13. Slowly turn on the cylinder by turning the on/ off knob counterclockwise. You will hear air pressurizing the hoses of the regulator. If you hear a loud hissing sound from the cylinder valve, you may have a problem with the seal between the cylinder valve and the first stage. This indicates that the valve O-ring needs to be replaced. Air leaks elsewhere indicate other problems that must be corrected before diving. Chapter 3- Diving Skills 14. Open the cylinder valve completely by turning the on/off knob counterclockwise until it stops. Then turn the knob back about one-quarter turn. This completes the assembly of your scuba unit. However, before you can use the unit, you must test it to be sure it is operating properly. Testing Your Scuba Unit Testing your scuba unit includes making sure that your primary and back-up second stages work and that your BC is inflating and deflating properly. The steps to test your scuba unit are: 1. Look at your SPG to see how much air you have in your cylinder (figure 3-23). If you are using a 200 bar (3000 psi) cylinder, your SPG should reflect about 200 bar (3000 psi). If your gauge reads less than about 165 bar (2500 psi), you should switch your equipment to another cylinder if you are planning a normal full-length dive. 2. Put your primary regulator in your mouth, breathe out, and then breathe in to be sure that Diving Skills 57 FIGURE 3-21. THE YOKE SCREW SHOULD ONLY BE TIGHTENED UNTIL IT IS SNUG. DO NOT USE ANY FORCE. FIGURE 3-23. CHECK THE SUBMERSIBLE PRESSURE GAUGE TO BE SURE THE CYLINDER IS FULL. FIGURE 3-22. BE SURE TO CONNECT THE LOW-PRESSURE INFLATOR HOSE TO THE POWER-INFLATOR HOSE ON YOUR BC.
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