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Heat Exchanger Problems
What is a heat exchanger?
A heat exchanger is a device that circulates a liquid or gas through tubing inside it. Depending on whether your HVA unit is set to heating of cooling, the liquid or gas will be warmer or cooler than the ambient temperature. As air blows over the tubes of the heat exchanger, it absorbs the heat or cold from the tubes and changes the temperature on the home. Heat exchanger are found in refrigerators, water
and a wide range of appliances. Read below where Experts have given answers to heat exchanger questions.
A check with a carbon monoxide detector found that there is a leak from the seam at the top of the heat exchanger on my Rheem 1603-25 gravity floor furnace. Is it safe to weld it closed?
Carbon Monoxide is a very hazardous gas and welding the a seam closed to stop a leak is not recommended as it could happen again. Replacing the heat exchanger is the safer option.
How do you connect titanium heat exchanger tubing to copper tubing?
The best way of connecting 2 dissimilar metals is with a mechanical connector like a Sharkbite or some other device with a push lock coupling. Please check the rating of the coupling. Most are rated at 240 plus degrees which should be fine as tube temperatures are generally well below this.
The heat exchanger on my 18 year old Teledyne Laars model HH0400C hot water boiler has ruptured and is leaking water all over. I have a quote for $6,000 for replacing the heat exchanger. Would it be better to replace the whole boiler?
Teledyne Laars is a good make and if yours is an old cast iron model, it can last up to 30 years and more. It is always advisable to get more estimates to try for a better price and consider replacing the heat exchanger instead of spending money on a new boiler.
My17 year old Evcon DGRT070AUB (gas forced air) heat exchanger has developed a crack. Is heat exchanger repair advisable or should I buy a new one?
With a 17 year old unit replacement instead of repair is the most advisable. Most heat exchangers come with at least a 20 year warranty, in which case you will only pay the labor cost. Check the plate with the serial number. There is generally a date code there. Once you know that check your warranty to see if it is still valid and if you don’t have the information, contact the company and see if the warranty coverage still exists.
How often should a heat exchanger be descaled?
The frequency of heat exchanger descaling depends on various factors, especially water hardness. In general, it should be done once every 2 to 3 years. A professional service company or Expert should be used to inspect the unit and the scale to determine the best cleaning method. An Expert can also give you an idea of how frequently it should be done based on their knowledge of your local water. You can also consider a water softener if you have hard water. If you have an open loop system, it will use a continuous supply of water untreated water which will lead to much greater scale formation
Whys is there a flame outside the heat exchanger? The burners ignite but the first one has a wide flame that does not completely enter the heat exchanger. I changed the burners, but it made no difference.
The common reason for this happening is a blocked cell in the secondary exchanger. It could be due to water or slime. You could try plugging the top hole tightly and using a tube or hose from an air tank to blow out the blockage. If this does not help it would be best to get a technician to check the unit. Heat exchanger replacement because of this problem is not uncommon.
A defective heat exchanger can affect the efficiency of your HVASC system or your water boilers. Care must be taken when dealing with heat exchanger problems as the tubing inside is easily damaged. It is best to consult your owner’s manual when attempting any heat exchanger repairs and if the help you need is not to be found there, getting the advice of an Expert is the best alternative.
Recent Heat Exchanger Questions
I do not know who could help me~I had bought a new furnace
I do not know who could help me~I had bought a new furnace last August~I live in a Condo and it was a heat exchanger and I paid nearly $6000.00 for it~the day the technician installed it he could not get the heat to work but did not make a big deal out of it~ he said that he would be back in September but never showed up~ I had to call in November as I was cold~he came about 10 times and tried different things and left saying it worked~but when he left I was still cold and no heat was coming~he replaced the thermostat even~I had to purchase four large space heaters and even at that I was cold~my power bills were crazy high and in Canada we have long and cold Winters~I am 70 years old now and I hate cold~ the Unit has back up heaters ~ on the floor in electric~ but only are used as a back up in extremely cold weather~I had all of them on~ Plus I broke my new oven trying to use it to keep warm~ and it did not work like the older models and it cost me $200.00 to fix it~Finally my son got another company in to look at it and right a way they found four things wrong with it~I had to pay them $400.00~this made my own company really upset and said now they could not get me a new furnace~they finally sent it to New York where the factory is~it is a Daikin model~it came back and the company who I bought it from would not tell me what was wrong with it~I went above their heads to a man who supplies these models and he got the answer~ it was a leak on the bottom of the evap coil where the distributer tube is brazed in~how serious is this and should the technician have picked up on it~I was so relieved that something was found~ as I was being thought of as a pest and a complainer when I would call and they treated me very rudely~ the Technician originally dated me ~ after the day he installed it he made advances~so I also was made to feel that I was using this as an excuse for him to come here~I lent him $5000.00 to put a down payment on my son's BMW~ he had to sell it as he needs the money as he is divorcing~I added this to make you see how much money I am out over this whole deal and he never paid me back and he is out of my life now~ he was to drive me to see all these places~I own two vehicles but am afraid to drive in a new city~I moved here after my husband died and I am from New Brunswick~I now live in Ontario~Thanks for any explanation of the problem and why would they not want to tell me the reason for this disaster~Martha
Munchkin t80m stopped due to low water pressure. I let water
Munchkin t80m stopped due to low water pressure. I let water in up to pressure. Now no sparking. Cleaned heat exchanger coil...not bad, some dampness, condensation, I guess, not leaking. All switches close. Blower comes on, but not max speed. No readouts on this used unit I swapped in last winter. ?????
I have a Rinnai Energy Saver 556 F that I have have had for
I have a Rinnai Energy Saver 556 F that I have have had for approximately 12 years.
For the last 6 months when I turn it on and it begins to cycle I hear a pop sound that was not present before.My wife and I are concerned for safety. Should I have it looked at. I'm considering replacing the unit with a Rinnai FC 824 vent free unit. I prefer not spending money on a repair technician if I should
Be replacing the unit.
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