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All installations and services must be performed by qualified personnel.
5
C. TUBING INSTALLATION
The compressor oil is constantly pumped through the liquid line, evaporator coil, and back through the
suction line in normal operation of an Air Conditioning system. Please follow the guide lines listed below to
insure proper lubrication of the compressor by avoiding oil accumulation at undesirable points in the
system.
1. No traps in the suction line are necessary if the outdoor condensing unit is level with the indoor
evaporator coil or the indoor evaporator coil is 4 feet or less lower than the outdoor condensing unit. Any
horizontal runs of suction line should have minimum 1/2" pitch towards the outdoor condensing unit for
every 10 feet of line.
2. A trap is necessary in the suction line at the indoor evaporator coil if the indoor evaporator coil is more
than 4' below the outdoor condensing unit and 1 trap per every 10’ of vertical rise thereafter.
: A gradual loop in the tubing can be constructed to take up the excess tubing if you find that
too much tubing has been brought onto a job. Such a loop MUST
be kept in a horizontal (flat) plane to
avoid trapping the oil. Refrigerant lines should be inserted into a suitable conduit or raceway when the lines
are to be buried between the building and the outdoor condensing unit. The lines must be provided with
sufficient protection and support to prevent damage when installed above the ground.