User manual

Poseidon MKVI User Manual
Chapter 1
Page 28
12. Front CC hoses to mouthpiece
Make sure that the in- and exhalation check valves are installed in the mouthpiece, in their
correct position.
Make sure the check valves are undamaged, that they aren’t folded in any way and that they
are clean.
Make sure you have the mouthipece in the correct position. Connect the front left CC loop
hose to the inhalation side CC loop hose connection of the mouthpiece.
Connect the front right CC loop hose to the exhalation side CC loop hose connection of the
mouthpiece.
The nal step in assembling the breathing loop is the convertible open-circuit / closed-circuit
mouthpiece. Figure 1-45 shows the bottom half of the mouthpiece and the two closed-circuit
(CC) hose connections. Each CC connection contains within it a removable ow checkvalve
and o-ring sealed carrier plate. These checkvalves constrain the direction of the breathing gas
from left to right. The left CC entry port into the mouthpiece is the “upstream” or “inhalation”
port, and the right CC entry port is the “downstream” or “exhalation” port. Figure 1-45 shows
a close-up view of the downstream CC checkvalve. It should be free of debris and should lie
smooth and uniformly at against its removable carrier plate. If there is any curling, cuts,
gouges or other damage to the checkvalve, remove the carrier plate and replace the check-
valve only with a Poseidon original manufacture mouthpiece checkvalve. Attach the right hand
front breathing hose to the downstream CC port as shown in Figure 1-45, following the proce-
dures previously described.
Exhalation (right) CC port
Inhalation (left)
CC port
Exhalation close circurit checkvalve
Inhalation close
circurit checkvalve
Figure 1-45. Inspect the inhalation CC and
exhalation CC checkvalve on the mouthpiece.
Attach the front breathing hoses to the inhalation
and exhalation CC ports on the mouthpiece.
Tighten the hose nut on the downstream CC port
threads. DO NOT use tools or over-tighten.
Figure 1-44. Breathing hoses properly connected to the mouthpiece.