Honeywell 420-I Converter 320819-301 or a failure to open

or a failure to open despite receiving 24VAC from the furnace control board

this service valve is designed to manage the higher operating pressures associated with R-410A refrigerants

Dead-End Lock-up: Ensures zero downstream flow and prevents pressure spikes when appliances are not firing

or debris such as insects getting stuck in the armature

making it compatible with most major BAS controllers that require a 10K-AN thermistor

Honeywell 420-I Converter 320819-301 or a failure to openThe Honeywell 420 I Converter is a professional grade Modbus RS 485 to 4 20mA digital to analog output converter designed for seamless integration into complex Building Automation Systems (BAS). This module bridges the communication gap between serial Modbus RTU networks and traditional analog field devices, providing a reliable analog output signal for proportional control. Engineered for precise signal conversion, the 420 I supports up to 127