User manual

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WARNING! The full-face mask's O-ring must not be used when the breathing valve is used together with a
mouthpiece. Otherwise, there is a risk that the mouthpiece will come loose.
12.4.5 FULL-FACE MASK
Replacing a strap device
Begin with the strap device's upper strap. Thread the strap through the buckle from the inside of the full-
face mask. The IS logo in the middle of the strap device must be visible after installation. Thread the main
strap through the lower part of the buckle under the roller and then back over the roller and through the
upper part of the buckle. Repeat the procedure for the other straps.
Replacing a valve disc
The valve disc is located in the inner mask.
1
. Grip the valve disc with your ngers and pull it upwards. Discard the old valve disc.
2. Insert a new valve disc by rst threading the hole
of the valve disc over the short side of the valve
seat pin. Carefully stretch the valve disc so that
the hole can be threaded over the entire pin.
3
. Check that the valve disc is positioned on the pin
in an unimpeded manner.
4
. Check that the rubber in the inner mask is not
deformed and that it is tightly positioned around the valve seat.
Replacing a xing lock
Check that the O-ring is in place (replace the O-ring if necessary) in the xing cover and that the locks are
correctly positioned around the screws.
Attach the xing cover. The round part must be facing the visor. Tighten the two screws.
Comment: Carefully tighten the screws by hand.
Replacing a pressure equalization cushion
The pressure equalizer is held in place by a wire holder.
1
. Check that the wire holder is not deformed.
2. The pressure equalizer has three grooves for connecting the wire holder. When replacing the pressure
equalizer, the wire holder must be returned to the same groove. Check that the wire holder is in place in
the groove so that the pressure equalizer will not come loose or move.