Specifications

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Table 21-1:
SDU-E minimum non-wetting distances
Model
40% RH @ 70 °F (21 °C) 50% RH @ 70 °F (21 °C) 60% RH @ 70 °F (21 °C)
Rise Throw Spread Rise Throw Spread Rise Throw Spread
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VM-2 1.0 0.3 5.0 1.5 1.0 0.3 1.5 0.5 6.5 2.0 1.5 0.5 2.5 0.8 7.5 2.3 2.5 0.8
VM-4 1.0 0.3 5.0 1.5 1.0 0.3 1.5 0.5 6.5 2.0 1.5 0.5 2.5 0.8 7.5 2.3 2.5 0.8
VM-6 1.0 0.3 5.0 1.5 1.0 0.3 1.5 0.5 6.5 2.0 1.5 0.5 2.5 0.8 7.5 2.3 2.5 0.8
VM-8 1.0 0.3 5.5 1.7 1.0 0.3 1.5 0.5 6.5 2.0 1.5 0.5 2.5 0.8 7.5 2.3 2.5 0.8
VM-10 1.5 0.5 6.0 1.8 1.5 0.5 2.0 0.6 7.0 2.1 2.0 0.6 3.0 1.0 8.0 2.5 3.0 1.0
VM-12 1.5 0.5 6.0 1.8 1.5 0.5 2.0 0.6 7.0 2.1 2.0 0.6 3.0 1.0 8.0 2.5 3.0 1.0
VM-14 2.0 0.6 7.0 2.1 2.0 0.6 2.0 0.6 7.0 2.1 2.0 0.6 3.0 1.0 9.0 2.7 3.0 1.0
VM-16 2.0 0.6 7.0 2.1 2.0 0.6 2.0 0.6 7.0 2.1 2.0 0.6 3.0 1.0 9.0 2.7 3.0 1.0
VM-21 2.0 0.6 7.5 2.3 2.0 0.6 2.5 0.8 10.0 3.0 2.5 0.8 3.0 1.0 12.0 3.7 3.0 1.0
VM-25 2.0 0.6 8.0 2.5 2.0 0.6 2.5 0.8 10.5 3.2 2.5 0.8 3.5 1.1 12.5 3.8 3.5 1.1
VM-30 2.0 0.6 8.0 2.5 2.0 0.6 2.5 0.8 10.5 3.2 2.5 0.8 3.5 1.1 12.5 3.8 3.5 1.1
VM-34 2.0 0.6 8.0 2.5 2.0 0.6 2.5 0.8 10.5 3.2 2.5 0.8 3.5 1.1 12.5 3.8 3.5 1.1
Notes:
Rise: Minimum non-wetting height above the steam outlet of the SDU-E
Throw: Minimum non-wetting horizontal distance from the steam outlet of the SDU-E.
Spread: Minimum non-wetting width from the steam outlet of the SDU-E.
As steam is discharged from the SDU-E, it quickly cools and turns
to a visible fog that is lighter than air. As this fog is carried away
from the SDU-E 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 could collect and drip as water. The
greater the space relative humidity, the more the fog will rise, throw
and spread.
The table below lists the minimum rise, throw and spread non-
wetting distances for SDU-E area-type humidifiers 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 SDU-E contains a 545 cfm (0.26 m
3
/s) blower (120 V, single-
phase, 60 Hz) and an airflow proving switch field-wired to the
Vapormist humidifier electrical panel. A wiring diagram of the
SDU-E is included with the unit.
On a call for humidity, the humidifier begins producing steam
and the start relay energizes the SDU-E blower. When the call for
humidity is satisfied, the Vapor-logic
3 microprocessor keeps the
blower running to disperse residual moisture using a time delay.
Figure 21-1:
SDU-E: Rise, throw and spread
Steam outlet
Throw
Spread
Air intake
grille
DC-1027
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Rise
VM-IOM-1108.pdf 23 4/21/2010 1:36:21 PM