DriSteem STS, STS-DI Installation Instructions And Maintenance Operations Manual

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Page 1

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DRI-STEEM

MODEL STS and STS-DI

STEAM-TO-STEAM HUMIDIFIERS

Installation Instructions

and

Maintenance Operations

Manual

For Toll-Free Technical Support,

Call 1-800-328-4447

CUL LISTEDUL LISTED

Page 2

TABLE OF CONTENTS

TO THE PURCHASER AND THE INSTALLER

Thank you for purchasing DRI-STEEM STS® humidification equipment. We have designed and built this equipment to give you total satisfaction and many years of trouble-free service. Proper installation and operating practices will assure you of achieving that objective. We urge you to become familiar with the contents of this manual.

DRI-STEEM Humidifier Company

STS and STS-DI Humidifiers ....................................................................3

Capacities and Dimensions ......................................................................4

Mounting Methods ....................................................................................6

Piping ........................................................................................................8

Piping Diagrams: Steam, Water and Drain ..............................................11

Electrical.................................................................................................... 12

Steam Dispersion Installation ..................................................................13

RAPID-SORB

Assembly and Installation

• Horizontal Duct Installation ...............................................................15

• Vertical Duct Installation ...................................................................16

Start-Up and Operation

• Water Control with VAPOR-LOGIC2...................................................17

Recommended Maintenance ....................................................................18

STS-DI Start-up and Recommended Maintenance ..................................19

Trouble Shooting Guide ...........................................................................20

Replacement Parts ....................................................................................21

Two-Year Limited Warranty ......................................................................24

Page 3

Water Supply Shut Off Valve (not provided)

To Water Supply

Water Strainer

Automatic Steam Valve

To Steam Supply

Steam Trap

Condensate Return

Needle Valve

Water Seal

STS® AND STS®-DI HUMIDIFIERS

¼" NPT Fill Make-Up Valve

Air Gap

Heat Exchanger

Skimmer Tube

Clean-Out Plate

Manual drain or Optional Motorized Drain Valve

Open Drain

STS Humidifier (For use with softened or

unsoftened water.)

This humidifier is designed for use with either softened or unsoftened water (preferably softened). The probe-type level control system requires water conductivity of 100 micromhos/cm (2 grains/gal) minimum to function, and therefore will not operate on water treated by reverse osmosis or deionization. However, STS humidifiers are available for use with these water types. The standard humidifier can be converted in the field to a STS-DI model. See below.

¼" NPT Water Supply Minimum 25 psi Water Pressure

Automatic Steam Valve

Steam Trap

Condensate Return

OM-471

STS-DI Humidifier (For use with demineralized or reverse osmosis water.)

For use with deionized or reverse osmosis water. This unit produces chemical-free steam and reliable, accurate humidification control. It is virtually maintenance-free, with no wasted water, heat, or downtime.

Float Valve

Heat Exchanger

Manual Drain Valve

Water Seal

Air Gap

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

Open Drain

OM-487

Page 4

CAP ACITIES AND DIMENSIONS

Table 4-1: Mechanical dimensions for STS and STS-DI units with stainless steel heat exchanger(s)

noitpircseD

AthgiehllarevO 52.8156452.8156452.8156452.8156452.8156475.82527 BhtdiwecaF 57.4157357.4157352.9109452.8202752.8202752.82027 ChtgnelecaF 86.3200686.93010186.93010112.55004112.55004112.550041 DtelniylppusotmottobmorfecnatsiD 58.657158.657158.657158.657158.657158.6761 EteltuonruterotmottobmorfecnatsiD 53.35853.35853.35853.35853.35853.358

HregnahcxetaehotedismorfecnatsiD 52.33852.33852.33852.33852.33852.338

JtelniylppuS

KteltuonruteR

regnahcxetaehdnocesfo

telniylppusotmottobmorfecnatsiD

teltuonruterotmottobmorfecnatsiD

Table 4-2: Mechanical dimensions for STS and STS-DI units with copper heat exchanger(s)

noitpircseD

AthgiehllarevO 52.8156452.8156452.8156452.8156475.82527 BhtdiwecaF 57.4157357.4157352.9109452.8202752.82027 ChtgnelecaF 86.3200686.93010186.93010112.55004112.550041 DtelniylppusotmottobmorfecnatsiD 36.607136.607136.607136.686136.6861 EteltuonruterotmottobmorfecnatsiD 95.30995.30995.30995.30995.309

HregnahcxetaehotedismorfecnatsiD 52.33852.33852.33852.33852.338

JtelniylppuS

KteltuonruteR

regnahcxetaehdnocesfo

telniylppusotmottobmorfecnatsiD

teltuonruterotmottobmorfecnatsiD

S52-STSS05-STSS001-STSS002-STSCNS004-STSCNS008-STS

.nimm.nimm.nimm.nimm.nimm.nimm

--------------------05.41063

--------------------00.11582

TPN"

)02ND(

TPN"

)02ND(

.nimm.nimm.nimm.nimm.nimm

----------------82.41263

----------------42.11582

TPN"

)02ND(

TPN"

)02ND(

TPN"1

C52-STSC05-STSC001-STSC004-STSC008-STS

)52ND(

TPN"

)02ND(

TPN"

)02ND(

TPN"…1

)23ND(

TPN"1

)52ND(

TPN"

)02ND(

TPN"…1

)23ND(

TPN"…1

)23ND(

TPN"‰1

)04ND(

TPN"

)02ND(

rebmunledoM

TPN"…1

)23ND(

TPN"‰1

)04ND(

TPN"‰1

)04ND(

TPN"

)02ND(

TPN"…1

)23ND(

TPN"‰1

)04ND(

Table notes:

C= Copper

TPN"‰1

)04ND(

TPN"

)02ND(

Table notes:

S= Stainless steel SNC= Stainless steel without Teflon coating

For use with DI/RO

water only

Table 4-3: Capacities for units with stainless steel heat exchangers

ledoM

rebmun

S52-STS

S05-STS

S001-STS

S002-STS

ISPaPkISPaPkISPaPkISPaPk

5430196310951301

hpp

h/gk

hpp

hpp 051

hpp 071

CNS004-STS**

hpp

212

CNS008-STS**

hpp

h/gk

hpp

011

h/gk

hpp

092

h/gk

hpp

293

h/gk

hpp

528

h/gk

hpp

h/gk

hpp

h/gk

hpp

041

h/gk

hpp

231

063

h/gk

hpp

871

255

h/gk

hpp

473

5901

h/gk

hpp

Table 4-4: Capacities for units with copper heat exchangers

sregnahcxetaehleetssselniatshtiwseiticapactuptuO

)aPk(ISPerusserpmaetS*

h/gk

361

h/gk

052

h/gk

794

h/gk

hpp

h/gk

hpp

h/gk

051

hpp

h/gk

093

771

hpp

h/gk

736

982

hpp

h/gk

3221

555

hpp

Table 4-3 and 4-4 notes:

h/gk

* Steam pressure at connection to the STS steam valve (provided by DRI-STEEM)

ledoM

rebmun

ISPaPkISPaPkISPaPkISPaPk

5430196310951301

C52-STS

hpp

h/gk

hpp

C05-STS

hpp 001

C001-STS

hpp 003

C004-STS

hpp 056

C008-STS

hpp

051

h/gk

hpp

003

h/gk

hpp

631

085

h/gk

hpp

592

5721

h/gk

hpp

001

h/gk

hpp

002

h/gk

hpp

631

004

h/gk

hpp

362

027

h/gk

hpp

875

0051

h/gk

hpp

erusserpmaetS*

h/gk

h/gk 181

h/gk

723

h/gk

086

h/gk

** SNC = Stainless No (Teflon) Coating. For use with DI/RO water only.

sregnahcxetaehreppochtiwseiticapactuptuO

021

hpp

h/gk

042

901

hpp

h/gk

084

812

hpp

h/gk

097

853

hpp

h/gk

0061

627

hpp

h/gk

Page 5

CAP ACITIES AND DIMENSIONS

STS and STS-DI® all sizes STS and STS-DI (single heat exchanger) sizes 25S&C, 50S&C,

100S&C, 200S, 400C, and 400SNC

Side view

Table 5-1: Humidifier weights

Front view

¼" NPT water makeup valve

5/16" dia. mounting bolt holes

ledoM

rebmun

52-STS 571975934 05-STS 63325152175

001-STS 05395193136

002-STS* 058683542111 004-STS* 059134023541 008-STS* 0541856014681

Table 5-1 note:

*Suspending from overhead construction is not recommended due to operating weight of unit.

gnitarepO

thgiew

sblgksblgk

gnippihS

thgiew

¾" drain

STS and STS-DI (dual heat exchanger) size 800C and 800 SNC

Front view

¼"NPT water make up valve

/16" dia

mounting bolt holes

Note:

See Tables 4-1 and 4-2 (page 4) for dimensional data.

¾" drain

OM-336

Page 6

MOUNTING METHODS

Mounting Notes

1. For the electrode probe water level control and the skimmer system to properly operate, the humidifier must be mounted level in both directions.

2. Access (12" to 18" minimum) for periodic removal of the top cover is recommended. In most cases, scale that forms on the heat exchanger continuously flakes off as it

Figure 6-1: STS Mounting Options

1. Floor Stand

Clean-out

DRI-STEEM

*24"

*24" is standard, other lengths are optional.

support legs (optional)

OM-504

forms and the loose scale settles to the bottom. A cleanout tray on the floor of the evaporator may be removed periodically through the front clean-out opening.

3. Due to the size and weight of the STS

200, 400 and 800 units, the trapeze hanger and wall brackets are not recommended.

2. Trapeze Hanger (see note 3 above)

Secure rods to overhead construction suitable for the load

Inverted U-tube

3/8"-16 Support Rod

Provide 12" to 18" clearance under duct for cover removal

OM-505

Clean-out

For best absorption U-tube should be at mid height of duct

Threaded rod of size required

Angle or channel of size required

3. Wall Brackets (see note 3 above)

Optional wall brackets, two required

snoisnemiD

tinUAB

05,52STS"¾51"62

001STS"¾02"23

,002STS

008,004

----

OM-517

4. Cradle

Models STS 200, STS 400C and 800C require cradle.

5. Mounting STS Unit on Underside of Duct

Mounting humidifier 12" to 18" below duct recommended to facilitate cover removal.

Two-Piece Escutcheon Plate fastens to bottom of duct (duct omitted for clarity)

Vapor Hose

Cut hole in duct large enough to allow passage of hose clamp

Clamp

OM-755

Steam Dispersion Tube

Vapor Hose

Bottom of Duct

Cover of STS Humidifier

OM-65

12" to 18"

Two-Piece Escutcheon Plate

Cover of STS Humidifier

OM-66

Page 7

MOUNTING METHODS

6. Mounting STS Unit Away from Duct(s) Using Vapor Hose

Vapor hose. (Pitch back min. 2" per foot to humidifier with supports to prevent pockets.) Maximum length 10'. Humidifier must be mounted level.

Stainless steel dispersion tube in middle of duct. Maximum tube length = 10'.

OM-50

7. Mounting STS in Air Handling Unit (with U-Tubes)

Gasketed Access Door

Air Handling Unit Casing

Airflow

Supply Air Duct

Set unit level. Locate unit so that steam dispersion assembly is in the most active part of the air stream.

Airflow

Humidifier Centered in Air Handling Unit

Outdoor and Return Airflow into Air Handling Unit

Airflow

Filter and Mixing Box

Air Handling Unit Coil Section

OM-276

Page 8

PIPING

Steam Supply

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

Make-up Water Piping

Either cold or hot water can be used for make-up. The water pressure must be between 25 to 100 psi. If the water pressure is above 60 psi and/or water hammer would be objectionable, a pressure reducing valve or shock arrester should be installed. Even though the STS has an inner 1" air gap, some local codes may require a vacuum breaker in the water supply pipe.

Make-up Water Considerations

When non-metallic water piping is used, it must be rated to withstand 212°F or greater temperature. If not, the final 3 feet connected to the humidifier should be metallic and should not be insulated.

As part of the fill valve assembly, a needle valve is provided. It restricts the rush of cold water entering the evaporating chamber during each fill cycle. The needle valve adjusted to minimize output disruption and potential "water hammer" (water pressure must be between 25 and 100 psi).

The STS Humidifier works with all water types - potable, softened or demineralized make-up water.

Preferably this humidifier should be supplied with softened water. The probe type level control system requires water conductivity of 100 micromhos/cm (2 gr/gal) minimum to function and will not operate with water treated by reverse osmosis or deionizing process. Specially designed STS DI humidifiers are available for use with these water types.

Softened Water

There are two major advantages derived from using softened water instead of potable water (assuming the untreated supply water hardness is over 10 grains per gallon): maintenance and accuracy of control.

Maintenance

The skimmer, in conjunction with softened water, is an unbeatable combination for eliminating scale formation in the evaporating chamber. Several seasons of operation with no need for cleaning is normal, even with water having up to 30 grains of dissolved minerals per gallon prior to being softened.

Accuracy of Control

Reducing the higher skimmer quantity and eliminating the drain/flush cycle (both of which are accomplished by the use of softened water) improves controllability.

Softened Water Reduces Water Usage

The fewer number of make-ups per unit of time and the lesser the amount of water per make-up, the more "on time" or actual humidifying time will occur thus improving control accuracy. This is especially true when modulating control of the steam input to the humidifier is used.

Figure 8-1:

This piping method is recommended when obstruction prevents dispersion tube from being continuously pitched back to the humidifier.

4" Minimum

Air Gap

OM-702

Obstruction

STS Humidifier

¾" Tubing

Funnel or Floor Drain*

* Note: Refer to governing codes for drain pipe size requirements.

Page 9

PIPING

Potable Water

For water less than 10 grains per gallon hardness the skimmer system alone, without softening, usually provides a full season or more of humidification without a need for cleaning the evaporator.

For water hardness above 10 grains per gallon and where softened water is not available the timer operated drain/ flush feature is available. The humidifier control module contains an integral adjustable timer which accumulates the "on" or actual humidifying time of the unit. When this accumulated time reaches the amount previously pre-set in the control module, the drain/flush cycle is activated.

Drain Piping

A drain line should be extended from the skimmer/drain connection to a sanitary waste. A water seal should be provided in the drain line of sufficient height to contain the pressure developed within the humidifier. Without this, steam will be forced through the drain line which would be objectionable. The depth of the water seal must be sufficient to overcome the static pressure of the air handling system plus the pressure developed by the humidifier itself. (Refer to table 11-1 on page 11.)

Figure 9-1: This piping method is recommended when

humidifier must be mounted higher than the duct.

STS Humidifier

1½" S.S. Tubing Tee (supplied by others)

Air Gap

Funnel or Floor Drain*

OM-703

* Note: Refer to governing codes for drain pipe size requirements.

Page 10

PIPING

Figure 10-1 - Piping of STS® 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 rise feeding the steam valve of the STS. Failure to install this trap will cause water hammer, which could damage the STS heat exchanger.

Figure 10-1 Figure 10-2

Steam Main

Alternate Vacuum Breaker Position

Figure 10-2 - Depicts the same supply configuration, however the condensate return main is above the STS and the condensate must be "lifted". Lifts in excess of six inches per PSI steam inlet pressure should not be attempted. Check valves down stream of both steam traps are necessary to avoid hammer and associated problems.

In both instances, Figure 10-1 and 10-2, vacuum breakers are necessary to ensure condensate can drain from the heat exchanger when the steam valve closes.

Steam Main

Alternate Vacuum Breaker Position

12"

End of Branch Trap (by others)

Trap "A"

12"

Vacuum Breaker (by others)

Swing Check Valves (by others)

Gravity Condensate Return

OM-586

12"

Vacuum Breaker (by others)

Swing Check Valves (by others)

To Elevated Condensate Return

OM-586

Page 11

PIPING DIAGRAMS: STEAM, WATER AND DRAIN

Figure 11-1: Standard STS

Water Supply Shut Off Valve (not provided)

To Water Supply

Automatic Steam Valve

To Steam Supply

Steam Trap

Condensate Return

Needle Valve

Water Strainer

Water Seal

¼" NPT FillMake-Up Valve

Air Gap

Heat Exchanger

Skimmer Tube

Clean-Out Plate

Manual drain or Optional Motorized Drain Valve

Open Drain

OM-471

Note: Refer to governing codes on drain pipe sizing requirements.

Table 11-1: Water Seal Height Recommendations

Water S e a l H e ig ht (H )

Unit Output

(pounds per hour)H(inches)

5-138 12

139-183 15

184 and higher 18

Figure 11-2: STS-DI

¼" NPT Water Supply Minimum 25 psi Water Pressure

Automatic Steam Valve

Steam Trap

Condensate Return

Water Seal

Air Gap

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

Manual Drain Valve

Open Drain

Float Valve

Heat Exchanger

OM-487

Page 12

PIPING DIAGRAMS: STEAM, WATER AND DRAIN

Figure 12-1: Alternate Water Seal and Valve Piping

Used when water seal must be elevated above flow line of drain connection (Humidifier near floor). Water seal height recommendations refer to table 11-1.

Water Seal Flow Line Cannot Be Above Skimmer

Skimmer

Drain Connection

Air Gap

ELECTRICAL

The electrical supply is 120 volt, single phase. The control cabinet should be mounted in a location for service. All wiring must be in accordance with all governing codes and the STS® wiring diagram. A wiring diagram is inside the control cabinet. The wiring between the control cabinet and the humidifier must be 105°C rated wire.

Manual Or Optional Motorized Drain Valve

Note: Flow Line At This Point Must Not Be Above Flow Line

Open Drain

At Drain Connection

OM-489

Please refer to the VAPOR-LOGIC2 O&M for electrical connection information on the controller.

Caution: Only qualified electrical personnel should perform installation and start-up procedures.

Page 13

STEAM DISPERSION INSTALLATION

STS Dispersion Tube Installation with Condensate Drain

Vapor Hose

• Vapor hose should be supported to prevent sags or low spots and to maintain a minimum pitch of 2" per foot back to the humidifier.

• When mounting the humidifier above the level of dispersion tube, see page 9.

Failure to follow the above recommendation may result in excessive back pressures being imposed on the humidifier. This in turn may lead to dispersion tube(s) spitting, lost water seals or leaking gaskets. When distance between humidifier and the dispersion tube(s) exceeds 10 feet, consult factory for special recommendations.

Hard Piping

• Hard piping should have a minimum I.D. of 1½".

• A minimum pitch of 2" per foot back to the humidifier should be maintained.

• 90° elbows are not recommended, use two 45° elbows one foot apart instead.

• Thin wall tubing will heat up faster and cause less start up loss than heavywall pipe.

• Insulating the hard piping will reduce the loss in output caused by condensation.

Tube Mounting

• Mount dispersion tube level.

• Best vapor absorption occurs

when dispersion tube discharges against the air flow.

**Return line piping material

must be suitable for 212° F (100°C) water.

Minimum Condensate Drain Line Sizing

• One or two tubes: 3/4" I.D.

• Three or more tubes - 1" I.D.

Figure 13-1: Single Tube

2.5"

Movable Escutcheon Plate (Plate can be mounted within limits of 2.5".)

1.5"

2.5"

OM-351

3.25"

¼" NPT End

Figure 13-2: Multiple Tube with Condensate Wasted to Floor Drain

Dispersion Tube

1-½" Dia. Vapor Hose or Hard Tubing

STS® Humidifier

OM-1020

Water Seal (5" approx.)

Insertion Length

Pre-molded High Temperature Resin Steam Inserts

½" O.D.Copper Tubing (condensate drain)

Dispersion Tube

Duct

6" Min.

½" O.D. Condensate Drain Tube

Condensate Drain Tube by Others** (3/4" minimum)

Floor Drain*

* Note: Refer to governing codes for drain pipe size requirements.

Figure 13-3: Multiple Tube with Condensate Return to Humidifier

Dispersion Tube

Duct

Dispersion Tube

1-½" Dia. Vapor Hose or Hard Tubing

STS Humidifier

½" Air Vent

6" Min.

Water Seal (5" approx.)

½" O. D. Condensate Drain Tube

Refer to Water Seal Height table 17-1, page 17

Mounting Bracket

Air Flow

OM-1021

¾" Condensate Return Connection (on face plate)

Condensate Drain Tube by Others ** (3/4" minimum)

* Note: Refer to governing codes for drain pipe size requirements.

Page 14

STEAM DISPERSION INSTALLATION

Selecting the Location:

A. It is very important that the dispersion method be

located where the water vapor being discharged will be carried off with the airstream and will not cause condensation or dripping from the duct.

B. In general, the dispersion method is best placed

where the air can most readily absorb the moisture being added without causing condensation at or after the unit. This will normally be after the heating coil or where the air temperature is highest.

C. Do not place the dispersion method too close to the

intake of a high efficiency filter. The filter may remove the visible moisture and become waterlogged.*

D. Do not place dispersion method where water vapor

will impinge on a metal surface.

E. Do not place the dispersion method too close to a

split in the duct. The unit may put more moisture in one branch then the other.

Installation Above Valuable Equipment

Water piping and humidifiers should not be installed above expensive apparatus or equipment. The risk of a broken water pipe, leaking valve gland, condensation or other water leaks may occur causing serious damage and costly repairs to the equipment below.

Where this type of installation cannot be avoided install a drip tray constructed of galvanized sheet under the humidifier, valve, etc. to catch any possible water drip.

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 rather than the drip pan.

Figure 14-1: Installation Above Valuable Equipment

This length of duct should have sealed seams.

Humidifier2'

Air Flow

STS Humidifier

Drip Pan

Refer to governing codes regarding drip pan depth and drain pipe size requirements.

* The distance steam will travel within a given airstream is predictable and can be determined using the STS catalog.

If this has already been done, the travel distance should be specified; if not, consult the STS catalog or contact you DRI-STEEM representative or the DRI-STEEM factory.

Vapor Absorption Area

Allow 12"-18" space for cover removal during maintenance.

Ceiling Line

OM-59

Page 15

RAPID-SORB® ASSEMBLY AND INSTALLATION

Horizontal Duct Installation

1. Unpack Shipment and verify receipt of all

RAPID-SORB components with packing list. Report any shortages at once to the DRI-STEEM factory.

2. Provide necessary access around and into duct work.

3. Locate 1" x 1½" stainless steel channel inside duct

centered between duct side walls. Hang channel from top of duct with the two mounting holes provided.

4. Locate dispersion tubes and slide hose cuffs over end

of each tube, include a pair of hose clamps.

5. Note direction of air flow within duct then arrange each

dispersion tube so steam will blow perpendicular to the air flow. Use the hex bolts provided to attach tubes to overhead 1" x 1½" channel. Do not secure. On units with the header mounted outside the duct, punch-out necessary clearance holes in base of duct to slide dispersion tubes up from bottom (see figure 15-2).

6. For a Header Inside the Duct (See figure 15-1.):

Punch or cut out necessary clearance holes for RAPID-SORB header. Slide header into the duct, position header and slide the dispersion tube hose cuffs or slip couplings over the header dispersion tube nipples.

Position the header so vertical dispersion tubes are perpendicular to duct and pitch the header toward condensate drain. Secure header to the mounting bracket. Use escutcheon plates to secure header where it enters the duct.

7. Connect a condensate drain to header, provide the water trap as shown and run to open drain, sized per governing codes.

8. Attach the header swivel hose connector to main header using the hose cuff and clamps provided, do not secure.

9. Route the necessary number of vapor hoses or pipes from the humidifier tank, position connector to accept the hoses or pipes and secure.

Note: Refer to page 10 for vapor hose information on routing and for alternate vapor hose installation methods.

Figure 15-1: RAPID-SORB Unit

Header Inside Duct

S.S. Dispersion Tube

Orificed Tubelets

Hose Cuff

Pitch 1/8" per foot (minimum)

Header

Optional companion flange connection

1" x 1-1/2" 304 S.S. Channel

Condensate Drain, 3/4" NPT

3/4" Copper Min.

Air Gap

Open Drain

Duct

Support Bolt (By Installer)

6" Min.

5" Min.

Check that the dispersion tubes release steam perpendicular to the air flow. Secure tubes to the overhead channel. Secure the channel to the duct, and secure hose cuffs or slip couplings over tube and header tube nipples.

For a Header Outside the Duct (see figure 15-2.): Position header under dispersion tubes, then slide hose cuffs or slip couplings over header dispersion tube nipples.

Position the header so dispersion tubes are perpendicular to duct and pitch the header to condensate drain. Secure dispersion tubes in place with the tube escutcheon plates provided.

Check the position of the tubes for steam release perpendicular to the air flow. Secure tubes to the overhead channel, and secure channel to the duct. With header pitched to condensate drain, slip hose cuffs or slip couplings over tube nipples and secure.

Figure 15-2: RAPID-SORB Unit

Header Under Duct

Duct

Bolt

Support Bracket

Orificed Inserts

View A-A

Hose Cuff

Hose Clamps

STS

S.S. Dispersion Tube

Pitch 1/8"/foot (min.)

Header Connection

Condensate Drain, ¾" NPT

¾" Copper Min.

Open Drain

1" x 1½" 304S.S.

Duct

Escutcheon Plate

Mounting Bracket

6" Min.

5" Min.

Air Gap

Page 16

RAPID-SORB® ASSEMBLY AND INSTALLATION

Vertical Duct Installation

Install the RAPID-SORB® with dispersion tubes and header pitched to condensate drain as shown in figures 16-1,16-2, and 16-3.

Figure 16-1: Plan View

1/8" per foot pitch minimum

Steam Supply

Figure 16-3: Elevation View Tube with Drain

3/4" NPT Coupling

6" Min.

5" Min.

Airflow

Recommended 1/4" per foot pitch

1/4" NPT

Drain

Condensate Drain

Figure 16-2: Elevation View Tube without Drain

Airflow

Recommended 2" per foot pitch

6" Min.

5" Min.

Table 16-1*: Maximum Steam Carrying Capacity in Lbs/Hr and Kg/Hr

Vapor Hose

Hose I.D.

/2" (38 mm) 150 lbs/hr 68 kg 11/2" (38 mm) 150 lbs/hr 68 kg/h

2" (50 mm) 250 lbs/hr 115 kg 2" (50 mm) 220 lbs/hr 100 kg/h

Developed Length

of 10’ (3.0 Meters)* *

Copper or Stainless Steel Tubing and

Schedule 40 Steel Pipe

Tube or

Pipe Size

3" (75 mm) 450 lbs/hr 205 kg/h 4" (100 mm) 750 lbs/hr 340 kg/h 5" (125 mm) 1400 lbs/hr 635 kg/h 6" (150 mm) 2300 l bs/hr 1043 kg/h

Base on Developed

Length of 20’ (6 Meters)**

Open Drain

- - - - Dashed line indicates field piping.

* Based on total pressure drop in piping/hose of 5" (12.65 mm) W.C. ** For developed length add 50% to measured length for pipe fittings. Note: To minimize lossof humidifier capacity and efficiency, it is recommended that tubing/piping be installed.

Page 17

START-UP AND OPERATION

Figure 17-1: Reliable Electronic Probe Control Maintains Water Level

Probe Housing

Probe Rod

Water Levels

Probe

OM-270

A- Fill Valve Closes

B - Fill Valve Opens

C - Low Water Indication

A simple three-probe conductivity sensor cycles a solenoid-operated water fill valve to maintain the proper water levels.

The STS® humidifier is provided with a standard VAPOR-LOGIC

microprocessor control system, see the

VAPOR-LOGIC2 Installation and Operations Manual for more information. Then continue reading this manual beginning at the maintenance section on page 20.

Water Control with VAPOR-LOGIC

When the power is activated the solenoid-operated water fill valve will open, filling the evaporating chamber. Filling will continue until water reaches level A, at which time the fill valve will close. To ensure that the water seal is filled with water, disconnect probe plug and cable from probe rod assembly (located on face plate), allowing the fill valve to re-energize and overfill humidifier tank. This process will take only seconds; probe plug and cable must then be reconnected.

Water Refill

During operation, the water line will drop to level B. At this level the fill valve opens, and remains open until the water line returns to level A.

Adjustable Surface Skimmer

Each time the evaporating chamber refills, the upper ¼" of water is immediately drained off through the skimmer. This carries away the mineral residue formed during the previous evaporating cycle. This skimming action effectively removes most of the mineral concentration in much the same way as the surface blowdown does in a steam boiler. This simple device greatly reduces the frequency of cleaning the evaporating chamber.

Note: Preferably this humidifier should be supplied with softened water. However, the probe type level control system requires water conductivity of 100 micromhos/cm (2 grains/gal) minimum to function and may not operate in water treated by the reverse osmosis or deionizing process. Specially designed STS Model DI humidifiers are available for use with these water types.

Page 18

RECOMMENDED MAINTENANCE

Caution: Allow unit to cool before performing any mainte-

nance. Manually open the drain valve and the fill valve will be energized. Let the fill water run until the tank is cooled then shut off the contractor/field installed supply water valve.

STS® is designed to deal with dissolved minerals in one of two ways depending on the degree of hardness. For light to moderate hardness (up to 10 grains per gallon) the surface skimmer action plus periodic cleaning is usually adequate. For high mineral content water (above 10 grains per gallon) a periodic drain and flush along with periodic cleaning may be helpful.

The frequency of cleaning will be dictated by water condition and evaporation load.

Caution: When performing maintenance on the STS always turn off electric power to control panel. Close steam supply and water make-up valves.

Seasonally or as Required

1. Cleaning Tank

Remove loose scale in humidifier tank before the build-up reaches the underside of the heat exchanger(s).

Summer Maintenance

After the humidification season, a complete inspection and cleaning of the heat exchanger, probe control, skimmer, and water chamber is recommended. 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.

Adjusting the Surface Skim Bleed-Off Quantity

The skim time determines the quantity of water skimmed with each fill cycle. The skim time is field adjustable using the VAPOR-LOGIC2 keypad.

Model STS®-DI Only

The humidifier should be inspected for leaks at least annually. All safety devices in the control cabinet should be cycled on and off to verify that they are functioning.

Cleaning the Evaporating Chamber

As long as mineral-free water is used in the STS-DI humidifier, no cleaning or flushing of the evaporating chamber should be necessary.

2. Cleaning Probes

Remove cap assembly and unscrew the probe holder from the STS unit. The scale will easily flake off from the sensing probes. The sensing portion (bottom 3/8") of the probe should be brushed clean with stainless steel wool. Re-install the probe holder with arrows up and “top” marking at the top.

3. Cleaning Skimmer Tube

Remove the elbow section of the skimmer and rotate tube so that loosened material will drop out. Loosen deposits with a long tool such as a screwdriver or section of small diameter pipe and reassemble elbow. Skimmer drainage should be verified by visual inspection once per week. Water should drain from skimmer drain pipe after each fill cycle. (For cleaning piping, disconnect and flush out. If mineral deposits have restricted the flow, replace piping.)

4. Inspect Gaskets

Replacement procedures are provided with new gaskets.

Page 19

STS-DI START-UP AND RECOMMENDED MAINTENANCE

Introduction

After the system has been properly installed and connected to both electrical and water supplies, it may then be started.

Mounting

Check mounting to see that unit is level and securely supported before filling with water.

Piping

Verify that all piping connections have been completed as recommended and that steam and water pressures are available.

Electrical

Verify that all wiring connections have been made in accordance with the STS® wiring diagram.

Control System

For VAPOR-LOGIC to the Installation and Operations Manual enclosed with the product shipment.

microprocessor control system, refer

Control Circuits

a) Adjust humidistat to “call” setting. b) Open shut-off valve on water supply line.

Water should flow through float valve. c) Turn electric power on to control cabinet. d) Fill the water seal in drain line by manually

opening drain valve for a few seconds. e) Open steam stop valve. Steam should be heard

passing through the automatic steam valve into the

humidifier heat exchanger. f) Check out function of field installed air flow

switch, high limit duct humidistat, and controlling

humidistat to ensure that they are in control of

steam valve.

Recommended Maintenance-STS-DI System (deionized water)

The STS-DI humidifier does not require regular maintenance. A periodic visual inspection is recommended to identify gasket or piping leaks. Control circuit and safety switches should be checked to verify they properly control the steam valve.

Caution: Overtightening cover will cause leaks.

All cover knobs are turned down at the factory until the bottom of the knob makes contact with the flange, then one half turn further. If more compression is required, turn all knobs a half turn more. Do not turn knobs more than a half turn before identifying that a leak still exists.

Page 20

TROUBLE SHOOTING GUIDE

Symptom Possible Cause Recommended Action

Humidifier Will Not Heat No control transformer output.

Humidistat is not calling. Saftey controls open (high limit,

air proving, etc...)

Faulty control board.

Probe corrosion.

Steam stop valve closed. Steam trap plugged. Low or no steam. Steam strainer plugged.

Humidifier Will Not Fill No water pressure.

Faulty water fill valve.

Plugged water strai ner. Plugged valve. Faulty control board.

Humidifier Does Not Stop Filling Lack of tank-to-probes continuity.

Water conductivity less than 100 micromhos/cm minimum (2 grains per gallon)

Verify control voltage. Set humidistat to "call". Inspect for faulty humidistat.

Check safety controls.

Verify control voltage and probe. Wires are connected correctly.

Replace probes*.

Verify val ve is opened. Clean trap body. Verify steam is present. Clean strainer.

Verify manual water supply valve is open.

Verify action of fill solenoid valve, verify contol voltage present at coil. Audible click should be heard as solenoid operates.

Open strainer. Clean valve. Verify control voltage.

Jumper terminals 1 & 3 if water sops, verify tank ground to term 3; check water supply conducti vi ty; then consult factory .

Manual drain is not fully closed. Fill valve is stuck open. Fill valve installed backwards.

Low Output Automatic drain valve not seating.

Manual drain is not fully closed. Excessive skimming amount. Fill valve is stuck open.

Low supply steam pressure.

Steam valve inoperable.

Steam trap blocked.

Scale coated heat exchanger.

Make up Water Va lv e Sh ort C irc uits El ectrode probes may be

incorrectly wired. Probes are scale coated.

*Although the three stainless steel electrode probes will eventually erode due to corrosion they are usually functional for up to approximately 5000 hours of operation.

Close manual ball valve. Check valve for foreign matter. Check for correct water flow, through

valve, note arrow.

Clean ball and seat of valve. Close manual ball valve.

Red uce ski mme r o r skim time.

Check valve for foreign matter. Check steam supply pressure. Not opening fully. Not passing condensate. Clean heat exchanger.

Confirm that wi ring agrees with diagram.

Clean probes.

Page 21

Figure 21-1: STS® Humidifier

REPLACEMENT P ARTS

Table 21-1: STS Humidifier Table 21-1: continued

No. Description Part No.

1 Tank, STS-25 164404-025 *

1 Tank, STS-50 164404-050 *

1 Tank, STS-100 164404-100 *

1 Tank, STS-200/400 164404-400 *

1 Tank, STS 800 164404-800 *

2 C ov er, STS-25 165359 *

2 C ov er, STS-50 165360 *

2 C ov er, STS-100 165365 *

2 C ov er, STS-200/400/800 165369 *

3 Gasket, Cover, STS-25 160690-224 *

3 Gasket, Cover, STS-50 160690-240 *

3 Gasket, Cover, STS-100 160690-340 *

3 Gasket, Cover, STS 200/400/800 1606 90-200 *

4 Knob, T-Handled Utility 700725

5 Heat Exchanger, STS-25S 164420-101 *

5 Heat Exchanger, STS-50S 164420-102 *

5 Heat Exchanger, STS-100S 164420-103 *

5 Heat Exchanger, STS-200S 164420-104 *

* Specify humidifier model and serial numbers when ordering.

No. Description Part No.

6 Heat Exchanger, STS-25C 1 64 43 6-1 01 *

6 Heat Exchanger, STS-50C 1 64 43 6-1 02 *

6 Heat Exchanger, STS-100C 164436-103 *

6 Heat Exchanger, STS-400/800C 164436-104 *

7 Support, Heat Exchanger Mtg Plate 124437

8 Cl ean Out Plate 165470

9 Gasket, Clean Out and Mtg Plate 308220

10 Valve, ¾" Ball (Manual Drain) 505011

11 Gasket, Probe/Float Pl ate 308220 -001

12 Probe Plate, STS-25/50/100 164411

12 Probe Plate, STS-200/400/800 164411-002

13 Baffle, Probe Plate 124443

14 Probe Plug 406050-002

15 Probe Assembly 406060

16 Valve, ¾" Electric (Auto D rain) 505400-001

17 F ill Valve, ¼" Solenoid, .125, STS-25, 50, 100 505084

17 F ill Valve, ¼" Solenoid, .281, STS -400, 800 505085

18 Strainer, ¼" Sediment 300050

19 Valve, Needl e ¼" 505070-001

* Specify humidifier model and serial numbers when ordering.

OM-518

Page 22

Figure 22-1: STS®-DI Humidifier

REPLACEMENT PARTS

OM-519

Table 22-1: STS-DI Humidifier Table 22-1: continued

No. Description Part No.

1 Tank, STS-25 164404-025 *

1 Tank, STS-50 164404-050 *

1 Tank, STS-100 164404-100 *

1 Tank, STS-200/400 164404-400 *

1 Tank, STS 800 164404-800 *

2 Cover, STS-25 165359 *

2 Cover, STS-50 165360 *

2 Cover, STS-100 165365 *

2 Cover, STS-200/400/800 165369 *

3 Gasket, Cover, STS-25 160690-224 *

3 Gasket, Cover, STS-50 160690-240 *

3 Gasket, Cover, STS-100 160690-340 *

3 Gasket, Cover, STS 200/400/800 160690-200 *

4 Knob, T-Handled Util ity 700725

No. Description Part No.

6 Heat Exchanger, STS-25C 164436-101 *

6 Heat Exchanger, STS-50C 164436-102 *

6 Heat Exchanger, STS-100C 164436 -103 *

6 Heat Exchanger, STS-400/800C 164436-104 *

7 Support, Heat Exchanger Mtg Plate 124437

8 Clean Out Plate 165470

9 Gasket, Cl e an Out and Mtg Pl ate 3 08 22 0

10 Valve, ¾" Ba l l (Manual Drai n) 505011

11 Gasket, Probe/Float Pl ate 308220-001

12 Float Plate, STS-25/50/100 164410

12 Float Plate, STS-200/400/800 164410-002

13 Baffle, Probe Plate 124442

14 Float Valve Assembly STS 25-400 505210

14 Float Valve Assembly STS 25-800 505300

5 Heat Exchanger, STS-25S 164420-101 *

5 Heat Exchanger, STS-50S 164420-102 *

5 Heat Exchanger, STS-100S 164420-103 *

5 Heat Exchanger, STS-200S 164420-104 *

* Specify humidifier model and serial numbers when ordering.

Page 23

REPLACEMENT PARTS

Figure 23-1: STS® Control Cabinet with VAPOR-LOGIC

Controls

Table 23-1: VAPOR-LOGIC

No. Description Part No.

1 Power Block 408300-001

2 Transformer 408960

3 Ground Lug 40925 0-017

4 LW430, Microprocessor Board 408641

5 LW440, Display Board 408651

Controls

OM-1044

Page 24

TWO-YEAR LIMITED WARRANTY

DRI-STEEM Humidifier Company (“DRI-STEEM”) 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 twenty-seven (27) months from the date DRI-STEEM ships such product, whichever date is the earlier.

If any DRI-STEEM product is found to be defective in material or workmanship during the applicable warranty period, DRI-STEEM’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 DRI-STEEM’s election. DRI-STEEM shall not be liable for any costs or expenses, whether direct or indirect, associated with the installation, removal or re-installation of any defective product.

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

DRI-STEEM’s limited warranty is made in lieu of, and DRI-STEEM 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.

DRI-STEEM 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 DRI-STEEM has notice of the possibility of such damages.

By purchasing DRI-STEEM’s products, the purchaser agrees to the terms and conditions of this limited warranty.

14949 Technology Drive • Eden Prairie, MN 55344 Phone: (952) 949-2415 • Fax: (952) 949-2933 E-Mail: sales@dristeem.com • Web: www.dristeem.com International Office: Bell Place, Bell Lane • Syresham, Brackley • NN13 5HP, U.K. Phone: +44 1280 850122 Fax: +44 1280 850124 E-Mail: 106277.1443@compuserve.com

Continuous product improvement is a policy of DRI-STEEM Humidifier Company therefore,

product features and specifications are subject to change without notice.

DRI-STEEM, RAPID-SORB, STS, VAPOR-LOGIC and VAPOR-LOGIC2 are Registered Trademarks of the DRI-STEEM Humidifier Company.

TEFLON is a Registered Trademark of Dupont.