DriSteem STS SERIES, STS 25S, STS 800SNC, STS 400SNC, STS 50S Installation, Operation And Maintenance 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.

mc_051508_1145

WARNING

Attention installer

Read this manual before installing, and leave this manual with product owner. This product must be installed by qualiﬁ ed 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 ﬁ re.

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

CAUTION

Indicates a hazardous situation that could result in damage to or destruction of property if instructions are not followed.

Hot surfaces and hot water

This steam humidiﬁ cation 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 humidiﬁ cation system. Failure to disconnect electrical power could result in ﬁ re, 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 ﬁ re. 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 humidiﬁ er, after the tank has cooled down and drained.

1. Follow the “Cool down humidiﬁ er” instructions on Page 50 (tap/softened water STS) or Page 53 (STS with RO/DI water option) to put the humidiﬁ er 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 ﬁ eld-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.

Humidiﬁ ers 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 humidiﬁ er 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 humidiﬁ er to overﬂ ow.

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STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

iii

Table of contents

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

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 humidiﬁ er

operation and troubleshooting)

• DriSteem Humidiﬁ cation System Design Guide (includes steam loss tables and general humidiﬁ cation information)

DriCalc®:

DriCalc, our software for humidiﬁ cation 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 airﬂ ows

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) humidiﬁ ers use pressurized boiler steam to heat clean ﬁ ll water into chemical-free steam for humidiﬁ cation. See Figure 3-1.

STS humidiﬁ ers 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 humidiﬁ er; therefore, water conductivity must be at least 30 μS/ cm for proper operation. A tap/softened water STS humidiﬁ er will not operate with RO/DI water. For RO/DI water, use STS with the RO/DI water option.

RO/DI WATER OPTION

STS humidiﬁ ers with the RO/DI water option control water level with a ﬂ oat valve (Figure 3-3). Float valves are compatible with RO/DI water only.

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

WATER TYPE CONVERSION

STS tap/softened water humidiﬁ ers can be converted in the ﬁ eld for use with RO/DI water, and STS RO/DI water humidiﬁ ers can be converted in the ﬁ eld 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 humidiﬁ er 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 humidiﬁ er service life and minimize humidiﬁ er 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 humidiﬁ er. 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

OVERVIEW

Product overview

FIGURE 3-1: STS HUMIDIFIERS FIGURE 3-2: WATER LEVEL CONTROL

Notes:

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

• See the piping drawings on Pages 22 through 25.

FOR TAP/SOFTENED WATER HUMIDIFIER

Tap/softened water STS humidiﬁ er

Humidiﬁ cation steam outlet

Probe water level control

Automatic steam valve

Boiler steam

Steam trap

Condensate return

Water seal

Air gap

Open drain

STS humidiﬁ er with the RO/DI water option

Humidiﬁ cation steam outlet

Float valve water level control

OM-938

Heat exchanger

Manual drain or optional motorized drain valve

VLC-OM-030

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).

Humidiﬁ ers 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.

mc_030910_1335-STS

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

Fill valve

Automatic steam valve

Boiler steam

Steam trap

Condensate return

Water seal

Heat exchanger

Manual drain valve

Air gap

Open drain

OM-939

VLC-OM-026

Humidiﬁ ers using RO/DI water control water level using a ﬂ oat valve. An optional low-water cutoff switch is available as a remote water indicator.

mc_030910_1336-STS

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Float rod

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

mc_010511_1012-tap

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 mc_010511_1013-tap

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 ﬁ rst heat exchanger 6.63 168 6.63 168 6.63 168 6.63 168 6.63 168

E Bottom to return outlet of ﬁ rst 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" pipe

thread

3/4" pipe

thread

DN20

1¼" pipe

thread

3/4" pipe

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 ﬁ rst heat

exchanger

Bottom to return outlet of ﬁ rst 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" pipe

thread

3/4" pipe

thread

DN20

1" pipe

thread

3/4" pipe

thread

DN25

DN20

1" pipe

thread

3/4" pipe

thread

STS model*

DN25

DN20

1½" pipe

thread

3/4" pipe

thread

DN40

DN20

1½" pipe

thread

3/4" pipe

thread

DN40

DN20

1½" pipe

thread

3/4" pipe

thread

DN40

DN20

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

OVERVIEW

Capacities, electrical speciﬁ cations, 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

mc_010411_1645

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

STS models

25S 10 5 251130143516

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

mc_010411_1645

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 Teﬂ on 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 humidiﬁ er, consider the following:

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

• Noises inherent to operation such as STS water ﬁ ll cycles

• Easy access for maintenance

• Critical service and maintenance clearances around humidiﬁ er — 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)*

Right side:

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

Rear: 6" (152 mm)

DC-1452 mc_010511_1742-tap

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Mounting methods

FIGURE 8-1: SUPPORT LEGS, STS MODELS 25, 50, AND 100 ONLY FIGURE 8-2: TRAPEZE HANGER, STS

MODELS 25, 50, AND 100 ONLY

See Note 1 Provide 18" (457 mm)

See Note 2

minimum clearance

See Note 3 above cover

See Note 4

mc_010511_1740-tap

OM-933

Tap/softened water model shown

Optional set of four legs and hardware

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

mc_010511_1741-tap

DC-1454

Tap/softened water model shown

STS model

in. mm in. mm

25 and 50 15.5 394 24 610

DriSteem optional wall

100 21 533 30 762

brackets (two required)

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.

1¼" (DN32) minimum

See Note 5

25%

larger than

humidiﬁ er

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

humidiﬁ er.

4. Humidiﬁ er drain to appropriate building

waste. Do not drain humidiﬁ er 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 mc_010511_1743-tap

mc_010511_1744-tap

STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

OM-947

Mounting the humidiﬁ er

INSTALLATION

The STS humidiﬁ er 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 ﬁ lled 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 humidiﬁ er. Position the wall brackets so they are ﬂ ush with the front and back ﬂ anges 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

ﬂ ush with front and back ﬂ anges 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 humidiﬁ er’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 ﬂ oor, 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 ﬂ oor, 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 humidiﬁ er, ﬁ eld-installed piping, and (if mounted on the humidiﬁ er) 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 mc_012511_1606

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

mc_012511_1600

OM-7465 mc_012511_1607

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

mc_012511_1605

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 humidiﬁ er 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 certiﬁ ed 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 humidiﬁ er. Refer to the installation section of this manual for all elec tri cal, supply water, and drain con nec tion requirements.

INSTALLATION ISSUES SPECIFIC TO WEATHER COVER APPLICATIONS

• Installation must comply with all governing codes.

• The bottom of the weather cover is open to ac com mo date piping and electrical con nec tions.

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 humidiﬁ er

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 dis tri bu tion conﬁ gurations. The standard con ﬁ g u ra tion has a steam outlet on the right side of the Outdoor Enclosure for con nect ing to steam dispersion unit piping. The optional internal steam dis tri bu tion con ﬁ g u ra tion 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 en clo sure 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 humidiﬁ er.

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 humidiﬁ er to reduce pressure drop.

6. See the dimensions in Table 13-1.

mc_012511_1635

Optional steam outlet

6.5"

DC-1476

Pipe chase

Table 12-1: Outdoor Enclosure connection sizes

Description

Water makeup

(ﬁ ll)

Drain 3/4” (DN20) 1” (DN25)

Condensate

return

Steam outlet See Table 27-1.

mc_012611_1017

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 humidiﬁ er

mc_012611_1016

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 ﬂ oor

Enclosure drain

Standard steam outlet (exits enclosure here)

STS hu mid i ﬁ er

DC-1478

mc_012611_0837

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.

mc_012611_1015

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

Elec tri cal and cleanout access door

Intake ven ti la tion 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 ﬁ ll 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 ﬁ ll line and freeze if there is a loss of power, DriSteem recommends ﬁ eld installing additional valves upstream of the ﬁ ll 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 ﬁ ll line to prevent freezing.

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

• Install heat tracing and insulation on ﬁ ll 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 ﬁ ll line to cut power to the STS and safety valves to stop ﬁ ll water to the STS and drain the ﬁ ll 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 ﬁ eld 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 ﬁ ll and drain piping, these drains may be tied together. Locate 1" air gap only in spaces with adequate temperature and air movement to absorb ﬂ ash steam; otherwise, condensation may form on nearby surfaces. Refer to governing codes for drain pipe size and maximum discharge water temperature.

mc_011311_1705

Humidiﬁ er

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 humidiﬁ er

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 ﬂ oor

Enclosure drain

Standard steam outlet (exits enclosure here)

STS hu mid i ﬁ er

MOUNTING

DC-1478

Intake ventilation fan

Control panel

Control panel heater

Intake ven ti la tion 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 ﬂ ammable vapors and liquids in open containers in vicinity of Outdoor Enclosure is hazardous.

Valve section heater

Elec tri cal and cleanout access door

Important note about STS Outdoor Enclosure installation

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

• 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 humidiﬁ er 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 sufﬁ cient 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 conﬁ gurations:

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

connecting to steam dispersion unit piping.

– Optional internal conﬁ guration 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 ﬁ ll 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

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DriSteem STS SERIES, STS 25S, STS 800SNC, STS 400SNC, STS 50S Installation, Operation And Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual