DriSteem STS Installation Manual

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STS

Steam-to-Steam Humidifier

Installation, Operation, and Maintenance Manual

WARNINGS AND CAUTIONS

Warnings and cautions

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.

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 and in compliance with local, state, federal, and governing codes. Improper installation can cause property damage, severe personal injury, or death as a result of electric shock, burns, or ﬁre.

DriSteem

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.

mc_011909_1215

technical support: 800-328-4447

Hot surfaces and hot water

This steam humidiﬁcation system has extremely hot surfaces. Water in tank, 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.

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STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Warnings and cautions

WARNING

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 open control cabinet door or remove subpanel access panels until electrical power is disconnected.

Follow the shutdown procedure below before performing service or maintenance procedures on any part of the system.

Shutdown procedure

To prevent serious injury, follow this shutdown procedure before performing service or maintenance procedures on this humidiﬁer, after the tank has cooled down and drained.

1. Follow the “Cool down humidiﬁer” instructions on Page 50 (tap/softened water STS) or Page 53 (STS with RO/DI water option) to put the humidiﬁer at a safe temperature for service.

2. Use the Vapor-logic

3. Place all power disconnects in OFF position and lock in OFF position.

4. Close the ﬁeld-installed manual water supply shut-off valve.

5. Close the manual shut-off valve on the inlet steam supply.

keypad/display to change control mode to Standby.

CAUTION

Hot discharge water

Discharge water can be as hot as 212 °F (100 °C) and can damage the drain plumbing.

Humidiﬁers equipped with a water tempering device need fresh make-up water in order to function properly. Make sure the water supply to the water tempering device remains open during draining.

If the humidiﬁer is not equipped with a water tempering device, allow the tank to cool before opening the drain valve.

Excessive supply water pressure

Supply water pressure greater than 80 psi (550 kPa) can cause the humidiﬁer to overﬂow.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

iii

Table of contents

WARNINGS AND CAUTIONS ...................................................ii

OVERVIEW.................................................................2

Product overview ........................................2

Tap/softened water ....................................2

RO/DI water option ...................................2

Water type conversion .................................2

Dimensions ............................................4

Capacities, electrical specifications, and weights ..................6

INSTALLATION ..............................................................7

Selecting a location ......................................7

Mounting methods .......................................8

Mounting the humidifier ...................................9

Support legs ........................................9

Wall brackets ........................................9

H-legs .............................................9

Trapeze hanger ......................................9

Weather cover .........................................10

Outdoor Enclosure ......................................12

Electrical specifications .................................13

Mounting ..........................................15

STS Outdoor Enclosure sequence of operation ................17

Alternate water seal and drain valve piping ..................18

Piping: ...............................................18

Drain ............................................18

Fill ...............................................20

Tap/softened water, one heat exchanger ...................22

Tap/softened water, two heat exchangers ...................23

RO/DI water option, one heat exchanger ...................24

RO/DI water option, two heat exchangers ..................25

Pressurized steam supply ...............................26

Humidification steam outlet .............................27

Wiring ..............................................28

Wiring diagram locations ..............................28

Electrical installation ..................................28

Wiring requirements ..................................28

Control wiring ......................................29

Grounding requirements ................................29

Sensor placement .......................................30

Dispersion: ............................................31

Selecting the dispersion assembly location ..................31

Interconnecting piping requirements .......................32

Drip tee installation ...................................34

Single tube and multiple tube ............................35

Rapid-sorb .........................................40

Ultra-sorb ..........................................46

Attention installer

Read this manual before installing. Leave manual with product owner.

Where to find more information

Our web site:

The following documents are available on our web site: www.dristeem.com

• Catalogs – STS – Ultra-sorb

• Installation, Operation, and Maintenance manuals (IOM)

– Ultra-sorb Models LV and LH – Ultra-sorb Model XV – Vapor-logic controller (includes humidiﬁer

operation and troubleshooting)

• DriSteem Humidiﬁcation System Design Guide (includes steam loss tables and general humidiﬁcation information)

DriCalc®:

DriCalc, our software for humidiﬁcation system sizing and selection, can be ordered at our web site. Also in Dri-calc:

• Library of installation guides

• Dispersion and sensor placement in ducts and air handlers

• Vertical airﬂows

Call us at 800-328-4447

Obtaining documents from our web site or from DriCalc is the quickest way to view our literature, or we will be happy to mail literature to you.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Table of contents

OPERATION ..............................................................47

Start-up procedure ......................................47

Start-up checklist ........................................48

MAINTENANCE ........................................................... 49

Water quality .........................................49

Tap/softened water ......................................50

RO/DI water option .....................................53

Outdoor enclosure ......................................55

REPLACEMENT PARTS ...................................................... 56

Humidifier tank ........................................56

Control cabinet ........................................58

Outdoor enclosure ......................................59

WARRANTY .............................................................. 60

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

OVERVIEW

Product overview

STS (steam-to-steam) humidiﬁers use pressurized boiler steam to heat clean ﬁll water into chemical-free steam for humidiﬁcation. See Figure 3-1.

STS humidiﬁers are designed for use with tap/softened water and are available with an option for RO/DI water (water that has been treated using reverse osmosis, or deionized water).

TAP/SOFTENED WATER

A conductivity probe (Figure 3-2) monitors the water level in the tap/softened water STS humidiﬁer; therefore, water conductivity must be at least 30 µS/ cm for proper operation. A tap/softened water STS humidiﬁer will not operate with RO/DI water. For RO/DI water, use STS with the RO/DI water option.

RO/DI WATER OPTION

STS humidiﬁers with the RO/DI water option control water level with a ﬂoat valve (Figure 3-3). Float valves are compatible with RO/DI water only.

Humidiﬁers with the RO/DI water option are virtually maintenance free and require little or no downtime.

WATER TYPE CONVERSION

STS tap/softened water humidiﬁers can be converted in the ﬁeld for use with RO/DI water, and STS RO/DI water humidiﬁers can be converted in the ﬁeld for use with tap/softened water. Contact your DriSteem representative or distributor for parts and instructions.

Supply water guidelines

Supply water quality is an important component of humidiﬁer reliability and maintenance.

Examples:

• Corrosive water can decrease the service

life of the humidifier.

• Excessive water hardness can increase the

humidifier maintenance requirements.

To maximize humidiﬁer service life and minimize humidiﬁer maintenance, DriSteem has established guidelines for supply water See Table 2-1.

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Table 2-1: DriSteem supply water guidelines

Chlorides*

RO or DI water Softened water Tap water

* Damage caused by

chloride corrosion is not covered by your DriSteem warranty.

Total hardness

Tap water < 500 ppm

< 5 ppm

< 25 ppm

< 50 ppm

RO, DI, or softened water Tap water

Silica < 15 ppm

You may wish to take action to mitigate potential negative effects to your humidiﬁer. Supply water outside of these guidelines may void your DriSteem warranty. Please contact your DriSteem Representative or DriSteem Technical Support if you need advice.

7 to 8

6.5 to 8.5

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Product overview

OVERVIEW

FIGURE 3-1: STS HUMIDIFIERS

Notes:

• Drain piping material must be suitable for 212 °F (100 °C) water.

• See the piping drawings on Pages 22 through 25.

Tap/softened water STS humidiﬁer

Humidiﬁcation steam outlet

Probe water level control

Automatic steam valve

Boiler steam

Steam trap

Condensate return

Water seal

Air gap

Open drain

Manual drain or optional motorized drain valve

STS humidiﬁer with the RO/DI water option

Humidiﬁcation steam outlet

Float valve water level control

OM-938

Heat exchanger

FIGURE 3-2: WATER LEVEL CONTROL FOR TAP/SOFTENED WATER HUMIDIFIER

Fill valve closes when water level rises to this probe.

Fill valve opens when water level is below this probe.

Low-water cutoff. Pressurized steam to heat exchanger is cut if water level drops below this probe (if steam to STS heat exchanger is controlled by Vapor-logic).

Humidiﬁers using tap or softened water control water levels electronically using a three-rod probe. The controller responds with the above actions when the water level reaches each rod.

VLC-OM-030

Automatic steam valve

Boiler steam

Steam trap

Condensate return

Water seal

Heat exchanger

Manual drain valve

Air gap

Open drain

OM-939

FIGURE 3-3: WATER LEVEL CONTROL FOR RO/DI-WATER OPTION HUMIDIFIER

Fill valve

Float rod

VLC-OM-026

Humidiﬁers using RO/DI water control water level using a ﬂoat valve. An optional low-water cutoff switch is available as a remote water indicator.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Float ball

OVERVIEW

Dimensions

FIGURE 4-1: DIMENSIONS, STS MODELS 25, 50, 100, 200, AND 400 (WITH COPPER OR STAINLESS STEEL HEAT EXCHANGERS)

Front view Side view

Mounting holes: Models 25–100: 5/16" (8 mm) slot Models 200 & 400: 1/2" (12 mm) slot

Notes:

• Tap/softened water model shown

• See dimensions in Tables 5-1 and 5-2

FIGURE 4-2: DIMENSIONS, STS MODEL 800 (WITH COPPER OR STAINLESS STEEL HEAT EXCHANGERS)

Front view

OM-931

Side view

Mounting hole: 1/2" dia. (12 mm) slot

OM-932

Notes:

• Tap/softened water model shown

• See dimensions in Tables 5-1 and 5-2

OM-936

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

OVERVIEW

Dimensions

Table 5-1: Dimensions, STS with copper heat exchangers

See drawings in Figures 4-1 and 4-2

Description

A Height** 19.50 495 19.50 495 19.50 495 19.50 495 29.75 756

B Width 14.75 375 14.75 375 19.25 489 30.25 768 30.25 768

C Length 23.65 600 39.65 1007 39.65 1007 55.15 1401 55.15 1401

D Bottom to supply inlet of ﬁrst heat exchanger 6.63 168 6.63 168 6.63 168 6.63 168 6.63 168

E Bottom to return outlet of ﬁrst heat exchanger 3.63 92 3.63 92 3.63 92 3.63 92 3.63 92

F Bottom to supply inlet of second heat exchanger — — — — — — — — 14.28 363

G Bottom to return outlet of second heat exchanger — — — — — — — — 11.24 285

H Side to heat exchanger 3.25 83 3.25 83 3.25 83 3.25 83 3.25 83

J Pressurized steam supply inlet

K Pressurized condensate return outlet

L Side to steam outlet 6.25 159 8.63 219 9.63 245 13.00 330 13.00 330

M Front to steam outlet 2.50 64 2.25 57 2.75 70 3.75 95 3.75 95

* C, S, and SNC in model numbers are explained in Table 6-1. ** Add 23.5" (597 mm) to overall height when STS is mounted on four support legs. Add 22.5" (572 mm) to overall height when STS is mounted

on two H-legs.

25C 50C 100C 400C 800C

inches mm inches mm inches mm inches mm inches mm

3/4" p ip e

thread

3/4" p ip e

thread

DN20

1¼" pipe

thread

3/4" p ip e

thread

DN32

DN20

STS model*

1¼" pipe

thread

1¼" pipe

thread

DN32

1½" pipe

thread

1¼" pipe

thread

DN40

DN32

1½" pipe

thread

1¼" pipe

thread

DN40

DN32

Table 5-2: Dimensions, STS with stainless steel heat exchangers

See drawings in Figures 4-1 and

A Height** 19.50 495 19.50 495 19.50 495 19.50 495 19.50 495 29.75 756

B Width 14.75 375 14.75 375 19.25 489 30.25 768 30.25 768 30.25 768

C Length 23.65 600 39.65 1007 39.65 1007 55.15 1401 55.15 1401 55.15 1401

Bottom to supply inlet of ﬁrst heat

exchanger

Bottom to return outlet of ﬁrst heat

exchanger

Bottom to supply inlet of second

heat exchanger

Bottom to return outlet of second

heat exchanger

H Side to heat exchanger 3.25 83 3.25 83 3.25 83 3.25 83 3.25 83 3.25 83

J Pressurized steam supply inlet

K Pressurized condensate return outlet

L Side to steam outlet 6.25 159 8.63 219 9.63 245 13.00 330 13.00 330 13.00 330

M Front to steam outlet 2.50 64 2.25 57 2.75 70 3.75 95 3.75 95 3.75 95

* C, S, and SNC in model numbers are explained in Table 6-1. ** Add 23.5" (597 mm) to overall height when STS is mounted on four support legs. Add 22.5" (572 mm) to overall height when STS is mounted

on two H-legs.

Description

4-2

25S 50S 100S 200S 400SNC 800SNC

inches mm inches mm inches mm inches mm inches mm inches mm

6.85 174 6.85 174 6.85 174 6.85 174 6.85 174 6.85 174

3.35 85 3.35 85 3.35 85 3.35 85 3.35 85 3.35 85

— — — — — — — — — — 14.5 368

— — — — — — — — — — 11.0 279

3/4" pi pe

thread

3/4" pi pe

thread

DN20

1" pipe

thread

3/4" pi pe

thread

DN25

DN20

1" pipe

thread

3/4" pi pe

thread

STS model*

DN25

DN20

1½" pipe

thread

3/4" pi pe

thread

DN40

DN20

1½" pipe

thread

3/4" pi pe

thread

DN40

DN20

1½" pipe

thread

3/4" pi pe

thread

DN40

DN20

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

OVERVIEW

Capacities, electrical speciﬁcations, and weights

Table 6-1: STS humidifier models and capacities with copper heat exchangers

Steam pressure at connection to STS steam valve (valve provided by DriSteem)

STS models

25C 20 9 70 32 100 45 120 54

50C 50 23 150 68 200 91 240 109

100C 100 45 300 136 400 181 480 218

400C 300 136 580 263 720 327 790 358

800C 650 295 1275 578 1500 680 1600 726

Table 6-2: STS humidifier models and capacities with stainless steel heat exchangers

STS models

25S 10 5 25 11 30 14 35 16

50S 30 14 55 25 75 34 80 36

100S 60 27 110 50 140 64 150 68

200S 150 68 290 132 360 163 390 177

400SNC 170 77 392 178 552 250 637 289

800SNC 212 96 825 374 1095 497 1223 555

5 psi (34 kPa) 10 psi (69 kPa) 13 psi (90 kPa) 15 psi (103 kPa)

lbs/hr kg/h lbs/hr kg/h lbs/hr kg/h lbs/hr kg/h

Steam pressure at connection to STS steam valve (valve provided by DriSteem)

5 psi (34 kPa) 10 psi (69 kPa) 13 psi (90 kPa) 15 psi (103 kPa)

lbs/hr kg/h lbs/hr kg/h lbs/hr kg/h lbs/hr kg/h

For use with tap/softened or RO/DI water:

• STS models ending in C (copper heat exchangers with a nickel coating)

• STS models ending in S (stainless steel heat exchangers with a Teﬂon coating)

For use with RO/DI water option only:

STS models ending in SNC (stainless steel heat exchangers with no coating)

Table 6-3: STS humidifier weights

STS model

25 95 43 175 79

50 125 57 336 152

100 139 63 350 159

200 245 111 850 386

400 320 145 950 431

800 410 186 1450 658

* Operating weight does not include weight of interconnecting piping provided by installer.

Shipping weight Operating weight*

lbs kg lbs kg

Table 6-4: STS humidifier electrical specifications

North America 120 V single phase max 3 amps

Europe 230 V single phase max 3 amps

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Selecting a location

When selecting the location of the humidiﬁer, consider the following:

• Maximum ambient temperature for control cabinet is 104 °F (40 °C).

• Noises inherent to operation such as STS water ﬁll cycles

• Easy access for maintenance

• Critical service and maintenance clearances around humidiﬁer — primarily top, left side, and front (see Figure 7-1).

• Convenient location to dispersion system for routing of steam hose or tubing

• Electrical connections — power, control, and safety circuits

• Steam supply piping connections — inlet steam piping, condensate piping, and optional equipment (see Figure 26-1)

• Plumbing connections — supply water, drain piping, and condensate return piping

• Water seal requirements

INSTALLATION

• Avoid locations above critical equipment or processes to avoid damage to the equipment below in the event of a water leak.

• Avoid locations close to sources of electromagnetic emissions such as power distribution transformers and high horsepower motors controlled by variable frequency drives.

FIGURE 7-1: RECOMMENDED CLEARANCES

* Minimum access clearance of 18" (457 mm) recommended for periodic removal of top cover

for access to tank.

Left side: 36" (914 mm) with mounted control cabinet. 6"(152) without mounted control cabinet

Tap/softened water model shown

Front: 36" (914 mm)

Top: 18" (457 mm)*

Rear: 6" (152 mm)

DC-1452

Right side:

6" (152 mm) Bottom: 24" (610 mm)

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Mounting methods

FIGURE 8-1: SUPPORT LEGS, STS MODELS 25, 50, AND 100 ONLY

Tap/softened water model shown

Optional set of four legs and hardware

OM-933

FIGURE 8-3: WALL BRACKETS, STS MODELS 25, 50, AND 100 ONLY

DC-1454

DriSteem optional wall brackets (two required)

Tap/softened water model shown

STS model

25 and 50 15.5 394 24 610

100 21 533 30 762

A B

in. mm in. mm

FIGURE 8-2: TRAPEZE HANGER, STS MODELS 25, 50, AND 100 ONLY

See Note 1 Provide 18" (457 mm) minimum clearance above cover

1¼" (DN32) minimum

Tap/softened water model shown

Notes:

1. Secure rods to overhead construction.

2. 3/8" (M10) threaded rod of length required.

3. Angle or channel sized to properly support

humidiﬁer.

4. Humidiﬁer drain to appropriate building

waste. Do not drain humidiﬁer directly into drip pan. Install water seal as shown on Pages 22 through 25.

5. Drip pan (by installer) recommended in

overhead installations to prevent possible water damage to equipment below.

DC-1453

See Note 5

See Note 2

See Note 3

See Note 4

25%

larger than

humidiﬁer

FIGURE 8-4: H-LEGS, STS MODELS 200, 400, AND 800 ONLY

Tap/softened water model shown

Due to size and weight, STS models 200, 400, and 800 must be mounted on H-legs.

OM-947

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Mounting the humidiﬁer

INSTALLATION

The STS humidiﬁer tank must be level from side to side and front to back. For all mounting methods, shim and adjust when mounting, and verify that tank is level after it is ﬁlled and at operating weight.

SUPPORT LEGS

See Figure 8-1. Use the enclosed bolts, nuts, and washers to fasten the legs to the tank.

WALL BRACKETS

See Figure 8-3. DriSteem does not recommend mounting STS model 200, 400, or 800 with wall brackets. DriSteem recommends using 3/8" (M10) fasteners.

• Concrete or block wall: Use concrete anchors (expansion bolts) rated for the

operating weight of the STS humidiﬁer. Position the wall brackets so they are ﬂush with the front and back ﬂanges of the tank.

• Wood stud wall: Mount two horizontal 2 × 4 boards

(100 mm × 50 mm timbers) 16" (404 mm) on center:

– STS 25: Lag bolt (coach screw) the 2 × 4s to two studs. – STS 50: Lag bolt the 2 x 4s to three studs. – STS 100: Lag bolt the 2 x 4s to four studs.

Lag bolt the wall brackets to the horizontal 2 × 4s. Position the wall brackets

ﬂush with front and back ﬂanges of tank.

Important:

Installation must comply with local governing codes.

These mounting methods are the only options available to maintain compliance to the UL 998 standard. Alternate mounting methods will compromise the humidiﬁer’s CE, ETL, and C-ETL approval.

Support legs, trapeze hanger, and wall brackets are not available for STS models 200, 400, and 800.

Table 9-1: STS mounting options

Mounting

method

Trapeze hanger standard —

H-legs — standard

Support legs optional —

Wall brackets optional —

25, 50, 100 200, 400, 800

STS model

• Metal stud wall: Follow the wood stud wall guidelines above, but provide

a second set of 2 × 4s (100 mm × 50 mm timbers) on the backside of the wall. Run bolts with washers through the face 2 × 4, through each metal stud, and through the backside 2 × 4. Fasten the bolts and the face and backside 2 x 4s to the wall with washers and nuts.

H-LEGS

See Figure 8-4. With the STS tank securely held in place above the ﬂoor, attach front and rear supports using the supplied 3/8" (M10) bolts, nuts, and washers. Make sure the bottom of the tank is supported by the H -leg supports; this can be accomplished by having the bolts slightly loose as the unit is lowered to the ﬂoor, then tighten them after the unit is place.

TRAPEZE HANGER

See Figure 8-2. Secure the threaded rods to an overhead structure strong enough to support the operating weight of the humidiﬁer, ﬁeld-installed piping, and (if mounted on the humidiﬁer) control cabinet.

For overhead installations, install a drip pan to prevent possible damage to equipment below in the event of a water leak.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Weather cover

FIGURE 10-1: WEATHER COVER EXPLODED VIEW

Panel

Hinged door

FIGURE 10-2: WEATHER COVER DIMENSIONS

Panel

OM-7466

Hinged door

Table 10-1: Weather cover weights

Weather cover size lbs kg

STS 25 to 100 425 193

STS 200 to 800 550 250

OM-7465

Table 10-2: Weather cover dimensions

Letter Description

A Height 62 1575 66 1676

B Length 43.5 1105 53 1346

C Width 62 1575 78.25 1988

D Distance from bottom 22 559 22 559

STS 25 to 100 STS 200 to 800

inches mm inches mm

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Weather cover

The optional STS weather cover is water-resistant and designed to protect an STS humidiﬁer from rain and sun. This weather cover has been tested and approved by ETL Testing Laboratories, Inc., and is listed to UL Standard 1995 and certiﬁed to CAN/CSA Standard C22.2 No. 236.

The weather cover is fully assembled at the DriSteem factory.

INSTALLATION NOTES

Open the hinged doors to make necessary connections to the humidiﬁer. Refer to the installation section of this manual for all electrical, supply water, and drain connection requirements.

INSTALLATION ISSUES SPECIFIC TO WEATHER COVER APPLICATIONS

• Installation must comply with all governing codes.

• The bottom of the weather cover is open to accommodate piping and electrical connections.

INSTALLATION

• Electrical connections must be made with approved, outdoor-rated, watertight conduit.

• Freeze protection must be provided on all water piping.

• Steam supply must be insulated.

• Avoid using steam hose in outdoor applications — the effects of ultraviolet rays will prematurely age the steam hose.

• Installer must drill a hole in weather cover for steam piping. Seal after making steam connection to maintain weather protection.

• The steam outlet must be isolated with a union to allow easy disconnection of the steam supply. This allows easy removal of the weather cover to access the STS for service and maintenance.

ANNUAL WEATHER COVER MAINTENANCE REQUIREMENTS

• Check all fasteners and verify they are secure.

• Check for any sign of leakage — trace back to origin and repair.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Outdoor Enclosure

FIGURE 12-1: OUTDOOR ENCLOSURE WITH STANDARD OR OPTIONAL STEAM OUTLET, ELEVATION VIEW

Standard steam outlet

Ventilation fans

STS humidiﬁer

Power block

See Note 2

Knockouts, 4" (102 mm) on center

Enclosure drain 1½" pipe thread (DN40) with male nipple

Notes:

1. The Outdoor Enclosure has two available steam distribution conﬁgurations. The standard conﬁguration has a steam outlet on the right side of the Outdoor Enclosure for connecting to steam dispersion unit piping. The optional internal steam distribution conﬁguration routes steam within the Outdoor Enclosure and down through the enclosure pipe chase into a building.

2. There are four knockouts located on the right and left side of the enclosure. Knockout sizes are 1½" (hole dia. 50 mm) for STS models 25-100, and 2" (hole dia. 63.5 mm) for STS models 200-800. Run the electrical power into the enclosure at these knockouts.

3. All piping from the STS unit to the steam outlet is stainless steel pipe. Depending on the application, tubing or DriSteem steam hose is recommended for interconnecting piping from steam outlet to dispersion assembly.

4. Install a riser trap in the branch line leading to the humidiﬁer.

5. The preferred location for the STS steam control valve is inside the Outdoor Enclosure. If one of these valves must be located inside the building, it must be located within 6' (1.8 m) of the humidiﬁer to reduce pressure drop.

6. See the dimensions in Table 13-1.

Optional steam outlet

6.5"

DC-1476

Pipe chase

Table 12-1: Outdoor Enclosure connection sizes

Description

Water makeup

(ﬁll)

Drain 3/4” (DN20) 1” (DN25)

Condensate

return

Steam outlet See Table 27-1.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

25 – 100 200 – 800

1/4” pipe thread (DN8) 1/4” pipe thread (DN8)

3/4” pipe thread (DN20) 3/4” pipe thread (DN20)

STS model

Table 12-2: Outdoor Enclosure weights

Shipping weight* Operating weight*

STS model

lbs kg lbs kg

25 600 272 680 308

50 625 284 840 381

100 640 290 860 390

200 1050 476 1650 748

400 1125 510 1750 794

800 1225 556 2250 1021

* Includes humidiﬁer

Outdoor Enclosure

FIGURE 13-1: OUTDOOR ENCLOSURE, TOP VIEW

Valve access door:

• Models 25-100 have one access door

• Models 200-800 have two access doors

Optional steam outlet (exits enclosure through pipe chase)

INSTALLATION

Valve access door

Pipe chase extending 1" (25 mm) above enclosure ﬂoor

Enclosure drain

Standard steam outlet (exits enclosure here)

STS humidiﬁer

DC-1478

Table 13-1: Outdoor Enclosure dimensions*

STS model

Item Description

A Enclosure height 56.00 1422 66.00 1676

B Enclosure width 36.00 914 46.00 1168

Pipe chase position

D 2.00 57 3.50 89

Pipe chase size

F 8.00 203 10.00 254

H 18.63 473 22.00 559

Steam pipe position

J 14.50 368 20.50 521

K 12.25 311 11.00 279

L Enclosure length 60.00 1524 78.00 1981

* See drawings in Figures 12-1 and 13-1.

25–100 200–800

inches mm inches mm

4.50 114 4.50 114

20.00 508 32.00 312

6.00 152 8.50 216

Valve section heater

Intake ventilation fan

Control panel

Control panel heater

Electrical and cleanout access door

Intake ventilation fan

Table 13-2: STS Outdoor Enclosure electrical

specifications

Outdoor

Enclosure

without

heater

package

Outdoor

Enclosure

with heater

package

ELECTRICAL SPECIFICATIONS

Voltage Current

120 Vac,

50/60 Hz

120 Vac,

50/60 Hz

3.5 A 10 A

13.5 A 20 A

Maximum disconnect

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Outdoor Enclosure

FIGURE 14-1: OUTDOOR ENCLOSURE INSTALLATION DETAIL

Normally closed ﬁll valve (by factory)

Make-up water supply piping (by installer) (See Note 2)

Open to drain

Vacuum breaker (by installer)

120 V from unit disconnect or other source (See Note 1)

Normally closed (fail closed) min 3/8" electric valve (by installer)

Domestic water, 80 psig (582 kPa) maximum

Open drain (See Note 4)

Notes:

1. Insulate supply water piping to avoid dripping from condensation. To ensure that water does not remain in the ﬁll line and freeze if there is a loss of power, DriSteem recommends ﬁeld installing additional valves upstream of the ﬁll valve in a conditioned space. Power these valves on the same circuit that supplies the STS (as shown above); if the power goes off, water drains out of the ﬁll line to prevent freezing.

2. Ensure that water lines are protected from freezing conditions.

• Install heat tracing and insulation on ﬁll piping inside the Outdoor Enclosure.

• In extreme or critical applications in which the unlikely event of a water leak could cause severe damage, DriSteem recommends a thermostat

with a remote sensor on the ﬁll line to cut power to the STS and safety valves to stop ﬁll water to the STS and drain the ﬁll piping when the temperature is below freezing.

3. DriSteem recommends copper or iron drain piping for Outdoor Enclosures. On a loss of power the tank water will drain, but not be cooled by the Drane-kooler because of the ﬁeld supplied safety shut-off valves. If it is critical to keep the Drane-kooler functional in the case of a power loss, disconnect the Drane-kooler and relocate it down inside the conditioned space of the building. Pipe the supply water for the Drane-kooler before the safety shut-off valves.

4. If copper or iron piping is used for both the ﬁll and drain piping, these drains may be tied together. Locate 1" air gap only in spaces with adequate temperature and air movement to absorb ﬂash steam; otherwise, condensation may form on nearby surfaces. Refer to governing codes for drain pipe size and maximum discharge water temperature.

Humidiﬁer

Roof decking

Drain line, min. 1½" electric valve (See Note 3)

Optional water seal (P-trap) drain line, min. 1½" (DN40) (See Note 3) Normally open (fail open) min 1/2" electric valve (by installer)

Open drain (See Note 4)

Disconnect (by installer); see Detail A

120V supply. Refer to Table 13-2 for electrical requirements.

OM-7558

Heated building interior

120 V

Disconnect box

Detail A

To valves (by installer) (See Note 1)

To STS humidiﬁer

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Outdoor Enclosure

FIGURE 15-1: STS OUTDOOR ENCLOSURE, TOP VIEW

Valve access door:

• Models 25-100 have one access door

• Models 200-800 have two access doors

Optional steam outlet (exits enclosure through pipe chase)

INSTALLATION

Valve access door

Pipe chase extending 1" (25 mm) above enclosure ﬂoor

Enclosure drain

Standard steam outlet (exits enclosure here)

STS humidiﬁer

MOUNTING

DC-1478

Intake ventilation fan

Control panel

Control panel heater

Intake ventilation fan

• Outdoor Enclosure must be level and positioned with enough clearance to open access doors.

• Verify that position of pad or curb properly supports Outdoor Enclosure, and that support structure dimensions coincide with unit dimensions.

• Locate unit so air intakes are not close to exhaust fan outlets, gasoline storage, or other contaminants that could potentially cause dangerous situations. Using or storing gasoline or other ﬂammable vapors and liquids in open containers in vicinity of Outdoor Enclosure is hazardous.

Valve section heater

Electrical and cleanout access door

Important note about STS Outdoor Enclosure installation

• Install a riser trap in the branch line leading to the humidiﬁer.

• The preferred location for the STS steam control valve is inside the Outdoor Enclosure. If one of these valves must be located inside the building, it must be located within 6' (1.8 m) of the humidiﬁer to reduce pressure drop.

• When located on roof, Outdoor Enclosure air intakes must be a minimum of 14" (356 mm) above roof to prevent intake of snow or splashed rain. Position Outdoor Enclosure so prevailing winds do not blow into air intakes.

• Remove all shipping brackets and other packaging prior to installing the unit.

• During transit, unloading, and setting of the unit, bolts and nuts may have become loosened. Check that all nuts are tightened.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Outdoor Enclosure

MOUNTING (CONTINUED)

• There are four knockouts on the right and left side of the enclosure. It is recommended that electrical power is run into enclosure at these knockouts.

• Outdoor Enclosure is designed for lifting by two methods:

– Preferred method of lifting is by forklift. This is only possible if the forks

extend across entire unit. Forks that do not extend across entire unit could cause tipping, resulting in unsafe conditions or damage to the unit.

– Alternative method of lifting is through unit’s channel base frame and/

or special lifting lug hooks installed on the unit. Use a load spreader of sufﬁcient width to ensure that lifting cables clear sides of unit. If such a spreader is not available, insert wood strips between cables and unit where necessary. All four lifting points must be used; they are marked “lift here” on the unit.

In both cases it must be lifted from the bottom base and kept level, and

it must not tip, fall, or twist. If unit is severely twisted during handling, permanent damage could occur. It is installer’s responsibility to verify handling equipment’s capability to safely handle Outdoor Enclosure.

• Outdoor Enclosure has two available steam distribution conﬁgurations:

– Standard conﬁguration is a steam outlet on one side of enclosure for

connecting to steam dispersion unit piping.

– Optional internal conﬁguration routes steam within Outdoor Enclosure

and down through pipe chase into building.

See the drawings beginning on Page 12.

FIGURE 16-1: OUTDOOR ENCLOSURE MOUNTING OPTIONS

Flush

DC-1110

Curb

OM-1095

14" (356 mm)

• Pipe chase is inside enclosure. Cover for pipe chase is provided to maintain proper pressure in enclosure if this opening is not utilized. However, it is recommended that this pipe chase be used for both supply water piping and drain piping, in which case pipe chase cover should be removed. Install insulation rated for 212 °F (100 °C) to completely ﬁll area around pipes to maintain proper enclosure pressure.

• When enclosure is pad mounted or when pipe chase cannot be used, supply water and drain piping can be run through the knockouts — preferably on side opposite utility connections.

• When ordered with heater package, two thermostat-controlled strip heaters are provided to keep enclosure at constant minimum temperature: one heater is in control cabinet section, and one heater is in front section.

• Enclosure drain is provided. In case of water leak, water will drain from enclosure through this drain.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Outdoor Enclosure

INSTALLATION

MOUNTING (CONTINUED)

• Keypad/display with standard 5' (1.5 m) cable ships mounted to subpanel in Outdoor Enclosure. Keypad/display must not come in contact with strip heaters or block intake ventilation hood.

• If constant monitoring of unit is desired, or if unit is located in a severe climate, a remote-mount keypad/display should be installed. Additional cable lengths up to 500 feet (152 m) are available as an option for this mounting conﬁguration.

• 16-gauge galvanized steel curbs (optional) are shipped unassembled for ease of transporting to roof; they include all hardware for bolt-together assembly, and all holes are matched before leaving factory. Curb must be a minimum of 14" (356 mm) high. One 2" × 1/2" closed-cell curb gasket with adhesive on one side is supplied with hardware. Gasket must be installed between top of curb and base surface of Outdoor Enclosure to prevent moisture from leaking into building from driving rain or melting snow. Installation drawing is included.

• All piping from humidiﬁer to steam outlet is stainless steel pipe. Depending on the application, tubing or DriSteem steam hose is recommended for interconnecting piping from steam outlet to dispersion assembly.

FIGURE 17-1: TYPICAL ROOFTOP INSTALLATION OVERVIEW

STS OUTDOOR ENCLOSURE SEQUENCE OF OPERATION

• Power is applied to Outdoor Enclosure:

• If ambient temperature in enclosure is below 50 °F (10 °C), the strip heaters power up. Strip heaters remain on until enclosure reaches 50 °F (10 °C) to ensure that enclosure temperature does not drop below the freezing point.

• When there is no call for humidity, an aquastat maintains tank temperature at the factory default of 70 °F (21 °C). This temperature can be reset in the ﬁeld to be from 40 to 180 °F (4 to 82 °C).

• When the ambient temperature in the enclosure reaches 85 °F (29 °C), two ventilation fans turn on to cool the electronic components. A high limit is also provided to power down the STS if the enclosure temperature reaches 150 °F (66 °C). In a high limit situation, the ventilation fans continue to run and once the enclosure temperature falls below 130 °F (54 °C), the STS automatically resumes normal operation.

• A normally open drain valve is provided on the STS Outdoor Enclosure to drain the tank in the event of a power loss.

Humidiﬁer in Outdoor Enclosure

Electrical connections

Remote Vapor-logic keypad

Drain piping

Water piping

Curb

Steam piping

Roof surface

OM-7464

FIGURE 17-2: OUTDOOR ENCLOSURE CLEARANCES

Left side: 36" (914 mm)

Front: 36" (914 mm)

Top: Keep open

Back: 12" (305 mm)

OM-955 mc_012611_1546

Right side: 24" (610 mm)

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

ALTERNATE WATER SEAL AND DRAIN VALVE PIPING

Piping:

Drain

The drain line piped from the humidiﬁer must be run to an approved sanitary waste or suitable drain. If nonmetallic pipe or steam hose is used, it must be rated for 212 °F (100 °C) minimum continuous operating temperature.

Minimum drain pipe sizes:

STS models 25 through 100: 3/4" (DN20) outside diameter.

STS models 200 through 800: 1" (DN25) outside diameter.

If the length of the drain piping exceeds 10' (3 m), increase the pipe size.

If combining multiple drain lines, ensure that proper common pipe sizing practices are used.

Do not locate the humidiﬁer directly above a ﬂoor drain — skim and drain water dumped into the ﬂoor drain will cause ﬂash steam. This steam will rise and saturate electrical components, adversely affecting component life and performance.

TEMPERING DRAIN WATER

Governing codes may require that the 212 °F (100 °C) drain and skim water from the humidiﬁer be tempered before it is discharged into the building drain piping. The Drane-kooler® option will temper 6 gpm (22.7 L/m) of 212 °F (100 °C) water to 140 °F (60 °C).

See the detailed piping drawings on Pages 22 through 25.

WATER SEAL

To allow normal operation and prevent steam from escaping through the drain line, the installer must provide a water seal of a sufﬁcient height to contain the pressure developed in the humidiﬁer system. See Table 27-1 for water seal

heights.

Drain piping after the water seal must be pitched a minimum of 1/8"/ft (1%) toward the drain. Governing codes may require more pitch.

CONDENSATE PUMP

If the proximity of a drain requires the humidiﬁer drain and skim water to be lifted by a pump, DriSteem offers a condensate pump option. A check valve is required on the discharge of the pump. Electrical power for the pump is independent of the humidiﬁer. Plug the pump into a wall outlet; an integral ﬂoat switch turns the pump on and off.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Piping:

Drain

STS with RO/DI water option and manual drain has a pipe thread ﬁtting on the drain valve and on the skim/overﬂow ﬁtting. Prior to dumping into a drain, the installer needs to connect the drain and skim/overﬂow, provide a water seal of height H1 (see Table 22-1), and pipe.

DRAIN CONNECTION

Note: This section applies to all tap/softened water STS models and all STS

models with the RO/DI and auto drain options.

The installer should install a water seal of height H1 (see Table 22-1).

The drain connection provided is a ProBite™ quick connection. Connect as follows:

1. See Warning and Caution at right.

2. Cut drain line to length for insertion depth shown below for your ProBite connector size. Cut must be clean and smooth.

3. Ream and de-burr drain line before connecting to ProBite connection. Make sure drain line is clean, round, and free from damage.

4. Mark insertion depth on drain line according to table below for your ProBite connection size.

5. Push drain line into ProBite connection to insertion depth marked in Step 4.

WARNING

Do not insert ﬁngers or any body part into ProBite connection openings

Insert only piping into ProBite connection. Inserting ﬁngers or any body part could require emergency medical attention for removal.

CAUTION

ProBite installation precautions

To avoid damage to the ProBite connection:

• In addition to DriSteem drain piping material requirements on the facing page, ProBite ﬁttings are compatible only with copper, PEX, CPVC or stainless steel.

• Do not solder within 10" (250 mm) of the ProBite connection.

• Do not use heat or glue when installing the ProBite connection.

FIGURE 19-1: DRAIN CONNECTION (ALL MODELS EXCEPT STS WITH RO/DI WATER OPTION AND MANUAL DRAIN)

ProBite ﬁtting

Connector

size

OM-7644

Drain line

3/4" 1

Insertion depth (D)

in. mm

/1627 mm

1" 1 5/1633 mm

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Piping:

WATER SUPPLY PIPING

All STS humidiﬁer models have a 1" (25 mm) internal air gap to prevent back siphoning into a potable water system. However, some governing codes may require additional protection such as a vacuum breaker or backﬂow preventer.

The supply water pressure range must be 25 to 80 psi (172 to 552 kPa).

TAP/SOFTENED WATER STS

Water supply assembly includes a strainer, needle valve, and ﬁll solenoid — 1/4" pipe thread (DN8) connection. European models are provided with a 3/8" pipe thread (DN10) connection. Since the primary component of the water supply assembly is a solenoid valve, there may be noise issues that surface during a ﬁll cycle.

During a ﬁll cycle, the supply water drops the water temperature in the tank and may collapse the steam, which can cause a low rolling sound. To diminish this, adjust the needle valve to decrease the water ﬁll rate and/or use hot supply water.

In cases where water hammer occurs when the ﬁll solenoid closes, a shock arrester is recommended. Reducing the supply water pressure (minimum 25 psi [172 kPa]) or using ﬂexible tubing (rated 212 °F [100 °C], minimum continuous operating temperature) may diminish the noise, but installing a shock arrester is the best solution.

Fill

The minimum water conductivity for the probe-type water level control system to work is 30 µS/cm.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Piping:

STS WITH RO/DI WATER OPTION

A ﬂoat valve controls the water supply — 1/4" pipe thread (DN8) connection. European models are provided with a 3/8" pipe thread (DN10) connection. For the end-of-season drain option, a solenoid valve is added on the inlet of the ﬂoat valve. This option shuts off the ﬁll water supply and drains the tank when there is no demand for humidity for 72 hours. (This is a default setting, which is adjustable. To modify this value, see the Vapor-logic Installation and Operation Manual.)

When using nonmetallic tubing for supply water, it must be rated for 212 °F (100 °C) minimum continuous operating temperature. DriSteem recommends installing a three-foot (914 mm) piece of noninsulated stainless steel pipe directly off the humidiﬁer prior to connecting to the nonmetallic tubing. When using nonmetallic tubing, DriSteem recommends the installer place a 2" (50 mm) water seal/loop in the supply line to isolate steam during RO/DI water system maintenance.

DriSteem recommends installing a strainer in the water supply line to prevent clogging of the ﬂoat valve oriﬁce. A strainer is highly recommended when the humidiﬁer has the end-of-season drain option. The strainer will prevent particulate from collecting at the solenoid valve seat.

Fill

If an STS humidiﬁer with the RO/DI water option is supplied with tap water, the ﬂoat valve assembly will become clogged and run without water.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Piping:

FIGURE 22-1: FIELD PIPING OVERVIEW FOR TAP/SOFTENED WATER STS MODELS 25, 50, 100, 200, AND 400

3/4" pipe thread (DN20) dispersion unit condensate return inlet*

Water supply line (see Table 23-1); water pressure range 25 to 80 psi (172 to 582 kPa); water conductivity 30 µS/cm minimum

Optional condensate return piping from evaporative dispersion unit*

* Condensate return piping is

not needed for Ultra-sorb Model XV dispersion unit, which returns pressurized condensate to the boiler. See the Ultra-sorb Model XV Installation Guide for condensate piping requirements.

Tap/softened water, one heat exchanger

Water supply shut-off valve (by installer) If water piping to humidiﬁer is nonmetallic, we recommend a 2" (50 mm) metallic water seal or loop in the supply line to isolate steam during maintenance

Unions (by installer)

Vacuum breaker (by installer)

Air vent tube

H2 (see

Table 22-1) 6" (152 mm) minimum

3/4" (DN20) minimum condensate drain piping rated for 212 °F (100 °C)*

Strainer

From steam source

Condensate return to nonpressurized system, by gravity only

Trap

Shock arrester recommended to reduce water hammer (by installer)

12" (305 mm) minimum drop to trap

Drain, skim, overﬂow piping rated for 212 °F (100 °C) (see sizes in Table 23-1)

Pitch 1/8"/ft

(1%) toward drain

H1 (see

Table 22-1)

Steam outlet

Install level

Electric drain valve

Overﬂow line

DC-1451

If run is over 10' (3 m), increase pipe to 1¼" (DN32)

1" (25 mm) air gap

Open ﬂoor drain. See ﬁrst note below.

Water seal line MUST be below drain valve to ensure humidiﬁer drains correctly

Notes:

• Offset humidiﬁer from ﬂoor drain to prevent ﬂash steam from rising into the humidiﬁer.

• Locate air gap only in spaces with adequate temperature and air movement to absorb ﬂash steam; otherwise, condensation may form on nearby surfaces. Refer to governing codes for drain pipe size and maximum discharge water temperature.

• Water supply inlet is more than 1" (25 mm) above skim/overﬂow port, eliminating the possibility of backﬂow or siphoning from tank. No additional backﬂow prevention is required; however, governing codes prevail.

• Damage caused by chloride corrosion is not covered by your DriSteem warranty.

• Dashed lines indicate provided by installer.

Table 22-1: Heights required to overcome humidifier internal pressure (H1, H2)

Water seal height (H1) Air vent height (H2)

Unit output

lbs/hr kg/h inches mm inches mm inches mm

≤ 138 ≤ 62 12 305 27 686 — —

139-183 63–83 15 381 30 762 — —

> 183 > 83 18 457 33 838 42.25 1073

All STS models

25, 50, 100, 200, 400 800

STS models

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Piping:

FIGURE 23-1: FIELD PIPING OVERVIEW FOR TAP/SOFTENED WATER STS MODEL 800

3/4" pipe thread (DN20) dispersion unit condensate return inlet*

Shock arrestor (by installer) recommended to eliminate water hammer

Water supply line (see Table 23-1); water pressure range 25 to 80 psi (172 to 582 kPa); water conductivity 30 µS/cm minimum

6" (152 mm) minimum

* Condensate return piping is

not needed for Ultra-sorb Model XV dispersion unit, which returns pressurized condensate to the boiler. See the Ultra-sorb Model XV Installation Guide for condensate piping requirements.

Tap/softened water, two heat exchangers

Water supply shut-off valve (by installer)

Unions (by installer)

Optional condensate return piping from evaporative dispersion unit*

Air vent tube

Vacuum breaker (by installer)

Strainers

From steam source

H2 (see Table 22-1)

Condensate return to nonpressurized system, by gravity only

3/4" (DN20) minimum condensate drain piping rated for 212 °F (100 °C)*

Traps

12" (305 mm) minimum drop to trap

H1 (see

Table 22-1)

Drain, skim, overﬂow piping rated for 212 °F (100 °C) (see sizes in Table 23-1)

Pitch 1/8"/ft

(1%) toward drain

Steam outlet

Overﬂow

line

Install level

DC-1467

Install level

Electric drain valve

If run is over 10' (3 m), increase pipe to 1¼" (DN32)

Water seal line MUST be below drain valve to ensure humidiﬁer drains correctly

1" (25 mm) air gap Open ﬂoor drain. See ﬁrst note below.

Notes:

• Offset humidiﬁer from ﬂoor drain to prevent ﬂash steam from rising into the humidiﬁer.

• Damage caused by chloride corrosion is not covered by your DriSteem warranty.

• Dashed lines indicate provided by installer.

Table 23-1: STS connection sizes

Description Connection size

Water makeup (ﬁll) 1/4" pipe thread (DN8), all STS models

Drain

Steam outlet Varies with capacity and dispersion type; see Table 27-1

Condensate return 3/4" pipe thread (DN20)

Pressurized steam supply inlet and return outlet

3/4" (DN20) for STS models 25 through 100 1" (DN25) for STS models 200 through 800

See sizes in Tables 5-1 and 5-2.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Piping:

FIGURE 24-1: FIELD PIPING OVERVIEW FOR STS MODELS 25, 50, 100, 200, AND 400 WITH RO/DI WATER OPTION

Water supply line (see Table 25-1); water pressure range 25 to 80 psi (172 to 582 kPa); ﬁrst 3' (1 m) of supply line must be rated for 212 °F (100 °C)

If water piping to humidiﬁer is nonmetallic, we recommend a 2" (50 mm) metallic water seal or loop in the supply line to isolate steam during maintenance

Optional condensate return piping from evaporative dispersion unit*

Air vent tube

* Condensate return piping is

not needed for Ultra-sorb Model XV dispersion unit, which returns pressurized condensate to the boiler. See the Ultra-sorb Model XV Installation Guide for condensate piping requirements.

RO/DI water option, one heat exchanger

Steam outlet

3/4" pipe thread (DN20) dispersion unit condensate return inlet*

Unions (by installer)

Vacuum breaker

6" (152 mm) minimum

(by installer)

Strainer

H2 (see Table

24-1)

3/4" (DN20) minimum condensate drain piping rated for 212 °F (100 °C)*

From steam source

Condensate return to nonpressurized system, by gravity only

Trap

12" (305 mm) minimum drop to trap

H1 (see

Table 24-1)

Drain, skim, overﬂow piping rated for 212 °F (100 °C) (see sizes in Table 25-1)

Install level

Overﬂow line

Pitch 1/8"/ft

(1%) toward drain

Install level

DC-1459

Manual SST drain valve (electric drain valve available for end-of-season drain option)

If run is over 10' (3 m), increase pipe to 1¼" (DN32)

Water seal line MUST be below drain valve to ensure humidiﬁer drains correctly

1" (25 mm) air gap

Open ﬂoor drain. See ﬁrst note below.

Notes:

• Offset humidiﬁer from ﬂoor drain to prevent ﬂash steam from rising into the humidiﬁer.

• Damage caused by chloride corrosion is not covered by your DriSteem warranty.

• Dashed lines indicate provided by installer.

Table 24-1: Heights required to overcome humidifier internal pressure (H1, H2)

Water seal height (H1) Air vent height (H2)

Unit output

lbs/hr kg/h inches mm inches mm inches mm

≤ 138 ≤ 62 12 305 27 686 — —

139-183 63–83 15 381 30 762 — —

> 183 > 83 18 457 33 838 42.25 1073

All STS models

25, 50, 100, 200, 400 800

STS models

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Piping:

FIGURE 25-1: FIELD PIPING OVERVIEW FOR STS MODEL 800 WITH RO/DI WATER OPTION

If water piping to humidiﬁer is nonmetallic, we recommend a 2" (50 mm) metallic water seal or loop in the supply line to isolate steam during maintenance

Optional condensate return piping from dispersion unit*

* Condensate return

piping is not needed for Ultra-sorb® Model XV dispersion unit, which returns pressurized condensate to the boiler. See the Ultra-sorb Model XV Installation Guide for condensate piping requirements.

RO/DI water option, two heat exchangers

Water supply line (see Table 25-1); water pressure range 25 to 80 psi (172 to 582 kPa)

Air vent tube

Strainer (by installer)

Vacuum breakers (by installer)

6" (152 mm) minimum

H2 (see Table

24-1)

3/4" (DN20) minimum condensate drain piping rated for 212 °F (100 °C)*

Unions (by installer)

Strainers (by installer)

From steam source

Traps

Condensate return to nonpressurized system, by gravity only

12" (305 mm) minimum drop to traps

Steam outlet

Pitch 1/8"/ft

(1%) toward drain

H1 (see

Table 24-1)

Drain, skim, overﬂow piping rated for 212 °F (100 °C) (see sizes in Table 25-1)

Install level

Overﬂow

line

Install level

DC-1468

3/4" pipe thread (DN20) dispersion unit condensate return inlet*

Manual SST drain valve (electric drain valve available for end-of-season drain option)

If run is over 10' (3 m), increase pipe to 1¼" (DN32)

Water seal line MUST be below drain valve to ensure humidiﬁer drains correctly

1" (25 mm) air gap

Open ﬂoor drain. See ﬁrst note below

Notes:

• Offset humidiﬁer from ﬂoor drain to prevent ﬂash steam from rising into the humidiﬁer.

• Damage caused by chloride corrosion is not covered by your DriSteem warranty.

• Dashed lines indicate provided by installer.

Table 25-1: STS connection sizes

Description Connection size

Water makeup (ﬁll) 1/4" pipe thread (DN8), all STS models

Drain

Steam outlet Varies with capacity and dispersion type; see Table 27-1

Condensate return 3/4" pipe thread (DN20)

Pressurized steam supply inlet and return outlet

3/4" (DN20) for STS models 25 through 100 1" (DN25) for STS models 200 through 800

See sizes in Tables 5-1 and 5-2

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Piping:

Pressurized steam supply

The heat exchanger in the STS humidiﬁer is designed for a maximum steam pressure of 15 psi (105 kPa). The steam valve, trap, and strainer are shipped loose for ﬁeld installation.

Figure 26-1 shows piping from an overhead steam supply main with condensate returned to a vented gravity ﬂow return system. Note the steam trap installed at the bottom of the branch feeding the steam valve of the STS. Failure to install this trap will cause water hammer, which could damage the STS heat exchanger.

Vacuum breakers are necessary to ensure that condensate can drain from the heat exchanger when the steam valve closes.

Lifting condensate with pressurized steam is not recommended. Premature heat exchanger failure and erratic control can occur when using pressurized steam to lift condensate. A steam condensate pump is recommended when lifting condensate in a pressurized system.

FIGURE 26-1: STEAM SUPPLY PIPING TO STS HUMIDIFIER

Note:

For STS 800 models, to guarantee steam output capacities, a dedicated steam valve and steam trap is required for each heat exchanger.

End of branch trap (by installer)

Steam main

12"

Steam trap, required for proper operation (by DriSteem)

Alternate vacuum breaker position

12"

Vacuum breaker (by installer)

Swing check valves (by installer)

OM-941

Gravity condensate return

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Piping:

Humidification steam outlet

Table 27-1: STS steam outlet sizes and types

STS model

25 X

50 X X

100 X X X

200 X X X X

400 X X X X

800 X X X

Note: For pipe thread steam outlet options, see DriCalc, DriSteem’s free sizing and selection

software, available at www. dristeem.com.

FIGURE 27-3: FLANGE CONNECTION

Support member

Hose size Flange size

2" (DN50) 3" (DN80) 4" (DN100) 5" (DN125) 6" (DN150)

Support tubing from above to prevent excessive weight on humidiﬁer outlet. Allow for thermal expansion.

FIGURE 27-1: HOSE CONNECTION

Steam hose

Hose clamp

Steam outlet connection (tubing)

DC-1455

Note: Tap/softened water model shown.

FIGURE 27-2: TUBING CONNECTION USING HOSE CUFF WITH CLAMPS

Tubing

Hose clamps

6" (152 mm) long hose cuff

Steam outlet connection (tubing)

DC-1458

Steam outlet connection (ﬂange)

Notes:

• Dashed lines indicate provided by installer.

• Tap/softened water model shown.

DC-1456

Notes:

• Dashed lines indicate provided by installer.

• Tap/softened water model shown.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Wiring

WIRING DIAGRAM LOCATIONS

• Ladder style wiring diagrams (located inside control cabinet door) show power, control, and humidiﬁer-to-control-cabinet interconnection requirements.

• External connections diagrams (located inside control cabinet door) show connection points to the microprocessor-based controller and wire terminals for the following external safety and control devices: airﬂow proving switches, high limits, transmitters, or humidistats.

All wiring must be in accordance with all governing codes and with STS wiring diagrams.

ELECTRICAL INSTALLATION

Wiring and branch circuit protection is provided by the installer per the National Electrical Code (NEC) or in Europe, IEC 60364. For power supply and machine ground connections, size the wire using the 75 °C wiring table, per the NEC (or IEC 60364). Then use copper conductors rated for a 105 °C environment. The wiring from the control cabinet to the humidiﬁer must be rated for 105 °C.

All STS humidiﬁers have a 120V, single phase electrical supply for North America or 230V, single phase electrical supply for Europe. Verify current characteristics and capacity requirements against those listed on the name plate.

WIRING REQUIREMENTS

WARNING

Electric shock hazard

Only qualiﬁed electrical personnel should perform ﬁeld wiring installation procedures. Improper wiring or contact with energized circuits can cause property damage, severe personal injury, or death as a result of electric shock and/or ﬁre.

Do not open control cabinet until electrical power is disconnected.

CAUTION

Damage from debris

When drilling penetrations in the control cabinet, protect all internal components from debris, and vacuum out the control cabinet when ﬁnished. Failure to comply with this directive can damage sensitive electronic components, cause erratic operation or failure, and void your DriSteem warranty.

The length of wire from the control cabinet to the humidiﬁer must not exceed 50' (15 m). Run control wiring in dedicated, earthed, metal conduit or cable trays or trunking that is separated from the building’s power wiring.

FIGURE 28-1: WATER LEVEL CONTROL WIRING FOR VAPOR-LOGIC

Brown or black, top probe rod (full water condition)

Orange or white, middle probe rod (reﬁll water condition)

Violet or red, bottom probe rod: Low water condition,

tap/softened water

TOP

MID

LOW

Notes:

• See Outdoor Enclosure electrical speciﬁcations in Table 13-2.

• Damage caused by chloride corrosion is not covered by your DriSteem warranty.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Wiring

INSTALLATION

The control cabinet should be mounted in a location convenient for service with a minimum of 36" (914 mm) clearance in front of the door.

The installer is responsible for making electrical connections at the power terminals.

CONTROL WIRING

The following wiring methods for external low-voltage control wiring should minimize electrical noise problems:

• Humidistat, RH transmitter, and temperature transmitter wiring must be minimum 18-gauge (1 mm2) plenum rated, shielded (screened), twisted pair wire with a bare drain wire for grounding.

• Airﬂow proving switch wiring must be minimum 18-gauge (1 mm

) stranded wire run in conduit. The airﬂow proving switch can be wired using minimum 18-gauge (1 mm2) plenum rated, shielded (screened), twisted pair wire with a bare drain wire for grounding.

• The shield (screen) wire should be connected to the shield (screen) ground terminal/lug with a length less than 2" (51 mm). Do not ground the shield (screen) wire on the humidistat or transmitter end.

• Water level control device, ﬁll valve, and drain valve wiring must be minimum 18-gauge stranded wire run in a separate conduit from power wires. DO NOT USE SHIELDED (SCREENED) CABLE FOR WATER LEVEL CONTROL DEVICES.

Important:

procedures can result in erratic operation or failure.

This product has been tested at the factory for proper operation. Product failures resulting from faulty handling, incorrect wiring, or shorting of wires together on external components are not covered under your DriSteem warranty. Review information and diagrams before proceeding.

Failure to follow these wiring

• The tank temperature sensor can be run with 18-gauge (1 mm2) stranded wire if the control cabinet is located within 10' ( 3 m) of the humidiﬁer. For wire lengths of 10' to 50' (3 m to 15 m), use 18-gauge (1 mm2) plenum rated, shielded (screened), twisted pair wire with a bare drain wire for grounding.

GROUNDING REQUIREMENTS

The approved earth ground must be made with solid metal-to-metal connections and must be a good conductor of radio frequency interference (RFI) to earth (multistranded conductors).

Ground wire should be the same AWG (mm2) size as the power wiring or sized per NEC requirements (in Europe, IEC 60364 requirements).

When the control cabinet is mounted remotely from the humidiﬁer, a ground wire is necessary from the machine ground lug on the humidiﬁer to the machine ground lug in the control cabinet. The bonding machine ground wire should be no less than 14-gauge AWG (mm2) or sized per NEC or IEC 60364 requirements.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Sensor placement

SENSOR LOCATION IS CRITICAL

Sensor location has a signiﬁcant impact on humidiﬁer performance. See the recommendations below and Figure 30-1.

Note: DriSteem recommends that you do not interchange room and duct

humidity devices. Room humidity devices are calibrated with zero or little airﬂow, whereas duct humidity devices require air passing across them.

Recommended humidity control (transmitter/humidistat) locations: A Ideal. Ensures the best uniform mix of dry and moist air with stable

temperature control.

B Acceptable, but room environment can affect controllability, such as when

sensor is too close to air grilles, registers, or heat radiation from room lighting.

C Acceptable. Provides uniform mixture of dry and moist air. If extended time

lag exists between humidity generation and sensing, extend sampling time.

D Acceptable (behind wall or partition) for sampling entire room if sensor is

near an air exhaust return outlet. Typical placement for sampling a critical area.

E Not acceptable. These locations might not represent actual overall

conditions in the space.

Other factors affecting humidity control

Humidity control involves more than the controller’s ability to control the system. Other factors that play an important role in overall system control are:

• Size of humidiﬁcation system relative to load

• Overall system dynamics associated with moisture migration time lags

• Accuracy of humidistats and humidity transmitters and their location

• Dry bulb temperature accuracy in space or duct

• Velocities and airﬂow patterns in ducts and space environments

• Electrical noise or interference

F Not acceptable. Do not place sensors near windows, door passageways,

or areas of stagnant airﬂow.

Recommended safety (airﬂow and high limit) sensor location: G Best sensing location for high limit humidistat or humidity sensor and airﬂow

proving switch.

FIGURE 30-1: RECOMMENDED SENSOR LOCATIONS

Outside air

Relief air

Damper control

Return air

DC-1084M

8' to 12'

(2.4 m to 3.7 m)

min.

Air handling

Doorway

Window

unit

Wall or partition

Window

High limit humidistat or high limit transmitter (set at 90% RH maximum) for VAV applications

Airﬂow switch or differential pressure switch (sail type recommended for VAV applications)

Vapor absorption has taken place

Point of vapor absorption

Humidiﬁer dispersion assembly

Turning vanes

Temperature compensation option: Place a temperature compensation sensor on the lower corner of the inside surface of double-pane window glass on north- or northeast-facing window.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Dispersion:

Selecting the dispersion assembly location

DriSteem humidiﬁers operate with several types of dispersion assemblies for open spaces and for ducts and air handling units.

Dispersion assemblies in ducts and air handling units must be positioned where the water vapor being discharged is carried off with the airstream and is absorbed before it can cause condensation or dripping.

• Non-wetting distance is the dimension downstream from the leaving side of the steam dispersion assembly to the point where wetting will not occur, although wisps of steam may be present. This distance was calculated during humidiﬁcation system design and is dependent on several application parameters. To determine your dispersion assembly’s non-wetting distance, consult your system’s design engineer or project documentation. Non-wetting distance can also be calculated using DriSteem’s DriCalc sizing and selection software, available at www. dristeem.com. Note that your current design conditions may vary from conditions used for system design.

• In general, the dispersion assembly is best placed where the air can absorb the moisture being added without causing condensation at or after the unit. This normally will be after the heating coil or where the air temperature is highest.

WARNING

Hot surface and steam hazard

Dispersion tube, steam hose or tubing can contain steam, and surfaces can be hot. Discharged steam is not visible. Contact with hot surfaces or air into which steam has been discharged can cause severe personal injury.

Important:

Failure to follow the recommendations in this section can result in excessive back pressure on the humidiﬁer. This will result in unacceptable humidiﬁcation system performance such as leaking gaskets, blown water seals, erratic water level control, and spitting condensate from dispersion tubes.

• Place the dispersion assembly such that absorption will occur

– before the intake of a high efﬁciency ﬁlter, because the ﬁlter can remove

the visible moisture and become waterlogged; – before coming in contact with any metal surface; – before ﬁre or smoke detection devices; – before a split in the duct; otherwise, the dispersion assembly can direct

more moisture into one duct than the other.

• When draining dispersion condensate to an open drain, provide a 1" (25 mm) air gap between the condensate drain piping and the drain. Locate the gap only in spaces with adequate temperature and air movement to absorb ﬂash steam; otherwise, condensation may form on nearby surfaces.

OVERHEAD INSTALLATION

Water piping and humidiﬁers should not be installed above expensive equipment. A condensing or leaking water pipe or other accidental water spillage could cause serious damage to the equipment below.

When such an installation cannot be avoided, install a galvanized drip pan under the humidiﬁer piping, valve, etc. to catch and drain away unintended water. See Figure 8-4.

It is advisable to terminate the drain above an open ﬂoor drain. The overﬂow from the STS should be piped separately to a ﬂoor drain. Do not drain the STS directly into the drip pan.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Dispersion: Interconnecting piping requirements

• The steam outlet on the humidiﬁer is sized to the output of the humidiﬁer. DO NOT use steam hose or interconnecting piping with an inside diameter smaller than the humidiﬁer steam outlet.

• See maximum steam carrying capacities in Table 33-1.

• See the steam loss data in Table 33-2.

• See Table 36-2 for interconnecting tubing and pipe pitch requirements for single tube and multiple tube applications. See Table 41-1 for interconnecting tubing and pipe pitch requirements for Rapid-sorb applications.

• If the humidiﬁer must be located higher than the dispersion assembly, use the recommended installation shown in Figure 34-1.

• For single tube applications, see capacities in Table 35-1.

CONNECTING TO HUMIDIFIER WITH STEAM HOSE

• Support steam hose to prevent sags, or low spots, and to maintain a minimum pitch of 2"/ft (15%) back to the humidiﬁer.

• Use DriSteem steam hose. Other manufacturers of steam hose may use unacceptable release agents or material mixes that can affect humidiﬁer system performance adversely. Using hose from alternative manufacturers increases the possibility of tank foaming and accelerated aging. Foaming causes condensate discharge at the dispersion assembly.

Important:

• Do not use steam hose in outdoor applications.

• Do not insulate steam hose. Insulation causes accelerated heat aging, causing the steam hose to become hard and susceptible to failure due to cracks.

CONNECTING TO HUMIDIFIER WITH TUBING

• Support interconnecting piping between the humidiﬁer steam outlet and the dispersion system with pipe hangers. Failure to properly support the entire steam piping weight may cause damage to the humidiﬁer tank and void the warranty.

• 90° elbows are not recommended; use two 45° elbows, 1' (0.3 m) apart.

• Insulat tubing to reduce the loss in output caused by condensation.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Dispersion: Interconnecting piping requirements

Table 33-1: Maximum steam carrying capacity and length of interconnecting steam hose or tubing

Steam hose

Copper or stainless steel tubing

INSTALLATION

Hose I.D. Maximum capacity Maximum length

Tubing size Maximum capacity 3

Maximum developed

length

inches DN lbs/hr kg/h ft m inches DN lbs/hr kg/h ft m

2 50 250 113 10 3 2 50 220 100 30 9

125

150

450 204 80 24

750 340 100 30

1400 635 100 30

2300 1043 100 30

1. When using steam hose, use DriSteem steam hose for best results. Field-supplied hose may have shorter life and may cause foaming in the evaporating chamber resulting in condensate discharge at the dispersion assembly. Do not use steam hose for outdoor applications.

2. Maximum recommended length for steam hose is 10' (3 m). Longer distances can cause kinking or low spots.

3 5 80

4 5 100

3. Insulate tubing to minimize loss of capacity and efﬁciency.

4. Developed length of tubing equals measured length plus 50% of measured length, to account for ﬁttings.

Longer tubing lengths are possible at capacities lower than listed

maximums. Consult factory.

5. Requires ﬂange connection.

Note: Capacities and lengths in this table are based on total maximum pressure drop in hose or tubing of 5" wc (1250 Pa).

Table 33-2: Steam loss of interconnecting steam hose or tubing

Steam loss

Insulation thickness

Description

Nominal hose or tubing size

Noninsulated Insulated

inches DN lbs/hr/ft kg/h/m lbs/hr/ft kg/h/m inches mm

1½ 40 0.15 0.22 N/A N/A N/A N/A

Hose

2 50 0.20 0.30 N/A N/A N/A N/A

1½ 40 0.11 0.16 0.020 0.030 2.0 50

2 50 0.14 0.21 0.025 0.037 2.0 50

3 80 0.20 0.30 0.030 0.045 2.5 64

Tubing

4 100 0.26 0.39 0.030 0.045 3.0 76

5 125 0.31 0.46 0.035 0.052 3.0 76

6 150 0.36 0.54 0.039 0.058 3.0 76

Note: Data based on an ambient air temperature of 80 °F (27 °C), ﬁberglass insulation, and copper tubing.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Dispersion: Drip tee installation

Install a drip tee as shown below when the humidiﬁer is mounted higher than the dispersion assembly, when interconnecting hose or tubing needs to go over an obstruction, or when interconnecting piping runs are long.

Important: Steam hose must be supported to prevent sagging or low spots.

FIGURE 34-1: DRIP TEE INSTALLATION (PIPING OVER AN OBSTRUCTION)

90° long sweep or two 45° elbows

Insulate tubing and to reduce steam loss

To dispersion device

6" (150 mm)

minimum

8" (200 mm)

minimum

Pitch

Obstruction

DC-1470

STS humidiﬁer

Tubing drip tee, by installer. DriSteem part number for 304 stainless steel in-line tee: 2" diameter (DN50): No. 162712

3/4" (DN20)

1" (25 mm) air gap

Funnel or ﬂoor drain

Notes:

• Support steam hose so there are no sags or low spots.

• Dashed lines indicate provided by installer.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Dispersion: Single tube and multiple tube

DISPERSION TUBE MOUNTING

• See the hose kit sizes in Table 35-1 for single tube applications.

• Orient dispersion tube(s) so that tubelets (steam oriﬁces) point up.

• See Table 36-2 for dispersion tube pitch requirements.

• When mounting the humidiﬁer above the level of the dispersion tube(s), see drip tee installation in Figure 34-1.

CONDENSATE DRAIN PIPING

• Minimum diameter (ID) for draining from one or two dispersion tubes: 3/4" (DN20)

• Minimum diameter (ID) for draining from three or more dispersion tubes: 1" (DN25)

• Condensate drain piping must be rated for 212 °F (100 °C) continuous operating temperature.

• Condensate drain line must be piped as shown in the ﬁgures on the following pages. Provide a 6" (152 mm) drop prior to a 5" (127 mm) water seal to:

INSTALLATION

− Ensure drainage of condensate from the header

− Keep steam from blowing out of the drain line

• After the water seal, run the drain line to an open drain with a 1" (25 mm) vertical air gap. Cut the drain line at a 45° angle on the end above the drain to permit a direct stream of water into the drain pipe while maintaining a 1" (25 mm) air gap. Locate air gap only in spaces with adequate temperature and air movement to absorb ﬂash steam, or condensing on nearby surfaces may occur.

• All drain lines must be installed and sized according to governing codes.

Table 35-1: Single dispersion tube capacities

Insulated

Tube size

inches DN lbs/hr kg/h lbs/hr kg/h lbs/hr kg/h lbs/hr kg/h

1½ 40 29 13.2 65 29.5 28 12.7 62 28.2

2 50 65 29.5 97 44.1 62 28.2 93 42.3

(High-Efﬁciency Tubes)

Without drain With drain Without drain With drain

Uninsulated

Notes:

• Single dispersion tube available with face width between 6" (152 mm) up to 120" (3048 mm) in 1" (25 mm) increments.

• If face width is <19" (483 mm), tube capacity may be reduced. Consult DriSteem or see DriCalc for the correct capacity.

• Hose kits are available that include dispersion tube, 10 ft (3 m) of steam hose, and hardware

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Dispersion: Single tube and multiple tube

FIGURE 36-1: SINGLE TUBE DISPERSION WITHOUT CONDENSATE DRAIN

Duct

Single dispersion tube without condensate drain

Steam hose or tubing. Insulate tubing to reduce steam loss. Do not insulate steam hose.

STS humidiﬁer

Pitch*

Secure and seal duct escutcheon plate

90° long sweep or two 45° elbows

OM-7512

Table 36-1:

3/8" (M10) mounting nut

Tube pitch 2"/ft (15%)

Dispersion tube escutcheon plate

Dashed lines indicate provided by installer * Pitch steam hose or tubing toward humidiﬁer: – 2"/ft (15%) when using steam hose – 1/8"/ft (1%) when using tubing

(diameter)

Dispersion tube

escutcheon plate

dimensions

for 2" tube

inches mm

A 2.03 52

B 5.00 127

Table 36-2: Pitch of dispersion tube(s) and interconnecting piping for Single tube or multiple tube evaporative dispersion units*

Condensate drain

Without drain

Type of

interconnecting piping

Steam hose 2" (DN50)

Tubing 2" (DN50)

Diameter of

dispersion tube and

interconnecting piping

Pitch of

interconnecting piping

2"/ft (15%)

toward humidiﬁer

1/8"/ft (1%)

toward humidiﬁer

Pitch of

dispersion tube(s)

2"/ft (15%)

toward humidiﬁer

Pitch of

condensate drain

No drain

Steam hose 2" (DN50)

With drain

Tubing 2" (DN50)

* When piping over an obstruction, see the drip tee installation illustration on Page 38.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

toward humidiﬁer

2"/ft (15%)

1/4"/ft (2%)

1/8"/ft (1%)

toward

condensate

drain

1/4"/ft (2%)

toward ﬂoor drain or

toward humidiﬁer if

humidiﬁer is below

dispersion unit

Dispersion: Single tube and multiple tube

FIGURE 37-1: SINGLE TUBE DISPERSION WITH CONDENSATE WASTED TO FLOOR DRAIN

INSTALLATION

Steam hose or tubing. Insulate tubing to reduce steam loss. Do not insulate steam hose.

90° long sweep or two 45° elbows

STS humidiﬁer

Notes:

1. Locate air gap only in spaces with adequate temperature and air movement to absorb ﬂash steam, or condensing on nearby surfaces my occur. Refer to governing codes for drain pipe size and maximum discharge water temperature.

2. Pitch steam hose or tubing toward humidiﬁer:

– 2"/ft (15%) when using steam hose – 1/2"/ft (5%) when using 1½" tubing – 1/4"/ft (2%) when using 2" tubing

3. Dashed lines indicate provided by installer

Secure and seal escutcheon plates

Pitch

(see Note 2 below)

6" (152 mm) recommended

Water seal 5" (127 mm)

1" (25 mm) air gap

Duct

1/4" (DN8) pipe thread

Condensate drain tube, by installer, minimum 3/4" (DN20); must be suitable for 212 °F (100 °C) water

Open drain required. See Note 1 below.

Dispersion tube

3/8" (M10) mounting nut

Pitch tube toward drain 1/8"/ft (1%)

1/2" (DN15) O.D. condensate drain tube; pitch 1/4"/ft (2%)

DC-1473a

Table 37-1: Dispersion tube and condensate

drain escutcheon plate dimensions

inches mm

A 2.03 52

B 5.00 127

C 0.75 19

D 3.25 83

FIGURE 37-1: DISPERSION TUBE AND CONDENSATE DRAIN ESCUTCHEON PLATES

Dispersion tube plate

(diameter)

Condensate drain plate

(diameter)

OM-351c

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Dispersion: Single tube and multiple tube

FIGURE 38-1: SINGLE TUBE WITH CONDENSATE RETURNED TO HUMIDIFIER

Steam hose or tubing

90% long sweep or two 45° elbows

Secure and seal escutcheon plates

Pitch*

Duct

Dispersion tube

Mounting nut, 3/8" (M10)

6" (152 mm)

minimum

6" (152 mm)

minimum

STS humidiﬁer

H2 (see Table

24-1)

3/4" (DN20) condensate return connection (on face plate)

Dashed lines indicate provided by installer * Pitch steam hose or tubing toward humidiﬁer: – 2"/ft (15%) when using steam hose – 1/2"/ft (5%) when using 1½" tubing – 1/4"/ft (2%) when using 2" tubing

FIGURE 38-2: SINGLE TUBE DISPERSION WITH CONDENSATE DRAIN

Thermal-resin tubelets (steam oriﬁce inserts)

1/2" (13 mm)

Condensate drain tube, by installer, 3/4" DN20 minimum. Return line piping material must be suitable for 212 °F (100 °C) water. Note: Condensate may be returned to the humidiﬁer or wasted to a drain. See the previous page for piping condensate to a drain.

air vent

1/4" pipe thread (DN8)

5" (127 mm) water seal

Pitch tube toward drain 1/8"/ft (1%)

1/2" (DN15) O.D. condensate drain tube, pitch 1/4"/ft (2%)

DC-1473b

OM-351b

1/4" (DN8) pipe thread end

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Movable escutcheon plate. Plate can be mounted within limits of

2.5" (64 mm).

Mounting bracket

1/2" O.D. (DN15) condensate drain

Dispersion: Single tube and multiple tube

FIGURE 39-1: MULTIPLE TUBE WITH CONDENSATE WASTED TO FLOOR DRAIN

INSTALLATION

Steam hose or tubing

90° long sweep or two 45° elbows

STS humidiﬁer

DC-1048a

Secure and seal escutcheon plates

Pitch*

Water seal

5" (127 mm)

1" (25 mm) air gap

Dispersion tube

(152 mm)

Duct

¼" pipe thread (DN8)

Condensate drain tube provided by installer, 3/4" (DN20) minimum

1/2" (13 mm) air vent

Open drain required. Locate air gap only in spaces with adequate temperature and air movement to absorb ﬂash steam; otherwise, condensation may form on nearby surfaces. Refer to governing codes for drain pipe size and maximum discharge water temperature.

Dispersion tube

Mounting nut, 3/8" (M10)

Pitch tube toward drain

1/8"/ft (1%) 1/2" (DN15) O.D. condensate drain tube, pitch 1/4"/ft (2%)

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Dispersion: Rapid-sorb

Read all dispersion instructions in this manual, and follow the installation instructions below:

• Unpack shipment and verify receipt of all Rapid-sorb components with packing list. Report any shortages to DriSteem immediately. The components typically include the following:

– Multiple dispersion tubes – Header – 3/4" × 2" (19 mm × 51 mm) L-bracket Note: Dispersion tubes, header, and L-bracket are each tagged with the

customer requested identiﬁcation number. – A single duct escutcheon plate the size of the header – Slip couplings or hose cuffs and clamps – Accessories such as duct plates, slip couplings, or hose cuffs – Bolts and washers for mounting the dispersion tubes to the bracket

• L-bracket mounting holes (see note at left):

– L-bracket 50" (1270 mm) long or shorter has a mounting hole 4" (102

mm) from each end for mounting the L-bracket to the duct or air handler wall.

– L-bracket longer than 50" (1270 mm) has an additional mounting hole

in the center.

Note: Hardware for mounting the L-bracket to the duct or air handler wall

and the hardware for the header support bracket is not provided.

• Select an installation location that provides necessary access in and around the ductwork or air handler.

CAUTION

Operate Rapid-sorb within rated steam capacity

Excessive steam ﬂow to the Rapid-sorb steam dispersion assembly can cause condensate to exit the tubelets, which can cause water damage and standing water in the duct or air handler.

To avoid condensate exiting the tubelets, do not operate the Rapid-sorb beyond its rated capacity.

Important: Before marking and

drilling holes in the duct or air handler, refer to ALL pitch requirements for the Rapid-sorb assembly you received (see Table 41-1). The size, quantity, and location of penetrations are determined by the dimensions and conﬁguration of the Rapid-sorb assembly you received.

• The Rapid-sorb typically is installed centered side to side in a duct, or is installed across the face of a coil in an air handler.

• The center line of the outer dispersion tubes should never be closer than

4.5" (114 mm) from the side of the ductwork or air handler wall.

• The following instructions are for a typical Rapid-sorb installation — horizontal-airﬂow duct with Rapid-sorb header either inside or outside the duct. See the DriCalc Installation Guides library or contact your representative/distributor or DriSteem for installation instructions for air handler or vertical airﬂow applications.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Dispersion: Rapid-sorb

INSTALLATION

PITCH REQUIREMENTS

• For Rapid-sorb with the header outside a horizontal-airﬂow duct, consider the following:

– 1½" (DN40) dispersion tubes: Use a fastener of sufﬁcient length to

accommodate the 1/8"/ft (1%) pitch requirements toward the 3/4" pipe thread (DN20) header drain ﬁtting.

– 2" (DN50) dispersion tubes: The bracket can be mounted ﬂush to the

ductwork. The 1/8"/ft (1%) pitch typically can be accomplished in the length of the hose cuffs used to connect the tubes to the header.

• See Table 41-3 and the drawings on the following pages for pitch requirements.

Table 41-1: Rapid-sorb tube capacities*

Tube diameter

inches DN lbs/hr kg/h lbs/hr kg/h

1½ 40 43 19.5 40 18.2

2 50 80 36.4 77 35

* Capacities shown are for horizontal airﬂow.

See DriCalc for vertical airﬂow capacities. If face height is <22” (559 mm), tube quantity per panel may need to increase to compensate for reduced capacity of short tubes. Consult DriSteem or see DriCalc for the correct calculation.

Insulated

(High-Efﬁciency

Tubes)

Uninsulated

Table 41-2: Rapid-sorb header capacities

Header capacity Header diameter

lbs/hr kg/h inches DN

≤ 250 ≤ 113 2 50

251-500 114-227 3 80

501-800 228-363 4 100

801-1300 364-591 5 125

1301-2100 592-955 6 150

Table 41-3: Pitch of interconnecting piping, dispersion tubes, and headers for Rapid-sorb evaporative dispersion units

Airﬂow

Horizontal

Vertical

Type of

interconnecting piping

Steam hose 1½" (DN40), 2" (DN50)

Tubing

Steam hose 1½" (DN40), 2" (DN50)

Tubing

Diameter of

interconnecting piping

1½" (DN40), 2" (DN50),

3" (DN80), 4" (DN100),

5" (DN125), 6" (DN150)

1½" (DN40), 2" (DN50),

3" (DN80), 4" (DN100),

5" (DN125), 6" (DN150)

Pitch of

interconnecting piping

2"/ft (15%)

toward

Rapid-sorb

1/8"/ft (1%)

toward

Rapid-sorb

2"/ft (15%)

toward

Rapid-sorb

1/8"/ft (1%)

toward

Rapid-sorb

Pitch of

dispersion tubes

Vertically

plumb

2"/ft toward header

Pitch of header

1/8"/ft (1%)

toward

condensate

drain

1/8"/ft (1%)

toward

condensate

drain

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Dispersion: Rapid-sorb

FIGURE 42-1: RAPID-SORB INSTALLED IN A HORIZONTAL AIRFLOW WITH HEADER OUTSIDE THE DUCT

Position L-bracket so that ﬂange is upstream of dispersion tubes. This drawing shows the L-bracket positioned for airﬂow back to front

Dispersion tube

Point tubelets (steam oriﬁces) perpendicular to airﬂow

Airﬂow

Duct

90° long sweep or two 45° elbows

Steam hose or tubing

* Pitch steam hose or tubing toward Rapid-sorb: – 2"/ft (15%) when using steam hose – 1/8"/ft (1%) when using tubing

HEADER OUTSIDE OF DUCT, HORIZONTAL AIRFLOW

Slip coupling or hose cuff

Pitch*

Pitch header toward drain 1/8"/ft (1%)

STS humidiﬁer

DC-1471

3/4" pipe thread (DN20) condensate drain

3/4" (DN20) copper

1" (25 mm) air gap

1. Mark and cut holes in the ductwork for the dispersion tubes. Use the L-bracket as a template to mark the holes on the duct floor.

2. Temporarily, loosely suspend or support the header below the final location. Vertical balance point of the dispersion tube length dictates where the header should be suspended or temporarily supported.

Support bracket

6" (152 mm)

5" (127 mm)

3. Mount the dispersion tubes to the header with the slip coupling or hose cuff (provided).

• When installing slip couplings for 1½" (DN40) dispersion tubes, take

care not to shear the O-rings.

• Set the slip coupling on the header stub or dispersion tube so the O-ring

is resting on the face of the tubing.

• Rotate the slip coupling as you push it onto the tubing.

• The O-rings are lubricated at the factory. If additional lubrication is

necessary, DO NOT use a petroleum-based lubricant.

4. Position the flange of the L-bracket so it is upstream of the tubes when the assembly is raised and fastened into position. Fasten the L-bracket to the end of the dispersion tubes with the provided bolt, lock washer, and flat washer.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Dispersion: Rapid-sorb

INSTALLATION

5. Before tightening the L-bracket bolts to the dispersion tubes:

• For 1½" (DN40) dispersion tubes: – Dispersion tube will rotate in slip coupling. Verify that dispersion tube

oriﬁces are directed perpendicular to airﬂow.

– Dispersion tube and slip coupling must be fully engaged on header

stub for O-rings to provide a seal.

• For 2" (DN50) dispersion tubes:

Before securing hose cuff in place with hose clamps on dispersion tube

and the header stub, verify that dispersion tube oriﬁces are directed perpendicular to airﬂow.

6. Slide the assembly up until the L-bracket aligns with the mounting holes in the duct.

• For 1½" (DN40) dispersion tubes:

– Header pitch is duplicated in the L-bracket. – Dispersion tube and slip coupling must be fully engaged on header

stub for O-rings to provide a seal. – High end of L-bracket can be fastened tight to duct or air handler. – Fastener on low end of L-bracket must be long enough to compensate

for pitch. Use a nut on both sides of L-bracket and duct or air handler

for stability.

• For 2" (DN50) dispersion tubes: – Fasten bracket to top of duct and use hose cuffs to compensate for

header pitch.

– Before securing hose cuffs with hose clamps on dispersion tube and

header stub, verify that header pitch, 1/8"/ft (1%) toward drain, is maintained.

Note:

See Page 46 for steam supply and condensate drain line connection instructions.

7. Permanently secure both ends of header, and verify that header pitch, 1/8"/ft (1%) toward drain, is maintained.

8. Verify that all fasteners are secure:

• L-bracket to duct

• Dispersion tubes to L-bracket

• Hose clamps on 2" (DN50) tubes

9. Secure and seal the dispersion tube escutcheon plate and condensate drain tube escutcheon plate around the respective tubes, if applicable.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Dispersion: Rapid-sorb

FIGURE 44-1: RAPID-SORB INSTALLED IN A HORIZONTAL AIRFLOW WITH HEADER INSIDE THE DUCT

Position L-bracket so that ﬂange is upstream of dispersion tubes. This drawing shows the L-bracket positioned for airﬂow back to front

Dispersion tube

Point tubelets (steam oriﬁces) perpendicular to airﬂow

Airﬂow

90° long sweep or two 45° elbows

Steam hose or tubing

* Pitch steam hose or tubing toward Rapid-sorb: – 2"/ft (15%) when using steam hose – 1/8"/ft (1%) when using tubing

HEADER INSIDE OF DUCT, HORIZONTAL AIRFLOW

Slip coupling or hose cuff

Pitch*

Pitch header toward drain 1/8"/ft (1%)

STS humidiﬁer

DC-1472

3/4" pipe thread (DN20) condensate drain

3/4" (DN20) copper

1" (25 mm) air gap

1. Mark and cut holes in ductwork or air handler for steam header penetration, condensate drain piping, and header support bracket fastener. Allow 1/8"/ft (1%) header pitch toward the support bracket when you drill the hole for the header support bracket fastener.

Duct

5" (127 mm)

Support bracket

6" (152 mm)

2. Loosely fasten the header in place.

3. Rotate the header 90° so the header stubs point horizontally in the duct. When installing in an air handler, the rotation of the header is often less than 90°. Typically, due to the condensate drain piping requirements, the header can be set on the floor of the air handler, assembled in the vertical position, and then raised and mounted in place.

4. Mount the dispersion tubes on the header with the slip couplings or hose cuffs:

• When installing slip couplings for 1½" (DN40) dispersion tubes, take

care not to shear O-rings.

• Set slip coupling on header stub or dispersion tube so O-ring is resting

on face of tubing.

• Rotate slip coupling while pushing it onto the tubing.

• O-rings are lubricated at factory. If additional lubrication is necessary,

DO NOT use petroleum-based lubricant.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Dispersion: Rapid-sorb

INSTALLATION

5. Allow the dispersion tubes to rest against the bottom of the duct.

6. Position the flange of the L-bracket so it is upstream of the tubes when the assembly is rotated into position. Fasten the L-bracket to the end of the dispersion tubes with the provided bolt, lock washer, and flat washer.

7. Rotate the assembly up until the L-bracket aligns with the mounting holes in the duct or air handler.

• For 1½" (DN40) dispersion tubes:

– Header pitch is duplicated in the L-bracket. – Dispersion tube and slip coupling must be fully engaged on header

stub for O-rings to provide a seal. – High end of L-bracket can be fastened tight to duct or air handler. – Fastener on low end of L-bracket must be long enough to compensate

for pitch. Use a nut on both sides of L-bracket and duct or air handler

for stability.

• 2" (DN50) dispersion tubes – Fasten bracket to top of duct and use hose cuffs to compensate for

header pitch.

– Before securing hose cuffs with hose clamps on dispersion tube

and header stub, verify that dispersion tube oriﬁces are directed perpendicular to airﬂow.

Note:

See Page 46 for steam supply and condensate drain line connection instructions.

8. Verify that all fasteners are secure:

• L-bracket to duct

• Dispersion tubes to L-bracket

• Hose clamps on 2" (DN50) tubes

• Header support bracket fastener

9. Secure and seal the header escutcheon plate around the header.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Dispersion: Rapid-sorb

STEAM SUPPLY CONNECTIONS TO RAPID-SORB HEADER

Connect the steam supply interconnecting piping from the humidiﬁer to the Rapid-sorb. The steam supply piping requires a minimum of 1/8"/ft (1%) pitch toward the header.

If multiple humidiﬁers are supplying one Rapid-sorb, a multiple steam supply connector is needed. Typically, the multiple steam supply connector attaches to the Rapid-sorb header supply end with hose cuff and clamps:

1. Route the necessary number of steam supplies from the humidifier tanks to the steam supply connector.

2. Position the steam supply connector to accept the steam supplies while maintaining the necessary pitch.

3. Make sure the hose clamps on the steam supply connector and header are tight.

CONDENSATE DRAIN CONNECTIONS TO RAPID-SORB HEADER

Piping must be minimum 3/4" I.D. (DN20) and rated for 212 °F (100 °C) minimum continuous operating temperature.

The condensate drain line must be piped as shown in Figures 42-1 and 44-1. Provide a 6" (152 mm) drop prior to a 5" (127 mm) water seal to:

• Ensure drainage of condensate from the header

• Keep steam from blowing out of the drain line

After the water seal, run the drain line to an open drain with a 1" (25 mm) vertical air gap.

• Cut the drain line at a 45° angle on the end above the drain to permit a direct stream of water into the drain pipe while maintaining a 1" (25 mm) air gap.

FIGURE 46-1: ULTRA-SORB WITH THE HIGH-EFFICIENCY TUBE OPTION

High-efficiency Tube option

Dispersion assemblies with the High-efﬁciency Tube option are designed to produce signiﬁcantly less dispersion-generated condensate and airstream heat gain, which reduces wasted energy by up to 85%. These improvements are accomplished by reducing the thermal conductivity of the tubes with 1/8" of polyvinylidene ﬂuoride (PVDF) insulating material on the outside of the tubes. These assemblies require careful unpacking, installation, and handling. If your dispersion assembly has the High-efﬁciency Tube option, be sure to read this section carefully.

• Locate air gap only in spaces with adequate temperature and air movement to absorb ﬂash steam, or condensing on nearby surfaces may occur.

All drain lines must be installed and sized according to governing codes.

ULTRA-SORB

For Ultra-sorb steam dispersion panel instructions, see the installation, operation, and maintenance manual shipped with the Ultra-sorb.

Start-up procedure

After the system is installed and connected properly:

1. Verify that the STS humidifier, controls, piping, electrical connections, steam supply, and dispersion unit(s) are installed according to the following:

• Installation instructions in this manual

• Vapor-logic Installation and Operation Manual

– Installation section – Pre-installation checklist

• Ladder style wiring diagram (inside control cabinet)

• External connections wiring diagram (inside control cabinet)

• All governing codes

2. Verify that electrical connections in the control cabinet and at the humidifier are secure before applying power.

3. Verify that the humidifier is mounted level and securely supported before filling with water. See operating weights in Table 6-1.

OPERATION

WARNING

Electric shock hazard

Only qualiﬁed electrical personnel should perform start-up procedure.

Contact with energized circuits can cause property damage, severe personal injury or death as a result of electrical shock or ﬁre.

Make sure control cabinet door is in place and secure before turning on electrical power.

The Vapor-logic version 5 Installation and Operation Manual is a comprehensive operation manual. Refer to it for information regarding the following features:

4. Verify that the humidifier is level from front to back and side to side after it is full of water.

5. Read the “Operation” section of the Vapor-logic Installation and Operation Manual.

Note: During start-up, do not leave the humidiﬁer unattended.

6. Perform all applicable “Start-up checklist” items. See Page 48.

7. Monitor humidifier operation through multiple fill cycles. The humidifier operating status appears on the keypad/display.

8. On tap/softened water units, water skims from the humidifier after every fill cycle. Adjust the amount of skim by increasing or decreasing the skim time (see the Vapor-logic Installation and Operation Manual). At start-up, DriSteem recommends initially running the humidifier with the factory default setting for skim time. See “Maintenance,” beginning on Page 49.

• Keypad/display setup and menu information

• Control input signals and functions

• Drain, ﬂush, and skim features

• Safety features

• Alarm screens and fault messages

The manual was shipped with your humidiﬁer and is available at our Web site: www.dristeem.com

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

OPERATION

Start-up checklist

If an item in the Start-up checklist below does not apply to your system, skip to the next item and continue the process.

☐ Read this manual and all other information that was provided with your

humidiﬁer.

☐ Verify that all ﬁeld wiring is done according to the instructions in this

manual and in the humidiﬁer wiring diagram.

☐ Conﬁrm that the input signal is consistent with the Vapor-logic controller's

expected input signal. Input signals are listed in the Vapor-logic Setup menu. See “Installation Step 2: Setup” in the Vapor-logic Installation and Operation Manual.

☐ Conﬁrm that proper grounding and an approved earth ground are

provided.

☐ Conﬁrm that the keypad/display is mounted with its modular cable routed

away from high-voltage circuits and connected to the Display connector on the Vapor-logic board.

☐ Turn on the water supply, and conﬁrm that the drain valve is closed.

☐ Turn on power to the humidiﬁer, and conﬁrm the Main menu is displayed

on the keypad/display. The display may take several seconds to appear as the controller powers up.

☐ Conﬁrm in the Main Menu that the mode is “Auto” and that tank status is

“Filling.”

☐ When “Filling” appears in main menu, conﬁrm that the tank is ﬁlling with

water.

☐ In the Status screen, conﬁrm that the Duct Airﬂow Switch is closed.

☐ In the Status screen, conﬁrm that the high limit humidistat input is closed or

the high limit transmitter is connected.

☐ With sufﬁcient water in the tank, the airﬂow switch closed, the high limit

closed, the safety interlock closed, and the humidiﬁer getting a call for humidity, verify that the steam valve is activated.

☐ If you experience difﬁculties, have the keypad/display information

available along with the serial number and humidiﬁer Model, and call DriSteem Technical Support at 800-328-4447.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Water quality

The best way to determine how often your humidiﬁer needs maintenance is to remove the tank cover and inspect it for mineral deposits after three months of duty. Hours of operation and duty cycle will determine your maintenance schedule, as will water quality.

WATER QUALITY AND MAINTENANCE

Maintenance requirements vary with water quality, because tap and softened water carry a variety of minerals and other materials in a mix that varies from location to location. Very hard (high mineral content) water requires more frequent cleaning and drain/ﬂush cycles than water with low mineral content.

Softened water signiﬁcantly reduces mineral accumulation inside the humidiﬁer.

Note: Solids, like silica, are not removed in the softening process.

SKIM DURATION

Skim duration determines the quantity of water skimmed with each ﬁll cycle and is ﬁeld adjustable using the Vapor-logic keypad/display.

MAINTENANCE

WARNING

Hot surface and hot water hazard

Do not touch the tank or drain piping until the unit has had sufﬁcient time to cool, or serious injury can occur.

Opening the drain valve when the tank is hot can discharge water with a temperature up to 212 °F (100 °C) into the plumbing system. This can cause damage to the plumbing system if the humidiﬁer is not properly connected to a water tempering device such as a DriSteem Drane-kooler

™

Skimming reduces the need for frequent humidiﬁer cleaning. Each time the tank reﬁlls, it ﬁlls to a level just above the lip of the skim/overﬂow ﬁtting. A portion of the ﬁll water ﬂows out of the skim/overﬂow ﬁtting to the drain, which ﬂushes minerals left by the previous evaporating cycle and skims away surface residue.

Both humidiﬁer cleaning and heated water ﬂowing to the drain are operational costs. DriSteem recommends that the user observe and adjust the skim duration to achieve a balance between reducing mineral buildup and conserving heated water.

Humidifier De-scaling Solution

Scale buildup on humidiﬁer heat exchangers acts as an insulator, reducing humidiﬁer performance while increasing energy costs. To keep humidiﬁers operating as efﬁciently as possible, remove scale with DriSteem's Humidiﬁer De-scaling Solution, available for purchase from your DriSteem representative or distributor.

The De-scaling Solution cleans without risk of corroding humidiﬁer tanks or welds. The De-scaling Solution also cleans surfaces unreachable by hand scraping.

DriSteem's Humidiﬁer De-scaling Solution is the only approved cleaner/de-scaler for use with DriSteem humidiﬁers. Use of other cleaners/ de-scalers may void your DriSteem warranty.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

MAINTENANCE

Tap/softened water

COOL DOWN HUMIDIFIER

Before performing any maintenance, allow the tank to cool down.

Note: Fresh make-up water is used to speed up cooling. Do not close the

manual water supply before cooling down the humidiﬁer; otherwise the tank could stay hot for several hours.

• Insulated and uninsulated tanks will have hot surfaces.

• Close the manual shut-off valve on the inlet steam supply.

• Models with a standard drain valve and Vapor-logic controller:

– For drain valves without the manual open lever, use the keypad to

perform the cool down process. Refer to the Vapor-logic Installation and

Operation Manual. – Select Manual Drain in the control modes screen. – Allow approximately half the water to drain out of the tank. – Select Auto in the control modes screen; the ﬁll valve opens and the

humidiﬁer cools down. – When the ﬁll valve closes, select Manual Drain in the control modes

screen and allow the tank to drain dry. The humidiﬁer should be cool

enough to work on.

CAUTION

Hot discharge water

Discharge water can be as hot as 212 °F (100 °C) and can damage the drain plumbing.

To prevent such damage from humidiﬁers without water tempering, allow the tank to cool before draining.

Humidiﬁers equipped with a water tempering device such as a DriSteem Drane-kooler need fresh make-up water in order to function properly. Make sure the water supply to the water tempering device remains open during draining.

Excessive supply water pressure

Supply water pressure greater than 80 psi (550 kPa) can cause the humidiﬁer to overﬂow.

Troubleshooting

The Vapor-logic Installation and Operation Manual, which was shipped with your

humidiﬁer, is a comprehensive operation manual. Refer to it for troubleshooting information.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Tap/softened water

INSPECTION AND MAINTENANCE

1. Annually (also recommended when maintenance is performed)

• All safety devices in the control circuit should be cycled on and off to verify they are functioning. These include:

– High limit switch – Airﬂow proving switch – Low water level probe. Pull out probe plug; ﬁll valve should energize.

• Inspect tank and gaskets for leaks.

2. Seasonally (or as required, depending on water quality)

• Cleaning the tank – Remove cleanout plate and dispose any loose scale that has

collected in the bottom of the tank. This should be done before the scale buildup reaches the bottom of the heat exchanger.

– Inspect the area inside the tank in front of the drain valve ﬁtting, and

thoroughly clean all scale and mineral buildup from that area.

• Cleaning the probes – Disconnect the probe plug and cable assembly (located on top of the

tank), and unscrew the probe rod assembly from the humidiﬁer probe housing using the probe tool (see Figure 51-1).

– Inspect the probe housing and clean, ensuring that all housing

passageways are clear. To detach the housing from the tank, remove the four bolts that attach it to the tank. Then lift the housing up out of

the tank. – The scale should ﬂake off easily from the probe assembly rods. – The bottom 3/8" (10 mm) is the sensing portion of each probe rod;

it should be brushed clean with a wire brush, abrasive pad, or steel

wool. – Inspect the composite plastic probe rod assembly for any signs

of cracking, roughness, or deterioration. If found, replace probe

assembly. – Reassemble the probe rod assembly, and torque as indicated in

Figure 51-1.

MAINTENANCE

WARNING

Shutdown procedure

To prevent serious injury, follow this shutdown procedure before performing service or maintenance procedures on this humidiﬁer (after the tank has cooled down and drained):

1. Use Vapor-logic keypad/display to change control mode to Standby.

2. Place all power disconnects in OFF position and lock in OFF position.

3. Close the ﬁeld-installed manual water supply shut-off valve.

4. Close the manual shut-off valve on the inlet steam supply.

FIGURE 51-1: PROBE TOOL

Probe tool

OM-7395X

Remove and install probe assembly with supplied probe tool. Attach a 3/8" square drive to the probe tool.

When installing, torque probe assembly to 120 in-lbs (10 ft-lbs; 13.6 N-m). Probe tools can be ordered from your DriSteem representative (Part no. 185101).

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

MAINTENANCE

Tap/softened water

• Cleaning the skim overﬂow port – Water should drain from the skimmer drain pipe after each ﬁll cycle.

This should be veriﬁed visually by a weekly inspection.

– Loosen deposits in and around the skimmer overﬂow port with a long

tool such as a screwdriver.

– Water should drain from the skimmer drain pipe after each ﬁll cycle.

This should be veriﬁed visually by a weekly inspection.

– Loosen deposits in and around the skimmer/overﬂow port with a

long tool such as a screwdriver.

– If ﬂow through the water seal/P-trap is diminished due to mineral

accumulation:

- Remove the water seal piping from the humidiﬁer and ﬂush out.

- Replace the water seal with new piping if the minerals have

hardened in the water seal.

- Install a union at the base of the water seal to ease removal if

water quality causes the water seal to become clogged often with scale.

When the seasonal maintenance requirements are complete:

• Re-install the cleanout plate, and torque the nuts to 25 to 35 in-lbs (2.8 to

4.0 N-m).

• Verify that the probe rod holder is secure and that the probe plug and cable assembly are plugged into the probe rod holder.

• Replace and secure all covers.

• Verify that the drain valve assembly is in the closed position.

• Turn on the water supply.

• Turn on the electrical power.

• Do not leave humidiﬁer unattended. Allow the humidiﬁer to cycle through multiple ﬁll cycles and verify that the humidiﬁer cover, cleanout plate, and probe holder gasket are not leaking.

3. Off-season maintenance

• Perform complete inspection and cleaning of the following:

– Heat exchanger – Probe rods – Skimmer port and water seal – Humidiﬁer tank

• After the humidiﬁcation season, DriSteem recommends a complete

inspection and cleaning of the heat exchanger, skimmer, and water chamber. After cleaning, the unit should remain empty until humidiﬁcation is required.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

RO/DI water option

Regularly verify that water processing equipment is operating correctly. The presence of chlorides in improperly processed RO/DI water eventually causes pitting and failure of the heat exchanger, tank, and components. Your DriSteem warranty does not cover damage caused by chloride corrosion.

STS humidiﬁers with the RO/DI water option do not require cleaning, but regular inspections are advised. There are no skimming, drain, or ﬂush cycles.

COOL DOWN HUMIDIFIER

Before performing any maintenance, allow the tank to cool down.

Note: Fresh make-up water is used to speed up cooling. Do not close the

manual water supply before cooling down the humidiﬁer; otherwise the tank could stay hot for several hours.

• Insulated and uninsulated tanks will have hot surfaces.

• Close the manual shut-off valve on the inlet steam supply.

MAINTENANCE

WARNING

Shutdown procedure

To prevent serious injury, follow this shutdown procedure before performing service or maintenance procedures on this humidiﬁer (after the tank has cooled down and drained):

1. Use Vapor-logic keypad/display to change control mode to Standby.

2. Place all power disconnects in OFF position and lock in OFF position.

3. Close the ﬁeld-installed manual water supply shut-off valve.

4. Close the manual shut-off valve on the inlet steam supply.

• Models with a standard drain valve:

– Manually open the drain valve. The ﬂoat valve opens. – Let the ﬁll water run until the tank is cooled; then shut off the ﬁeld-

installed manual supply water shut-off valve.

– Let the tank drain; then manually close the drain valve.

• Models with end-of-season drain option:

– Use the keypad to perform the cool down process. Refer to the

Vapor-logic Installation and Operation Manual. – Select Manual Drain in the control modes screen. – Allow approximately half the water to drain out of the tank. – Select Auto in the control modes screen; the ﬁll valve opens and the

humidiﬁer cools down. – When the ﬁll valve closes, select Manual Drain in the control modes

screen and allow the tank to drain completely dry. The humidiﬁer should

be cool enough to work on.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

MAINTENANCE

RO/DI water option

INSPECTION AND MAINTENANCE

1. Annually (also recommended when maintenance is performed)

• All safety devices in the control circuit should be cycled on and off to verify they are functioning. These include:

– High limit switch – Airﬂow proving switch

• Inspect tank and gaskets for leaks.

• Verify that the ﬂoat valve is closing off. If the ﬂoat valve will not shut off, there may be particulate on the valve seat, or the stopper may be worn and need replacing.

As long as mineral-free water is used in the humidiﬁer, no cleaning or

ﬂushing should be necessary.

2. Off-season maintenance

• Perform a complete inspection of the following: – Heat exchanger – Float valve – Humidiﬁer tank and gaskets

• After inspection, the humidiﬁer should remain empty until humidiﬁcation is required.

• After the humidiﬁcation season, DriSteem recommends a complete inspection and cleaning of the heat exchanger, skimmer, and water chamber. After cleaning, the unit should remain empty until humidiﬁcation is required.

On units with Teﬂon coated heat exchangers, do not use a sharp object

when cleaning. Cuts or scratches on the heat exchanger will impair

its ability to shed scale during operation and could cause the Teﬂon to separate from the metal surface.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Outdoor enclosure

Access to the humidiﬁer side cleanout plate is through the Outdoor Enclosure electrical service door.

MAINTENANCE

WARNING

• Clean vent screens annually.

• Check for proper operation of strip heaters and ventilation fans annually.

• Refer to instructions for complete humidiﬁer maintenance, beginning on Page 49.

Table 55-1: Outdoor Enclosure troubleshooting guide

Symptom Possible cause Recommended action

No power Check for power to Outdoor Enclosure.

Fans not operating

Heaters not operating

Doors not sealing

Loose connections Reconnect wiring or tighten.

Broken fan Replace fan.

No power Check for power to Outdoor Enclosure.

Loose connections Reconnect wiring or tighten.

Broken heater Replace heater.

Loose handles Adjust handle.

Bad gasket Replace gasket.

Electric shock and hot surfaces hazards

When performing maintenance on the humidiﬁer:

1. Always switch the keypad control mode to Standby.

2. Place all power disconnects in OFF position and lock in OFF position.

3. Close the ﬁeld-installed manual supply water shut-off valve.

4. Close the manual shut-off valve on the inlet steam supply.

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

REPLACEMENT PARTS

Humidiﬁer tank

FIGURE 56-1: TANK REPLACEMENT PARTS

OM-946

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Humidiﬁer tank

Table 57-1: Tank replacement parts

No. Description Part no.

1 Tank, STS Consult factory

Cover, STS-25 165341-001

Cover, STS-50 165341-002

Cover, STS-100 165341-003

Cover, STS-200/400/800 165341-004

Cover gasket, STS-25 160692-001

Cover gasket, STS-50 160692-002

Cover gasket, STS-100 160692-003

Cover gasket, STS-200/400/800 160692-004

4 Heat exchanger, STS Consult factory

Cleanout plate, STS-25 165481-001

Cleanout plate, STS-50/100 165481-002

Cleanout plate, STS-200/400/800 165481-003

Cleanout plate gasket, STS-25 308015

Cleanout plate gasket, STS-50/100 308015

Cleanout plate gasket, STS-800 308015

7 Fill assembly Consult factory

Float ﬁll assembly, STS-25/50/100 505315

Float ﬁll assembly, STS-200/400 505305

Float ﬁll assembly, STS-800 505340

9 Drain assembly Consult factory

10 Temperature sensor assembly 405760

Probe assembly, STS-25/50/100/200/400 406303-108

Probe assembly, STS-800 406303-109

12 Probe gasket 309350-004

13* Probe plate 120370-020

14 Probe weld 165301

15 Probe plate/weld gasket 308416-001

16 Heat exchanger gasket, STS 308220

17 Heat exchanger mounting plate 164581-001

18 Junction box 407134-005/006

19 Condensate return plug 250192-075

20 Probe plug 406050-004

Components may be in different location or orientation than shown in drawing on previous page. * STS with RO/DI water option only

REPLACEMENT PARTS

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

REPLACEMENT PARTS

Control cabinet

FIGURE 58-1: CONTROL CABINET REPLACEMENT PARTS

Note: Components may be in different location or orientation than shown in drawing.

14 3 1 2

5 6 5

Table 58-1: Control cabinet replacement parts*

No. Description Part no.

1 Control cabinet, 12 x 12 407100-003

2 Subpanel, STS 165720-002

3 Control board, Vapor-logic 183504-014

4 Transformer, 120V to 24V 408965-001

5 Terminal block 408252-001

6 Ground terminal 408252-010

7 Terminal jumper 408252-009

8 Relay, 24V 3PDT, Finder 407900-017

9 DIN-rail end cap 408252-006

10 Terminal spacer 408252-005

11 DIN-rail, 6.5" (165 mm) 167765-006

12 Ground lug 409250-003

13 P-E switch 408100

14 Interlock switch 408470

15 Interlock switch bracket 165614

16 Vapor-logic keypad/display with back 408495-010

17 Vapor-logic keypad cable, 5' (1.5 m) 408490-009

* Specify humidiﬁer model and serial numbers when ordering.

OM-7646

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Outdoor enclosure

FIGURE 59-1: OUTDOOR ENCLOSURE REPLACEMENT PARTS

REPLACEMENT PARTS

OM-953

Table 59-1: Outdoor Enclosure replacement parts

Number in drawing Description Part number

1 500W strip heater 405800-052

2 1100W strip heater 405800-053

3 Cooling fan 405800-068

4 Gasket, door or roof 308005-010*

5 Stat, high limit 405800-065

6 Stat, heater 405800-066

7 Stat, fan 405800-067

* Specify quantity in feet

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

WARRANTY

Expect quality from the industry leader

For more than 45 years, DriSteem has been leading the industry with creative and reliable humidiﬁcation solutions. Our focus on quality is evident in the construction of the STS, which features cleanable, stainless steel construction. DriSteem also leads the industry with a Two-year Limited Warranty and optional extended warranty.

For more information

www.dristeem.com sales@dristeem.com

For the most recent product information visit our Web site: www.dristeem.com

DRI-STEEM Corporation a subsidiary of Research Products Corporation DriSteem is an ISO 9001:2008 certiﬁed company

U.S. Headquarters: 14949 Technology Drive Eden Prairie, MN 55344 800-328-4447 or 952-949-2415 952-229-3200 (fax)

European ofﬁce: Marc Briers Grote Hellekensstraat 54 b B-3520 Zonhoven Belgium +3211823595 (voice) +3211817948 (fax) E-mail: marc.briers@dristeem.com

Continuous product improvement is a policy of DriSteem Corporation; therefore, product features and speciﬁcations are subject to change without notice.

DriSteem, STS, DriCalc, Rapid-sorb, and Vapor-logic are registered trademarks of Research Products Corporation and are ﬁled for trademark registration in Canada and the European community.

Two-year Limited Warranty

DRI-STEEM Corporation (“DriSteem”) warrants to the original user that its products will be free from defects in materials and workmanship for a period of two (2) years after installation or twentyseven (27) months from the date DriSteem ships such product, whichever date is the earlier.

If any DriSteem product is found to be defective in material or workmanship during the applicable warranty period, DriSteem’s entire liability, and the purchaser’s sole and exclusive remedy, shall be the repair or replacement of the defective product, or the refund of the purchase price, at DriSteem’s election. DriSteem shall not be liable for any costs or expenses, whether direct or indirect, associated with the installation, removal or reinstallation of any defective product. Excluded from the Limited Warranty are all consumable and wear and tear items such as cylinders, membranes, ﬁlters, or media replacements. These items are subject to usual wear and tear during usage.

DriSteem’s Limited Warranty shall not be effective or actionable unless there is compliance with all installation and operating instructions furnished by DriSteem, or if the products have been modiﬁed or altered without the written consent of DriSteem, or if such products have been subject to accident, misuse, mishandling, tampering, negligence or improper maintenance. Any warranty claim must be submitted to DriSteem in writing within the stated warranty period. Defective parts may be required to be returned to DriSteem.

DriSteem’s Limited Warranty is made in lieu of, and DriSteem disclaims all other warranties, whether express or implied, including but not limited to any IMPLIED WARRANTY OF MERCHANTABILITY, ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE, any implied warranty arising out of a course of dealing or of performance, custom or usage of trade.

DriSteem SHALL NOT, UNDER ANY CIRCUMSTANCES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOSS OF PROFITS, REVENUE OR BUSINESS) OR DAMAGE OR INJURY TO PERSONS OR PROPERTY IN ANY WAY RELATED TO THE MANUFACTURE OR THE USE OF ITS PRODUCTS. The exclusion applies regardless of whether such damages are sought based on breach of warranty, breach of contract, negligence, strict liability in tort, or any other legal theory, even if DriSteem has notice of the possibility of such damages.

By purchasing DriSteem’s products, the purchaser agrees to the terms and conditions of this Limited Warranty.

Extended warranty

The original user may extend the term of the DriSteem Limited Warranty for a limited number of months past the initial applicable warranty period and term provided in the ﬁrst paragraph of this Limited Warranty. All the terms and conditions of the Limited Warranty during the initial applicable warranty period and term shall apply during any extended term. An extended warranty term of an additional twelve (12) months or twenty four (24) months of coverage may be purchased. The extended warranty term may be purchased until eighteen (18) months after the product is shipped, after which time no extended warranties are available. When a Dristeem humidiﬁer is purchased with a DriSteem RO system, an extended twenty-four (24) month coverage is included.

Any extension of the Limited Warranty under this program must be in writing, signed by DriSteem, and paid for in full by the purchaser.

Drane-kooler is a trademark of DriSteem Corporation.

Product and corporate names used in this document may be trademarks or registered trademarks. They are used for explanation only without intent to infringe.

Form No. STS-IOM-EN-0221 Part No. 890000-501 Rev K

DriSteem STS Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

WARNINGS AND CAUTIONS

OVERVIEW

Product overview

TAP/SOFTENED WATER

RO/DI WATER OPTION

WATER TYPE CONVERSION

Dimensions

Selecting a location

INSTALLATION

Mounting methods

SUPPORT LEGS

WALL BRACKETS

H-LEGS

TRAPEZE HANGER

Weather cover

Outdoor Enclosure

ELECTRICAL SPECIFICATIONS

MOUNTING

STS OUTDOOR ENCLOSURE SEQUENCE OF OPERATION

ALTERNATE WATER SEAL AND DRAIN VALVE PIPING

Piping:

Drain

Fill

Tap/softened water, one heat exchanger

Tap/softened water, two heat exchangers

RO/DI water option, one heat exchanger

RO/DI water option, two heat exchangers

Pressurized steam supply

Humidification steam outlet

Wiring

WIRING DIAGRAM LOCATIONS

ELECTRICAL INSTALLATION

WIRING REQUIREMENTS

CONTROL WIRING

GROUNDING REQUIREMENTS

Sensor placement

Dispersion:

Selecting the dispersion assembly location

ULTRA-SORB

Start-up procedure

OPERATION

Start-up checklist

Water quality

MAINTENANCE

Tap/softened water

RO/DI water option

Outdoor enclosure

REPLACEMENT PARTS

Control cabinet

Outdoor enclosure

WARRANTY