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

Multi-Fuel Versatility: Certified for use with multiple fuel types

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

consult our team for a dedicated ZF or low-temp reciprocating model

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

Carrier HH18HV135 Limit Switch 321702-401 the two-way configuration supports proportionalThe 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