Pressure Switch
This pressure switch is a protection to protect the water heater, if there is not enough water pressure entering the tube, the water heater will automatically shut down.
The pressure switch is adjustable from 1 to 6 psi, automatically it is adjusted to 3 psi, if your pump is not strong enough you must unscrew the top wheel which is caught in a drop of silicone.
At the time of installation it is best to do a test and turn off the pump to see if it is properly adjusted and if it does the job of stopping the water heater automatically.
