This immersion temperature controller is essential for contractors requiring an L4006A equivalent for high-limit protection in commercial or residential boiler applications

providing precise burner alignment

Direct Fit Compatibility: Standard 3/8" x 1/2" connections ensure a straightforward HVAC installation process for technicians

Optimized Heat Transfer: The 40W output is calibrated specifically for 480V circuits to provide consistent thermal energy without overheating the sump

The unit includes an integrated manual shut-off

Lennox 21708 Blower Wheel 321894-708 This immersion temperature controller isThe Lennox 21708 Blower Wheel is a high precision OEM replacement part engineered for demanding air distribution in residential and light commercial HVAC units. Featuring a 10 x 8 1 2 inch configuration and a 1 2 inch bore, this direct drive blower wheel is built to maintain tight tolerances and static pressure requirements in Lennox furnaces and air handlers. With 48 precisely pitched blades, this CW rotation blower wheel (clockwise from the hub end)