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SERVICE HANDBOOK
Checking for Adequate Compressor Pumping
Before checking for adequate compressor pumping, you should have already checked
for compressor electrical problems as outlined in “Identifying Compressor Electrical Prob-
lems” on pages 40-41.
To check for adequate pumping, connect service gauges to system (add line taps if neces-
sary). Then turn on power to system. If the system has an adequate refrigeration charge,
the compressor should maintain at least 150 psig pressure difference between suction
and discharge. If the compressor does not pump adequately, it must be replaced with no
further testing.
Is Your Compressor Eligible for Return Under Warranty?
Authorized Tecumseh wholesalers are asked to test every in-warranty compressor that is
returned to them. The Tecumseh factory tears down and examines a representative sam-
ple of compressors returned by authorized wholesalers and notes the reason for failure.
In the field, it can be determined if a compressor is eligible for return under warranty by
FIRST checking for electrical problems and then checking for adequate compressor pump-
ing. If the compressor passes all electrical troubleshooting tests and pumps adequately,
the compressor is operating properly, and the problem lies elsewhere in the system.
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