Carrier HH19ZA150 Limit Switch 320819-301 setting the pressure differential set

setting the pressure differential set point is straightforward—no need to remove the cover during routine maintenance

the mechanical assembly is compromised and requires immediate replacement

It was factory calibrated with a 24 VDC supply and a 250-ohm load for optimal performance

Regular preventative maintenance should include wiping the cell surface to ensure a clear line of sight to the flame

06-inch internal diameter (0

Carrier HH19ZA150 Limit Switch 320819-301 setting the pressure differential setThe Carrier HH19ZA150 Limit Switch is a critical OEM safety control designed to monitor discharge air and heat exchanger temperatures in Carrier, Bryant, and Payne furnaces and air handlers. This auto reset high limit switch is engineered with a pre set trip point that opens at 150F to interrupt the burner circuit or blower motor, preventing hazardous overheating. Once the internal temperature closes at 110F during the cooling cycle, the switch