Pressure Reducer With Primary Low-Pressure Warning Device - MSA G1 SCBA Operating Manual

(1) Make sure there is no water, dampness, moisture, or debris on the inside of the regulator and
microphone ports.
(2) Make sure there is an O-ring and a seal ring, and that they are not damaged or dirty.
(3) If the SCBA is equipped with a quick-connect hose, make sure there is no deterioration, dirt,
cracks, tears, or tackiness on the rubber seal.
a) Make sure there is no dirt or debris in the openings of the quick-connect fittings.
b) Make sure the quick-connect fittings operate correctly and are secure.
4.4

Pressure Reducer with Primary Low-Pressure Warning Device

WARNING!
Make sure to protect the quick-connect fitting and adapter from damage, dirt, and debris during
cylinder replacement. Dirt and debris can cause the cylinder connection seals to leak. Failure to obey
this warning can result in serious personal injury or death.
(1) Disconnect the handwheel from the cylinder valve assembly.
• Threaded connect
a) Remove the handwheel coupling nut from the cylinder valve assembly.
b) Make sure the threads of the handwheel coupling nut are not damaged. If necessary, replace
the nut.
c) Make sure there is an O-ring on the stem of the handwheel assembly and that it is not
damaged. If necessary, replace the O-ring.
• Quick-connect
a) Turn the quick-connect fitting counterclockwise until it stops, and pull it away from the cylinder
valve assembly to release it.
b) Make sure there is no dirt or debris on the male and female fittings of the coupling.
c) Make sure the adapter on the cylinder valve assembly is connected securely.
(2) Make sure the high-pressure relief valve is not damaged. If necessary, remove the SCBA from
service and replace the high-pressure relief valve.
a) Make sure the relief valve label is not damaged.
b) Make sure the relief valve ports are not visible.
(3) Attach the handwheel assembly to the cylinder valve assembly.
• Threaded connect
a) Install the handwheel coupling nut on the cylinder valve assembly.
b) Make sure the handwheel is hand-tight (tools are not necessary).
• Quick-connect
a) Push the quick-connect fitting onto the cylinder valve adapter until there is an audible snap.
The handgrip will turn rapidly approximately 45 degrees counterclockwise, indicating that the
valve is connected to the pressure regulator.
b) Grasp the handwheel firmly and pull on it to make sure it is attached securely.
(4) Make sure the bell is aligned correctly and that the screws are tight. Make sure the bell is not
loose or able to turn. If the bell is loose or can turn, remove the SCBA from service.
G1 SCBA 2018 Edition
Visual Inspections
23
US