The hot surface igniter will glow red hot.

There is a slight delay allowing the hot surface igniter to reach temperature.

As soon as the control board verifies all safeties are good and the pressure switch is closed, it engages the hot surface igniter by energizing it with voltage.

On a call for heat from the thermostat, the inducer motor engages.

This simplifies the process and eliminates a pilot like the Smart Valve described above. Direct Ignition Sequence for Hot Surface IgnitionĪ majority of hot surface ignition systems light the main burners directly. Therefore, everything is done through the gas valve from providing the ignition source to the flame rectification process. Then the pilot lights the main burners after the board verifies the pilot is lit. This type of hot surface ignition differs from a typical hot surface ignition system by lighting a pilot light first. Additionally, Honeywell makes, what they call, a Smart Valve. There are some manufacturers the make 230-volt hot surface igniters.

First, most hot surface igniters operate off of 120-volts. There are different types of hot surface ignition. Ignition Types and Methods | How Hot Surface Ignition Works Pilot Ignition The microamps pass through the flame sensor and are detected in the ignition control board. What is flame rectification? Flame rectification uses a flame sensor to detect a minimal amount of amperage generated by the flame.

For flame verification, we will use flame rectification. That the hot surface igniter did its job and lit the gas into a flame. There must be a method of verifying the flame. Therefore hot surface ignition ensures we will light the gas. When voltage is applied to a hot surface igniter, the temperature exceeds 2000° F.

For natural gas or propane, that temperature is over 1200☏. In the safety requirements for any method or design, we need to consider the following:įor this requirement, we need to make sure we provide an igniter that will give a temperature above the ignition temperature of the gas. How Hot Surface Ignition Works | Safety FirstĪny tas furnace ignition system needs to be safe. We will describe the different types of hot surface ignition, including the gas furnace sequence of operation for different types of hot surface ignition.

Therefore we decided to write an article on it so you can understand how hot surface ignition works. You may be wondering how hot surface ignition works? It is used in many different types of gas furnaces in use today. How Hot Surface Ignition Works - Hot surface ignition is a method of lighting a gas furnace.

Hot tube ignition system