Chicago Dryer Hi-Limit Temperature Control Module, Type K – 4206-520

The 4206-520 Hi-Limit Type K is an electronic high-limit temperature control module designed for use in Chicago Dryer commercial laundry dryers. Unlike mechanical snap-disc thermostats, this Type K hi-limit uses an electronic temperature-sensing circuit and onboard relay to provide precise, repeatable over-temperature protection.

The module continuously monitors operating temperature and interrupts the heat circuit when unsafe limits are exceeded, protecting burners, airflow components, and the dryer cabinet from heat damage. Board-mounted components—including a transformer, relay, and calibration circuitry—allow for stable performance under continuous-duty, high-heat laundry conditions. This hi-limit module is typically used in advanced dryer control systems where tighter temperature control and reliable safety response are required.

Ideal for corrective replacement or preventive maintenance, the Type K hi-limit restores proper safety shutdown functionality and helps reduce nuisance trips caused by drift-prone mechanical limits.

Maintenance Tip: Repeated hi-limit trips usually indicate airflow restrictions, lint buildup, or exhaust issues. Always correct root causes before replacing the control. Trusted by laundry engineers for decades.