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3.4.5. CDA panel
The panel below sets and controls the pressure of clean/dry air (CDA). It splits into two air
set regulators, one for the Venturi Pump air supply and one for the Line Leak Test.
Solenoid valve S9 usually is opened to supply air to drive the two Venturi Pumps. It shuts
off automatically when the Backup Exhaust Pump takes over and is manually reset to
open. The venturi regulator is set to 75-80 psig. If the Venturi option is used, the line leak
regulator is set to approximately 15 psig when the test is active. The needle valve provides
a flow restriction so that each line decreases approximately to 0 psig and increases for
each tested line as it holds the pressure, as indicated on the gauge. S10 is closed except
during the test mode when it remains open.
Figure 20. CDA Panel
1. Line Leak to Sample Rail
2. Line Leak Gauge
3. Line Leak Needle Valve
4. CDA In
5. To Venturi Pumps
6. Line Leak and Venturi Regulators/Gauges
7. Isolation Valve S9 / Solenoid Valve S10 / Solenoid Valve
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