Resideo TH6220U2000 Thermostat 30067439-890 the internal metering orifice is

the internal metering orifice is factory-set to ensure the correct rate of liquid and oil return to the suction line

This well is specifically bored for a 7/16" diameter bulb

This part is frequently used to resolve intermittent furnace ignition and "no flame sensed" errors

ensuring the inducer motor generates sufficient negative pressure before the ignition sequence initiates

featuring a 350 PSI burst pressure rating

Resideo TH6220U2000 Thermostat 30067439-890 the internal metering orifice isThe Resideo TH6220U2000 is a versatile T6 Pro Programmable Thermostat engineered for multi stage applications, supporting up to 2 Heat 2 Cool Conventional Systems and 2 Heat 1 Cool Heat Pumps. Designed with a flexible scheduling architecture, it allows technicians to configure 7 day, 5 1 1 day, 5 2 day, or non programmable modes depending on the clients preference. This unit operates on 20 30 Vac and offers dual power options, running via C wire