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the last 25 years which have all been completed with Hamworthy boilers. We specified the Varmax- based on resilience and life expectancy. Other than this, we find the pull-out step on this model and the integral light fitting to be very practical for commissioning and servicing the boiler.” Commenting on the installation, which was c ompleted byWatertite Heating, Mike Dennett, projects director for the company, says: “The heating design comprises of a gas-fired, pumped low pressure hot water system f ed from the two Varmax floor standing condensing boilers in the plant room, complete with purpose made flue system. Hot water service is provided from two Dorchester DR-FC Evo gas fired condensing water heaters, also with customised flue sy stem.”
A Trend building management system provides weather compensation and boiler sequencing. While the former means the flow temperature in the system is adjusted according to outside temperature to avoid energy wastage, the latter ensures the Varmax boilers run under sequence control, meaning both boilers can operate at more efficient low fire together rather than one at high fire. This also evens out use across the installation, improving the lifetime of the equipment.
Hot w
Hot water supply and Legionella Two Dorchester DR-FC Evo 45 direct fired
condensing water heaters with a gross thermal efficiency of 96% deliver a combined continuous
output of 1,940 l/h (44°C ∆T) to satisfy the hot water needs of the care home. A destratification kit, consisting of a pump as well as a purpose-made flue system were also installed.
Andy elaborates: “We chose separate direct fired water heaters because they allow the heating boilers to directly compensate for heating with no compromise to efficiency upon hot water demand. The Dorchester DR-FC Evo model was selected for its condensing technology and proven reliability continuing the long line of Dorchester water heaters we have specified over the years.”
The water heaters and chosen ancillaries ensure residents are protected from Legionella. While the destratification kit distributes hot water evenly throughout the vessel to prevent the bacteria from multiplying, the water heaters include an anti- Legionella function which heats the contained water up to 65°C for an hour to kill any present bacteria. This can be run automatically for continuous safety.
A modern, comfortable building for elderly residents
A modern,
Apart from the heating and hot water system, ventilation systems have also been installed along with modern comfort cooling systems in several (mainly communal) areas.
On the project, Mike Dennett reflects: “Colten has always allowed reasonable space for the plant room. The principals of the company understand the
Commercial heating
importance of allowing enough room to install and maintain the heating and hot water plant. As a company,Watertite Heating is very proud of the standard of our mechanical installation both within the plant room and throughout the entire building. We believe the Art Deco design and attention to detail really do make this latest edition to the Colten portfolio a true flagship for their brand.” On working with Hamworthy, he adds: “The support I receive from Hamworthy’s area sales manager is always excellent. Data sheets and brochures are also easy to download, making forward planning easier. Lastly, delivery dates were agreed in advance and adhered to.”
Andy Cope comments: “As a practice, we have been specifying Hamworthy products for over 40 years. They are based locally to our offices and have provided us with excellent technical support and after-sales service.”
Steven Pinder, site manager for Colten
Dev elopments who worked withWatertite Heating and Mabey Francis on the project, concluded: “We at Coltens are pleased as a local business ourselves to be using another local company which has proved more than capable of providing an excellent product with an excellent service.
This installation joins the other 20
nursing/residential homes all of a similar size in the Colten group that have been completed using Hamworthy products. The whole installation has gone smoothly without problems and we’re very happy with the result.”
Protect public health with WRAS-approved valves.
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Valves for hot-water systems need to protect public health while providing safe outlet temperatures. Our range of WRAS-approved valves is designed to meet all relevant public health regulations – so they can be installed in schools, hospitals, hotels, airports and reliability and compliance.
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Specialist Suppliers of Industrial and Building Services Valves 17
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