Frigidaire FFHP124CS1 Installation Instructions - Page 23

When using the vacuum pump For method of using a manifold valve, refer to its operation manual. 1. Completely tighten the flare nuts at connection point A, B, C and D. Connect valve core removal tool to the charging port, then connect vacuum hose to valve core tool. Open the schrader valve. Note: The schrader valve is inside the charging port. 2. Connect the other charge hose of manifold valve to the vacuum pump. 3. Fully open the Low Side handle of the manifold valve. 4. Operate the vacuum pump to evacuate. After starting evacuation, slightly loose the flare nut of the Low Side valve on the gas pipe side and check if the air is entering (Operation noise of the vacuum pump changes and a compound meter indicates 0 instead of minus), then tighten the flare nut. The procedure verifies if there are blocks inside the tubes. 5. Make evacuation for 15 minutes or more and check that the compound meter indicates -7-3/5 x 10 Microns Hg (-1x10 Pa). After the evacuation is completed, fully close the Low Side handle of the manifold valve and stop the operation of the vacuum pump. 6. Turn the stem of the packed valve B about 45o counterclockwise for 6~7 seconds after the gas comes out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is Outdoor unit Indoor unit Manifold Valve -76cm/Hg Charge Hose Low Side High Side Charge Hose Vacuum pump a little higher than the atmospheric pressure. This procedure verifies if the refrigerant goes through the tubes correctly. 7. Close the schrader valve, then remove the valve core tool. Replace the charging port cap. 8. Fully open the packed valve stems B and A. 9. Securely tighten the cap of the packed valve. Purging the system 22