Repeated tripping of the rollout limit switch usually indicates a heat exchanger failure

and unit heaters

which are common symptoms of an incorrectly sized or worn orifice

Maintaining the correct exhaust temperature limit is essential for preventing element failure and ensuring compliance with safety standards

the positioner spring is the primary component used to adjust and set the starting point and operating span of the pneumatic actuator relative to the control signal

White-Rodgers 90-290Q Relay Repeated tripping of the rolloutThe White Rodgers 90 290Q Relay is a heavy duty, 24V single pole normally open (SPNO) switching solution designed for high reliability in HVACR control circuits. As a veteran preferred fan relay, this unit features a Type 84 enclosed design, making it an ideal choice for managing single or two speed fan motors, solenoids, and resistive loads. With a contact rating of 8 Amps inductive and 16 Amps resistive at 125 250 VAC, the 90 290Q provides