VAPORSTREAM VLC User manual

READ AND SAVE THESE INSTRUCTIONS
VAPORSTREAM
Models VLC and VLDI
ELECTRIC STEAM HUMIDIFIERS
Installation Instructions
and
Maintenance Operations
Manual
®

2
TO THE PURCHASER AND THE INSTALLER
Thank you for purchasing VAPORSTREAM®Model VLC equipment. We have designed and built this equipment to
give you total satisfaction and many years of trouble-free service. Proper installation and operating practices will
assure you of achieving that objective. We therefore urge you to become familiar with the contents of this manual.
This manual covers material for both VAPORSTREAM Model VLC and VAPORSTREAM Model VLDI humidifiers. Most
of the application material will apply to both units. When information differs for the two units, it will be noted as such.
DRI-STEEM Humidifier Company
VAPORSTREAM Models VLC and VLDI ............................ 3
Mechanical Specifications and Capacities ...................... 4
Mechanical Specifications ................................................ 5
VAPORSTREAM Model VLC AREA-TYPE Humidifier ..... 6
Mounting Methods
Mounting Procedures .................................................................. 7
Electrical ...................................................................................... 8
Dispersion Tube Installation ............................................. 9
Optional Weather Cover .................................................. 11
Weather Cover Dimensions....................................................... 12
RAPID-SORB®Assembly and Installation
Horizontal Duct Installation ....................................................... 13
Vertical Duct Installation ........................................................... 14
Piping Methods
Drain Piping ............................................................................... 15
Make-up Water Piping ............................................................... 15
Piping Diagrams: Steam, Water and Drain .................... 16
Start-up Procedure ........................................................ 17
Operation ........................................................................ 17
Recommended Maintenance ......................................... 18
Trouble-Shooting Guide ............................................... 18
Replacement Parts .......................................................... 19
Maintenance Service Record .......................................... 21
Two-Year Limited Warranty .......................................... 23
TABLE OF CONTENTS

3
VAPORSTREAM®MODELS VLC AND VLDI
VAPORSTREAM VLC
Electric Humidifier
State-of-the-art technology in a simple,
low-maintenance humidifier.
This humidifier is designed to
be used with either softened or
unsoftened water (preferably soft-
ened). The probe-type level control
system requires water conductivity
of 100 µs/cm minimum to function,
and therefore will not operate on
water treated by reverse osmosis
or deionization. However, VAPOR-
STREAM®Model VLC humidifiers
are available for use with these
water types. The standard humidi-
fier can be converted in the field to
a VLDI model. See below.
VAPORSTREAM VLDI
Option
For use with deionized or reverse osmosis
water. This unit produces chemical-free
steam and reliable, accurate humidification
control. It is virtually maintenance-free with
no wasted water, no wasted heat, and very
little or no downtime.
OM-628
Control Cabinet
Probes
VAPOR-LOGIC®
Raised Heater
Dispersion Tube
Duct
Cover
Cover Knobs
Evaporating Chamber
Skimmer Port Outlet
Fill Valve
Needle Valve
Manual or Electric
Drain Valve
Clean-out Tray
Thermal Cut-Out
OM-1000
Cover Knobs
Cover
Overflow
Float Valve
Low-Water Cut-Off
DN 20 (¾”) Drain Valve

4
MECHANICAL SPECIFICATIONS AND CAPACITIES
Capacity Notes
Approximately 400 kJ are required to raise the temperature of 0.5
Kg of water from 4° to 100°C. An additional 2250 kJ are required to
change 0.5 Kg of water to water vapor.
The addition of 25 mm rigid foil faced fiberglass insulation (optional)
on all surfaces of evaporating chamber will increase unit efficiency
by approximately 2%.
Another factor to consider is condensation steam loss from hoses
and tubes. Use the following steam loss guidelines:
• vapor hose: 223 g/m/h
• insulated pipe: 74 g/m/h
• dispersion tubes: 744 g/m/h
Table 4-1: Mechanical Specifications and Capacities
* Heater stage identifies the number of contactors.
** Three-phase power supply connection. All heater loads are wired delta.
Model
number
Steam
capacities
per hour Heaters
Current draw (amps) (A)
kW
Kg.
Single-phase Three-phase**
Qty. Stages* 120V 208V 240V 480V 600V 208V 240V 480V 600V
VLC/VLDI 2-1 2.6 1 1 16.7 9.6 8.3 4.2 3.3 2
3-1 4.0 1 1 25.0 14.4 12.5 6.3 5.0 3
4-1 5.2 1 1 33.3 19.2 16.7 8.3 6.7 4
5-1 6.9 1 1 25.6 22.2 11.1 8.9 5.33
VLC/VLDI 6-1 7.8 3 1 28.8 25.0 12.5 10.0 16.7 14.4 7.2 5.8 6
9-1 11.7 3 1 43.3 37.5 18.8 15.0 25.0 21.7 10.8 8.7 9
12-1 15.5 3 1 25.0 20.0 33.3 28.9 14.4 11.5 12
16-1 20.7 3 1 33.3 26.7 44.4 38.5 19.2 15.4 16
21-1 27.2 3 1 43.8 35.0 25.3 20.2 21
25-1 32.3 3 1 41.7 30.1 24.1 25
VLC/VLDI 12-2 15.5 6 2 57.7 50.0 25.0 20.0 33.3 28.9 14.4 11.5 12
18-2 23.3 6 2 86.5 75.0 37.5 30.0 50.0 43.3 21.7 17.3 18
24-2 31.0 6 2 50.0 40.0 66.6 57.7 28.9 23.1 24
32-2 41.4 6 2 66.7 53.3 88.8 77.0 38.5 30.8 32
42-2 54.3 6 2 87.5 70.0 50.5 40.4 42
50-2 64.6 6 2 83.3 60.1 48.1 50
VLC/VLDI 18-3 23.3 9 3 86.5 75.0 37.5 30.0 50.0 43.3 21.7 17.3 18
27-3 35.0 9 3 129.8 112.5 56.3 45.0 74.9 65.0 32.5 26.0 27
36-3 46.5 9 3 75.0 60.0 99.9 86.6 43.3 34.6 36
48-3 62.1 9 3 100.0 80.0 133.2 115.5 57.7 46.2 48
63-3 81.5 9 3 131.3 105.0 75.8 60.6 63
75-3 97.0 9 3 125.0 90.2 72.2 75
VLC/VLDI 24-4 31.0 12 4 115.4 100.0 50.0 40.0 66.6 57.7 28.9 23.1 24
36-4 46.5 12 4 173.1 150.0 75.0 60.0 99.9 86.6 43.3 34.6 36
48-4 62.1 12 4 100.0 80.0 133.2 115.5 57.7 46.2 48
64-4 82.7 12 4 133.3 106.7 177.6 154.0 77.0 61.6 64
84-4 108.7 12 4 175.0 140.0 101.0 80.8 84
100-4 129.3 12 4 166.7 120.3 96.2 100

5
MECHANICAL SPECIFICATIONS
Figure 5-1: Dimensions
B
Back View
A
OM-626
Front View
Side View
C
Table 5-2: Control Cabinet Dimensions
* In addition to the shipping weight of the humidifier.
Table 5-1: Mechanical Specifications
* Refer to table 5-2 for Control Cabinet dimensions
Model
Number
A (width) B (height) C (length) Weight
empty
(kg)
Weight
full
(kg)
Control
cabinet
sizes*
mm mm mm
VLC/VLDI 2-1 515 430 190 16 36 M
3-1 515 430 190 16 36 M
4-1 515 430 190 16 36 M
5-1 515 430 190 16 36 M
VLC/VLDI 6-1 560 465 325 26 71 M
9-1 560 465 325 26 71 M
12-1 560 465 325 26 71 M
16-1 560 465 325 26 71 M
21-1 560 465 325 26 71 M
25-1 560 465 325 26 71 M
VLC/VLDI 12-2 560 465 515 36 108 M
18-2 560 465 515 36 108 M
24-2 560 465 515 36 108 M
32-2 560 465 515 36 108 M
42-2 560 465 515 36 108 M
50-2 560 465 515 36 108 M
VLC/VLDI 18-3 560 465 705 50 148 L
27-3 560 465 705 50 148 L
36-3 560 465 705 50 148 L
48-3 560 465 705 50 148 L
63-3 560 465 705 50 148 L
75-3 560 465 705 50 148 L
VLC/VLDI 24-4 560 465 900 70 194 XL
36-4 560 465 900 70 194 XL
48-4 560 465 900 70 194 XL
64-4 560 465 900 70 194 XL
84-4 560 465 900 70 194 XL
100-4 560 465 900 70 194 XL
Size mm Shipping weight*
M 355 w x 400 h x 150d 15 kg
L 500 w x 500 h x 180d 25 kg
XL 600w x 600h x 1180d 33 kg

6
VAPORSTREAM®MODEL VLC AREA-TYPE HUMIDIFIER
AREA-TYPE Humidifier Application
Information
The operating characteristics of AREA-TYPE steam humidifiers
should be considered when selecting humidifier capacities and
choosing mounting locations.
Steam discharge from the humidifier quickly cools and turns to vis-
ible, warm, microscopic drops or particles of water (fog) which are
lighter than air.
Should this fog contact any solid surface (columns, beams, ceiling,
pipes, etc.) before it disappears, it may collect and drip, as water.
The greater the space relative humidity, the higher and farther the
“fog” will carry and rise in the space before disappearing.
The table at right states the vertical (rise), horizontal (throw), and
width (spread) dimensions that can be expected with the AREA-
TYPE humidifiers.
To avoid steam impingement on surrounding areas, these dimen-
sions should be observed.
Note: Tank dimension “C,” in figure 5-1 on page 5,
must be at least 325 mm and output should not
exceed 130 Kg/h.
Table: 6-1: Minimum Distance for Rise, Spread and Throw
Figure 6-1: Principle of Operation
Steam created in the evaporating chamber (1) flows up through the
chute (2), and is distributed into the space (3) via the fan.
OM-681
Heaters

Steam
Chute 

Fan
Space
temp.
Space
RH
20
kg/h
45
kg/h
65
kg/h
90
kg/h
110
kg/h
130
kg/h
16° C
30%
Rise 0.5 m 1.5 m 2.0 m 2.5 m 2.5 m 3.0 m
Spread 1.0 m 1.5 m 2.0 m 2.5 m 2.5 m 3.0 m
Throw 2.0 m 3.0 m 4.0 m 4.0 m 5.0 m 5.5 m
40%
Rise 0.5 m 1.5 m 2.0 m 2.5 m 3.0 m 3.0 m
Spread 1.0 m 1.5 m 2.0 m 2.5 m 3.0 m 3.0 m
Throw 2.0 m 3.0 m 4.0 m 4.5 m 5.0 m 5.5 m
50%
Rise 0.5 m 1.5 m 2.0 m 2.5 m 3.0 m 3.0 m
Spread 1.0 m 2.0 m 2.0 m 2.5 m 3.0 m 3.0 m
Throw 2.0 m 3.0 m 4.0 m 4.5 m 5.0 m 5.5 m
21° C
30%
Rise 0.5 m 1.0 m 1.5 m 2.0 m 2.0 m 2.5 m
Spread 0.5 m 1.0 m 1.5 m 2.0 m 2.0 m 2.5 m
Throw 1.5 m 2.5 m 3.0 m 3.5 m 4.0 m 4.5 m
40%
Rise 0.5 m 1.0 m 1.5 m 2.0 m 2.0 m 2.5 m
Spread 1.0 m 1.0 m 1.5 m 2.0 m 2.0 m 2.5 m
Throw 1.5 m 2.5 m 3.5 m 4.0 m 4.0 m 5.0 m
50%
Rise 0.5 m 1.0 m 1.5 m 2.0 m 2.0 m 2.5 m
Spread 1.0 m 1.0 m 1.5 m 2.0 m 2.0 m 2.5 m
Throw 1.5 m 2.5 m 3.5 m 4.0 m 4.5 m 5.0 m

7
Mounting Procedures
For proper operation of the electrode probe water level control and
the skimmer system, the humidifier must be mounted level in both
directions.
Access, 460 mm minimum, for periodic removal of the top cover is
recommended. The cover is removed for inspection and cleaning
of the evaporating chamber. In most cases, scale that forms on the
heating elements continuously flakes off as it forms and the loose
scale settles to the bottom. A clean-out tray on the floor of the tank
MOUNTING METHODS
may be removed periodically through the front clean-out opening.
Allow space for withdrawal of the tray when installing the humidifier.
In some installations, an overflow drain pan may be necessary to
prevent possible damage to flooring. This may be caused by a rapid
or sudden drainage of the contents of the humidifier. The drain pan
must be connected to the sanitary waste water system.
Figure 7-1: VLC Mounting Methods
1. Floor Stand Method 2. Trapeze Hanger Method 3. Wall Brackets Method
4. Mounting Unit Below Duct
Mounting humidifier 460 mm below duct is
recommended to facilitate cover removal.
OM-648
630 mm
DRI-STEEM
wall brackets
(optional)
2 required
A
Secure rods to over-
head construction
Angle or channel
of size required
OM-647
Threaded rod of
size required
Cleanout
Steam Dispersion
Tube
Provide 460 mm min.
clearance under duct for
cover removal
DRI-STEEM sup-
port legs (optional)
OM-646
Two-piece Escutcheon Plate
fastens to bottom of duct
(duct omitted for clarity)
Cover of VAPORSTREAM®
Humidifier
OM-65
Clamp
Vapor Hose
Bottom of Duct
2 piece Escutcheon Plate
Cover of VAPORSTREAM
Humidifier
460 mm
Cut hole in duct large
enough to allow pas-
sage of hose clamp
OM-66
Steam Dispersion
Tube
Unit
Dimensions
for A
(in mm)
3 heater 480
6 heater 480
9 heater 760
12 heater 915

8
MOUNTING METHODS
Electrical
The current characteristics, and capacity requirements
should be checked against the nameplates. The control
cabinet should be mounted in a location convenient for
service. All wiring must be in accordance with all local
codes, and with VAPORSTREAM®Model VLC wiring
diagram. The diagram is inside the control cabinet. The
wiring between the control cabinet and humidifier must
be rated at 105°C minimum.
Caution: Only qualified electrical
personnel should perform installation
procedures.
5. Mounting Units Away from Duct(s) Using Vapor Hose
Airflow
Air Handling Unit Casing
Humidifier Centered in Air
Handling Unit
OM-653
6. Mounting In Air Handling Unit Gasketed Access Door
Supply Air Duct
Set unit level. Locate unit so that steam disper-
sion assembly is in the most active part of the
air stream.
Air Handling Unit Coil Section
Filter and Mixing Box
Outdoor and Return
Airflow into Air Han-
dling Unit
Vapor hose. (Pitch back min. 165 mm/m to humidifier with supports to
prevent sagging.) Maximum length 3 m. Humidifier must be mounted
level.
OM-638
Stainless steel dispersion tube in
middle of duct. Pitch as shown in
figure 9-1 on page 9.

9
Dispersion Tube Installation with Condensate Drain
Vapor Hose
When a vapor hose and stainless steel dispersion tube
are used, they should be pitched back to the humidifier.
A minimum slope of 165 mm/m (with no “low spots”) is
recommended. Vapor hose should be supported to pre-
vent sags or low spots. When this is not possible due
to duct elevation or an obstruction, alternate arrange-
ments should be used as shown in figure 15-1 or 15-2.
Any condensate that forms in the vapor hose must be
removed. Preferably, it should be returned to an open
drain with a water seal of sufficient height to contain the
duct static pressure, as shown in figure 10-1.
The condensate can also be returned to the VAPOR-
STREAM®VLC, as shown in figure 10-2, with an air
vent. This method requires a water seal and an air
gap to prevent back pressure from the VLC chamber.
Excessive back pressures imposed on the humidi-
fier may lead to dispersion tube(s) spitting, lost water
seals, or leaking gaskets. When the distance between
the humidifier and the dispersion tube(s) exceeds 3 m,
consult factory for special recommendations.
Hard Piping (when used)
• Hard piping should have a minimum of DN 40 (1 ½”).
• A minimum pitch of 165 mm/m back to the humidifier
must be maintained.
• 90° elbows are not recommended; use two 45° elbows
one foot apart instead.
• Thin-walled tubing will heat up faster and cause less
start up loss than heavy-walled pipe.
• Insulating the rigid piping will reduce output loss due to
condensation.
Tube Mounting
• Mount dispersion tubes pitched as stated above.
• Tubelets must discharge perpendicular to air flow.
• Return line piping material must be suitable for 100°C
water.
Min. Condensate Drain Line Sizing
• One or two tubes: DN 20 (¾”).
• Three or more tubes: DN 25 (1”).
DISPERSION TUBE INSTALLATION
Figure 9-1: Single Tube
DN 15 (½”) Stainless Steel (conden-
sate drain)
Movable Duct Plate (Can be mounted within limits of 65 mm.)
DN 8 (¼”) Coupling
Ø 15 mm
Ø “B” (TYP)
A
A
A
65
mm
165 mm/m Pitch
Mounting Nut
Pre-molded High
Temperature Resin Steam Tubelets
Insertion Length
OM-351
A
85 mm
10 mm/m Pitch
Mounting Nut
85 mm
Table 9-1: Dispersion Tube Capacities
Capacity
Ø Tube Without
Drain
With
Drain A B
38 mm 13 Kg/h 26 Kg/h 85 mm 40 mm
50 mm 26 Kg/h 39 Kg/h 130 mm 50 mm

10
DISPERSION TUBE INSTALLATION
Figure 10-1: Multiple Tube
with Condensate Wasted to
Floor Drain
Dispersion
Tube
Duct
Dispersion Tube
VAPORSTREAM®
VLC or VLDI Humidi-
fier
Ø DN 40 (1-½”) Vapor
Hose or Hard Tubing*
Water Seal
(125 mm approx.)
150 mm Min.
Floor Drain*
Condensate Drain
Tube by Others**
(DN 20 minimum)
* Refer to local codes for
drain pipe sizing requirements.
OM-696
DN 15 (½”) Condensate Drain Tube
Air Gap
Figure 10-2: Multiple
Tube with Condensate
Return to Humidifier
Dispersion Tube
Dispersion Tube
Duct
Water Seal
(125 mm
approx.)
13 mm
Air Vent
150 mm Min.
Ø DN 40 (1-½”)
Vapor Hose or
Hard Tubing *
Condensate Drain Tube
by Others,
DN 20 (¾”) Minimum
Refer to Water Seal Height,
Table 10-1
VAPORSTREAM VLC
or VLDI Humidifier
DN 20 (¾”)
Condensate Return
Connection
(on face plate)
DN 15 (½”) Condensate Drain Tube
OM-697
Table 10-1: Water Seal Minimum Height*
* Height required to overcome humidifier internal pressure.
Humidifier Kg/h Height
(mm)
Up to 48 KW 2-62 305
49 KW to
64 KW 63-83 380
65 KW to
100 KW 84-103 460

11
OPTIONAL WEATHER COVER
A weatherproof enclosure is available, as an option, for
the VAPORSTREAM®VLC. This weather cover is avail-
able in either galvanized or stainless steel and comes
in four sizes, designed to fit over a 3, 6, 9, or 12 heater
VLC (see figure 12-2 for dimensional data on the four
sizes). The weather cover encloses the VLC to protect it
from wind and water, and is ETL listed to conform to UL
standard 988. The weather cover is fully assembled at
the DRI-STEEM factory and is available with a remotely
mounted controller.
Instructions for Installation (See Page 12, Figures
12-1 and 12-2):
1. Remove the weather cover top and panels C and D
to access the water and electrical connections. A
11 mm (7/16”) socket wrench is required.
2. Connect water supply and drain piping (panel C).
3. Terminate main power to unit (panel D).
4. Check the hose cuff(s) and hose clamp(s) for loose-
ness created during shipment.
5. Re-attach the weather cover top and panels C and D
which were removed in step #1.
6. Check that all bolts are securely fastened.
7. Connect steam dispersion device(s) to the outlet(s)
on the humidifier.
8. Verify that a good seal is maintained after making
the connections.
NOTES:
The bottom of the weather cover is open to accomo-
date piping and electrical connections. These connec-
tions must be run in watertight plastic conduit due to
the outdoor environment.
Other modifications may need to be made by the in-
staller including:
• freeze protection on all water piping
• insulation of hard piping between humidifier and
dispersion device
Maintenance:
Periodic maintenance of the weather cover itself is rec-
ommended in order to insure it’s continued wind/water
proof state.
1. Periodically check the condition of the gasket(s).
Replace as needed or on an annual basis.
2. Annually check for loose bolts or connections.
3. Annually check the hose cuff(s) for signs of wear.
Replace as needed or on an annual basis.
4. Annually check the cover for any signs of corrosion
or degradation. Repair as needed.
Figure 11-1: VLC Weather Cover

12
Figure 12-2:
Callout Letter Callout Description Three (mm)
Six
(mm)
Nine
(mm)
Twelve
(mm)
AHeight 1290 1290 1290 1290
BLength 600 815 1015 1205
CWidth 635 600 600 600
DDistance from bottom 200 200 200 200
WEATHER COVER DIMENSIONS
Figure 12-2: Weather Cover Dimensions
OM-904
Panel Identifi-
cation
Label
BETL Certification Label
A
C
Product Identification Label
D
Figure 12-1: Weather Cover Exploded View
Panel A
Top Panel
Panel D
Panel C
OM-906A
Panel B
Table 12-1: 3, 6, 9, and 12 Heater Overall Dimensions of Weather Cover

13
RAPID-SORB® ASSEMBLY AND INSTALLATION
Instructions for Horizontal Duct
1. Unpack shipment and verify receipt of all RAPID-SORB
components with packing list. Report any shortages to
the DRI-STEEM factory immediately.
2. Provide necessary access in and around duct work.
3. Locate 25 mm x 40 mm stainless steel channel
inside the duct. Hang the channel from the top of the
duct, centered between duct side walls, with the two
mounting holes provided.
4. If hose cuffs are used, slide cuffs over the open end
of each tube. Install a pair of hose clamps on each tube.
5. Note direction of air flow within duct, then arrange
each dispersion tube so steam will discharge perpen-
dicular to the air flow. Use the hex bolts provided to
attach tubes to overhead 25 mm x 40 mm channel. Do
not secure. If the header is outside the duct (see figure
13-2), punch-out necessary clearance holes in the base
of the duct to slide dispersion tubes up from bottom.
6. For a Header Inside the Duct (See figure 13-1.):
Punch or cut out necessary clearance holes for
RAPID-SORB header. Slide header into the duct, posi-
tion header and slide the dispersion tube hose
cuffs or slip couplings over the header dispersion
tube nipples.
Position the header so vertical dispersion tubes are
perpendicular to duct and pitch the header to
condensate drain. Secure header to the mounting
bracket. Use escutcheon plates to secure header
where it enters the duct.
Check that the dispersion tubes discharge steam
perpendicular to the air flow. Secure tubes to the over-
head channel. Secure the channel to the duct. Position
hose cuffs or slip couplings over tube and header tube
nipples, and secure with clamps.
For a Header Outside the Duct (See figure 13-2.):
Position header under dispersion tubes, then slide
hose cuffs or slip couplings over header dispersion tube
nipples.
Position the header so dispersion tubes are perpendic-
ular to duct and pitch the header to condensate drain.
Secure dispersion tubes in place with the tube escutch-
eon plates provided.
Check the position of the tubes for steam release per-
pendicular to the air flow. Secure tubes to the overhead
channel, and secure channel to the duct. With header
pitched to condensate drain, slip hose cuffs or slip cou-
plings over tube nipples and secure with clamps.
7. Connect a condensate drain to the header, provide
the water trap as shown, and run to open drain, sized
according to local codes.
8. Attach the header steam supply connector to main
header using the hose cuff and clamps provided, but do
not secure.
9. Route the necessary number of vapor hoses or pipes
from the humidifier tank, position connector to accept
the hoses or pipes and secure.
Note: Refer to page 15 for vapor hose information on
Figure 13-1: RAPID-SORB Unit
Header Inside Duct
Top of Duct
or Casing
OM-102
Condensate
Drain, DN 20 (¾”)
20 mm Copper
Air Gap
*Open Drain
Pitch
10 mm/m
minimum
Hose Cuff
and Clamps
VAPORSTREAM®Model
VLC Humidifier
Orificed
Tubelets
A
A
Dispersion
Tube
3/8-16 x ½”
Hex Head
Bolt
25 mm x 40 mm
Channel (by DRI-STEEM)
Duct
Escutcheon
Plate
Figure 13-2: RAPID-SORB Unit
Header Under Duct
Slip Coupling
or Hose Cuff
View A-A
* Refer to local codes for drain pipe size requirements.
OM-101
Dispersion Tube
Orificed
Tubelets
Slip Coupling
or Hose Cuff
Optional Companion
Flange or Threaded Connec-
tion for Hard Piping
Header
Condensate Drain,
DN 20 (¾”)
20 mm Copper
Air Gap
*Open Drain
125 mm
Min.
150
mm
Min.
Nut and
Bolt
Duct or
Casing
25 mm x 40 mm
Channel (by DRI-STEEM)
Pitch 10 mm/m minimum
Mounting
Channel
Mounting
Nut
125 mm
Min.
150 mm
Min.

14
RAPID-SORB® ASSEMBLY AND INSTALLATION
Vertical Duct Installation
Install the RAPID-SORB with dispersion tubes and
header pitched to condensate drain as shown in figures
14-1,14-2, and 14-3.
See “Instructions for Horizontal Duct” for additional
information on page 13, as applicable.
Table 14-1*: Maximum Steam Carrying Capacity in kg/h
* Based on total pressure drop in piping/hose of 125 Pa.
** For developed length add 50% to measured length for pipe fittings.
Note: To minimize loss of humidifier capacity and efficiency, it is recommended that tubing/piping be
installed.
Vapor Hose Copper or Stainless Steel Tubing and
Schedule 40 Steel Pipe
Hose I.D. Developed Length
of 3.0 Meters**
Tube or
Pipe Size
Base on Developed
Length of 6 Meters**
40 mm 68 kg 40 mm 68 kg/h
50 mm 115 kg 50 mm 100 kg/h
75 mm 205 kg/h
100 mm 340 kg/h
125 mm 635 kg/h
150 mm 1043 kg/h
Figure 14-2: Elevation View Tube without Drain
150 mm Min.
125 mm Min.
Recommended
165 mm/m pitch
Airflow
Figure 14-1: Plan View
Steam
Supply
10 mm/m pitch
minimum
Drain
Figure 14-3: Elevation View Tube with Drain
DN 8 (¼”)
Open Drain
DN 20 (¾”)
Coupling
Condensate
Drain
Piping by others
Airflow
125 mm
Min.
150 mm
Min.
125 mm Min.
Recommended 10 mm/m
pitch minimum

15
Drain Piping
A drain line should be extended from the skimmer con-
nection to a sanitary waste or suitable drain.
If non-metallic pipe or hose is used, it must be capable
of withstanding temperatures up to 100° C.
To prevent steam from escaping out the drain line, a
water seal must be provided in the drain line of suf-
ficient height to contain the pressure developed within
the humidifier and steam dispersion system.
To determine the proper height of the water seal, see
table 16-1.
Make-up Water Piping
When non-metallic water piping is used, it must be
rated to withstand 100° C or greater temperature. If not,
the final one meter connected to the humidifier should
be metallic and should not be insulated.
As part of the fill valve assembly, the needle valve
restricts the rush of cold water entering the evaporating
chamber during the fill cycle. Cold water could drop the
chamber water temperature and collapse the steam. If
the rumbling sound occurs during the fill cycle, adjust
the needle valve to decrease the water fill rate.
The VAPORSTREAM®Model VLC has a 25 mm
internal “air gap”. However, local codes may require a
vacuum breaker.
PIPING METHODS
Figure 15-1: Piping method recommended when
obstruction prevents dispersion tube from being con-
tinuously pitched back to humidifier:
OM-698 Funnel or Floor Drain*
Obstruction
DN 20 (¾”) Tubing
125 mm Min.
100 mm
Min.
Figure 15-2: Piping method recommended when hu-
midifier must be mounted higher than the duct:
* Refer to local codes for drain pipe size requirements.
165 mm/m Pitch
125 mm Min.
Funnel or Floor Drain*
OM-699
Optional Tubing Tee

16
PIPING DIAGRAMS: STEAM, WATER AND DRAIN
Alternate Water Seal and Drain Valve Piping (by installer)
Used when water seal must be elevated above flow line of drain connection (humidifier near floor)
OM-633
* Refer to local codes for drain pipe sizing and maximum temperature requirements.
OM-635
Solenoid Water
Make-up Valve Needle
Valve
Water Skim/Over-
flow Outlet
Water Supply Line,
172 kPa minimum,
Note: Flow Line of
Water Seal cannot be
above Flow Line of
Skimmer Outlet
H
Air Gap
Open Drain*
Manual or Optional Electric Drain Valve
Drain Connection
Clean-out Plate
Table 16-1: Water Seal Height (H)
Recommendations
Note: If piping to dispersion tube is over 6 meters increase
water seal height by 15%.
Note: Drain piping material must be suitable for 100°C water.
DI/RO Water Unit
¾” SST
Drain Valve
H
Float Operated Water
Make-up Valve
Overflow - 20 mm
DN 8 Water Supply,
172 kPa minimum
Drain and Water Seal
Piping - DN 20 (¾”)
(by installer)
Air Gap
Open Drain*
Float Operated
Low-Water Cut-off
Heaters
OM-634
Standard Unit (Non-DI/RO Water)
Heaters H
Clean-out Tray
Clean-out
Plate
Three Probe Level Control
and Low-Water Cut-off Drain
Connection
Open Drain*
Air Gap
Drain and Water Seal Piping - DN 20 (¾”)
(by installer)
Manual or Optional Electric Drain Valve
Water Supply Line (172 kPa minimum)
Water Skim/Overflow Outlet - DN 20 ( ¾”)
Needle Valve
Solenoid Water Make-up Valve
Humidifier Kg/h Height
(mm)
Up to 48 KW 2-62 305
49 KW to
64 KW 63-83 380
65 KW to
100 KW 84-103 460

17
START-UP PROCEDURE
Introduction
After the system has been properly installed and con-
nected to both electrical and water supplies, it may then
be started.
Start-up and Checkout Procedures
Mounting
Check mounting to see that unit is level and securely
supported before filling with water.
Piping
Verify that all piping connections have been completed
as recommended and that water pressure is available.
Electrical
Verify that all wiring connections have been made in
accordance with all governing codes and the enclosed
VAPORSTREAM®VLC wiring diagram.
Caution: Only qualified electrical person-
nel should perform start-up procedure.
Control System
For start-up instructions, see the operations and main-
tenance manual for your humidifier control system.
OPERATION
For operating instructions, see the VAPOR-LOGIC ®
Installation Instructions and Maintenance Operations
Manual.
Caution: Overtightening cover will cause
leaks.
All cover knobs are turned down at the factory until
the bottom of the knob makes contact with the
flange, then one half turn further. If more compres-
sion is required, turn all knobs a half turn more. Do
not turn knobs more than a half turn before identify-
ing that a leak still exists.

18
RECOMMENDED MAINTENANCE
VAPORSTREAM®Model VLC Only
Using softened water will significantly reduce mineral
build-up in the humidifier. When softened water is not
available, the VAPORSTREAM VLC is designed to deal
with water hardness in one of two ways depending on
the degree of hardness. For light to moderate hard-
ness, up to 170 mg/l, using the surface water skim time
feature with annual cleaning is recommended. For high
mineral content water, above 170 mg/l, a periodic drain
and flush through the motorized drain valve, in addition
to the surface water skim time feature, is recommend-
ed. The frequency of cleaning will depend on water
condition and evaporation load.
The humidifier should be inspected for leaks at least
annually. Also, the current draw of the heaters should
be checked and all safety devices in the control cir-
cuit should be cycled on and off to verify that they are
functioning.
Caution: When performing maintenance on the VA-
PORSTREAM Model VLC, always set control module
switch to “STBY” position, place main disconnect in
“OFF” position, and close manual water shut-off valve.
Seasonally or as Required
1. Cleaning Tank - Slide the clean-out tray out and
dispose of any loose scale that has collected in the tray.
This should be done before the build-up reaches the
underside of the heating elements.
2. Cleaning Probes - Disconnect the plug and cable
assembly and unscrew the probe holder from the
VAPORSTREAM VLC unit. The scale will easily flake
off from the sensing portion. The sensing portion, bot-
tom 10 mm, of the probe should be brushed clean with
stainless steel wool.
3. Cleaning Skim Overflow Port - Loosen deposits
with a long tool, such as a screwdriver. Proper skimmer
drainage should be verified by a weekly visual inspec-
tion. Water should drain from skimmer drain pipe after
each fill cycle. (For cleaning piping, disconnect and
flush out. If mineral deposits have restricted the flow,
replace piping.)
Summer Maintenance
After the humidification season, a complete inspection
and cleaning of the heaters, probe control, skimmer
port, and water chamber is recommended. After clean-
ing, the unit should remain empty until humidification is
required.
Adjusting the Surface Skim Bleed-Off Quantity
The skim time determines the quantity of water
skimmed with each fill cycle. The skim time is field ad-
justable using the VAPOR-LOGIC®keypad.
Each time the VAPORSTREAM VLC refills, it fills to
an elevation near the lip of the skim overflow fitting. A
portion of the refill water then flows to drain carrying the
minerals floating on the water with it. This reduces the
mineral concentration, thereby reducing the frequency
of cleaning needed.
The heated water that flows to drain is a cost of
operation. Cleaning the humidifier is also an opera-
tional cost. Therefore, it is recommended that the user
observe and adjust the skimming quantity. By doing so,
a balance between minimizing mineral build-up and
conserving hot water can be achieved.
VAPORSTREAM Model VLDI Only
The humidifier should be inspected for leaks at least
annually. Also, the current draw of the heaters should
be checked and all safety devices in the control cabi-
net should be cycled on and off to verify that they are
functioning.
Make-up Water Piping
Use cold or hot makeup water. If the water pressure is
above 410 kPa and/or water hammer would be objec-
tionable, a pressure reducing valve or shock arrester
should be installed. Even though the VAPORSTREAM
VLC has an internal 25 mm air gap, some local codes
may require a vacuum breaker.
Caution: Minimum water supply pressure is 172 kPa.
Cleaning Evaporating Chamber
As long as mineral-free water is used in the VAPOR-
STREAM VLDI, no cleaning or flushing of the evaporat-
ing chamber should be necessary.
For trouble-shooting instructions, see the VAPOR-LOGIC ®
Installation Instructions and Maintenance Operations Manual.
TROUBLE-SHOOTING GUIDE

19
REPLACEMENT PARTS
VAPORSTREAM®Model VLC Humidifier
TAB - Specify humidifier model
and serial numbers when ordering.
Notes:
1. For dispersion tube(s) specify
type (L-tube, straight tube,
RAPID-SORB®, etc) humidifier
model and serial numbers.
2. Parts not itemized are typical
hardware stock items.
OM-907
No. Description Part No.
1 Tank 167700-TAB
2 Cover, One Heater 167710-TAB
2 Cover, Three Heater 167715-TAB
2 Cover, Six Heater 167720-TAB
2 Cover, Nine Heater 167725-TAB
2 Cover, Twelve Heater 167730-TAB
3 Cover, Heater Louvered 167740-TAB
4 Knob, T-Handled Utility 700725
5 Heater 409600-TAB
6 Gasket, Cover 160691-TAB
7 Clean-Out Plate 165472
8 Gasket, Clean-Out Plate 308225
9 Switch Door Interlock 408475
10 Thermal Cut-Out 409560-001
11 Valve, DN 20 (¾") Ball (Manual Drain) 505011
12 Valve, DN 20 (¾") Electric (Auto Drain) 505400-001
13 Probe Plug 406050-002
14 Probe Housing 308500
15 Probe Assembly 406015
16 Gasket, Probe 309750-004
17 Strainer, DN 8 (¼") Sediment 300050
18 Valve, DN 8 (¼") Needle 505070-001
19 Fill Valve, DN 8 (¼") Solenoid 505084
20 Clean-Out Tray 167770-TAB

20
VAPORSTREAM Model VLDI Humidifier
OM-908
REPLACEMENT PARTS
No. Description Part No.
1 Tank 167700-TAB
2 Cover, One Heater 167710-TAB
2 Cover, Three Heater 167715-TAB
2 Cover, Six Heater 167720-TAB
2 Cover, Nine Heater 167725-TAB
2 Cover, Twelve Heater 167730-TAB
3 Cover, Heater Louvered 167740-TAB
4 Knob, T-Handled Utility 700725
5 Heater 409600-TAB
6 Gasket, Cover 160691-TAB
7 Clean-Out Plate 165472
8 Gasket, Clean-Out Plate 308225
9 Switch Door Interlock 408475
10 Thermal Cut-Out 409560-001
11 Valve, DN 20 (¾") Ball (Manual Drain) 505000-001
12 Float Valve Assembly 505210
13 DI Housing 167780
14 Gasket, Low Water Tube 160698
15 Low Water Tube 167785
16 Low Water Cut-Out Switch 408420-001
TAB - Specify humidifier model
and serial numbers when ordering.
Notes:
1. For dispersion tube(s) specify
type (L-tube, straight tube,
RAPID-SORB®, etc) humidifier
model and serial numbers.
2. Parts not itemized are typical
hardware stock items.