Ground source heat pumps by their nature are relatively large units, with fittings normally a little larger than those found on common fossil fuel systems. However, within the large kit there are several smaller parts which perform important functions and generally go unnoticed and, unless included as part of a comprehensive service package, unchecked until something goes wrong. One of these parts are the Automatic Air Vents (AAVs) which are normally located in an inconspicuous area away from unregistered installers and DIY fanatics. Leaking AAVs are a common problem that due to their discreet placement are often not picked up until a service is carried out.
AAVs perform an important function in expelling air from hot water systems. Not only can trapped air cause gurgling and banging noises throughout the system, if excessive quantities continue to be trapped then this points towards a potentially more serious problem. As AAVs expel air a hissing sound can be heard, with the AAV closing once air has escaped in order to prevent leakage of central heating fluid. Therefore if you are regularly allowing air to bleed from the system contact us to speak to one of our engineers. They are always happy to offer impartial advice and help you decide whether closer inspection is necessary.
Due to their proximity to the heating fluid it is common for AAVs to gunge up over time, and for residue to leak from them – as is shown in the photo. This will affect their performance and if allowed to continue for too long the possibility of the AAV becoming completely blocked and not able to perform its function becomes a distinct likelihood. It is normally more practical to replace the entire leaking AAV unit rather than try to clean it. For clients who hold one of our heat pump or biomass boiler maintenance contracts this is often one of those areas where they find that an ongoing service schedule provides small additional benefits which contribute to longer-term reliability for the system. We only source our parts from established suppliers such as BSS, so you can be confident that high quality kit is being used that will last longer than cheaper solutions.
If you have noticed a sticky or gungy fluid leaking from an AAV, or are constantly required to release air from the system, then contact us and one of our expert engineers will be able to discuss with you how to alleviate the problem.
You can contact us here, email us or simply pick up the phone and call 01483 603090. We are here to help you!