Johnson Controls A28AJ-4 Temperature Control R-410A Engineered for unit heaters and

Engineered for unit heaters and duct furnaces

it offers significant current-limiting capabilities

Direct Replacement: Simplifies maintenance by serving as the standard replacement for the TS394-3B-72Q sensor

BAS Integration: Native RS-485 Modbus RTU support ensures easy field communication with existing building controllers

Johnson Controls A28AJ-4 Temperature Control R-410A Engineered for unit heaters andTemperature Control, Two Stage, 2 SPDT Switch Action, 120 208 240 277 Vac, 20 80 Degree Setpoint Range, 2 Degree Differential Each Stage and 2 7 Degree Differential Between Stages, 3 8" x 5" Sensing Bulb, 6' Capillary Length, Knob Range Adjuster