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  • BSI
    BS 4856-2:1975 Methods for testing and rating fan coil units, unit heaters and unit coolers - Thermal and volumetric performance for cooling duties: without additional ducting
    Edition: 1975
    $442.60
    / user per year

Description of BS 4856-2:1975 1975

Part 2 of this British Standard deals with methods of carrying out thermal and volumetric tests of unit coolers without additional ducting. The unit coolers operate with or without condensation on the coils. The unit coolers are of the type used for cooling and dehumidifying purposes under frost-free conditions of operation. The cooling medium used is water or other heat transfer fluid (excluding volatile refrigerants). The range of approximate air volume flow rates is between 25 × 10–3 m3/s and 5 m3/s.

The tests are to be carried out on units in an essentially clean condition.

This standard applies to units having operating temperatures of primary fluid within the range 0 °C to 27 °C.

The primary fluids used are; water, brine, glycol, heat transfer fluid.

The minimum temperature differential (see 14.2) of the primary fluid under test is 3 °C.

There is no restriction on the mounting of these units for testing provided that they are tested whilst mounted in a way representative of their intended use.

The standard specifies performance characteristics that are to be obtained from a unit. Although the requirements of the methods for individual tests may be followed to determine the performance of a unit at one specified set of conditions, where the performance at conditions other than those of the actual test are to be stated the full schedule of tests specified in the standard have to be made.



Coolers as used for cooling and dehumidifying under frost-free conditions, the medium used being water or other heat transfer fluid (excluding volatile refrigerants).

Standard NumberBS 4856-2:1975
TitleMethods for testing and rating fan coil units, unit heaters and unit coolers - Thermal and volumetric performance for cooling duties: without additional ducting
StatusConfirmed
Publication Date1975-09-30
DescriptorsTemperature measurement, Fan coil units, Flow rates, Air treatment devices, Cooling, Graphical methods, Performance, Air, Flow measurement, Thermal testing, Unit coolers, Humidity measurement, Ratings, Test equipment, Performance testing, Air-conditioning equipment, Heat exchangers
ICS97.100.01 Heating appliances in general, 91.140.30 Ventilation and air-conditioning systems
CommitteeRHE/6
ISBN0 580 08903 7
PublisherBSI
Pages36

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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