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Humidifiers | System Design Consideration
LOCATING THE HUMIDIFIER
Locate the humidifier cabinet level and plumb on a
surface as close to the steam distributor as possible at a
convenient height for servicing. Allow 1" or more on the
sides for ventilation and 16" from the bottom of the unit to
the floor to allow for drain connections. Allow 14" in front
of cabinet for door opening (Figure B).
The humidifier must never be located outside or where
it may be exposed to freezing temperatures unless a
heated, ventilated weatherproof enclosure by others is
provided. Do not mount humidifiers on a hot or vibrating
surface.
STEAM DISTRIBUTOR PIPE LOCATION
Each steam cylinder requires a separate distributor
pipe, steam hose and condensate return line. A cylinder
may supply more than one distributor pipe by using an
accessory "T" fitting but the output cannot be controlled
separately. In a typical installation the humidifier is
located below the duct as shown in Figure B. The
distance between the humidifier cabinet and the steam
distributor should be the minimum distance possible.
Refer to Table 5 for maximum length that may be
installed, based on static pressure to provide the most
effective and efficient humidification.
Figure B
MAXIMUM STEAM HOSE LENGTH
Table 5
Duct Static
0
Pressure "w.g."
Maximum Steam
40
Hose Length (Ft.)
G-10
1
2
3
4
5
35
30
25
15
10
The maximum length of steam hose that may be installed
as shown in Figure B is 12 feet. For steam hose lengths
over 12 feet refer to Figure C. A drain "T" must be used to
remove condensation that occurs in steam hose lengths
over 12 feet. It is preferable to have the steam hose rise
vertically from the cabinet and then slope downward
to the distributor pipe as shown. If sufficient headroom
is not available it is possible to install with an upward
slope but the rise should be 2" in 12" to allow proper
condensate drainage and steam flow.
Figure C
In a vertical duct with either upward or downward
air flow the distributor pipe should be installed
horizontally (Figure D), with output holes up.
Figure D
If multiple pipes are used they should be staggered as
shown (Figure E).
Figure E
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