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4.
Minimize the length of steam line and keep it
as straight as possible, minimizing bends.
Avoid using 90° elbows. Wherever possible,
use long radius turns (using tube bender on
oversized copper or pairs of 45° elbows). This
will reduce the condensate generated by heat
loss. This will also reduce the back pressure
and avoid the need to install an extended
water trap.
5.
Ensure that the steam hose does not kink or
sag. The steam hose becomes more flexible
when hot. The hose should be supported to
prevent water traps. Only use steam hose for
connections or steam line runs of
5
feet or
less. See Figure
#21 .
Figure #21
6.
To ensure odor-free steam, always use
NORTEC steam hose. Check steam hose
and hose couplings periodically for cracks,
breaks, kinks. Replace as required. DO NOT
substitute hose. NORTEC is not responsible
for health effects or damage from substitute
hose.
7.
Steam lines require
1-5/8"
0.0. (nominal
1-1/2")
copper pipe. F-or steam runs longer
than
40
feet use insulated nominal 2" copper
to ensure the draining of condensate.
8.
Do not use steel or plastic pipe for steam
distribution or hose other than NORTEC
supplied. Substitution will void warranty.
9.
If steam line is routed below steam distributor
or if the steam distributor is lower than the
humidifier, a condensate trap "tee" will be
required to remove water at this low point.
Run condensate from trap to nearest drain
lower than the distributor. See Figure #22.
10.
Do not run steam line more than ' 1 foot per
Ib/hr output. Example,
10
Ibs/hr should not
have a steam run longer than
10
feet. If long
runs are unavoidable. the humidifier should be
sized larger to compensate for condensate
- 14 -
Figure #22
er ...
AF .... Lew Poinl10
R_~
Wh _ _
n.
Steam
Un .......
Al'f)roac:ft
The
o..,buDf From
Abo ... ,
losses and insulated copper should definitely
be used.
NOTE FOR OUTDOOR ENCLOSURE: It is
recommended to insulate steam lines between
the enclosure and the building or air handling
unit specifically if freezing conditions may
occur.
WATER TRAP
1.
The GH Series humidifier produces steam at
atmospheric pressure. Pressure head must
develop to push steam through supply line and
into air duct.
2.
Combined resistance of duct positive static
pressure and steam line resistance creates a
small pressure head in water tank. Total
amount of positive static pressure head is
reflected directly by water column differential
that develops in the built in water trap.
3.
The built in water trap allows a maximum of
12" W.C. pressure before steam escapes
through drain. This pressure should not be
exceeded ..
4.
Static pressure is usually higher when
distributor's steam outlets are faced into
downflow duct applications.
CONDENSATE RETURN LINES FOR STEAM
DISTRIBUTORS
1.
Nortec steam distributors and blower packs
have built-in connections for draining off
condensate. These condensate lines must be
connected to the nearest floor drain or to a
condensate pump (available from NORTEC).
A flexible condensate hose, (available from
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