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Pneumatic Pressure Alarm – Pool Systems

Resolving pneumatic pressure alarms caused by incorrect switch settings

Applies to

Pool filtration systems with pneumatically actuated valves and air pressure monitoring.

Symptom

The system triggers a pneumatic pressure alarm, even though:

  • The compressor pressure is stable (typically 6–8 bar)

  • Pressure only drops briefly when valves are operating

  • No obvious air supply issues are observed

Expected behaviour

  • The pneumatic pressure switch is designed to trigger an alarm only if air pressure drops below 1 bar

  • At normal operating pressure, the alarm should not activate

  • The pressure switch can be re-set if the setpoint has been unintentionally changed

Most common cause

In most cases, the issue is caused by the pressure switch being re-edited at an incorrect pressure level.

This can happen if:

  • The “Edit” function was pressed while the air pressure was too low

  • The switch now interprets a higher pressure as “NOT OK”

This results in false alarms, even though the compressor pressure is sufficient.

Step-by-step procedure

  1. Reduce the air pressure

    • Slowly reduce the regulated air pressure to approximately 1 bar

    • Confirm the pressure on regulation gauge

  2. Re-edit the pressure switch

    • Press “Edit” on the pressure switch

    • This defines:

      • Pressure above 1 bar = OK

      • Pressure below 1 bar = NOT OK

  3. Increase the pressure again

    • Increase air pressure back to normal operating range (6–8 bar)

    • Observe the system status

Status indication

  • Yellow light ON → Pressure OK

  • No yellow light → Alarm active

If the yellow light is on and the alarm is cleared, the pressure switch is correctly set.

Additional checks

  • Verify the alarm delay setting in the control system
    (typically Alarm 3 for pneumatic pressure)

  • Confirm that the air supply remains stable during valve operation

  • Check for leaks in the pneumatic system

Important notes

  • The 1 bar limit is hard-coded in the pressure switch

  • Disabling the pneumatic pressure alarm is not recommended

  • The issue is almost always configuration-related, not a hardware failure

When to contact LiqTech Service

Please contact LiqTech Service if:

  • The pressure switch cannot be re-edited

  • The alarm remains active with verified pressure above 1 bar

  • The pressure indication is unstable or inconsistent