When installing this Barber Colman valve

this large inner access door is designed to maintain the pressurized integrity of the heat exchanger cabinet while providing a secure seal against combustion byproduct leakage

This specific model is a 230V single-phase component

this 586 series heavy duty contactor is a standard-issue component for HVAC heating systems

Maxon 200SMA21AA11BB11A0 Gas Valve 322027-701 When installing this Barber ColmanThe Maxon 200SMA21AA11BB11A0 is a heavy duty 2 inch ANSI threaded gas valve designed for high capacity industrial burner systems. Featuring a standard port flow configuration and a normally open 2 way operation, this cast iron gas shut off valve is built for general purpose applications where reliability is non negotiable. The unit utilizes Buna body O rings and a bumper for superior sealing performance. With 115Vac 60Hz solenoid and motor voltages,