Multizone; Automatic Bypass; Demand-Driven Regulation Of Ventilation Units Through Co; And Humidity Sensor - Helios EC green Vent KWL EC 700 D Pro / WW Notice De Montage Et D'entretien

Installation and Operating Instructions
EN
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EXAMPLE
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NOTE
Central ventilation units KWL EC.. D Pro/WW

3.2.14 Multizone

"Multizone" / "VAV" = Operate the ventilation unit in the constant pressure mode
The mode can be selected on the controller > Service menu 1: "Ventilation mode" (see also Page 18).
Enter "Multizone" / "VAV"-mode by pressing "Monozone". The current "flow rate (m3/h)" is shown on the display (can-
not be changed), as well as the current set "constant pressure value (Pa)". The desired constant pressure value can be
increased or decreased by pressing the +/-key. The minimum constant pressure value is limited to 20 Pa.
Some ventilation applications require the use of the ventilation unit in constant pressure mode ("Multizone" /"VAV"-mo-
de). The „constant pressure" operating mode is typically selected if the ventilation unit is to ventilate different zones/
units (Multizone) with variable flow rate requirements.
In an apartment building, six residential units are ventilated with a central ventilation unit. Each of the residential units
can vary the flow rate by controlling a valve. In this case, the technical planner will normally calculate a constant pres-
sure for nominal flow rate for the ventilation ductwork. If a valve is then closed, the static pressure in the ventilation
ductwork will change at a constant flow rate and cause a deviation from the calculated and set constant pressure.
The deviation will be detected by the control and the ventilation unit will begin to reduce the flow rate until the desired
constant pressure is reinstated. The resulting flow rate will distribute to the respective residential units corresponding to
the ventilation ductwork planning.
Constant pressure means static pressure in the duct network. In case of changes in pressure in the duct network (e.g.
by opening and closing flaps), the set constant pressure (target value) is achieved by regulating the airflow rate (reduc-
tion or increase of the fan speed).

3.2.15 Automatic bypass

– What is the function of automatic bypass in your ventilation unit?
The main function of automatic bypass is not to channel the fresh outside air through the heat exchanger, but rather
through the so-called "bypass channel" in the unit past the heat exchanger and directly into the supply air rooms.
Terminology:
Bypass closed: Outside air is channelled through heat exchanger into the room = Active heat recovery
Bypass open: Outside air is channelled directly into the room = Inactive heat recovery,
indirect "cooling" of room air.
– When is the unit bypass used?
The bypass is normally used in the summer months for so-called "night cooling". With regard to night cooling. the effect
of cool outside temperatures is used in comparison to room or inside temperatures.
The bypass can also be used in transition periods (spring and autumn) if the room temperature is significantly higher
than the outside air temperature during the day due to high windows ("natural bypass cooling"). The night cooling effect
and "natural bypass cooling" is strongly influenced by the temperature differences between outside air/supply air and
room air, the flow rate, the shade and the required cooling loads. Bypass cooling will never replace air conditioning!
– Bypass functional description
If the ventilation unit is supplied with system voltage, the bypass will close completely. The bypass will open if the all of
the following conditions are met:
Condition 1: The room temperature is higher than the set target supply air temp. (factory setting: 21 °C).
Condition 2: The outside air temperature is higher than the set outside air temperature limit (factory setting: 15 °C).
The temperature of the outside air temperature limit, can be changed on the controller > Service menu:
"Bypass settings" (see also Page 20).
Condition 3: The room temperature is higher than the outside air temperature.
The bypass is closed if one of the aforementioned conditions is no longer met!

3.2.16 Demand-driven regulation of ventilation units through CO

The ventilation unit has the connection option for a sensor (CO
unit motherboard pursuant to the wiring diagram.
The CO control system monitors the CO
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centrations to prevent, for example, signs of fatigue, the lack of concentration or headaches. The CO
tivated
on the service menu of the controller when delivered from the factory.
The humidity controller ensures increased ventilation at higher levels of indoor humidity (% r.F.) for the removal of mois-
ture to counteract damage to the building material. The humidity controller is deactivated when delivered from the fac
tory.
In order to activate the sensor controller, the CO2-sensor or humidity sensor must be activated on the
service menu > "Ext. sensor" (see also Page 20) of the controller after connection to the motherboard.
Furthermore, the ventilation unit must be operated in "Monozone"-mode and "Automatic-mode" (settings on service
menu > "Ventilation mode" (see also Page 18), to set the desired CO2 limit value (factory setting 1000 ppm) or desired
and humidity sensors
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or humidity). The sensor is connected directly to the
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concentration in the room and ensures increased ventilation at higher con-
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sensor is deac-
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