Evacuation

EVACUATING A/C SYSTEM
1. Discharge the refrigerant system into an approved recovery unit.
2. Be certain the manifold gauge set is connected as follows:
a. Low pressure hose connected to the low pressure service gauge port on the top center of the accumulator/drier assembly.

Service Hose Adapter Tools:

b. High pressure hose to the high pressure service gauge port on the compressor discharge line at the condenser connection. An adapter is necessary at this service gauge port.
c. Connect the manifold gauge set center hose to a vacuum pump.
3. Open the manifold gauge set valves and start the vacuum pump.
4. Evacuate the system with the vacuum pump until the low pressure gauge reads at least 25 inches of Mercury (vacuum) and as close to 30 inches as possible. Continue the vacuum pump operation for 15 minutes. If a part of the system has been replaced, continue the vacuum pump operation for an additional 20 to 30 minutes.
5. When evacuation of system is complete, close manifold gauge set valves and turn vacuum pump off.
6. Observe the low side gauge to be sure the system holds vacuum for 5 minutes. If vacuum is held for 5 minutes, proceed to charging the system. If vacuum is not held for 5 minutes, leak test the system, service leak(s) and again evacuate the system.