Installation Instructions Boiler Burner Unit
Wiring Basics for Residential Gas Boilers - ACHR News. Oct 10, 2000 · This wiring diagram shows 120 V coming from L1 of a circuit breaker, through a switch, powering a boiler control and returning through L2, back to the neutral bar of the circuit breaker box. This is fine if the boiler is 120 V.
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