MSA G1 SCBA Operating Manual page 34

WARNING!
During system pressurization, listen for the sound of hissing or popping. If you hear hissing or popping,
remove the SCBA from service, and return it to an MSA trained and certified repair technician.
Failure to obey this warning can result in serious personal injury or death.
(11) Grasp the regulator and push the side buttons to release
the regulator from the regulator retainer.
(12) Turn the regulator bypass knob clockwise to close the
regulator bypass valve fully.
(13) Reach behind and turn the handwheel counterclockwise
to open the cylinder valve fully.
(14) As the system pressure increases from
0 to 200 psi, both visible and audible alerts
activate automatically, indicating that the
SCBA is operating correctly. Make sure
the following indications occur:
Brief sound from the pressure reducer

primary low-pressure warning device
Chirp from the power module and speaker

module (if available)
Pressure display on the HUD

Buddy light flashes green on the power and

control modules
G1 SCBA 2018 Edition
Donning
US
34