Herrmidifier Herrmidicool Technical Guide - Manual (Page 11)

Special Applications - Roof Top Air Handlers
In many cases, the air handlers, in which the
Herrmidicool system will be installed, will be located on
the roof of a building, exposed to the weather. In these
cases, it is important to keep freeze protection in mind.
Although the water lines of the system may and should
be heat traced, it is also wise to remove the water from
the system when it is not in use to prevent freezing in a
power failure. Herrmidifier makes available such features
as a freeze-stat interlock and blow-down capability. This
special system drains all water out of the system on
any shut down, whether caused by a power failure,
freeze-stat alarm or normal shut down.
Figure 5 shows a typical roof top installation with the
heads mounted ahead of the cooling coil, in the folds of
the filters.
Because of the cone-shaped discharge pattern from the
Herrmidicool heads, such installations are possible. Note
that the Control Cabinet is mounted below the roofline in
the warm air space of the building. This is recommended
as the system will only clear out the water in the lines
BETWEEN the control section and the atomizing
manifolds. It is also recommended that the air and water
lines be run through the supply or return plenums into
the unit. This keeps the lines warm and prevents their
exposure to outside freezing conditions. As with all
installations, Chart II should be used in laying out this
type of system. Again it is wise to contact Herrmidifier.
HERRMIDICOOL Technical Manual