Sanyo CM1972 Service Manual - Page 81
refrigerant such as R410
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(4) With the "Lo" knob of the manifold valve open and high-pressure valve ("Hi") closed completely, run the vacuum pump. Run the pump until the pressure is -101 kPa (-76 cmHg). The operation time for the vacuum pump varies with tubing length and the capacity of the pump. The following table shows the amount of time required for evacuation: Table 5 Required time for evacuation when capacity of 100 liter/h vacuum pump is used 20 min. or more NOTE The required time in the above table is calculated based on the assumption that the ideal (or target) vacuum condition is around 10 mmHg abs. (5) With the vacuum pump still running, close the "Lo" knob of the manifold valve. Then stop the vacuum pump. Fully close the low-pressure valve and stop the vacuum pump. (Wait 1 - 2 minutes and check that the manifold gauge pointer does not return. If it does return, find and repair the leak, then apply the vacuum again.) (6) With a hex wrench, turn the valve stem on the narrow tube service valve counter-clockwise by 90 degrees (1/4 turn) for 10 seconds, and then turn the stem clockwise to close it again. CAUTION Be sure to completely insert the hex wrench before attempting to turn the valve. (7) With a standard screwdriver, turn the wide tube service valve stem counterclockwise to fully open the valve. (8) Turn the narrow tube service valve stem counterclockwise to fully open the valve. (9) Loosen the vacuum hose connected to the wide tube service port slightly to release the pressure. Then, remove the hose. (10) Leak test all joints at the tubing (both indoor and outdoors) with liquid soap. Bubbles indicate a leak. Be sure to wipe off the soap with a clean cloth. CAUTION If a CFC gas detector is used, use a special detector for HFC refrigerant (such as R410 and R134a). 19