Lennox 87H90 Limit Switch Always verify your regulator model

Always verify your regulator model number before installation

How do I test the Fenwal 05-100000-426 for proper operation

Always verify the valve series on the nameplate before installation

as well as several legacy commercial enclosures

Enhanced System Safety: Proper sequencing prevents heat exchanger overheating by ensuring the fan remains active during the cool-down cycle

Lennox 87H90 Limit Switch Always verify your regulator modelThe Lennox 87H90 Limit Switch is a critical OEM furnace replacement part engineered for precise thermal regulation within high performance heating systems. This primary limit control features a 1. 75 inch insertion length and operates on an automatic reset logic, making it essential for maintaining safe internal plenum temperatures. As a veteran technician knows, this SPST (Single Pole Single Throw) safety device is designed to open on rise at 190F