Panasonic CS-KS30NKU Technical & Service Manual

Contents

27(5) With the vacuum pump still running, close the “Lo”knob of the manifold valve. Then stop the vacuumpump.(6) With the hex wrench, turn the valve stem on the nar-row tube service valve counter-clockwise by 90degrees (1/4 turn) for 10 seconds, and then turn thestem clockwise to close it again. (Fig. 58)(7) Leak test all joints at the tubing (both indoor and out-doors) with soapy water. Bubbles indicate a leak. Tight-en the joint more when leaks, then check if there is noleak. Be sure to wipe off the soap with a clean cloth.(8) With the hex wrench, turn the wide tube servicevalve stem counter-clockwise to fully open the valve.(9) Turn the narrow tube service valve stem counter-clockwise to fully open the valve.(10) Loosen the vacuum hose connected to the widetube service port slightly to release the pressure.Then, remove the hose.(11) Fasten the valve cap on the wide tube service portsecurely with an adjustable wrench or box wrench.Next, mount the valve cap on the service valve andtighten it to 170 lbs·in (200 kgf·cm) with a torquewrench. This process is very important to preventgas from leaking from the system.(12) Test run the air conditioner. (See next page.)(13) While the air conditioner is running, apply liquidsoap to check for any gas leaks around the servicevalves or caps.(14) If there is no leakage, stop the air conditioner.(15) Wipe off the soap on the tubing.This completes air purging with a vacuum pump and theair conditioner is ready for actual operation.CAUTION Be sure to completely insertthe hex wrench beforeattempting to turn the valve.Fig. 58CAUTION This may cause the refriger-ant gas to leak. In order toavoid this, take off the hosequickly.Valve capNarrow tubeHex wrenchWide tubeVacuum hose to manifold valve90 (1/4 turn)