Charging An Evacuated Unit By Weight

TM 10-4110-262-13&P

0031 00

NOTE

If the system will not come down to 500 microns, there may be a leak or

moisture in the system or in the evacuation and charging equipment

hoses. Find and repair the leak.

3. Close the valve at the evacuation pump, stop the vacuum pump, and observe the reading on the

vacuum gauge for 5 minutes. The pressure should not exceed 2000 microns.

4. If pressure does exceed 2000 microns, repeat Step 2. This time, if the pressure exceeds 2000

microns within 5 minutes, look for a leak in the system or in the evacuation and charging equipment

hoses. Find and repair the leak.

5. Open the vacuum valve at the vacuum pump, start the vacuum pump, and evacuate the system to

500 microns.

6. When the system reaches 500 microns, close the manifold gauges and turn off the vacuum pump.

The system is now ready to charge.

Charging An Evacuated Unit By Weight

1. Install a manifold gauge assembly. Keep the unit turned off.

2. If the system is not evacuated, recover the refrigerant and evacuate the system as described above.

3. Place the refrigerant bottle on a scale and attach the manifold's service line.

4. Record total refrigerant and container weight.

NOTE

The ADR-300 will require 4.62 lb of refrigerant.

5. Purge air from the service line as required. Open the bottle to withdraw liquid.

6. Gauge the compressor discharge service valve.

7. Open the high side hand valve all the way on the manifold gauge assembly and begin charging the

unit.

8. Watch the scale and close the high side valve at the refrigerant bottle when 4.62 lb have been added.

If refrigerant flow stops before charging is complete, add liquid to complete charging as described

below.

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