Stulz ENS 14 A, Technical Manual

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DE / 06-2016 / 1000687 © STULZ GmbH, Hamburg
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Product description STULZ UltraSonic -System for duct humidification ENS 14 A - 18 A-
4.3. Description of unit
Units in the UltraSonic ENS model series 14 A to ENS 18 A are duct humidifiers that work on the princi -
ple of ultrasonic atomization of demineralized drinking water. The principal components of this device are
made from stainless steel or high-grade plastic. The humidifier is fully assembled, internally wired and
leak tested at the factory, where it also undergoes testing under standard operating conditions.
The polished stainless steel housing with removable stainless steel hood contains ultrasonic atomization
modules, a solenoid valve and two float switches.
The compact UltraSonic atomization module is mounted on the floor of the water tank. To increase op
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erational reliability, each transducer has its own electronics, consisting of a rectifier, vibration circuit and
transistor amplifier. The ultrasonic vibrations produced in this way are aimed at the surface of the water,
which is then atomized.
The airflow in the duct distributes the mist produced in the water tank around the room.
To prevent larger droplets in the airflow, the mist is blown out by specially shaped mist guide tubes. The
unit has an air bypass as standard, which allows mechanical calibration of the effective humidifying
output.
Water is supplied by an inlet valve with an integrated stainless steel filter strainer, which is protected
against overheating if it were to run dry. The water level is controlled by hermetically sealed, dust-insensi -
tive magnetic float switches, which additionally monitor unwanted dry running.
To achieve optimum atomization, the water level in the tank must be kept as constant as possible. In ad
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dition to the float switches, the solenoid valve also assists with automated monitoring of the water supply.
If the water in the tank falls below the normal level, the upper float switch switches and the solenoid valve
opens the water supply to the tank. Once the normal water level is reached, the solenoid valve is closed
once more.
Operating the humidifier with an inadequate water level damages the transducers. To prevent this, the
lower float switch switches and operates a relay in the control cabinet, which turns off the power supply
to the unit if the water falls below the safety level:
In addition, a thermostat switches the power off if the temperature in the ultrasonic humidifier rises above
a preset threshold. Varistors are installed to protect the electronics from voltage peaks.
EN / 06-2015 / 1000610 © STULZ GmbH, Hamburg
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Product description    STULZUltraSonic-SystemforDirectRoomHumidificationBNB-
4.3. Description of unit
UnitsintheUltraSonicBNBmodelseries1000AtoBNB8000Aaredirectroomhumidifiersthatwork
on the principle of ultrasonic atomization of demineralized drinking water. The principal components of
this device are made from stainless steel or high-grade plastic. A fan integrated in the housing distributes
thecoldmist,whichisgeneratedinthewatertank,aroundtheroom.Thehumidifierisfullyassembled,
internally wired and leak tested at the factory, where it also undergoes testing under standard operating
conditions.
The polished stainless steel housing with removable stainless steel hood contains ultrasonic atomization
modules,asolenoidvalveandtwofloatswitches.Theairintakefeaturesamaintenance-friendlyinsert
withstainlesssteelguiderails,inwhichawashabledustfilterisinserted.
ThecompactUltraSonicatomizationmoduleismountedonthefloorofthewatertank.Toincrease
operationalreliability,eachoscillatorhasitsownelectronics,consistingofarectifier,vibrationcircuitand
transistoramplifier.Theultrasonicvibrationsproducedinthiswayareaimedatthesurfaceofthewater,
which is then atomized.
Thefandistributesthemistproducedinthewatertankaroundtheroom.Avariableairflowisgenerated,
to ensure that the aerosols dissipate rapidly.
Topreventlargerdropletsintheairflow,themistisblownoutbyspeciallyshapedmistguidepipes,con -
taining a droplet strainer and featuring a soft plastic wiper ring at the outlet. The unit has an air bypass as
standard, which allows mechanical calibration of the effective humidifying output.
Waterissuppliedbyaninletvalvewithanintegratedstainlesssteelfilterstrainer,whichisprotected
against overheating if it were to run dry. The water level is controlled by hermetically sealed, dust-insen-
sitivemagneticfloatswitches,whichadditionallymonitorunwanteddryrunning.
To achieve optimum atomization, the water level in the tank must be kept as constant as possible. In
additiontothefloatswitches,thesolenoidvalvealsoassistswithautomatedmonitoringofthewatersup -
ply.Ifthewaterinthetankfallsbelowthenormallevel,theupperfloatswitchswitchesandthesolenoid
valve opens the water supply to the tank. Once the normal water level is reached, the solenoid valve is
closed once more.
Operatingthehumidifierwithaninadequatewaterleveldamagestheoscillators.Topreventthis,the
lowerfloatswitchswitchesandoperatesarelayinthecontrolcabinet,whichturnsoffthepowersupply
totheunitifthewaterfallsbelowthesafetylevel:
Inaddition,athermostatswitchesthepoweroffifthetemperatureintheultrasonichumidifierrisesabove
a preset threshold. Varistors are installed to protect the electronics from voltage peaks.
Schwimmerschalter Wasserversorgung, BNB
Befindet sich der Magnetring im Schwimmer in der unteren Position bleibt
der Schalter geöffnet.
Befindet sich der Magnetring im Schwimmer in der oberen Position wird der
Schalter geschlossen und somit die Stromversorgung des Magnetventils
und damit die Wasserversorgung hergestellt.
Normal operation for BNB
Water level
ON status
OFF status
Magnetic ring
Switch
The magnetic ring
opens the switch
to cut off the
power supply
OFF Status
Magnetring
Schalter
Der Magnetring hält den
Schalter in geöffneter
Position, so dass das
Magnetventil nicht
einschaltet und die
Wasserversorgung
unterbrochen bleibt.
Float
Fehlfunktion bei Vertauschen
Water supply
Keine Wasserversorgung
Normal operation for ENS