
20 | DE SMARTY XV v2019.06
› PID CONTROLLERS ADJUSTING › FANS SPEED CONTROL BY AIR FLOW OR PRESSURE. Each fan is controlled individually.
In the service environment window SERVICE › FANS › FANS SPEED CONTROL you can limit the minimum and maximum fan control signal voltage. Based on
manufacturersetparameters,theminimum2Vvoltageisindicated,whichmeansthat0Vvoltagesignalissentwhenfansareo,and2Vvoltage
signal is immediately switched on when rotation is required.
Itispossibletospecifythenominalowsofsupplyandexhaustair.Then,themaximalairowiscalculatedautomatically.
19.8. “BOOST“ FUNCTION
Boostventilationfunctionisusedforfastventilationofpremises.Itactivatesthemaximumair-ow(speed4).Boostventilationhasbetemporary,
i.e.itmustbeanalcondition(e.g.CO2limit,time).Thereasonforthislimitation–protectionagainstdryness.Highairowreduceshumidity,and
dry air is harmful for health.
The function is activated by pressing ON and deactivated by pressing OFF button in the BOOST section, or by means of an external contactor
(FANS SPEED SWITCH),whichisconguredintheserviceenvironment(SERVICE › MAIN › FANS SPEED SWITCH) section.
The function is inactive when Stand-by mode is on. Time limit is indicated (ADJUSTER › USER SETTINGS › BOOST TIMER or USER › MENU › SETTINGS › BOOST TIMER). Once the
function is activated, the time is set by the timer and the time is counted till its deactivation. It may be adjusted in real-time, i.e. when the function
is on, in ADJUSTER › VENTILATION CONTROL or in the user environment main window.
19.9. WEEKLY SCHEDULE
A weekly schedule consists of 10 weekly events. They can be added, deleted, activated and deactivated. One event indicates time, mode/BOOST
function, days of the week. Also it is possible to indicate the change of settable mode temperature.
The system changes modes according to the Weekly Schedule only at the indicated times, therefore a user can always change the existing mode
manually.Thisschedulenotiesoftheupcomingmodechangebyindicatingthetimeremainingtillthenextevent.
The schedule is edited in user environment USER › MENU › SCHEDULE.
19.10.HOLIDAY SCHEDULE
This schedule is used when the unit has to operate in uniform mode during holidays. The user interface shows when the schedule period is active
as nobody can change the mode activated by this function (except for protection). In order to control the system in a normal manner, the Holiday
Scheduleperiodmustbedeactivated,i.e.zerovaluesmustbeindicatedordatesmustbechanged.Uptoveholidayperiodscanbeset.
The schedule is edited in the user environment USER › MENU › HOLIDAY.
19.11.WINTER/SUMMER MODE
The winter/summer function is set during the cold periods, because some parts of the system have to be protected against cold outdoor air. During
winteritisrecommendedtoleavetheunitswitchedon,thereforeitispossibletosetblockingofswitch-o.Waterheatersmustalwaysbeswitched
on during the entire winter.
The winter mode may be indicated
Manually;
By date;
Basedon3-daymeanoutdoortemperature,tobecalculatedonlywhenthefreshair(outdoor)pre-heateriso.
19.12.DRYNESS PROTECTION
This function is designed to protect premises against dryness. If the function is active, it calculates the 3-day mean humidity of extract air from the
premises.Ifthemeandropsbelowsetlimit(30%),fansstartoperatinginspeed2incomfortmode.Auserisnotiedoftheactivatedprotection
andlimitedairow.
Ifthehumiditymeanexceedssetlimit(30%)orthefunctionisswitchedomanually,fansstartoperatinginspeed3incomfortmode.
Thefunctionisswitchedon/ointhesectionADJUSTER › USER SETTINGS › DRYNESS PROTECTION or in the window USER › MENU › SETTINGS › OTHER.
19.13.NIGHT COOLING FUNCTION
This function is designed to save energy in the morning, when a fresh night air is used to cool down the building. The function is active only in
summer. If it is switched on but not active yet, activation conditions are checked:
System time from function start to the end (hours/minutes);
Time is exactly every hour from the start;
If STAND-BY mode is set, the unit operates in BUILDING PROTECTION mode for 5 minutes so that the actual temperature data is available. The tempera-
ture is checked after purging. If it is not suitable, the unit returns to STAND-BY mode;
Outdoor temperature is higher than the set outdoor temperature;
Exhaust air temperature is higher than the set temperature;
Exhaust air temperature is higher than the outdoor temperature by at least 2 °C;
Summer.
If all conditions are met the unit starts operating in COMFORT mode (without temperature maintaining). The main window shows that the Night cooling
function is active. When it is active continuously, the deactivation conditions are checked:
Time does not correspond to the start/end interval;
Exhaust air temperature drops below the set temperature;
Outdoor temperature drops below the set temperature;
Mode other than COMFORT was switched or the unit has been shut down.