EN |
37
AMBERAIR COMPACT CX V v2019.04
SYSTEM STATE
DESCRIPTION
Stand-by mode
System operates in Stand-by mode
Building protection mode
System operates in Building protection mode
Economy mode
System operates in Economy mode
Comfort mode
System operates in comfort mode
Emergency run
System operates in emergency mode (for details refer to alarms section)
Preparing
System is preparing for operation (pre-heating of water heaters, etc.)
Opening dampers
Dampers are opened
BOOST function activated
BOOST function is active
Cooling heaters
Electric heaters are cooled down prior to shutdown of fans
Closing dampers
Dampers are closed
Critical alarm
Critical failure, system is shut down (for details refer to alarms section)
Fire alarm
Fire protection from an external contactor is activated
Heat exchanger frost protection activated
Heat exchanger frost protection is activated
Change filters
Warning about clogged filters (pressure switches are activated or filter timer is
activated)
Room RH 3 days average is lower than 30%. Limiting speed. Reduced airflow because of too low exhaust air moisture
DX cooler defrosting
Dissolving the DX cooler / heater
Fire damper testing
Checking fire dampers
6.4.4. 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.
6.4.5. 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
(in case of favorable outdoor temperature);
• Bypass damper or rotor (in case of favorable outdoor temperature);
• Recirculation damper and CO
2
(in case of favorable outdoor temperature);
• 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.
