Setting Date And Time; Supply Air Temperature Control And Compensation; Fan Control - Salda SMARTY XV Manuel De Montage Et D'installation

Closing dampers
Critical alarm
Fire alarm
Heat exchanger frost protection activated
Change filters
Room RH 3 days average is lower than 30%. Limiting speed.
DX cooler defrosting
Fire damper testing

19.5. SETTING DATE AND TIME

For smooth execution of schedules, event log and winter/summer function, it is necessary to set proper date and time in section ADJUSTER › USER SETTINGS
› DATE AND TIME SET and click a button DATE AND TIME SET. It can also be indicated in user environment USER › MENU › SETTINGS › DATE AND TIME. Fast synchronization
with the computer time is possible in user and adjuster environment.

19.6. SUPPLY AIR TEMPERATURE CONTROL AND COMPENSATION

Temperature for supply air or premises temperature may be indicated. In the service environment section SERVICE › MAIN › SUPPLY AIR TEMPERATURE CONTROL you
can control it based on supply or exhaust air temperature. If control by premises temperature is selected, then it is calculated what kind of air is to
be supplied so that the proper room temperature is maintained. It is limited by allowable limits of supply air temperature.
The air handling unit is not designed to heat premises, therefore it is not necessary to use full capacity for low temperature differences – the
compensation in percentage is provided for this purpose. This parameter indicates a percentage of the temperature difference (between the set
temperature and premises temperature) to be compensated for by this function. E.g. set point is 20 °C, temperature in the premises is 16 °C,
compensation is 50 %, difference between the indicated and existing temperatures is 20-16=4 °C. Since 50 % is compensated, then 4*50 %=2
°C. When the received value is added to the set temperature we get the required supply air temperature – 2+20=22 °C. This temperature is not
limited as it is within the supply air temperature protection limits. In this case the system maintains the supply air temperature at 22 °C. The closer
the premises temperature is to the set temperature (20 °C), the faster the supply air temperature reaches 20 °C.
It may be too hot in the premises, therefore this function both heats and cools. Preferred (compensated) temperature is displayed in the window
MONITORING (REQUIRED SUPPLY). If the displayed temperature is 0 °C, it means that temperature maintaining of supply air is switched off.
The temperature of supply air is maintained by the following components (indicated in a sequential order):
Fans (operate slower, if it is too hot);
Recirculation valve (if the ambient air temperature is favourable);
Water cooler;
DX cooler;
Recirculation damper and CO
2
Bypass damper or rotor (in case of favorable outdoor temperature);
Recirculation damper and CO
2
DX heater;
Water heater;
Water cooler/heater;
Electrical heater;
Fans (operate slower, if it is too cold).
Firstly 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.

19.7. FAN CONTROL

The preferred air-flow can be indicated in percentage or in 4 fixed speeds where each of them is dedicated to a relevant system mode:
Building protection;
Economy;
Comfort;
Maximum power.
Fan speed can be controlled by:
Percentage - speed in percentage is indicated in the adjuster environment window ADJUSTER › AIR FLOWS ADJUSTING: 0 % corresponds to 0, and 100 % – 10
V control signal voltage;
Pressure - the maximum system pressure is indicated, which based on speed settings in the adjuster environment ADJUSTER › AIR FLOWS ADJUSTING means
100 % air-flow;
Air-flow (m /h) - K factors of supply and exhaust air and the maximum system air-flow (m
3
adjuster environment ADJUSTER › AIR FLOWS ADJUSTING means 100 %.
Fans based on air-flow and pressure are controlled by PID controller and its coefficients are indicated in the adjuster environment section ADJUSTER
SMARTY XV v2019.06
(in case of favorable outdoor temperature);
(in case of favorable outdoor temperature);
Dampers are closed
Critical failure, system is shut down (for details refer to alarms section)
Fire protection from an external contactor is activated
Heat exchanger frost protection is activated
Warning about clogged filters (pressure switches are activated or filter timer is
activated)
Reduced airflow because of too low exhaust air moisture
Dissolving the DX cooler / heater
Checking fire dampers
/h) are displayed, which based on speed settings in the
3
FR | 19