EN 1886:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ventilation for buildings - Air handling units - Mechanical performanceVentilation des bâtiments - Caissons de traitement d'air - Performances mécaniquesLüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Mechanische Eigenschaften und MessverfahrenTa slovenski standard je istoveten z:EN 1886:2007SIST EN 1886:2008en,fr,de91.140.30ICS:SIST EN 1886:19991DGRPHãþDSLOVENSKI
STANDARDSIST EN 1886:200801-april-2008

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1886December 2007ICS 91.140.30Supersedes EN 1886:1998
English VersionVentilation for buildings - Air handling units - MechanicalperformanceVentilation des bâtiments - Caissons de traitement d'air -Performances mécaniquesLüftung von Gebäuden - Zentrale raumlufttechnischeGeräte - Mechanische Eigenschaften und MessverfahrenThis European Standard was approved by CEN on 26 July 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1886:2007: E

Figure 1 — Position of this standard in the field of mechanical building services

EN 61310-1, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual, auditory and tactile signals (IEC 61310-1:1995) EN ISO 3743 (all parts), Acoustics — Determination of sound power levels of noise sources — Engineering methods for small, movable sources in reverberant fields EN ISO 3744, Acoustics — Determination of sound power levels of noise sources using sound pressure
— Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994)

Part 2: Measurements in situ (for acceptance and verification purposes) (ISO 11546-2:1995) EN ISO 12100-2, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical principles (ISO 12100-2:2003) 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 12792:2003 and EN 13053:2001 and the following apply. 3.1 air handling unit
real unit factory made encased unit serving as a prime mover of a ventilation or air conditioning installation where outdoor air, recirculated air or extract air is treated, consisting of a fan section where a filter section and heat exchanger may be connected. In addition the unit may consist of an inlet section with one or more louvres and dampers, a mixing section, heat recovery section, one or more heating and cooling coils, humidifiers, sound attenuators and additional equipment such as controls, measuring sections etc. 3.2 air handling unit
model box special test unit (defined in 8.3.2) used to execute measurements for general classification, comparison or categorisation of series or individual casings 4 Usage of real units and/or model boxes for the verification of mechanical performances For clear and non-ambiguous differentiation, it shall always be indicated whether the measurement has been made on the real unit or on the model box by using the letter "M" for the model box and "R" for the real unit in documentation. Test criteria of model boxes and real units are presented in Table 1.

Table 1 — Test criteria of model box and real unit Kind of casing Test criteria Model box (M) Real unit (R) Mechanical strength General classification of casing construction Particular classification of casing construction and individual evaluationAir leakage General classification of casing construction Particular classification of casing construction and individual evaluationFilter bypass leakage General classification of casing construction Particular classification of casing construction and individual evaluationThermal transmittance General classification of casing construction --- Thermal bridging General classification of casing construction --- Acoustic insulation General classification of casing construction ---
5 Mechanical strength of casing 5.1 Requirements and classification Air handling unit casings shall be categorised into classes in accordance to Table 2. Table 2 — Casing strength classification of air handling units Casing class Maximum relative deflection mm × m-1 D1 D2 D3 4 10 exceeding 10 NOTE The leakage test shall be done after the strength test.
For clear and non-ambiguous differentiation it shall always be indicated whether the measurement was made on the real unit or on the model box by using letter "M" for the model box and "R" for the real unit in documentation. EXAMPLE D1 (M) Class D1 and Class D2 casings shall be designed and selected so that the maximum deflection of any span of the panels and/or frames does not exceed the limits in Table 2 (see Figure 2).

± 2,0 mm per m frame/panel span) of the structural parts (structures and supports) or damage of the casing may occur. Table 3 — Test pressures Kind of casing Test criteria Model box (M) Real unit (R) Deflection ± 1 000 Pa Normal operating conditions at selected design fan speed Withstand maximum fan pressure ± 2 500 Pa Maximum fan pressure at selected design fan speed
Parts of the real unit, which are running under positive pressure, shall be tested under positive pressure. Parts of the real unit, which are running under negative pressure, shall be tested under negative pressure. Deviating test pressures shall be specified between the manufacturer and purchaser.

Key A
Panel deflection B
Frame deflection Figure 2 — Illustration of panel and frame spans of air handling units
The ability of the real unit to withstand the maximum designed fan pressure may be demonstrated by prior agreement between the manufacturer and purchaser, by blanking off the inlets to the unit and running the fan up to its design operating speed. Downstream sections of blow-through units shall be proved by blanking off the air handling unit's outlets. Any special requirements, for example the ability to survive shock loading caused by sudden closure of fire dampers, should be clearly specified.

Figure 3 — Deflection of panels and frames of air handling units 5.2 Testing Deflection shall be measured within an accuracy of ± 0,5 mm whilst the air handling unit is operating under test conditions. For example, referring to Figure 3, deflection X'X" is measured for span R'S', deflection XX" is measured for span PQ. Deflection X'X" is a function of panel stiffness. Deflection XX" is a function of both frame and panel stiffness. Frame deflection is RR' and SS'. EXAMPLE PQ = 2m R'S' = RS = 1 m Measured deflection XX" = 8 mm Measured deflection X'X" = 5 mm

l × s-1 × m-2 Filter class (EN 779) L1
L2
L3 0,15
0,44
1,32 superior to F9 F8 to F9
G1 to F7 NOTE
The maximal leakage rates given in Table 4 are according to the ductwork leakage classes specified in EN 1507 and EN 12237, (e.g. L2 = B), but the test pressures are different.
NOTE Class L1
for units for special application e.g cleanrooms. In the case of units tested at a pressure deviating from 400 Pa the measured leakage rate shall be converted into a value at reference pressure, using the following formula: 0,65m 400pressure test400
=ff
(1) where:
fm is the measured leakage rate at the actual test pressure;
f400 is the converted leakage rate at 400 Pa , see Table 4. Unless otherwise specified, the applicable rate shall be a function of the efficiency of the air filters within the air handling unit. Where there is more than one stage of air filtration, the classification shall be based on the efficiency of the highest grade of filter. NOTE For special applications by agreement, leakage class may be chosen independent from the filter class. Even if the unit is not equipped with filters, class L3 is still recommended.

Maximum leakage rate (f700) l × s-1 × m-2 L1
L2
L3 0,22
0,63
1,90 NOTE Class L1 for units for special application e.g cleanrooms.
In the case of units tested at a pressure deviating from 700 Pa the measured leakage rate shall be converted into a value at reference pressure, using the following formula: 0,65m 700pressure test700
=ff (2) where
fm is the measured leakage rate at the actual test pressure;
f700 is the converted leakage rate at 700 Pa , see Table 5. Air leakage tests on model boxes shall be performed at both 400 Pa negative pressure and 700 Pa positive pressure. 6.2 Testing 6.2.1 Test apparatus The test apparatus shall be as shown in Figure 4, using a fan with a duty at least capable of meeting the anticipated leakage rate at the respective test pressure(s). If the air handling unit is too large for the capacity of the leakage test apparatus (accuracy ± 3,0 %), or a restriction of access for delivery requires that the unit should be tested in sections or sub-assemblies, the breakdown should be agreed by the manufacturer and purchaser prior to the test date.

Key 1 AHU under test 5 Flow measurement device 2 AHU test pressure gauge 6 Inlet plate 3 Bleed valve as alternative to variable speed fan 7 Outlet plate 4 Variable speed fan
Figure 4 — Apparatus for testing the casing air leakage (negative pressure test). Typical example 6.2.2 Preparation for test The unit to be tested shall be put up in the plane in which it is intended to operate with its sections connected or joined by the method given in the installation instructions.

qvnom is the air flow rate of the filter section, see Table 6;
k is the filter bypass leakage rate, in percent of specified or nominal volume flow rate, see Table 7.
Table 6 — Air flow rate of the filter section (qvnom) subject to the kind of unit Kind of unit Test criteria Model box (M) Real unit (R) Volume flow rate Corresponds to a filter face velocity of 2,5 m/s (e.g. 0,93 m³/s
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