Humidification


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T


he most common humidifier any HVAC contractor is going to come across is a self- generating, electric steam humidifier. These


will typically provide steam to an air handling unit but are also available for direct room humidification with a fan unit. However, for the sake of this guide, I’m going to focus on AHU humidification, as this is the most common.


Electric steam humidifiers are available with


either resistive or electrode boiler technology. A resistive humidifier heats the water with a kettle- like element, whilst an electrode boiler passes current through the water. The maintenance needs of both types differ substantially but the installation requirements are identical. The main equipment consists of the humidifier itself, which is typically attached to a wall, a length


14 July 2022


How to install a steam humidifier


Tony Tullett, service director at Condair, provides some best practice guidance on humidifier installation


of steam pipe running from the humidifier into the AHU, and finally a steam lance attached to the end of the steam pipe that releases the steam into the duct’s airstream. Associated elements could include


sensors, humidistats, water treatment systems and potentially water pumps and tanks. Firstly, the steam humidifier needs to be located as close to the AHU as possible. This is to maintain


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