What causes a heat exchanger tube to fail?
Chemically-induced corrosion can result in the pitting of heat exchanger tubes to the point where pinholes form and the tube fails and leaks. Pitting results from the electrochemical potential set up by differences inside and outside of, what is commonly referred to as, a concentration cell.
Are there any problems with carrier heat exchangers?
The complaints specified that Carrier manufactured more than three million units with an inferior material in the secondary heat exchangers that may cause premature corrosion and failure. Carrier denies these allegations.
What should I do if my heat exchanger cracks?
If the problem is not evident, make the company reinstall your old furnace and report them to the Better Business Bureau . Unfortunately, heat exchangers cannot be repaired. When a heat exchanger cracks or rusts through it must be replaced. Because the heat exchanger is at the center of the furnace, nearly the whole furnace must be disassembled.
What causes a heat exchanger to rust on the inside?
An over-sized furnace heats the home so quickly that the furnace shuts off after only a few minutes, so the heat exchanger stays wet and rusts from the inside out. The frequent cycling of an over-sized furnace also increases the expansion – contraction heat stress on the heat exchanger.
What causes a secondary heat exchanger to fail?
Other failures. If your secondary heat exchanger is plugged this will cause additional wear on your blower motor causing more electrical consumption and may cause a premature failure of the motor. What are the most common heat exchanger failures? 1. Cracks, fractures, pitting, holes and ruptures 2. Hot spots, warping, bulges and heat stress 3.
What causes a heat exchanger tube to crack?
Heat exchanger tubes are vulnerable to tears and cracks due to accumulated stresses related to constant thermal cycling or high temperature differentials. Thermal fatigue occurs when extreme temperature differences between the shell and tubes result in tube flexing. Significant tear in a copper tube due to extreme temperature differences.
Is it dangerous to have an old heat exchanger?
If your home has an older furnace—15-20 years old or more—then it’s extremely important for you to be aware of the potential danger posed by an old heat exchanger. The heat exchanger is the heart of the furnace. When it fails, it doesn’t just leave you without heat. It can create a very dangerous, even deadly situation.
Why do heat exchangers need to be replaced?
In many instances excessive steam pressure loss prevents further plant growth at higher production capacity. To enable capacity increases, the process plant will have to replace various pieces of Heat Exchanger equipment which will allow the capacity increases required.
