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INSTALLATION INSTRUCTIONS
Each humidifier requires its own steam hose and dispersion tube. Do not connect steam hoses from more than one humidifier
together. Back-pressure from one humidifier can lower the water level in the canister in the other humidifier and cause
operational problems.
Do not install the dispersion tube in a duct with greater than 2 in. wg static pressure. High duct pressure can cause back-
pressure in the canister which can result in unstable unit operation.
TABLE 3 – Absorption Distance (Minimum distance from dispersion tube downstream to any obstruction or bend in duct)
Humidifier
Airflow Velocity*
Output (gal/day)
300 fpm
600 fpm
Up to 16 .0
1200 fpm
1800 fpm
300 fpm
600 fpm
20 .5 – 25 .0
1200 fpm
1800 fpm
300 fpm
600 fpm
25 .0 – 35 .0
1200 fpm
1800 fpm
*Velocity in feet per minute = Duct airflow volume in cubic feet per minute / duct area in square feet .
Example: 1,200 cfm through 16" x 12" duct = 1,200/(12 x 16/144 sq . in ./sq ft .) = 1,200/1 .333 = 900 fpm
ELEVATION
The preferred location for the dispersion tube is higher than the
humidifier so that the steam hose has a constant downward slope of at
least 2" per foot from the dispersion tube to the humidifier . If hard pipe
is used, the slope can be 1/4" per foot . With the constant downward
slope, any condensation that forms in the steam hose will drain back
into the steam canister . See Figure 3 .
8
(CONTINUED)
CAUTION
70°F & 30% RH
70°F & 45% RH
Setpoint
Setpoint
13"
6"
3"
2"
15"
6"
5"
3"
24"
17"
12"
10"
Insulate pipe with 1" fiberglass
65°F & 45% RH
Setpoint
19"
23"
10"
12"
5"
6"
3"
4"
23"
28"
12"
13"
6"
7"
4"
5"
31"
36"
22"
26"
15"
18"
13"
15"
FIGURE 3 – Dispersion Tube Mounted Above Humidifier
Steam hose or pipe.
to reduce steam loss.
90° long sweep
or two 45° elbows
45°F & 45% RH
Setpoint
30"
18"
13"
10"
45"
26"
19"
16"
60"
48"
25"
20"
5" minimum
Duct
Dispersion
tube
* Pitch steam hose down
from dispersion tube to
humidifier:
2"/ft (15%) minimum
when using steam hose.
1/4"/ft when using
hard pipe.
90-1704
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