including the 21TC and AUC series

the RS9220 is compatible with gas

The Belimo BF120-2 is a robust fire and smoke damper actuator designed for critical safety applications in HVAC systems

000 BTU units (PDP/BDP 300)

preventing the control board from sending voltage to the gas valve

Carrier HH18HA498 Limit Switch 319825-402 including the 21TC and AUCThe Carrier HH18HA498 Limit Switch is a high precision OEM furnace limit control engineered for critical thermal regulation in Carrier, Bryant, and Payne heating systems. This disc style limit switch functions as a primary safety mechanism, featuring a normally closed circuit that opens on temperature rise to prevent heat exchanger damage or hazardous operating conditions. With a factory calibrated operating range of 170 210F, the switch is designed