Resideo AT72D1188 Transformer 321702-401 check for a clogged inlet

check for a clogged inlet screen or internal mechanical failure before replacing the component

this high-pressure cut-out is rated for high-pressure refrigerants typical in modern commercial Trane equipment

A flashing green LED typically indicates a problem external to the module

this valve is factory set at 30 PSI to meet specific safety standards

Ensure the flow arrow on the brass valve body aligns with the direction of the system fluid to prevent back-pressure issues and ensure a proper seal

Resideo AT72D1188 Transformer 321702-401 check for a clogged inletThe Resideo AT72D1188 Transformer is a heavy duty, plate mounted solution designed for consistent step down power in 24V control circuits. This 40VA HVAC transformer features a 120V primary input and a 24V secondary output, making it a standard choice for technicians servicing thermostats, gas valves, and relays. Engineered for industrial grade durability, it includes a NEMA Type D rating and a 4"x4" mounting plate designed to secure onto a junction