Assessments - 3, GPA: 3.7
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Keep pipe facing downward when removing burrs. Reamer Pipe Pipe cutter PIPING INSULATION Insulation Liquid and suction lines must be insulated separately. In a cooling only type air conditioner, both pipes become cold during operation. This can cause moisture to Narrow Pipe Wide Pipe condense on the surface of the pipes, Common insulation resulting in heat loss. Separate insulation is essential PRECAUTIONS WHEN BENDING PIPES . The air conditioner's performance will suffer if the piping is crushed. . Bend pipes using the pads of your thumbs to prevent them from collapsing (See picture on the right.) . Use a pipe bending tool to bend pipe wider than 1/2" in diameter. FLARE FITTING CONNECTION. There are 3 piping rules: (a) DRY: Never allow any water to get(b) CLEAN: Never allow dirt, sand or other inside the piping. foreign particles to get inside the piping. Cap Cap Keep cap attached until immediately before making piping connections. Bend with pads of thumbs Pipe bending tool b/a = 0.7 or more Keep cap attached until immediately before making piping connections. (c) PRECAUTIONS WHEN CONNECTING PIPES: Connections will go more smoothly if the large pipe is connected first, followed by the small pipe. Hold the nipple and the flare nut straight and lightly turn the nut two or three turns by hand to ensure that the threads are aligned. Then tighten to the specified torque using a wrench. In particular, when tightening 1/4" diameter flare nuts, use the specified torque wrench First, 2 or 3 turns by hand Nipple Flair nut Fix in place. Always look at arrow on torque wrench to determine direction. Torque wrenchWrench Torque wrench Fan Coil . Align the center of both flare fittings and tighten the flare nut with your hand. . With a torque wrench tighten the flare nut fully. Outdoor unit Liquid side piping Condensing Units Gas side piping . Align the center of the flare nut of the liquid line to the liquid valve. Tighten the flare nut, first with your hand and then fully tighten with the torque wrench. . Align the center of the flare nut of the gas line to the gas valve. Tighten Torque wrench the flare nut with your hand. After purging, tighten it fully with a torque wrench and check all connections for leaks with soap solution. AIR PURGING This procedure is used to remove air from inside the piping connecting the indoor and outdoor units, as well as the air inside the indoor unit. If air purging is not carried out, air will beocme mixed into the refrigerant cycle, causing the pressure to rise to abnormally high levels, increasing power consumption and reducing the capacity of the unit. Also, moisture in the air can cause insulation failure in the compressor motor and deterioration of the refrigerant oil, resulting in a significant reduction in the air conditioner life. The procedure is as follows: . Confirm that all piping connections have been completed correctly. . Connect a gauge manifold and a vacuum pump as shown in the diagram. . Completely open the low-pressure valve of the gauge manifold and completely close the high-pressure valve. . Start the vacuum pump and allow it Gauge Manifold to operate until the pressure is at 29” of vacuum. This will take about 15 minutes or more. . With the low-pressure valve completely open, switch off the vacuum pump. . Completely open both the suction and liquid service valves. . Disconnect the manifold. . Tighten the caps on the service valves and the flange nut on the charging port. High pressure valve Vacuum pump Wide pipe service valve Narrow pipe service valve Low pressure valve DRAIN PIPE CONNECTION The fan coil is equipped with a drain hose. It is tied together with the refrigerant piping. During installation, it is important to observe the following instructions to prevent water overflowing from the drain pan. . Insure that the indoor unit is level and not tilted forwards or backwards. The lack of a . Insure that the drain hose does not rise downward above the drain pan. It should be sloping slope causes water to build towards the hole. up and . Route the drain hose through the same overflow the Traps drain pan. hole as the refrigerant pipes. . If the drain pipe extends horizontally a long way, use PVC tubing to provide heat Even if there is a downward slope overall, ins...
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