Resideo l4064b2236/u Fan and Limit Control 8 Inch

Product Description

The RESIDEO l4064b2236/u is a fan and limit control designed for residential and commercial heating systems, primarily gas and oil-fired forced-air furnaces. It serves two core functions: it energizes the blower motor once supply air reaches a set temperature, and it shuts down the burner if supply-air temperature exceeds a safe upper limit. The 8-inch insertion depth allows the sensing element to reach the airstream inside a standard furnace heat exchanger plenum. Licensed HVAC technicians and heating contractors install this control as an original-equipment replacement or upgrade on a wide range of forced-air systems.

This control is intended for use in forced-air gas and oil furnaces found in both residential and light commercial applications. The universal mounting configuration simplifies retrofits and replacements across many furnace cabinet styles. The 8-inch insertion surface suits standard-depth plenums and heat exchanger sections where accurate air-temperature sensing is required for reliable fan cycling and over-temperature protection.

Key Features

• Dual-function control: manages fan-on and fan-off setpoints and provides high-limit burner shutoff
• 8-inch insertion sensing element for accurate plenum air-temperature monitoring
• Universal surface-mount design simplifies installation and retrofits
• Automatic high-limit shutoff protects heat exchanger from over-temperature conditions
• Suitable for both residential and light commercial forced-air heating equipment

Compatibility

Designed as an OEM-style replacement fan and limit control for residential and light commercial forced-air gas and oil furnaces requiring an 8-inch insertion-type sensing element with universal surface mounting.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with applicable local codes and the furnace manufacturer's service documentation. Shut off electrical power and close the gas or fuel supply before removing the existing control or making any wiring connections. The sensing element must be inserted fully into the plenum to the specified depth before securing the mounting plate. Verify all fan-on, fan-off, and limit settings against the furnace manufacturer's specifications before returning the system to service.

Technical Specifications

• Insertion Depth: 8 inches
• Mount Type: Universal Surface Mount
• Function: Fan and Limit Control
• Application: Forced-Air Furnace (Gas or Oil)

Standard Information

• Brand: RESIDEO
• Manufacturer Part Number: l4064b2236/u