MAXA MI 2.6 Série Manuel Utilisateur Et Installation page 22

2. There are two grooves in each frame grille: pull up and take off the air filter.
3. Find the purging valve as the picture: unscrew the valve by hand or by long nose pliers.
Transparent pipe
4. Open the water inlet valve to run the water flow into the coil, and check the water in the transparent pipe connected to
the valve. Should the transparent pipe, once filled with water, be without bubbles, that means air has been completely
purged from the coil. Then, close the purging valve.
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