Owner`s manual

O ptima FX Owner’s Manual

Ch. 6 Pg. 7

Automatic Diluent addition Valve

The ADV comes fully assembled from the factory and is installed by

the diver onto the inhalation counter-lung. The screw on fitting is

RED signifying the inhalation side of the loop. Examine the TWO o-

rings on the counter-lung fitting for debris and proper lubrication. The

ADV mounts to the inhalation counter-lung by pressing the ADV

onto the counter-lung connector as far as possible and turning the ring

on the ADV counter-clockwise several times, and repeating the

process until the ADV is fully seated. The ring that secures the

counter-lung fittings should be held while tightening the ADV

ring. Failure to hold this ring may loosen the counter-lung connector

instead of tightening the ADV ring since the rings tighten in

OPPOSITE directions. Loosening the counter-lung connection will

cause leaks until the connector is correctly tightened.

IMPORTANT NOTE

The inhalation and exhalation counter-lung fittings are both secured to the internal breathing

bags using a normal right handed thread (clockwise tightens the fitting). This is important

because tightening the ADV may loosen the inhalation counter-lung fitting while loosening the

T-Piece may loosen the exhalation counter-lung fitting.

DO NOT try and tighten the ring by more than a few turns each time, otherwise it may be

impossible to fully seat the ADV. The swivel fitting should be positioned so that it points away

from the diver. This positioning allows the diver the easy access to the cut-off valve.

The diluent gas can now be connected to the ADV. The LP hose with the gas cut-off can now be

attached to the ADV LP swivel. This connection should only be hand tight. Do not use any tools

to tighten.

ADV Component Breakdown

ADV Bottom View