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Page 9
2008-10-01
C. CURB MOUNTING
(1) The integral base of the NH Outdoor models is designed to mount on a curb. The
curb must be built to structurally support the entire weight of the humidifier when in
operation. Required curb dimensions are given in Figure 1. Typical curb mounting
installations are shown in Figure 3. Additionally, observe the following precautions
when installing the humidifier:
(a) The NH Outdoor unit is shipped on a skid to allow for lifting by a forklift.
When lifting by this method, ensure that the forks extend across the entire
skid to prevent tipping or damage to the unit.
(b) Ensure that the humidifier is mounted level.
(c) The pan in the bottom of all outdoor models has a pipe chase for routing of
services into the humidifier from below.
(d) If the humidifier will be roof mounted, it is not necessary to make the hole in
the roof the same size as the curb, the curb drawing shows the size and
location of the pipe chase required. The pipe chase should be sealed when
installation is complete to ensure positive or negative pressure from the
building.
(e) When mounting the unit in cold climates, ensure the lowest point of the air
louvers is 12” above any surface when snow or ice could accumulate.
Remove excessive ice and snow as necessary.
(f) Final installation of the humidifier is accomplished by manually lifting the unit
into position on the curb. Ensure that proper lifting techniques are used.
Several people may be required to lift the unit.
(g) The base of the humidifier is predrilled to allow the unit to the screwed to a
curb. Ensure that the unit is securely fastened to the curb in this manner.
(h) Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of the humidifier.
(i) If possible, DO NOT locate humidifier any further than absolutely necessary
from steam distributor location as net output will be reduced as a result of
heat loss through steam line.
D. WALL MOUNTING
(1) A third option for installation involves mounting the humidifier on an exterior wall or
other vertical surface. This method requires holes to be drilled into the wall to
accommodate the steam lines, which exit from the rear of the humidifier. Typical
wall mounting installations are shown in Figure 4. If this method is selected, utilize
the provided brackets in a similar manner as if the installation was on an air
handler. Additionally, observe the following precautions:
(a) Ensure that the surface selected to mount the humidifier is structurally sound
and capable of supporting the entire weight of the humidifier when in
operation.
(b) For minimum required maintenance clearances see Figure 4.