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NOTE: All 06D compressors and 06CC (16 to 37 Cfm)
compressors have one sight glass on the side of the crank-
case. All 06E compressors and 06CC (50 to 99 Cfm) com-
pressors have two sight glasses, on the oil pump end of the
compressor.
Parallel compressor applications typically use an oil-con-
trol float system consisting of individual floats, a separator
and an oil reservoir. When using a float system, do not inter-
connect the floats with an “equalization system” without
approval from Carlyle application engineering. The use of
a
float “equalization system” can result in system oil control
problems.
An oil equalization line can be used instead of a float sys-
tem, except with 06CC compressors. The equalization line
and the compressors must be level
, and the line diameter
must be large enough to allow both the refrigerant and oil to
equalize between all the interconnected compressors. If the
line is not level, it is undersized or the system contains too
much oil, the oil level will rise filling the line, and oil con-
trol between compressors will be lost. Typically, equaliza-
tion lines are 1-1/8 in. (28 mm) in diameter or larger. For
06D compressors, a sight glass in the line is required to
determine the system oil level.
Parallel systems using three (3) or more 06E compressors
require the use of a common motor barrel interconnection
line between compressors. Use of an interconnection line is
strongly recommended on two (2) 06E compressor unit
configurations. This system prevents oil from building up in
an 06E motor barrel during the off cycle, thereby preventing
an oil slug on start-up. The line is either 1/4 in. (6 mm) or
3/8 in. (8 mm) tubing inter-connecting to fitting located in
the bottom of the 06E crankcases. To connect the 06E com-
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