BLAUBERG Ventilatoren S21 User manual

WIRELESS CONTROL SYSTEM
User’s manual
EN
S21

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Controller wiring diagram........................................................................................................................................................ 4
Connecting a mobile device to the unit ....................................................................................................................... 7
Unit password change .............................................................................................................................................................. 8
Wi-fi parameter setup ................................................................................................................................................................ 8
Special Setup mode..................................................................................................................................................................... 9
Cloud server connection.......................................................................................................................................................... 9
Home page ....................................................................................................................................................................................... 10
Control buttons.............................................................................................................................................................................. 11
Basic settings.................................................................................................................................................................................... 11
Connection ...................................................................................................................................................................................... 14
Engineering menu........................................................................................................................................................................ 15
Alarm/warning codes................................................................................................................................................................. 22
Mode priorities................................................................................................................................................................................ 24
This user’s manual is a main operating document intended for technical, maintenance, and operating staff.
The manual contains information about purpose and operating principle, design of the S21 unit and all its modifications.
Technical and maintenance staff must have theoretical and practical training in the field of ventilation systems and should be able to
work in accordance with workplace safety rules as well as construction norms and standards applicable in the territory of the country.
The information in this user’s manual was correct at the time of the document’s preparation.
The Company reserves the right to modify the technical characteristics of its products at any time in order to incorporate the latest
technological developments.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means in any information
search system or translated into any language in any form without the prior written permission of the Company.
CONTENTS

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CONTROLLER WIRING DIAGRAM
10 V IN RH
RH
VOC VOC
CO2
CO2
PM2.5
PM2.5
P1/Q1
T1 T2 T3 T4 T5 NKP TRIAC NKD TRIAC
P1Q1 P2Q2
P2Q2
GND
GND
1
2
3
4
Taho
Taho
GND
GND
GND
GND
0-10
Vcc
10 V
Out
10 V
Out
10 V
In
Su
In
Exh
Vcc
24 V
Vcc
24 V
Vcc
24 V
Vcc
24 V
Vcc
24 V
Vcc
24 V
0-10
0-10
0-10
0-10
0-10
0-10
GND
GND
GND
GND
GND
GND
GND
In
GND
In
GND
In
GND
In
GND
In In In Out Out Out Out In In
L
M M1
GND
A B
24 V
RS-485
M2 FILTER
220 V L1 L2 L3 L4 L5 NKD NKP VALVE1 VALVE2 KKB BPS
L
N
L
N
GND
In
L
N
L
N
NO
NO
NO
NO
NO
NO
NC
C
C
C
C
C
C
L
N
0 10V OUT
M
N L N
NTC
N L N L N L N L
L
220V 50Hz
10kOm
NTC
10kOm
10kOm
NTC
10kOm
NTC
L
N
10kOm
NTC
Rн Rн
– Electric shock hazard!

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Controller power supply: 100-250 V, 50 (60) Hz, maximum power consumption – 30 W.
Controller inputs
Input purpose Input type Signal type Designation Operation
logic Comments
Outdoor air temperature Analogue NTC 10 kOm T1 -40...+120 °C
Supply air temperature or temperature
downstream of the main air heater
Analogue NTC 10 kOm T2 -40...+120 °C
Extract air temperature Analogue NTC 10 kOm T3 -40...+120 °C
Exhaust air temperature Analogue NTC 10 kOm T4 -40...+120 °C
Return heat medium temperature Analogue NTC 10 kOm T5 -40...+120 °C
External set point adjuster Analogue 0-10 V 10 V IN Enables fan speed control by means of a potentiometer.
This input is enabled/disabled via the Engineering Menu
(sensors). The terminal is energised with 10 V.
Main humidity sensor Analogue 0-10 V RH Each of the sensors is enabled/disabled via the
Engineering menu. The sensors are energised with
24 V for powering external sensors. The power supply
overload protection is triggered by a short circuit or
a total current on the 24 V line in excess of 700 mA.
Once the overload protection is activated, the power is
restored only after a manual reset at the power supply
unit.
Main VOC sensor Analogue 0-10 V VOC
Main CO2sensor Analogue 0-10 V CO2
Main PM2.5 sensor Analogue 0-10 V PM2.5
Constant flow/pressure supply Analogue 0-10 V P1/Q1
Constant flow/pressure exhaust Analogue 0-10 V P2/Q2
Supply fan control Digital Open
collector/
dry contact
M1 (TACHO) NC The control feature can be configured to fan tach pulses
or an external dry contact, or disabled. You can also
program the number of tach pulses per fan revolution
and the alarm condition detection time.
Extract fan control Digital Open
collector/
dry contact
M2 (TACHO) NC
Supply filter contamination control Digital Dry contact FILTER (IN SU) NO
Extract filter contamination control Digital Dry contact FILTER (IN EXH) NO
Heat medium flow control Digital Dry contact L1 NC This input is enabled/disabled via the Engineering Menu.
Heat medium pressure control Digital ~220 V L2 NC This input is enabled/disabled via the Engineering Menu.
Fire alarm sensor Digital ~220 V L3 NC This input is enabled/disabled via the Engineering Menu.
Boost switch Digital ~220 V L4 NO This input is enabled/disabled via the Engineering Menu.
Fireplace switch Digital ~220 V L5 NO This input is enabled/disabled via the Engineering Menu.
Electric preheating thermostat (alarm) Digital ~220 V NKP TRIAC (IN) NC
Electric reheater thermostat (alarm) or
water heater capillary thermostat (alarm)
Digital ~220 V NKD TRIAC (IN) NC
Controller outputs
Output purpose Output type Signal type Designation Note
Supply fan control Analogue 0-10 V M1 (OUT 0-10) You can configure the minimum and the maximum value of the signal sent
to an active fan and the delay before switching to automatic control after
activating the unit.
Extract fan control Analogue 0-10 V M2 (OUT 0-10)
Analogue control of the reheater or
water heater valve control
Analogue 0-10 V 0-10V OUT (1) The operation of this output depends on the heater type selected via the
Engineering Menu:
Electric. The system controls an external circuit board which operates the
heater (e.g. multi-stage)
Water. 2-10 V valve control signal.
Analogue control of the bypass or
analogue control of the rotary heat
exchanger
Analogue 0-10 V 0-10V OUT (2) The operation of this output depends on the unit configuration.
Analogue control of the cooler Analogue 0-10 V 0-10V OUT (3) The operation of this output depends on the cooler type selected via the
Engineering Menu:
Discrete. Output inactive.
Analogue. The output will control the built-in or external cooler with its
own control circuit.
Recirculation control Analogue 0-10 V 0-10V OUT (4)
Electric preheater control External TRIAC control NKP TRIAC (OUT) PWM signal is modulated to an external TRIAC with a 10 second cycle.
Electric reheater control External TRIAC control NKP TRIAC (OUT) PWM signal is modulated to an external TRIAC with a 10 second cycle.
Electric preheater release Relay 3A,
=30 V/~250 V
NKP
Electric heater release or water heater
pump release
Relay 3A,
=30 V/~250 V
NKD
Supply damper actuator control and/or
supply fan frequency converter release
Relay 3A,
=30 V/~250 V
VALVE1

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Exhaust damper actuator control and/or
extract fan frequency converter release
Relay 3A,
=30 V/~250 V
VALVE2
Discrete control of the cooler Relay 3A,
=30 V/~250 V
KKB The operation of this output depends on the cooler type selected via the
Engineering Menu:
Discrete. The output will directly control the cooler.
Analogue. The output will be used for cooler release. You can configure the
minimum activation period and the minimum idle time before a subsequent
activation.
Discrete control of the bypass or
analogue control of the rotary heat
exchanger
Two relay
outputs
3A,
=30 V/~250 V
3A,
=30 V/~250 V
BPS The operation of this output depends on the unit configuration.
Discrete bypass:
Opening the bypass closes the BPS relay (C - NO) and opens the BPS relay
(C - NC).
Closing the bypass opens the BPS relay (C - NO) and closes the BPS relay
(C - NC).
Rotary heat exchanger:
Discrete. The output will directly control the actuator.
Analogue. The output will be used for actuator release.
The BPS relay (C - NO) is enabled.
Communication interfaces
RS-485 The terminal (RS-485) is energised with 24 DC V to power up to 16 external devices. The maximum current is 500 mA. Any current in excess
of 500 mA triggers the overload protection to automatically restore power once the load reverts to normal.
Wi-Fi The unit can be fitted with a 50 ohm remote antenna.

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CONNECTING A MOBILE DEVICE TO THE UNIT
The fan is controlled by the Blauberg AHU application on the mobile device.
The application is available for download at App Store, Play Market or via the QR code.
App Store download link Play Market download link
When starting the application, a message on the absence of communication with the fan appears on the screen if the device is not
connected to the unit.
By default, the unit operates as a Wi-Fi access point. After installing the application, connect the mobile device to the unit as to a Wi-Fi
access point (FAN: + 16 characters of the ID number) indicated on the control board and on the unit casing.
Wi-Fi access point password: 11111111.
Start the application and create a new connection.
1. Enter the application menu .
2. Select Connection - At Home from the menu.
3. If the mobile device is connected to the unit Wi-Fi access point directly without a router, select the Default connection. If connecting
via a router, first run a unit network search by pressing the button.
4. Select the connection with the necessary ID.
5. Edit the connection settings by pressing the button.
6. If necessary, change the connection name and create a new password for the unit (using the permissible symbols 0..9, a...z, A...Z). By
default the unit password is set to 1111.
7. Confirm the entry by pressing the button.

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UNIT PASSWORD CHANGE
Go to Menu ( ) - Connection - At Home.
1. Choose the connection and press .
2. Enter and confirm the password (valid characters: 0..9, a .. .z, A .. .Z).
3. Press Change Password.
WIFI PARAMETER SETUP
Go to Menu ()- Connection - Wi-Fi setup.
Press the Receive button to display the current Wi-Fi settings.
Select one of the Wi-Fi modes: Access point or Client.
Access point: access point mode without a home router. Up to 8
devices can be connected to the unit in this mode.
Select the desired security level for the Access point mode:
• Open: open Wi-Fi network without a password.
• WPA PSK: password-protected. Outdated encryption
technology, using the WPA protocol, which does not
guarantee complete security.
• WPA2 PSK: password-protected. The most secure type of data
encryption for modern network devices.
• WPA/WPA2 PSK: password-protected (recommended).
Security best combined technology that activates WPA and
WPA2 and at the same time provides maximum compatibility
with any devices. Enter your access point password and press
the APPLY button.
Client: operation mode on the home router network.
Enter the home router details and the IP address type for the
Client mode:
• Enter the name of the Wi-Fi home router access point.
• Enter the password for the Wi-Fi home router access point.
Select the IP address type:
DHCP: the IP address is set up automatically upon connection to
the home router (recommended).
Static: enables manual entry of the desired IP address, subnet
mask and default gateway. These settings are recommended for
technical specialists only. Select this IP address type at your own
risk.
Then press the APPLY button.

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SPECIAL SETUP MODE
In the event of losing the Wi-Fi password or the unit password, connecting external devices or in other cases, use the special Setup mode
to restore access to the unit functions.
To enter the special Setup mode, press and hold the Setup mode button on the control panel for 5 seconds before the LED on the
button starts flashing.
The location of the Setup mode button is specified in the unit user’s manual. The unit will continue in this mode for 3 minutes and then
automatically revert to the previous settings.
To exit the Setup mode, press and hold the button again for 5 seconds until the LED on the button stops flashing.
Settings for a special Setup mode
Wi-Fi name: Setup mode
Wi-Fi password: 11111111 (the unit password is ignored)
Type of the Ethernet IP address: DHCP
RS-485 address: 1
The transmission rate of the RS-485: 115200 baud
RS-485 stop bits: 2
RS-485 parity: none
Engineering menu password: 1111
CLOUD SERVER CONNECTION
The units can be controlled using the mobile app via a cloud server connection. This function allows controlling the unit that is connected
to the home router, at any remote location via the Internet.
Activating control via cloud server
By default the Control through the cloud server function is disabled.
Activation sequence:
1. Go to Menu ( ) - Connection - At home.
2. Select the desired unit connection.
3. Enter the connection settings menu by pressing .
4. Enable Control through the cloud server.
Note: With this function enabled any loss of Internet connection provided by the home router may result in temporary loss of
communication with the unit.

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Creating an account to control the unit through a cloud server
Open the mobile app and go to MENU ( ) -> CONNECTION -> THROUGH CLOUD SERVER:
1. To add a new account, press the button.
2. Enter a login, a password and an e-mail address for password recovery. Then press .
3. The app will log into the newly created account automatically. Add a new connection .
4. Enter a random name of the unit and an ID number (shown on the control board and on the unit casing) as well as a unit password
(by default: 1111).
5. Confirm the entered data by pressing the button.
6. To exit the account, press .
HOME PAGE
Indicators:
Current type of unit connection. Home connection or connection via a cloud
server through Internet respectively.
Current operation mode of the unit.
Ventilation only (no temperature control, heat recovery only),
ventilation + heating (the unit warms up the outdoor air by means of the
electric heater or with the outdoor air heat), ventilation + cooling (the unit
only cools air by means of the cooler or with the outdoor air cold), auto (the
control system automatically determines if air heating or cooling is necessary)
correspondingly.
Filter replacement indicator.
Red colour – alarm indication, orange colour – warning indication.
Electric heater cooling indicator (preheating or reheating) before switching off the
unit.
Boost Boost mode indication.
Fireplace mode indication.
Sensor readings:
Current temperature of the selected sensor, which controls the air temperature (in the supply air duct, in the
extract air duct and in the room respectively).
Current values for the humidity sensor, СO2, РМ2.5, and VOC correspondingly. The screen displays the setpoint
value for a particular type of sensor connected to the circuit board (hereinafter «main sensor») or if no external
sensor is connected - the information from the one built into the control panel (if present). The indicator colour
provides the following information: gray - no sensor detected; blue - sensor working normally; red - sensor
signal exceeds the pre-set value.

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CONTROL BUTTONS
Unit on/Standby.
Selection of pre-set speed.
Manual speed setup. To activate the scroll bar, check it.
Timer activation. Timer settings are made in the Menu ( ) - Basic Settings - Timers.
Week-scheduled operation mode activation. The settings of this mode are made in the Menu ( ) - Basic
settings - Schedule.
BASIC SETTINGS
Temperature
Go to Menu ( ) - Basic settings - Temperature.
Temperature setpoint
Select the temperature units for display.
Temperature setting for the normal mode (when the timer and weekly schedule mode
are disabled).
Operating mode: select the operating mode to affect the normal mode, timer and the weekly schedule.
• Ventilation: no temperature control, heat recovery only.
• Heating: only air heating with the electric heater or the outdoor air heat.
• Cooling: only air cooling by means of the cooler or with the outdoor air cold.
• Auto: the control system automatically determines if air heating or cooling is necessary.
The temperature control function is not available in units not equipped with a heater, cooler, bypass or rotary heat exchanger.

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Air quality
Go to Menu ( ) - Basic settings - Air quality
This menu contains the humidity, СO2, РМ2.5, and VOC setpoint sliders. If any of these values are exceeded, the PI controller of the unit
will smoothly increase the fan speed. As the sensor signals revert to normal, the unit will smoothly reduce the fan speed to the initial level.
Any non-active sensors displayed as semi-transparent are not accessible.
To enable the sensors, go to Menu ( ) - Engineering Menu - Sensors (see the «Engineering menu» section).
If all the sensors are inactive, the control elements are replaced with the «Air quality management not available» message.
Timers
Timer settings are made in the Menu ( ) - Basic Settings - Timers.
Main timer: Timer mode settings. When the timer is activated in the Home page menu, the unit temporarily goes to the following
settings:
Pre-set speed selection: 1,2,3...,standby.
Timer setting.
Select the desired temperature control level. The temperature control level can be selected in a
+15 °C ...+30 °C range or disabled (off ). If off is selected, the unit does not control air temperature
during timer operation.
Boost turn-o delay: Select the delay time for the Boost mode deactivation after a loss of signal at the discrete input
(Boost switch) on the control circuit board.
Boost turn-on delay: Select the delay time for the Boost mode activation after a supply of signal to the discrete input
(Boost switch).
To enable the discrete input (Boost switch), go to Menu ( ) - Engineering menu - Sensors.

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Schedule
Go to Menu ( ) - Basic settings - Schedule.
To set up a weekly schedule, there are 4 time intervals available for each day of the week. Adjustment can be made separately for every
day, weekdays, weekends or for the whole week. When the Schedule mode is activated from the Home page, the unit will operate as
scheduled according to the following parameters:
Pre-set speed selection: 1,2,3...,standby.
Time setting for a specific time segment.
Control temperature selection. Options available: +15 °C ...+30 °C, off. If OFF is selected, temperature control
will not be performed for a specific period of time.
For proper operation of Schedule, make sure to set the correct date and time.
Date and time
Go to Menu ( ) - Basic settings - Date and time.
Current time and date are displayed and adjusted in this menu.
Time display format: hh:mm:ss.
Date display format: dd.mm.yyyy.

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Filter
Go to Menu ( ) - Basic settings - Filter.
Filter timer setpoint: When the set time (70-365 days) has elapsed, the filter change indicator appears and filter replacement information
is displayed in the Alarms menu. To disable the timer, remove the selection next to the slider of filter timer setpoint. If the unit is
equipped with filter contamination control pressure switches, once the timer is disabled the filter contamination is signalled by the
pressure switches only.
Total operating time of the unit: displays the unit total operating time (non-resettable).
CONNECTION
RS-485 setup
Go to Menu ( ) - Connection - RS-485 setup.
Default settings:
• Controller address: 1.
• RS-485 baud rate: 115200 baud.
• RS-485 stop bits: 2.
• RS-485 parity: none.
Note: you can use the RS-485 bus to connect up to 16 units (slave devices) and up to 16 control panels (master devices). The slave and
master devices have separate IDs. Some control panels only accept the RS-485 default values (see the control panel data sheet). If you
set the RS-485 parameters at the unit to enable external control (e.g. with a smart home controller or a BMS system), some control panels
may malfunction.

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Ethernet setup
Go to Menu ( ) - Connection - Ethernet setup.
Press the Receive button to display the current Ethernet settings.
DHCP: the IP address is set up automatically upon connection to the home router (recommended).
Static: enables manual entry of the desired IP address, subnet mask and default gateway. These settings are recommended for technical
specialists only. Select this IP address type at your own risk.
Then press the APPLY button.
If the control system fails to detect an Ethernet adapter, the «Ethernet adapter not available» message is displayed.
ENGINEERING MENU
Entering engineering menu
Go to Menu ( ) - Engineering menu.
Enter the engineering password. By default the password is 1111.
To change the engineering password, go to Menu ( ) - Engineering menu - Engineering password.
Note: the engineering menu requires expert skills. Inadvertent changes to the engineering menu parameters may cause unit malfunction.

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Air ow
Go to Menu ( ) - Engineering menu - Air ow.
This menu section enables setting the air flow values for the Standby mode, speed 1,2,3 pre-sets
as well as the Boost and Fireplace modes.
If the air flow value selected for the Standby mode is larger than 0 %, the temperature control
function for this mode according to setpoint selected (only +15°С temperature is maintained
provided the unit is equipped with a heater and the Heating or Auto mode is selected in the Basic
settings -> Temperature) as well as the air quality management function will not be available.
If the unit is controlled with an external 0-10 V input or if the PI controller is triggered by a humidity,
CO2, РМ2.5 or VOC level alarm, the balance between the supply and extract air will correspond to
speed 1,2,3 pre-sets.

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Temperature
Go to Menu ( ) - Engineering menu - Temperature
Current temperature
Intake air temperature.
Supply air temperature.
Extract air temperature upstream of the heat exchanger.
Exhaust air temperature downstream of the heat exchanger.
Room temperature (in the controller).
Return heat medium temperature.
Selecting the master sensor for temperature control to be displayed on the home page.
You can select one of the three temperature sensors:
in the supply air duct (default).
in the extract air duct.
in the room (in the control panel).
Note: if the selected indoor sensor is absent, the system will control the temperature using the
sensor in the supply air duct as confirmed by a corresponding message.
Minimum supply air temperature. The minimum temperature of the supply air to prevent
cold outdoor air from entering the serviced space. If the temperature drops below the pre-set
minimum level and does not return to normal within 10 minutes, an alarm is triggered causing the
unit to shut down.
Changeover winter/summer. The setpoint for the winter/summer changeover selectable in the
+5 °C to +15 °C range (+7 °C by default). Uses the feedback from the outdoor temperature sensor.
Affects the water heater and cooler operation. In the winter season the cooler is disabled while the
water heater provides preheating of the circuit before the unit start.
Main heater type. The main heater control mode option becomes available while selecting the
electric heater or the water heater.
Note: if the water heater is active, prior to disabling it make sure that the heat-transfer medium
supply has been disconnected and that the circuit has been drained to avoid damaging the water
heater by disabling it during the winter season. Also prior to enabling either heater make sure that
all the necessary sensors are present to avoid triggering an alarm condition and causing the unit
to shut down.
Main heater control mode. Two options are available: manual control and automatic control. If
manual control is selected, the 0...100 % heater control slider appears. While in the manual mode
the heater is enabled only if the supply fan is active and the supply air duct temperature is below
+45 °С.
Cooler type. Cooler control logic selection. If discrete is selected, the cooler is controlled by means
of a relay. If analogue is selected, the cooler is controlled by means of a 0-10 V signal and a release
relay. Both the discrete and analogue options enable the cooler control mode selection and
setting minimum cooler on/o time.

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Cooler control mode. Two options are available: manual (on) and auto. If discrete is selected, the cooler can be switched on manually
or automatically. If analogue is selected, the 0...100 % cooler control slider appears on selecting the manual mode.
Min. time before OFF. The minimum time for the cooler operation before deactivation.
Min. time before ON. The minimum time for the cooler idling before re-activation.
Cooler hysteresis. Available for coolers with discrete control.
Bypass/rotary heat exchanger control mode. Displays the bypass control mode or the rotary heat exchanger control mode depending
on the unit configuration. The following modes are available for discrete configurations of the bypass/rotary heat exchanger: close/run,
open/stop, auto. The following modes are available for analogue configurations of the bypass/rotary heat exchanger: manual and auto.
If manual mode is enabled, the 0...100 % bypass/rotary heat exchanger control slider appears. The 0 % value corresponds to a completely
closed position of the bypass or maximum speed of the rotary heat exchanger.
Freeze protection. Types of heat exchanger freeze protection.
Freeze protection is activated if the outdoor temperature drops below -3 °С and the supply and extract fans are enabled. Freeze protection
is deactivated when the outdoor temperature raises above -1 °С or if the supply or extract fan is disabled.
Protection by supply fan
The fan speed is smoothly changed to maintain the temperature of +5 °С in the exhaust duct downstream of the heat exchanger.
Protection by bypass
The protection is activated if the bypass is set to automatic and the air temperature in the exhaust duct downstream of the heat
exchanger drops below +5 °С (+3 °С for a two-point bypass). Protection is deactivated if the bypass is opened/closed manually or if the
air temperature in the exhaust air duct downstream of the heat exchanger raises above +7 °С (+6 °С for a two-point bypass). The bypass
maintains the temperature of +5 °С in the exhaust duct downstream of the heat exchanger.
Note: the freeze protection operates only if the main heater is enabled, the bypass is installed on the outdoor side and Heating or Auto
mode is selected.
Protection by electric preheater
If freeze protection is activated, the preheater maintains the temperature of +5 °С in the exhaust duct downstream of the heat exchanger.
Note: deactivate freeze protection at your own risk. This information is also provided in the corresponding on-screen warning.
While selecting protection by preheater make sure that the preheater is connected to the unit to avoid triggering an alarm condition and
causing the unit to shut down.

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Sensors
Go to Menu ( ) - Engineering menu - Sensors.
Main sensor: a wired sensor connected to the control circuit board.
External sensor: a remote sensor that may be contained in the control panel or in a special device
with a parallel connection to the control panel.
Note: also requires activation of the sensor built into the control panel (see the instruction manual
for the specific control panel). If the same sensor is shared by several control panels, activate
the built-in sensor in only one of the control panels or otherwise the panels will show incorrect
feedback from the sensor.
If the corresponding main sensor or built-in control panel sensor is enabled, the unit begins to
respond to its signals. Enabling a missing sensor triggers the corresponding warning in the Alarms
menu.
: setting the measurement range for the СO2or the РМ2.5 sensor.
This setting defines the sensor signal limit value which corresponds to 10 V at the analogue input.
Boost switch. If this input is enabled, the Boost mode is activated on receiving a signal to this
input (on).
Fireplace switch. If this input is enabled, the Fireplace mode is activated on receiving a signal to
this input (on).
Note: the Fireplace mode is not available if the unit is configured to heat exchanger freeze
protection by supply fan or by bypass with the heater disabled.
0-10 V control device. If this input is enabled, the unit stops responding to pre-set speeds 1,2,3..
and will respond to an external pot resistor connected to the control circuit board. To enable this
control option, the unit must be in any mode other than Standby.
Fire alarm sensor. Make sure that the fire alarm sensor is connected before enabling this input. A
loss of signal at this input (off) triggers an alarm condition and causes the unit to shut down.
Water pressure sensor. If this sensor is enabled, the unit control system will monitor the heat-
transfer medium pressure. While the water heater is active, a loss of signal at this input (o) triggers
an alarm condition and causes the unit to shut down.
Water ow sensor.
If this sensor is enabled, the unit control system monitors the heat-transfer flow. While the water
heater is active, a loss of signal at this input (off) triggers an alarm condition and causes the unit to
shut down.
Depending on the unit configuration, the screen shows the supply/extract fan speed in rpm or
the supply/extract fan status (o - fan not spinning, on - fan spinning).
Supply/extract lter contamination control O - filter OK, on - replace the filter.
Main heater/preheater thermostat. If the respective heater is active, a loss of signal at these
inputs (off ) triggers an alarm condition and causes the unit to shut down.
Battery voltage. If the battery voltage drops below 2 V, replace the battery.

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PI controller
Go to Menu ( ) - Engineering menu - PI controller.
This menu contains PI controller settings. The  and Ki factors affect the control signal change
rate in response to external factors. Increasing the factor values causes the control signal change
faster while decreasing the factor values results in slower control signal changes.
U(t): PI controller output, 0-100 %.
Firmware
GO TO Menu ( ) - Engineering menu - Firmware.
This menu displays the current firmware version and date.
To check for the latest firmware update, connect the unit to a router with Internet access. Then press the Check for updates button.
If your unit is running the latest firmware version, the corresponding message is displayed. If a newer version is available, the screen will
show the new firmware version and a complete history of changes, and the Upgrade rmware button becomes active. Once you press
the Upgrade rmware button the firmware upgrade process begins. During the firmware upgrade do not power down the unit, do
not close the mobile application and do not select a new connection. When the firmware upgrade is complete, the screen will show a
confirmation and the connection to the device will be temporarily lost.