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exceeds the minimum velocity in Table 10
Minimum discharge line velocities for oil
entrainment and remains below 3500 fpm.
4) Prevent oil and condensed refrigerant from
flowing back into the compressor during
“off” cycles by:
a) pitching the discharge line toward the
condenser, and
b) routing the discharge line so that it rises
to the top of the condenser, then drops
to the level of the condenser inlet,
creating an inverted trap.
5) Double risers are generally unnecessary.
The scroll compressors in FWCD Series
chillers unload to the extent that a single,
properly sized riser can transport oil at any
load condition.
6) Riser traps are also unnecessary. Avoid
using riser traps. If the discharge riser is
sized to maintain the proper refrigerant
velocity, adding a trap will only increase
the pressure drop.
Table 10 Minimum discharge line velocities
for oil entrainment
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