6
Air 70 Rev. D
The Air 70 is also available as "Plus" version. This version
features a second control pcb with additional connectors (X8
- X19) with more connection options for several applications.
See § 9.2 for more information about the connection options of
the Plus pcb connectors X8 - X15.
The “Plus” print connector is "clicked" directly on the control
pcb.
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wards in a simple manner to a Plus version
Just like the Control pcb connectors, the Plus connectors are
accessible after the front cover has been removed (see §8.1
item 2); then the cover that protects the electronics can be un-
screwed (see §5.4 item 6).
One breakout tab is available at the rear for connecting the plus
pcb with components outside the appliance.
The Plus pcb must always be "signed on" to the Con-
trol pcb, DIP switch 1 must be ON (see §10.1)
Chapter 4 Operation
4.3 Frost safety
To prevent freezing of the heat exchanger at extremely low
outdoor temperatures, the Air 70 features intelligent frost con-
trol. The built-in preheater is activated when the outdoor tem-
perature drops below -1.5°C. That guarantees proper balanced
ventilation at all times.
Only when the outdoor temperature drops so low that the pre-
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duced to protect the exchanger from freezing over.
4.4 Air 70 Plus version.
4.1 Description
The appliance comes plug and play and operates fully auto-
matically. The exhaust air from indoors heats up the fresh,
clean outdoor air. That saves energy while fresh air is supplied
to the dwelling.
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4.2 Bypass conditions
The appliance features a bypass function. The bypass is in-
tended to lead the cooler outdoor air around the exchanger
during the night after a hot summer's day. That way the cooler
outdoor air directly enters the dwelling. The bypass motor ac-
tivates the bypass slide when the bypass conditions are satis-
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the heat exchanger, so that under these conditions -undesired-
heat recovery does not occur.
Bypass conditions
Bypass open
- The outdoor temperature is higher than 16°C
and
- the outdoor temperature is lower than the indoor temperature in the dwelling
and
- the temperature in the dwelling is higher than the bypass temperature (standard setting 22°C)
Bypass closed
- The outdoor temperature is lower than 160°C
or
- the outdoor temperature is higher than de indoor temperature in the dwelling
or
- the temperature from the dwelling is lower than the bypass temperature minus the set hysteresis
temperature; the factory setting for this temperature is 20°C (22.0°C minus 2.0°C).