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Compression Coupling
Why is my Low Pressure Cut-Out switch nuisance tripping?
Nuisance tripping of a Low-Pressure Cut-Out pressure switch can occur for the following reasons.
#1 -The Cut in pressure is set too close to the pressure tanks pre-charge. There should be a minimum of 2-5 PSI difference.
EXAMPLE: If switch cut-in is 30 PSI tank pre-charge should be 25-28 PSI maximum.
TIP: Setting at higher 5 PSI difference will reduce the risk of nuisance tripping.
Other factors to consider:
- Pressure Switches are not individually tested for pressure settings, a switch with a 30-50 setting could possibly be set 28-48.
- Pressure Switches will sometimes stick slightly – The same switch could possibly come on 1 or 2 PSI different one cycle to the next.
- Change in ambient temperature can affect the pre-charge pressure in the tank. It is common that nuisance tripping will occur when the seasons change affecting the ambient temperature at the tank location. For example if a system is set up in the winter with a 2 PSI difference between the pump cut-in and the tanks pre-charge pressure, you may see nuisance tripping when heading into the spring / summer season. As the ambient temperature increases around the tank, the air inside the tank warms and expands increasing the internal tank pre-charge pressure eliminating the required minimum of 2 PSI pressure difference.