This kit is specifically designed for use with the Honeywell TP970 Series and TP9600 series thermostats

the two-way configuration supports proportional control to ensure precise temperature regulation and system efficiency

the hardware configurations differ between the 10-inch DR4200 and 12-inch DR4500 series

This specific model is optimized for 24VAC systems commonly found in North American HVAC equipment

The Carrier HC51TE460 Fan Motor is a high-performance

Carrier HH18HV135 Limit Switch 321702-401 This kit is specifically designedThe Carrier HH18HV135 Limit Switch is a critical OEM replacement part designed for high limit thermal protection in residential and commercial HVAC systems. This disc style sensor features a normally closed (NC) configuration that triggers an open circuit at 135F to prevent heat exchanger damage or unsafe operating conditions. Once the temperature drops to 110F, the automatic reset capability restores the circuit, ensuring continuous system operation