VAPORSTREAM VLC User manual

READAND SAVE THESE INSTRUCTIONS
VAPORSTREAM
Models VLC and VLDI
ELECTRIC STEAM HUMIDIFIERS
Installation Instructions
and
Maintenance Operations
Manual
®
CUL LISTEDUL LISTED

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
Capacities and Electrical Specifications ...........................4
Mechanical Specifications ..................................................5
VAPORSTREAM Model VLC Area-Type Humidifier ..........6
Mounting Methods
Mounting Procedures .................................................7
Dispersion Tube Installation.......................................9
RAPID-SORB™Assembly
Horizontal Duct Installation .......................................11
Vertical Duct Installation ...........................................12
Installation Requirements
Electrical ....................................................................13
Drain Piping................................................................15
Make-up Water Piping................................................15
Vapor Hose Piping .....................................................15
Piping Diagrams: Steam, Water and Drain ................16
Start-up Procedure ..............................................................18
Operation..............................................................................18
Maintenance .........................................................................19
Trouble-Shooting Guide .....................................................19
Replacement Parts............................................................... 20
Maintenance Service Record ..............................................22
Two-Year Limited Warranty ................................................24
TABLE OF CONTENTS

3
VAPORSTREAM®Models VLCAND VLDI
VAPORSTREAM VLC
Electric Humidifier
State-of-the-art technology in a
simple, low-maintenance humidi-
fier.
This humidifier is designed to be
used with either softened or
unsoftened water (preferably
softened). The probe-type level
control system requires water
conductivity of 100 µS/cm
(34 mg/l) minimum to function,
and therefore will not operate on
water treated by reverse osmo-
sis or deionization. However,
VAPORSTREAM Model VLC
humidifiers are available for use
with these water types. The
standard humidifier 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 humidifica-
tion control. It is virtually mainte-
nance-free with no wasted
water, no wasted heat, and very
little or no downtime.
OM-628
OM-1000
Cover Knobs
Cover
3/4" Overflow
Float Valve
Low-Water Cut-Off
3/4" SST Drain Valve
Control Cabinet
Probes
VAPOR-LOGIC®
Raised Heater
Dispersion Tube
Duct
Cover
Cover Knobs
EvaporatingChamber
Skimmer Port Outlet
Fill Valve
Needle Valve
Manual or Electric
Drain Valve
Clean-out Tray
Thermal Cut-Out

4
*Heater stage identifies the number of contactors.
* *Refer to table 4-2 for Control Cabinet Dimensions.
Model
Number
Heaters Current Draw (A) Control
Cabinet
Sizes**
Single Phase Three Phase
Qty Stages* 230V kW Capacities
(kg/h) 400V kW Capacities (kg/h)
VLC/VLDI
2-1 1 1 8.0 1.84 2.4 M
3-1 1 1 12.0 2.76 3.7 M
4-1 1 1 16.0 3.68 4.8 M
5-1 1 1 21.3 4.90 6.3 M
VLC/VLDI
6-1 3 1 24.0 5.52 7.2 8.7 6 7.8 M
9-1 3 1 35.9 8.28 10.8 13.0 911.7 M
12-1 3 1 47.9 11.04 14.3 17.3 12 15.5 M
16-1 3 1 23.1 16 20.7 M
21-1 3 1 30.3 21 27.2 M
25-1 3 1 36.1 25 32.3 M
VLC/VLDI
12-2 6 2 47.9 11.04 14.3 17.3 12 15.5 M
18-2 6 2 71.9 16.56 21.4 26.0 18 23.3 M
24-2 6 2 95.8 22.08 28.5 34.6 24 31.0 M
32-2 6 2 46.2 32 41.4 M
42-2 6 2 60.6 42 54.3 M
50-2 6 2 72.2 50 64.6 M
VLC/VLDI
18-3 9 3 71.9 16.56 21.4 26 18 23.3 L
27-3 9 3 107.8 24.84 32.2 39 27 35.0 L
36-3 9 3 143.8 33.12 42.8 52 36 46.5 L
48-3 9 3 69.3 48 62.1 L
63-3 9 3 90.9 63 81.5 L
75-3 9 3 108.3 75 97.0 L
VLC/VLDI
24-4 12 4 95.8 22.08 28.5 34.6 24 31.0 XL
36-4 12 4 143.8 33.12 42.8 52 36 46.5 XL
48-4 12 4 191.7 44.16 57.1 69.3 48 62.1 XL
64-4 12 4 92.4 64 82.7 XL
84-4 12 4 121.2 84 108.7 XL
100-4 12 4 144.3 100 129.3 XL
CAPACITIESAND ELECTRICAL SPECIFICATIONS
Table 4-1: Capacities and Electrical Specifications
Capacity Notes
Approximately 400 kJ are required to raise the temper-
ature of one kg of water from 5° to 100° C. An addi-
tional 2230 kJ are required to change one kg of water
to water vapor.
The addition of 20 mm rigid foil faced fiberglass insula-
tion (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 4-2: Control Cabinet Dimensions
Size Milimeters Shipping
Wt.
Series M 355 w x 400 h x 150 d 15 kg
Series L 500 w x 500 h x 180 d 25 kg
Series XL 600 w x 600 h x 180 d 33 kg

5
MECHANICALSPECIFICATIONS
OM-626
B
AC
Front ViewSide ViewBack View
Figure 5-1: Dimensions
Table 5-1: Mechanical Specifications
Model
Number A B C Weight
Empty
(kg)
Weight
Full
(kg)
mm mm mm
VLC/VLDI
2-1 515 430 190 16 36
3-1 515 430 190 16 36
4-1 515 430 190 16 36
5-1 515 430 190 16 36
VLC/VLDI
6-1 560 465 325 26 71
9-1 560 465 325 26 71
12-1 560 465 325 26 71
16-1 560 465 325 26 71
21-1 560 465 325 26 71
25-1 560 465 325 26 71
VLC/VLDI
12-2 560 465 515 36 108
18-2 560 465 515 36 108
24-2 560 465 515 36 108
32-2 560 465 515 36 108
42-2 560 465 515 36 108
50-2 560 465 515 36 108
VLC/VLDI
18-3 560 465 705 50 148
27-3 560 465 705 50 148
36-3 560 465 705 50 148
48-3 560 465 705 50 148
63-3 560 465 705 50 148
75-3 560 465 705 50 148
VLC/VLDI
24-4 560 465 900 70 194
36-4 560 465 900 70 194
48-4 560 465 900 70 194
64-4 560 465 900 70 194
84-4 560 465 900 70 194
100-4 560 465 900 70 194
95
mm
100
mm

6
VAPORSTREAM®Model VLCArea-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 visible, 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) dimen-
sions that can be expected with the
Area-Type humidifiers.
To avoid steam impingement on surrounding
areas, these dimensions 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.
Heaters OM-681
Steam Chute


Fan
Space
Temp Space R.H. 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
Figure 7-1: Mounting Support Methods
Floor Stand Method Trapeze Hanger Method Wall Brackets Method
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
OM-646
MOUNTING METHODS
OM-648
625 mm
Provide 460 mm min.
clearance under duct
for cover removal
Secure rods to
overheadconstruction
Threaded rod of
sizerequired
Angleorchannel
of size required
Cleanout
Two-piece Escutcheon Plate
fastens to bottom of duct
(duct omitted for clarity)
Cover of VAPORSTREAM
Humidifier
Clamp
VaporHose
Bottom of Duct
Two-piece Escutcheon Plate
Cover of VAPORSTREAM
Humidifier
460 mm min.
Cut hole in duct large
enough to allow
passage of hose clamp
OM-65 OM-66
Steam Dispersion
Tube
settles to the bottom. A clean-out tray on the floor of
the evaporator 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.
DRI-STEEM
wall brackets
(optional)
2required
A
Steam Dispersion
Tube
OM-647
DRI-STEEM support
legs(optional)
560 mm
Unit Dimensions
A
3 Heater 480 mm
6 Heater 480 mm
9 Heater 760 mm
12 Heater 915 mm
Figure 7-2: Mounting Unit Below Duct
Mounting humidifier 460 mm below duct is recommended to facilitate cover removal.

8
Figures 8-1 and 8-2: Mounting Units Away from Duct(s) Using Vapor Hose
MOUNTING METHODS
OM-639
Humidifier should be mounted level
Vapor hose (pitch back 165 mm/m to humidifier with supports to
prevent sagging). Maximum length 3 m. Humidifier should be
mounted level.
OM-638
Airflow
Air Handling Unit Casing
Humidifier
Centered in Air
Handling Unit
OM-276
Figure 8-3: Mounting In Air Handling Unit
Gasketed Access Door
Supply Air Duct
Set unit level. Locate unit so that steam
dispersion 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 Handling Unit
Vapor hose (pitch back
165 mm/m to humidifier
with supports to prevent
sagging).
Maximum length is 3 m.
Stainless steel dispersion tube in middle
of duct. Pitch as shown in figure 11-1.
Maximum tube length is 3 m.
Zone Valves
25 mm x 25 mm x 6 mm
Angle Iron Support Legs
(optional)

9
Capacity
Tube Without With A B
Dia. Drain Drain
25 mm 4.5 kg/h N/A 80 mm 25 mm
40 mm 13 kg/h 26 kg/h 80 mm 38 mm
50 mm 26 kg/h 38 kg/h 125 mm 50 mm
MOUNTING METHODS
Dispersion Tube Installation with
Condensate Drain
(over 13 kg/h per dispersion tube)
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
prevent sags or low spots. When this is not possible
due to duct elevation or an obstruction, alternate
arrangements 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 VLC, as
shown in figure 10-2, with an air vent. This method
requires a water seal and an air gap to allow conden-
sate to flow back into the VLC chamber.
Excessive back pressures imposed on the humidifier
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 metres,
consult factory for special recommendations.
Rigid Piping (when used)
•Vapor piping should have a minimum I.D. of 40 mm.
•A minimum pitch of 165 mm/m back to the humidifier
should be maintained.
•90°elbows are not recommended; use two 45°
elbows 300 mm 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
•Tubes without condensate return lines, mount
dispersion tube with outboard end 165mm/m
higher than supply end (Example A).
•Tubes with condensate return lines, mount
dispersion tube level (Example B).
•Best vapor absorption occurs when dispersion tube
discharges against the air flow.
•Return line piping material must be suitable for
100°C water.
Minimum Condensate Drain Line Sizing
•One or two tubes: 20 mm I.D.
•Three or more tubes: 25 mm I.D.
Figure 9-1: Single Tube
10 mm O.D. (condensate drain)
Movable Duct Plate (Can be mounted within limits of 60 mm.)
¼" Nipple
80 mm
15 mm Dia.
"B" Dia. (TYP)
A
A
A60
mm
165 mm/m Pitch
Level or 20 mm/m Pitch
Mounting Bracket
Pre-moldedHigh
Temperature Resin Steam Tubelets
Insertion Length
OM-351
Table 9-1: Dispersion Tube Capacities
A
80 mm
ExampleA
ExampleB
Mounting Bracket

10
Humidifier kg/h Height
Up to 48 kW 2-62 300 mm
49 kW to 64 kW 63-83 375 mm
65 kW to 100 kW 84-103 450 mm
MOUNTING METHODS
OM-697
Table 10-1: Water Seal Minimum Height*
*Heightrequiredtoovercomehumidifierinternalpressure.
Figure 10-1: Multiple Tube
with Condensate Wasted
to Floor Drain Dispersion Tube
Duct
Dispersion Tube
VAPORSTREAM®
VLC or VLDI
Humidifier
Vapor Hose or
Hard Tubing
Water Seal
(125 mm approx.)
150 mm min.
Floor Drain*
CondensateDrain
Tube by Others** (20 mm minimum)
*Refer to local codes for drain pipe sizing requirements.
**Return line piping material must be suitable for 100° C water.
OM-696
Condensate Drain Tube
Figure 10-2: Multiple
Tube with Condensate
Return to Humidifier
Dispersion Tube
Dispersion Tube Duct
Water Seal
(125 mm approx.)
25 mm
airgap
150 mm min.
Vapor Hose or
Hard Tubing
CondensateDrain
Tube by Others**
VAPORSTREAMVLC
or VLDI Humidifier
3/4" Condensate
Return Connection
(on face plate)
Condensate Drain Tube
25 mm air gap
Refer to Water Seal
Height, Table 10-1

11
RAPID-SORBTMASSEMBLYAND 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 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 hex bolts and nuts to attach
tubes to overhead channel. Do not secure. If the
header is under the duct (see figure 11-2), 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 11-1):
Punch or cut out necessary clearance holes for
RAPID-SORB header. Slide header into the duct,
position 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 conden-
sate drain. Secure header mounting bracket to the
ductwork. 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
overhead 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 Under the Duct (See figure 11-2):
Position header under dispersion tubes, then slide hose
cuffs or slip couplings over header dispersion tube
nipples.
Position the header so dispersion tubes are perpen-
dicular to duct and pitch the header to condensate
drain. Secure header mounting bracket to a support
strap. Secure dispersion tubes in place with the tube
escutcheon plates provided.
Check the position of the tubes for steam release
perpendicular 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 couplings 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
routing and for alternate vapor hose installation
methods.
Figure 11-1: RAPID-SORB Unit
Header Inside Duct
Mounting
Channel
Top of Duct
or Casing
Dispersion Tube
OM-102
Mounting
Bracket
150 mm
min.
125 mm
min.
Condensate
Drain, 3/4"
20 mm Copper
AirGap
*Open Drain
10 mm/m
Pitch (min.)
Hose Cuff
and Clamps
VAPORSTREAM®Model VLC Humidifier
Orificed
Tubelets
A
A
Dispersion
Tube
Hex Head
Bolt
25 mm x 25 mm S.S.T.
Channel (by DRI-STEEM)
Duct
Escutcheon
Plate
Figure 11-2: RAPID-SORB Unit
Header Under Duct
SlipCoupling
or Hose Cuff
View A-A
Orificed
Tubelets
SlipCoupling
or Hose Cuff
150
mm
min.
125 mm min.
Condensate
Drain, 3/4"
20 mm Copper
AirGap
*Open Drain
Header
OptionalCompanion
Flange or Threaded
Connection for Hard Piping
Duct or
Casing
S.S.T. Channel (by DRI-STEEM)
* Refer to local codes for drain pipe size requirements.
OM-101
10 mm/m Pitch
Mounting
Bracket

12
RAPID-SORBTM ASSEMBLYAND INSTALLATION
Vertical Duct Installation
Install the RAPID-SORBTM with dispersion tubes and
header pitched to condensate drain as shown in figures
12-1,12-2, and 12-3.
See "Instructions for Horizontal Duct" for additional
information, as applicable.
Figure 12-1: Plan View
Steam
Supply
10 mm/m pitch
minimum Drain 150 mm min.
Recommended
165 mm/m pitch
Figure 12-2: Elevation View
Tube without Drain
Airflow
Figure 12-3: Elevation View
Tube with Drain
Recommended
20 mm/m pitch
Airflow
1/4"
CondensateDrain
125 mm min.
150 mm
min.
3/4" Coupling
125 mm min.
OpenDrain
25 mm air gap
125 mm min.
OM-700

13
Caution: Only qualified electrical
personnel should perform installation
procedures.
INSTALLATIONREQUIREMENTS
When selecting a space to install the VLC humidifier,
avoid areas close to sources of electromagnetic
emissions such as KVA transformers.
Control wiring and power wiring must be run in dedi-
cated/separate earthed metal conduit, cable trays or
trunking. Separation must occur in supply lines and
interconnecting lines when control cabinet is mounted
away from the humidifier.
Grounding requirements: the earth must be made by
solid metal-to-metal connections. The ground must be
a good radio frequency earth. Ground wire should be
same size as power wiring.
Figure 13-1: Field Wiring
Requirements Power
Supply
Panel
(refer to
tables on
page 14 for
wire size)
Disconnect (supplied
by others) Fused
disconnect on single
contactor units
Field Wire Power Supply Conduit
Connection Recommendations
Field Wire Power Supply Conduit
Connection Recommendations
VLC Humidifier OM-1013
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.
Refer to the amp draw on the rating plate and use the
tables on page 14 to determine the appropriate wire,
conduit and fuse disconnect (on single contactor
models).
VLC Control Cabinet

14
For maximum E.M.C. effectiveness, all humidity, temperature and air flow controls should be wired using multi-
conductor shielded plenum-rated cable with a drain wire for the shield. The drain wire should be connected to the
shield ground terminal with its length kept to less than 50 mm.
INSTALLATIONREQUIREMENTS
To Control Board SensorWires
Drain Wire (less than 50 mm)
ShieldGround
To Sensor
Conduit Size (Ømm)
**Amp Draw Incoming Wire Size 4 Conductor and
Ground*
AWG KcMIL (mm2)
0-10.0 14 2.5 32
10.1-13.3 12 4.0 32
13.4-20.0 10 6.0 32
20.1-33.3 8 10.0 40
33.4-43.3 6 16.00 40
43.4-56.7 4 25.0 50
56.8-76.7 2 35.0 63
76.8-86.7 1 50.0 63
86.8-116.7 2/0 70.0
Conduit Size (Ømm)
**Amp Draw Incoming Wire Size 2 Conductor
and Ground 3 Conductor and Ground
AWG KcMIL (mm2)
0-12.5 14 2.5 20 25
12.6-16.7 12 4.0 25 32
16.8-25.0 10 6.0 25 32
25.1-41.7 8 10.0 32 32
41.8-54.2 6 16.0 32 40
54.3-70.8 4 25.0 40 50
70.9-95.8 2 35.0 50 50
95.9-108.3 1 50.0 50 63
108.4-145.8 2/0 70.0 63 63
Figure 14-1: Shielded Cable Drain Wire Connection to Earth Bar
Table 14-1: Conduit and Wire Size
* For use with star wiring for 240V heaters used with 415V power supply.
** Refer to Amp Draw on Rating Plate.
Table 14-2: Conduit and Wire Size
**Amp Draw Fuse Size (A)
0-8.7 10
8.8-13.0 15
13.1-17.4 20
17.5-19.2 25
19.3-21.7 25
21.8-26.1 30
26.2-29.1 35
29.2-30.4 35
30.5-34.7 40
34.8-39.1 45
39.2-43.5 50
43.6-52.2 60
52.3-60.9 70
61.0-69.6 80
69.7-78.3 90
78.4-87.0 100
87.1-95.7 110
95.8-104.4 120
104.5-113.1 130
113.2-121.8 140
121.9-130.5 150
Table 14-3: Fuse/Breaker
Requirements

15
Figure 15-1: Piping method recommended when
obstruction prevents dispersion tube from being
continuously pitched back to humidifier
Drain Piping
A drain line should be extended from the skimmer
connection 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 suffi-
cient height to contain the pressure developed within
the humidifier and steam dispersion system. To deter-
mine the proper height of the water seal, see
table 17-1.
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 1 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
a rumbling sound occurs during the fill cycle, adjust the
needle valve to decrease the water fill rate.
INSTALLATIONREQUIREMENTS
Figure 15-2: Piping method recommended when
humidifier must be mounted higher than the duct
OM-698
Funnel or Floor Drain*
Obstruction
20 mm Tubing
125 mm
min.
100 mm
min.
* Refer to local codes for drain pipe size requirements.
165 mm/m
Pitch
125 mm
min. Funnel or Floor Drain*
OM-699
Optional SST Tubing Tee
The VAPORSTREAM®Model VLC has a 25 mm
internal “air gap”. However, local codes may require a
vacuum breaker.
Vapor Hose Piping
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. When this is not possible due
to duct elevation or an obstruction, alternate arrange-
ments may be used as shown below.
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
VAPORSTREAM 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
VAPORSTREAM VLC tank affecting condensate
returning below the VAPORSTREAM VLC water line.

16
PIPING DIAGRAMS: STEAM, WATER AND DRAIN
Heaters
Figure 16-1: Standard Unit
(Non-DI/RO Water)
3/4" SST Drain Valve
H
Figure 16-2: DI/RO Water Unit
H
Clean-out Tray
Clean-out
Plate
Three Probe Level Control
and Low-Water Cut-off
Drain Connection OpenDrain*
AirGap
Drain and Water Seal Piping
20 mm (by installer)**
Manual or Optional Electric
DrainValve
Water Supply Line
(170 kPa minimum)
Water Skim/Overflow Outlet
NeedleValve
Solenoid Water Make-up Valve
Float Operated Water Make-up Valve
Overflow
¼" Water Supply
(170 kPa minimum)
AirGap
Open Drain *
Float Operated Low-Water Cut-off
Heaters
OM-633
OM-634
Drain and Water Seal Piping
20 mm (by installer)**
* Refer to local codes for drain pipe sizing and maximum temperature requirements.
** Drain piping material must be suitable for 100° C water.

17
Humidifier kg/h Height
Up to 48 kW 2-62 300 mm
49 kW to 64 kW 63-83 375 mm
65 kW to 100 kW 84-103 450 mm
Figure 17-1: 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)
Table 17-1: Water Seal Height (H) Recommendations
Note: If piping to dispersion tube is over 6 metres increase water seal height by 15%.
Solenoid Water Make-up Valve NeedleValve
Water Skim/Overflow Outlet
Note: Flow Line of Water Seal cannot
be above Flow Line of Skimmer Outlet
Water Supply Line
(170 kPa minimum)
H
OpenDrain*
AirGap
Manual or Optional Electric Drain Valve
Drain Connection
Clean-outPlate
* Refer to local codes for drain pipe sizing and maximum temperature requirements.
OM-635
PIPING DIAGRAMS: STEAM, WATERAND DRAIN

18
START-UP PROCEDURE
Introduction
After the system has been properly installed and
connected 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
maintenance 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.

19
Cool Down Note
Caution: Insulated and uninsulated tanks will have hot
surfaces. Allow unit to cool before performing any
maintenance. Manually open the drain valve and the fill
valve will be energized. Let the fill water run until the
tank is cooled, then shut off the field-installed supply
water valve.
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 hardness
(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 recom-
mended. 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 circuit
should be cycled on and off to verify that they are
functioning.
Caution: When performing maintenance on the
VAPORSTREAM Model VLC, always set control
module switch to "STBY” position, place main discon-
nect 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
(bottom 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
MAINTENANCE
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
cleaning, the unit should remain empty until humidifica-
tion 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
adjustable 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
most of the minerals left by the previous evaporating
cycle. 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 operational
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 cabinet
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 170 kPa.
Cleaning Evaporating Chamber
As long as mineral-free water is used in the
VAPORSTREAM VLDI, no cleaning or flushing of the
evaporating chamber should be necessary.
For trouble-shooting instructions, see the VAPOR-LOGIC®
Installation Instructions and Maintenance Operations
Manual.
TROUBLE-SHOOTING GUIDE

20
REPLACEMENT PARTS
Figure 20-1: VAPORSTREAM®Model VLC Humidifier
* Specify humidifier model and serial numbers when ordering.
Notes:
1. For dispersion tube(s) specify type (L-tube, straight tube), humidifier
model and serial numbers.
2. Parts not itemized are typical hardware stock items.
OM-650
No. Description Part No.
1 Chamber *
2 Cover, Chamber *
3 Cover, Louvered *
4 Knob, T-Handled Utility 700725
5 Heater *
6 Valve, ¼" Brass Fill 505080*
7 Sediment Strainer, ¼" 300050
8 Valve, ¾" Sweat Brass (Manual Drain) 505011
9 Valve, ¾" HW Drain (Auto Drain) 505400*
10 Probe Assembly 406015
No. Description Part No.
11 Probe Plug Wire Assembly 406050-002*
12 Gasket, Cover 160691*
13 Clean-Out Plate 165472
14 Gasket, 90 mm x 300 mm 308225
15 Valve, Needle ¼" 505070-001
16 Thermal Cut-Out 409560-001
17 Gasket, Probe 160698
18 Probe Housing, Nylon 308500
19 Switch, Interlock 408475
20 Tray, Clean-Out 167770*