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Scope of the programme

This programme applies to selected ranges of Air Handling Units. Each range shall at least present one size with a rated air volume flow below 3 m3/s. All Real Unit sizes in the range up to the maximum stated air flow shall be declared. All Model Box configurations shall be declared.

Ranges without at least one size with a rated air volume flow below 3 m3/s are excluded.

Definitions

Air Handling Unit: A factory made encased assembly or flat-packaged unit that consists of a fan or fans and other necessary equipment to perform one or more of the following functions: circulating, filtration, heating, cooling, heat recovery, humidifying, dehumidifying and mixing of air. The unit should be suitable to be used with ductwork.

Range: A family of Air Handling Units of different sizes grouped under the same designation and using the same selection procedure.

Model Box: Construction envelope built according to specifications presented in manufacturer’s literature, used to establish mechanical, thermal and acoustical performance according to the relevant EN standards.

Real Unit: Unit from the range of a specific size, used to establish complete performance for all the available functions of the Air Handing Unit range, according to the relevant EN standards.

Sub-range: Part of a range using the same Model Box(es) and grouped under the same designation.

Deflection [mm/m]: The largest deformation of the sides of the unit under pressure, positive or negative, given as a difference in distance from a reference plane outside the unit to the external unit surface with and without test pressure. The deflection, related to the span, defines the casing strength.

Air leakage factor [l.s-1.m-2]: The air leakage in volume per unit of time, related to the external casing area.

Thermal transmittance [W.m-2.K-1]: The heat flow per area and temperature difference through the casing of the air handling unit.

Thermal bridging factor [-]: The ratio between the lowest temperature difference between any point on the external surface and the mean internal air temperature and the mean air-to-air temperature difference.

Filter bypass leakage [%]: Air bypass around filter cells as a percentage of rated air volume flow.

Acoustical insulation [dB]: Sound insertion loss value of the Air Handling Unit.

Heating capacity [kW]: Thermal energy supplied into the air per unit of time.

Cooling capacity [kW]: Thermal energy removed from the air per unit of time.

Heat recovery [%]: Heat transferred from exhaust air into supply air or reverse.

In-duct sound power level [dB]: Sound power level per octave band, radiated in the duct.

Airborne sound power level [dB(A)]: Sound power level radiated through the envelope of the Air Handling Unit.

Testing requirements

All performance ratings presented by manufacturers shall be verified by tests performed in the independent laboratory(ies) selected by Eurovent Certita Certification. The following standards shall be used as a basis for these tests:
  • EN 1886: “Ventilation for buildings – Air Handling Units – Mechanical performance
  • EN 13053: Ventilation for buildings – Air Handling Units – Rating and performance for unit’s components and sections.
Certified characteristics

Mechanical characteristics

The following mechanical characteristics are certified :
a - Casing strength (CS)
b - Casing air leakage (CAL)
c - Filter bypass leakage (FBL)
d - Thermal transmittance of the casing (TT)
e - Thermal bridging factor (TBF)
f - Acoustical insulation of casing

Performance characteristics

The following mechanical characteristics are certified :
a - Air flow - Available static pressure - power input
b - Octave band in-duct sound power level
c - Airborne sound power level
d - Heating capacity*
e - Cooling capacity*
f - Heat recovery*
g - Pressure loss on water side*

* If standard features of the product range

Comparison of the changes between the model box test according to the standard EN 1886

Model box
ObsoleteExisting
Each section have one access door.The operating side of each section shall have at least one access door (with hinges and standard closure, but no window) and shall include at least one fixed panel.
Weatherproof units shall not be covered (e.g. with a roof or roofing membrane) when the thermodynamic values are determined.
Assembling of the test from test engineer in test lab ccording to normal assembling rules by manufacturer.
Mechanical strength of the casing
ObsoleteExisting
Test pressure: ±1500Pa
Classification:
Max. deflection 4 mm => class 2
Max. deflection 10 mm => class1
Max. deflection > 10mm => class 1B

If after the test pressure of ±2500Pa the remaining deflection is less than 2 mm:
Max. deflection 4 mm => class2(A)
Max. deflection 10 mm => class1(A)
Test presure: ±1000 Pa
Classification:
The remaining deflection after a test pressure of ±2500 Pa must be less than 2 mm.
Max. deflection 4 mm => class D1(M)
Max. deflection 10 mm => class D2(M)
Max. deflection > 10 mm => class D3(M)
Casing air leakage
ObsoleteExisting

Test pressure: -400 Pa
Classification:
Max. leakage rate 0,44 l/sm² => class B
Max. leakage rate 1,32 l/sm² => class A
Max. leakage rate 3,96 l/sm² => class 3A

Test pressure: +700 Pa
Classification:
Max. leakage rate 0,63 l/sm² => class B
Max. leakage rate 1,90 l/sm² => class A
Max. leakage rate 5,70 l/sm² => class 3A

 

Test pressure: -400 Pa
Classification:
Max. leakage rate 0,15 l/sm² => class L1(M)
Max. leakage rate 0,44 l/sm² => class L2(M)
Max. leakage rate 1,32 l/sm² => class L3(M)

Test pressure: +700 Pa
Classification:
Max. leakage rate 0,22 l/sm² => class L1(M)
Max. leakage rate 0,63 l/sm² => class L2(M)
Max. leakage rate 1,90 l/sm² => class L3(M)

The leakage test shall be done after the strength test.
Filter bypass leakage
ObsoleteExisting
The filter frame shall be placed away from the section joints so that negative pressure impinges on the joint during the casing leakage test
Thermal tests
ObsoleteExisting
The assembly shall be supported by insulating blmocks, with the bottom or the base frame of the enclosure minimum 100mm above the floor of a draught-free room.The assembly shall be supported by insulating blocks, with the bottom or the base frame of the enclosure 300mm to 400 mm above the floor of a draught-free room (air velocity less than 0,1l/s).
The following shall be mounted inside the enclosure:
- electrical heater elements, controllable externally;
- one circular fan with a total free air volume performance of minimal 100 air changes per hour.
The following shall be mounted inside the enclosure:
- one or more electrical heater elements, controllable externally;
- one or more circular fans with a total free air volume performance equal to 100 to 110 air changes per hour, allowing the internal air temperature difference accross the measurement points to be not greater than 2,0K.
For the determination of the internal temperature 10 sensors are used.For the determination of the internal temperature 16 sensors are used.
The accuracy of the air temperature measuring device shall be 0,5K.The accuracy of the air temperature measuring device shall be 0,1K.
The external air temperature shall be measured et point 1,0 m distance from the center at all four vertical sides of the unit.The external air temperature shall be measured at point 0,25 m distance from the center of top, bottom and all four vertical sides of the unit.
Both sets of measurements shall yield a standard deviation not exceeding 1,5K during a period of 30 minutes.Both sets of measurements (mean internal/mean external temperature) shall yield a standard deviation not exceeding 1,0K during a period of 30 minutes.
Thermal transmittance
ObsoleteExisting
Temperature difference during measurement:
20 K to 25 K.
Temperature difference during measurement:
20 K fixed.
Thermal brdging
ObsoleteExisting
Temperature difference during measurement:
20 K to 25 K.
Temperature difference during measurement:
20 K.
For the determination of the internal temperature, the mean of all 10 sensors will be used.The model box will be divided in three parts.
For the determination of the internal temperature, the average of the 8 temperature sensors which limiting each section will be used. Together with the maximum outside temperature of the section, the Kb value will be calculated. The lowest value for the three sections shall be taken as the Kb value of the whole model box.
Acouctic insulation of casing
ObsoleteExisting
Inside the enclosure, a sound source, designed to prevent vibration to the floor, shall be mounted in the middle of the model box.Inside the enclosure, a sound source, designated to prevent vibration to the floor, shall be resiliently mounted in two successive positions. The average of both measurements will be used for the determination of the sound insertion loss.
General Reference documents


Certification Manual 13th (November 2016)
Reference documents

 


OM-5-2017

 


RS/6/C/005-2017


RS/6/C/011-2016 Hygienic AHU