32
Planning
2596995_0_EN_1905
Nortec RS
The following is a list of installation requirements for duct distributors to ensure steam is properly ab-
sorbed, and condensation does not occur in the ducts:
Steam distribution capacity must be equal to or greater than the humidifier steam production capac-
ity, less steam line condensate losses. Multiple distributors can be utilized, as needed.
Air flow in the duct across the distributor must be laminar over the entire calculated absorption
distance downstream of the distributor. Excessive turbulence may cause air stream collisions with
internal duct walls/components, which must be avoided.
The air velocity in the duct must be greater than 300 ft/min (92 m/min) to prevent steam migrating
to, and colliding with, the duct ceiling.
An air proving switch and high limit humidistat must be installed in the system. Refer to
tion Control Design" on page 43
.
Backpressure in the steam line combined with duct static pressure should not exceed exceed 5.5 in H
2
O
(1.37 kPa), or up to 10 in H
2
O (2.49 kPa) with the optional fill cup extension.
The atmospheric steam lines between the Nortec RS humidifier and the steam distributor must be
installed as described in
"Atmospheric Steam and Condensate Lines" on page 34
.
