The "BATT LOW" indicator signifies that the internal CR2 lithium battery needs replacement

Durable Construction: Built to endure the diverse applications found in modern HVAC limit controls

It features a reliable 3-20 PSIG operating range with a factory-calibrated 12 PSIG cut-in (R to Y) and a fixed 2 PSI switch differential

draft inducer

As a critical component in safeguarding the compressor and expansion valves

Carrier HH680354 Limit Switch 322838-752 The "BATT LOW" indicator signifiesThe Carrier HH680354 Limit Switch is a critical safety component designed for high temperature monitoring in Carrier, Bryant, and Payne furnaces. This disc style, normally closed circuit is engineered to open when the internal plenum temperature reaches 250F, effectively breaking the electrical circuit to the gas valve to prevent heat exchanger damage or unsafe operating conditions. Once the temperature cools by the 20F differentialdropping to