Carrier KAACH1201AAA Belt 321042-401 Integrated Safety: Serves as a

Integrated Safety: Serves as a primary safety line to shut down the gas valve if heat exchanger temperatures exceed safe operational limits

Common indicators include the furnace failing to initiate the igniter warm-up period

This board is specifically designed for systems requiring a C2-3 control architecture

As a Carrier replacement relay board

while the factory-installed vent limiters enable indoor installation without the need for additional piping to the outdoors

Carrier KAACH1201AAA Belt 321042-401 Integrated Safety: Serves as aThe Carrier KAACH1201AAA Crankcase Heater is a critical electric resistance heater designed for HVAC compressor protection in residential air conditioning and commercial refrigeration systems. Operating at 240 Volts with a 40 Watts output, this belt type heater effectively maintains lubricant temperature during the compressor's off cycles. By keeping the crankcase oil warm, it prevents refrigerant migration and minimizes the risk of liquid slugging