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BSEE


For those installing and maintaining domesc central heang systems, Richard Crisp at Fernox provides a breakdown of the key changes made to BS 7593:2019 as well as the Benchmark Commissioning Checklist.


efficiency, minimise fuel wastage and ensure system longevity. Now, industry standards are being updated to reflect this and further


F Clean


BS 7593:2019 recommends that central heating systems are properly cleaned either before a new boiler is installed or with the new boiler isolated from the rest of the system. This is to prevent any existing sludge or debris within the system reaching and depositing in the boiler and causing lasting damage. The system should also be cleaned before dosing with chemical water treatment or installing an in-line filter. Again, this is to remove any existing contaminants.


Installers should use a recognised cleaning method such as powerflushing, mains pressure or gravity cleaning. High quality products such as Fernox Cleaner F3 can be used to accelerate the cleaning process, by removing flux residues and other debris.


encourage installers to adopt a best practice approach to domestic central heating system maintenance.


Published in May 2019, BS 7593:2019 provides clear guidance on the preparation, commissioning and maintenance of domestic central heating and cooling water systems. The code of practice covers five key areas: clean, guard, protect, maintain and test.


Most recently, changes were made to the Benchmark Commissioning Checklist. Acting as documented evidence of correct boiler installation and servicing, these changes are yet another step towards ensuring that the correct measures are taken, and systems are fully protected and continue to perform at optimum level.


Guard


To guard the system, BS 7593:2019 says that an in-line system filter should be installed to capture any sludge and debris that forms. This will prevent it from circulating through the system (which is when damage to system components can occur). The importance of installing an in- line filter has also been reinforced by recent changes to the Benchmark Commissioning Checklist. The Water Quality section of the Checklist now asks installers to state whether a ‘primary water system filter’ is pre- existing, fitted or not required. For ease, opt for a filter that can be installed and cleaned quickly, and via a simple and mess-free process. Having maximum installation flexibility and no risk of leaks is also crucial, to keep time on site to a minimum and reduce disruption to the end customer.


Sealed filters like the Fernox TF1 Sigma Filter and TF1 Omega Filter will offer these benefits as they do not utilise a lid or require replacement ‘O’ rings; meaning they remain watertight even after the cleaning process.


Protect


Protecting the system can be achieved by dosing with the correct quantity of chemical water treatment. This is a vital process under BS 7593:2019 to prevent corrosion, scale and microbial fouling for low temperature heating systems.


It is important to ensure that the correct amount of chemicals is dosed through the system as, if under-dosed, the chemicals will not be as effective, resulting in the formation and build-up of harmful sludge and debris.


To check that this process has been carried out, the Benchmark Commissioning Checklist’s section on system treatment now includes additional fields and asks installers to provide information on the brand and type of chemical water treatment used to dose the system. There are a number of chemical water treatment products available on the market sold in standard sizes, for example, a 100-litre system. Although the chemicals may be effective, one bottle might not be enough to treat the system sufficiently. Installers therefore need to calculate how many bottles are required for each individual system to ensure adequate protection. To avoid any room for error or doubt, opt for products such as the Fernox ‘F’ range of 500ml and Express 400ml chemicals. These have recently been reformulated and one bottle can now sufficiently treat over 97% of homes in the UK. That is because they can treat larger, new and existing central heating systems up to 130 litres, 16 radiators or 250sqm of underfloor heating, which makes the dosing process far easier, as only one bottle is needed for the majority of homes.


Maintain


BS 7593:2019 suggests that in-line system filters are serviced as part of the re-commissioning process, ideally as part of the annual boiler service and according to the


manufacturer’s instructions. This process will remove any sludge or debris that has been captured and ensure that the filter continues to work at optimum efficiency.


22 BUILDING SERVICES & ENVIRONMENTAL ENGINEER JUNE 2020


To ease the cleaning process, think carefully about the type of filter selected. Sealed filters can be easily cleaned by removing the magnet from the sheath and flushing the magnetic and non-magnetic debris from the filter, using the drain valve located at the base for easy access. This process does not require any disassembly of the filter or a system drain down, saving valuable time and reducing any system downtime. There is also no need to replace an ‘O’ ring, which minimises hassle for the installer as well as any future maintenance costs for the customer.


Test


Finally, BS 7593:2019 says an on-site test of the system water should be completed annually. The Benchmark Commissioning Checklist now asks installers to state whether the system inhibitor concentration has been checked and if appropriate action has been taken, and in accordance with BS 7593:2019. The Fernox Universal Test Kit includes everything required to help achieve this, with on-site tests for water turbidity, pH levels and water hardness, as well as the presence of chemical water treatment using the Protector Reagent supplied. In addition to testing on site, a sample of the system water should also undergo a laboratory test every five years. The Fernox Water Quality Test Kit is an ideal solution. Simply take a sample of the system water and send it off to the Fernox laboratory, where the technicians will conduct an analysis of key system water parameters. To make it simple to keep track of individual samples, take advantage of the Fernox Water Quality Test App. Simply scan the QR code on the sample bottle, and you can receive test result updates, passes and fails, via the app within 24-48 hours of receipt of the sample. Following this five-step process is a simple way to comply with BS 7593:2019. In addition, by carefully choosing water treatment products and turning to reputable


manufacturers for technical support will help to maintain a clean and efficient system as well as to maintain and meet the current industry standards.


www.fernox.com Read the latest at: www.bsee.co.uk


or many years, the water treatment industry has been championing life-long protection of central heating systems, to improve energy


WATER TREATMENT Changing Standards: Your StepbyStep Guide


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