Steam Distributors For Ducted Applications - Nortec GH Series Instaliation, User & Maintenance Manual

STEAM DISTRIBUTORS FOR DUCTED
APPLICATIONS
1. Any humidifier's steam line may be divided
into multiple branches to feed more than one
distributor. Steam supply line "tees" are
common copper fittings that are available for
this purpose.
2. Steam distributor locations are typically as
follows: supply air duct, return air duct, air
handling unit. Proper location should
consider: air temperature, relative humidity
before the distributor, air velocity, dimensions
of the location, amount of steam being
introduced into the duct, downstream
obstructions, and surfaces vulnerable to
wetting.
3. When steam distributors are located in a duct,
they should be in a straight section of duct at
least 6 feet (2 meters) from any elbow or
obstruction. If the duct or plenum conditions
result in poor absorption distance
characteristics, please consult your local
representative or the factory. (See
Engineering Manual, Form # -1630 for
information on absorption distances.) See
Figure #7.
Figure #7
Mount Steam Distributor
At Least 'A' From Elbow
Ideally 'A' Is 6 Feet (2 Meters)
Multiple Steam Distributors
Can Reduce
'N
Distance
(>-
4. Steam distributors should always span the
width of the air stream. Multiple steam
distributors, arranged in a bank, can minimize
absorption distance.
5. Exercise extreme caution when installing in
fiberglass or internally lined ducts. If
necessary, remove 4-6 feet of the lining where
the steam is being introduced.
- 8 -
6. High positive or negative static pressure ducts
or plenums have special requirements. High
positive static pressure duct$ may require the
unit to be fitted with an extended external
water trap.
7. Low temperature ducts below 60°F (15°C),
shallow ducts, or branch ducts might require
the use of a field supplied condensate drain
pan below the steam distributor. See Figure
#8.
Figure #8
Shallow Duct
Drain Pan - -
L-_~
T-Bar Ceiling -----...
To Drain---
Branch Duct
8. The steam distributor mounting plate is
perpendicular to the steam distributor. When
the mounting plate is attached to the side of
the duct, the distributor is level. An upward or
downward slope to the distributor will result in
poor condensate drainage and "spitting" of
condensate in duct. See Figure #9.
Figure #9
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I
WeD,'
Correct
Always Mount Level
Wrong