Page 11 - Air Handling Units.cdr

AIR Handling UNITS

Thermal bridges

Heat leakage bridges of the housing determine the permeability for moisture condensation.
It is described by the heat leakage bridge coefcient kb. Higher kb means lower condensation
permeability of the housing.

Obtained class The requirements of the PN-EN 1886:2007 standards
according to Panel class
PN-EN 1886:2007
Central station T1 T2 T3 T4 T5
Heat leakage bridge coefficient kb
type
KMW KMW 0,75<kb<1,00 0,60<kb<0,75 0,45<kb<0,60 0,30<kb<0,45 no

ZR ZR requirements
climat climat

40 70
TB1-TB2 TB1-TB2

(M)* (M)**
*standard
housings

TB1-TB3 TB1-TB3
(M)** (M)**
**only special
housings, with
double doors

Tightness

Housing tightness is determined by the measurement of leaks from the housing. Two measurements
are performed:
- quantity of leaks in sections which operate under pressure,
- quantity of leaks in sections which operate at over pressure.
Housing class is determined by the leak class coefcient. Higher leak coefcient means lower
class of tightness.

Obtained class

according to The requirements of the PN-EN 1886:2007 standard

PN-EN 1886:2007

Central station type

KMW ZR KMW ZR Maximum leak rate

climat 40 climat 70 f400(-400 Pa), I / (s· m2)
f400(-400 Pa), I / (s· m2) L2
0,44
L1 (M) L1 (M) L1 L3
0,15 f700(+700 Pa), I / (s· m2) 1,32
f700(+700 Pa), I / (s· m2) L2
L1 0,63 L3
L1 (M) L1 (M) 0,22 1,90

fon +48(0)52 569 8000 kmw.pl
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