Williams Wall Furnace Parts Diagram: A Comprehensive Guide

WILLIAMS WALL FURNACE Parts Model 400DVXR Sears PartsDirect
WILLIAMS WALL FURNACE Parts Model 400DVXR Sears PartsDirect from www.searspartsdirect.com


When it comes to heating your home, Williams wall furnaces have been a popular choice for many homeowners. These efficient and reliable heating systems provide warmth and comfort during the colder months. However, like any other appliance, they may require regular maintenance or parts replacement over time. In this article, we will provide you with a detailed diagram of Williams wall furnace parts, ensuring that you have a clear understanding of how your heating system works.

Understanding the Williams Wall Furnace

Before diving into the parts diagram, it’s essential to have a basic understanding of how the Williams wall furnace operates. These gas-powered heating systems are designed to be mounted on the wall and provide direct heat to the room. They use natural gas or propane as a fuel source and typically require a venting system to expel combustion gases safely.

The Main Components

The main components of a Williams wall furnace include the burner assembly, heat exchanger, blower motor, control board, and thermostat. Each of these parts plays a crucial role in ensuring that your heating system operates efficiently and effectively.

Burner Assembly

The burner assembly is responsible for igniting the fuel and producing a flame. It consists of a gas valve, pilot orifice, main burner orifice, and an ignition system. When the thermostat signals a need for heat, the gas valve opens, allowing gas to flow through the orifices. The ignition system then sparks, lighting the gas and creating a flame.

Heat Exchanger

The heat exchanger is a vital part of the Williams wall furnace as it transfers heat from the burner assembly to the surrounding air. It is typically made of steel and has a series of tubes or coils that allow the hot combustion gases to pass through. As the gases pass through the heat exchanger, they release heat, which is then blown into the room by the blower motor.

Blower Motor

The blower motor is responsible for circulating the heated air throughout the room. It consists of a motor and a fan that pushes the air through the heat exchanger and into the ductwork. The blower motor is controlled by the control board, which receives signals from the thermostat to adjust the fan speed and temperature settings.

Control Board

The control board acts as the brain of the Williams wall furnace. It receives input from the thermostat and various sensors to control the operation of the heating system. It regulates the gas valve, ignition system, and blower motor to maintain the desired temperature in the room.


The thermostat is the interface between you and your Williams wall furnace. It allows you to set the desired temperature and control the operation of the heating system. When the temperature drops below the set point, the thermostat signals the control board to activate the furnace, starting the heating cycle.


Understanding the various parts of your Williams wall furnace is essential for troubleshooting and maintenance purposes. By having a clear diagram of the components, you can identify any faulty parts and replace them as needed. Regular maintenance and timely repairs will ensure that your Williams wall furnace continues to provide efficient and reliable heating for years to come.