Just purchased a Honeywell Pressure switch p/n HK06NB124. The two ports on the switch are labeled P1 and P2. Does onyone know which one goes to the burner enclosure and which one goes to the collector box?
However if you mix them up it won't fire up and will give you a open pressure switch error code. Then reverse them and if it works you have them done properly. It works off differential pressure. To be safe after that go plug/cover the intake pipe with a plastic bag and try start it. It should not fire and will give you a pressure switch open code.
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