As a homeowner or technician, understanding the wiring diagram of an Armstrong furnace control board is essential. This diagram shows how the various components of the control board are interconnected, allowing you to diagnose and fix any problems that may arise. In this article, we will explain the different parts of the Armstrong furnace control board wiring diagram, their functions, and how you can troubleshoot them if necessary.
The Components of the Armstrong Furnace Control Board
The Armstrong furnace control board has several components that work together to ensure the proper functioning of the furnace. These components include:
| Component | Function |
|---|---|
| Transformer | Converts high voltage AC power to low voltage AC power. |
| Relay | Controls the flow of electricity to various components of the furnace. |
| Control Board | Regulates the operation of the furnace by receiving input from the thermostat and other sensors. |
| Limit Switches | Prevents the furnace from overheating by shutting off the power when the temperature exceeds a certain point. |
| Ignition Control Module | Controls the ignition process for the furnace. |
The Transformer
The transformer is the component that converts high voltage AC power to low voltage AC power. This low voltage power is what the control board and other components of the furnace use to operate. The transformer receives its power from the main electrical supply and reduces it to a lower voltage, typically around 24 volts.
If the transformer fails, the control board and other components will not receive power, and the furnace will not operate. A multimeter can be used to test the transformer’s output and determine if it is functioning correctly.
The Relay
The relay is an electromagnetic switch that controls the flow of electricity to various components of the furnace. When the control board sends a signal to turn on the blower motor, for example, the relay closes to allow power to flow to the motor. When the control board signals for the motor to stop, the relay opens to cut off power.
If the relay fails, the furnace may not operate or may operate intermittently. A multimeter can be used to test the relay’s continuity and determine if it is functioning correctly.
The Control Board
The control board is the brain of the furnace, regulating its operation based on input from the thermostat and other sensors. It receives signals from these components and sends signals to other components, such as the blower motor and gas valve, to control their operation.
If the control board fails, the furnace will not operate. A multimeter can be used to test the control board’s input and output signals and determine if it is functioning correctly.
The Limit Switches
The limit switches are safety devices that prevent the furnace from overheating by shutting off power when the temperature inside the furnace exceeds a certain point. These switches are typically located near the heat exchanger and are activated when the temperature reaches a predetermined level.
If a limit switch fails, the furnace may shut off prematurely or not reach the desired temperature. A multimeter can be used to test the switch’s continuity and determine if it is functioning correctly.
The Ignition Control Module
The ignition control module is responsible for controlling the ignition process for the furnace. It receives input signals from the control board and sends signals to the gas valve and igniter to initiate the ignition sequence.
If the ignition control module fails, the furnace will not ignite. A multimeter can be used to test the module’s input and output signals and determine if it is functioning correctly.
FAQ
What is an Armstrong furnace control board wiring diagram?
An Armstrong furnace control board wiring diagram is a schematic diagram that shows how the various components of the control board are interconnected. It allows you to troubleshoot problems with the furnace and understand how it works.
Why is it important to understand the Armstrong furnace control board wiring diagram?
Understanding the Armstrong furnace control board wiring diagram is important because it allows you to diagnose and fix problems with the furnace. It also helps you understand how the furnace operates and how to maintain it properly.
What are some common problems with the Armstrong furnace control board?
Common problems with the Armstrong furnace control board include faulty transformers, relays, and control boards, as well as malfunctioning limit switches and ignition control modules. These components can be tested with a multimeter to determine if they are functioning properly.
Can I replace the Armstrong furnace control board myself?
Replacing the Armstrong furnace control board can be a complex task, and it may be best to consult a professional HVAC technician. However, if you have experience with electrical work and are comfortable working with high voltage systems, you may be able to replace the board yourself.
How often should I replace the Armstrong furnace control board?
The Armstrong furnace control board should be replaced only when it fails or is determined to be faulty. With regular maintenance and proper use, the control board should last for many years.
