Enclosure pressure control valve will not hold a safe 0.5 inch (12.7mm) pressure
Possible Causes
Leakage around gasketing covers, seams, piping and tubing connections, conduit connections and electrical conduit seals of the enclosure

Corrective Action
Tighten enclosure latches: Where tightening is not feasible, and gasketing materials are not practical, holes or gaps can be closed with silicone sealant applied from inside the protected enclosure

Enclosure pressure gauge reading is difficult to stablize
Possible Causes
Insufficient enclosure leakage or opening of the venturi orifice is crimped too small

Corrective Action
Remove the orifice, cut off the crimped end and ream the tube, then recrimp and reinstall the tube to note effect. As tube is shortened, reamed and recrimped, sensitivity decreases, allowing easier adjustment of setpoint on the enclosure pressure gauge

EPCU indicator or indicators are 'blinking'. Solenoid valve does not engage. Peripheral functions are non-operative.
Possible Causes
Loose wiring or connection. EPCU logic failure. Shorted or broken wire.

Corrective Action
Isolate particular LED or LEDs that are 'blinking.' Individual LEDs indicate a problem with a particular function. Check all peripheral and internal wiring connections. All LEDs indicate EPCU logic problem

Rapid Exchange flow and/or Rapid Exchange timer LEDs do not illuminate
Possible Causes
Insufficient Rapid Exchange injection pressure. Air leakage from protected enclosure. Shorted or broken wire.

Corrective Action
Increase Rapid Exchange injection pressure, 60PSI (4.14 bar) minimum. Check enclosure seals. Ensure all conduit & wiring connections are sealed.

Problem persists, or if the system does not appear to be operating properly
Possible Causes
Unknown

Corrective Action
Contact Pepperl+Fuchs Applications / Customer Service Department at 330-486-0002 or sales@us.pepperl-fuchs.com.

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