5
Location & Mounting
Location
The location selected must provide for electrical
service, cold or hot water supply, and sanitary drain.
When selecting a location, try to keep the humidifier
within 10 feet (305 cm) of the duct to avoid
unnecessary heat losses and condensation within
the steam supply line.
Visible “fog” will saturate and condense when it
contacts objects such as turning vanes, filters, fans,
elbows or take-offs. The warmer the air, the more
easily it will dissipate the visible steam. The most
active and warmest portion of the duct will provide
better mixing of the steam and air. The injection
tube should be mounted a minimum of 2 feet (61
cm) downstream from an elbow or other turbulent
air flow area.
Avoid mounting single style injection tube(s) closer
than 8-10 feet (244-305 cm) upstream of objects
that could become saturated and condense the
steam (reference the paragraph above). If the duct
layout does not provide a straight unobstructed run
of 8-10 feet (244-305 cm), a multiple injection tube
system should be considered to reduce the visible
steam travel distance.
For Fast-Pac and Insty-Pac multiple tube
assemblies please consult factory for job specific
non-wetting distances.
Reference Fast-Pac or Insty-Pac O&M’s for full
installation details.
CAUTION: Do not humidify upstream of filters.
Consult factory.
CAUTION: Smoke alarms should not be located
downstream of injection tube assemblies.
Location of Controls
It is important to avoid mounting any controls within
the visible steam. The controls should be mounted
a minimum of 8-10 feet (244-305 cm) downstream
from the humidifier injection tube. Due to the
temperature rise that exists within the visible steam
dissipation area, thermostats should not be
mounted near the injection tube.
High-limit humidistats should be installed before any
duct obstruction to make sure the humidifier is
interrupted before saturation can occur on the
object. The high-limit should be mounted a
minimum of 8-10 feet (244-305 cm) downstream
from the injection tube. Installing the high-limit
closer than 8 feet (244 cm) from the humidifier may
cause erratic control.
Mounting
The humidifier should be mounted dead level in
both directions. PURE Humidifier Co. recommends
that the humidifier be mounted using one of the
following two methods (ref. page 10):
1. Mounted on the wall. PURE Humidifier Co.
offers wall-mounting brackets as an option.
The wall bracket installation sheet should be
followed when installing the brackets. Not
recommended for SX-4R, 8R, or 12R
humidifiers.
2. Mounted off the floor with floor legs. PURE
Humidifier Co. offers floor support legs as an
option. The humidifier is mounted 24” (61 cm)
up from the floor. Simple floor legs can be
constructed from 1-1/4” x 1-1/4” x 1/4” angle
iron. The support legs should be secured to the
humidifier side mounting holes.
Drain Pan Mounting
A drain pan is an additional safety feature which
may be required to be supplied in the field. In a
proper humidifier installation, a drain pan is not
required. However, if the humidifier and injection
tube are located in an area that contains valuable
equipment or is a water sensitive area, PURE
Humidifier Co. recommends the addition of a drain
pan under the humidifier and under the injection
tube. The drain pan should extend past all edges of
the humidifier and if installed in the duct, it should
extend a minimum of 3 feet (91 cm) downstream
from the injection tube. The pan should be of a size
which is sufficient to retain sudden drainage of the
humidifier’s contents. The pan should be drained to
a sanitary drain.
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