SYSTEM EVACUATION
Condensing unit liquid and suction valves are closed to contain the charge within the unit. The unit is shipped with the valve stems closed and caps installed. Do not open the valves until the system is evacuated.
1.Connect the vacuum pump with
2.Evacuate the system to 250 microns or less using suction and liquid service valves. Using both valves is necessary for some compressors create a mechanical seal separating the sides of the system.
3.Close pump valve and hold vacuum for 10 minutes. Typically pressure will rise during this period
•If the pressure rises to 1000 microns or less and remains steady the system is considered
•If the pressure rises above 1000 microns but holds steady below 2000 microns, moisture and/or noncondensibles may be present or the system may have a small leak. Return to step 2: If the same result is encountered, check for leaks as previously indicated and repair as necessary then repeat evacuation.
•If pressure rises above 2000 microns, a leak is present. Check for a leaks as previously indicated and repair as necessary then repeat evacuation.
Manifold valve
Low pressure side valve |
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| Charging hose | ||
Charging hose |
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B | A |
| Vacuum pump |
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Caution:
Refrigerant must not be discharged into the atmosphere.
After connecting the piping, check the joints for leakage with a gas leak detector.
