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Smarty 4X V
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In the service environment section SERVICE › MAIN › SUPPLY AIR TEMPERATURE LIMITS the minimum and maximum supply air temperatures
are indicated as well as permissible time and protection actions (no indication, indication of warning only, or unit shut-down). This function limits the
supply air temperature set by the user and other functions. If it is controlled by premises temperature, this function does not allow supplying warmer
or cooler air than that indicated in the protection.
If the system fails to maintain the right temperature, i.e. the supply air temperature is outside the protection limits for an indicated time period, the unit
is shut down (if indicated) and alarm is displayed. Based on manufacturer set parameters (by default), the minimum permissible supply air temperature
is 16.5 °C, and maximum – 40.0 °C.
1.25.1 Filter Timer Settings
The filter timer limit is set in the service environment window SERVICE › MAIN › AIR FILTERS PROTECTIONS. The maximum setting is 1 year.
1.25.2 Air Filter Protections based on Pressure Relays (only Smarty 4X V 1.1)
Installed pressure switches can protect air filters against clogging. In the service environment window SERVICE › MAIN you can indicate their com
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binations:
› None;
› Supply air;
› Exhaust air;
› Supply and exhaust air.
When pressure switches are activated, the alarm is displayed.
A fire signal can be connected to this controller. Based on manufacturer’s parameters (by default), its input is normally closed (NC). Its configuration
can be changed in the service environment section SERVICE › DIGITAL INPUTS › EXTERNAL CONTROL INPUTS. When the signal is cut, the pro
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tection is activated for an indicated period of time, warning is displayed and indicated mode is performed. Protection is terminated upon canceling the
warning. In the service environment section SERVICE › MAIN › FIRE PROTECTION a period of time when the system does not react and the mode
of activated protection is indicated:
This function activates the preferred system switching on by means of external contactor; it indicates what signal will be sent to input. Possible types
of signals:
› Not used;
› Upon pressing a button the selected system mode is activated. After receipt of the first impulse the function is activated, and after second im
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pulse – deactivated;
› On/off; selected system mode is activated. The mode is active until the contactor is on;
› PIR sensor. When the sensor is activated, the selected system mode is activated. If the signal is not received for 30 minutes, the mode is acti
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vated.
Function is set in the service environment section SERVICE › MAIN › SYSTEM MODE SWITCH.
This function is designed to activate/deactivate the boost ventilation or preferred combination of fan speeds by means of an external contactor. It is
necessary to indicate a type of a signal to be sent to the input and what this function will control. Possible combinations of signal types and functions:
› Not used;
› On/off; selected fan speed combination is activated; the function is active until the contactor is on;
› Upon pressing a button the selected fan speed combination is activated; upon receipt of one impulse the function is activated, and after second
impulse – deactivated;
› On/off. Boost ventilation function is controlled. It is active until the contactor is on. If this function is not shutdown, after expiry of time limit a boost
ventilation is terminated by force.
› Press a button. Boost ventilation function is controlled. After receipt of one impulse it is activated, and after second impulse – deactivated. If this
function is not terminated, after expiry of time limit a boost ventilation is terminated by force.
It is also indicated whether boost ventilation will be activated or a combination of fan speeds is preferred, i.e. it is possible to indicate individually a
preferred speed of the supply and exhausted air fans.
Function is set in the service environment section SERVICE › MAIN › FANS SPEED SWITCH.
› Recirculation damper and CO2 (in case of favorable outdoor temperature);
› DX heater;
› Water heater;
› Water cooler/heater;
› Electrical heater;
› Fans (operate slower, if it is too cold).
First of all the system tries to maintain the supply air temperature by means of a heat exchanger. In case of a plate heat exchanger, the bypass damper
is controlled, and in case of a rotary heat exchanger, the rotor rotating speed or interval is changed. The heat exchanger can both heat and cool – it
depends on outdoor and room air temperatures. It is controlled by a PID controller whose coefficients are indicated in the adjuster environment section
ADJUSTER › PID CONTROLLERS ADJUSTING › HEAT EXCHANGER CONTROL BY SUPPLY AIR TEMPERATURE.
When the heat exchanger operates at full capacity and preferred temperature is not reached, the recirculation damper, then the heater or cooler etc.
is activated (if necessary). Only the components configured for temperature maintaining are activated. It takes 10 s for the system to switch between
the elements.
