9
www.ventilation-system.com
ENGINEERING MENU
Note: the engineering menu requires expert skills.
Inadvertent changes to the engineering menu parameters may cause AHU malfunction.
By default the password is 1111.
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 unit is controlled with an external 0-10 V input or if the PID controller is triggered by a humidity, CO2, PM2.5 or VOC level alarm, the
balance between the supply and extract air will correspond to speed 1,2,3 pre-sets.
Temperature
Selecting the master sensor for temperature control to be displayed on the home page.
One of three temperature sensors can be selected:
• in the supply air duct (by default);
• in the exhaust air duct;
• in the room (in remote control).
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 temperature drops below the set minimum and does not rise above the set minimum within 10 minutes, the unit will stop operating
due to an alarm.
Changeover winter/summer.
The setpoint for the winter/summer changeover selectable in the +5 °C to +15 °C range (+7 °C by default).
Activated outdoor air 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 °C.
Automatic reduction of the air ow rate.
If the main heater cannot heat the temperature in the supply duct to the level of the user-set room temperature, the air flow will be
automatically reduced to reach the set temperature.
Min. valve position – setting of the minimum valve position (0-100 %) of the water heater in winter.
Max. starting time – set time (2-30 min.) after which an alarm will be generated in case of underheating of the return heat medium to
the starting temperature of the AHU in winter.
Max. starting temperature – final value of the return heat medium temperature required for the AHU start in winter at outdoor
temperature <= -30 °C.
Min. starting temperature – initial value of the return heat medium temperature required for the AHU start in winter at outdoor
temperature >= +10 °C
Max. alarm temperature – final value of the return heat medium temperature for the AHU shutdown caused by a freeze alarm in winter
at outdoor temperature <= -30 °C.
Min. alarm temperature – initial value of the return heat medium temperature for the AHU shutdown caused by a freeze alarm in winter
at outdoor temperature >= +10 °C.
Starting temperature setting range: +30 °C...+ 60 °C.
Alarm temperature setting range: +10 °C...+ 30 °C.
Temperature settings for the return heat medium are automatically calculated based on outdoor temperature of -30 °C...+ 10 °C.
Standby temp. = alarm temp. of +5 °C – return heat medium temperature in winter in Standby mode.
In winter, when the AHU is running, this setpoint is designed to prevent the return heat medium temperature from dropping to the alarm
