nilan Compact P User manual

USER MANUAL
Compact P / Compact P Polar
CTS602 HMI BY NILAN
Version 4.10 - 19.06.2020
B24_Compact-P_GB

2
Table of contents
General information
Safety ............................................................................................................................................................................................................ 3
Power supply ......................................................................................................................................................................................... 3
Heat pump domestic hot water ......................................................................................................................................................... 3
Introduction .................................................................................................................................................................................................. 4
Documentation ..................................................................................................................................................................................... 4
Type plate .............................................................................................................................................................................................. 4
User panel
Functions in the user panel ........................................................................................................................................................................ 5
Main screen elements .......................................................................................................................................................................... 5
Settings options on the main screen ................................................................................................................................................. 6
Warning and alarms ............................................................................................................................................................................. 7
Settings menu overview ..................................................................................................................................................................... 7
Service and maintenance
General information ................................................................................................................................................................................... 8
Regular maintenance ................................................................................................................................................................................. 8
Operation of the ventilation unit ....................................................................................................................................................... 8
Illustration of filter change ................................................................................................................................................................. 9
Service ........................................................................................................................................................................................................10
General cleaning .................................................................................................................................................................................10
Water trap ............................................................................................................................................................................................10
Heat exchanger ...................................................................................................................................................................................10
Checking the sacrificial anode ..........................................................................................................................................................11
Checking the safety valve .................................................................................................................................................................11
Check the air intake and outlet ........................................................................................................................................................11
Check ventilation ducts .....................................................................................................................................................................11
The heat pump ....................................................................................................................................................................................11
User settings
Setting the unit ..........................................................................................................................................................................................12
Turn off the ventilation unit .............................................................................................................................................................12
Operating function .............................................................................................................................................................................12
Alarm ....................................................................................................................................................................................................13
Show data ............................................................................................................................................................................................13
Date/Time ............................................................................................................................................................................................14
Week program .....................................................................................................................................................................................14
Heating of supply air ..........................................................................................................................................................................15
Domestic hot water ............................................................................................................................................................................17
After heating element .......................................................................................................................................................................17
Cooling ..................................................................................................................................................................................................18
Air humidity .........................................................................................................................................................................................19
CO2 Control ..........................................................................................................................................................................................20
Air exchange ........................................................................................................................................................................................20
Air filter ................................................................................................................................................................................................21
Temperature control .........................................................................................................................................................................22
Language ..............................................................................................................................................................................................22
Alarm list
Compact ......................................................................................................................................................................................................23
Alarm list ..............................................................................................................................................................................................23
Troubleshooting
Emergency operation domestic hot water ....................................................................................................................................25
Errors and solutions domestic hot water .......................................................................................................................................26
Technical data
EU/EC Declaration of Conformity ...................................................................................................................................................27
Ecodesign data - Hot water production ..........................................................................................................................................28
Disposal
The environment - part of the solution .................................................................................................................................................29
Ventilation unit ...................................................................................................................................................................................29

3
General information
Safety
Power supply
Heat pump domestic hot water
The heat pump must undergo suitable service inspections under applicable legislation and regulations to keep it in good condition and
in compliance with safety and environmental requirements.
Responsibility for maintenance of the heat pump rests with the owner/user.
CAUTION
Always disconnect the power supply to the unit if an error occurs that cannot be rectified via the control panel.
CAUTION
If an error occurs on electrically conductive parts of the unit, alway contact an authorised electrician to rectify the error.
CAUTION
Always disconnect the power to supply to the unit before opening the unit doors, for instance for installation, inspection,
cleaning and filter change.
CAUTION
Avoid direct contact with the heating system pipes in the heat pump as they can get very hot.
CAUTION
To protect the heat pump against damage, it is fitted with the following safety equipment.

4
Introduction
Documentation
The following documents will be supplied with the unit:
• Quick guide
• Wiring diagram
In the Quick guide you will find important information regarding installation and start-up of the unit. If you require further information
regarding, for instance, installation of accessories or additional settings in the software, or if you need an extended user manual, the
following documents can be downloaded from the Nilan website:
• Installation instructions
• Software instructions
• User Manual
• Wiring diagram
The instructions can be downloaded from https://www.nilan.dk/en-gb/frontpage/download.
If you have questions regarding installation and operation of the unit after having read the instructions, please contact your nearest
Nilan dealer. A list of Nilan dealers is available on www.nilan.dk/forhandlere.
From factory, the unit has been tested and is ready for operation.
Type plate
On the inside, in the bottom right of the unit is Nilan's nameplate.
ATTENTION
The unit must be started up immediately after installation and connection to the duct system.
When the ventilation unit is not in operation, humidity from the rooms will enter the duct system and create condensate
water that can run out of the valves and cause damage to floors and furniture. Condensation may also form in the ven-
tilation unit, which can damage its electronics and fans.

5
User panel
Functions in the user panel
Main screen elements
The main screen of the HMI user panel contains the settings options and the information that an operator mostly uses.
1. Shows the current room temperature in the house, measured via
the extract air
2. Shows the current air humidity. If a CO2 meter has been installed, it
will be shown next to air humidity
3. Shows the current fan speed level
4. Shows the current supply air temperature
5. Shows the current outdoor temperature measured via the outdoor
air intake
6. Shows the current discharge air temperature
7. Shows the menu icons listed below
8. Shows the mode icons listed below
9. Show hot water temperature
10. Access to the settings menu which contains more settings options
Menu icons Operation icons
Stop icon
Indicates that the unit is off
Compressor icon
Indicates that the compressor is active
User selection icon
Indicates that the user selection function is active
Heating icon
Indicates that the unit is heating up the supply air via
the compressor or the after-heating element
Week program icon
Indicates that the week program function is active
Cooling icon
Indicates that the unit is cooling the supply air via
the compressor or the bypass
Alarm icon
Is displayed during alarms or warnings
Domestic hot water icon
Appears when the unit produces hot water. Light-
ning is displayed when the power supply is active
De-icing icon
Appears when the heat pump defrosts

6
Settings options on the main screen
The settings options which the user needs in daily life can all be controlled from the main screen of the panel.
If you press current fan speed level, the
set fan speed level will be displayed.
You can change the fan speed level by
using the up-and-down arrows followed
by the confirm icon (bottom right) or the
cancel icon (bottom left).
There may be a difference between set
fan speed level and the actual fan speed
level as the control system will override
the set level, for instance, at high/low air
humidity or during cooker hood opera-
tion.
If you press current room temperature,
the set room temperature will be
displayed.
You can change the room temperature by
using the up-and-down arrows followed
by the confirm icon (bottom right) or the
cancel icon (bottom left).
If you press the current hot water
temperature, the set hot water
temperature will be displayed.
You can change the hot water
temperature by using the up-and-down
arrows followed by the confirm icon
(bottom right) or the cancel icon (bottom
left).

7
Warning and alarms
Settings menu overview
The settings menu is constructed to make it easy to navigate through.
If the ventilation unit is faulty or an error
occurs, there will be either a warning or
an alarm. The icon will appear in the top
right hand corner in the menu bar.
If you press the symbol, a brief descrip-
tion of the warning or the alarm will be
displayed.
You will find more detailed descriptions in
the "Alarm List" section of this document.
When the problem has been solved, you
can reset the warning or alarm by
pressing “Clear Alarm”.
A warning indicates that something requires attention, for instance that filters need changing.
The ventilation unit is in operation.
An alarm indicates a serious fault with the unit that is likely to require investigation by an expert.
The ventilation unit has stopped.
You navigate through the settings menu by pressing the arrow below or above.
If you want to access a menu, tap the text for that menu and it will open.

8
Service and maintenance
General information
A ventilation unit from Nilan can last for many years if it is properly serviced and maintained. Ventilation units are often hidden away,
and they are therefore rarely given attention in everyday life. But just as you maintain your car, your ventilation unit will need servic-
ing regularly to keep it functioning properly.
If appropriate service and maintenance are not carried out, the ventilation unit may get damaged. It can also result in increased energy
consumption and a poorer indoor climate. Less air will run through the unit even if the fans are running faster. But the ventilation unit
does not operate well with dirty filters, a clogged up heat exchanger and dusty fans.
You can set an alarm in your calendar on your phone that will notify you when your ventilation unit is due a service. Alternatively, you
can make a service appointment with your local Nilan dealer or service company.
Regular maintenance
Operation of the ventilation unit
The control panel should be positioned where you will see it regularly. This will allow you to observe the operation of the ventilation
unit and it will ensure that you notice potential alarms.
You can also ensure that the unit operates as intended. It is unnecessary to adjust the settings and the unit continuously. The control
system will automatically regulate the operation. However, initially it may be necessary to finetune, for example, room temperature.
But once that is done, you should not keep readjusting it.
The temperature for the domestic hot water should be at miimum 51 ° C, to minimize the risk of legionella. Are you, for example. a large
family and therefore has a larger hot water consumption, the temperature may need to be set higher.
Filters
The primary purpose of the filters is to protect the ventilation unit and especially the heat exchanger and the fans that could otherwise
become damaged by dust and dirt.
Dirty filters result in a poorer indoor climate and a higher energy consumption. Dirty filters must therefore be replaced. Dirty filters
can also affect the humidity control system in the ventilation unit so it no longer works as intended.
The factory setting of the control system is set to 90 days, which will suit most installations. But if you live in a city close to a heavily
congested road, you may need to replace the filters more often. Conversely, if you live in a rural setting, you may not need to replace
filters quite as often.
The standard filters in the ventilation unit are ISO Coarse > 90% (G4). If you install a pollen filter ISO ePM1 50-65% (F7), you will not
need to replace the pollen filter as often, as its filter area is larger. It may then only be necessary to replace the pollen filter every sec-
ond or third time, depending on its condition.

9
Illustration of filter change
1.Before opening the door, turn off the unit on the user
panel under ”Operation” in the settings menu..
2. Turn the thumb screws in the door at the top right of
the unit and open the door.
3. Remove the two filters from the unit 4. It is advisable that you vacuum the filter chambers
for potential dirt and dust
5. Remove the filter sheet from the filter frame. 6. Keeping the smooth side facing downwards, place the
new filter sheet in the filter frame
7. Press the filter sheet firmly in place and carefully
push it to the sides of the filter frame. The filter is
placed back in the unit with filter mat upward
8. In the ALARM menu on the control panel, press the
alarm symbol at the top right and reset the alarm here.
Turn on the unit again.

10
Service
General cleaning
The ventilation unit should be cleaned on the inside once a year. Dust can slip through the filters and mix with dampness from the ex-
tract air.
You may want to remove dust with a vacuum cleaner before wiping the ventilation unit inside. For this, use a slightly damp cloth with
a mild soap solution. Be careful around potentially sharp edges. Be careful not to get water into the electrical control system.
The ventilation unit should also be cleaned on the outside using a slightly damp cloth and a mild soap solution.
The ceiling valves
Over time a ring may develop round the inlet valves. This is a natural process and is due to dust in the
room air, not to defective filters or failure to change filters.
As very few painted ceilings are washable, you are recommended to vacuum round the valve and then
wipe the area with a damp cloth.
It is a good idea to dismantle and clean the valves when necessary. The valves have been set by the
installer for a specific airflow, so it is important not to rotate them, as this will change the setting and
unbalance the ventilation system.
Water trap
When the ventilation unit in cold periods runs with high heat recovery, condensation of the exhaust air takes place. It is important tha
there is free drainage form the condensate tray so that the water can drain out. If not, it will at some point run out of the unit door and
cause major water damage.
Procedure:
1. Pour water into the condensate tray
2. Close the ventilation unit door
3. Switch on the ventilation unit and let it run for 10 min.
4. Open the door of the ventilation unit and check that the water has run out and not back into the condensate tray
5. If the water has run out everything is ok
6. If the water has not run out, check the water strap and the entire drain for where it has stopped
Heat exchanger
The counterflow heat exchanger is a central part of the ventilation unit. It heats up the cold outdoor air with energy from the warm
extract air. To maintain a high level of heat recovery, it is important that the heat exchanger is not clogged with dirt.
Experience indicates that it should not be necessary to lift out and clean the heat exchanger every year. However, if it appears to be
dirty, you should lift it out and clean it.
The easiest way to clean the counterflow heat exchanger is in the shower. Use lukewarm water and rinse it well from both sides. Allow
it to drip off before remounting it in the ventilation unit.
WARNING
Stop the ventilation unit on the control panel and switch off the power supply for the unit before opening its front door.
ATTENTION
Iff the cooling function is deactivated, check your condensate drain every autumn befor the cold sets in.
(Condensation typically takes place at an outdoor temperature < 10 °C)

11
Checking the sacrificial anode
An electrically monitored anode has been mounted for protecting the hot water tank. When it is time to
change the anode, a warning will appear on the control panel display.
Check the sacrificial anode to ensure that the electrical monitoring is undamaged.
Checking the safety valve
The safety valve for the domestic hot water should have an annual function check to ensure it is functional at all times.
The function check must be carried out by a trained plumber.
Check the air intake and outlet
It is important for operation of the unit that air can freely move through the air intake and outlet.
If roof stacks have been fitted to the air intake and outlet, check that they are not blocked with birds' nests, leaves or other dirt which
can hamper air passage.
If, instead of roof stacks, grilles have been mounted in facades or eaves, check that they are not clogged with leaves or dirt. Grilles are
particularly likely to become clogged.
Check ventilation ducts
It is important for operation of the unit that there is free air passage through the ventilation ducts.
After some years of operation, dirt will attach itself to ventilation ducts or tubes, and accumulations may lead to higher pressure drop
in the ducts, leading to higher power consumption. It is therefore important to clean out the ducts when too much dirt has collected.
After attending to the inlet and outlet valves, it will be advisable to have them adjusted again, to
ensure optimum operation of the ventilation system.
However, it will not be necessary to clean ducts more than every few years.
The heat pump
The heat pump must be inspected in accordance with applicable laws and regulations, such that it is kept in good condition and meets
safety and environmental requirements.
The installer is obliged to inform the owner/user about applicable laws and regulations.

12
User settings
Setting the unit
Turn off the ventilation unit
If it is necessary to open the doors while servicing the ventilation unit, for instance when changing filters, the unit must be turned off.
This is done under the menu Operation.
> Operation
Operating function
You can program the unit to operate in Auto, Heating or Cooling mode.
> Operating function
When the unit is turned off, this icon appears on the main screen.
ATTENTION
It is important that the power is turned off, if you want to work with the electrical components in the ventilation unit.
ATTENTION
It is important that the ventilation unit is not turned off for long periods, as this could cause condensation problems in
the duct system.
> Operation Settings:
Description:
Off / On
The ventilation unit must be turned off before the doors are
opened during service.
ATTENTION
The Heating and Cooling functions overrules the week program. If a week program has been set up, the mode will
automatically change to Auto at the next change in the week program.
> Operating function Settings:
Standard setting:
Description:
Auto / Cooling / Heating
Auto
Auto:
The unit operates in accordance with the set values.
Cooling:
The unit operates in accordance with the set values, but cooling
is possible in winter mode if the preconditions for cooling are
present.
Heating:
The unit operates in accordance with the selected values, but
the bypass damper cannot be opened and active cooling not be
activated even if the preconditions are present.

13
Alarm
In the “Alarm” menu item you can see warnings and alarms. This is also where you reset them once the problem has been solved.
> Alarm
Show data
You can access current operational data for the ventilation unit. This will allow you to check that the unit operates satisfactorily and
to identify the cause of potential alarms.
> Show data
If an alarm or a warning is active, the alarm icon will be displayed in the upper righthand corner of the control panel.
> Alarm number and name Description: Press the alarm to display a list of:
• Alarm ID-number
• Type of alarm
• Critical alarm or warning
(The alarm list will tell you how to proceed).
ATTENTION
As long as the problem has not been solved, the alarm or warning will remain active. When the problem has been solved,
you will be able to reset the alarm or warning by pressing "Clear alarm"
> Operating state Description: Shows the operating setting in which the unit is running.
> Bypass Description: Shows whether the bypass damper is open or closed.
> T1 Outdoor temperature Description: Shows the temperature before the pre-heating element.
> T2 Supply air Description: Show the supply air tempereture, if an after-heating element is
not installed.
> T4 Discharge Description: Shows the discharge air temperature.
> T5 Condenser Description: Shows the condenser temperature.
> T6 Evaporator Description: Shows the evaporator temperature.
> T7 Supply air Description: Shows the supply air temperature provided an after-heating
element has been installed.
> T10 Extract air/Room Description: Shows the current room temperature as measured in the
extract air.
> T11 Top hot water Description: Shows the current temperature in the top of the domestic hot
water tank. Controls the supplementary electric heating.
> T12 Bottom hot water Descripton: Shows the current temperature in the bottom of the domestic
hot water tank. Controls the compressor.
> Air humidity Description: Shows the current air humidity in the house.
> CO2 Description: Shows the current CO22 level in the house (only if installed).
> Supply air fan Description: Shows the level at which the supply air fan is operating.
> Extract air fan Description: Shows the level at which the extract air fan is operating.
> Unit information Description: Select "Unit information" for more information.
> Unit type Description: Shows the name of the unit.
> Software version Description: Shows the installed software version.
> Panel software Description: Shows installed software version on the panel.

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Date/Time
It is important to set date and time correctly. It makes it easier to localise errors indicated in an error report. When logging data, it is
important to be able to follow the history. The time is shown under “Date / Time” in the display.
> Date / Time
Week program
You can program the ventilation unit to run in accordance with specific settings at fixed times during the week via a week program.
> Week program
> Year Description: Select "Year" in the panel and then select the correct year.
> Month Description: Select "Month" in the panel and then select the correct month.
> Day Description: Select "Day" in the panel and then select the correct day.
> Hour Description: Select "Hour" in the panel and then select the correct hour.
> Minute Description: Select "Minute" in the panel and then select the correct amount
of minutes.
On the main screen in the top right side an icon will be displayed when the week program is active
> Select program Settings:
Standard setting:
Description:
Off / 1 / 2 / 3
Off
The control allows you to set 3 programs for different situa-
tions e.g.:
• Normal operation
• Holliday operation
> Edit program Description: The selected week program is now active and can be edited.
> Monday Settings: Here weekday is selected.
>Function 1 Settings: Here you select the function you want to edit.
> Start time Settings:
Standard setting:
Description:
Hours and minutes
6:00
Set the time for the program to start.
The program will run until the next change in the week program.
> Ventilation Settings:
Standard setting:
Description:
Level 1 / Level 2 / Level 3 / Level 4 / Off
Level 3
Select the desired fan speed level here.
> Temperature Settings:
Standard setting:
Description:
5  40 °C
22 °C
Set the desired room temperature here.
The same settings are made for
all functions.
> Reset program Settings: You can reset the program by selecting the “Approve” icon.

15
Heating of supply air
This menu item is only visible, if a after heating element is installed and activated in the service menu.
When the room temperature (measured in the extract air) falls below the desired room temperature set in the display, the heat pump
and the after heating element vil start heating the supply air.
> Supply air heating
ATTENTION
A after heating element is not standard, but can be purchased as accessory and can be retrofitted if wanted.
> Setting Settings:
Standard setting:
Description:
Off / Heating / Demand
Demand
Off: The supply air is not heated.
Heating: Constant heating in relation to min./max.
Demand: The supply air temperature is regulated automatically
by the curve setting.
> Heating Description: Constant heating of the supply air via PI-regulation in
accordance with the room temperature.
> Min. supply air temp. Settings:
Standard setting:
Description:
5  40 ºC
20 ºC
Minimum supply air temperature.
> Max. supply air temp. Settings:
Standard setting:
Description:
20  50 ºC
40 ºC
Maximum supply air temperature.
> Outdoor. temp.
compensation
Settings:
Standard setting:
Description:
0  10
10
Choose which curve the control should regulate according to.
> Offset curve Settings:
Standard setting:
Description:
-15  10 ºC
0 ºC
It is possible to set an offset to the curve, to fit it to the heating
need of the house.
> Demand Description: Curve control of heating the supply air is chosen, where the
supply air temperature is controlled by the outside
temperature and not by the current room temperature.
> Min. supply air temp. Settings:
Standard setting:
Description:
5  40 ºC
20 ºC
Minimum supply air temperature, overrides curve control.
> Max. supply air temp. Settings:
Standard setting:
Description:
20  50 ºC
40 ºC
Maximum supply air temperature, overrides curve control.
> Outdoor. temp.
compensation
Settings:
Standard setting:
Description:
0  10
10
Choose which curve the control should regulate according to.
> Offset curve Settings:
Standard setting:
Description:
-15  10 ºC
0 ºC
t is possible to set an offset to the curve, to fit it to the heating
need of the house.
> Offset temp. regl. Settings:
Standard setting:
Description:
0  2 ºC
0 ºC
It is possible to set an offset, so that the after heating element
turn on later.
> Delay Settings:
Standard setting:
Description:
0  30 minutes
10 minutes
Set a delay for when the after heating element may switch on
after a heating demand has been determined.

16
Heating curve
Max. temperature
Min. temperature
Supply air temperature
Outdoor temperature
20
-20-15-10-505101520
30
40
50
60
70
80
90
100
1
2
3
4
6
7
8
9
10
5

17
Domestic hot water
Settings for hot water production have been set at the factory, but it may be necessary to adjust them to match the user´s needs.
> Domestic hot water
After heating element
This menu item is only visible if an electric or water after heating element is installed and activated under Service settings.
If it is desired to control the supply air temperature it is necessary to install an after heating element. That allow you to control the sup-
ply air temperature independently of the outdoor temperature. The after heating element can also contribute to heating the home.
An electric or water heating element can be ordered for installation in the supply air duct.
> After heating element
> Electric supplement heater hot
water
Settings:
Standard setting:
Description:
Off / 5  85 ºC
30 ºC
Off: The electricity supplement is de-activated by the user.
5 - 85 ºC: Indicates below which temperature (T11) the
electricity supplement should help by heating the hot water.
> Hot water temperature Settings:
Standard setting:
Description:
Off / 5  60 ºC
45 ºC
Off: The hot water production is switched off by the user.
5 - 60 ºC: Indicates below which temperature (T12) the
compressor must produce hot water.
> Scalding protection Settings:
Standard setting:
Description:
60  80 ºC
65 ºC
When the unit is in heating or cooling mode, heat will simultane-
ously be deposited in the hot water tank.
To prevent the hot water from getting too hot and scalding the
user, a limit of 65ºC has been inserted. When the temperature in
the hot water tank reaches 65 ° C, cooling or heating the supply
air stops.
NB! If a scalding valve is connected to the bottom of the hot
water tank, the setting can be changed up to 80ºC. In this way,
the capacity for cooling and heating of the supply air is
increased.
ATTENTION
An after heating element is not standard, but can be purchased as an accessory, and can also be retrofitted if desired.
> Activate Settings:
Standard setting:
Description:
Off / On
Off
You can turn the after-heating on or off here.

18
Cooling
The unit can cool the dwelling via bypass-cooling and/or active cooling via the heat pump. For the unit to switch to cooling mode it must
operate in summer mode, or you must activate cooling in “Operating function”.
Bypass cooling:
If the room temperature, measured in the extract air, is higher than the cooling setpoint -2 ºC and the outdoor temperature is below
the room temperature, the bypass will open and commence bypass cooling.
The bypass will close again once the room temperature reaches the desired level + 1 ºC
If the outdoor temperature exceeds the room temperature and cooling becomes necessary, the bypass will not open. However, the
unit will start cooling recovery via the heat exchanger where the outdoor air is cooled by the extract air.
Active cooling:
If the room temperature (measured in the extract air) is higher than the desired room temperature + the cooling setpoint, the compres-
sor will start up and begin active cooling of the supply air. The compressor will stop when the room temperature falls below the cooling
setpoint -1ºC.
> Cooling
*When domestic hot water is needed, the heat pump will run at a higher level, and cannot simultaneously perform active cooling during
that period. However, it will open the bypass damper if cooling is required.
If cooling is to have a higher priority than hot water, the unit will cool the supply air and store the heat in the hot water tank during that
period. The domestic hot water will be heated, but not as quickly as usual in hot water production.
> Cooling setpoint Settings:
Standard setting:
Description:
Off / +1 / +2 / +3 / +4 / +5 / +7 / +10 ºC
Off
Off: Active cooling is deactivated.
Set point + X ºC: Indicates when active cooling is to start. The
set point for desired room temperature is selected on the front
of the panel.
> Ventilation in cooling mode Settings:
Standard setting:
Description:
Off / 2 / 3 / 4
Off
Off: The fan speed level does not change when the unit switches
to cooling mode.
Level 2-4: Select the fan speed level you want the unit to switch
to when in cooling mode. This happens already at bypass cool-
ing.
>Priority Settings:
Standard setting:
Description:
Water / Supply air
Water
This indicates whether the cooling function is to have a higher
priority than production of domestic hot water*.

19
Air humidity
The primary purpose of ventilation is to extract humidity from the house so it does not damage the building, and to achieve a good in-
door climate. During long periods with sub-zero temperatures, air humidity in the house may fall to a level that is critical for the build-
ing and for the indoor climate. Wooden floors, furniture and walls can be damaged by very dry air, which also whirls up dust, resulting
in a poor indoor climate.
This is rectified by an integrated humidity control system that maintains good, relative air humidity. When the average air humidity in
the house falls below a set level (default set at 30%), ventilation may be reduced. It will typically only be for a short period of time. This
will help avoid further reduction of the air humidity in the house.
The humidity control system also has a function that allows increased ventilation, should the air humidity increase, for instance when
having a bath. The risk of mould growth in the bathroom is reduced, and the bathroom mirror will rarely steam up.
The humidity control system follows the average air humidity level measured over the previous 24 hours. In this way the system au-
tomatically adapts to summer and winter conditions.
> Air humidity
> Vent.low humidity Settings:
Standard setting:
Description:
Level 1 / Level 2 / Level 3 / Level 4 / Off
Level 1
When the current humidity drops below the low humidity level,
the ventilation unit switches to the set ventilation level.
Off means that the ventation at low humidity is de-activated.
> Low humidity level Settings:
Standard setting:
Description:
15  45%
30%
When current humidity below this value falls, the ventilation
level set above is activated.
> Vent.high humidity Settings:
Standard setting:
Description:
Level 2 / Level 3 / Level 4 / Off
Level 3
At high humidity levels, for instance when having a bath, the
unit changes to the set fan speed level.
Off means that the function Ventilation at high humidity is de-
activaded.
> Max time high humidity Settings:
Standard setting:
Description:
1  180 min. / Off
60 min.
The function “High humidity” stops when actual humidity falls
below 3% above the average air humidity.
However, this time limit will stop operation if it fails within the
set time period.
Off means that the function Max. time at high humidity is de-
activated.

20
CO2 Control
This menu is only displayed if a CO2-sensor has been installed, and the function has been chosen under Service settings.
If the number of people using a building varies considerably, controlling ventilation through the CO2 level in the extract air may be a
good solution. This function is often used in offices and schools where use varies greatly during the day and during the week.
> CO2
Air exchange
Low humidity in the dwelling can be prevented by reducing ventilation at low outdoor temperatures. This function can be used in coun-
tries with regular sub-zero temperatures and at high altitudes where the outdoor air is very dry
> Air exchange
ATTENTION
A CO2 sensor is not a standard part of all ventilation units, but may be purchased as an accessory.
> Vent.high CO2 level Settings:
Standard setting:
Description:
Level 2 / Level 3 / Level 4 / Off
Level 3
Here you set the fan speed level at which the unit is to operate
at high CO2 level.
Off means the this function is de-activated.
> High CO2 level Settings:
Standard setting:
Description:
650  2500 ppm
800 ppm
Here you set the CO2 level at which the unit is to switch to high
fan speed level.
> Normal CO2 level Settings:
Standard setting:
Description:
400  700 ppm
600 ppm
Here you set the CO2 level at which the unit is to switch to
normal fan speed level.
> Low temp. compressor start Settings:
Standard setting:
Description:
Off / 0  15 °C
Off
Here you indicate whether, at low outdoor temperatures, the
heat pump is to start up even if heating is not required.
Off means that the function is de-activated
> Winter low vent. Settings:
Standard setting:
Description:
Level 1 / Level 2 / Level 3 / Off
Off
Here you select the fan speed level at which the unit is to oper-
ate at low outdoor temperatures.
Off means that the function is de-activated
> Level winter low Settings:
Standard setting:
Description:
-20  40 °C
0 °C
Here you indicate the outdoor temperature at which operation
is to change to "Winter low".