Section 4
INSTALLATION
36
should fill 1/2 of the upper sight glass when the
compressor is shutdown. When the oil level falls
below the center of the lower sight glass, fluid must
be added.
4.6 FLUID PIPING (REMOTE AIR-COOLED OPTION
ONLY)
To allow de-pressurization of the cooling package
and connecting piping between the compressor and
the cooling package upon shutdown of the com-
pressor, a 1/2”(13 mm) de-pressurization line must
be installed between the top of the fluid cooler and
the sump tank connection which is located on the
fluid supply and return line connection bracket. This
line must be maintained at a higher level than the
supply and return piping for the fluid cooler.
The supply and return piping for the fluid cooler
must be adequately sized to prevent excessive
pressure drop. The total pressure drop in the supply
and return piping and associated fittings and valves
shall not exceed 10 psig (0.7 bar)at the worst case
operating condition (usually lowest ambient). If the
pressure drop is in excess of 10 psig (0.7 bar), a
pump should be installed. Consult the Sullair
Service Department for recommendations.
It is recommended that shutoff valves be installed in
the supply and return piping to facilitate compressor
component’s maintenance.
Because of the variability in installations, the fluid
necessary to fill the supply and return piping for the
fluid cooler is not part of the standard scope of sup-
ply for the compressor. The fluid necessary to fill
this piping may be ordered from the nearest Sullair
Figure 4-1 Service Air Piping (Typical Installation)
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