If your repair technician just gave you the bad news that your furnace has a cracked heat exchanger, and you said, a cracked what. If a properly conducted heat exchanger test shows a cracked heat exchanger, the repair person is to red tag and shut off the furnace as this will result in death of occupants. There are only two options if a heat exchanger is bad. At its outset, a cracked heat exchanger is a problem that will go unnoticed by most homeowners. Affordable and search from millions of royalty free images, photos and vectors. As air is circulated through the hvac system, it passes over the heat exchanger and absorbs thermal energy. These next two photos show the cracks from the exterior, or blower side of the heat exchanger cell. I show how a furnace reacts when there is a crack in the heat exchanger. In some rare cases, it can cause flame impingement when air from the blower enters the heat exchanger. The concern is that a cracked heat exchanger could allow exhaust gas from the furnace to contaminate the household air with carbon monoxide.
This part of the heat exchanger is usually not visible during the course of a home inspection. May 12, 2000 miss a cracked heat exchanger and you put the homeowners at risk. The heat exchanger contains the gas combustion chamber. A gas furnace s heat exchanger is another potential source of leaked carbon monoxide. A warning about cracked heat exchangers in gas furnace. It was better than nothing, but it was still only slightly better than flipping a coin. A furnace heat exchanger works by literally exchanging or transferring the heat created in the combustion chamber to the exterior of the unit, where it is then blown through the ductwork throughout the house. How do i clean the heat exchanger on a model cmf100po furnace which runs with a wayne oil boiler.
When a furnace has a cracked heat exchanger, can it be. Diagnosis of a heat exchanger crack typically starts with a noheat service call. A furnace with a cracked heatexchanger is usually an exception, because of the cost of the repair. A furnace with a cracked heat exchanger will definitely produce carbon monoxide and poses an immediate. Avoid these 4 common furnace repair scams oconomowoc boiler. The dangers of a cracked heat exchanger help heating. Find highquality stock photos that you wont find anywhere else. The moisture in burned gas is slightly acidicabout the same level as a tomatoand this acid will corrode a heat exchanger over time. These cracks often appear along the heat exchangers seams. It is a system which controls the primary climate inside your house or home enabling you to stay comfortable and healthy.
Dec 29, 20 is raleigh, durham, chapel hill, garner, apex, holly springs, and wake forest premier plumbing heating and air conditioning contractor. One of the most common reasons a gas furnace can be taken out of service, is when the repair technician finds to a cracked heat exchanger. The cause of the failure has been analyzed, and the. A combustion analyzer gives us co and oxygen readings. Nov 15, 2016 the heat exchanger is the most important part of your heating and cooling system, allowing heat to transfer between mediums to keep your home at the optimal temperature. They can come inspect your furnace and determine if you do indeed have a cracked heat exchanger. The heat exchanger is a key part of the furnace and is responsible for the actual heating of air. The author has been in the industry for years as a trainer for hvac technicians.
The cracked heat exchanger because the metal of the heat exchanger expands and then contracts as it heats and cools, the stress may eventually cause a crack to form on the exchanger. In some cases, a solid wall may separate the fluids and prevent them from mixing. Its not unlike a doctor telling you about the c word. When a furnace cannot get enough airflow, the heat exchanger overheats and suffers excess stress from expansion and contraction. When a heat exchanger becomes damaged and the combustion fumes and gases. We use it to check co levels given in parts per million, or ppm and determine for sure whether theres a crack in your heat exchanger. After the heat exchanger is hot, the air around the exchanger is warmed. Back in the day, the only way to check a heat exchanger for cracks was to perform a visual inspection. A heat exchanger is a specialized device that assists in the transfer of heat from one fluid to the other. Either the heat exchanger or furnace must be replaced your options if the heat exchanger has cracked. Chloride stress corrosion cracking of tubes of cleaned pellet convey. Not only is furnace performance an issue, but heat exchanger malfunctions can pose serious health and fire risks. It can also be the most dangerous, if something goes wrong with it. The most common cause of an overheated heat exchanger is a simple as a dirty air filter.
Pour a little bit of the chemical on the hole, and leave it to dry until it seals around the exchanger. What are the causes of a cracked heat exchanger in a gas. As a homeowner, getting the news that your heat exchanger is cracked is a bit of a harsh blow. Carbon monoxide and heat exchangers service experts. Heat exchanger cracks are a serious furnace repair issue. Heat exchanger cracks and carbon monoxide myths by reuben saltzman in carbon monoxide alarms, cracked heat exchanger, hvac, new on december 2, 2014 i recently had a reader email this question. Combustion pollutants, such as carbon monoxide, nitrogen dioxide and sulfur dioxide, can cause eye and nose irritation, disorientation, sleepiness and nausea. Prolonged exposure to carbon monoxide can be fatal. Now i am at the point where i can start to prepare the firebox for all of the repairing.
I recently had my ac checked out and the tech noticed and showed me that the heat exchanger had a couple cracks in it. I sent a short answer, but thought this was deserving of a longer answer in the form of a blog post. If the heat exchanger is under warranty, this is a good way to go. Lack of airflow also leads to much longer heating cycles, so not only is the heat exchanger hotter than it needs to be, it also has to endure the pain for a great time. With the heat exchanger removed, the crack should be obvious even to the untrained eye as in this picture. In furnaces, the heat exchanger is designed to direct combustion byproducts to the exhaust flue on one side and warm air into the house on the other.
The site of the crack should have a buildup as well, or there might be spots that are darker than the rest of the metal. There are older, traditional ways for finding cracked heat exchangers, such as smoke bomb methods, which contractors have relied on for years. Failed heat exchanger what you should know your furnaces heat exchanger is one of the most important aspects of your furnace. But the decision to repair or replace a heating unit can be difficult. One of the best ways you can protect your home from the dangers of a cracked heat exchanger is to know how those cracks develop in the first place. The reason a crack in a heat exchanger is such a cause for concernand reason to think about replacing a furnaceis because it creates a major health hazard. Have you heard this one recently, you have a cracked heat exchanger and your furnace has to be replaced, today. Proper diagnosis of a failed or cracked heat exchanger. If you have a cracked heat exchanger you should also be noticing more moisture in the house, with marked increase in moisture condensing on the cold surfaces like windows. This first photo shows the cracks as seen from inside.
He brought me down and showed me the cracks just inside the burners, i stuck my finger in there and felt them myself but now that i look at the burners again i see nothing. The service technician has the time, experience, or even reason to suspect the exchanger is cracked. Some cracks have been known to only open when the unit is fired and the heat exchanger metal is hot. The combustion analyzer also helps us gauge the overall performance of your furnace. If the heat exchanger develops cracks, the metal will get discolored with the soot that builds up on it.
How to avoid a premature breakdown of the heat exchanger. In furnaces, the heat exchanger is designed to direct. Cracked heat exchanger deciding to repair or replace. He also knew that the pressed rings where known to fall off and allow blower pressure into the heat exchanger on aging units. Danger of a furnace with a cracked heat exchanger servicemax. A cracked heat exchanger can be a likely cause for this. Bryant rtu cracked heat exchanger pictures youtube. Unless you are one of the top 3% of people who have all the money, replacing the furnace is going to hurt the pocket book if you have not planed for it, but it has to be done. In other designs, the fluids may be in direct contact with each other. Dec 02, 2014 i recently had a reader email this question. Will a cracked heat exchanger leak carbon monoxide. Furnace heatexchanger crack signs your furnace has one. The constant cooling and heating result in a crack to develop inside the exchanger.
Jun 11, 2011 pictures of the cracked heat exchanger on the bryant rtu, and the new one installed. Now at this point i have a better view of the cracks so here is the firebox with the heat exchanger removed. This video is part of the heating and cooling series of training. This air will then be distributed throughout the system. If a crack makes its way through the walls of your heat exchanger, dangerous carbon monoxide fumes can leak into your homes air. Combustion gases leaking from a cracked heat exchanger can cause frequent headaches as well as flulike symptoms. You can see the cracks for yourself below click on any of the photos for a larger version. Gas furnaces will last anywhere between ten to twenty years, during this lifetime heat exchangers will heat up and cool down thousands of times. The heat of the combustion gas raises the temperature of the metal, and as the air from the blower passes around it, heat transfers to it.
If the heat exchanger is cracked, the meter will show us. To determine if you have a cracked heat exchanger, an hvac contractor should. If theres a crack in this component, the gases being burned off, such as carbon monoxide, sulfur dioxide, and nitrous oxide, could leak into your home, causing illness or, in extreme cases, death. The heat exchanger should be properly inspected at regular intervals. The american gas association has even put this in writing they say any visible crack or hole is reason for requiring replacement of the heat exchanger or furnace. I open up the plenum and show the crack from the top. Where are the answered by a verified hvac technician. Find them too often, and your company could get a rep for using scare tactics. The dangers associated with a cracked heat exchanger inside the cabinet of your gaspowered furnace is a group a metal, clamshellshaped objects called heat exchangers. This trips a safety switch and shuts down the furnace.
Furnace with a cracked heat exchanger and flame rollout. The lennox whisper heat and g26 furnaces were two that were used as examples of furnaces that will most likely have heat exchanger leaks within 5 years of operation by the heat exchangers experts class i just took. This one is about a crack i found in a heat exchanger that caused no symptoms. Heres how to avoid premature furnace heat exchanger failure.
A cracked heat exchanger is not a problem that should be taken lightly. Find heat exchanger stock images in hd and millions of other royaltyfree stock photos, illustrations and vectors in the shutterstock collection. You can just have the heat exchanger replaced, but it is an expensive repair, and a new furnace is often the smarter investment. For residents of georgia, having an hvac, or heating, ventilation and air conditioning system, is imperative. A clogged air filter restricts airflow through the furnace, overheating the heat exchanger, and eventually resulting in stress cracks. The cause of cracked heat exchangers avoid this common scam. The problem with finding a crack in a furnace heat exchanger is that you can see very little of the heat exchanger without disassembling the furnace. Serious cracks were found at tubetotubesheet welds during the start up operation of a cracked gassteam heat exchanger in a gas plant.
We want to caution you about the most common cause for a gas furnace to become unsafe. He operned up a port and took a mirror to assess if there were any heat exchanger cracks as the plenum is narrow and i have a 110 input90 output btu unit for a house rated at 75 btu. In most cases, if the heat exchanger is cracked, your hvac company will recommend replacing the entire furnace. The heat exchanger is a metal container inside the furnace that collects hot combustion gas from the burners.
When a heat exchanger failsunder specific conditionsthe exhaust gases, including carbon monoxide, can mix with the air in the house. The major fault that develops with the heat exchanger is the development of a crack or hole inside. A cracked heat exchanger is one of the most serious issues that your furnace can develop. Basically, the heat exchanger is where the furnace heats the air. You know its serious and you know you need to do something about it. Im not going to say that every cracked heat exchanger is a life or death. This first photo shows the cracks as seen from inside the. In your opinion, does the first picture below left side of exchanger look like a. As air is circulated through the hvac system, it passes over the heat exchanger and absorbs thermal energy before its circulated throughout the house. If it is your heat exchanger, you cannot run your furnace, even if it. There are other possible culprits as well such as dirty burners. Can you repair a cracked heat exchanger on a gas furnace.
Corrosion because of reaction between the combustion gas and the metal often because of improper venting can also weaken the metal to the point where cracks form. Cracked heat exchangers usually occur in old furnaces. If it cracks after the warranty is up, usually at least 20 years, consider replacing the entire furnace. Beware of an unethical technician who finds a crack with a camera on a furnace that seems to be running just fine. Press this onto the furnace heat exchanger, and allow it to dry. A cracked heat exchanger is pretty serious, as far as safety for your home goes. Co is produced as a result of incomplete combustion.
Cracked heat exchanger deciding to repair or replace depending on the age of your furnace, a cracked heat exchange probably means you need a new system. However, if a crack develops in your units heat exchanger, then you might be looking at either an expensive repair or replacement. Please read this article about why heat exchanger cracks do not allow carbon monoxide into the house. Although unimpressive looking to untrained eyes, heat exchangers perform a vital part of the. Older furnaces can develop major issues, such as a cracked heat exchanger.
In order for this to happen, the furnace must be producing high levels of carbon monoxide and the exhaust gas must be mixing with the household air. A damaged heat exchanger in a gas furnace is potentially dangerous to a homes occupants and should not be ignored. I showed me what could be a crack hairline semicircle in one of the indented circles in the metal. Look for cracks or rust spots in the metal walls of the combustion chamber and heat exchanger, using a flashlight if necessary. How to determine if your furnace combustion chamber is cracked. Thousands of new, highquality pictures added every day. The cracks will allow that deposit through, making the heat exchanger appear sooty, as discussed in the section above. How do i clean the heat exchanger on a model cmf100po. Broken and leaking heat exchangers are responsible for about 1,500 deaths per year in the united states, and many more people are poisoned by exposure to toxic gasses that go unfiltered by defective heat exchangers. Located in the center of the furnace, it is where fire, gas and heat connect. If the heat exchanger is under warranty, this option is a good way to go unless it is unavailable in the time frame needed, which can be immediate in cold weather. He or she can use a combustion gas analyzer to determine if it is your heat exchanger or not.
Other than this, there really isnt anything else that can definitively give you an answer. A crack in your heat exchanger is no trivial matter. If your heat exchanger is most likely the issue, its time to call in a professional. Cracked heat exchangers can cause death heating and air.
Also, look for sooty discoloration, which might appear if combustion byproducts are passing through barely visible cracks. Nowadays, checking for a cracked heat exchanger is way more scientific. Mar 19, 2007 the crack is open when the heat exchanger metal is at or close to room temperature. In this article we discuss residential forced warm air furnace heat exchanger life in more detail, explaining the factors that impact the life of the heat exchanger, things you should do to maximize the life of the furnace heat exchanger, and similarly, things you should not do because they are likely to destroy your furnace before its time. Sometimes the heat exchanger fails, either from cracks produced by continual expansion and contraction due to heating and cooling of the metal, or from rust. If the part is under warranty but not available, ask the contractor to call the manufacturer and request the cost of the. The furnace heat exchanger is the one of the main components inside the gas furnace and its used to transfer the heat from the. A cracked heat exchanger allows air from the furnace blower to interfere with the flame causing it to flutter or even roll out. Dec 02, 2015 the most common cause of an overheated heat exchanger is as simple as a dirty air filter.
The long reaction of combustion gas and metal leads to corrosion that weakens the exchanger and allows cracks to form. Because it allows the exhaust fumes inside the exchanger to leak into the air. An oversized furnace can also cause overheating and heat exchanger cracks. That showed us more of the heat exchanger, but it still didnt show us. A cracked heat exchanger might allow products of combustion to enter the air stream. This video is about the your heat exchanger is cracked so your furnace must be replaced scam. Stock photo by serdiukigor 0 10 manufacture of a new heat exchanger with tube bundle stock photos by shinobi 0 0 replacement of thermal insulation on old rusty heat exchanger pictures by shinobi 0 0 welding works on metal heat exchanger using manual arc welding stock photography by shinobi 0 2 long heat exchanger at top maintenance site. A heat exchanger is made of thin metal, and as it heats up from the combustion of the furnace, it transfers the heat to the air being distributed through the house by the blower 3. Mar 17, 2012 for a good example of a hazardous heat exchanger, check out the photo below showing a large rust hole in the heat exchanger of this highefficiency furnace that was only ten years old.
If there is a crack in the furnaces heat exchanger, there will be some signs and symptoms that are normally evident concerning the furnace. A cracked heat exchanger is one of the most basic and common symptoms, and also often the most drastic sign of a damaged heat exchanger. Now that weve covered some common symptoms concerning a heat exchanger with a crack in it, lets get into some of the likely causes. Its the most common cause of excess carbon monoxide in a home. Search from 60 top heat exchanger pictures and royaltyfree images from istock. A cracked heat exchanger not only spoils the performance of your furnace, but it will also create a safety threat to you and your loved ones. Mar 11, 20 meanwhile, your heat exchanger will go through a lot of stress when it is constantly overheated and cooled back down.
Read our blog to learn what to do if this happens to you. Cracks in a heat exchanger can allow gases, including deadly carbon monoxide, to leak into areas all around the furnace, which in many cases is a home. Over time, the heat stress causes cracks near weak areas such as bends or welds. Over time, the constant exposure to heat and other caustic substances causes the thin metal walls of the heat exchanger to develop cracks. A look at a heat exchanger crack that cant be found youtube.
For this reason, i want to share with you some of the common symptoms and causes of a cracked heat exchanger in a furnace. It is important that the heat exchanger is taken care of as hazards can build from a faulty exchanger. Pdf repair of tubetubesheet weld cracks in a cracked gas. If the heat exchanger is cracked, byproducts of the combustion process that takes place within the. Home warranties and cracks in your furnaces heat exchanger. If you have an iron heat exchanger, then you need to find an iron repair liquid, which uses chemical reactions to seal holes in iron. The dangers associated with a cracked heat exchanger.1 797 1465 185 1024 380 1521 1265 328 402 729 1028 7 1424 1346 1329 871 1105 39 698 1163 1467 782 1462 1217 459 860 1469 209 117 884 1058 61 885 1217 1446 406 561 791 1188 1241 174 1054 732