How do I prevent intake contamination with this kit

and Thermal Zone air handlers and furnaces

If the SWT3927 is opening frequently

Engineered as a normally closed (NC) electronic switch

With a maximum safe working pressure typically rated up to 500 psig

Conbraco 61-104-01 Check Valve Els PW 17895 How do I prevent intakeFor mid sized hydronic and steam systems, the Conbraco 61 104 01 Check Valve provides a rugged, inline solution to prevent backflow and protect upstream equipment. This 3 4" female NPT spring actuated bronze CVB ball cone check valve is built with a heavy duty ASTM B584 bronze body and a chemically resistant RPTFE ball cone, ensuring a tight seal even in demanding chemical service or saturated steam applications up to 125 psi. The spring loaded design