Nibe S Series User guide

Installer manual
HRV unit
NIBE ERS 20-300
LEK
IHB EN 2306-1
731436

S-series
S1255
F-series

41 Important information
4Safety information
4Symbols
4Serial number
4Recovery
5Inspection of the installation
62 Delivery and handling
6Transport and storage
6Supplied components
6Compatible products
6Removing the covers
7Assembly
7Mounting
83 Design of the HRV unit
9Pipe connections
9Sensors etc.
9Electrical components
9Ventilation
9Miscellaneous
104 Ventilation connections
10Condensation water drain
10General ventilation connections
10Ventilation flow
11Adjusting ventilation
11Ventilation connections
125 Electrical connection
12Overview accessory board (AA5)
12Supply
12Connecting to main product
146 Commissioning and adjusting
14Preparations
14Filling
14Start-up and inspection
157 Activating ERS 20
15Start guide
15Menu system
178 Disturbances in comfort
17Troubleshooting
189 Accessories
1910 Technical data
19Dimensions
20Technical specifications
21Energy labelling
22Electrical circuit diagram
43Contact information
3Chapter |NIBE ERS 20-300
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Table of Contents
S-series

Safety information
This manual describes installation and service procedures
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 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.
This is an original manual. It may not be
translated without the approval of NIBE.
Rights to make any design or technical
modifications are reserved.
©NIBE 2023.
If the supply cable is damaged, only NIBE,
its service representative or similar author-
ised person may replace it to prevent any
danger and damage.
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.
Serial number
The serial number can be found at the top left.
LEK
Serial number
LEK
Caution
You need the product's serial number for servicing
and support.
Recovery
Leave the disposal of the packaging to the installer
who installed the product or to special waste sta-
tions.
When disposing of the product, its constituent ma-
terials and components, e.g. compressors, fans, circulation
pumps and circuit boards, must be disposed of at a special
waste station or dealer who provides this type of service.
To access the separate components, refer to the section
that shows the construction of the product. No special tools
are required for access.
Improper disposal of the product by the user results in ad-
ministrative penalties in accordance with current legislation.
NIBE ERS 20-300Chapter 1 | Important information4
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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
✔
Electricity (page 12)
Connections
Main voltage
Fuses property
Earth circuit-breaker
5Chapter 1 | Important informationNIBE ERS 20-300
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Transport and storage
ERS 20 should be transported and stored in the dry.
Supplied components
2 x roof brackets
Compatible products
•SMO S40•VVM S320
•VVM S325
•S1155
•S1255
Removing the covers
1. Slacken off the four screws holding the side panel. Move
the panel out and downwards.
LEK
2. Unscrew all the screws holding the bottom panel.
LEK
3. Lift the bottom panel down.
LEK
NIBE ERS 20-300Chapter 2 | Delivery and handling6
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Delivery and handling

Assembly
ERS 20 is installed in the roof using the enclosed roof
brackets. Noise from the fans can be transmitted to the
brackets.
•Install ERS 20 on 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 adjoin-
ing a bedroom or other room where noise may be a prob-
lem.
•Wherever the unit is located, walls to sound sensitive
rooms should be fitted with sound insulation.
•Condensation water comes from the HRV unit. A condens-
ation outlet with a water seal must be installed and routed
to an internal drain.
•The HRV unit’s installation area always has to have a
temperature of at least 10 °C and max. 35 °C.
INSTALLATION AREA
Leave a free space of 1000 mm in front of the product.
Because servicing is carried out from below, a free space of
1,600 mm is recommended below the unit.
1000
NOTE
Ensure that there is sufficient space (300 mm) for
connecting ventilation ducts.
Mounting
When installing on a wooden roof, a vibration damper is re-
commended to prevent vibration being transferred.
1. Install the two enclosed roof mountings in the roof.
1205
2. Move ERS 20 into position.
LEK
3. Secure ERS 20 with screws.
7Chapter 2 | Delivery and handlingNIBE ERS 20-300
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LEK
LEK
GQ3
XL32 XL34
XL33 XL31AA5
GQ2 EP26
XL40
HQ10HQ11 QN37
W1W2PZ1
BT22BT20BT23
BT21
BL2
NIBE ERS 20-300Chapter 3 | Design of the HRV unit8
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Design of the HRV unit

Pipe connections
Ventilation connection, exhaust airXL31
Ventilation connection, extract airXL32
Ventilation connection, supply airXL33
Ventilation connection, outdoor airXL34
Condensation water drainXL40
Sensors etc.
Level monitorBL2
Temperature sensor, exhaust airBT20
Temperature sensor, extract airBT21
Temperature sensor, supply airBT22
Temperature sensor, outdoor airBT23
Electrical components
Accessory cardAA5
Cord with connection plugW101
Communication cableW102
Ventilation
Heat exchangerEP26
Exhaust air fanGQ2
Supply air fanGQ3
Exhaust air filterHQ10
Supply air filterHQ11
Bypass damperQN37
Miscellaneous
Type platePZ1
Designations according to standard EN 81346-2.
9Chapter 3 | Design of the HRV unitNIBE ERS 20-300
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Condensation water drain
ERS 20 can produce several litres of condensation water
per day. It is therefore important that the condensation
outlet is correctly executed and the HRV unit installed hori-
zontally.
Check that the water seal is airtight and firmly in position.
The connection must be made so that the user can check
and top up the water seal, without opening ERS 20.
The connection for the condensation outlet measures Ø15
mm.
CLEANINGTHECONDENSATIONWATERDRAIN
Condensation forms when ERS 20 is working. This condens-
ation is led off and collected in the condensation water drain.
Apart from water, a certain amount of dust and particles
also collect there.
Check regularly that the condensation water drain and any
floor drains are not blocked; water must be able to run
through freely. Clean, if necessary.
NOTE
During operation, negative pressure arises in the
HRV unit, which means that a water column of at
least 100 mm must be guaranteed in the water
seal.
100
General ventilation connections
•Ventilation installation must be carried out in accordance
with current norms and directives.
•Provision must be made for inspection and cleaning of
the duct.
•The air duct system must be a minimum of air tightness
class B.
•To prevent fan noise being transferred to the ventilation
devices, install silencers in suitable locations in the duct
system.
•The extract air and outdoor air ducts are insulated using
diffusion-proof material along their entire lengths.
•Ensure that the condensation insulation is fully sealed at
any joints and/or at lead-in nipples, silencers, roof cowls
or similar.
•The air must be routed to the outdoor air duct through an
outer wall grille in the facade. The outer wall grille must
be installed so that it is protected from the weather and
must be designed so that no rainwater and/or snow can
penetrate the facade or follow the air into the duct.
•When positioning the outdoor air and extract air
hood/grille, bear in mind that the two air flows must not
short circuit to prevent the extract air from being drawn
into ERS 20 again.
•A duct in a masonry chimney stack must not be used for
extract air or outdoor air.
NOTE
To ensure a sealed connection to ERS 20, nipples
must be used when connecting the air ducts.
EXHAUST AIR DUCT /KITCHEN FAN
Exhaust air duct (kitchen fan) must not be connected to
ERS 20.
To prevent cooking odours from being led to the ERS 20,
the distance between the kitchen fan and the exhaust air
valve must be taken into consideration. The distance must
not be less than 1.5 m, but may vary between different in-
stallations.
Always use a kitchen fan when cooking.
Ventilation flow
Connect ERS 20 so that all the exhaust air, except kitchen
duct air (kitchen fan), passes through the heat exchanger
(EP26) in the product.
The ventilation flow must comply with the applicable national
standards.
NIBE ERS 20-300Chapter 4 | Ventilation connections10
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Ventilation connections

The supply air flow must be lower than the exhaust air flow
to prevent over pressure in the house.
Set the ventilation capacity in the main product’s menu
system (menu 7.1.4 - "Ventilation").
Adjusting ventilation
To obtain the necessary air exchange in every room of the
building, the exhaust air valve and the supply air inlet as well
as the fans in the HRV unit must be correctly positioned and
adjusted.
Immediately after installation adjust the ventilation so that
it is set according to the projected value of the house.
Incorrect adjustment of the ventilation may lead to reduced
installation efficiency and thus poorer operating economy,
a poorer indoor climate and moisture damage in the building.
Ventilation connections
LEK
Exhaust air
Supply air
Extract air
Outdoor air
11Chapter 4 | Ventilation connectionsNIBE ERS 20-300
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NOTE
All electrical connections must be carried out by
an authorised electrician.
Electrical installation and wiring must be carried
out in accordance with national provisions.
ERS 20 must not be powered during installation.
NOTE
If the supply cable is damaged, only NIBE, its ser-
vice representative or similar authorised person
may replace it to prevent any danger and damage.
•To prevent interference, sensor cables to external connec-
tions 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.
For electrical wiring diagram, see page 22.
Overview accessory board (AA5)
ON
12345678
-X9
-X2
24 20212223 1516171819 1011121314 56789 1
1
N
L
PE
PE
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
9
234
-X8
-X4
-X10
-X1
AA5-S2
AA5-X4
Supply
ERS 20 is connected to a earthed single-phase wall socket
or a permanent installation. For permanent installations,
ERS 20 must be preceded by a circuit breaker with at least
a 3 mm breaking gap.
Connecting to main product
CONNECTING TO THE HEAT PUMP
ERS 20 contains an accessory board (AA5) that connects
directly to the main product’s PCB (terminal block AA2-X30).
The communication cable (W102) is connected to the access-
ory board (AA5) from the factory.
If several accessories are to be connected, or are already
installed, the boards are connected in series.
Because there can be different connections for accessories
with accessory board (AA5), you should always read the in-
structions in the manual for the accessory that is to be in-
stalled.
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
Main product
Accessory 1
Accessory 2
NIBE ERS 20-300Chapter 5 | Electrical connection12
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Electrical connection

CONNECTING TO CONTROL MODULE
ERS 20 contains an accessory board (AA5) that connects
directly to the control module on its joint board (terminal
block AA100-X9).
The communication cable (W102) is connected to the access-
ory board (AA5) from the factory.
If several accessories are to be connected, or are already
installed, the boards are connected in series.
Because there can be different connections for accessories
with accessory board (AA5), you should always read the in-
structions in the manual for the accessory that is to be in-
stalled.
+12V
GND
B
A
AA100-X9
7
8
9
10
11
12
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
Accessory 1
Accessory 2
Control module
DIP SWITCH
The DIP switch (S2) on the accessory board (AA5) must be
set as follows.
You can have up to 8 ERS 20 in the same installation, each
ERS 20 is given a unique setting.
N
12345678
ERS 20 no. 2
N
12345678
ERS 20 no. 1
N
12345678
ERS 20 no. 4
N
12345678
ERS 20 no. 3
N
12345678
ERS 20 no. 6
N
12345678
ERS 20 no. 5
N
12345678
ERS 20 no. 8
N
12345678
ERS 20 no. 7
13Chapter 5 | Electrical connectionNIBE ERS 20-300
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Preparations
•Check the miniature circuit-breaker (FC1) in the main
product. It may have tripped during transportation.
•Check that the air filters are clean, they can become dirty
after installation.
Filling
•Check that there is water in the water seal, fill if necessary.
Start-up and inspection
SETTING THE VENTILATION
The ventilation must be set according to applicable stand-
ards. Adjust the supply air flow to guarantee a negative
pressure.
The settings are made in menu 7.1.4.
Even if ventilation is roughly set at installation it is important
that a ventilation adjustment is ordered and permitted.
Caution
An incorrectly set ventilation flow can damage the
house and may also increase energy consumption.
NOTE
Order a ventilation adjustment to complete the
setting.
Ventilation capacity
00 2010 4030 906050 8070 100
100
200
300
400
500
600
Tillgängligt tryck
(Pa)
Luftflöde
(l/s)
30%
100%
80%
60%
40%
70%
50%
90%
20%
Available pressure
Airflow
Fan rating1
0100 20 30 40 50 60 70 80 90 100
10
20
30
40
50
80
60
70
90
E ekt
(W)
Flöde
(l/s)
30%
100%
80%
60%
50%
70%
40%
20%
90%
Output
Airflow
1The diagram shows the power consumption per fan.
NIBE ERS 20-300Chapter 6 | Commissioning and adjusting14
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Commissioning and adjusting

Activating ERS 20 can be performed via the start guide or
directly in the menu system.
The main product’s software must be the latest version.
Caution
Also see the Installer Manual for the main product.
Start guide
The start guide appears upon first start-up after 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
Activating/deactivating of accessories.
Select "ERS S10/20/30 1" - "ERS S10/20/30 8".
MENU 7.2.11 - VENT. HEAT EXCHANGER (ERS)
Lowest extract air temp.
Setting range: 0 – 10 °C
Product
Setting range: ERS10, ERS20/ERS30
Action level monitor
Setting range: Level monitor/Blocked/Off
Lowest extract air temp.: Set the lowest extract air temper-
ature to prevent the build-up of ice on the heat exchanger.
Action level monitor: ERS 20 has a built-in level monitor, and
the fans stop when the input is interrupted. When "Level
monitor" is selected, the product issues an alert when the
input is interrupted; when "Blocked" is selected, text is dis-
played instead in operating info.
MENU 1.2.1 - FAN SPEED
Alternatives: normal and speed 1 – speed 4
The ventilation in the accommodation can be temporarily
increased or reduced here.
When you have selected a new speed a clock starts a count
down. When the time has counted down the ventilation
speed returns to the normal setting.
If necessary, the different return times can be changed in
menu 1.2.5.
The fan speed is shown in brackets (in percent) after each
speed alternative.
MENU 1.2.2 - NIGHT COOLING
Night cooling
Setting range: on/off
Start temp exhaust air
Setting range: 20 – 30 °C
Min. diff. ind. temp. - outd. temp.
Setting range: 3 – 10 °C
Night cooling during heating
Setting range: on/off
Here, you can activate night cooling. When the temperature
in the house is high, and the outdoor temperature is lower,
a cooling effect can be obtained by forcing the ventilation.
When night cooling is activated, the fans run at the speed
4. For activated night cooling, the bypass damper (QN37) is
open.
Start temp exhaust air: Here, you set the exhaust air tem-
perature at which night cooling will start.
Min. diff. ind. temp. - outd. temp.: If the temperature differ-
ence is greater than the set value for "Min. diff. ind. temp. -
outd. temp.", and the exhaust air temperature is higher than
the set value for "Start temp exhaust air", the ventilation
operates at speed 4 until one of these conditions is no longer
valid.
Night cooling during heating: It is possible to have night
cooling during the time heating is permitted.
MENU 1.2.5 - FAN RETURN TIME
speed 1 – speed 4
Setting range: 1 – 24 h
Here, you select the return time for the temporary change
of ventilation speed (speed 1 – speed 4), regardless of
whether the speed has been changed in menu 1.2.1 - "Fan
speed", via the home screen or via myUplink.
Return time is the time it takes before the temporary ventil-
ation speed returns to normal speed.
MENU 1.2.6 - FILTER CLEANING INTERVAL
Months between filter cleaning
Setting range: 1 – 24 months
The filters in ERS 20 are of a type that should not be cleaned;
they have to be replaced instead. These must be replaced
regularly, although how often depends of factors such as
the amount of particles in the ventilation air. Test to find
out what is most appropriate for your installation.
15Chapter 7 | Activating ERS 20NIBE ERS 20-300
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Activating ERS 20

Set the interval for the reminder in this menu.
The menu shows the time remaining until the next reminder,
and you can also reset active reminders.
MENU 1.2.7 - VENTILATION RECOVERY
Temp stop of heat recovery
Setting range: 5 – 30 °C
Min. diff. ind. temp. - outd. temp.
Setting range: 2 – 10 °C
Recovery stop during heating
Setting range: on/off
Cooling recovery
Setting range: on/off
St temp sup air cooled by exh air
Setting range: -20.0 – 41.0 °C
Min diff outd and exhaust air
Setting range: 3.0 – 10.0 °C
When there is no heating demand, and the outdoor temper-
ature is approaching the indoor temperature, heat recovery
is stopped to prevent the house from being heated further.
Caution
Only the heat recovery is stopped, not the ventila-
tion.
Temp stop of heat recovery: Here, you set the outside tem-
perature at which ventilation recovery is to stop.
Min. diff. ind. temp. - outd. temp.: Here, you set the temper-
ature difference between the indoor air and the outdoor air
that is required in order for ventilation recovery to start.
Recovery stop during heating: Stopping ventilation recovery
during the time heating is permitted is possible.
Cooling recovery: When there is no heating demand, ventil-
ation recovery is stopped to prevent the house from being
heated further. When it is warm indoors and even warmer
outdoors, ERS 20 can be used to prevent the house from
heating up more than necessary. During cooling recovery,
the cooler air from the house is used to cool the incoming
air.
"Cooling recovery" is started when the exhaust air temper-
ature is a certain number of degrees below the outdoor
temperature and it is warm outside.
St temp sup air cooled by exh air: Here, you set the outdoor
temperature at which cooling recovery will start.
Caution
"St temp sup air cooled by exh air" cannot be lower
than "Stop heating" in menu 7.1.10.2 – "Auto mode
setting".
Min diff outd and exhaust air: Here, you set the temperature
difference between outdoor air and exhaust air that is re-
quired in order for cooling recovery to start.
MENU 7.1.4.1 - FAN SPEED, EXHAUST AIR
Fan speed
"Normal" and "Fan speed 1" – "Fan speed 4"
Setting range: 0 – 100%
Set the speed for the five different selectable speeds for
the fan here.
MENU 7.1.4.2 - FAN SPEED, SUPPLY AIR
Fan speed
"Normal" and "Fan speed 1" – "Fan speed 4"
Setting range: 0 – 100%
Set the speed for the five different selectable speeds for
the fan here.
MENU 6.2 - SCHEDULING
In this menu, you schedule repeated changes of ventilation.
Caution
A schedule repeats according to the selected set-
ting (e.g. every Monday) until you go into the menu
and switch it off.
MENU 7.4 - SELECTABLE IN/OUTPUTS
Select here whether you want to activate fan speed for the
relevant AUX input.
NIBE ERS 20-300Chapter 7 | Activating ERS 2016
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In most cases, the main product notes a malfunction (a
malfunction can lead to disturbance in comfort) and indic-
ates this with alarms and shows action instructions in the
display.
Troubleshooting
If the operational interference is not shown in the display
the following tips can be used:
BASIC ACTIONS
Start by checking the following items:
•That the main product is running and that the supply cable
to ERS 20 is connected.
•Group and main fuses of the accommodation.
•The property's earth circuit breaker.
•The main product’s fuses.
•The main product’s temperature limiter.
LOW OR A LACK OF VENTILATION
•Level monitor (BL2) tripped.
–Checking the condensation water drain and water seal.
•The exhaust air filter (HQ10) and/or the supply air filter
(HQ11) is clogged.
–Replace the filters.
•The ventilation is not adjusted.
–Order/implement ventilation adjustment.
•Closed, too much choke or blocked ventilation device.
–Check and clean the ventilation devices.
•Fan speed in reduced mode.
–Enter the main product’s menu 1.2.1 and select "Normal".
•External switch for changing the fan speed activated.
–Check any external switches.
•Fan running slow because of low incoming outdoor air
temperature.
–Check the function and settings for the electrical air
heater (EAH 20) if installed.
HIGH OR DISTRACTING VENTILATION
•The exhaust air filter (HQ10) and/or the supply air filter
(HQ11) is clogged.
–Replace the filters.
•The ventilation is not adjusted.
–Order/implement ventilation adjustment.
•Closed, too much choke or blocked ventilation device.
–Check and clean the exhaust air devices.
•Fan speed in forced mode.
–Enter the main product’s menu 1.2.1 and select "Normal".
•External switch for changing the fan speed activated.
–Check any external switches.
•Silencers not correctly installed.
–Check the silencers.
17Chapter 8 | Disturbances in comfortNIBE ERS 20-300
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Disturbances in comfort

Detailed information about the accessories and complete
accessories list available at nibe.eu.
Not all accessories are available on all markets.
ELECTRICAL AIR HEATER EAH 20
In cold weather, EAH heats the incoming outdoor air slightly
to prevent the condensation in ERS 20 from freezing to form
ice. EAH should be used in houses where the outdoor tem-
perature can be continuously lower than -5°C.
EAH 20-900
(300-900 W)
Part no. 067 604
NIBE ERS 20-300Chapter 9 | Accessories18
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Accessories

Dimensions
1270 (1365 inkl takfäste)
Ø125
675
110125
1200
255130
120120
240
Ø125
Ø15
1270 (1365 incl. roof mounting)
19Chapter 10 | Technical dataNIBE ERS 20-300
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Technical data

Technical specifications
ERS 20Type
Electrical data
230 V ~ 50HzVSupply voltage
10AFuse
2 x 85WDriving power fan
IP X1BEnclosure class
Ventilation
Coarse 65%Filter type, exhaust air filter
ePM1 55%Filter type, supply air filter
Noise
59dB(A)Sound power level (LW(A))1
41.1dB(A)Sound pressure level (LP(A))at1m2
52.2dB(A)Sound pressure level (LP(A))at1m3
Pipe connections
125mmVentilation Ø
15mmCondensation water drain Ø
Dimensions and weight
AEfficiency class4
2.4mLength, supply cable
2.0mLength, communication cable
1,200mmWidth
240mmHeight
675mmDepth
25kgWeight
066 220Part No.
160 l/s (216 m3/h) at 50 Pa
235 l/s (126 m3/h) at 70 Pa
369 l/s (250 m3/h) at 150 Pa
4Scale for efficiency class: A+ to G.
Dry temperature efficiency according to
EN 308
78 (l/s)
(m3/h)
80
82
84
86
88
90
92
94
Temperatur
(%)
0
0
35 50 75
100 150 200 250 30050
Temperature efficiency
Airflow
Outdoor air: 5 °C Exhaust air 25 °C RH exhaust air: <27.7 %
NIBE ERS 20-300Chapter 10 | Technical data20
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