Preparation and set up, 1 mounting the first stage onto the cylinder valve, 1 yoke connector – Aqua Lung Regulator User Manual

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3. PREPARATION AND SET UP

Aqua Lung America, Inc. recommends that you bring your regulator to your

Authorized Aqua Lung Dealer for the installation of any accessory items, including ins-

trumentation, LP quick disconnect hoses, and alternate air sources.

DANGER

: Whatever the connector, when pressurizing your scuba system, be

sure to open the cylinder valve slowly to minimize the generation of heat. Failure

to do so, with enriched air nitrox (EAN) present, increases the risk of combus-

tion that can lead to serious injury or death.

WARNING

: It is considered a safe practice, especially when using EAN, to open

the cylinder valve slowly and let the first stage pressurize slowly. Rapid pressuri-

zation causes adiabatic compression of the breathing gas, which generates heat

inside the first stage. Heat, along with elevated percentages of oxygen and an

ignition source (from contamination) are the ingredients that can cause com-

bustion. This is why it is necessary to keep the interior of the regulator clean

and the fraction of oxygen below 40% along with the slow opening of the valve.

3.1 Mounting the First Stage Onto the Cylinder Valve

3.1.1 Yoke Connector

Partially loosen the yoke screw of the first stage regula-

tor so that the dust cap can be removed from the filter

and air inlet.

With the cylinder valve facing away from you, release a small amount of air from

the cylinder by turning the handwheel counter-clockwise to open the valve only

slightly. When air is heard exiting, immediately close the valve. This will clear any

moisture or debris that may be inside the cylinder valve outlet opening.

Check the condition of the cylinder valve O-ring

Place the first stage regulator over the cylinder valve so

that the inlet fitting aligns with the O-ring of the cylinder

valve, and the LP hose of the primary second-stage will

be routed over the right shoulder. While holding the first

stage in place, turn the yoke screw clockwise. Ensure

that the yoke screw mates into the small dimple on the

backside of the cylinder valve, and tighten finger-tight

only.