LG LCU240CP Service Manual - Page 49

(1) Pumping down Indoor unit (3-way) Valve Liquid side Open 3-Way valve Outdoor unit Gas side Closed 3-Way valve Lo CLOSE CLOSE Purge the air • Procedure For pumping down,firstly short the Low Pressure s/w at the outside and then operate below procedure. 1. Confirm that both the gas side and liquid side 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 manifold gauge to the service port of the gas side valve. - Connect the hose of the gauge with the push pin to the service port. 4. Air purging of the charge hose. - Open the Low-handle valve on the gauge slightly to air purge from the hose. 5. Set the liquid side 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 gas side valve to the closed position. - Do this quickly so that the gauge ends up indicating 1kg/ g. 8. Disconnect the charge set, and mount the liquid side and gas side valve caps and the service port nut. - Use torque wrench to tighten the service port nut to a torque of 1.8kg.m.(4.2kg.m/5.5kg.m) - Be sure to check for gas leakage. • Be sure to short pressure S/W. otherwise Low pressure S/W detect low pressure skete and stops the compressor. Service Manual 49