valutazioni - 4, GPA: 4
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2Type “L” copper tubing. Use these line charges to adjust the system operating charge when the refrigerant lines are more or less than the 25 feet listed in Table 2. 3. Turn the stem in (or clockwise) between 1/4 and 1/2 turn to open the access port. As soon as some internal pressure is relieved, close the access port. DO NOT remove the entire holding charge. NOTE: The copper disc on the liquid connection will prevent any internal pressure from being relieved through the main port of the liquid line stop valve. If the unit has already lost its holding charge, it should be leak tested and the necessary repairs should be made. If the unit has maintained its holding charge, you can assume that it has no leaks and proceed with the installation. CAUTION: Dry nitrogen should always be supplied through a connection while it is being brazed or unbrazed because the temperature required to make or break a brazed joint is sufficiently high to cause oxidation of the copper unless an inert atmosphere is provided. The flow of nitrogen should be continued until the joint has cooled. WARNING The dry nitrogen must always be supplied through a pressure regulating valve. Before installing the liquid line between the outdoor and indoor units, remove the copper disc from the liquid connection on the outdoor unit per the following procedure: 1. Make sure the refrigerant in the line has been recovered and that the liquid service valve on the unit is front-seated and closed. The valve stem should be turned to its maximum clockwise position. 2. Drill a small hole through the disc before unbrazing it to permit a flow of dry nitrogen through the connection while it is being unbrazed. WARNING: This hole is also required to prevent the internal pressure from building up as the disc is being unbrazed and from blowing the disc off. This warning applies to any disc being removed from a service valve, coil connection, etc. 3. Remove the cap from the 1/4" access port on the liquid line stop valve. 4. Connect a supply of dry nitrogen to this access port. 5. Unbraze the copper disc from the liquid connection while maintaining a minimum flow of dry nitrogen through the connection. After the disc has been removed, 1. Burnish the external surfaces of the liquid connection on the outdoor unit and the end of the field-supplied piping being used for the liquid line. NOTE: Clean surfaces are essential for a well brazed connection. 2. Carefully clean the internal surfaces of the above. Any particles left on these surfaces may lead to a future system malfunction. NOTE: Use only copper tubing that has been especially cleaned and dehydrated for refrigerant use. If the tubing has been open for an extended period of time, it should be cleaned before being used. The liquid line connections can now be brazed while maintaining a minimum flow of dry nitrogen through the piping. NOTE: A filter-drier is factory-mounted in the outdoor unit for the heating cycle and in the indoor unit for the cooling cycle. Do NOT install another filter-drier in the field-supplied liquid line because refrigerant will flow in both directions on a heat pump system. Recover the holding charge of the indoor unit and then remove the sealing caps or discs from both its liquid and vapor connections per the following procedure: 1. Make sure the refrigerant in the lines has been recovered, then drill a small hole through both the liquid disc and the vapor disc. If the holding charge has already been lost, the coil should be leak-tested and the necessary repairs should be made. 2. Move the dry nitrogen supply from the access port on the liquid line service valve of the outdoor unit to the hole through the vapor disc on the indoor unit. 3. Unbraze the coil's liquid line disc while maintaining a flow of dry nitrogen across the connection and through the hole in the liquid line disc. Unitary Products Group 035-16192-001-A-1001 4. After the disc has been removed, burnish the external surfaces and clean the internal surfaces as outlined above. 5. Move the dry nitrogen supply back to the access port on the liquid line service valve. 6. Braze the liquid line to the liquid connection on the indoor unit while maintaining a minimum flow of dry nitrogen through the liquid line, the indoor coil and the hole in the vapor disc. 7. Unbraze the disc on the vapor connection of the indoor unit while maintaining the flow of dry nitrogen. 8. After the disc has been removed, burnish the external surfaces and clean the internal surfaces as outlined above. The vapor piping can now be brazed to the vapor connection on the indoor unit while maintaining a minimum flow of dry nitrogen. Before brazing the vapor line to the outdoor unit, make sure the refrigerant in the line has been recovered, then remove the copper disc from its vapor connection per the following procedure: 1. Make sure that the vapor line service valve on the outdoor unit is front-seated and closed with its valve stem in the maximum clockwise posit...
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