re-
commended flow for the electric boiler, a bypass must
be installed so that only a partial flow passes through
the electric boiler.
TEMPERATURE SENSOR
•External supply temperature sensor (BT25, connected
in the heat pump/indoor module), must be installed
on the supply line to the climate system, after the
additional heat.
LEK
LEK
E
Install the temperature sensors using cable ties, together
with the heat conducting paste and aluminium tape.
Then insulate with the enclosed insulation tape.
NOTE
Sensor and communication cables must not
be laid near power cables.
AXC 40Chapter 5 | Step controlled additional heat14
Step controlled additional heat

Outline diagram
Real installations must be planned according to applic-
able standards. More system principles can be found at
nibe.eu.
EXPLANATION
Step controlled additional heatEB1
AXC 40AA25
Circulation pump, heating medium externalGP10
Heat pumpEB100
External supply temperature sensorBT25
External return line sensorBT71
Miscellaneous
Shut-off valveQM42-43
Trim valveRN11
Non-return valveRM21
-EB1-GP10
-EB100-BT25
-EB100
-RN11
-QM42
-QM43 -RM21
-EB1-AA25
-EB1
-EB1
-EB100-BT71
15Chapter 5 | Step controlled additional heatAXC 40

Electrical connection
NOTE
Read section "Common electrical connection"
for instructions regarding electrical connection.
OVERVIEW ACCESSORY BOARD (AA5)
ON
1 2 3 4 5 6
1
2
3
4
5
6
7 8
-X9
-X2
2420 21 22 2315 16 17 18 19
10
11
12 13 14
5 6 7 8 91
1
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
92 3 4
-X8
-S2
-X4
-X10
-X1
N
L
PE
PE
AA5-S2AA5-X2AA5-X9
CONNECTION OF SENSORS AND EXTERNAL
BLOCKING
Use cable type LiYY, EKKX or similar.
External blocking (optional)
A contact (NO) can be connected to AA5-X2:23-24 to
block the additional heat. When the contact closes, the
additional heat is blocked.
AXC-kort
Externt
2423222120
AA5-X2
AXC40
External
External supply temperature sensor (BT25) /
return sensor (BT71)
The sensors (BT25) and (BT71) must be connected to
the main product’s soft inputs/outputs.
See the Installer Manual for the main product.
When the sensor is connected, the correct function
must be selected for the input/output in menu 7.4.
Caution
The relay outputs on the accessory board can
have a max load of 2A (230V) in total.
CONNECTION OF THE CIRCULATION PUMP
(GP10)
Connect the circulation pump (GP10) to AA5-X9:8 (230V),
AA5-X9:7 (N) and AA25-X1:3 (PE).
.
2
1
6
7
8
9
PE
N
L
Externt Produktnamn
GP10 AA5-X9
AA25-X1
M1
AA5-X9
AXC40External
AA25-X1
GP10
CONNECTION OF RELAYS
Connecting additional step
Connect step 1 to AA5-X9:1 and 2.
Connect step 2 to AA5-X9:3 and 4.
Connect step 3 to AA5-X9:5 and 6.
1
2
3
4
5
6
7
AA5-X9
Externt Produktnamn
Steg 1
Steg 2
Steg 3
A2 A1
A2 A1
A2 A1
AA5-X9
AXC40External
Step 1
Step 3
Step 2
Connection of 0-10 V control
Connect a twin core cable of the type LiKK, EKKX or
equivalent to AA5-X2:5 (0-10 V) and AA5-X2:6 (GND).
65
47
AA5-X2
0-10V
GND
AA5-X2
AXC40
External
0 V = 0 steps and 10 V = max. number of set steps.
DIP SWITCH
The DIP switch (S2) on the accessory card (AA5) must
be set as follows.
AXC 40Chapter 5 | Step controlled additional heat16

32
1
ON
476
58
Program settings
Program setting of AXC 40 can be performed via the
start guide or directly in the menu system.
START GUIDE
The start guide appears upon first start-up after the heat
pump installation, but is also found in menu 7.7.
MENU SYSTEM
If you do not make all settings via the start guide or need
to change any of the settings, this can be done in the
menu system.
Menu 7.2.1 - Add/remove accessories
Here, you state which accessories are installed for the
compatible product.
To automatically identify connected accessories, select
"Search for accessories". It is also possible to select ac-
cessories manually from the list.
Menu 7.2.6 - Step-controlled additional heat
(AXC)
start diff additional heat
Setting range: -2000 – -30 DM
diff. between additional steps
Setting range: 0 – 1,000 DM
max step
Setting range
(binary stepping deactivated): 0 – 3
Setting range
(binary stepping activated): 0 – 7
binary stepping
Setting range: on/off
Make settings for step controlled addition here. Step
controlled addition is for example an external electric
boiler.
It is possible, for example, to select when the additional
heat is to start, to set the maximum number of permit-
ted steps and whether binary stepping is to be used.
When binary stepping is deactivated (off), the settings
refer to linear stepping.
See the accessory installation instructions for function
description.
Menu 7.5.3 - Forced control
Here you can force control the various components in
the installation. The most important safety functions
remain active however.
17Chapter 5 | Step controlled additional heatAXC 40

NOTE
Forced control is only intended to be used for
troubleshooting purposes. Using the function
in any other way may cause damage to the
components in your climate system.
Caution
Also see the Installer Manual for the main
product.
AXC 40Chapter 5 | Step controlled additional heat18

Electrical circuit diagram
WIR. DIAGRAM STEP CONTROLLED ELSCHEMA STEGSTYRD TILLSATS
051056 8
19Chapter 5 | Step controlled additional heatAXC 40

General
This function provides the opportunity to control addi-
tional heat in the tank, mixing valve and hot water circu-
lation.
ADDITIONAL HEAT IN TANK
If an immersion heater is installed in the tank, it can be
permitted to produce hot water at the same time as the
heat pump prioritises heating.
MIXING VALVE
A temperature sensor reads the temperature of the
outgoing hot water to the domestic hot water and ad-
justs the mixing valve from the water heater until the
set temperature has been reached.
HOT WATER CIRCULATION (VVC)
One pump can be controlled for the circulation of the
hot water during selectable periods.
COMPATIBLE PRODUCTS
• S1155
• S1255
• VVM S320
• VVM S325
Pipe connections
MIXING VALVE
The mixer valve (FQ3) must be placed on the outgoing
hot water line from the water heater according to the
outline diagram.
AB
A
B
•Connect the incoming cold water via
the T-pipe to port B on the mixer
valve (closes at signal).
• Connect the mixed water to the do-
mestic hot water taps from the mix-
er valve to the common port AB (always open).
•Connect the outgoing hot water from the water heater
to the mixer valve to port A (opens on signal)
TEMPERATURE SENSOR
• Temperature sensor, outgoing hot water, (BT70) is
installed as close to the mixing valve (FQ3) as possible.
LEK
LEK
E
Install the temperature sensors using cable ties, together
with the heat conducting paste and aluminium tape.
Then insulate with the enclosed insulation tape.
NOTE
Sensor and communication cables must not
be laid near power cables.
AXC 40Chapter 6 | Hot water comfort20
Hot water comfort