Panasonic CS-A7DKD Service Manual

Panasonic CS-A7DKD Service Manual Manual pdf 57 page image

Required tools: hexagonal wrench, adjustable wrench, torquewrenches, wrench to hold the joints and gas leak detector.The additional gas for air purging has been charged in theoutdoor unit.However, if the flare connections have not been done correctlyand there gas leaks, a gas cylinder and the charge set will beneeded.1. Recheck the piping connections.2. Open the valve stem of the 2-way valve counter-clockwise approximately 90°, wait 10 seconds, andthen set it to closed position.• Be sure to use a hexagonal wrench to operate the valvestem.3. Check for gas leakage.• Check the flare connection for gas leakage.4. Purge the air from the system• Set the 2-way valve to the open position and remove thecap from the 3-way valve’s service port.• Using the hexagonal wrench to press the valve core pin,discharge for three seconds and then wait for oneminute.Repeat this three times.5. Use torque wrench to tighten the service port cap to atorque of 1.8 kg.m. (18 N.m).The air in the indoor unit and in the piping must be purged. If airremains in the refrigeration pipings, it will affect thecompressor, reduce the cooling capacity, and could lead to amalfunction.6. Set the 3-way valve to the opened position.7. Mount the valve stem nuts to the 2-way and 3-wayvalves.8. Check for gas leakage.• At this time, especially check for gas leakage from the 2-way and 3-way’s stem nuts, and from the service portcap.CautionIf gas leakage is discovered in step (3) above, takethe following measures:Tighten the piping connections. If the leaks stop,continue working from step (4).If the gas leaks do not stop when the connections areretightened, repair the location of the leak, dischargeall of the gas through the service port, and thenrecharge with the specified amount of gas from a gascylinder.11.1. Air Purging of the Piping and Indoor Unit11.1.1. Air purging (Installation)Service port capBe sure, using a torque wrench to tighten the service port cap (after using the service port), so that it prevents the gasleakage from the refrigeration cycle.Procedure:57CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12DKD /