Cleaning Furnace Secondary Heat Exchanger

Secondary heat exchanger cleaning.

Cleaning furnace secondary heat exchanger.

Secondary condensing heat exchanger. Beware the fins of the coil are easily bent so keep your air pressure a few inches away from the coil surface. Here more heat is extracted resulting in the gases that are cooled to the point that they condense into water and carbon dioxide. Remove these with a screwdriver or ratchet in order to take the fan out.

In most cases this part looks much like a small radiator some have a baffle style exchanger which looks much like dishes setting in a dishwasher and 100 of the air blown from the fan must travel through it during both the heating cooling seasons. Most build up will be on the blower side or bottom of the reheat coil. A rheem rgda model furnace is used for the demonstration. If you crawled in then just take a vacuum cleaner with you and crawl in and clean away also a long handled brush will help.

Place your vacuum suction below the reheat coil and using air pressure carefully blow the coil clean. Usually that means neglected burners that are dirty or corroded but it could be other things. You can wrap a small piece of tape around each wire and label it to make reassembly easier just make sure to remove the. The secondary heat exchanger in high efficient furnaces are a very important component to have cleaned.

They will push you hard to either get it fixed immediately or replace the unit entirely on the spot. That was best avoided. Usually i d guess that lack of regular maintenance led to the sooting problem. Cleaning the secondary heat exchanger in a condensing furnace is usually difficult and a mess.

Some fans are held in by screws or bolts. Here are a few scenarios where duct cleaning may be necessary. A home heat exchanger is less likely to fail due to dirt and grime then a heat exchanger in a car or ship. The heat exchanger is connected inside the furnace or boiler with metal tubes that transport the water and air exchange.

To the best of my knowledge this unit does not have a secondary heat exchanger as it only has one heat exchanger. In condensing furnaces there is a secondary heat exchanger made up of small tubes that receive the exhaust gases once they have gone through the primary heat exchanger. I suggest a mask and goggles for safety purposes.