Functions; Bypass Function; Heat Recovery Defrosting; Maintenance Display - Helios KWL EC 200 Eco R Installation And Operating Instructions Manual

2. Function
The differential pressure switch DDS monitors the pre-installed outside air filter G4 and the
optional usable pollen filter F7 (intake air). It monitors the static pressure loss between out­
side air and intake air duct.
If the air flow volume is reduced due to dirty filters, the pressure loss decreases between the
two measuring points ( In the extreme case at V=0 Þ
A filter signal, for example a signal lamp can be build on site.
3. Adjustment
The following conditions must be fulfilled:
1. The system is installed and air flow volume V is set. .
2. Switch position of DDS on 3/1 (see wiring diagram SS-857.1, page 10).
3. Set KWL EC 200 Eco unit on middle speed step.
Turn adjustment knob at the DDS (+/-) until switching point responds. Now read the switching
point and reduce by approx. 15% (e.g. 100 Pa Þ setpoint 85 Pa). As soon as the pressure
drops below 85 Pa, the filter signal (build on site) control responds.

Bypass function

Adjustment is carried out via mechanical bypass flap. Open or closed manually. The outside
air is passed by the counter flow heat exchanger at 100% and thus the heat recovery is
stopped.
Defrost function of heat recovery cell
To protect the heat recovery cells from freezing, the supply air fan was switch off temporary
by the measured data of the frost protection sensor.

Maintenance display

Adjustment and control is effected via differential pressure switch DDS (see wiring SS-857.1).
The differential pressure switch DDS is a complete kit to monitor air filter, system pressure
and fan operation. The filter state is indicated over a signal lamp (build on site). In that case
the filters must be cleaned or exchanged.

Part list KWL EC 200 Eco

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p=P1-P2=0 ).
D
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8

FUNCTIONS

manual bypass function