This L170-40F limit control is a precision-engineered OEM replacement part designed to monitor discharge air temperatures and prevent heat exchanger damage

it is a standard requirement for maintaining the 82% AFUE and high-thermal-efficiency ratings of the Lochinvar Knight and Copper-Fin series

Why does this thermocouple include a junction block

making it less prone to cracking during handling or thermal shock

Lennox 29K14 Condensate Trap Els PW 17895 This L170-40F limit control isThe Lennox 29K14 Condensate Trap is a critical factory specified OEM component engineered for high efficiency residential and light commercial HVAC systems. Designed for a precise fit in modulating condensing furnaces and secondary heat exchanger assemblies, this part ensures the proper management of moisture generated during the heating and cooling cycles. The Lennox 29K14 creates a vital water seal that prevents the infiltration of combustion gases