Carrier 69NT40-541-306 Operation And Service
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T-354 7–65. Open the vacuum pump and electronic vacuum gauge valves, if they are not already open. Start the vacuumpump. Evacuate unit until the electronic vacuum gauge indicates 2000 microns. Close the electronic vacuumgauge and vacuum pump valves. Shut off the vacuum pump. Wait a few minutes to be sure the vacuum holds.6. Break the vacuum with clean dry refrigerant 134a gas. Raise system pressure to approximately 0.2kg/cm(2psig), monitoring it with the compound gauge.7. Remove refrigerant using a refrigerant recovery system.8. Repeat steps e and f one time.Figure 7.5 Compressor Service Connections1. Reclaimer2. Discharge Service Valve3. Compressor4. Suction Service Valve5. Receiver or Water Cooled Condenser6. Liquid Service Valve7. Vacuum Pump8. Electronic Vacuum Gauge9. Manifold Gauge Set10. Refrigerant Cylinder- - - - -1. Remove the copper tubing and change the filter-drier. Evacuate unit to 500 microns. Close the electronicvacuum gauge and vacuum pump valves. Shut off the vacuum pump. Wait five minutes to see if vacuumholds. This procedure checks for residual moisture and/or leaks.2. With a vacuum still in the unit, the refrigerant charge may be drawn into the system from a refrigerant con-tainer on weight scales. Continue to Section 7.7.7.6.4 Procedure - Partial System1. If the refrigerant charge has been removed from the compressor for service, evacuate only the compressorby connecting the evacuation set-up at the compressor service valves. Follow evacuation procedures of thepreceding paragraph except leave compressor service valves frontseated until evacuation is completed.2. If refrigerant charge has been removed from the low side only, evacuate the low side by connecting theevacuation set-up at the compressor service valves and liquid service valve except leave the service valvesfrontseated until evacuation is completed.3. Once evacuation has been completed and the pump has been isolated, fully backseat the service valves toisolate the service connections and then continue with checking and, if required, adding refrigerant in accor-dance with normal procedures.DS123 4 5678910 |
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