This switch is to be used.
Furnace pressure switch lowes.
Next take off one of the power hoses and blow on it.
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This pressure switch signals the pump to start when the water system drops to 40 psi factory set and stops at 60 psi factory set.
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Single and 3.
First turn the power of the furnace off.
Now use the ohmmeter to check whether the pressure switch is functioning properly.
Use an ohmmeter to check if the pressure switch is opening or closing properly when heat is called for.