Quincy Compressor 50093-103 - Manual (Page 63)

57
POOR PROCESS PRESSURE
PROBABLE CAUSE CORRECTION
Leak Leak check system and compare to original rate of rise
pressure test. Look for damaged gaskets and leaks in
check/isolation valves- Check for leaks in inlet valve, and
piping to airend.
Pump is cold Allow adequate warm-up time for pump to reach operating
temperature.
Low fluid level Fill fluid reservoir to proper level.
Condensation or contamination in
fluid Replace pump fluid.
Shaft seal leak Replace shaft seal.
Drive motor RPM too low Check and replace motor as necessary.
Excessive back pressure/separator
clogged Replace separator element-keep exhaust at atmospheric
pressure.
Temperature of system or process
gas increasing Increases in temperature translate into ACFM load. Keep
temperatures constant.
Vapor load being generated Possible leak in water cooling jacket or water piping in
vacuum system. Leak check.
Materials of construction Materials not compatible with vacuum service. Observe all
vacuum engineering conventions.
Clogged inlet filter Replace inlet filter element.
Inlet valve not opening fully Correct the situation in accordance with the instructions in
"Inlet Valve Not Opening or Closing in Relation to
Demand" section of the trouble-shooting guide.
Differential pilot valve not set
correctly Readjust differential pilot valve to achieve desired
modulation range.
Vacuum switch not set correctly Readjust the vacuum switch to the desired cut-in and cut-
out pressures.
Faulty vacuum gauge Replace vacuum gauge.
Wrong fluid Replace with recommended fluid.