Second Stage Evacuation; Third Stage Evacuation - Data Aire DAPA-2.5 Installation, Operation & Maintenance Manual

2. Close the Schrader core shutoff valve and turn OFF the vacuum pump.
3. Disconnect the vacuum pump hoses from the vacuum and attached them to your manifold
gauges.
4. Connect a vacuum hose from the nitrogen bottle regulator to the manifold gauges vacuum
port and carefully break the vacuum with clean dry nitrogen. Slowly raise the pressure to
approximately 5 PSIG (35 kPa) without contaminating the system.
5. Isolate and hold the nitrogen charge for at least 20 minutes.
6. Verify that there are no nitrogen leaks.
7. Carefully release the nitrogen charge. Watching the gauge until it reads 1 PSIG (7 kPa).

Second Stage Evacuation

1. Move the vacuum hoses back to the vacuum pump and restart the pump.
2. Open the Schrader core shutoff valve and evacuate the refrigerant system from both sides
of the system to 1500 micron or less.
3. Close the Schrader core shutoff valve and turn OFF the vacuum pump.
4. Disconnect the vacuum pump hoses from the vacuum and attached them to your manifold
gauges.
5. Connect a vacuum hose from the nitrogen bottle regulator to the manifold gauges vacuum
port and carefully break the vacuum with clean dry nitrogen. Slowly raise the pressure to
approximately 5 PSIG (35 kPa) without contaminating the system.
6. Isolate and hold the nitrogen charge for at least 10 minutes.
7. Verify that there are no nitrogen leaks.
8. Carefully release the nitrogen charge. Watching the gauge until it reads 1 PSIG (7 kPa).

Third Stage Evacuation

1. Move the vacuum hoses back to the vacuum pump and restart the pump.
2. Open the Schrader core shutoff valve and evacuate the refrigerant system from both sides
of the system to 1200 micron or less.
3. Close the Schrader core shutoff valve and turn OFF the vacuum pump.
4. Conduct a rise test by waiting at least 10 minutes to make sure the micron gauge reading
does not go above 1250 microns.
5. Disconnect the vacuum pump hoses from the vacuum and attached them to your manifold
gauges.
6. Connect a vacuum hose from the nitrogen bottle regulator to the manifold gauges vacuum
port and carefully break the vacuum with clean dry nitrogen. Slowly raise the pressure to
approximately 5 PSIG (35 kPa) without contaminating the system.
7. Isolate and hold the nitrogen charge for at least 10 minutes.
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