Hydronic heating and cooling systems like air-conditioning units, hot-water radiators and other heating devices use circulator pumps to circulate the water which it uses as the medium for transferring heat. Typically, circulator pumps have cast iron components and in order to maintain the functionality and efficiency of the heating or cooling device, cleaning these components is important. Although cleaning cast iron surfaces may look difficult, there are actually some materials you can easily find in your home for this task.
Some grime and sticky residue can accumulate on cast iron surfaces, and these are usually hard to remove. You can use a paintbrush to coat a layer of mineral oil onto the surface of cast iron components as this will help loosen hard grease and grime. Leave the mineral oil to sit for some hours until the hard residue loosens. You can then use a clean towel or rag to wipe away traces of the oil and grease and sticky residue along with it.
Dust, dirt, cobwebs and any loose sediment can also accumulate along the cast iron components of circulator pumps. You can use a plastic scraper to scrape off these loose particles from the cast iron surface.
Cast iron is susceptible to rusting so it is not uncommon to find any rusted areas on the components of your circulator pump. Scrub off any rust spots on the cast iron surface with the use of a wire brush. Scrubbing must be done in gentle strokes and repeated until the rust has been removed thoroughly. After the rusted spots and areas have been cleared, you should dust off the cast iron surface. You can use a soft cloth or duster to dust off any of the rust particles and residue that have come loose from scrubbing.
You can use cooking oil for any scratch marks or stains along the surface of the cast iron. Dampen a rag with a few drops of cooking oil and rub off the scratch marks.
Liquid Dishwashing Detergent
You can use a combination of liquid dishwashing detergent and water to come up with a sudsy mixture that you can use to clean the surface of cast iron. This will remove any dirt, oil and grease that are otherwise difficult to remove using dry materials. Pour cold and clean water into the bucket and mix in some drops of the liquid dishwashing detergent. Dampen a lint-free microfiber cloth or a clean towel into the mixture and wipe the components. You can use a dry towel to wipe off traces of the sudsy water afterwards. For sticky and caked-on residue, you can also use an undiluted form of the liquid dishwashing detergent. Put a few drops of the dish washing detergent on the sticky and hard residue. Wait about 10 or 20 minutes before using a sponge to rub off the stains.
With these basic household materials and cleaning processes, you can help maintain the service life of any device that has circulator pumps with cast iron components.