Fisher & Paykel RX256DT4X1 FP Service Manual page 99

5. After compound gauge (low side) drops to approximately 29 inches gauge, open valve "C" to
vacuum thermocouple gauge and take micron reading.
NOTE: A high vacuum pump can only produce a good vacuum if oil in pump is not contaminated.
6. Continue evacuating system until vacuum gauge registers 600 microns.
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