this heater fan relay provides the essential electrical switching required to manage 1400 RPM fan speeds and heat pump sequences

more controlled ignition by gradually increasing the gas flow

though specific field wiring adjustments for the transformer and EAC connections are necessary for older standing pilot configurations to ensure proper 24V/115V isolation

this part is critical for connecting the sight glass oil equalizer lines

Trane THT2855 Limit Switch 320819-301 this heater fan relay providesThe Trane THT2855 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial HVAC systems. This fixed temperature limit control is engineered to interrupt the electrical circuit when internal plenum temperatures exceed safety thresholds, preventing heat exchanger damage and potential fire hazards. This specific manually operated safety switch features a cut out temperature of 145F and a cut