LG LSC121PMA Service Manual - Page 37

2. Pumping down Indoor unit Liquid side Open 2-Way valve Outdoor unit Gas side Closed 3-Way valve Lo CLOSE CLOSE Purge the air • Procedure (1) Confirm that both the 2-way and 3-way valves are set to the open position. - Remove the valve stem caps and confirm that the valve stems are in the raised position. - Be sure to use a hexagonal wrench to operate the valve stems. (2) Operate the unit for 10 to 15 minutes. (3) Stop operation and wait for 3 minutes, then connect the charge set to the service port of the 3-way valve. - Connect the charge hose with the push pin to the service port. (4) Air purging of the charge hose. - Open the low-pressure valve on the charge set slightly to air purge from the charge hose. (5) Set the 2-way valve to the closed position. (6) Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg/cm2g. (7) Immediately set the 3-way valve to the closed position. - Do this quickly so that the gauge ends up indicating 3 to 5kg/cm2g. (8) Disconnect the charge set, and mount the 2way and 3-way valve's stem nuts and the service port nut. - Use torque wrench to tighten the service port nut to a torque of 1.8 kg.m. - Be sure to check for gas leakage. -37-