Operation; Description; Bypass; Frost Protection - Wolf CWL-2-400 Installation And Operating Instructions Manual

Operation

4 Operation
4.1

Description

The appliance is supplied ready for plugging in and works automatically according to the standard
settings. The discharged dirty indoor air warms up the fresh clean outdoor air. That saves energy while
fresh air is supplied to the desired rooms.
The control system has four ventilation modes. The air flow rate can be adjusted for each ventilation
mode. The constant volume control system ensures that the ventilation balance between the supply and
exhaust fan is realized independent of the duct pressure.
If no external control is connected on to the appliance, then the appropriate ventilation model can be
chosen on the touchscreen display.
For external control a 4-way switch (® Connecting extra multiple switch with filter indication page 37)
can, for example, be chosen, but control is also possible with the Bedienmodul BM-2 (® Connecting
Bedienmodul BM-2 page 39), CO
sensor (® Connecting humidity sensor page 40) or the App.
4.2

Bypass

The 100% bypass makes it possible to supply outside air, which is not heated up by the heat exchanger.
Particularly during summer nights it is desirable to supply cooler outside air. The warm air in the dwelling
is then replaced as much as possible by cooler outside air.
The bypass valve opens and closes automatically when a number of conditions are met (see table below
for bypass conditions).
Follow step numbers 2.1 to 2.6 in the settings menu in the user interface, (® Setting values standard
appliance page 46) in order to adjust the operation of the bypass valve.
Bypass valve preconditions
▪ The outdoor temperature is higher than 10°C (adjustable between 7°C and 15°C at step no. 2.3) and
Bypass
▪ the outdoor temperature is lower than the indoor temperature of the dwelling and
valve open
▪ the temperature from the dwelling is higher than 24°C (adjustable between 15°C and 35°C at step no.
▪ The outdoor temperature is lower than 10°C (adjustable between 7°C and 15°C at step no. 2.3) C or
Bypass
▪ the outdoor temperature is higher than the indoor temperature of the dwelling or
valve closed
▪ the temperature from the dwelling is lower than the set temperature at step no. 2.2 in the settings menu
The appliance features a 'Bypass boost' function. This means that when this function is switched on (can
be switched at step 2.5) the ventilation mode with an opened bypass valve goes to maximum air flow rate
(adjustable at step no. 2.6).
4.3

Frost protection

To prevent freezing of the heat exchanger at low outdoor temperatures, the appliance features a frost
control.
Temperature sensors measure the temperatures in the appliance, when required a preheater is switched
on. If in the event of very low temperatures the preheater has insufficient capacity, stepless unbalance is
created in the appliance.
The software 'recognizes' the appliance.
10 | WOLF GmbH
sensor(s) (® Connecting CO₂ sensor(s) page 41), a humidity
2
2.2)
minus the set temperature at the hysteresis (step no. 2.4).
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