Fan coil units


The use of commissioning modules has been shown to bring significant time and cost savings on commissioning


(BMS) monitoring blended tem- peratures across all of the heating or cooling plant. However, this overview doesn’t provide the more granular visualisation that will enable problems to be pin- pointed. For instance, issues with just some fan coil zones will impact the overall T, even when other zones are operating perfect- ly. Therefore, making adjustments to the entire system could upset the balance of zones that didn’t require any fine-tuning.


The answer to improved visibil- ity is to provide more extensive sub-metering. However, the cost of fitting measurement devices to each individual terminal unit would be prohibitive for the majority of projects. A more sensi- ble approach is to introduce sub- metering at a level that provides sufficient visualisation detail of system performance without breaking the bank.


Commissioning modules with integral measurement


The obvious answer is to make use of commissioning modules – a highly effective and proven engi- neered solution – and to exploit the latest monitoring technologies to integrate flow measurement and data logging within each module. Recent technological advances have made this both


FloCon Watchman combines the advantages of FloCon commissioning modules with SAV’s innovative Watchman solution, providing real-time performance data for fan coil and chilled beam systems.


possible and financially viable. Commissioning modules pro- vide a centralised ‘header’ for fan coil and chilled beam systems, act- ing as a distribution hub for a group/zone of terminal units, sited in a convenient, easily accessible location. Typically, the modules are pre-fabricated and tested under factory conditions before delivery to site.


Now, it is possible to equip each of these ‘centralised distribu- tion hubs’ with an electronic flow measuring device and data logger. Each device will continuously monitor the T across all of the ter- minal units connected to that com- missioning module. Linked to the building management system, these devices therefore provide real-time visualisation of the per- formance of each zone, so that it then becomes easy to identify localised issues that are impacting on overall system performance. Crucially, each module incorpo- rates all of the valves required for commissioning, including 2-port actuated control valves and a dif- ferential pressure control valve to


ensure that all 2-port control valves operate with excellent authority. This means that when an issue is identified, that zone can be easily re-configured from the central module, rather than needing to access each terminal unit in the ceiling void.


This approach makes the intro- duction of sub-metering financial- ly viable as the number of meas- urement devices is limited to the number of zones, rather than the number of terminal units. Furthermore, use of commission- ing modules has been shown to introduce significant time and cost savings on commissioning. A BSRIA study has shown that com- missioning modules save 28 per cent of installation time, 43 per cent of the time required to flush horizontal mains pipework, 23 per cent of time spent flushing fan coil unit circuits and 44 per cent on commissioning time – compared to traditional systems with com- missioning valves on individual terminal units.


It’s also worth mentioning that use of a data logger within each


commissioning module to monitor energy consumption provides Automatic Monitoring and Targeting (aM&T) in line with CIBSE TM39. It also helps to achieve an improved energy rating under the Building Regulations Part L. Furthermore, this informa- tion can also be used for billing of tenants or departments, adding more value for the end client.


The solution has landed There can be no doubt that soft landings are going to become an increasingly important element in building services specifications, resulting in closer scrutiny of those specifications by the client. Adopting an approach that pro- vides building operators with the performance information they need, plus the wherewithal to makes changes very easily – and save them money on installation and commissioning costs – is clearly an approach that is totally aligned with the concept of soft landings. // The author is the product manager for commissioning modules at SAV Systems //


Standard FCUs with simplified selection


A new range of fan coil units has been launched said to serve organ- isations that need standard units with simplified selection, while still retaining high performance levels, predictable sound levels and are available on fast delivery


Mike Holding, managing direc- tor of Dunham-Bush, says the CRE series, a range of horizontal fan coil units “satisfy those require- ments and represent excellent


value where the additional fea- tures of more costly units may not be required”.


Manufactured in Portsmouth, the units are configured with EC fan motors which result in signifi- cant energy reduction of up to 60 per cent, with infinitely variable speed controlled by on-board adjustment or BMS interface. The new units are an ideal solution for the cost effective treatment of


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commercial and industrial build- ings without compromise on high standards of engineering quality. Holding continues, “The CRE units are perfect for providing effi- cient and effective cooling and heating to most buildings includ- ing commercial office and retail spaces, hotel common areas, bed- rooms and restaurants.”


The units are available in 10 sizes and can be concealed for


installation into ceiling voids at least 250mm deep and comprise a galvanised steel inlet plenum with inlet filter, fan/motor section, cooling coil, discharge spigots and optional electric heating.


Each CRE fan coil unit is supplied individually packed, complete with specific installation instructions, wiring diagrams and clearly visible unit reference to ease identification at site.


HVR | July 2014 | 33


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