www.heatingandventilating.net


can be used with Vaillant boilers in a cascade set up with up to seven boilers, would recognise this fault and simply use one of the others to continue delivering heating and hot water. The backup units in a cascade system do not


sit idle, they are fully operational under normal circumstances. This is because the operator can programme the controls so that all units, including the spare ones, work on a rotational basis and manage changeovers. There are two important advantages to this set-up. By spreading the load, the risk of breakdowns in all units can be reduced,


Left: Mark Wilkins from Vaillant


Below: To ensure heat security, redundancy is built into a commercial heating system using ‘spare’ boilers


Commercial heating


and their life can be prolonged. Using the back-up equipment regularly also ensures that they would operate when needed. There are other circumstances where the inclusion


of back-up boilers could result in even greater oversizing. For example, in a small building with a heat demand of say, 60kW, it is more cost-effective to install two 60kW than multiple 20kw units. In this case, the system would be oversized by 100%. But if usage is rotated equally between the two units, their lifespan could in theory, nearly double. So, a product such as a Vaillant commercial boiler could operate well beyond the 15-year industry-expected lifespan. Contrary to myths, such a system where the


boilers are cascaded do not waste energy. They are controlled so that only some of them are fired up to provide the amount of heat required at any particular time. Vaillant’s VRC 700 can automatically manage this process for cascade installations with up to seven Vaillant boilers and integrate with any BMS. If there are more than seven Vaillant units, they can integrate directly with the BMS so that building operators can manage their heating in the most energy-efficient way. Plant sizing shouldn’t be exceeded, and system


diversity factors should be used correctly. However, plant rooms must be capable of all the challenges it is designed for. Having redundancy in a heating system not only prepares a building in the event of breakdowns but can also extend the lifetime of the system when designed and controlled wisely.


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This is an ART 167 PN25 Swing Check Valve


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This is Steve Warehouse Manager


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