Nibe ERS 20 User manual

UHB EN 2127-3
331817
USER MANUAL
HRV unit
NIBE ERS 20
LEK

LEK
Knob
LEK

41 Important information
4Installation data
6Safety information
7Serial number
8Compatible products
9ERS 20 - An excellent choice
102 The heating installation – the heart of the house
11HRV unit function
12Maintenance of ERS 20
163 Disturbances in comfort
16Troubleshooting
184 Technical data
195 Glossary
23Contact information
3Table of ContentsNIBE ERS 20
Table of Contents

Installation data
ERS 20Product
Serial number
Installation date
Installer
S-Series
SetFact. sett.NameNo.
75%Fan speed, exhaust air7.1.4.1
60%Fan speed, supply air7.1.4.2
Vent. heat exchanger (ERS)7.2.11
5 °C
4 °C
lowest extract air temp.
bypass at excess temperature
F-Series
SetFact. sett.NameNo.
75%fan sp. exhaust air5.1.5
60%fan sp. supply air5.1.6
5 °C
4 °C
exhaust/supply air module
lowest extract air temp.
bypass at excess temperature
5.3.12
NIBE ERS 20Chapter 1 | Important information4
1 Important information

Serial number must always be given
It is hereby certified that the installation has been carried out in accord-
ance with the instructions in the Installer manual and applicable regula-
tions.
_________________________Signed__________________Date
5Chapter 1 | Important informationNIBE ERS 20

Safety information
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 supervision or in-
struction 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.
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 2021.
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 observe when maintaining your installation.
NIBE ERS 20Chapter 1 | Important information6

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.
7Chapter 1 | Important informationNIBE ERS 20

Compatible products
S-SERIES
• SMO S40• VVM S320
• VVM S325
• S1155
• S1255
F-SERIES
• SMO 40• VVM 310
• VVM 320
• VVM 325
• VVM 500
• F1145
• F1155
• F1245
• F1255
• F1345
• F1355
NIBE ERS 20Chapter 1 | Important information8

ERS 20 - An excellent choice
ERS 20 is an HRV unit with high temperature efficiency and low energy
consumption.
EXCELLENT PROPERTIES FOR ERS 20:
•DC fans
Two energy-efficient DC fans (Class A) are integrated in the HRV unit.
•Low noise level
The HRV unit has a very low noise level.
•Easy to install
The HRV unit is easy to install together with a NIBE heat pump or indoor
module. During installation, the HRV unit is connected to the main
product, which enables you to read off the HRV unit’s values in the
main product’s display.
9Chapter 1 | Important informationNIBE ERS 20

4 ºC
0 ºC
18 ºC
22 ºC
1
2
Outdoor air
Extract air
Supply airExhaust air
A E
B
D
C
NIBE ERS 20Chapter 2 | The heating installation – the heart of the house10
2 The heating installation – the
heart of the house

HRV unit function
An HRV unit is a ventilation heat exchanger that utilises the heat in the
building’s ventilation air to heat the incoming outdoor air. From the out-
going ventilation air (1), heating energy is recovered from the dwelling
and transported to the HRV unit. In the heat exchanger (2), the heat from
the indoor air is transferred to the incoming outdoor air.
Ventilation air
The hot air is transferred from the rooms to the HRV unit via the building’s ventilation
system using a fan.
A
In the HRV unit, the air releases heat energy and the temperature drops significantly.
The cold air is then blown out of the building.
B
Outdoor air
The outdoor air is transferred to the HRV unit via the building’s ventilation system.
C
In the HRV unit, the air absorbs the heat energy and the temperature is raised.
D
A fan blows the heated air into those rooms that have supply air inlets.
E
The temperatures are only examples and may vary between different installations and
time of year.
11Chapter 2 | The heating installation – the heart of the houseNIBE ERS 20

Maintenance of ERS 20
REGULAR CHECKS
Your HRV unit requires minimal maintenance after commissioning.
However, it is recommended that you check your installation regularly.
If something unusual occurs, messages about the malfunction, in the
form of different alarm texts, appear in the main product display.
NOTE
Always switch off the power and wait until the fans have
stopped before opening ERS 20.
Cleaning the ventilation devices
The building’s ventilation devices should be
cleaned regularly with, for example, a small
brush to maintain the correct ventilation.
The device settings must not be changed.
NOTE
If you take down more than one ventilation device for cleaning,
do not mix them up.
Replacing the air filter
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.
Caution
The efficiency of the installation can be reduced by a dirty air
filter.
NIBE ERS 20Chapter 2 | The heating installation – the heart of the house12

In the main product’s display, you will receive a reminder to check the
filters. The factory setting for the reminder is every three months, al-
though the countdown begins again if the power to the main product is
interrupted.
1. Switch off the main product.
2. Release the air filters by turning the knobs on the covers a quarter
of a turn.
3. Remove the covers.
4. Pull out the filter cassettes.
5. Check the condition of the filters andreplace if needed.
6. Carry out assembly in reverse order.
Even if the filters look clean, dirt collects in them and this affects the
efficiency of the filters. For this reason, replace them after approx. 1
years. New filters can be ordered via a dealer for NIBE.
Exhaust air filter: Coarse 65%
Supply air filter: ePM1 55%
LEK
Supply air filter
Exhaust air filter
13Chapter 2 | The heating installation – the heart of the houseNIBE ERS 20

Check the water lock for condensation water
The water seal must be checked at least once a year, ideally in the au-
tumn.
The water seal is located outside ERS 20. Contact your installer if you
are unsure of where to find it.
No condensation water is generated in the HRV unit during the warm
period of the year and the water seal will dry out.
During the colder parts of the year, ERS 20 can produce several litres of
condensation water every day. If the condensation outlet is not working,
this may cause water damage inside the home.
The water seal must not dry out during this part of the year, because air
will be drawn into the HRV unit due to the negative pressure in the unit,
which will then prevent the condensation water from running out.
1. Check that the condensation drain and the water seal are not clogged
with dirt.
2. Pour approx. one litre of water into the water seal.
3. Check that the water runs through unobstructed.
Cleaning the heat exchanger
Check the heat exchanger every other year and clean if necessary. Avoid
contact with the fins.
Caution
Do not damage the fins. If you are unsure, contact your installer
for help with cleaning.
1. Remove the four screws holding the heat exchanger.
2. Remove the trim and the metal rail.
3. Carefully lift out the heat exchanger.
4. Clean the heat exchanger carefully, e.g. with a vacuum cleaner. If
necessary, you can use warm water and mild soap.
Carry out assembly in reverse order.
NIBE ERS 20Chapter 2 | The heating installation – the heart of the house14

NOTE
It is important that the metal rail is positioned on the same side,
so that the heat exchanger is angled in the same direction as
previously when reinstalling.
LEK
Heat exchanger
15Chapter 2 | The heating installation – the heart of the houseNIBE ERS 20

In most cases, the main product notes a malfunction (a malfunction can
lead to disturbance in comfort) and indicates 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.
LOW OR A LACK OF VENTILATION
• Level monitor tripped.
– Checking the condensation water drain and water seal.
• Filters blocked.
– Replace the filters.
• The ventilation is not adjusted.
– Order ventilation adjustment.
• Closed, too much choke or blocked ventilation device.
– Check and clean ventilation valves (see page 12).
• Fan speed in reduced mode.
NIBE ERS 20Chapter 3 | Disturbances in comfort16
3 Disturbances in comfort

– S-series: Enter the main product’s menu 1.2.1 and select "Normal".
F-series: Enter the main product’s menu 1.2 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.
– Contact the installer in the event of recurring problems.
HIGH OR DISTRACTING VENTILATION
• Filters blocked.
– Replace the filters.
• The ventilation is not adjusted.
– Order ventilation adjustment.
• Closed, too much choke or blocked ventilation device.
– Check and clean ventilation valves (see page 12).
• Fan speed in forced mode.
– S-series: Enter the main product’s menu 1.2.1 and select "Normal".
F-series: Enter the main product’s menu 1.2 and select "normal".
• External switch for changing the fan speed activated.
– Check any external switches.
• Silencers not correctly installed.
– Contact your installer!
17Chapter 3 | Disturbances in comfortNIBE ERS 20

Detailed technical specifications for this product can be found in the in-
stallation manual (nibe.eu).
NIBE ERS 20Chapter 4 | Technical data18
4 Technical data

CLIMATE SYSTEM
The climate system can also be called the heating and/or cooling system.
The building is cooled or heated using radiators, under floor coils or
convector fans.
DISTURBANCES IN COMFORT
Disturbances in comfort means unwanted changes in the indoor comfort,
e.g. that the indoor temperature is not at the desired level.
EXHAUST AIR
The air that comes from the exhaust air device in the various rooms of
the accommodation, to ERS 20.
EXHAUST AIR DEVICES
Vents, usually in the ceiling, in the kitchen/bathroom/clothes closet where
the air is drawn in to be forwarded to ERS 20.
EXTRACT AIR
The air from which the ERS 20 has retrieved heat, and thereby cooled.
This air is blown out of the house.
HEAT EXCHANGER
Device that transfers heat energy from one medium to another without
mixing mediums.
OUTDOOR AIR
Air that is drawn into the ERS 20 and heated.
SUPPLY AIR
The heated air that is blown from ERS 20 and out into the room.
19Chapter 5 | GlossaryNIBE ERS 20
5 Glossary

SUPPLY AIR DEVICE
Valves, usually in the ceiling, where the heated supply air is blown out
and aids in heating up the accommodation.
NIBE ERS 20Chapter 5 | Glossary20