User manual

14
3.5.4 REDUNDANT BREATHING SYSTEM
• The regulator unit comprises two pressure regulators. The primary regulator provides the primary breathing
valve or the full-face mask valve with intermediate pressure air, and the secondary regulator provides the
octopus breathing valve with intermediate pressure air.
The primary regulator receives air via the reserve valve handle, while the secondary regulator is always directly
supplied with air from the air cylinders. Thus the system has a backup system. The diver can always obtain
respiratory air in three different ways:
· If the surface air supply from the DP1 Supply Hose System is interrupted - Pull out the reserve valve handle
to switch to air supply from the cylinder pack.
· If only a limited cylinder capacity (volume) remains - Pull out the reserve valve handle to switch to the
reserve air volume.
· If the primary breathing valve or the full-mask valve does not work – Press in the reserve valve handle to
the closed position and use the octopus breathing valve. Alternatively, if possible, pull the CDR handle,
take a breath and close the CDR handle. Repeat this while ascending to the surface. If this does not work,
go over to the octopus breathing valve permanently!
Surface air supply does not work
If the air supply from the DP1 Supply Hose System is interrupted, the diver will receive an insufcient amount
of air or no air at all. In emergency situations, the diver should simply pull the reserve valve handle to activate
the air supply from the cylinder pack.
Air supply warning
If cylinder pressure drops to approximately 65 bar (943 psi), the air supply warning will be activated. This
will result in a reduction in air ow from the primary breathing valve or full-face mask valve, which the diver
will perceive as a respiratory resistance.
In this case, the diver must pull out the reserve valve handle to the reserve position (R) in order to utilize the
remaining reserve air volume of the cylinder pack.
Malfunction in primary breathing valves
If the primary breathing valve does not work (e.g. as a result of freezing) resulting in insufcient air or no
air, the diver should depress the reserve air handle (to close the air-ow) and change to the octopus breathing
valve. Always check the pressure on the pressure gauge after changing the air supply. Start your ascent to the
surface.
Fault case A
No air
(incl. respiratory resistance as a
consequence of a warning)
Fault case B
Free airflow
(incl. all free flow faults in
the primary regulator)
Action A
Pull handle for air
Pull reserve valve handle (this
changes automatically to position R
if the cylinder pressure is lower than
100 bar (1450 psi) or D if the cylinder
pressure exceeds 100 bar/1450 psi)
Action B
Press handle for
cut-off airflow
Press reserve valve handle for position C
(cuts off the free airflow). Change to
reserve regulator use (octopus), or open
and close the reserve valve handle at
each breath.
Normal diving (primary regulator use)
Autonomous diving -> Reserve valve handle in position D
Hose diving with DP1 -> Reserve valve handle in position C