Apeks Supercritical The Duplex™ Operation Manual
35
Revision Date 8/28/2018
Appendix B.
Diaphragm Pump Priming.
a) Open BOTH of the Oil Bypass Valves (one on each head), see figure below, by turning
counterclockwise until it stops
b) Go to the “Manual Screen” on the HMI and hit the “Start Prime Compressor” button.
c) When pump is priming verify there is oil pressure on the pump gauges, if no pressure appears check oil
level and pump motor rotation.
d) Continue to let the pump run 5 to 7 min to remove any entrained air in compression head.
e) Begin to close over pump bypass valve slowly, 1 full turn every 3 to 4 seconds, alternating heads every
3 to 4 turns until both valves are fully closed. Tighten the oil bypass valve as tight as possible to fully
close.
f) From the “Manual Screen” hit the “Stop Prime Compressor” button.
g) Start the system to see if pump is pumping properly.
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