The heat sequencer relay provides a reliable "on" timing of 10-30 seconds and an "off" delay of 30-60 seconds across all three poles

allowing a technician to reset the radiator valve lock mechanism for seasonal adjustments or system re-balancing

ensure the actuator is installed in a horizontal position to prevent heat damage from the pipe

selecting the correct Sensus 243-12-2 or 243-8-2 orifice size is essential to prevent hunting and ensure stable downstream pressure

Technicians should check for continuity across the terminals when the coil temperature is below the switch's closing setpoint

York S1-025-43269-000 Control 319847-401 The heat sequencer relay providesThe York S1 025 43269 000 Control is a high limit temperature control switch designed for precision thermal monitoring in York, Luxaire, and Coleman HVAC systems. Engineered for reliability in high heat environments, this limit switch features a fixed 245F open and 215F close setting, providing essential overheat protection to prevent heat exchanger damage or unsafe operating conditions. As an OEM York replacement part, it ensures direct compatibility