Ingersoll-Rand 900829, Руководство по обслуживанию

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Compressor Maintenance
65
New units are built with a set amount of oil in the
refrigeration system. When replacing a
compressor the original factory oil amount should
be maintained. During normal operation oil and
refrigerant circulate through the system, at
shutdown as much as 75% of the oil can stored in
system components.
The goal of oil balance is to identify how much oil
is lost when replacing components during service
activities. Then this lost amount should be the
amount included when replacing components or
repairing the system. Here are some examples:
Example #1 Compressor Change Only
Drain the oil from the compressor drain plug and
all other ports. If possible, turn the clutch (rotating
the internal compressor parts) by hand and drain
the oil again. Repeat until all oil is removed from
the compressor. Measure the amount oil drained
from the compressor. This is the amount that
should be in the new compressor. If 4 ounces are
drained from the failed compressor then 4 ounces
should be the amount in the new compressor.
IMPORTANT: If less than 3 ounces of oil is
drained from the compressor, at least 3 ounces
should be in the new compressor. Do not start
and run a compressor with less than 3 ounces of
oil in it.
Figure 49: Drain and Measure Oil
Figure 50: Turn Clutch If Possible
Example #2 Replacing Compressor and
Drier Change on Multi Temp System
Since oil cannot be drained from system
components these amounts must be estimated
using the chart below (page 66). Oil Drained
Failed Comp Estimated Drier Oil = Oil In
Replacement Compressor 3 oz (from failed
compressor) + 1.0 oz (estimate from chart) = 4 oz
(total oil to add to system)
NOTE: So if the new compressor is delivered
with 6 oz. remove 2 oz.
Example #3 Replacing Compressor, Drier
and Suction Hose on Single Temperature
System
In example # 3, if the new compressor is supplied
with 6 oz then 3 oz should be added to reach a
total of 9 oz. Let's say the new compressor is
supplied with 0 oz or no oil, then the amount to
add would be 9 oz.
Oil Drained From Failed Compressor 4 oz
Estimated Oil From Removed Drier (chart
below) 1 oz
Estimated Oil From Removed Suction Hose
(chart below) 4 oz
Total Amount to be added 9 oz