Electronic Control Board for an Electronic Ignition Gas Furnace
Electronic ignition for gas furnaces is the modern way for furnaces to light the main burners on modern gas furnaces. Electronic ignition gas furnace technology has evolved from the standing pilot gas furnace ignition systems that continue to be used today however there are less and less standing pilot gas furnaces used today. If your furnace is not working and you want to troubleshoot an electronic ignition gas furnace system it is important to make sure you know which type of ignition system you have for your furnace. Additionally there are different types of electronic ignition gas furnace systems and it is important to differentiate between the types of electronic ignition systems before troubleshooting a gas furnace electronic ignition. We will break it all down for you in this series article: “Troubleshooting an Electronic Ignition Gas Furnace“.
Oil burner oil filters are important to keep trash out of the burner gun and plugging the nozzle. A dirty filter can also choke the system from firing properly by preventing the correct amount of oil flow from reaching the nozzle. Oil furnace oil filters or oil boiler oil filters should be changed on at least an annual basis. More if the oil or oil tank is of poor quality. It is also recommended that the oil furnace or oil boiler be shut down when oil delivery is made. As the oil is pumped into the tank it stirs up trash in the bottom of the tank. If the furnace or boiler is running this trash is sucked into the oil line and goes straight to the filter where it can plug the filter. Continue reading “Furnace and Boiler Oil Filters” »
My furnace is leaking water and it is summer time so I am not using it for heat except for the blower fan which is hooked up for the air conditioner and the heat. I know the pipes from the outside units run into a box on top of the furnace so I think that is a part of the air conditioner. What can I do to fix the problem if you know what the problem is by my explanation here?
Gas Furnace with Hot Surface Ignition – Burner Compartment
Whenever we talk about electronic ignition systems we must first look at the key components which make these systems work and understand how they work. Hot surface ignition systems work in various ways depending on what the electronic ignition manufacturer and design engineer determined in the design. Some are direct main burner ignition while others light a pilot and the pilot lights the main burners. A vast majority of hot surface ignition systems light the main burners directly without using a pilot light. This is a simpler form of using a hot surface igniter to light a pilot light and then have the pilot light the main burner. There are fewer parts to worry about and therefore less mechanical things which can break down or go wrong to worry about in a direct main burner ignition system.
The oil burner and oil controls provides the main source of heat for this oil furnace. The oil burner comprises of an oil pump, a burner electric motor, a burner blower, a step-up transformer, an oil ignition control, an oil burner gun and oil nozzle(inside not viewable here). The burner electric motor is directly linked to the blower and the oil pump and when the electric motor starts (controlled by the ignition control) the pump begins pumping oil while the blower provides primary air to the combustion chamber.
Gas furnaces, boilers, and water heaters have evolved from the basic standing pilot ignition system to the state of the art electronic ignition models. Standing pilot gas furnaces relied on keeping a pilot flame lit for the furnace, boiler, or water heater to function. The advent of electronic ignition has made it possible to prove a flame without keeping a pilot light lit 24/7 and thereby saving money because electronic ignition only needs to have a flame when there is a call for heat from the thermostat. There are different types of electronic ignition gas furnaces.
Gas furnaces are a very popular form of heat for homes and businesses and occasionally a gas furnace needs to be repaired because of a problem with the gas furnace. Since there are many different types of gas furnaces it is difficult to cover every single possible gas furnace problem that can occur with a gas furnace in one article we are going to break this theme “gas furnace problems” down into series of articles with the first one being gas furnace problems with electronic ignition gas furnaces. There are different levels of problems that can occur with any gas furnace and the first level of failure is an electronic ignition failure which is quite common with gas furnaces and knowing how to troubleshoot a furnace problem is key to solving the problem. Another level of failure is a failure with electrical systems on a gas furnace and both of those failures can be one in the same. That is an electronic ignition failure can be the result of an electrical failure in the system somewhere. And when I say electrical failure with a gas furnace problem I am speaking of controls or control wiring with the gas furnace. To break it all down we will begin with the sequence of operation with a gas furnace which is very important to understand if we are to fix troubleshoot the electronic ignition gas furnace problem.
Standing pilot gas furnaces and water heaters are still around today even in newer homes. All the major hardware stores and HVAC dealers carry standing pilot appliances although a new standing pilot gas furnace or boiler are rare finds these days because of the move to higher efficiency models and the wide use of electronic ignition technology which improves efficiency. Before you proceed you’ll want to determine if you actually have a standing pilot system in you HVAC furnace, boiler, or water heater. In many cases on many appliances there are basic instructions on lighting the pilot light if in fact you do have a standing pilot system. Check around the main panel or look at the gas valve itself. Sometimes, especially on older appliances, there are no instructions on lighting a pilot light if the pilot light goes out on a standing pilot gas furnace, boiler, or water heater. The label or sticker on the furnace, boiler, or water heater faded a long time ago and you will need to follow the instructions in this article.
This Oil Furnace has flue gas condensation problems as one can see from the white residue forming on the front of this oil furnace. This problem occurs when the flue gases are not hot enough to rise above and out of the flue. The flue gases from the oil furnace are condensing and the residue which is highly caustic is dripping back down the flue and around the furnace. The cause of this problem is likely because the oil settings are not correct. The oil burner is providing either too much air to the combustion chamber or too little air to the combustion chamber and either of these can cause the flame temperature to be too low and lack the heat necessary to carry the flue gases out and away from the flue. An adjustment can be made using a combustion analyzer to ensure the proper amount of air is introduced into the combustion chamber to ensure the correct combustion process. Using a combustion analyzer one can also test the amount of O2, CO2 and CO along with other factors that make the combustion process efficient and safe. The caustic properties for the flue gas condensationwill likely cause the furnace and the flue to rot prematurely.
This Honeywell oil burner ignition control controls the oil burner sequence of operation. On a call for heat from the thermostat the oil burner ignition control starts the burner blower. this mechanically interlinked with the oil pump. The blower blows air into the combustion chamber and the oil pump pumps oil to the burners oil nozzle. The step up transformer is energized and applies a very high voltage spark to the burners ignitor. When the flame is detected it is immediately detected by a cad cell eye which recognizes the light produced by the flame inside the combustion chamber. After the cad cell eye detects the light from the flame it signals the oil burner ignition control that all is well and to keep things going. The oil burner will continue to produce a flame until either the cad cell eye determines there is no flame or the thermostat satisfies and stops the call for heat. If its the thermostat stopping the call for heat the oil burner ignition control stops the blower and the fire in the combustion chamber goes out. The blower in the furnace, which blows air through the ductwork and delivers it to the vents in the home, continues to run. This makes use of the residual heat left over inside the heat exchanger and allows things to cool off. The fan on an oil furnace usually shuts off based on temperature. When the temperature inside the heat exchanger cools down to a certain setpoint it shuts off the blower.