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7615 Purge air from system

See this article for general troubleshooting (includes schematic and call-outs), 7615 Schematic and Drawing for Troubleshooting

Use the below procedure to purge air from the 7615 controller


  • Check supply pressure: Air supply should be regulated between 90-100 psi.
  • Remove top enclosure of 7615 controller so you can watch the pump discharge (make pressure) and recharge.

Purge Air

  • With the system vented and the TEST port plugged, loosen the gland but do not remove it.
  • Set the unit to control at 10% FS. (Note: Once you start controlling, fluid should start coming out of the loose fitting).
  • Before the pump recharges tighten the gland. Failure to tighten the gland before recharging will re-introduce air into the unit.
  • Repeat step 1-3 until all air has been removed.

If you don't get any oil and the pump is moving back/forth then you might need to loosen fittings closer to the pump per the below image. Loosen the fittings in sequence; 1, 2, 3. Do not let the pump recharge while a fitting is loose or air will be sucked into the system.


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