Laars Heating Systems RE2217700 Limit L99H008 Johnson Controls T-4000-110 Aspirator Wallbox

Johnson Controls T-4000-110 Aspirator Wallbox Kit for Concealed Mounted Thermostats without Push Buttons

always verify your existing wiring diagram against the terminal layout

For technicians performing a Rheem AC expansion valve replacement

Maintains performance across a broad operating temperature range

it is often due to the switch failing to close at 30°F

Laars Heating Systems RE2217700 Limit L99H008 Johnson Controls T-4000-110 Aspirator WallboxThe Laars RE2217700 High Limit Switch is a critical safety component designed for precise thermal regulation in hydronic heating systems. Engineered for high temperature protection, this automatic reset limit triggers at 200 Fahrenheit, breaking the electrical circuit to prevent heat exchanger damage or unsafe operating conditions. As a direct OEM Laars replacement part, it ensures proper calibration and fitment for compatibility with Laars Mighty