Table 3 – Steam Humidifier Capacity in Gallons/Day
Steam Hose
or Insulated
Pipe length
120 Volts
208 Volts
240 Volts
Steam Hose
Insulated Pipe
Steam Hose
Insulated Pipe
Steam Hose
Insulated Pipe
< 2 ft .
11 .5
11 .5
20 .5
20 .5
23 .3
23 .3
2 ft .
11
11
20
20
23
23
4 ft .
10
11
19
20
22
23
6 ft .
9
11
18
20
21
22
8 ft .
10
19
22
10 ft .
10
19
22
12 ft .
10
19
22
14 ft .
9
18
21
16 ft .
9
18
21
18 ft .
9
18
21
20 ft .
9
18
20
Distance from Humidifier to Dispersion Tube
The capacity of the humidifier is reduced by the length of the steam hose or pipe due to condensation . The maximum recommended length
of steam hose is 6 feet . Use hard pipe insulated with 1” fiberglass for lengths greater than 6 feet .
Table 3
provides humidifier capacity with
various lengths of steam hose and pipe . If 6-foot steam hose does not reach from humidifier to dispersion tube, splice in 1” copper pipe using
¾” x 1” reducing couplings as shown in
figure 5
.
Pitch
Obstruction
90° long sweep
or two 45° elbows
6" min
8" min
Insulate hard pipe to
reduce steam loss
To
Dispersion
Tube
1" air gap
Open drain
required,
see
note 1
.
Drip tee installation for piping over obstruction,
or if dispersion tube is lower than humidifier.
NOTES:
1. Refer to governing codes for
drain pipe size and materials.
2. Support steam hose so there
are no sags or low spots.
Drip tee
Drain trap
fIGURe 4 – Dispersion Tube Mounted below Humidifier
90-1703
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
. If the dispersion tube must be mounted below the
humidifier or if the steam hose needs to run up and over an obstruction, a drip tee with drain trap, must be installed as shown in
figure 4
.
fIGURe 3 – Dispersion Tube Mounted above Humidifier
90-1704
90° long sweep
or two 45° elbows
Pitch*
Duct
Dispersion tube
Steam hose or pipe.
Insulate pipe with
1” fiberglass to
reduce steam loss.
*Pitch steam hose down from dispersion tube to humidifier:
2"/ft (15%) minimum when using steam hose.
1/4"/ft when using hard pipe.
InSTallaTIon InSTRUCTIonS
(ConTInUeD)
6
