Regulator; Pressure Reducer - MSA G1 SCBA Operating Manual

4.2

Regulator

(1) Ensure that moisture or debris is not present, especially inside the regulator and in the micro-
phone ports.
WARNING!
DO NOT use any sharp objects to remove dirt or debris from the microphone ports. Rinse with water
to flush ports out. Allow ports to dry fully before placing back into service. Failure to follow this warning
could result in serious personal injury or death.
(2) Ensure the o-ring and seal ring are free of debris and not damaged or missing.
(3) If the SCBA is equipped with a quick connect hose, inspect the rubber seal for deterioration, dirt,
cracks, tears, or tackiness.
a)Inspect the quick connect fittings.
b)Ensure that the openings are clear and free of debris and other contaminants.
c)Ensure that the quick connect fittings operate properly and are secured.
4.3

Pressure Reducer

(1) Threaded Connect: Unthread the handwheel coupling nut from the cylinder valve (if present).
a)Inspect the coupling nut for thread damage.
b)Before installing the threaded handwheel, check that the o-ring inside the handwheel coupling
nut is present and free of damage. If the o-ring is damaged, it must be replaced before the
SCBA is used.
(2) Quick Connect: Turn the quick connect counterclockwise a quarter of a turn and pull away from
cylinder valve to release (if present).
a)Before installing ensure there is no dirt or debris on either the male or female end of the
coupling.
b)Ensure the adapter on the cylinder valve is tight.
(3) Inspect the high pressure relief valve for damage.
a)Ensure the relief valve label is not damaged and that the relief valve ports are not showing.
b)If damaged, remove the SCBA from service and replace the relief valve.
(4) Reattach handwheel to the cylinder valve.
Threaded connect:
Thread the handwheel coupling nut onto the cylinder threads. The handwheel should be hand-tight
(no tools).
Quick connect:
Push the quick connect coupling onto the cylinder valve adapter until an audible snap is heard. The
handgrip will rapidly rotate approx. 45° counter clockwise indicating that the valve is connected to
the pressure regulator.
Grasp the handwheel firmly and pull on it to ensure the handwheel is fully attached.
(5) Ensure that the bell is properly aligned and that the screws are tight. The bell should not be able
to be rotated or loose.
a)If the bell is loose or can rotate, remove the SCBA from service.
G1 SCBA
Visual Inspections
23
US