Table of Contents
Advertisement
5. If possible, transport your regulator assembly (preferably dry) in a padded carrying case or equipment
bag separated from sharp items that might damage or scratch the components.
6. You should also protect the second stage from damage from heavy objects.
PRE-DIVE CHECKOUT
Before each use, the CREST regulator must be given a thorough visual inspection and functional test.
NEVER dive with a regulator that shows signs of damage, or provides substandard performance. Please
send the until in for service to CREST or a CREST authorized dealer.
PRE-DIVE INSPECTION CHECKLIST
1. Carefully inspect all hoses and their fittings to ensure they are securely connected into their respective
ports on the first stage.
2. Inspect the length of each hose to ensure that the hoses are not blistered, cut, or otherwise damaged.
If hose protectors are present, slide the protectors back to expose the hose fittings, and inspect the
hoses as described above.
3. Visually inspect both the first and second stage regulators for any signs of external damage.
4. Environmentally sealed first stages only: Closely inspect the external sealing diaphragm for any signs
of damage or deterioration that may cause leakage. Check to ensure that the retainer which holds the
external diaphragm in place is tightly secured.
⚠WARNING: If the external diaphragm shows any signs of damage or neglect, DO NOT attempt to dive
with the regulator until it has received factory prescribed service from an authorized dealer. The
regulator's performance may be compromised, and first stage freeze-up could occur in cold water
conditions.
5. Connect the first stage regulator to a fully charged SCUBA cylinder. (For mounting instructions, read
the REGULATOR ATTACHMENT TO A TANK) SLOWLY open the cylinder valve to pressurize the
regulator. Continue turning the valve counterclockwise until it stops. This is to ensure that the valve is
completely open.
6. Turn the inhalation control knob completely "out" (counterclockwise), and then back "in"
(clockwise) until the regulator provides maximum ease of breathing with no leakage present. Do not
apply excessive pressure.
7. With the Venturi Switch set to PRE-DIVE, purge the regulator momentarily to blow out any dust or
debris which may have entered the second stage. Release the purge button and listen to ensure that
the second stage does not continue to flow any air after the purge button is released.
8. Inhale slowly and deeply from the regulator several times. The regulator must deliver enough air for
you to breathe easily without noticeable resistance.
9. Check to ensure that the submersible pressure gauge is displaying an accurate measurement of the
air pressure inside the cylinder.
10. Check to ensure that the Venturi Switch is set to PRE-DIVE. Gently turn the inhalation control knob
completely "in" (clockwise), only until it clicks. Do not apply excessive pressure. These settings will
help to minimize any loss of your air supply during entry or while making a long surface swim.
Adjustments can be made below the surface.
DURING THE DIVE
When you are ready to submerge, place the second stage in your mouth and set the Venturi Switch to
your desired position.
Turn the inhalation control knob out (counterclockwise) until the regulator breathes comfortably without
leaking or being undesirably sensitive.
As you descend, you may want to turn the inhalation control knob further out to make breathing easier.
This will be particularly true on deep dives where the air density increases.
ANTI FREEZE PROTECTION
Whenever your cylinder is filled, request verification that the water vapor content of the supplied gas is
less than -65F dew point.
Advertisement
Table of Contents
