To set the pressure on a water pressure tank, the crucial step is to adjust the tank's air pressure to be 2 psi below the pump's pressure switch cut-in setting. This adjustment is done after the system is depressurized.
Here are the steps on how to set the air pressure in your water pressure tank, based on standard procedures:
Steps to Adjust Pressure Tank Air Charge
Adjusting the air charge in your pressure tank ensures your pump operates efficiently and prolongs the life of both the pump and the tank.
- Depressurize the System: With the pump breaker OFF, open a faucet (preferably the lowest one in your house) and drain the tank of all water. This is essential for an accurate air pressure reading.
- Locate and Access the Air Valve: Find the Schrader-type air valve on the top or side of the pressure tank. Remove the protective air valve cap.
- Check Current Air Pressure: Use a tire pressure gauge (or a dedicated air pressure gauge) to check the pressure in the tank.
- Adjust Air Pressure: Release air from the valve if the pressure is too high, or add air using an air compressor or bicycle pump if it is too low. Adjust the pressure until it is 2 psi below the pump's pressure switch cut-in setting. For example, if your pump turns on at 40 psi (cut-in setting), the tank's air pressure should be set to 38 psi when empty.
- Replace Cap and Restore Power: Once the pressure is set correctly, replace the protective air valve cap. Close the faucet and turn the pump breaker back ON.
This procedure ensures that when the pump starts, the tank is essentially empty of water but correctly pressurized with air, allowing it to accept and store water efficiently as the pump fills the system.
Reference source: Information derived from how-to guides on setting pressure tank pressure, specifically referencing the method of setting pressure 2 psi below the pump's cut-in point when the tank is empty.
