EN |
11
RIRS 400-700 V EKO 3.0 v2019.06
19. AUTOMATIC CONTROL
Supply air temperature can be adjusted according to the temperature measured by the supply or extracted air temperature sensor and the tem-
perature which is set by the user on the remote control panel. User selected supply air temperature is maintained by the plate (or rotor) heat
exchanger and additional electric and/or water heater (optional). When the supply air temperature is under the set temperature, by-pass valve is
closed (fresh ambient air passes through the plate heat exchanger). If the device has the rotor heat exchanger, then rotation starts. In case the
set temperature is not reached, the heater (electric or water) is switched on and operates (heater valve is opened/closed if water heater is used)
until the set temperature is reached. When supply air temperature exceeds the set temperature, the heater is switched off in the first place. If the
temperature is still greater than the set temperature, the by-pass valve is opened or rotation is stopped if the device has rotor heat exchanger.
In the remote controller, temperatures (the set and the measured) are displayed as degrees Celsius (°C).
Room air temperature can be adjusted not only according to the supplied air temperature sensor, but also according to the extracted air sensor
(see FLEX panel description II.6.5.3 for details on selecting this feature).
When control algorithm of the extracted air sensor is selected, then supply air temperature is adjusted based on estimated additional received
heat (heat emitted by the sun, electric heaters, etc.). Thus the energy for excessive heating of the supply air is saved. The room is heated based
on the estimated room temperature to provide the desired room temperature microclimate.
Supply air electric heater (resistance heating elements if the electric heater is used) is controlled by the ESKM controller using the PWM signal. If
the water supply air heater is used, then the actuator is controlled using RG1 controller with analogous 0-10V DC signal.
“BOOST” feature
Fans are started at maximum speed and “BOOST” is displayed in the remote control panel (FLEX). “BOOST” feature is inactive if the heat ex-
changer protection is triggered. When triggering signal for this function disappears, the desired operation period for this feature can be selected in
the control panel (FLEX) (see FLEX panel description II.6.6 for details on selecting this feature).
There is boost time setting in minutes (factory setting: Off) in the user menu item Add.Func. For example, if 5min is set, then in case the signal
is lost for boost controlled with the external control signal, the boost will be active for 5 minutes. For boost controlled with the fast button (FLEX
control panel), boost is activated for 5 minutes if the button is pressed once, and boost will deactivated immediately if the button is pressed second
time. Maximum setting is 255min.
START/STOP feature
The operation of the recuperator is started or stoped using the START/STOP feature. “STOP” is displayed at the remote control panel (FLEX). In
START mode, the recuperator operates based on the latest settings of the panel.
FanFail and FanRun features
It provides option to connect the external fan state indication such as the indication lamp which would visualize the state of the device.
Continuous control of the heater
The new feature is installed: continuous keeping of the supply air temperature (accuracy up to 0,5 °C) by using two-way thyristor module – ESKM...
(these modules are installed only in heaters connected to the three-phase mains).
Cooling by ventilation:
Two types of cooling exist: using halocarbon or water cooler. Cooling is based on the algorithm of the PI regulator and is activated when there
is need for cooling. Conditions for activation and deactivation of halocarbon cooler can be set and changed using the menu of the FLEX remote
control panel (see section II.6.4. of the FLEX description). Actuator position of the water cooler is set accordingly to the PI regulator in the range
between 0% and 100%. The halocarbon cooler is switched on when PI regulator value exceeds the value set in the menu (see section II.6.4.2. of
the FLEX description). The halocarbon cooler is switched off when PI regulator value is less than the set value (see section II.6.4.3. of the FLEX
description).
Ventilation:
Three types of ventilation are possible (see section II.6.3. of the FLEX description): based on the supply air (Supply), based on the extracted air
(Room) and automatic (ByOutdoor). When operation is based on the supply air, the supply air temperature is maintained as set on the PI regulator.
When operation is based on the extracted air, the set extracted air temperature is maintained to keep the supplied air temperature between the
minimum and the maximum set temperatures (see sections II.6.3.2. and II.6.3.3. of the FLEX description) based on the algorithm of the PI regu-
lator. When operation is automatic (ByOutdoor), both mentioned cooling types are used (supply and extracted air): cooling based on the supply
air is used when ambient air temperature is less than the set temperature (see section II.6.3.3. of the FLEX description). This is so called “winter
mode”. Cooling based on the extracted air is used when ambient air temperature is greater than the set temperature (see section II.6.3.3. of the
FLEX description). This is so called “summer mode”.
Using the remote control panel, the user can adjust fan motor speed as three steps (values of steps are speed set in the window of the remote
control panel, see sections II.6.7 and II.6.8 of the FLEX description). Analogous 0–10 VDC control signal for motors is generated by the controller
RG1. Speed of the supply and extracted air fans can be adjusted synchronously or asynchronously (see sections II.6.7 and II.6.8 of the FLEX
description). If water supply air heater is used and after HVAC unit is switched on, fans are switched on after 20 seconds. During this period, water
valve actuator is being opened to allow water heater to reach the optimum temperature.
Two pressure converters should be used to control both fans while maintaining constant pressure at the system.
