3-9. EMERGENCY BREATHING APPARATUS (EBA) MAINTENANCE INSTRUCTIONS. (CONT)
Connect EBA breathing tube (10) to EBA regulator outlet (11).
It is not necessary to remove the warning light electrical wire or the face piece vent tube from the
Disconnect face piece (12) from breathing tube (10) and lay face piece (12) to the side.
The breathing tube should be kept as straight as possible to ensure the most accurate gauge readings.
Connect breathing tube (10) directly to inlet connection (6).
High pressure air hazard. Always attach the regulator to its appropriate air supply source. Never attach a
low pressure air line regulator to a high pressure air supply without an in line regulator to step the pressure
down. Failure to follow this warning could result in severe personnel injury or death due to over-
pressurization and explosion.
The air line supply pressure to the EBA should be 85-90 PSIG.
Attach remote air supply line (13) to tether line connection (14).
Ensure flow valve (4) is closed by turning it clockwise.
Ensure regulator valve (15) is closed.
Turn on the remote air supply.
Completely open regulator valve (15).
The static pressure is read from the pressure gauge when the flow valve is closed.
Read pressure gauge (2).
Open briefly and close flow valve (4) a number of times until a repeatable static pressure is read from
pressure gauge (2). The static pressure should be between +1.1 and + 1.5 inches of water when flow valve
(4) is closed.
If the static pressure is not between +1.1 and +1.5 inches of water or if a constant reading cannot be
achieved, depressurize the system and perform the following checks:
Remove the regulator cover and check that the diaphragm spring is properly seated in the center of the
diaphragm cup. Refer to paragraph 3-9.2.7.
Check the diaphragm spring for distortion. Replace damaged spring.