Resideo AT40A1139 Transformer 321142-301 Technicians frequently spec this model

Technicians frequently spec this model for its tee handle gas valve configuration

Key Benefits Serviceability: Powerhead and motor can be replaced without disassembling the valve body or draining the hydronic system

Whether you are performing a Resideo DP3040B5002 replacement or a new system build

Most failures are secondary to a downstream short circuit

5-inch stainless steel probe and includes a 300 series stainless steel thermowell

Resideo AT40A1139 Transformer 321142-301 Technicians frequently spec this modelThe Resideo AT40A1139 Transformer is a heavy duty 40VA power supply designed for reliable 24V control circuits in residential and light commercial HVACR applications. Engineered with a 240V primary and a 26. 5V secondary output, this NEMA Type D transformer ensures consistent voltage regulation for thermostats, zone valves, and gas valves. The channel frame mounting configuration allows for versatile installation directly onto a junction box or