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48 CLCH-IM-16A
Suction Line Components
Install suction line pressure tap on the leaving side of
the evaporator coil near the TEV sensing bulb
location. Accurate superheat measurement and
thermal expansion valve adjustment demands that
suction pressure be measured near the evaporator
coil.
Usually, suction line filter-driers are only necessary
on systems that have experienced a severe
compressor motor burnout or other failure which
results in extremely high refrigerant temperature. Do
not leave this filter-drier in the suction line
permanently.
Liquid Line Sizing
All compressors have a Refrigerant Charge Limit
(RCL) that must not be exceeded. Since the RCL
and pressure drop are in direct conflict with each
other, Trane recommends that the liquid line be sized
as small as possible, while maintaining a low enough
pressure drop to ensure 5
°
F of subcooling at the
expansion valve.
Suction Line Sizing
Suction line tubes must be sized to maintain
refrigerant vapor velocities that are high enough to
ensure oil entertainment under all operating
conditions.
It is not necessary to pitch horizontal suction lines
toward the compressor when the refrigerant coil is
used with Trane condensing units that are designed
with a gas trap in the suction line just prior to the
compressor.