DRI-STEEM XT Series Electrode Steam Humidifier Installation, Operation, and Maintenance Manual • Page 37
Steam outlet
Figure 37-1:
XT Steam Blower rise, spread, throw
Steam outlet
Rise
Spread
Throw
Air intake
grille
OM-7424
Air intake
grille
As steam is discharged from the XT Steam blower (XTSB) it quickly
cools and turns to a visible fog that is lighter than air. As this fog is
carried away from the XTSB by the airstream, it tends to rise toward
the ceiling. If this fog contacts solid surfaces (columns, beams,
ceiling, pipes, etc.) before it disappears, it can collect and drip as
water. The greater the space relative humidity, the more the fog will
rise, spread, and throw.
The table below lists the maximum rise, spread, and throw non-
wetting distances for XT Series humidifiers with an XTSB at 40%,
50%, and 60% RH in the space. Surfaces cooler than ambient
temperature, or objects located within this minimum dimension,
can cause condensation and dripping. To avoid steam impingement
on surrounding areas, observe the minimum non-wetting distances
in the table below.
The XTSB-20 contains an 63 cfm (1.8 m
3
/min) blower (115V,
single-phase, 50/60 Hz) and the XTSB-50 contains a 500 cfm
(14.2 m
3
/min) blower (115V, single-phase, 50/60 Hz) field wired to
the XT Series humidifier blower terminals. A wiring diagram of the
XTSB is included with each unit.
On a call for humidity, the humidifier begins producing steam
and the contactor energizes the XTSB blower. When the call for
humidity is satisfied, the contactor opens and the blower is de-
energized.
Table 37-1:
XT Steam Blower minimum non-wetting distances
Model
Maximum
steam
capacity
40% RH @ 70 ºF (21 ºC) 50% RH @ 70 ºF (21 ºC) 60% RH @ 70 ºF (21 ºC)
Rise Spread Throw Rise Spread Throw Rise Spread Throw
lbs/hr kg/h ft m ft m ft m ft m ft m ft m ft m ft m ft m
XT-10 10 4.5 1.5 0.5 2.0 0.6 6.0 1.8 2.0 0.6 2.5 0.8 7.0 2.1 2.5 0.8 3.0 0.9 8.0 2.4
XT-20 20 9.1 2.0 0.6 2.5 0.8 6.5 2.0 2.5 0.8 3.0 0.9 7.5 2.3 3.0 0.9 3.5 1.1 8.5 2.6
XT-30 30 13.6 2.5 0.8 3.0 0.9 7.0 2.1 3.0 0.9 3.5 1.1 8.0 2.4 3.5 1.1 4.0 1.2 9.0 2.7
XT-50 50 22.7 3.0 0.9 3.5 1.1 8.0 2.4 3.5 1.1 4.0 1.2 9.0 2.7 4.0 1.2 4.5 1.4 10.0 3.0
XT-75 75 34.0 3.0 0.9 3.5 1.1 8.0 2.4 3.5 1.1 4.0 1.2 9.0 2.7 4.0 1.2 4.5 1.4 10.0 3.0
XT-100 100 45.4 3.0 0.9 3.5 1.1 8.0 2.4 3.5 1.1 4.0 1.2 9.0 2.7 4.0 1.2 4.5 1.4 10.0 3.0
XT-150 150 68.0 3.0 0.9 3.5 1.1 8.0 2.4 3.5 1.1 4.0 1.2 9.0 2.7 4.0 1.2 4.5 1.4 10.0 3.0
XT-200 200 90.7 3.0 0.9 3.5 1.1 8.0 2.4 3.5 1.1 4.0 1.2 9.0 2.7 4.0 1.2 4.5 1.4 10.0 3.0
Notes:
Rise: Minimum non-wetting height above the steam outlet of the XTSB
Spread: Minimum non-wetting width from the steam outlet of the XTSB
Throw: Minimum non-wetting horizontal distance from the steam outlet of the XTSB
Dispersion: XT Steam Blowers
(continued)
XT_IOM_Jan_2008.pdf 39 11/19/2009 10:13:39 AM
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