This orifice is designed for a 3/16-inch tube connection

including 17D

the mainline air volume would overwhelm the thermostat's bleed action

soot accumulation

Enviro-tec PE-05-1301 Contactor This orifice is designed forThe Enviro tec PE 05 1301 Contactor is a reliable 1 pole 30 amp 24V contactor designed for high performance switching in HVAC systems and commercial air handling units. Operating with a 24V coil voltage, this definite purpose contactor is engineered to manage inductive loads like compressors and condenser fan motors. Its single pole configuration allows for a secondary shunt to maintain a constant feed for crankcase heaters, protecting critical