What do the three buttons of this fresh air system mean? I know the first one is the switch, the second one is the air volume, and the third one is the internal and external circulation. Above is the

What do the three buttons of this fresh air system mean? I know the first one is the switch, the second one is the air volume, and the third one is the internal and external circulation. Above is the interior. The third switch, if you look at the logo alone, neither symbol is an inner loop.

Only one bypassed the heat exchange core (it is estimated that the exhaust gas bypassed the heat exchange core). Usually, if this function is available, the exhaust may be bypassed. In the cool season of spring and autumn, the heat in the exhaust air is not recovered, which makes full use of the cool outdoor air to cool down indoors. Prevent indoor sultry in transition season.

The symbol below the third key position is the symbol of normal heat exchange operation mode.

If there is no answer in the manual, it is suggested to directly choose the following mode, which is the normal working mode of the fresh air processor and the real purpose of using the fresh air host.

At present, quite a few products of fresh air system host use LCD panel, and few use this button panel.

According to my opinion:

The three keys from left to right are:

1, on/off, 2, strong/weak wind. 3. Bypass (no heat exchange)/heat exchange.