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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

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

90-1520

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

90-1521

90° long sweep

or two 45° elbows

Steam hose or pipe.

Insulate pipe with

1” fiberglass to

reduce steam loss.

Pitch*

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.

INSTALLATION INSTRUCTIONS (CONTINUED)

1 2 3 4 5 6 7 8 9 10 11 ... 31 32

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