SOFTWARE INSTRUCTIONS

  CTS400 BY NILAN

Comfort

Version 1.30- 20.01.2025
S75 Comfort GB
Table of contents

Control panel

     Functions on the control panel .................................................................................................................................................................. 3
          Functional overview ............................................................................................................................................................................. 3
          Warnings and alarms ............................................................................................................................................................................ 4
          Damper test ........................................................................................................................................................................................... 6
          Control panel locked ............................................................................................................................................................................. 6

PC Tool

     Installation .................................................................................................................................................................................................... 7
          Installation of PC Tool ........................................................................................................................................................................... 7

     Settings in PC Tool ....................................................................................................................................................................................... 9
          Menu bar ................................................................................................................................................................................................. 9
          PI diagram ............................................................................................................................................................................................... 9

Software

     Connection options .................................................................................................................................................................................. 10
          Overview of connection options ..................................................................................................................................................... 10

     Balancing .................................................................................................................................................................................................... 11
          Balancing ............................................................................................................................................................................................. 11

     Basic settings ............................................................................................................................................................................................ 11
          Temperature settings ....................................................................................................................................................................... 11
          Humidity control system .................................................................................................................................................................. 12
          Filter alarm .......................................................................................................................................................................................... 13
          Bypass Summer mode ...................................................................................................................................................................... 13
          Settings ................................................................................................................................................................................................ 14
          Fan speed % ........................................................................................................................................................................................ 17
          User selection 2 .................................................................................................................................................................................. 18

     Advanced settings .................................................................................................................................................................................... 19
          De-icing function ................................................................................................................................................................................ 19
          CO2 regulation .................................................................................................................................................................................... 20
          Lock control panel .............................................................................................................................................................................. 21
          Modbus ID ............................................................................................................................................................................................ 21
          Manual test ......................................................................................................................................................................................... 22
          Control panel ...................................................................................................................................................................................... 22
          List of Alarms ...................................................................................................................................................................................... 22
          List of Info Alarms .............................................................................................................................................................................. 22

Alarm list

     Comfort ...................................................................................................................................................................................................... 23

                                                                                               2
Control panel

Functions on the control panel

Functional overview

                                                                     The following functions are available with the CTS 400 panel:
                                                                     1. Power on and off button
                                                                     2. Yellow LED light: Constantly flashing or lit by warnings or alarms
                                                                     3. Green LED light: The number of lit LED lights indicates the desired fan speed level
                                                                     4. Switching the fan speed level from 1-4 is done by pressing the arrow, after fan

                                                                           speed level 4 fan speed level 1 appears again.
                                                                                     ATTENTION
                                                                                     When the unit is overridden by user selection, humidity, defrost, etc., the
                                                                                     desired fan speed level will be lit green, but the current fan speed level will
                                                                                     flash. By pressing the arrow, the unit will go to the desired fan speed level -
                                                                                     until the next event.

                                                                                               3
Warnings and alarms

If an alarm is triggered in the ventilation unit, the yellow LED will flash. Alarms are divided into 3 categories: Information, warning and
critical alarm.

                  INFO
                  The alarm displays a piece of information that needs your attention, e.g. that filters need replacing.
                  The ventilation unit remains in operation.

                                                The yellow LED and the two lower green LED stays on:
                                                Filters need replacing.
                                                Replace filters and clean the unit.
                                                Resetting the filter alarm:
                                                Press the Level button (the button with the arrow) in 15 seconds.

                                                The yellow LED and the two green LED in the middle stays on:
                                                Release the Level button

                                                The yellow LED and the four green LED stays on in 10 seconds.:

                                                All LED turns off briefly.

                                                The two lower green LED stays on:
                                                The timer of the filter is resetted and the alarm is de-activated.

                                                                                               4
ATTENTION
The alarm displays a warning that needs your attention. The ventilation unit continues to operate, but in emergency
mode.

                             Alarm display:
                             Push briefly both the ON/OFF button and the Level button at the same time and release. After-
                             wards one of the green LED is flashing and indicate the type of fault:

                             The yellow diode and the first green diode are flashing:
                             The temperature sensor has either short-circuited or been disconnected.
                             Register the error and contact service. Reset the alarm once the error has been rectified.
                             Resetting the alarm:
                             Press the On/Off button and the button with the arrow at the same time and hold for 10 seconds.

                             The yellow diode and the second green diode are flashing:
                             The humidity sensor or the CO2 sensor has either short-circuited or been disconnected.
                             Register the error and contact service. Reset the alarm once the error has been rectified.
                             Resetting the alarm:
                             Press the On/Off button and the button with the arrow at the same time and hold for 10 seconds.

                             The yellow diode and the third green diode are flashing:
                             The thermostat in the after-heating has short-circuited or been disconnected.
                             Make a note of which sensor is faulty and contact service. Reset the alarm once the error has been
                             rectified.
                             Resetting the alarm:
                             Press the On/Off button and the button with the arrow at the same time and hold for 10 seconds.

                                                                             5
                  WARNING
                  The alarm displays a critical alarm that needs your attention.
                  The ventilation unit has stopped.

                                                The yellow diode and the first two green diodes are flashing:
                                                The fire alarm has been activated.
                                                If there is no fire, contact service. Reset the alarm once the error has been rectified.
                                                Resetting the alarm:
                                                Press the On/Off button and the button with the arrow at the same time and hold for 10 seconds.

                                                The yellow diode and the upper two green diodes are flashing:
                                                Frost in the water after-heating element (if installed)
                                                Contact service. Reset the alarm once the error has been rectified.
                                                Resetting the alarm:
                                                Press the On/Off button and the button with the arrow at the same time and hold for 10 seconds.

Damper test

If a fire automation system has been connected and it has been activated in PC Tool, it will run a damper test. The damper test lasts
approx. 3 minutes and it is carried out every 7/ 14 or 28 days (set in the Software). The test will also run every time the unit starts up
after having been turned off. When the test has been completed, the unit will continue in the defined settings.

                                                The 4 green LED lights range from 1-4:
                                                A damper test is carried out that take approx. 3 min .
                                                Resetting the alarm:
                                                The alarm stops automatically when the test has finished, and the control panel will once again dis-
                                                play the current fan speed level.

Control panel locked

You can lock the control panel in two different ways: The On/Off button and/or the button with the arrow.
                                                All LEDs flash temporarily:
                                                If all the LEDs flash temporarily when you use the panel, the panel has been locked.
                                                Contact the caretaker or service provider if that happens.
                                                Resetting alarms:
                                                You can still reset alarms.
                                                Press the On/Off button and the button with the arrow at the same time and hold for 10 seconds

                                                                                               6
PC Tool

Installation

Installation of PC Tool

Use a USB AB cable to connect the PC to the USB port on the unit. The recommended maximum cable length for the USB AB cable
used is 3 m.

You can download the PC application via NilanNet under the menu item “After Sales/Software”.

Install the latest software “Nilan PC-tool”
The program will be installed under: C:\Program Files (x86)\Nilan PC-tool

The example is for installation in Windows 10 (it may look different in other versions of Windows).

1. Press “Next” to install Nilan PC-tool  2. Tick the box for accepting the       3. Press “Next” to confirm the location
                                          license agreement and press “Next”      of the program

4. Confirm the location of the pro-       5. Press “Finish” to run Nilan PC-tool  6. Press “Yes” to accept the user
gram. Select the option “all users” and                                           license agreement for the software
press “Next”

7. Press “Next” to install Automated      8. Press “Next” to start installation   9. Press “Next” to confirm the location
Solutions Modbus Master ActiveX                                                   of the program
Control on the PC

                                          7
10. Press “Next” to add the program to  11. Press “Next” to start installation  12. Press “Finish” to complete installa-
Program Manager Group                                                           tion

  13. Information about successful
  installation

Setup in the program

1. Following installation, you have to  2. Go to the sheet “Compatibility” and  3. Tick “Run this program as adminis-
set a number of settings in the pro-    tick “run this program as administra-   trator” and press “OK”
gram.                                   tor”. Then, press the bar at the bot-
Under C:\Program Files (x86)\Nilan      tom: “Change settings for all users”
PC-tool you have to right-click         and press “OK”
DataloggerModbus

                                        8
Settings in PC Tool

Menu bar

In the menu bar at the top of the diagram, the following menus are available: Exit, Language, Configuration, Login, Firmware and Start/
Stop connection.

Exit                   The program closes
Language
                       The default language for the ventilation unit is Danish. You can change it to other languages in the
Configuration          menu

Login                  You can save set values and settings in PC-Tool and transfer them to e.g. a different unit or simply save
Firmware               them for later use.
Start/Stop connection
                       Login access to default settings

                       Software update

                       If the connection to the unit is disrupted, you can reestablish it here.

PI diagram

Key for reading the following values in the PI diagram:

When the green button flashes (at the centre of the counterflow heat exchanger), there is a connection to the ventilation unit.

Software:   Software version

Bypass damper: Open or closed

Supply air [%]: Supply air fan (supply air)

            Level: Fan speed level

Extract air [%]: Extract air fan (extract air)

            Level: Fan speed level

T1: Outdoor air temperature
T2: Supply air temperature (does not figure in all ventilation units)
T3: Extract air temperature
T4: Discharge air temperature
T7: Supply air temperature (if an after-heating element has been installed)
RH%: Humidity sensor in extract air
CO2: CO2 level in ppm
VOC: Air quality measurement

                                                         9
Software

Connection options

Overview of connection options

You can connect external accessories to the ventilation unit. However, it is not possible to have all accessories connected up simulta-
neously.
The following table shows the external connections that are possible in the different settings.

Setting                   User selection 1  User selection 2 /  Fire thermostat  VOC / CO2      Alarm output
                                            Filter monitor                                   X              X
Normal                    X                                                 X
                                                        X                   X
                                                                            X
Water after-heating       X                                                 X

Electrical after-heating  X

Fire automation system    X

                                            10
Balancing

Balancing

To ensure a correct balancing, it is imprtant that the unit is in balancing mode. In this way all other functions such as e.g. humidity con-
trol system are deactivated to ensure a correct balncing.

Balancing                      Settings:              0/1
                               Standard setting:      0
                               Description:           1 indicates that the function “Balancing” has been activated.

Basic settings

Temperature settings

If an after-heating element has not been installed, the settings are used to control the bypass damper.

It is necessary to install an after-heating element if you want to control the supply air temperature and for it to contribute towards the
heating of the dwelling. An after-heating element enables you to control the supply air temperature, regardless of the outdoor tem-
perature.

An external after-heating element can be mounted in the supply air duct. This, however, is not an option if the Fire automation system
function is being used.

Stop at low room temperature
You can set a minimum room temperature at which the ventilation unit is to stop (Room low temperature).

This is a safety function that can be useful, for instance, if you are not at home and the heat supply stops. In such an event, the dwelling
will no longer be heated and the room temperature will fall. To prevent the ventilation unit from cooling the dwelling even further, you
can set it to stop at a minimum room temperature.

                  ATTENTION
                  During periods when heating is not required in the dwelling, the supply air temperature may fall below the minimum
                  temperature.

Desired room temperature       Settings:              0  28 °C
Regulatory-deadband            Standard setting:      20 °C
                               Description:           Here you set the desired room temperature.

                               Settings:              0  4 °C
                               Standard setting:      1 °C
                               Description:           The temperature setting is deducted from or added to the regu-
                                                      latory-deadband of the setpoint.
Stop at room low temperature:  Settings:
0=Off                          Standard setting:      0 / 1  20°C
                               Description:           0
                                                      Here you set the room temperature at which the ventilation
Summer/winter mode             Settings:              unit is to stop.
                               Standard setting:
                               Description:           5  30 °C
                                                      12 °C
                                                      Here you set the temperature for the shift to and from summer
                                                      and winter mode.

                                                      • If the outdoor temperature is higher, the unit will operate in
                                                         summer mode

                                                      • If the outside temperature is lower, the unit will operate in
                                                         winter mode

                                                  11
Humidity control system

The primary purpose of ventilation is to extract humidity from the dwelling to avoid damage to the building, and to achieve a good in-
door climate. During long periods with sub-zero temperatures, humidity levels in the dwelling may become critically low for the build-
ing and for the indoor climate. Wooden floors, furniture and walls can get damaged from very dry air, which also whirls up dust,
resulting in a poor indoor climate.

To prevent this, the control system has an integral humidity control system that maintains a healthy, relative humidity level. When the
average air humidity level in the dwelling falls below a set value (default setting is 30%), you can choose to reduce ventilation. It will
typically only last for a short period of time. In this way, you can prevent further reduction of the air humidity level in the dwelling.

The humidity control system also has a function that enables you to increase ventilation if the air humidity level becomes high, for in-
stance when running a bath. This reduces the risk of mould growth in the bathroom, and, as an added bonus, 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.

Fan speed level at low humidity   Settings:              0/1/ 2/3
level                             Standard setting:      1
                                  Description:           When the current humidity level falls below the level that signi-
                                                         fies low air humidity, the ventilation unit will change to the set
Fan speed level at high humidity  Settings:              fan speed level.
level                             Standard setting:
                                  Description:           0 indicates that the function “Fan speed level at low humidity
                                                         level” has been deactivated.
Low humidity level [%]            Settings:
Time out high humidity level      Standard setting:      2/3/4/0
                                  Description:           3
                                                         At high air humidity, for instance when running at bath, the ven-
                                  Settings:              tilation unit will change to the set fan speed level.
                                  Standard setting:
                                  Description:           0 indicates that the function “Fan speed level at high humidity
                                                         level” has been deactivated.

                                                         15  45%
                                                         30%
                                                         When the current air humidity level falls below this value, “Fan
                                                         speed level at low humidity level” will be activated.

                                                         0  180 min.
                                                         60 min .
                                                         The function “Fan speed level at high humidity level” ordinarily
                                                         stops when the current air humidity level is 3% above the aver-
                                                         age humidity level.

                                                         The time limit will, however, stop operation if it has not been
                                                         achieved within the set amount of time.

                                                         0 indicates that the function has been deactivated.

                                                     12
Filter alarm

                  ATTENTION
                  It is important to change the filters regularly as required. Dirty filters reduce the efficiency of the ventilation unit and
                  result in a poorer indoor climate and higher power consumption.

The default setting of the filter alarm is 90 days between filter replacements. You can set the timer so it fits the level of pollution in the
location where the ventilation unit has been installed.

If someone in the household has a pollen allergy, it is recommended that you install a pollen filter in the outdoor air intake.

Days between filter replace-       Settings:              0  360
ments                              Standard setting:      90 days
                                   Description:           Here you set the amount of days between filter replacements.
Filter alarm on the panel: 0=None
                                   Settings:              0/1
                                   Standard setting:      1
                                   Description:           Here you indicate whether or not an alarm is to be displayed on
                                                          the panel

Bypass Summer mode

In the summer time when it is hot the unit can be set to run a higher air exchange.

Bypass Boost Trin: 0= Off          Settings:              04
Bypass Boost Offset                Standard setting:      Off
                                   Description:           Set the fan level speed which has to be used for Bypass mode in
                                                          the summer time.
                                   Settings:
                                   Standard setting:      0.0  10.0
                                   Description:           0,0
                                                          Set additional temperatur at which, above set temperatur,
                                                          increased ventilation must be activated.

                                                      13
Settings                           Settings:          14
                                   Standard setting:  1
  Select setting:                  Description:       Here you can select settings related to Normal operation, Water
  1=Normal                                            / electrical after-heating or Fire automation system
  2=Water after-heating
  3=Electrical after-heating
  4=Fire automation system

1=Normal                           Description:       Here you select normal setting

Fan speed level user selection 1:  Settings:          04
0=Function off                     Standard setting:  0
1-4= fan speed level 1-4           Description:       Here you select the desired fan speed level when user selection
                                                      1 is activated.
Time out user selection 1:         Settings:
Stop after min. (0=Off)            Standard setting:  0  180 min.
                                   Description:       0
                                                      Here you select for how long user selection 1 is to remain active
Fire thermostat reset:             Settings:          after it has been activated.
0=Manual / 1=Automatic             Standard setting:
                                   Description:       0: User selection 1 remains active as long as the potential signal
Additional input: 0=Off                               is closed.
1=User selection 2 / 2= Filter     Settings:          1-180: User selection 1 is deactivated automatically after the
monitor                            Standard setting:  selected amount of time (in minutes).
                                   Description:
Additional sensor:                                    This is used, for instance, in sheltered housing for old people
0=Ingen / 1= VOC / 2=CO2           Settings:          where residents might forget to turn off the cooker hood.
                                   Standard setting:
                                   Description:       0/1
                                                      0
Output: 0=Off                      Settings:          Fire: Automatic confirmation when fire input is back to normal.
1=10V alarm / 2=0-10V alarm /      Standard setting:
3=10V with fan /                   Description:       02
4= User selection 1                                   0
                                                      Here you activate user selection 2 or input from the filter moni-
                                                      tor.

                                                      02
                                                      0
                                                      Here you indicate whether a VOC sensor or a CO2 sensor has
                                                      been installed.

                                                      04
                                                      0
                                                      Here you indicate whether the output signal is to communicate
                                                      alarms to e.g. a lamp / operation of the unit, or it should be acti-
                                                      vated by user selection 1.

2=Water after-heating element Settings:                   Here you indicate whether or not a water after-heating ele-
                                                          ment has been installed.
Fan speed level user selection 1:  Settings:
0=Function off                     Standard setting:      04
1-4= fan speed level 1-4           Description:           0
                                                          Here you select the desired fan speed level when user selection
Time out user selection 1:         Settings:              1 is activated.
Stop after min. (0=Off)            Standard setting:
                                   Description:           0  180 min.
                                                          0
                                                          Here you select for how long user selection 1 is to remain active
                                                          after it has been activated.

                                                          0: User selection 1 remains active as long as the potential signal
                                                          is closed.
                                                          1-180: User selection 1 is deactivated automatically after the
                                                          selected amount of time (in minutes).

                                                          This is used, for instance, in sheltered housing for old people
                                                          where residents might forget to turn off the cooker hood.

                                                      14
Fire thermostat reset:             Settings:              0/1
0=Manual / 1=Automatic             Standard setting:      0
                                   Description:           Fire: Automatic confirmation when fire input is back to normal.
Status of frost thermostat
0=Ok / 1=Error                     Description:           Shows status of the frost thermostat in the water after-heating
                                                          element. If there is an error, there is a risk of frost in the water
Status of after-heating element    Description:           after-heating element.
[%]
                                   Settings:              Shows the current output of the water after-heating element.
Minimum supply air                 Standard setting:
temperature                        Description:           10.0  20.0 °C
                                                          16.0
Maximum supply air                 Settings:              Here you set the minimum supply air temperature that you
temperature                        Standard setting:      want the ventilation unit to give off when heating is required in
                                   Description:           the dwelling.

3=Electrical after-heating         Settings:              If heating is not required, the supply air temperature may fall
                                                          below this value.
Fan speed level user selection 1:  Settings:
0=Function off                     Standard setting:      10.0  50.0 °C
1-4= fan speed level 1-4           Description:           25
                                                          Here you set the maximum supply air temperature that you
Time out user selection 1:         Settings:              want the ventilation unit to give off when heating is required in
Stop after min. (0=Off)            Standard setting:      the dwelling.
                                   Description:
                                                          Here, you indicate whether or not an electrical after-heating
Fire thermostat reset:             Settings:              element has been installed.
0=Manual / 1=Automatic             Standard setting:
                                   Description:           04
Status of thermostat to prevent                           0
overheating:                       Description:           Here you select the desired fan speed level when user selection
0=Ok / 1=Error                                            1 is activated.

Status of after-heating element    Description:           0  180 min.
[%]                                                       0
                                   Settings:              Here you select for how long user selection 1 is to remain active
Minimum supply air                 Standard setting:      after it has been activated.
temperature                        Description:
                                                          0: User selection 1 remains active as long as the potential signal
                                                          is closed.
                                                          1-180: User selection 1 is deactivated automatically after the
                                                          selected amount of time (in minutes).

                                                          This is used, for instance, in sheltered housing for old people
                                                          where residents might forget to turn off the cooker hood.

                                                          0/1
                                                          0
                                                          Fire: Automatic confirmation when fire input is back to normal.

                                                          Shows status of thermostat to prevent overheating

                                                          Errors indicate that the after-heating element has been too hot,
                                                          which may be due to insufficient air flow across the element.

                                                          NB: Nilan’s electrical after-heating elements have an integral
                                                          thermostat to prevent overheating. It is therefore not included
                                                          in this outline.

                                                          Shows the current output of the electrical after-heating ele-
                                                          ment.

                                                          10.0  20.0 °C
                                                          16.0
                                                          Here you set the minimum supply air temperature that you
                                                          want the ventilation unit to give off when heating is required in
                                                          the dwelling.

                                                          If heating is not required, the supply air temperature may fall
                                                          below this value.

                                                      15
Maximum supply air               Settings:              10.0  50.0 °C
temperature                      Standard setting:      25
                                 Description:           Here you set the maximum supply air temperature that you
                                                        want the ventilation unit to give off when heating is required in
4=Fire automation system         Settings:              the dwelling.

Fan speed level user selection   Settings:              Here you indicate whether or not you wish to use the Fire auto-
1:                               Standard setting:      mation system.
0=Function off                   Description:
1-4= fan speed level 1-4                                04
                                 Settings:              0
Time out user selection 1:       Standard setting:      Here you select the desired fan speed level when user selection
Stop after min. (0=Off)          Description:           1 is activated.

Fire thermostat reset:           Settings:              0  180 min.
0=Manual / 1=Automatic           Standard setting:      0
                                 Description:           Here you select for how long user selection 1 is to remain active
Fire damper closed               Description:           after it has been activated.
(1=fully closed)
                                 Description:           0: User selection 1 remains active as long as the potential signal
Fire damper open                                        is closed.
(1=fully open)                   Description:           1-180: User selection 1 is deactivated automatically after the
                                                        selected amount of time (in minutes).
Status of fire damper            Settings:
0=Ok / 1=Error                   Standard setting:      This is used, for instance, in sheltered housing for old people
                                 Description:           where residents might forget to turn off the cooker hood.
Intervals between tests of fire
damper                                                  0/1
in days: 0=7 / 1=14 / 2=28                              0
                                                        Fire: Automatic confirmation when fire input is back to normal.
Polarity of fire input:          Settings:
0=NO, 1=NC                       Standard setting:      Shows whether the fire damper is closing or is fully closed
                                 Description:
                                                        Shows whether the fire damper is opening or is fully open

                                                        Shows status of fire damper

                                                        02
                                                        2
                                                        Here you set the desired amount of days before the fire damper
                                                        is to be tested again.

                                                        0/1
                                                        0
                                                        The fire input for the fire thermostat should be:
                                                        0: Normally open
                                                        1: Normally closed

                                                    16
Fan speed %

It is a fast and easy process to balance the air volume using the Nilan CTS400 control system. You can set all fan speed levels between
20 and 100% (stepless). The levels can differ in extract air and supply air.

                    ATTENTION
                    Be sure to set regulation to “1” in PC Tool Software settings and remember to restore “0” after regulation.

Supply air - level 1   Settings:              20  100%
Supply air - level 2   Standard setting:      23%
Supply air - level 3   Description:           Here you set the fan speed level for Level 1 - Supply air.
Supply air - level 4
Supply air - level 5   Settings:              20  100%
                       Standard setting:      40%
Supply air - level 6   Description:           Here you set the fan speed level for Level 2 - Supply air.

Extract air - level 1  Settings:              20  100%
Extract air - level 2  Standard setting:      65%
Extract air - level 3  Description:           Here you set the fan speed level for Level 3 - Supply air.
Extract air - level 4
Extract air - level 5  Settings:              20  100%
                       Standard setting:      100%
Extract air - level 6  Description:           Here you set the fan speed level for Level 4 - Supply air.

                       Settings:              20  100%
                       Standard setting:      100%
                       Description:           Here you set the fan speed level for Level 5 - Supply air.
                                              This level must be selected in User selection and can not be
                       Settings:              selected in control panel.
                       Standard setting:
                       Description:           20  100%
                                              100%
                       Settings:              Here you set the fan speed level for Level 6 - Supply air.
                       Standard setting:      This level must be selected in User selection and can not be
                       Description:           selected in control panel.

                       Settings:              20  100%
                       Standard setting:      25%
                       Description:           Here you set the fan speed level for Level 1 - Extract air.

                       Settings:              20  100%
                       Standard setting:      45%
                       Description:           Here you set the fan speed level for Level 2 - Extract air.

                       Settings:              20  100%
                       Standard setting:      70%
                       Description:           Here you set the fan speed level for Level 3 - Extract air.

                       Settings:              20  100%
                       Standard setting:      100%
                       Description:           Here you set the fan speed level for Level 4 - Extract air.

                       Settings:              20  100%
                       Standard setting:      100%
                       Description:           Here you set the fan speed level for Level 5 - Extract air.
                                              This level must be selected in User selection and can not be
                                              selected in control panel.

                                              20  100%
                                              100%
                                              Here you set the fan speed level for Level 6 - Extract air.
                                              This level must be selected in User selection and can not be
                                              selected in control panel.

Nilan recommends the following settings for the individual fan speed levels:
Level 1: "Holiday ventilation" - is used when you are away on holiday, but also for "Humidity low"
Level 2: "Basic ventilation" - is used for standard operation
Level 3: "Visitor ventilation" - is used when you have visitors, but also for "High humidity level"
Level 4: "Party ventilation" - is used when many people are gathered in the dwelling, but also for "Cooker hood function"
Level 5: User selection 1 or 2 (Cooker hood)
Level 6: User selection 1 or 2 (Cooker hood)

                                          17
User selection 2

If you have chosen user selection 2 in settings, you can change the fan speed level and the time settings.

Fan speed level user selection 2:  Settings:              04
0=Function off                     Standard setting:      0
                                   Description:           Here you select the desired fan speed level when user selection
                                                          2 is activated.
Time out user selection 2:         Settings:
Stop after min.                    Standard setting:      0  180 min.
(0=User selection 2 Off)           Description:           0 (Must be set to a min. of 1 minute)
                                                          Here you select for how long the program is to continue running
                                                          after the external signal is released.

                                                      18
Advanced settings

De-icing function

In all ventilation units with a heat exchanger with high-efficiency heat recovery ice may form in the heat exchanger during periods of
heavy frost. The de-icing function will try to de-ice the exchanger so that normal operation can continue.

You can prevent ice formation in the heat exchanger by installing a pre-heating element for frost protection. This ensures continuous
operation without cold draughts or coldness.

It is recommended that you install a pre-heating element for frost protection if you are in a location with very frosty winters.

Start de-icing T4                Settings:              1  5 °C
                                 Standard setting:      3 °C
                                 Description:           Here you select at which discharge air temperature (T4) de-
                                                        icing is to begin.
Stop de-icing T4                 Settings:
                                 Standard setting:      5  10 °C
                                 Description:           7 °C
                                                        Here you select at which discharge air temperature (T4) de-
Max. de-icing time [min.]        Settings:              icing is to stop.
                                 Standard setting:
                                 Description:           5  60 min.
                                                        15 Min .
Time between de-icing processes  Settings:              Here you set the maximum time allowed for de-icing the coun-
[min.]                           Standard setting:      terflow heat exchanger.
                                 Description:
                                                        15  760 min.
                                                        60 min .
                                                        Her you set the minimum time that has to pass between
                                                        individual de-icing processes.

                                                    19
CO2 regulation

This menu item only appears if a CO2sensor has been installed and the function has been selected in CO2 - regulation.

                    ATTENTION
                    CO2-sensor is only mountable in Normal settings

If the numbers of people using the building/rooms is inconsistent, it can be a good idea to regulate ventilation in accordance with the
CO2-level in extract air. This funtion is often used in officies and schools where the concentration og people varies greatly during the
day and during the week.

CO2 regulation                        Settings:          0/1
                                      Standard setting:  0
                                      Description:       Her you can select if the ventilation is controlled according to
                                                         the CO2-level measured in the extract air.
   >1                                 Description:       0: No
      > Fan speed level at high CO2-                     1: Yes
      level                           Settings:
                                      Standard setting:  CO2-measuring is chosen to control the ventilation.
      > High CO2-level                Description:
                                                         1/ 2/3/4
      > Fan speed level for Nobody    Settings:          4
      home                            Standard setting:  Here you set the fan speed level for ventilation unit by high
                                      Description:       CO2-level.
      > Nobody home limit
                                      Settings:          500 - 2000 ppm
      >Fan runtime                    Standard setting:  800
                                      Description:       Here you set the level for high CO2-level.
CO2 Mode 0-3
                                      Settings:          1/ 2/3/4
   >0                                 Standard setting:  1
   >1                                 Description:       (not Austria) Here you set the fan speed level for ventilation
                                                         unit by low CO2-level.
      > Nobody home standby           Settings:
                                      Standard setting:  400-500 ppm
                                      Description:       450
                                                         Here you set the level for low CO2-level.
                                      Settings:
                                      Standard setting:  5 - 20 min
                                      Description:       5 min
                                                         (Only Austria) If the function ”Nobody home standby” is active,
                                      Description:       the fan will be runing once an hour during the selected period.

                                      Description:       0/1/2/3
                                                         0
                                      Settings:          Here you set the basic setting for Co2 measurements according
                                      Standard setting:  to which the ventilation must be regulated.
                                      Description:
                                                         CO2 sensor is off (default)
>2                                    Description:
                                                         The ventilation is regulated according to CO2 measurements
                                                         for high CO2 -level and basic setting ”High ventilation”

                                                         0/1
                                                         0
                                                         (Only Austria) Here you choose if the regulation of the ventila-
                                                         tion according to the CO2 measurements is paused when
                                                         nobody is home.
                                                         O: No (default)
                                                         1: Yes

                                                         The ventilation is regulated according to CO2 measurements
                                                         for low CO2 -level and basic setting ”Nobody home”

                                                         20
   > Nobody home standby        Settings:          0/1
>3                              Standard setting:  0
                                Description:       (Only Austria) Here you choose if the regulation of the ventila-
                                                   tion according to the CO2 measurements is paused when
                                Description:       nobody is home.
                                                   O: No (default)
                                                   1: Yes

                                                   The ventilation is regulated according to CO2 measurements
                                                   for both high CO2-level and law CO2-level and function ”High
                                                   ventilation” + ”Nobody home”.

Lock control panel              Settings:              0/1
                                Standard setting:      0
  Unit cannot turn off:         Description:           Here you can choose a setting that makes it impossible to turn
  0=Off / 1=On                                         off the ventilation unit via the control panel.
                                Settings:
  Fan speed cannot be changed:  Standard setting:      0/1
  0=Off /1=On                   Description:           0
                                                       Here you can choose a setting that makes it impossible to
                                                       change the fan speed level via the control panel.

Modbus ID

Nilan’s ventilation units have a control system with open Modbus communication. It enables you to control the unit with e.g. an external
CTS control system.

The CTS400 control system communicates Modbus RS485, and you can download the complete Modbus protocol from Nilan’s website.

Modbus address                  Settings:              1  247
                                Standard setting:      30
                                Description            Here you specify the Modbus address for the ventilation unit.

                                                   21
Manual test                    Settings:              A. Out / Bypass / Extract air fan / Supply air fan
                               Standard setting:      0
  Override output signal       Description:           Must be selected before the following output parameters can
                                                      be tested.
     Override supply air fan   Settings:
                               Standard setting:      0.0  100%
     Override extract air fan  Description:           50
                               Settings:              Manual setting of the speed level of the supply air fan.
     Test bypass damper:       Standard setting:
     0=Closed / 1=Open         Description:           0.0  100%
     Override analog output    Settings:              50
                               Standard setting:      Manual setting of the speed level of the extract air fan.
  Override input signal        Description:
                               Settings:              0/1
     Override average          Standard setting:      0
     air humidity level        Description:           Testing the bypass damper.
     Override RH value         Settings:
                                                      0  100
     Override CO2 level        Standard setting:      0
                               Description:           Testing the analog output signal.
     Override VOC level
                               Settings:              VOC / RH AVG 24 / CO2 / RH
     Override D1in value       Standard setting:      0
                               Description:           Must be selected before the following output parameters can
Control panel                  Settings:              be tested.
                               Standard setting:
  Stop unit                    Description:           0.0  100
  0=stop 1=operating           Settings:              50
  Fan speed level              Standard setting:      Here you can override the average air humidity level.
                               Description:
List of Alarms                                        0  120
                               Settings:              50
  Alarm codes 1, 2 and 3       Standard setting:      Here you can override the average air humidity level.
                               Description:
                               Settings:              0  2000
                               Standard setting:      600
                               Description:           If a CO2 sensor has been installed

                               Description:           0.0  2000
                                                      600
                               Description:           If a VOC sensor has been installed

                               Description:           0/1
                                                      0
List of Info Alarms            Description:           Testing User selection 1

  Info Alarms 1, 2 and 3                              Shows the operation mode which has been setted in the control
                                                      panel. It is also possible to set the levels in the software.

                                                      Shows the fan speed level set in control panel (1-4). It is also
                                                      possible to set the levels in the software.

                                                      Displays codes for the latest 3 alarms.

                                                      See outline of the alarm list for the meaning of the individual
                                                      code.

                                                      Displays codes for the latest 3 info alarms.

                                                      See outline of the alarm list for the meaning of the individual
                                                      code.

                                                  22
Alarm list

Comfort

The list below is for Comfort ventilation units with a CTS400 control system. Incidents are divided into the following
categories:

    Info                 Operation continues, but an incident has occurred that needs your attention.

    Warning              Operation continues, but an incident has occurred that needs your attention.
                         Briefly, press the On/Off button and the button with the arrow to get information about the alarm.

    Alarm                Operation has stopped completely as a serious error has occurred that requires immediate attention.

ID Type Name                          Display on the panel           Resetting and rectifying an error
                                      The yellow diode emits light   Clean/ replace filters.
1         Change filter                                              Reset alarm.
                                      None
15        De-icing time out                                          No resetting and rectification

16        Outdoor air temperature T1  The yellow diode emits light   Register the error and contact service. Reset

          disconnected                Green D1 is flashing           the alarm once the error has been rectified.

17        Outdoor air temperature T1  The yellow diode emits light   Register the error and contact service. Reset

          short-circuited             Green D1 is flashing           the alarm once the error has been rectified.

18        Supply air temperature sen- The yellow diode emits light   Register the error and contact service. Reset

          sor T2 disconnected         Green D1 is flashing           the alarm once the error has been rectified.

19        Supply air temperature sen- The yellow diode emits light   Register the error and contact service. Reset

          sor T2 short-circuited      Green D1 is flashing           the alarm once the error has been rectified.

20        Extract air temperature sen- The yellow diode emits light  Register the error and contact service. Reset

          sor T3 disconnected         Green D1 is flashing           the alarm once the error has been rectified.

21        Extract air temperature sen- The yellow diode emits light  Register the error and contact service. Reset

          sor T3                      Green D1 is flashing           the alarm once the error has been rectified.

          short-circuited

22        Discharge air temperature   The yellow diode emits light   Register the error and contact service. Reset

          sensor T4 disconnected      Green D1 is flashing           the alarm once the error has been rectified.

23        Discharge air temperature   The yellow diode emits light   Register the error and contact service. Reset

          sensor T4                   Green D1 is flashing           the alarm once the error has been rectified.

          short-circuited

24        Supply air temperature sen- The yellow diode emits light   Register the error and contact service. Reset

          sor T7 disconnected         Green D1 is flashing           the alarm once the error has been rectified.

25        Supply air temperature sen- The yellow diode emits light   Register the error and contact service. Reset

          sor T7 short-circuited      Green D1 is flashing           the alarm once the error has been rectified.

26        Humidity sensor (RH) error  The yellow diode emits light   Register the error and contact service. Reset

                                      Green D2 is flashing           the alarm once the error has been rectified.

27        CO2 sensor is signaling an  The yellow diode emits light   Register the error and contact service. Reset

          error                       Green D2 is flashing           the alarm once the error has been rectified.

                                      23
28  Frost thermostat in after-  The yellow diode emits light     Check that the water after-heating element

    heating disconnected or     Green D3 is flashing             and its connections have been insulated cor-

    short-circuited                                              rectly.

                                                                 Reset the alarm once the error has been recti-

                                                                 fied.

29  Risk of frost in after-heating The yellow diode emits light  Check that the water after-heating element

    element                     Green D3 is flashing             and its connections have been insulated cor-

                                                                 rectly.

                                                                 Reset the alarm once the error has been recti-

                                                                 fied.

48  Activating fire input       The yellow diode emits light     If there has been no fire, check the connection

                                Green D1 + D2 are flashing       to the fire thermostat.

                                                                 If it is working, contact service.

49  Fire                        The yellow diode emits light     Extinguish the fire and reset the alarm.
                                Green D1 + D2 are flashing

50  Frost in after-heating      The yellow diode emits light     Check that the water after-heating element

                                Green D3 + D4 are flashing       and its connections have been insulated cor-

                                                                 rectly.

                                                                 Reset the alarm once the error has been recti-

                                                                 fied.

51  The room temperature is too The yellow diode emits light     When the room temperature falls below the set

    low                         Green D3 + D4 are flashing       value (default set at 10 °C), the unit will stop in

                                                                 order to avoid further cooling of the dwelling.

                                                                 This may, for instance, be because the heating
                                                                 system in the dwelling has stopped. Heat the
                                                                 dwelling and reset the alarm.

52  Emergency stop              The yellow diode emits light
                                Green D3 + D4 are flashing

                                24
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                           Nilan A/S
                      Nilanvej 2
                  8722 Hedensted
             Danmark
         Tlf. +45 76 75 25 00
    nilan@nilan.dk
www.nilan.dk

Nilan A/S disclaims all liability for potential errors and omissions in printed instructions - or for loss or damages arising from published materials, whether these are due to errors or
inexpediency in the publications or they have other causes. Without prior notice Nilan A/S reserves the right to make changes to the products and instructions. All trademarks belong to
Nilan A/S. All rights reserved.
