This is a normally closed (NC) disc-type switch specifically calibrated as a 190°F main limit switch with a 20°F differential

Reinforced with an integrated spring to ensure reliable airflow and prevent signal-dampening kinks

This identifies the specific negative pressure threshold required to close the internal switch contacts

Optimal Torque Delivery: Corrects low-voltage starting issues by delivering the precise 189-227 µF capacitance required for heavy-duty compressors

Safe Operation: Acts as a failsafe mechanism to shut down the system if exhaust gases are not properly drafted

Honeywell 24001661-601 Chart Paper Els PW 17895 This is a normally closedMaintain precise data logging and regulatory compliance with the Honeywell 24001661 601 Chart Paper. This 100 count circular chart paper is engineered for high accuracy recording in rigorous industrial environments, including HVACR monitoring, food processing, and heat treatment facilities. Designed specifically for the Honeywell DR4200, DR4300, and AR100 recorder series, this paper features a 10. 31 inch diameter with a calibrated scale of 0 to 100.