Emergency Contact; Operating Mode; Operation Of The Ventilation Unit In The Constant Pressure Mode - Vav; Automatic Bypass - Helios KWL EC 800 S Pro Montage- Und Betriebsvorschrift

Installation and Operating Instructions
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EXAMPLE
Central Ventilation Units KWL EC.. S Pro/WW

3.2.9 Emergency contact

The function when the emergency contact is open can be set in service menu 13 emergency air flow.
The operating mode when the fire contact (circuit board A1, terminal 15-16) is open can be selected in the drop-down
menu:
-No flow
-Flow supply air + extract air
-Flow only supply air
-Flow only extract air
The respective air output (flow) when the emergency contact is open can be set with the "Flow" slider.

3.2.10 Operating mode

One of the operating modes listed below can be selected in service menu 01 Mode:
DCV: The unit ventilates according to the connected air quality sensor, e.g. humidity, CO2 sensor or external 0-10V
signal.
CAV: Constant flow rate mode. The unit ventilates with a constant flow rate and variable pressure. The flow rate setting
can be adjusted on the start screen by clicking on the fan symbol.
VAV: Constant pressure mode. The unit ventilates with a constant pressure and variable flow rate. The pressure value
can be adjusted in service menu 04 Fan calibration.
3.2.11 Operation of the ventilation unit in the constant pressure mode – VAV
In an apartment building, six residential units are ventilated with a central ventilation unit. Each of the six residential units
can vary the flow rate by controlling a valve. In this case, the technical planner will normally calculate a constant pressu-
re 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).

3.2.12 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 = heat recovery active
Bypass open: Outside air is channelled directly into the room = heat recovery inactive,
indirect "cooling" of room air.
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