A LOOK AT SERVICE SAFETY
Installation and Replacement Information
107
F. Test for Acidity If Multiple Motor Failures
Have Occurred
If the system has suffered multiple motor failures, it
is advisable that the oil of the replacement be tested
after Section E and judged acid free before the sys-
tem is considered satisfactorily cleaned. An oil sam-
ple may be taken from a hermetic system if at the
time the replacement compressor was installed an oil
trap is installed in the suction line (see Figure 5-12).
When the trapped oil level appears in the sight glass
(less than an ounce is needed) the oil may be slowly
transferred to the beaker of the acid test kit as avail-
able from several manufacturers. A reading of less
than 0.05 acid number is an indication that the sys-
tem is free of acid. A reading of higher than 0.05
means continued cleaning is required. Return to B2
on page 105.
G. Monitor the System
The above procedure for the cleanup of hermetic
systems after motor failure through the use of suc-
tion line filter-drier will prove satisfactory in most
instances provided the system is monitored and kept
clean by repeated drier changes, if such are needed.
The failure to follow these minimum cleanup recom-
mendations will result in an excessive risk of repeat
motor failure.
Figure 5-12.
Method of obtaining oil sample on hermetic system. After satisfactory oil test,
Schrader valve may be capped and the oil sampler taken to next job.
Schrader Valve Vertically Downward
Female Schrader Valve Connection
1/2" Liquid Sight Glass
1/2" Shut Off Valve
2" Minim
um
At Least 6 Diameters
Suction Line