Stulz ULTRASONIC Manuel utilisateur
AIRCONDITIONING
ULTRASONIC / ENS
TECHNICAL MANUAL - ENS
INDEX 71.1-2
Edition 2.97
Copyright STULZ GmbH 02/1997
Û
ULTRASONIC
2Copyright STULZ GmbH 02/1997
TABLE OF CONTENTS
Page
1. Operation 4
2. Technical Data ENS Series 5
2.1 Humidifier Path 6
2.2 Dimensioned Drawings 7
2.3 Description 9
3. Capacity Calculation for Ultrasonic Humidifiers11
3.1 Questionnaire Ultrasonic Humidifiers 18
4. Control System 20
4.1 Set-up of ON/OFF Control 21
4.2 Set-up of Proportional Control 26
4.3 Function of Proportional Adapter 31
4.4 Connecting Lines between the Humidifiers 34
and the Control System
4.5 Electrotechnical Information ENS 1200-9600 36
ON-OFF
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TABLE OF CONTENTS
Page
4.6 Electrotechnical Information ENS 14-18 37
5. Assembly, Start-up and Limitations 38
5.1 Assembly ENS Series 39
5.2 Installation Examples for Humidifiers ENS 60
5.3 Start-up of Humidifiers ENS 63
5.4 Precautions during Operation 65
6. Accessories 67
6.1 Data Sheet SafetyTransformers 67
6.2 Information Regarding the Conductimeter 68
7. CE - EMC law
7.1 Information about the EMC law 70
according to CE-guidelines
ULTRASONIC
4Copyright STULZ GmbH 02/1997
1. Operation
STULZ Ultrasonic humidifiers operate on the principle of ultrasonic nebuliza-
tion. A 48 V a.c. voltage is rectified on an oscillator circuit and transferred into
a high frequency signal of 1.65 MHz. This signal is transmitted to an oscillator
(transducer) installed in the water bath, which then transfers this signal into
high frequency automatic vibrations. The built-in oscillators are so-called
thickness oscillators which in accordance with the signal of 1.65 MHz applied
change their thickness 1.65 million times per second.
Thesurfaceofthetransduceroscilla-
tes at such a high speed that the
water cannot follow because of its
inertia of masses; therefore, imme-
diately after the unit has been swit-
ched on, a water column is genera-
ted above the oscillators. During the
negative amplitude of the oscillator,
an instantaneous vacuum is produ-
ced because of the fact that the
watercannotfollowthefasteroscilla-
tor movements. Cavitation produ-
ces bubbles, which are "catapulted"
to the edge of the water column du-
ring the course of the positive ampli-
tude and which collide there with
great force. During this procedure,
finest water particles are being ato-
mized at the edge of the water co-
lumn. Due to the focussing of the
sound waves, cross waves are pro-
duced directly underneath the water
surface, in the centers of which
smallest water droplets are separa-
ted and generate a mist, which is
immediately absorbed from the air
stream.
OPERATION
ULTRASONIC
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Copyright STULZ GmbH 02/1997
TECHNICAL DATA ENSTYPE
2. Technical Data ENS Type
The Ultrasonic humidifier type ENS operates on the principle of utrasonic
nebulization.Thehumidifierisintendedforinstalledincompactair-conditioning
units, box-type units and intake air ducts.
Itcontainsthenebulizationmoduleswithwatersupplyvalve/solenoidvalveand
float switch.
Type ENS ENS ENS ENS ENS ENS ENS ENS ENS ENS
1200 2400 3600 4800 6000 7200 8400 9600 14 18
Output 1.2 2.4 3.6 4.8 6.0 7.2 8.4 9.6 14 18
(l/h) 2x7.0 2x9.0
No. of 2 4 6 8 10 12 14 16 24 30
Oscillators
Trans- Primary: 110V / 208V / 230V / 400V / 460V ±15 V
former 50/60 Hz
Secondary: 12V / 24V / 36V / 42V / 48V / 52V
No. Power 65 125 185 240 310 375 435 495 750 960
(W)
Transf.Out. 160 160 320 320 320 500 500 500 1300 1300
(VA)
Weight 1.5 2.2 2.9 3.6 4.3 5.1 5.8 6.5 11 13
(kg)
Dimension 220 340 460 580 700 820 940 1060 785 950
L (mm)
Dimension 120 240 360 480 600 720 360 480 730 895
P, P1, P2 (480) (480)
(mm)
Subject to technical modifications./* output at: water level 40mm, air temp. 26°C, water temp.
26°C, voltage 48V.
Working condition: Air temperature 8°C bis 40°C, relative humidity below
90%
Water supply: The feed water supplied into the humidifier must be
<20µS/cm. Water pressure should be between 0.2 bar
and 6 bar. The water temperature should be between
5°C abd 40°C.
ULTRASONIC
6Copyright STULZ GmbH 02/1997
Humidifier Path
The length of the humidifier path is dependent on different factors.
- even distribution of the mist in the airflow
- air temperature
- relative air humidity
- air speed
Thefollowingdiagramforthedetermationofthehumidifierpathcontainsstandard
values dependent on the most important parameters. (Air temperature 18°C to
24°C). The tolerance is approx. ± 0.5 m.
If noplaceisavailableforthehumidifierpath,useofamistcollectorispossible.The
smaller the distance to the mist collector, the larger the loss effect of the humidifier
and the more water is drained off into the pan, which has to be drained off for
hygienic reasons. Another possibility to reduce the humidifier path is the employ-
ment of a proportional control. With this control, the output of the humidifiers is
reduced dependent on the requirements in more than 90% of the operating time
and therefore reduces the humidifier path, saves the oscillators and maintains an
even distribution of the mist even in operation under partial load.
TECHNICAL DATA ENS SERIES
2.1
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TECHNICAL DATA ENS SERIES
Dimensioned Drawings
Unit Assembly ENS 1200-9600
Dimensions L, P, P1, P2 refer to page 5 "Dimensions"
Legend
1 Water supply module
2 Nebulizing module
3 Mist collector
4 Electric supply*
5 Cable socket
6 Water supply line*
7 Safety overflow
8 Water drain
9 Installation base
*
to be supplied by customers
2.2
ULTRASONIC
8Copyright STULZ GmbH 02/1997
Unit assembly ENS 14-18
TECHNICAL DATA ENS SERIES
Dimensions L, P refer to page 5 "Dimensions"
Legend:
1 Water supply module l 7 Water supply line*
2 Mist collector 8 Safety overflow
3 Metal plug 9 Water drain
4 Cable 10 Installation base
5 Metal plug 11 Check valve*
6 Cable *
to be supplied by customers
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Copyright STULZ GmbH 02/1997
TECHNICAL DATA ENS SERIES
2.3
Unit Description
Safety Appliances
Automatic feed water control with solenoid valve and float switch. Preventive
protectionagainstdry-running;if waterlevelfallsbelowaset level,floatswitch
and relay are automatically activated in order to cut off power supply. The
thermostatwill automaticallycutoffpower supplyif temperatureinthehumidi-
fier gets higher than the setpoint.
Forfurtherprotection,fuses and varistorshave been installed to protectthe
electronic parts.
Description of main components
1. Humidifier ENS 1200-9600
Thehumidifierconsistsofwatertanksthatarelinkedtogetherandusedforthe
nebulization and control of the water supply. The nebulization module is
equipped with oscillation converters. The tank, built-in for control of water
supply, is equipped with all necessary devices for supply and control, such as
relay, solenoid valve and float switch.
2. Humidifier ENS 14-18
Utrasonic nebulization modules, the solenoid valve and the float switches are
installed in a stainless steel casing.
3. Nebulization Module
Oscillators and amplifying circuits are installed at the bottom of each of these
compact units. 48 Volt a.c. are being applied to an oscillating circuit and are
amplified to high frequency performance, so that the oscillator (transducer) is
set to automatic vibrations. The generated ultrasonic waves are then directed
to the water surface and, as a result, the water is being atomized.
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10 Copyright STULZ GmbH 02/1997
TECHNICAL DATA ENS SERIES
4. Water Supply Solenoid Valve and Float Switch
In order to achieve optimum nebulization of the water, the water level in the
tanks has to be kept as constant as possible. To meet these requirements, a
solenoid valve and a float switch are used for automatic water supply. If the
waterlevel inthetankfallsbelowthestandardlevel,thefloatswitchwillturnto
ON and the solenoid valve opens to fill the tank with water.
As soon as the standard water level has been reached, the float switch will
turn to OFF again and the solenoid valve is closed.
5. Relay (externally installed in control box) and Float Switch (dry-
running Protection)
Should the humidifier be operated with a water levelin the tank being too low,
the oscillator will be damaged. To avoid any dry-running, a float switch is
inserted. If the water level falls below the safety level - for any reason
whatsoever,thefloatswitchturnstoOFF, activatestheexternalrelay whichis
installed on the supply board and cuts off the electric power supply to the
oscillators.
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