Herricane CS
®
Series
A p p l i c a t i o n G u i d e
6
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SECTION II SYSTEM OVERVIEW
Installation Guidelines
Steam absorption distance for a system is defined in terms of “bulk” and “last wisp”. “Bulk” evaporative distance is the distance
beyond which condensation will not occur on objects at duct temperature. “Last Wisp” evaporation is the point beyond which
there is no visible steam and it is safe to install high-efficiency filters.
Installation:
1.
The first choice for an installation location would be a point where there is sufficient straight run to allow for a “last wisp”
evaporation.
2.
The second choice would be to locate the system in front of the cooling coil when there is sufficient “bulk” evaporation
distance in front of the cooling coil. Since the cooling coil typically has a drain pan, the coil can act as a moisture elimi
-
nator in case something should go awry with the total system control.
3.
The area prior to the fan or heating coil would be the next choice if sufficient “bulk” evaporation distance is present. If
the heating coil is “on” during periods of humidification, the extra heat would help minimize evaporation distance.
4.
Locating the system in the mixed air box would be poor choice due to the potential for cold temperature and turbulent
airflow, which would lead to creation of wetted areas.
5.
Allow six inches of upstream clearance for ease of installation and accessibility. If the upstream object is causing turbu
-
lence, additional clearance may be required.
6.
Safing is not required for most installation. Safing is best avoided since it adds uncontrollable turbulence to the airflow,
which can cause surfaces to become wet and or extend the evaporative distance.
