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

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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

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

2

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

3

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

F

G

HregnahcxetaehotedismorfecnatsiD 52.33852.33852.33852.33852.33852.338

JtelniylppuS

KteltuonruteR

regnahcxetaehdnocesfo

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

F

G

HregnahcxetaehotedismorfecnatsiD 52.33852.33852.33852.33852.338

JtelniylppuS

KteltuonruteR

regnahcxetaehdnocesfo

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

4

ISPaPkISPaPkISPaPkISPaPk

5430196310951301

01

5

52

11

hpp

h/gk

hpp

03

41

hpp

06

hpp
051

hpp
071

CNS004-STS**

hpp

212

CNS008-STS**

hpp

55

h/gk

hpp

72

011

h/gk

hpp

86

092

h/gk

hpp

77

293

h/gk

hpp

69

528

h/gk

hpp

03

h/gk

hpp

52

57

h/gk

hpp

05

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*

41

53

h/gk

43

h/gk

46

h/gk

361

h/gk

052

h/gk

794

h/gk

61

hpp

h/gk

08

63

hpp

h/gk

051

86

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

02

9

07

23

C52-STS

hpp

h/gk

hpp

05

32

C05-STS

hpp
001

C001-STS

hpp
003

C004-STS

hpp
056

C008-STS

hpp

051

h/gk

hpp

54

003

h/gk

hpp

631

085

h/gk

hpp

592

5721

h/gk

hpp

001

h/gk

hpp

86

002

h/gk

hpp

631

004

h/gk

hpp

362

027

h/gk

hpp

875

0051

h/gk

hpp

erusserpmaetS*

54

h/gk

19

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

45

hpp

h/gk

042

901

hpp

h/gk

084

812

hpp

h/gk

097

853

hpp

h/gk

0061

627

hpp

h/gk

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

C

Table 5-1: Humidifier weights

Front view

¼" NPT water make­up valve

J

K

A

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

D

E

¾" drain

H

B

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

Front view

¼"NPT water
make up valve

5

/16" dia

J

K

A

mounting bolt
holes

G

F

E

D

H

B

Note:

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

¾" drain

OM-336

5

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)

A

Optional wall
brackets, two
required

snoisnemiD

tinUAB

05,52STS"¾51"62

001STS"¾02"23

,002STS

008,004

B

----

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

6

12" to 18"

Two-Piece Escutcheon Plate

Cover of STS Humidifier

OM-66

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

7

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

8

Obstruction

STS Humidifier

H

¾" Tubing

Funnel or Floor
Drain*

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