Elsteam VEH Series Installation and operating instructions

VEH SERIES

ELECTRODES STEAM HUMIDIFIER

FOR AIR HANDLING UNIT

INSTALLATION, USE AND MAINTENANCE GUIDE

Rel. 20.2.EN

Control

Unit

Kettle body to be

installed in the AHU

AHU Electrodes Humidifier - VEH 20.2.EN 2

Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007

E-mail: info@elsteam.it - Web: http://www.elsteam.com

TOC

1SAFETY RULES.........................................................................................................................................................3

1.1 GENERAL RULES ......................................................................................................................................................... 3

1.2 CONDITIONS THERMO HYGROMETRIC (INSTALLATION) .............................................................................................. 3

1.3 POWER SUPPLY ........................................................................................................................................................... 3

1.4 WATER CONNECTIONS ................................................................................................................................................ 3

1.5 WASTE DISPOSAL ....................................................................................................................................................... 3

1.6 WARRANTY ................................................................................................................................................................. 4

2MANUFACTURER DATA .........................................................................................................................................4

4GENERAL CHARACTERISTICS OF THE HUMIDIFIER .......................................................................................5

5STRUCTURE OF VEH HUMIDIFIER.......................................................................................................................5

6WORKING PRINCIPLE ............................................................................................................................................6

7CHARACTERISTICS ................................................................................................................................................7

8HUMIDIFIER INSTALLATION ................................................................................................................................8

8.1 WATER CONNECTION .................................................................................................................................................. 8

8.2 DRAINING CONNECTION .............................................................................................................................................. 8

8.3 ELECTRICAL CONNECTION .......................................................................................................................................... 8

8.4 ENABLE CONTACT ....................................................................................................................................................... 9

8.5 DRAINING BLOCK MANUAL CALIBRATION ................................................................................................................... 9

9WORKING PRINCIPLE ......................................................................................................................................... 11

10 MENU AND PARAMETERS ............................................................................................................................. 11

10.1 ON/OFF MODE .......................................................................................................................................................11

10.2 LANGUAGE.................................................................................................................................................................11

10.3 HUMIDITY SELECTION...............................................................................................................................................11

10.4 NOMINAL CURRENT ..................................................................................................................................................11

10.5 DRAIN TIME. .............................................................................................................................................................12

10.6 WATER FILL TIME......................................................................................................................................................12

10.7 PURGE TIME. ............................................................................................................................................................12

10.8 HEATING TIME ..........................................................................................................................................................12

10.9 TA COEFFICIENT. ......................................................................................................................................................12

10.10 LEVEL SENSOR ......................................................................................................................................................12

10.11 PRESSURE THRESHOLD.........................................................................................................................................12

10.12 MINIMUM 0-10V INPUT CALIBRATION..............................................................................................................12

10.13 WATER CHANGE INTERVAL ...................................................................................................................................12

11 ALARMS............................................................................................................................................................. 13

12 CONNECTIONS.................................................................................................................................................. 14

12.1 USED AND AVAILABLE CONNECTIONS IN VEH1112 ................................................................................................15

13 SCHEMATIC DIAGRAM................................................................................................................................... 18

AHU Electrodes Humidifier - VEH 20.2.EN 3

Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007

E-mail: info@elsteam.it - Web: http://www.elsteam.com

Read this manual carefully, observing all the safety measures listed in it for the correct use of the hu-

midifier. Keep the humidifier in good working condition. Look closely at all the tips for the installation and

use of your humidifier before operating it. It 'made absolute obligation for installers to go through the

installation manual of this unit: Elsteam srl declines any responsibility for damages caused to third par-

ties or to the product resulting from the missing or partial application of the rules contained in it.

Keep this manual and all the documentation that came with your humidifier in a safe place for future

reference further.

1Safety Rules

1.1 General Rules

People who are not familiar with this type of equipment or do not have carefully read this manual should

not be allowed to use the humidifier.

Your humidifier is designed to be used with AC 230V 50/60Hz. Do not attempt to use the humidifier with

a different kind of tension. Check that the mains voltage corresponds to the humidifier target value.

The humidifier must always be switched off before any maintenance operation.

All maintenance and repair work must be performed by the manufacturer, its service agent or qualified

personnel.

Do not scotch the output socket steam humidifier and do not insert any object into any opening.

1.2 Conditions thermo hygrometric (installation)

Make sure that the environmental conditions of the place where the installation is carried out are al-

ways compatible with the requirements of the product as required in this manual. Each Elsteam product

cannot be installed in places exposed to weather conditions or frost, unless different terms are explicitly

expressed in documents countersigned.

1.3 Power supply

The Elsteam equipment must be connected to the power supply strictly following the regulations and

specifications stamped on equipment labels.

In particular, it is mandatory that the supply lines are of the correct section and equipped in accordance

with safety switch (RCD) that can protect user.

1.4 Water connections

Elsteam equipment may need to be connected to the water network. In this case it is necessary to strictly

comply with the regulations and make sure that any fault or water leakage resulting from the installation

or by the equipment cannot cause harm to the environment or to third parties. Do not install the unit on

walkways or above dangerous objects or susceptible to damage and always provide proper drainage

systems that can properly evacuate any water leakage.

1.5 Waste disposal

Directive 2002/96/EC of the European Parliament and the national rules impose an obligation not to

dispose of WEEE as unsorted municipal civil, but to set up a special collection of obsolete parts of the

humidifier.

The buyer has the option to return the humidifier into disuse at Elsteam srl in case of purchase of an

equivalent (o superior) humidifier. Elsteam will take care of disposal directly or through its agents.

AHU Electrodes Humidifier - VEH 20.2.EN 4

Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007

E-mail: info@elsteam.it - Web: http://www.elsteam.com

The disposal of electrical or electronic components in an abusive manner and not complying with the

legislation entails sanctions.

1.6 Warranty

ELSTEAM Srl recognizes on its products the legal guarantees in force at the time of sale of the product.

Incorrect use and lack of maintenance entail the automatic forfeiture of any form of guarantee.

2Manufacturer Data

Manufacturer

ELSTEAM Srl

Via ENRICO FERMI 496, 21042 CARONNO PERTUSELLA (VA) - ITALY

Contacts

Tel.: (0039) 029659890

Fax: (0039) 0296457007

Email: infocomm@elsteam.com

Web: www.elsteam.com

AHU Electrodes Humidifier - VEH 20.2.EN 5

Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007

E-mail: info@elsteam.it - Web: http://www.elsteam.com

4General characteristics of the humidifier

The VEH humidifiers series is a class of electrode humidifiers specifically designed for installation inside

air handling units.

Normally in these applications, the humidifier is installed externally to the AHU and the steam is conveyed

through special piping and steel distributors (which allow the mixing of the steam with the air) inside the

AHU.

The standard solution has numerous drawbacks and additional costs:

-The construction of a technical compartment exterior to protect the humidifier

-An antifreeze device which ensures that the water in the humidifier does not freeze in the ab-

sence of a request for production

-The use of expensive and bulky rubber tubes for the conveyance of steam-

-The use of steel distributors within the UTA

-The formation of condensation inside the tubes and distributors with decreased performance

-The need to install the pipes avoiding traps and depressions that would prevent the steam to

flow properly

-The loss of heat to the outside through both tubes, but especially in the humidifier itself exposed

to low temperatures.

The family of VEH humidifiers, as well as the REH (resistors) and SSH (steam heat exchanger) families, is

able to overcome all these problems, greatly simplifying the installation costs and increasing the per-

formance of the product compared to the corresponding humidifiers usually on the market.

5Structure of VEH humidifier

The VEH humidifier is constituted by two parts connected together electrically: the hydraulic part and

the control unit based on a microprocessor board. The hydraulic part is completely inserted into the

AHU, lying on the condensate drain tank immediately downstream of the cooling coil. The control unit

can be placed in the cabinet already aboard the AHU.

The hydraulic boiler is made up of plastic polypropylene “channel” having a section of 33 cm x 16 cm

height, and having a length proportional to the width of the AHU.

Inside the boiler are arranged longitudinally the stainless steel electrodes, connected to the power sup-

ply phases and easily removable

The lid is made of plastic sections with slope, so as to allow any condensation that falls by gravity into

the boiler in order to avoid power losses. Between the plastic sections is obtained a narrow longitudinal

slot which allows the output of the steam produced, that meets the air for the whole length of the AHU

section.

This solution prevents the formation of condensate in the pipes and also prevents any increase in steam

pressure in the boiler due to blockages in the pipes conveying steam.

Picture 1 - Electrodes

AHU Electrodes Humidifier - VEH 20.2.EN 6

Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007

E-mail: info@elsteam.it - Web: http://www.elsteam.com

On one side of the kettle (the easiest to access once installed) you have the body of hydraulic manage-

ment of the system:

-Maximum water level sensor

-Draining bloc

The draining bloc has been specially designed to empty the tank from water

and limestone pieces without having to block and having to be able to work

without pressure.

It is essentially constituted by a valve having a free passage of 32 mm in di-

ameter, closed by a damper operated by an electric motor and a cam. Grafted

rigidly on the pivot motor is an electronics rotation sensor, which, communi-

cating with the microprocessor control is able to manage the correct opera-

tion of the system and communicate any faults that appear in the display.

6Working Principle

At power the humidifier performs a complete cleaning of tank for cleaning the electrodes. This phase is

followed by a total emptying of water eventually contained inside the kettle, so as to secure an operation

with hygienically perfect water. The humidifier performs a current control in the electrodes to ensure

that the kettle is totally empty. In case presence of current is detected, control system will signal the

"clogged drain" alarm. If the humidistat requires production to the humidifier, the electronics inserts

the power control system and starts to fill the kettle with water to continue with the production phase.

The conductivity of the water varies a lot, not only depending on the hardness of the water itself, but also

on the temperature: cold water is poorly conductive, and its conductivity increases with temperature up

to a maximum of around 95°C before falling back slightly at boiling point. It is a good practice that the

electronics manages current values when the water is close to boiling to compare realistic values of

steam production.

At this point, the humidifier will start filling water at short intervals until reaching a production equal to

the required one.

Following, the control system will keep production at set values with programmed fill or drain of water.

If the production exceeds the required value or the maximum supplied by the setting, the control system

will start to choke the power, taking care, however, that the average value of the output current is al-

ways zero, to avoid excessive corrosion of the electrodes.

At regular intervals, the humidifier makes also small purges, so as to ensure that the salt content in the

water is not too high and thus avoiding an excessive deposit of limestone.

At much longer intervals (default value 4h) the control system will make complete draining of the boiler

to remove limestone deposits.

Picture 2 - Cover with slits for steam outlet

AHU Electrodes Humidifier - VEH 20.2.EN 7

Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007

E-mail: info@elsteam.it - Web: http://www.elsteam.com

7Characteristics

Models

VEH3 VEH5 VEH10 VEH20 VEH30 VEH40 VEH60 VEH80 VEH100

STEAM PRODUCTION

Steam Capacity

[Kg/h] 3 5 10 20 30 40 60 80 100

Max pressure

[mm H2O/

bar]

no limits under normal conditions within the AHU

ELECTRICAL DATA

Power

[kW] 2.5 4 7.5 15 22.5 30 45 60 75

Supply

[Vac, Hz] 230, 50 400, 50

Phases

[n] 1 2 3

Max Current per Phase

[A] 10 10 10 21 32 40 60 80 100

HYDRAULIC DATA

Input Water Quality

Complies with the microbiological requirements defined for drinking water by the reg-

ulations in force in the area of use, possibly partially demineralized

Input Water Conductibility

μS*cm 70…1250

Input Water Hardness

°Fr 5...50

Input Water Pressure

[MPa/bar] 0,02...1/0,2...10

Input Water Connection

M 3/4” G

Drain Water Connection

[mm] 42

GENERAL DATA

Control Unit Dimensions

WxHxD [mm]

400x350x150 450x400x200

Hydraulic Unit Dimen-

sions)

WxH [mm] 320x160

(Depth depending on required capacity and AHU size)

Standard

width 4 elec-

trodes

[mm] 580 580 580 730 930 1130 1330 / /

Standard width 7 elec-

trodes

[mm] / / / 580 730 730 930 1130 1330

Weight

[kg] 12 15 15 18 20 24 26 31 33

IP Hydraulic Unit

IP Control Unit

REGULATION

Control

Internal controller (4-20mA humidity probe), external signal (0-10V, ON-OFF)

AHU Electrodes Humidifier - VEH 20.2.EN 8

Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007

E-mail: info@elsteam.it - Web: http://www.elsteam.com

8Humidifier installation

The hydraulic part is simply placed inside the compartment of humidification of the AHU on the conden-

sate drain pan immediately downstream of the cold battery, with the control group placed on the sides

of the AHU where inspection is easier.

If the AHU is subjected to shock and transport, secure it with screws.

During the humidifier installation carefully follows these points:

•The opening and the closing of the power electronic control box takes place through 4 screws

•Since water is discharged at a temperature of 100 ° C, it is necessary to connect the drain with

a plastic tube of greater length possible (at least 1 meter)

•The model listed above are only for operation in OEM application within AHU

•As above said the humidifier of these families cannot be installed in direct contact with people

and objects

8.1 Water connection

The humidifier is connected to the water through a rubber pipe

that can withstand pressure surges, already included in the hu-

midifier, so as to allow a rapid disassembly for inspection and

cleaning of the filter on the solenoid. Connection type is ¾ inch

female

The supply water must not be demineralized water (not having

conductivity, the humidifier does not produce), preferably un-

sweetened, because generally softened water is corrosive for

the electrodes (even if made of stainless steel). Normal water

can be used to feed the humidifier. If the hardness exceeds 30

French degrees, you can provide a partial softening. However,

it can also be used without softening, providing some supplementary maintenance.

Input pressure must be between 2 and 10 bars.

8.2 Draining connection

If it is allowed, it is sufficient for letting the drain in the condensate drain pan of UTA who will then evac-

uated through its draining connection. In this case you have to connect a 90° bend to the draining block.

This connection assures us that the downloaded limestone cannot block the draining outlet

If you are asked to separate the two drain systems, connect the 40 mm humidifier drain pipe with a

sewer drain trap having at least the same cross section.

8.3 Electrical connection

You need to connect the control unit to the power supply making sure that the cables sections comply

with the regulations and that a circuit breaker is installed upstream.

You do not need the neutral and ground lines.

All operations related to electrical installation MUST be carried out

by qualified

personnel (eg electrician or staff with appropriate training). The customer is

responsible for the use of qualified personnel.

IF THE HUMIDIFIER IS PLACED IN AN ENVIRONMENT WITH STRONG INTAKE

THE 90°

BEND MUST BE DIRECTED IN THE AIRFLOW DIRECTION (otherwise the joined contri-

bution of the aspiration of the air flow on the water and the pressure

of the air

onto the draining will prevent a correct draining of kettle).

AHU Electrodes Humidifier - VEH 20.2.EN 9

Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007

E-mail: info@elsteam.it - Web: http://www.elsteam.com

Before starting ensure the following conditions:

◊The size of the power cables must be convenient to the maximum current that must pass

through them.

8.4 Enable Contact

This connection should be made only for humidifiers placed in centralized and ducted ventilation sys-

tems. It allows stopping the steam production each time the air ventilation in the channels stops. If pro-

duction is not stopped it would create a steam accumulation in the channels and a subsequent conden-

sation with water leaks.

To obtain this enable, you must bring a connection between the auxiliary contact of the fan contactor

(voltage free contact) to terminals J5-6 and J17-8 the humidifier electronic board.

If you do not use such enable, left the contact shorted (J5-6 and J17-8 terminals) as received from

Elsteam.

8.5 Draining block manual calibration

The drain block is calibrated in the best closed position during the testing phase. In case this position

were to vary with time (you see the high losses of the draining pipe), it should proceed to a new adjust-

ment of the closure of the draining block.

This procedure must be carried out with the full water kettle to allow the search of the optimal closed

position.

Please proceed as following:

1) Switch the humidifier OFF

2) Press and hold SET and OK simultaneously while providing voltage. The word "DISCHARGE SET-

TING" appears on the display.

3) 3) Press the + and - buttons to adjust the position of the drain block until you no longer see leaks

from the drain.

4) Press OK.

Before any maintenance and installation power connection should be dis-

continued and protected against any accidental connection.

Before performing the electrical connections make sure that the voltage

available is equivalent to that of the humidifier.

AHU Electrodes Humidifier - VEH 20.2.EN 10

Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007

E-mail: info@elsteam.it - Web: http://www.elsteam.com

ELSTEAM s.r.l.

HUMIDIFIER VEH1112

(Version 1.2)

Control System Programming

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