DriSteem XT Series User manual

XT Series
Electrode Steam Humidifiers
Installation, Operation,
and Maintenance Manual

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Warnings and cautions
8BSOJOHTBOEDBVUJPOT
WARNING
Indicates a hazardous situation that could result in death or
serious injury if instructions are not followed.
CAUTION
Indicates a hazardous situation that could result in damage to
or destruction of property if instructions are not followed.
mc_051508_1145
WARNING
Attention installer
Read this manual before installing, and leave this manual with product owner. This product must be installed by
qualified HVAC and electrical contractors. Installation must be code approved. Improper installation can cause
property damage, severe personal injury, or death as a result of electric shock, burns, or fire.
DRI-STEEM®technical support: [phone]
Read all warnings and instructions
Read this manual before performing service or maintenance procedures on any part of the system. Failure to follow all
warnings and instructions could produce the hazardous situations described, resulting in property damage, personal
injury, or death.
Failure to follow the instructions in this manual can cause moisture to accumulate, which can cause bacteria and mold
growth or dripping water into building spaces. Dripping water can cause property damage; bacteria and mold growth
can cause illness.
Hot surfaces and hot water
This steam humidification system has extremely hot surfaces. Water in steam cylinders, steam pipes, and dispersion
assemblies can be as hot as 212 °F (100 °C). Discharged steam is not visible. Contact with hot surfaces, discharged
hot water, or air into which steam has been discharged can cause severe personal injury. To avoid severe burns,
follow the cool-down procedure in this manual before performing service or maintenance procedures on any part of
the system.
Disconnect electrical power
Disconnect electrical power before installing supply wiring or performing service or maintenance procedures on any
part of the humidification system. Failure to disconnect electrical power could result in fire, electrical shock, and other
hazardous conditions. These hazardous conditions could cause property damage, personal injury, or death.
Contact with energized circuits can cause property damage, severe personal injury, or death as a result of electrical
shock or fire. Do not remove cabinet doors until electrical power is disconnected.
Follow the shutdown procedure on Page 48 before performing service or maintenance procedures on any part of
the system.

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8BSOJOHTBOEDBVUJPOT
CAUTION
Follow steam piping recommendations
Controlling condensate flow and collection in an XT Series humidifier system is critical to maximum performance. Failure
to follow the steam piping recommendations in this manual can cause system pressure fluctuations and increase cylinder
pressure, steam velocity, and condensate noise.
Hot discharge water
Discharge water can be as hot as 212 °F (100 °C) and can damage some drain plumbing materials not rated for hot drain
water. To prevent such damage, make sure drain water tempering is selected, and supply water is not heated. Do not shut
off supply water to the cylinder before it is drained.
Excessive supply water pressure
Supply water pressure greater than 80 psi (550 kPa) can cause the humidifier to overflow.
mc_123010_1520-XT
WARNING
Electrical shock hazard
If the humidifier starts up responding to a call for humidity during maintenance, severe bodily injury or death from
electrical shock could occur. To prevent such start-up, follow the shutdown procedure on Page 48.

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Warnings and cautions ................................ ii
Product overview .................................... 2
Models, capacities, and electrical specifications ............ 4
Dimensional drawings ................................. 6
Dimensions and weights ............................... 7
Dispersion options ................................... 8
Installation
Selecting a location .....................................9
Staging multiple XT Series humidifiers ....................9
Mounting:
Keyhole locations and dimensions .....................10
Removing steam cylinder .............................11
Wall mounting humidifier ............................11
Fill cup extension kit ...................................12
Steam cylinder.........................................13
Piping:
Supply water and drain ...............................14
Field piping overview ................................15
XT steam blowers....................................16
Humidifier wiring .....................................17
Sensor placement ......................................19
Dispersion:
Selecting the dispersion assembly location ..............20
Returning condensate to steam cylinder ................21
Condensate return guidelines............................21
Steam outlet connections,
Models 002 through 025 ..............................22
Steam outlet connections with hose,
Models 033 through 083 ..............................23
Interconnecting piping requirements
Condensate control and collection ..................24
Connecting to humidifier with steam hose ...........25
Single dispersion tube
Dispersion tube with or without condensate drain ....26
Dispersion tube without condensate drain,
XT Models 002, 003, and 006.......................26
Dispersion tube with condensate drain,
XT Models 002 through 017 .......................27
Drip tee installation ..................................28
Connecting to humidifier with tubing or pipe ...........29
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Rapid-sorb®.........................................30
Rapid-sorb with models 025 through 042 ...............32
Rapid-sorb with Models 050 through 083 ...............33
With header outside of duct for horizontal airflow ....34
With header inside of duct for horizontal airflow .....34
Steam supply connections to Rapid-sorb header ......36
Condensate drain connections to Rapid-sorb header . . 36
Ultra-sorb®Model LV ................................36
XT steam blowers....................................37
Mounting XT steam blower on top of humidifier .....39
Remote mounting XT steam blower.................40
Wiring XT steam blowers..........................41
Piping condensate to humidifier fill cup .............41
Piping condensate to drain.........................41
Operation
Principle of operation ..................................42
Start-up checklist ......................................44
Control panel, Model XTS ..............................45
Start-up procedure, Model XTS..........................46
Start-up procedure, Model XTP..........................47
Maintenance
Shutdown procedure ...................................48
Scheduled maintenance ................................48
Steam cylinder service life...............................48
Cool-down procedure
Model XTS .........................................48
Model XTP .........................................48
Replacing steam cylinder................................49
Drain valve............................................50
Troubleshooting
Model XTS .........................................51
Model XTP .........................................51
DRI-STEEM Technical Support .........................51
Replacement parts:
XTS/XTP Models 002 through 042.....................54
XTP Models 050 through 083 .........................56
Steam blowers.......................................58
Warranty .................................... Back cover

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Note: See detailed installation drawing on Page 15
and detailed principle of operation on Page 42.
Figure 2-1:
XT Series humidifier
OM-7661X
DRI-STEEM XT Series electrode steam humidifiers use heat caused
by electrical resistance in their fill water to boil the water into
humidification steam. Steam output and water conductivity are
managed via automatic draining and filling. See the components
and operation summary in Figure 2-1.
Steam to duct or
XT steam blower
(see dispersion
options on Page 8)
Electrodes
Electrical resistance
in fill water
Overflow to drainSupply water connection
Control panel for
on-board controller
(see Figure 3-1)
Steam cylinder
High water sensor
Fill hose
Overflow
hose
Cylinder drain
Fill cup
Download DRI-STEEM literature
DRI-STEEM product manuals can be
downloaded, printed, and ordered from our
website: www.dristeem.com

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Figure 3-1:
XT Series humidifier control panels
Model XTP Vapor-logic4 keypad/displayModel XTS standard controller keypad
LED indicators
On-off / function
selection button
Fill
Steam
Drain
Service
Softkeys for direct menu
access
Navigation buttons for item
selection
System alarms
Cylinder status
Set point
System messages
Mode
Room RH
Output
Supply water
There are benefits and trade-offs to consider when the application
allows a choice between hard and softened water:
Hard water: The benefit of hard water is less frequent draining
and filling than with soft water, which results in better energy
and water efficiency and more consistent steam output.
However, cylinder replacement could be more frequent with
hard water, because hard water scale coats the electrodes. The
harder the water, the more frequent the need for a new cylinder.
Softened water: The benefit of softened water is longer cylinder
life (depending on water chemistry) than with hard water,
because softened water does not coat the electrodes nearly
as much as hard water. However, softened water ions stay in
solution to much higher concentrations than hard water ions.
This requires more frequent draining and filling, which results
in less energy and water efficiency and less consistent steam
output.
Controller
The standard controller in Model XTS humidifiers features
push-button operation, with indicators for operating status and
troubleshooting information. See “Operation” beginning on Page
42 for details.
The Vapor-logic4 controller in Model XTP humidifiers features
menus for all humidifier functions, with a Web interface for access
to all functions via Ethernet.
Recommended supply water conductivity for
DRI-STEEM electrode humidifiers is 125 to 1250
μS/cm (roughly comparable to water hardness of
3 to 36 grains per gallon).
Demineralized, deionized, and reverse-osmosis
water cannot be used. These water types are not
conductive enough for electrode humidifiers.
The
Vapor-logic
®
4 Installation and Operation
Manual
ships with Model XTP humidifiers.
It is a comprehensive manual. Refer to it for
information about the keypad/display and Web
interface, and for troubleshooting information.
Controller on-off switch* Controller on-off switch*
* On-off switch for control board — not a safety shut-off to humidifier power wiring.

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Table 4-1:
XT Series humidifier technical data
XTS / XTP
model*
Input
power
(kW)
Nominal steam
capacity
Nominal current draw (amps) **
Single-phase Three-phase
lbs/hr kg/h 230V 400V 400V
002 1.7 5 2 7 — —
003 3.3 10 5 15 8 5
006 6.0 20 8 26 15 9
010 10.0 30 14 — — 14
017 16.5 50 22 — — 24
025 25.0 75 34 — — 36
033 33.3 100 45 — — 48
042 41.7 125 57 — — 60
050*** 50.0 150 68 — — 2 x 36
067*** 66.7 200 91 — — 2 x 48
083*** 83.3 250 113 — — 2 x 60
*XTS models include standard controller.
XTP models include Vapor-logic4 controller.
** For circuit protection requirements, see Table 5-1.
*** Model XTP only. These models have two steam cylinders and require
independent service connections.

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Table 5-1:
Line currents and recommended fusing for XT Series humidifiers
XTS / XTP
model kW Phase Volts Maximum line current (amps) Recommended fusing (amps)
002 1.7 1 230 9 13
003 3.3
1400 10 15
3400 6 10
006 6.0
1400 18 25
3400 10 13
010 10.0 3 400 17 25
017 16.5 3 400 29 40
025 25.0 3 400 43 63
033 33.3 3 400 58 80
042 41.7 3 400 72 100
050* 50.0 3 400 2 x 43 2 x 63
067* 66.7 3 400 2 x 58 2 x 80
083* 91.7 3 400 2 x 72 2 x 100
*Model XTP only. These models have two steam cylinders and require independent service connections.
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Figure 6-1:
XT Series humidifier dimensional drawings
Notes:
*Fill cup extension kit is required and ships with Models 025 through 083 (ships loose). It is also required for Models 010 and 017 if maximum developed
length of steam tubing is more than 20' (6 m) and duct static pressure exceeds 2" wc (498 Pa), and all XT Series humidifiers using Rapid-sorb or Ultra-sorb.
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Model XTS / XTP 002 through 042
E
D
Electrical knockout
Top
Bottom
Front
Drain outlet
Electrical knockouts
Supply water
connection
B
OM-7672
10.0
(254)
Fill cup extension kit*
OM-7673
D
B
E
F
Model XTP 050 through 083
10.0
(254)
21.0 (533)
Dispersion outlets
Drain outlets
Supply water connections
Fill cup extension kits*
A
A
C
C
F
Front
Top
Bottom
Electrical knockout
Dispersion outlet
E
E
Electrical
knockouts
21.0 (533)
15.1 (384)
D
D
G
G
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Table 7-1:
Dimensions by model number
Dimension Description
XTS / XTP model
002, 003, 006 010, 017 025, 033, 042 050*, 067*, 083*
inches mm inches mm inches mm inches mm
ACabinet width 14.6 370 17.7 450 19.9 504 39.6 1005
BCabinet height 20.6 523 22.1 561 23.6 599 23.6 600
CCabinet depth 8.7 221 11.8 300 13.4 340 13.4 340
DCabinet back edge to steam/drain outlet centers 4.5 114 6.0 152 6.7 170 6.7 170
ECabinet left edge to steam/drain outlet centers 4.4 112 6.0 152 7.0 178 7.0 178
FCabinet back edge to supply water connection
center 6.7 170 9.5 241 11.1 282 11.1 282
GCabinet left edge to supply water connection
center 1.0 25 1.0 25 1.1 28 1.1 28
* Model XTP only
Table 7-2:
Weights by model number
XTS / XTP model
002, 003 006 010, 017 025, 033, 042 050*, 067*, 083*
lbs kg lbs kg lbs kg lbs kg lbs kg
Shipping weight 37 17 37 17 48 22 61 28 135 62
Maximum operating weight 38 17 46 21 77 35 112 51 215 98
* Model XTP only
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The duct dispersion options in Figure 8-1 and the open space
dispersion options in Figure 8-2 are available for XT Series
humidifiers. For installation details, see “Dispersion” beginning on
Page 20.
Figure 8-1:
XT Series humidifier duct dispersion options
OM-7667
OM-7669
Figure 8-2:
XT steam blowers
Mounted on top of humidifier
Mounted up to 10' (3 m) away from humidifier
OM-7670
OM-7598
OM-7668
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Ultra-sorb
Rapid-sorb
Single dispersion tube
Note: Models 010 and larger require
condensate drain. See Page 27.

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Important:
Install humidifier only in locations that meet the
following temperature and relative humidity (RH)
requirements:
Maximum ambient temperature:
104 °F (40 °C)
Minimum ambient temperature:
41 °F (5 °C)
Maximum ambient humidity:
80% RH (non-condensing)
Humidifier
When selecting a location for the humidifier, consider the
following:
t Proximity to the duct
Install the humidifier near the air duct system where
the dispersion assembly will be located. The maximum
recommended length for steam hose connecting a single
humidifier to a dispersion assembly is 10' (3 m). The maximum
recommended developed length for tubing or pipe connecting a
single humidifier to a dispersion assembly is 20' (6 m).
For more information about installing dispersion assemblies, see
“Dispersion” beginning on Page 20.
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The recommended installation location for the dispersion
assembly is at an elevation higher than the humidifier. However,
if the dispersion assembly must be installed at an elevation
lower than the humidifier, install a drip tee and drain. See “Drip
tee installation” on Page 28.
Before installing a dispersion assembly or interconnecting
piping, review all pitch requirements in the “Dispersion” section
of this manual.
t 3FRVJSFEDMFBSBODFT (see Figure 9-1)
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Electrical power supply connections are at the lower or upper
right rear corner of the unit. See “Humidifier wiring” on Pages
17 and 18.
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Water supply piping and drain connections are at the bottom of
the cabinet. See “Piping” on Page 14.
t &YUFSJPSXBMMJOTVMBUJPO
Install the humidifier on an exterior wall only if the wall is
properly insulated.
Dispersion control devices
See Figure 19-1 for recommended installation locations for the
dispersion assembly and associated control devices.
Installation
Staging multiple XT Series humidifiers
Up to four XT Series humidifiers can be staged
to operate in sequence. In a sequenced
application, one control input signal is divided
into user-selectable control input signals for the
connected humidifiers. See the
Vapor-logic4
Installation and Operation Manual
for
instructions on staging multiple humidifiers.
Figure 9-1:
XT Series humidifier recommended
minimum clearances
16" (400 mm)
15" (380 mm)
3" (76 mm)
between units
3"
(76 mm)
36" (914 mm)
front clearance
OM-7664

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Figure 10-1:
XT Series humidifier mounting keyhole locations
B
D
C
A
E
OM-7663OM-7662
A
B
C
Models 002 through 042 Models 050 through 083
A
D
Table 10-1:
XT Series humidifier mounting keyhole dimensions
Dimension
XTS / XTP model
002, 003, 006 010, 017 025, 033, 042 050*, 067*, 083*
inches mm inches mm inches mm inches mm
A 3.9 100 7.1 180 7.5 190 7.5 190
B 14.0 355 16.3 415 18.9 480 18.9 480
C 3.0 75 3.6 92 3.4 86 3.3 83
D 3.1 79 3.4 85 3.1 79 3.1 77
E ——————6.5165
* Model XTP only
Installation

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Installation
Unpack the humidifier from the shipping carton, and remove the
cabinet doors and steam cylinder.
Removing steam cylinder
Make sure the cylinder is empty and cooled before removing it.
1. Disconnect electrode and high water sensor connectors from
steam cylinder.
2. Place hands palms-down below cylinder on both sides of drain
outlet.
3. Press up against bottom of cylinder with backs of hands while
pressing down against cabinet floor with fingers.
4. Raise cylinder until drain outlet clears drain valve body, and
remove cylinder from cabinet.
Wall mounting humidifier
Mount the humidifier level and plumb, using the lag bolts provided.
Follow the instructions below for mounting on a wood stud wall.
1. Mount spanner boards on wall, spanning at least two studs.
Position one board at top of cabinet (for the lag bolts), and
other board at bottom of cabinet.
2. Predrill pilot holes in spanner boards, and secure humidifier to
spanner boards with lag bolts.
Note: Use the appropriate mounting methods and mounting
hardware for other wall types.
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WARNING
Mounting hazard
Mount humidifier per the instructions
in this manual and to a structurally
stable surface. Improper mounting of
the humidifier can cause it to fall or tip,
resulting in severe personal injury or
death.
mc_060110_1540

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Installation
Figure 12-1:
Fill cup extension kit
A fill cup extension (Figure 12-1) is required for any of the following:
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t .PEFMTBOEif maximum developed length of steam
tubing is more than 20' (6 m), and duct static pressure exceeds
2" wc (498 Pa)
mc_110110_1455
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OM-7690
Fill valve adapter
Overflow elbow
Drain cup plate
Supply water hose (A)
Cylinder fill hose (B)
Overflow hose (C)
Fill cup
(see inset below)
OM-7629
Cylinder fill (B)
Supply water (A) Overflow (C)
Fill cup
Cylinder fill hose connection
Removing existing fill cup: Models 002 through 017
If installing a fill cup extension kit for Models 002 through 017, first
remove the existing fill cup as follows:
1. Remove steam cylinder from XT cabinet (if not already out).
2. Expand spring clamps and slide them up cylinder fill hose and
supply water hose, and disconnect hoses from cylinder fill hose
connection and fill valve adapter.
3. Disconnect overflow hose from overflow elbow.
4. Remove fill cup and hoses (fill cup is press fit into top of XT
cabinet).
Installing fill cup extension kit: all XT models
1. Remove steam cylinder(s) from XT cabinet (if not already out).
2. Route fill cup extension kit hoses into cabinet through fill cup
hole, and fasten extension bracket as shown with two screws
provided.
3. Cut supply water hose (small-diameter hose) (A) to length so it
can attach to fill valve adapter without kinking.
4. Expand spring clamp and slide it onto supply water hose (A)
far enough so it will not interfere, then push hose onto fill valve
adapter. Expand and slide spring clamp into place.
5. Cut cylinder fill hose (bottom, center hose) (B) to length so it
can attach to cylinder fill hose connection without kinking.
6. Expand spring clamp and slide it onto cylinder fill hose (B) far
enough so it will not interfere, then push hose onto cylinder fill
hose connection. Expand and slide spring clamp into place.
7. Cut overflow hose (C) to length so it can attach to overflow
elbow without kinking.
8. Push overflow hose onto overflow elbow. Spring clamp is not
required on this connection.

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Installation
Figure 13-2:
Steam cylinder installation
OM-7675X
Drain valve
body
Cylinder
guide
Installing steam cylinder
1. Make sure strainer is pressed into steam cylinder drain outlet
and strainer flange is flush with bottom of cylinder outlet. See
Figure 13-1.
2. Use water to lubricate drain outlet on bottom of cylinder and
o-ring in drain valve body. See Figure 13-2.
3. With Warning label on cylinder facing you, lower cylinder drain
outlet into drain valve body, and rotate cylinder so side tabs line
up with cylinder guides inside cabinet. Push down on cylinder
until drain outlet is fully seated in drain valve body.
4. Connect high water sensor (yellow) wire to single pin
surrounded by plastic shoulder on cylinder.
5. Connect electrode plugs to pins on cylinder. Make sure all plugs
fit snugly and are fully engaged on pins.
Note: If cylinder plugs become loose, obtain replacement plugs
from DRI-STEEM. See “Replacement parts” on Pages
55 and 57 for part numbers.
Important: Cylinders with six electrodes have color-coded
dots on the cylinder and color bands on the electrode plugs.
When connecting the plugs, match the band colors on the plugs
with the dot colors on the cylinder. Refer to the wiring diagram
shipped with the humidifier if necessary.
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Figure 13-1:
Steam cylinder installation
OM-7632
Strainer
High water
sensor pin

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Installation
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Figure 14-1:
Drain piping detail
OM-7591
* Hose clamp and black rubber hose ship with each
humidifier; they can also be ordered from DRI-STEEM.
See Table 59-1.
Important: Thoroughly flush the
supply water piping to remove pipe residue
and stagnant water before connecting piping
to the humidifier. Pipe residue and stagnant
water in the water supply piping can cause
foaming, preventing the humidifier from
reaching the required steam capacity.
WARNING
Hot drain pipes
Drain piping surface may be hot. Touching
or contact with hot pipe may cause severe
personal injury.
Black rubber hose*
3/4" (DN20) I.D.
Open drain
1" (25 mm)
air gap
Pitch 1/8"/ft (1%) toward drain
Hose clamp*
To drain
Supply water piping
Use only copper for supply water piping; do not use rubber or
plastic. The standard supply water connection before the fill valve is
a 1/4" FIP strainer.
Note: The supply water connection size is 3/8"BSP [DN10] in Europe.
In cases where water hammer may be a possibility, consider
installing a shock arrestor. Water pressure must be 25 to 80 psi
(175 to 550 kPa).
Drain piping
Drain piping must be code-approved, 3/4" (DN 20) ID material
rated for 212 °F (100°C) minimum.
The drain cup has an integral grounding plate and requires a field-
installed 1" (25 mm) air gap to a drain funnel to prevent conduction
of electricity in the drain line.
The XT Series humidifier features user-selectable drain water
tempering. When drain water tempering is selected, the humidifier
tempers drain water by opening the fill valve whenever the drain
valve is energized, which automatically cools drain water before it
enters the drain. Drain water tempering is intended to keep water
entering the drain line no hotter than 140°F (60°C). Manually
energizing the drain valve when the supply water is shut off can
allow 212 °F (100 °C) water to enter the drain line.
Observe following precautions when selecting and installing drain
piping to ensure personal safety and material integrity:
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drain piping to the earth ground lug in the XT Series humidifier.
The earth ground lug is shown in Figures 54-1 and 56-1.
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alternative for drain piping. It is rated up to 212°F (100°C) for
intermittent-use, low-pressure applications.
The connection size for the steam cylinder drain is 1" (DN25) hose.
Do not reduce this connection size.
If drainage by gravity is not possible, use a reservoir pump rated for
212 °F (100 °C) water.
A drain hose is provided to function as the flexible connection from
the drain cup to the field-installed open drain. See Figure 14-1.

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Installation
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Figure 15-1:
XT Series humidifier field piping overview
OM-7666
Install plumb
3/4” (DN20) drain piping up
to second drain connection
Supply valve, by installer
Hose and clamp
Inlet strainer, by installer
Note: Dashed lines indicate provided by installer.
Shock arrester (by installer)
recommended to reduce
water hammer
Floor drain
Open drains required directly
below humidifier drains to prevent
downstream drain line blockage from
causing water to back up into cylinder.
Refer to governing codes for drain pipe
size and maximum discharge water
temperature. Install spill funnels plumb
to floor drain.
Metallic water supply line
3/8” (DN10) copper water supply line; water pressure must be 25 to 80 psi (175 to 550 kPa).
Fill valve with 1/4” FIP strainer
(3/8"BSP [DN10] in Europe)
supply water connection
1¼” (DN32) drain piping after
second drain connection, or if
piping run is over 10’ (3 m)
1” (25 mm) air gap required to isolate
unit drain piping from sanitary drain
piping. Locate air gap only in spaces
with adequate temperature and air
movement to absorb flash steam, or
condensing on nearby surfaces could
occur.
Steam hose, tubing, or pipe. DRI-STEEM recommends tubing
or pipe for runs longer than 10’ (3 m). See Table 24-2 for
maximum piping lengths. Tubing or pipe must be grounded.
Pitch 1/8”/ft (1%) toward drain
Two-cylinder model shown

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Installation
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Figure 16-1:
Piping from XT Series humidifier to XT steam blower
XT steam blower mounted directly
on top of XT Series humidifier
Hose clamp (provided)
Hose clamp (provided)
Steam hose (provided)
OM-7682
Notes:
tModels XTS / XTP 025 and 033 are not intended for
use with a direct-mounted steam blower.
tModel XTS / XTP 042 is not intended for use with a
steam blower.
Remote-mounted XT steam blower
Plastic tie
Condensate hose
(purchased separately
from DRI-STEEM)
Plastic tie
Hose clamp (provided)
Steam hose (purchased
separately from
DRI-STEEM)
Hose clamp (provided)
To open drain or humidifier fill cup
Water seal is required, whether condensate is piped to
open drain or returned to humidifier fill cup.
OM-7681
7” (178 mm)
water seal
Maximum recommended distance between
humidifier and XT steam blower is 10’ (3 m).