Sensus 143-IRV-1 Regulator 30067439-890 or a failing draft inducer

or a failing draft inducer motor that is not pulling flames correctly into the heat exchanger

allowing for a field-serviceable fix without removing the hydrant from the structure

reducing downtime during system maintenance

this part is required for systems where the fan and auxiliary heat are managed through separate contact sets

Sensus 143-IRV-1 Regulator 30067439-890 or a failing draft inducerThe Sensus 143 IRV 1 Regulator is a job site standard for residential natural gas service and light commercial meter sets. Built on the rugged 143 80 chassis, this model features a 1 inch NPT inlet and a 3 8 inch orifice, delivering precise pressure reduction for HVAC burners, unit heaters, and boilers. The integrated internal relief valve (IRV) provides essential overpressure protection, while the green spring is factory calibrated for an outlet