Nortec ME Direct Feed Installation - Manual (Page 12)

12 Installation
4.2 Mounting the evaporative module
4.2.1 Notes on positioning the evaporative module
The design and dimensioning of the AHU/air duct as well as the location of the evaporative module
inside the duct are determined, recorded and set compulsory when planning the entire system. Prior to
installation, however, make sure the following criteria have been taken into consideration:
– The AHU/air duct floor must be designed with a loading capacity capable of supporting the evapo-
rative module’s weight. The weight of the evaporative module can be found on the rating plate.
– In the area where the evaporative module is installed the floor of the AHU/air duct must offer a plane
support (lengthwise and crosswise).
– The evaporative module must be installed in a waterproof section of the AHU/air duct.
– Downstream, directly after the evaporative module a drain pan with provision for running water
to waste must be installed. The drain must be connected via a drain trap to the waste water line of
the building. The drain trap must be sufficiently high and must be filled with water prior to commis-
sioning, so that the drain trap is not emptied by the air pressure in the duct. The drain pan and the
drain trap must be accessible for cleaning and disinfection as part of the periodic maintenance of
the system.
– For installation and maintenance sufficiently large access doors before and after the evaporative
module must be available in the AHU/air duct.
– The supply air must be filtered. We recommend to install an air filter with quality standard F7 (EU7)
or better before the evaporative module. If no air filter or an air filter with lower quality is installed an
increased maintenance requirement will result.
– An even air flow over the full cross section of the evaporative module must be guaranteed. If
necessary, rectifiers or perforated plates must be installed.
– The evaporative module must be positioned on upstands (supplied) to allow to install the drain pipe
with a downslope through the side wall of the AHU/air duct.
– In case of low ambient temperature the AHU/air duct must be insulated to prevent the moist air from
condensing inside the duct.
– If the AHU is equipped with a heater, make sure it is at least 600 m (23.6") away from the evaporative
module.
– If the face velocity exceeds 3.5 m/s (689 fpm), the optional droplet separator cassettes must be
installed.
– Appropriate clearance must be available for the hydraulic manifold (and associated plumbing) when
installing externaly.