8
AREA-TYPE APPLICATION USING SPACE DISTRIBUTION UNITS
Space distribution units (SDUs) convert a
VAPORMIST
®
duct humidifier into an area-type
humidifier. Instead of the steam dispersion tube being
located inside an air duct, the dispersion tube is built
into a fan unit. A fan draws in room air and blows it
across the dispersion tube, where it disperses moisture
into the room. There are two types of SDUs: SDU-E
(external), which can be used with all VAPORMIST
models, and SDU-I (internal), which can be used on
models VM-2 through VM-10.
Mounting the SDU
The SDU may be mounted on a wall above the
VAPORMIST cabinet or mounted on a wall remote from
the VAPORMIST. Use the mounting template on the box
for correct placement. Two 3/8" lag bolts are provided
with each fan unit. (See Page 4 for mounting instructions.)
Rise, throw and spread (SDU-E)
As steam is discharged from the humidifier, it quickly
cools and turns to a visible fog that is lighter than air.
As this fog is carried away from the humidifier by the
airstream, it tends to rise toward the ceiling. If this fog
Table 8-1: SDU-E visible vapor travel
Table 8-1 notes:
Table 8-1 states the vertical (rise), horizontal (throw) and
width (spread) dimensions that can be expected with the
VAPORMIST with SDU-E.
Surfaces cooler than ambient temperature, or objects
directly in the path of visible vapor discharge, may cause
condensation and dripping.
Rise:
Maximum height visible vapor rises above the
discharge grill of the SDU-E.
Throw:
Maximum horizontal distance visible vapor travels
from the discharge grill of the SDU-E.
Spread:
Maximum width visible vapor spreads out from the
discharge grill of the SDU-E.
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 before disappearing. The dis-
tances the fog travels before it disappears are given in
Table 8-1.
Table 8-1 lists the recommended minimum vertical (rise),
horizontal (throw) and width (spread) clearances for SDU-E
area-type humidifiers at 40%, 50% and 60% RH in the space.
The SDU-E contains a 545 cfm blower (120V/1ø/60 Hz)
and an air flow 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 will begin producing
steam and the start relay will energize the SDU blower. Time-
delay is controlled by the VAPOR-LOGIC
®
3
microprocessor.
OM-56-1
If necessary, the fan unit can be
mounted on a wall, allowing the
VAPORMIST to be remotely located.
This optional fan unit can be mounted
on a wall directly above the VAPORMIST
cabinet (SDU-E).
OM-55-1
Air intake
vents
Air discharge
vent
Humidifier
size
40% RH@ 70°F
50% RH@ 70°F
60% RH@ 70°F
Rise
(ft/m)
Throw
(ft/m)
Spread
(ft/m)
Rise
(ft/m)
Throw
(ft/m)
Spread
(ft/m)
Rise
(ft/m)
Throw
(ft/m)
Spread
(ft/m)
VM-4
1.0 / .30
5.0 / 1.5
1.0 / .30
1.5 / .50
6.5 / 2.0
1.5 / .50
2.5 / .80
7.5 / 2.3
2.5 / .80
VM-6
1.0 / .30
5.0 / 1.5
1.0 / .30
1.5 / .50
6.5 / 2.0
1.5 / .50
2.5 / .80
7.5 / 2.3
2.5 / .80
VM-8
1.0 / .30
5.5 / 1.7
1.0 / .30
1.5 / .50
6.5 / 2.0
1.5 / .50
2.5 / .80
7.5 / 2.3
2.5 / .80
VM-10
1.5 / .50
6.0 / 1.8
1.5 / .50
2.0 / .60
7.0 / 2.1
2.0 / .60
3.0 / 1.0
8.0 / 2.5
3.0 / 1.0
VM-12
1.5 / .50
6.0 / 1.8
1.5 / .50
2.0 / .60
7.0 / 2.1
2.0 / .60
3.0 / 1.0
8.0 / 2.5
3.0 / 1.0
VM-16
2.0 / .60
7.0 / 2.1
2.0 / .60
2.5 / .60
7.0 / 2.1
2.5 / .60
3.0 / 1.0
9.0 / 2.7
3.0 / 1.0
VM-21
2.0 / .60
7.5 / 2.3
2.0 / .60
2.5 / .60
10 / 3.0
2.5 / .60
3.0 / 1.0
12.0 / 3.7
3.0 / 1.0
VM-25
2.0 / .60
8.0 / 2.5
2.0 / .60
2.5 / .80
10.5 / 3.2
2.5 / .80
3.5 / 1.1
12.5 / 3.8
3.5 / 1.1
VM-30
2.0 / .60
8.0 / 2.5
2.0 / .60
2.5 / .80
10.5 / 3.2
2.5 / .80
3.5 / 1.1
12.5 / 3.8
3.5 / 1.1
VM-34
2.0 / .60
8.0 / 2.5
2.0 / .60
2.5 / .80
10.5 / 3.2
2.5 / .80
3.5 / 1.1
12.5 / 3.8
3.5 / 1.1
VMOM-0600.PDF 8
11/19/2009 9:59:11 AM
