FAN COIL UNIT GROUP

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The aim of the HEVAC Fan Coil Unit Group is:

To promote the effective use of Chilled Water Fan Coil Units within a buildings environmental system by supplying meaningful and definitive specifications from which engineers can make considered decisions.

HEVAC Factsheet – Guidance on FCUs in residential applications December 2018

Guidance on FCUs in residential applications covers design considerations, commissioning and service and maintenance. This FCU Group factsheet gives current guidance (December 2018).

HEVAC Factsheet – How viable are Airside Fan Coils in 2022

Guidance on Airside fan coils, general arrangement, how they work, disadvantages. This FCU Group factsheet gives current guidance (Feb 2022).

BS 8850:2020 Fan coil unit performance. Determination of specific fan power.

Test method was published on 27 August 2020. Available from BSI Shop.

NEW – Fan Coil Industry statement: COVID-19 and fan coils, 5 August 2021

There is a significant amount of information available with respect to the operation and use of fan coils and COVID-19. Here is a summary of the latest guidance which, if followed, would allow Fan coils to be used.

View Full Industry Statement

NEW – HEVAC FCU Group Factsheet – Guidance on Electronically commutated (EC) motors

View factsheet

NEW – HEVAC FCU Group Factsheet – Guidance on Air Inlet Filters used in Fan Coils

View factsheet

New - Product Data Template for Fan Coils

The BIMHawk Toolkit is an online database and suite of software programs and utilities for creating, managing and integrating Product Data Templates (PDTs) & Product Data Sheets (PDS’s) with other digital systems (eg: native BIM authoring software applications). The toolkit has been developed by NG Bailey in collaboration with CIBSE and the CIBSE BIM Steering Group to enhance the production of PDTs and allow them to be easily integrated within BIM Authoring Applications.

A Product Data Template is a collection of Parameters that describe and define a specific Product or Product type. CIBSE PDTs are developed in conjunction with Product Manufacturers, Designers and Specifiers. Each PDT is rigourously peer reveiwed and made available for Public Comment prior to being published.
The PDT for Fan Coil Unit (FCU) is on www.bimhawk.co.uk/pdtlist2.php

Why use Fan Coil Units? Guide written in 2020

The FCU Group produced a short leaflet in 2011 and revised it in July 2020 to bring to your attention the many advantages of fan coil unit systems, which are summarised and compared with the attributes of alternative systems. (Download).

Summary of current standards; current but under review; and withdrawn standards

Current

BS EN 1397: 2021 Heat exchangers — Hydronic room fan coil units — Test procedures for establishing the performance

BS EN 16583: 2020 Heat exchangers - Hydronic room fan coils - determination of their sound power level

BS 8850: 2020 Fan coil unit performance - Determination of specific fan power - Test method

Current, but under review                          

BS 4856-1: 1972 Testing and rating fan coil units, unit heaters and unit coolers Part 1: Thermal and volumetric performance for heating duties: without additional ducting

BS 4856-2: 1975 Testing and rating fan coil units, unit heaters and unit coolers Part 2: Thermal and volumetric performance for cooling duties: without additional ducting

BS 4856-3: 1975 Testing and rating fan coil units, unit heaters and unit coolers Part 3: Thermal and volumetric performance for heating and cooling duties: with additional ducting

BS 4856-4: 1997 Testing and rating fan coil units, unit heaters and unit coolers Part 4: Determination of sound power levels of fan coil units, unit heaters and unit coolers using reverberation rooms

Withdrawn

BS 4856-4: 1978 Testing and rating fan coil units, unit heaters and unit coolers Part 4: Determination of sound power levels of fan coil units, unit heaters and unit coolers using reverberation rooms

BS 4856-5: 1979 Methods for testing and rating fan coil units, unit heaters and unit coolers Part 5: Acoustic performance; without additional ducting 

BS EN 1397: 1999 Heat exchangers — Hydronic room fan coil units — Test procedures for establishing the performance

BS EN 1397: 2015 Heat exchangers — Hydronic room fan coil units — Test procedures for establishing the performance

BS EN 16583: 2015 Heat exchangers - Hydronic room fan coils - determination of their sound power level

Acoustic guideFigure 2.1 from CIBSE Fan Coil Unit Guide

First published in 2009, the revised July 2021 edition of the Fan Coil Unit Group good practice guide to acoustics for fan coils is now available. New content includes vertical fan coils, variable air volume operation and “In duct” v “Radiated” Sound Power Levels. In addition, it contains worked examples of installations and gives advice on system components, the effect they can have, and the associated pitfalls that can occur, especially in relation to small scale projects.
(Download)

Achievement of Aim

  • Supplying Industry Standards for Testing of:
    • Sound
    • Thermal
    • Performance
    • Airflow
    • Coefficient of performance
    • Airside carryover / losses
    • Component Efficiency

Figure 3.3 from CIBSE Fan Coil Unit Guide

  • Provide Industry Guides on
    • Application of Fan Coils Units
    • Installation of Fan Coils Units
    • Maintenance of Fan Coils Units
  • Act as a partner to Government departments to define any future standards specifications
  • Provide Statistics to members of the Group to facilitate focused product development strategies
  • The promotion of Fan Coils Units as one of the most effective air conditioning options

 

Do FCU comply with the new Part L Building Regulations?

Yes they do. Members worked closely with the DCLG when they developed the new Part L in 2006 and they all supply fan coil units that comply with the regulations.

Some end users have had difficulty in understanding the requirements for Specific Fan Power (SFP) under the new Part L. To help, the FCU Group had prepared the following position statements:

  HEVAC position statement on Acoustic Design Principles Iss2.pdf

  HEVAC position statement on Airflow Commissioning Iss2.pdf

  HEVAC position statement on Entering Air Temp Iss2.pdf

CIBSE TM43 - Fan Coil Units

This Technical Memorandum, which at Ecobuild in March 2011 was described by CIBSE as one of their "Best Sellers", sets out to describe all aspects of fan coil unit technology and provides manufacturers, designers, site personnel and operators a comprehensive guide. Please link to the CIBSE page where you can get this publication.
www.cibse.org/knowledge/cibse-tm/tm43-fan-coil-units

A Comparative Study of Active Chilled Beam and Fan Coil Unit Energy Consumption

Following a previous study where fan-coil units (FCU) and active chilled beams (ACB) were compared under different operating conditions, the HEVAC Fan Coil Unit Group in FETA commissioned EDSL to compare their relative energy consumption under the same operating conditions.  For the results and the report ............
 

There is an article on the study in the Sept 14 CIBSE Journal - link is http://portfolio.cpl.co.uk/CIBSE/201409/special-fan-coil-units-efficiency/

A PDF of the article is available from here, but the above link is better resolution.

 

Links to useful Industry guides

BSRIA BG 29/2011 Pre-Commission Cleaning of Pipework Systems

BSRIA BG 2/2010 Commissioning Water Systems

CIBSE Commissioning Code W:2010 Water Distribution Systems

 

Last updated: 22/2/22