Hi,
the vallox unit uses a recuperator. This heats up cold air in winter and can be bypassed.
You can set the incoming air temperature on the web interface.
The recuperator itself is neither on (“WRG”) or off (“Bypass”).
Examples:
(1) incoming temperature is set to 18°.
(1.1) Winter: outside 6°, inside 20°. because outside is lower than setting 18, recuperator is on, incoming air will be heated. Good.
(1.2) Summer daytime: outside 30°. because outside is higher than setting 18, recuperator is off. Good.
(1.3) Summer nighttime. outside 15°, inside 25°. because outside is lower than setting 18, recuperator is off. Not good. This heats incoming air, not giving the possibility to cool down.
(1) incoming temperature is set to 5°.
(1.1) Winter: outside 6°, inside 20°. because outside is this time higher than setting 5, recuperator is off, incoming air will not be heated. Not Good.
(1.2) Summer daytime: outside 5°. because outside is higher than setting 18, recuperator is off. Good.
(1.3) Summer nighttime. outside 15°, inside 25°. because outside is higher than setting 5, recuperator is on. Good.
As you can see, the setting of the bypass temperature needs to be changed depending on inside and outside temperatures for a perfect automation.