16
2. After the compressor has run 10 to 15 minutes and no
liquid floodback is evident, completely open suction ser-
vice valve. The other compressors within the system
should be started in the same manner.
3. To ensure operating oil levels are within acceptable lim-
its, closely observe the oil level in the compressors until
the system has stabilized. During operation all refrigera-
tion systems will lose some compressor oil to the system
because:
• All systems have a film of oil on the inside surface of
the piping. At start-up, the lines are dry and the oil
which coats the lines comes from the compressor crank-
case.
• Oil also traps in the low refrigerant velocity area of the
system and must be made up by adding oil to the sys-
tem. On systems with hot gas defrost, inspect the com-
pressor for excessive oil after the defrost cycle has been
completed.
The oil lost to the system must be replaced, but make sure
not to add too much. The 06E and 06CC (50 to 90 Cfm)
compressors have been successfully started in supermarket
refrigeration configurations by adding only 1 quart (liter) of
additional oil per compressor. The amount to be added will
vary depending on the system, but keeping the oil level
between 1/8 and 3/8 level in the sight glass will eliminate
the chance of excessive oil charges.
CAUTION
Adding excessive oil to the 06E and 06CC (50 to 99 Cfm)
compressors can cause blown gasket problems.
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