How do you calibrate a differential pressure switch?

Connect the variable pressure source to a test gauge and the HI side pressure port of switch. Raise pressure and note test gauge reading when circuit closes. Slowly drop pressure and note test gauge reading when circuit opens. Adjust set point screw to increase or decrease set point.

How do you calibrate a Danfoss pressure switch?

To make adjustments to your low side, use a screwdriver to turn the spindle clockwise to lower the value and counterclockwise to raise the value. To make adjustments to your differential, turn the spindle clockwise to raise the value and counterclockwise to lower the value.

What happens at set point on a pressure switch?

The switch opens and closes a contact at a specific pressure referred to as the set point. The set point may be fixed or adjustable. Selecting a pressure switch with a switch point in the proper operating pressure range is important to ensure accuracy and longevity.

How do I know if my pressure switch is bad?

Here are some tell-tale signs that your pressure switch is beginning to fail:

1. Your water pressure is at or above the cut-out pressure, yet the pump doesn’t turn off.
2. Your pump doesn’t turn on at the proper cut-in pressure.
3. You have low water pressure even though the pump is running.

How high can I set my pressure switch?

Note: Never set the cut-off pressure setting above 60 psi. Some commercial tanks are capable of withstanding higher pressures, but for the safety of your home, you should never let the cut-off setting exceed 60 psi. Pressures higher than 60 psi can damage your pipes, fittings, and switches.

Why is my pressure switch not working?

If your switch won’t turn on, this could be a sign your tank pressure is above your switch’s cut-in pressure. Try running some water elsewhere in the building to reduce pressure below the cut-in level. You can also try gently tapping on the pressure gauge, the switch, and the tank.

How do you reset a pressure switch?

Instructions to Reset Low Water Cut Off Pressure Switch

1. Locate pressure switch.
2. Locate the reset lever.
3. Locate the AUTO / START / OFF positions.
4. Locate the pressure gauge.
5. Move the reset lever up into the start position and hold it there.

How do pressure switches work?

Pressure switches rely on water pressure to do all the work. The change in pressure that activates the switch is provided via the water from the well. The pressure moves up through the diaphragm which presses against a piston and spring, which in turn opens or closes the contacts.