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Page 19
2008-12-03
1.2 UNIT MOUNTING
1.2.1. Note on the locating the unit
Usually, the design and dimensioning of the ventilation duct/air handler as well as the location
of the Nortec MH inside the duct are determined, recorded and specified when planning the
entire system. Prior to installation, however, make sure the following criteria have been taken
into consideration:
• For operation with fully demineralised water: Fully demineralised water is aggressive! For
this reason, all components located close to the humidification unit (duct/ air handler,
fastening material, drain pipe, etc.) must be made of corrosion-proof steel or plastic.
• For installation and maintenance of the humidification unit a viewing window and a
sufficiently large maintenance door must be available in the duct/ air handler.
• In the area of the humidification unit the ventilation duct/ air handler must be waterproof.
• Important! An air filter must be installed at the air inlet of the humidification unit. The filter
must meet the quality standards (MERV 11 (Note WMCI specifies EU7 (f7) which is
equivalent to MERV 11) ASHRAE 52.2 or better.
• In case of low ambient temperature the duct must be insulated to prevent the moist air from
condensing inside the duct.
• If the system is equipped with a heater, make sure it is at least 20” (0.5 m) away from the
humidification unit.
• If silencers are mounted in the air conditioning units make sure to locate the humidification
unit at a minimum distance of 10’ (3 m) before or after the silencers.
• In order to avoid drops seeping over the humidification boxes, an even air flow over the full
cross section of the humidification unit must be guaranteed. If necessary, rectifiers or
perforated plates must be installed on the building side before the humidifier. If the air
velocity through the humidification boxes exceeds 750 fpm (3.8 m/s), mist eliminator must
be installed.
• The effective height of the siphon in the drain line depends on the duct pressure. Correct
dimensioning of the siphon is the customer’s responsibility.