Resideo AT72D1089 Transformer R-407C maintaining the correct water column

maintaining the correct water column pressure switch rating is essential for system reliability and preventing nuisance lockout codes related to pressure switch monitoring circuits

Using this unit with water may lead to internal corrosion and failure

you can increase or decrease the pitch diameter to meet exact system static pressure requirements

This model utilizes a 5/8" ODF inlet and a 1-1/8" ODF outlet

Resideo AT72D1089 Transformer R-407C maintaining the correct water columnThe Resideo AT72D1089 Transformer is a professional grade solution for technicians requiring a reliable 120V to 24V step down for HVAC control circuits. Engineered with a 40VA power rating, this unit is built to manage the electrical load of 24VAC thermostats, gas valves, and multi zone relays. The hardware features a 4"x4" plate mount design and a NEMA Type D enclosure, ensuring compliance with NEC Class 2 (not wet) and Class 3 (wet) requirements.