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Discharge lines must be sized to ensure adequate
velocity of refrigerant to ensure oil return, avoid
excessive noise associated with velocities that are
too high, and to minimize efficiency losses
associated with friction.
Pitch the hot gas line in the direction of flow for
oil return.
When installing vertical hot gas reheat lines, an oil
drip line must be provided at the lowest point in
the system. The oil drip line must be vertical, its
diameter must be the same as the diameter of the
riser, and a maximum of 10” long. Run an oil
return line, using 1/8 inch capillary tube, 10 feet
in length, from the hot gas reheat line oil drip line
to the suction line. Connect the oil return line
below the sight glass and 1 inch above the bottom
of the oil drip line.
Insulate the entire length of the hot gas line with a
minimum 1 inch thick Armaflex insulation.
Refer to Figure 12 through Figure 19 for piping
diagrams.
Hot Gas Reheat Line Guidelines:
Maintain velocities below a maximum of
3500 fpm. A general minimum velocity guideline
is 2000 fpm.
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