DriSteem HUMIDI-TECH Specification

Brand: DriSteem

Model: HUMIDI-TECH

Category: Dehumidifiers

Type: Specification

Humidi-tech

Electric Humidifier

Installation, Operation,

and Maintenance Manual

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WARNING

CAUTION

Indicates a hazardous situation that could result in death or

serious injury if instructions are not followed.

Indicates a hazardous situation that could result in damage to

or destruction of property if instructions are not followed.

WARNING

Attention installer

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

qualiﬁed HVAC and electrical contractors and in compliance with local, state, federal, and governing codes. Improper

installation can cause property damage, severe personal injury, or death as a result of electric shock, burns, or ﬁre.

DRI-STEEM Technical Support: 800-328-4447

Read all warnings and instructions

Read this manual before performing service or maintenance procedures on any part of the system. Failure to follow all

warnings and instructions could produce the hazardous situations described, resulting in property damage, personal

injury, or death.

Failure to follow the instructions in this manual can cause moisture to accumulate, which can cause bacteria and mold

growth or dripping water into building spaces. Dripping water can cause property damage; bacteria and mold growth

can cause illness.

Hot surfaces and hot water

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

Disconnect electrical power

Disconnect electrical power before installing supply wiring or performing service or maintenance procedures on any

part of the humidiﬁcation system. Failure to disconnect electrical power could result in ﬁre, electrical shock, and other

hazardous conditions. These hazardous conditions could cause property damage, personal injury, or death.

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

shock or ﬁre. Do not remove humidiﬁer electrical panel cover, heater terminal cover, or subpanel access panels until

electrical power is disconnected.

Follow the shutdown procedure in this manual before performing service or maintenance procedures on any part of

the system.

Electric shock hazard

If the humidiﬁer starts up responding to a call for humidity during maintenance, severe bodily injury or death from

electric shock could occur. To prevent such start-up, follow the procedure below before performing service or

maintenance procedures on this humidiﬁer (after the tank has cooled down and drained):

1. Use Vapor-logic

4 keypad/display to change control mode to Standby.

2. Shut off all electrical power to humidiﬁer using ﬁeld-installed fused disconnect, and lock all power disconnect

switches in OFF position.

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

CAUTION

Hot discharge water

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

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

Humidiﬁers equipped with a water tempering device such as a DRI-STEEM Drane-kooler need fresh make-up water in order

to function properly. Make sure the water supply to the water tempering device remains open during draining.

Excessive supply water pressure

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

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Warnings and cautions................................. ii

Overview

Product overview

Tap/softened water

...................................2

DI/RO water option

.................................. 2

Water type conversion

................................2

Dispersion options

...................................3

Capacities, electrical specifications, and weights

..............4

Dimensions

..............................................5

Installation

Selecting a location

Humidifier

.......................................... 6

Dispersion control devices

............................6

Mounting the humidifier

..................................7

Piping:

Tap/softened water

.....................................8

DI/RO water option

....................................9

Supply water and drain piping

..........................10

Drane-kooler

.........................................11

Wiring

.................................................12

Humidistat and transmitter placement

.....................14

Dispersion:

Selecting the dispersion assembly location

................15

High-efficiency Tube option

............................15

Interconnecting piping requirements

Connecting to humidifier with vapor hose

.............16

Connecting to humidifier with tubing or pipe

..........17

Drip tee installation

...................................18

SDU-I and SDU-E

Mounting SDU-I and SDU-E

......................... 19

SDU-I: Instant, internal absorption

....................19

SDU-E: Higher capacity

.............................19

SDU-E condensate drain connection

..................22

Mounting SDU-E

...................................22

SDU-E rise, spread, and throw

........................ 23

Single tube

...........................................24

Rapid-sorb

Pitch requirements

..................................27

Header outside of duct, horizontal airflow

. . . . . . . . . . . . . . 28

Header inside of duct, horizontal airflow

............... 30

Steam supply connections to Rapid-sorb header

........32

Condensate drain connections to Rapid-sorb header

....32

Ultra-sorb

............................................ 32

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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

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– Humidi-tech

– Ultra-sorb

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manuals (IOM)

– Ultra-sorb

– Vapor-logic4 controller (includes

humidifier operation and troubleshooting)

t

DRI-STEEM Humidification System Design

Guide

(includes steam loss tables and

general humidification information)

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Keypad/display and troubleshooting

The

Vapor-logic4 Installation and Operation

Manual,

which was shipped with your

humidifier, is a comprehensive operation

manual. Refer to it for information about

using the keypad/display and Web interface,

and for troubleshooting information.

Download DRI-STEEM literature

Most DRI-STEEM product manuals can be

downloaded, printed, and ordered from our

web site: www.dristeem.com

Operation

Start-up procedure

......................................33

Start-up checklist

........................................34

Maintenance

Tap/softened water

Water quality and maintenance

.......................35

Skim duration

......................................35

Cool down humidifier

...............................36

Inspection and maintenance

..........................36

Off-season shut-down procedure

.....................39

DI/RO water option

Cool down humidifier

...............................40

Inspection and maintenance

..........................40

Off-season shut-down procedure

.....................41

Replacement parts

Humidifier .............................................42

SDU-E

.................................................44

SDU-I

.................................................45

Subpanel

...............................................46

Warranty

................................... Back cover

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Bracket under evaporating chamber

allows easy removal for cleaning

Removable

evaporating

chamber

Water ﬁll

access hole

Incoloy alloy-sheathed

immersion heaters

Keyholes

for wall

mounting

Water ﬁll

Electrical area

Skimmer port

and overﬂow

drain

Electrical conduit knockouts

Flexible vapor hose,

pipe, or tubing

connects to dispersion

tube(s) or to an SDU

Duct

Single

dispersion

tube with

condensate

return line

Figure 2-3:

Installation overview

(Humidi-tech for tap/softened water shown)

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OM-82-4

Notes:

See Pages 8 and 9 for detailed installation

drawings.

Damage caused by chloride corrosion is not

covered by your DRI-STEEM warranty.

Overview

Figure 2-2:

Water level control for DI/RO water

option humidifier

Supply water connection

Float rod

Float ball

OM-7396

Humidifiers using tap or softened water

control water levels electronically using a

three-rod probe. The controller responds

with the above actions when the water level

reaches each rod.

Figure 2-1:

Water level control for tap/softened

water humidifier

VLC-OM-030

Fill valve opens when water

level is below this probe.

Low-water cutoff. Power to

heaters is cut if water level

drops below this probe.

Fill valve closes when water

level rises to this probe.

Humidifiers using DI/RO water control water

levels using a float valve and low-water

cutoff switch.

Tap/softened water

Humidi-tech humidifiers with tap/softened water (shown above)

use electricity to heat tap or softened fill water into steam for

humidification. A conductivity probe monitors the water level;

therefore, water conductivity must be at least 30 μS/cm for proper

operation. Humidi-tech with tap/softened water will not operate

with DI/RO water. For DI/RO water, use Humidi-tech with the

DI/RO water option.

DI/RO water option

Humidi-tech humidifiers with DI/RO water systems (systems using

deionized water or water that has been treated using reverse osmosis)

use electricity to heat DI/RO fill water into steam for humidification.

Water level is controlled with a float valve and low water cutoff

switch. Float valves are compatible with DI/RO water only.

Humidifiers with the DI/RO water option are virtually maintenance

free and require little or no downtime.

Water type conversion

Humidi-tech tap/softened water humidifiers can be converted in

the field for use with DI/RO water, and Humidi-tech DI/RO water

humidifiers can be converted in the field for use with tap/softened

water. Contact your DRI-STEEM representative or distributor for

parts and instructions.

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Dispersion options

In addition to single tube dispersion, shown in Figure 2-3,

the dispersion options shown on this page are available for

Humidi-tech humidifiers. See the installation instructions

beginning on Page 19.

Overview

Figure 3-3:

SDU mounting options

OM-56-1

Remote from humidiﬁer

Directly above humidiﬁer

OM-55-1

Air

intake

vents

Steam

outlet

Figure 3-1:

Ultra-sorb dispersion

OM-636-1

Figure 3-2:

Rapid-sorb dispersion

OM-637-1

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Overview

Figure 4-1:

Steam outlet connections

DC-1168

Hose clamp (for vapor hose)

Table 4-2:

Steam connection sizes

HT model Steam outlet

2, 4, 6, 8

1 ½" hose or

BSP connection

10*, 12*, 14*, 16*

1 ½" or 2" hose or

BSP connection

21, 25, 30, 34

2" hose or

BSP connection

* If using with an SDU-E (Space Dispersion Unit

External Absorption), the Humidi-tech steam outlet

must be 2" to match the SDU-E steam inlet.

The steam outlet is designed to connect to a

vapor hose or BSP connection.

Tap/softened water Humidi-tech shown.

Table 4-1:

Humidi-tech electrical specifications, capacities and weights

HT model Single-phase 230V Three-phase 400V

Shipping

weight (kg)

Operating

weight (kg)

kW Steam capacity (kg/h)

I max. (A) Steam capacity (kg/h) I max. (A)

2 2.5 8.0 — — 37 44

4 5.0 16.0 5.4 8.7* 37 44

6 7.5 24.0 8.2 13.0* 41 56

8 10.0 31.9 10.9 17.3* 41 56

10 12.5 39.9 13.6 15.2* 43 64

12 15.0 47.9 16.3 17.3 43 64

14 — — 19.1 20.2 43 64

16 — — 21.8 23.1** 43 64

21 — — 28.6 30.3** 44 70

25 — — 34.0 36.1** 44 70

30 — — 40.8 43.3** 47 72

34 — — 46.3 49.1** 47 72

For wire sizing, the highest leg draw is shown due to current imbalance.

** No available SDU option for these models.

Notes:

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and operating weights:

SDU-E: 5.5 kg

SDU-I: 4.0 kg

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Overview

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Figure 5-1:

Humidi-tech dimensions

DC-1167

50 mm

Venting

13 mm hole in base for water ﬁll line

Steam outlet

Top view

614 mm

Left side view Front view

Bottom view

57 mm

409 mm

472 mm

57 mm

614 mm

19 mm

276 mm

50 mm

25 mm

57 mm

38 mm

146 mm

DN20 pipe thread frame drain

DN20 pipe thread tank drain

16 mm

38 mm

146 mm

Control or SDU wiring knockout

Power wiring knockout

Control or SDU wiring knockout

Power wiring knockout

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Humidifier

When selecting a location for the humidifier, consider the

following:

t Proximity to the duct

Install the humidifier near the air duct system where

the dispersion assembly will be located. The maximum

recommended length for steam hose connecting a single

humidifier to a dispersion assembly is 3 m. The maximum

recommended developed length for tubing or pipe connecting a

single humidifier to a dispersion assembly is 6 m.

For more information about installing dispersion assemblies, see

“Dispersion,” beginning on Page 15.

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The recommended installation location for the dispersion

assembly is at an elevation higher than the humidifier. However,

if the dispersion assembly must be installed at an elevation lower

than the humidifier, install a drip tee and drain. See “Drip tee

installation” on Page 18.

Before installing a dispersion assembly or interconnecting

piping, review all pitch requirements in the “Dispersion” section

of this manual.

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Electrical power supply connections are at the lower or upper

right rear corner of the unit. See “Wiring” on Pages 12 and 13.

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Water supply piping and drain connections are at the lower

left rear corner of the unit. See the piping illustrations and

instructions starting on Page 8.

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Install the humidifier on an exterior wall only if the wall is

properly insulated.

Dispersion control devices

See Figure 14-1 for recommended installation locations for the

dispersion assembly and associated control devices.

Installation

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Follow the instructions below for your wall type, and mount the

humidifier level and plumb. See Figures 8-1 and 9-1.

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(6 mm) diameter pilot holes. Secure the cabinet to the wall with

the lag bolts (provided).

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through the wall, the studs, and a backing plate on the other side

of the wall. Secure the cabinet to the wall with a nut and washer.

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Mount spanner boards on the wall, spanning two studs. Locate

one board at the top of the cabinet (for the lag bolts) and the

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cabinet. Secure the cabinet to the spanner boards.

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Mark hole locations, and drill appropriate pilot holes for two

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lead anchors. Secure the cabinet in place with the bolts and

anchors.

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Installation

Figure 7-1:

Humidi-tech clearance recommendations

Top (when SDU is not mounted directly above

the Humidi-tech): 460 mm

Right side electrical

controls: 915 mm

Supporting wall

Front 915 mm

Floor: 610 mm

Left side:

305 mm

Secured to supporting

wall

To dispersion

assembly

DC-1201

Maintain these clearances for service and maintenance.

WARNING

Mounting hazard

Mount humidiﬁer per the instructions

in this manual and to a structurally

stable surface. Improper mounting of

the humidiﬁer can cause it to fall or tip,

resulting in severe personal injury or

death.

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Installation

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Figure 8-1:

Humidi-tech (tap/softened water) field piping overview

Water supply line:

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nonmetallic, the ﬁrst 1 m of water supply

piping from humidiﬁer should be metallic.

Steam vapor hose (maximum run 3 m). May also use pipe or tubing.

See the

DRI-STEEM Design Guide

for maximum pipe or tubing

lengths.

Unions by installer

Shock arrester

recommended to

reduce water hammer

DN20 pipe thread tank

drain, skimmer, and P-trap

piping, rated for 100 °C.

If piping run is over 3 m,

increase pipe to DN32 after

P-trap.

25 mm air gap

Spill funnel. Plumb

to ﬂoor drain.

Open drain required.

See ﬁrst note below.

DN20 pipe thread frame drain and P-trap

piping, rated for 100 °C

Frame drain

Cover

Install plumb

DC-1136

Notes:

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Refer to governing codes for drain pipe size and maximum discharge water temperature.

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prevention is required; however, governing codes prevail.

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t %BNBHFDBVTFECZDIMPSJEFDPSSPTJPOJTOPUDPWFSFECZZPVS%3*45&&.XBSSBOUZ

50 mm

300 mm

50 mm water seal or loop in supply

line to isolate steam from nonmetallic

supply piping

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1JQJOH

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Installation

Figure 9-1:

Humidi-tech (DI/RO water option) field piping overview

DC-1139

Unions by installer

Strainer, by installer

DN20 pipe thread tank drain,

and P-trap piping, rated for

100 °C. If piping run is over

3 m increase pipe to DN32

after P-trap.

25 mm air gap

Spill funnel. Plumb

to ﬂoor drain

Frame drain

Cover

Install plumb

First 1 m of water supply line

should be stainless steel tubing

with a 50 mm water seal

or loop in the supply line to

isolate steam from nonmetallic

supply piping.

50 mm

300 mm

Notes:

to governing codes for drain pipe size and maximum discharge water temperature.

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t %BTIFEMJOFTJOEJDBUFQSPWJEFECZJOTUBMMFS

t 5IFXBUFSTVQQMZJOMFUJTNPSFUIBONNBCPWFUIFPWFSnPXQPSUFMJNJOBUJOHUIFQPTTJCJMJUZPGCBDLnPXPSTJQIPOJOHGSPNUIFUBOL/PBEEJUJPOBMCBDLnPX

prevention is required; however, governing codes prevail.

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t %BNBHFDBVTFECZDIMPSJEFDPSSPTJPOJTOPUDPWFSFECZZPVS%3*45&&.XBSSBOUZ

Open drain required.

See ﬁrst note below.

DN20 pipe thread frame drain and

P-trap piping, rated for 100 °C

Steam vapor hose (maximum run 3 m). May also use pipe or tubing.

See the

DRI-STEEM Design Guide

for maximum pipe or tubing

lengths.

Water supply line:

DN8 connection size

t UPL1BSFRVJSFEXBUFSQSFTTVSF

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1JQJOH

4VQQMZXBUFSBOEESBJOQJQJOH

Installation

Supply water piping may be of any code-approved material (copper,

steel, or plastic). The fill valve connection size is a DN10 pipe

thread fitting. In cases where water hammer may be a possibility,

consider installing a shock arrestor. Water pressure must be

between 175 kPa and 550 kPa.

If water piping to humidifier is nonmetallic, we recommend that

the first 1 m of water supply piping from the humidifier be metallic

with a 50 mm water seal or loop in the supply line to isolate steam

from nonmetallic supply piping.

Drain piping may be of any code-approved material (copper, steel,

or plastic rated for 100 °C minimum). If drainage by gravity is not

possible, use a reservoir pump rated for 100 °C water.

The final connection size is DN20 copper for the tank and frame

drains. Do not reduce this connection size. Pipe the tank and

frame drains separately, as shown in Figures 8-1 and 9-1, to prevent

backflow of drain water into the humidifier cabinet.

If the equivalent length of pipe from the humidifier drain to the

plumbing system drain is more than 3 m, increase the pipe size to

DN32.

See Figures 8-1 and 9-1 for more piping instructions.

Important: Install unions in the water supply and drain lines as

shown in Figures 8-1 and 9-1 to allow tank removal.

Figure 10-1:

Drane-kooler water tempering device

DRI-STEEM's Drane-kooler,

shown mounted to a

humidifier, tempers discharged

water. For other Drane-kooler

mounting options or for more

information, contact your

DRI-STEEM representative/

distributor, or view the

Drane-kooler product data

sheet in the literature section

at www.dristeem.com

OM-7398

CAUTION

Hot discharge water

Discharge water can be as hot as 212 °F

(100 °C) and can damage the drain

plumbing.

To prevent such damage from humidiﬁers

without water tempering, allow the tank

to cool before draining.

Humidiﬁers equipped with a water

tempering device such as a DRI-STEEM

Drane-kooler need fresh make-up water

in order to function properly. Make sure

the water supply to the water tempering

device remains open during draining.

Excessive supply water pressure

Supply water pressure greater than 80

psi (550 kPa) can cause the humidiﬁer to

overﬂow.

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Installation

1JQJOH

%SBOFLPPMFS

Figure 11-1:

Drane-kooler field piping connections

Tank drain

Frame drain

Field piping

Notes:

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t 5PUBMMFOHUIPGQJQFCFUXFFOIVNJEJGFSBOE

%SBOFLPPMFSOPUUPFYDFFEN

%SBOFLPPMFS

1BSU/P/15DPOOFDUJPOT

1BSU/P#41DPOOFDUJPOT

'MPPS

4VQQMZXBUFSTIVUPòWBMWF

6OJPO

7BDVVNCSFBLFS

)PUESBJOXBUFSJOMFU%/

6OJPO

5FNQFSFEXBUFSPVUMFU%/

4VQQMZXBUFSJOMFU%/

UPL1B

.BYJNVNUFNQFSBUVSF¡$

5FNQFSFEXBUFSPVUøPX

MQN

¡$

DC-1160

Figure 11-2:

Lifting drain water

DC-1138

Note:

Use a condensate pump rated for your application.

Pumps are rated by ﬂuid temperature, head (pressure),

and ﬂow (gpm). Contact your local DRI-STEEM

representative for pump selection.

Funnel

Condensate pump

Check valve

Frame drain

Tank drain

Discharge piping

by installer

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Figure 12-1:

Field wiring requirements

Fused

disconnect

(provided by

installer)

Power

supply

(provided

by installer)

OM-1007

Notes:

t $POUSPMXJSJOHBOEQPXFSXJSJOHNVTUCFSVOJO

dedicated or separate earthed metal conduit, cable

trays, or trunking.

t 4FQBSBUFUIFMJOFWPMUBHFXJSJOHGSPNMPXWPMUBHF

control circuit wiring when routing electrical wiring

inside the humidiﬁer cabinet.

t %POPUVTFDIBTTJTPSTBGFUZHSPVOETBTDVSSFOU

carrying commons. Never use a safety ground as a

conductor or neutral to return circuit current.

Installation

8JSJOH

WARNING

Electric shock hazard

Only qualiﬁed electrical personnel

should perform ﬁeld wiring installation

procedures. Improper wiring or contact

with energized circuits can cause property

damage, severe personal injury, or death

as a result of electric shock and/or ﬁre.

Do not remove the humidiﬁer electrical

panel cover or the heater terminal cover

until electrical power is disconnected.

Contact with energized circuits can cause

property damage, severe personal injury,

or death as a result of electrical shock.

Humidifier field wiring

All wiring must be in accordance with all governing codes, and with

the humidifier wiring diagrams. The diagrams are located inside

the removable subpanel cover on the right side of the humidifier

cabinet. Power supply wiring must be rated for 105 °C.

When selecting a location for installing the humidifier, avoid

areas close to sources of electromagnetic emissions such as power

distribution transformers.

The fill valve, drain valve, probes, and temperature sensors use

Class 2, 24 VAC power.

The use of semiconductor fusing sized per IEC 60364 is

recommended.

Grounding requirements

The approved earth ground must be made with solid metal-

to-metal connections and must be a good conductor of radio

frequency interference (RFI) to earth (multistranded conductors).

Ground wire should be the same mm

size as the power wiring or

sized per IEC 60364 requirements.

Proper wiring prevents electrical noise.

Electrical noise can produce undesirable effects on electronic

control circuits, which affects controllability. Electrical noise is

generated by electrical equipment such as inductive loads, electric

motors, solenoid coils, welding machinery, or fluorescent light

circuits. The electrical noise or interference generated from these

sources (and the effect on controllers) is difficult to define, but

the most common symptoms are erratic control or intermittent

operational problems.

Important:

t 'PSNBYJNVN&.$FMFDUSPNBHOFUJDDPNQBUJCJMJUZ

effectiveness, wire all humidity, high limit, and airflow controls

using multicolored shielded/screened plenum-rated cable with

a drain wire for the shield/screen. Connect the drain wire to

the shield/screen ground terminal with wire less than 50 mm in

length.

t %POPUHSPVOETIJFMEBUUIFEFWJDFFOE

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8JSJOH

Figure 13-1:

Shielded/screened cable drain wire connection to lug

Shield/screen ground lug

Vapor-logic4

keypad on front

of cabinet

Microprocessor

board

OM-1505

/PUF

For maximum EMC effectiveness, all humidity, temperature, and airﬂow controls should

be wired using multicolored shielded/screened plenum-rated cable with a drain wire

for the shield/screen. The drain wire should be connected to the shield/screen ground

terminal with its length kept to less than 2" (50 mm).

Humidiﬁer side view

Installation

Table 13-1:

European wiring requirements

230 volt single phase 400 volt three phase

Amps Wire size mm

Ground wire size mm

Amps Wire size mm

Ground wire size mm

0 - 18 2.5 2.5 0 - 15.7 2.5 2.5

18.1 - 24 4 4 15.8 - 21 4 4

24.1 - 30.7 6 6 21.1 - 27 6 6

30.8 - 42.7 10 10 27.1 - 37.5 10 10

42.8 - 57 16 16 37.6 - 51 16 16

57.1 - 75.7 25 16 51.1 - 66.7 25 16

75.8 - 93.7 35 16 66.8 - 82.5 35 16

93.8 - 113.2 50 25 82.6 - 100.5 50 25

113.3 - 144 70 35 100.6 - 128.2 70 35

144.1 - 174 95 50 128.3 - 155.2 95 50

174.1 - 201.7 120 70 155.3 - 179.2 120 70

Table 13-2:

European breaker requirements

I max. A Breaker size

0 - 8.0 10

8.1 - 10.4 13

10.5 - 12.8 16

12.9 - 16 20

16.1 - 20 25

20.1 - 25.6 32

25.7 - 32 40

32.1 - 40 50

40.1 - 50.4 63

50.5 - 64 80

64.1 - 80 100

80.1 - 100 125

100.1 - 128 160

128.1 - 160 200

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Installation

)VNJEJTUBUBOEUSBOTNJUUFSQMBDFNFOU

Humidistat and sensor locations are critical

Humidistat and sensor location have a significant impact on

humidifier performance. In most cases, do not interchanging duct

and room humidity devices. Room humidity devices are calibrated

with zero or little airflow; whereas duct humidity devices require air

passing across them.

Recommended sensor locations (see figure below):

A Ideal. Ensures the best uniform mix of dry and moist air with

stable temperature control.

B Acceptable, but room environment may affect controllability,

such as when sensor is too close to air grilles, registers, or heat

radiation from room lighting.

C Acceptable. Provides uniform mixture of dry and moist air.

If extended time lag exists between moisture generation and

sensing, extend sampling time.

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

if sensor is near an air exhaust return outlet. Typical placement

for sampling a critical area.

& Not acceptable. These locations may not represent actual overall

conditions in the space.

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

passageways, or areas of stagnant airflow.

G Best sensing location for a high-limit humidistat or humidity

transmitter and airflow proving switch.

Figure 14-1:

Recommended sensor location

Outside air

Relief air

Return air

Air handling

unit

8' to 12'

(2.4 m to 3.7 m)

min.

Steam dispersion assembly

Turning vanes

Temperature compensation option: Place a temperature compensation sensor on

the lower corner of the inside surface of double-pane window glass on north- or

northeast-facing window.

WindowDoorway

Window

Point of vapor absorption

Vapor absorption has taken place

Airﬂow switch or differential pressure switch (sail type

recommended for VAV applications)

High limit humidistat or high limit transmitter (set at 90%

RH maximum) for VAV applications

Damper control

DC-1084

Other factors affecting humidity control

Humidity control involves more than the

controller’s ability to control the system. Other

factors that play an important role in overall

system control are:

Size of humidification system relative to load

Overall system dynamics associated with

moisture migration time lags

t Accuracy of humidistats and humidity

transmitters and their location

t Dry bulb temperature accuracy in space or

duct

t Velocities and airflow patterns in ducts and

space environments

t Electrical noise or interference

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%JTQFSTJPO

4FMFDUJOHUIFEJTQFSTJPOBTTFNCMZMPDBUJPO

Installation

High-efficiency Tube option

Dispersion assemblies with the High-

efficiency Tube option are designed to

produce significantly less dispersion-

generated condensate and airstream heat

gain, which reduces wasted energy by up to

85%. These improvements are accomplished

by reducing the thermal conductivity of the

tubes with 1/8" of polyvinylidene fluoride

(PVDF) insulating material on the outside of

the tubes. These assemblies require careful

unpacking, installation, and handling. If

your dispersion assembly has the High-

efficiency Tube option, be sure to read this

section carefully.

Figure 15-1:

Ultra-sorb with the High-efficiency

Tube option

DRI-STEEM humidifiers operate with several types of dispersion

assemblies for open spaces and for ducts and air handling units.

Dispersion assemblies in ducts and air handling units must be

positioned where the water vapor being discharged is carried off

with the airstream and is absorbed before it can cause condensation

or dripping.

t 'PSFBDIEJTQFSTJPOEFWJDF%3*45&&.EPDVNFOUTEJTUBODFT

required for non-wetting to occur. For more information about

absorption non-wetting distances, see the non-wetting tables in

this humidifier's product catalog, available for viewing, printing

or ordering at www.dristeem.com.

t *OHFOFSBMUIFEJTQFSTJPOBTTFNCMZJTCFTUQMBDFEXIFSFUIF

air can absorb the moisture being added without causing

condensation at or after the unit. This normally will be after the

heating coil or where the air temperature is highest.

t 1MBDFUIFEJTQFSTJPOBTTFNCMZTVDIUIBUabsorption will occur

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

can remove the visible moisture and become waterlogged;

– before coming in contact with any metal surface;

– before fire or smoke detection devices;

– before a split in the duct; otherwise, the dispersion assembly

can direct more moisture into one duct than the other.

t 8IFOESBJOJOHEJTQFSTJPODPOEFOTBUFUPBOPQFOESBJOQSPWJEF

BNNBJSHBQCFUXFFOUIFDPOEFOTBUFESBJOQJQJOH

and the drain. Locate the gap only in spaces with adequate

temperature and air movement to absorb flash steam; otherwise,

condensation may form on nearby surfaces.

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Installation

Table 16-1:

Maximum steam carrying capacity and length of interconnecting vapor hose, tubing and pipe*

Vapor hose Copper or stainless steel tubing and Schedule 40 steel pipe

Hose I.D. Maximum capacity Maximum length** Tube or pipe size*** Maximum capacity

Maximum

developed length

†

DN40 68 kg/h 3 m DN40 68 kg/h 6.1 m

DN50 113 kg/h 3 m DN50 100 kg/h 9.2 m

* Based on total maximum pressure drop in hose, tubing or piping of 1250 Pa

** Maximum recommended length for vapor hose is 3 m. Longer distances can cause kinking or low spots.

*** To minimize loss of capacity and efﬁciency, insulate tubing and piping.

† Developed length equals measured length plus 50% of measured length, to account for pipe ﬁttings.

%JTQFSTJPO

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Important:

Reducing the inside diameter of the

interconnecting piping will result in the internal

humidifier system pressure exceeding the

parameters for acceptable performance.

Important:

Failure to follow the recommendations in this

section can result in excessive back pressure on

the humidifier. This will result in unacceptable

humidification system performance such as

leaking gaskets, blown water seals, erratic water

level control, and spitting condensate from the

dispersion tube.

The steam outlet on the humidifier is sized to the output of

the humidifier. DO NOT use vapor hose or interconnecting

tubing/piping with an inside diameter smaller than the humidifier

steam outlet. See note at left.

t 4FFNBYJNVNTUFBNDBSSZJOHDBQBDJUJFTJO5BCMF

t *GUIFIVNJEJGJFSNVTUCFMPDBUFEIJHIFSUIFOUIFEJTQFSTJPO

assembly, use the recommend installation shown in Figure 18-1.

Connecting to humidifier with vapor hose

t 4VQQPSUWBQPSIPTFUPQSFWFOUTBHTPSMPXTQPUTBOEUP

maintain a minimum pitch of 15% back to the humidifier.

t 6TF%3*45&&.WBQPSIPTF0UIFSNBOVGBDUVSFSTPGWBQPS

hose may use unacceptable release agents or material mixes

that can affect humidifier system performance adversely. Using

hose from alternative manufacturers increases the possibility of

tank foaming and accelerated aging. Foaming causes condensate

discharge at the dispersion assembly.

t %POPUVTFWBQPSIPTFJOPVUEPPSBQQMJDBUJPOT

t %POPUJOTVMBUFWBQPSIPTF*OTVMBUJPODBVTFTBDDFMFSBUFEIFBU

aging, causing the vapor hose to become hard and susceptible to

failure due to cracks.

t 'PSTJOHMFUVCFBQQMJDBUJPOTTFFIPTFLJUTJ[FTJO5BCMF

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DriSteem HUMIDI-TECH Specification

Brand: DriSteem

Model: HUMIDI-TECH

Category: Dehumidifiers

Type: Specification

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DriSteem HUMIDI-TECH Specification

DriSteem HUMIDI-TECH Specification

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