1 HumidifierSystem. 2 KUE…R KUE…2 KUE…3 Humidifier Cylinders.

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Humidifier Humidifier SystemSystem

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KUE…RKUE…2

KUE…3

Humidifier CylindersHumidifier Cylinders

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Humidifier SystemHumidifier System

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The following conditions represent correct water connection:

• Installation of a shut –off tap in the supply water line

• presence of a mechanical filter in the supply water line

• water temperature and pressure within the allowed values

• Drain hose resistant to temperatures of 100 °C

•Minimum slope of the drain hose greater than or equal to 5°

•Electrically non –conductive sleeve

•Presence of a drain pan in the drain hose

IMPORTANT WARNING: when installation is completed, flush the supply hose for around 30 minutes by piping the water directly into the drain without sending it into the humidifier. This will eliminate any scale or processing residues that may block the fill valve or cause

foam when boiling.


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Characteristics of the water


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In the UNIFLAIR products the humidifier bottle for water medium-high conductivity from 300-1250ΩSiemens (available as special option humidifier bottle for low conductivity from 125 to 300

ΩSiemens )

AMICO Steam production 1,5/3 Kg/h Uniflair code UMCV032X1A

LEONARDO EVOLUTION Steam production 5/8 Kg/h Uniflair code UMCV034X1A

LEONARDO MAX Steam production 10/15 Kg/h Uniflair code UMCV040X1A


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It

It + 10% It

It - 5% It

feed evaporating

It = Itarget

Imeasured

The goal of the algorithm is to control the current flowing through the electrodes at the reference value needed to produce the percentage of steam required (by the user parameter set and by room regulation).Due to the evaporation, the water level goes down and, as the measured current depends directly and proportionally on the water quantity inside the bottle, to keep it at the required value (Itarget) it should be necessary to fill continuously the bottle with very small water

quantity.As this is not possible, the measured current is controlled between two values:•Itarget – 5% Itarget•Itarget + 10% Itargetby means of “feed/evaporating” cycles as shown in the following diagram:


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Besides the water level in the bottle, the other determinant factor which affects the outgoing of the measured current, is the water conductivity inside the bottle.In fact, during the feed/evaporating cycles the water conductivity will gradually increase, due to the salt concentration going up in the water inside the bottle.The measure of the water conductivity inside the bottle is carried out indirectly, by counting the time spent to complete an evaporating cycle

Then this time is compared with the reference value (characteristic of each model of bottle) and, if less than this last, a certain quantity of water draining is performed (named dilution draining) then followed by feeding of less conductive water of network.


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The humidifier has then a conductivity meter which is capable to detect the network water conductivity coming inside when feeding. In case of high conductivity detection, the control algorithm inhibits the operation of the humidifier and give an alarm (that is displayed inclusively as high current alarm). This is to avoid that the incoming of high conductivity water can compromise the correct working of the humidifier.


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An other important element is the high level sensor, made up of two short electrodes placed on the roof of the bottle. The high level sensor detects the water high level or the possible presence of foam.


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SETTING OF HUMIDIFIER PARAMETERS

access to the screen which permits the setting of the humidifier parameters, please carry out the following procedure:•Make the unit stop in stand-by (see UG40 user manual);•From the main screen, press Prg key, select Service Menu and confirm by pressing Enter;•Type in the Password Service (see envelope enclosed with the user manual) and confirm by pressing Enter;•select Software Settings and confirm by pressing Enter;Scroll down the screens by pressing the Down key until the screen below appears on the display

Humidifier Set Up Screen.It allows to set the proper size model of humidifier fitted into the unit (Humid.Mod.: KUE... – normally already done in factory) and to reduce the steam capacity related to the nominal production (Max.Steam Prod.%).The last row parameter if set to Y enables the cyclical draining in time (see next screen).N.B.: The shown values are for example only and can be different from values found on field.

Humid.Mod: KUE2-5kg/hV:400/3 Tam100-1turnSteam Cap.: kg/h 3.5Nom.Current: A 6.4Max.Steam Prod. % 070 (30-100%Nom.Cap.)Timed Drains Enable:N


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Timed Drains parameter set screen.This screen is visible if previous Timed drains Enable is set to Y.It allows to set how many starting of the humidifier (Number of Startups:) have to pass before activating the draining valve and how long (Drain Time:) is the draining. This special function allows to reduce the salt concentration inside the humidifier bottle, especially where the control algorithm is not capable to operate correctly due to the very short periods of humidifier continuous working.

HUMIDIFIERTIMED DRAINS SETTING

Timed Drains AfterNumber of Startups: 05Drain Time: 030


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STATUS SCREEN

Humidifier status screen.Mode: it shows the current working mode of the bottle. It can have the following values: “----“ when humidifier is not operating;”Warm-Up” during the initial phase of heating of the water inside the bottle;“Running” when steam production is on;“Foam" if there is foam presence inside the bottle (this condition is automatically controlled by activating the anti-foam algorithm);"Full Bottle" when the bottle needs to be replaced as it is full of scales;"Power Loss" this alarm indicates the absence of power supply to the bottle. Can appear also when the bottle is saturated (full of scale) and needs to be replaced or in case of very low production of steam or very low current absorption."High Current" this alarm is generally due to conductive scales stuck on inside bottle surface, because of the presence of iron particles in the scales; see par. technical notes. Status: it shows the operative status. It can have the following values:“----“when humidifier is not operating;“Boiling” normal condition of steam production;“Drain” when actuating the solenoid valve to drain water from the bottle;“Fill” when actuating the solenoid valve to charge water into the bottle.

Mode: RunningStatus: BoilingSteam Prod. Kg/h 02.3Saturated Cylinder: NoHigh Level: NoConductiv.: S/cm 0243Meas.Current: A 04.2Nom.Current: A 06.4


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Steam Prod. Kg/h: shows the present production in kg/h of steam of the humidifier.Saturated Cylinder: it shows that the bottle is full of calcareous scales: this is to warn that the steam production is reduced due to the bottle situation (in case it is necessary to clean or replace the bottle).High Level: It shows if the filling of water has reached the top limit of the bottle so that the level electrodes (placed in the roof of the bottle) touch the water surface. This conditions inhibits the operation of fill solenoid valve. Conduct.: S/cm it is the value of the conductivity of the humidifier feed water; the value is updated at every filling of water. N.B.: Due to the measuring mode, this is an approximate value.

Mode: RunningStatus: BoilingSteam Prod. Kg/h 02.3Saturated Cylinder: NoHigh Level: NoConductiv.: S/cm 0243Meas.Current: A 04.2Nom.Current: A 06.4


Meas. Current: it shows the TAM measured (present) value of the flowing current in the humidifier electrodes.Nom. Current: is the nominal value of the humidifier current (it depends on humidifier size and on nominal voltage).N.B.: The two values of current, measured and nominal, can differ even considerably without being moreover an index of anomaly, because the steam production is modulated between 20% and the maximum value set, proportionally to the room requirement.

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The values of working hours and of number of starting of the humidifier bottle are necessary to evaluate the status and the durability of the bottle. To have access to these information:•From the main screen, press Prg key, select Settings Menu and confirm by pressing Enter;•Type in the Setting Password (see envelope enclosed with the user manual) and confirm by pressing Enter;•select Hourmeter Settings and confirm by pressing Enter;•Scroll down the screens by pressing the Down key until the screen below appears on the display:

HUMIDIFIERTotal Run Hours 00021Alarm Limit 00000 Reset: N Start.Number: 000097Reset: N


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• Total Run Hours: it is the value of the working hours of the humidifier bottle. • N.B.: The hour counting is proportional to the steam production percentage

(e.g. if the bottle operated for 2 hours at 50% of its nominal capacity, the number of counted hours is 1).

• Alarm Limit: it allows to set a threshold of working hours, that, once reached, activates the signaling “SERVICE” to require the programmed maintenance. Its factory value is 0 (none alarm).

• Reset: Command to clear (zeroing) the working hour counter.• Start.Number: it shows the total number of energizing of the humidifier relay.

This value can help to understand how is working the humidifier: in case of running in continuous mode or long period (preferable) the shown value will be relatively low compared to the total running hours; vice versa in case of short running period (that indicates a capacity too much higher than the room needs) the starting number will be very high, even 10-20 times greater than the running hours.

• Reset: Command to clear (zeroing) the starting number counter.• •

HUMIDIFIERTotal Run Hours 00021Alarm Limit 00000 Reset: N Start.Number: 000097Reset: N

WORKING HOUR AND STARTING COUNTER SCREEN


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R, 20°C [µS/cm]

< 350 350-700 700-1250

< 15 SLOW TO

STEADY-STATE

SOFT OR SOFTENED WATER. PROBABLE: FOAM, ELECTRODE

CORROSION

SOFT OR SOFTENED WATER. HIGH

PROBABILITY OF: FOAM, ELECTRODE CORROSION,

SPARKS

TH [°fH]

15-35 OPTIMAL

FOAM. SOFT OR SOFTENED WATER, ELECTRODE

CORROSION > 35 LIMESCALE LOTS OF LIMESCALE

PHENOMENA RELATED TO TH AND sR, 20°C (QUALITATIVE)


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END OF FILL

EVAPORATION

CURRENT

It = TARGET

START OF FILL

“NORMAL”WATER

IN CYLINDER

EVAPORATION

DRAIN

START OF FILL

CURRENT

It = TARGET

“HIGH CONDUCT.”WATER

IN CYLINDER


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AFS ANTI-FOAMING SYSTEMAFS ANTI-FOAMING SYSTEM

• DETECTED BY FOAM SENSORS

• ELIMINATED BY DRAIN + FILL CYCLES TO

MODIFY WATER COMPOSITION WITH NEW

WATER


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By Humidifier Macroblock is possible to manage humidifier with immersed electrodesBy Humidifier Macroblock is possible to manage humidifier with immersed electrodes

Steam is produced by boiling the water contained in the cylinderSteam is produced by boiling the water contained in the cylinder

By Joule effect, the current heats the water to the boiling pointBy Joule effect, the current heats the water to the boiling point

To avoid this, the algorithm executes a repeated To avoid this, the algorithm executes a repeated water fill / evaporation cycleswater fill / evaporation cycles

During Evaporation cycle there is steam production and the water During Evaporation cycle there is steam production and the water level decreaseslevel decreases

The cylinder needs to be continuously filled for maintain a constant The cylinder needs to be continuously filled for maintain a constant current valuecurrent value


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Set Point

Humidifier power100%

30%

Humidity30%

100%

Proportional band

20%

100%

Proportional band

ON

Dehumidification

10%

OFF

HUMIDITY CONTROL


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FIRST STARTING methodAt the commissioning of the unit IT IS SUGGESTED TO force the humidifier running continuously (by altering the standard set point of humidification) so that to keep it operating until the nominal steam production capacity has been reached. In this way the maximum performances and the longest durability of the bottle are ensured


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It is obvious that, if the humidifier is actuated for a very short period, the algorithm is no more capable to control correctly the salt concentration: when this condition occurs, the solution inside the bottle can become very aggressive so that causing the corrosion of the electrodes, making rapidly the bottle to be unusable. This events is generally good visible due to the reddish colour that appears onto the inside surface of the bottle, that indicates clearly the presence of iron oxide particles in the composition of the limestone scales. Quite ever this phenomena is signalled by high current alarm or even by the tripping of the protection, due to the electrical sparks that the presence of conductive particles can trigger between the electrodes even through the same inside surfaces of the bottle.

The possible solutions are:

1.to increase the continuous running period of the humidifier. This can be done by acting on the total steam production capacity, in case of several units fitted, disabling the humidifier an all units except one (or two in case of stand-by automatic switch-over); or decreasing (in hardware configuration) the size of the humidifier and/or reducing the maximum steam production.2.to activate the cyclical dilution enabling the specific option (Timed Drains Enable:Y) and adjusting, if necessary, the parameters accessible on the specific screen: the proposed values (a draining of 30 sec every 5 starting of the humidifier) should be enough. Good results were reported also setting a short dilution (draining of 5-10sec at maximum) at every starting of the humidifier.


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N.B.: Even if the control algorithm is capable to adequate its behaviour to a wide range of different characteristics of the feeding water, in some cases the bad performances of the humidifier can be improved by using a bottle more suitable to the characteristics of the local water: there are specific bottles for high conductivity water and also specific bottles for low and very low conductivity water.


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Cylinder maintenance

The life of the cylinder depends on a number of factors, including: the complete filling with lime scale and/or the partial or complete corrosion of the electrodes, the correct use and sizing of the humidifier, the output, and the quality of the water, as

well as careful and regular maintenance. Due to the aging of the plastic and the consumption of the electrodes, even an openable steam cylinder has a limited life,

and it is therefore recommended to replace it after


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The steam humidifier has only one component which requires a periodical replacement:the steam production cylinder.This is necessary where the limestone scales that build up inside the cylinder prevent a sufficient flow of current.The frequency of this operation depends on the fill water :the higher the content of salts and impuraties,the more frequent will be the cylinder replacement.

The components to be checked yearly are:

•Fill/drain solenoid valve:remove possible solid scales,without compressed air,and check the proper operation.•Hydraulic circuit/fill tank: remove possible scales along the while distance covered by water from the fill valve to entrance into the cylinder.Afterwards checks that there are no leaks or drips.•Steam pipe/condensation drainage: Check that from its beginning(the humidifier) to its end (distributor) in duct or ambient,there are no narrowing,thus preventing the normal output of the steam/condensation.•Humidity probe: Check the condition of the probes.Do not use compressed air or solvents to clean the probe.

It is possible to wash the parts indicates above, whith a commercially available cleaner (normally ACID ACETIC 20% and water 80%).


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UMAC224X1A cylinder belt locking strap

UMAC223X1A supply tray with conductivity electrodes

UMAC221X1A hum.feed valve kit


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UMAC225X1A drain joint kit

UMAC222X1A hum.drain valve kit

UMAC226X1A-UMAC227X1A internal pipes jit


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UMAC020X1A TAM amperometric transformer

TUPL105X1A rubber tube for hydraulic connection


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UMCV040X1A HUMIDIFIER BOTTLE (for Leonardo max)

Humidifier bottle


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TAM and conductimeter connection


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ALARM SCREENS

High Current Alarm. This alarm appears when the current flowing in the humidifier electrodes exceeds the high limit value.Suggestions/Solutions:•Check the functionality of the drain valve;•Check the wet sealing of the fill valve when no energized;•Then drain some water from the bottle and restart.

Humidifier:High Current


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Power Loss Alarm. When there is the high level signal (bottle full of water) and in the same time the measured current is around 0 (less than 0,5% of nominal current). It can happen also in case of saturated bottle (electrodes fully coated of calcareous scales). Suggestions/Solutions:•Check for tripping of the protection device;•Check the wear status of the bottle;•Check for any leakage of the fill valve;Check the cleaning of the level electrodes

Humidifier:Power Loss

ALARM SCREENS


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Loss of Water Alarm. It appears: 1) During the filling phase:•when the maximum filling time has passed.•In case of anomalous value of current that do not correspond to the normal working of the filling. 2) When in pre-washing cycle:•During filling phase, if the water level does not reach the high level electrodes before the maximum time of feeding has passed.It can be caused also to leakage/malfunction of the drain valve. Suggestions/Solutions:•Check that the feeding pipe from water net to the humidifier and the inside pipes are not obstructed or bended and that there is enough water pressure (0.1÷0.8 MPa, 18 bar);•Check the functionality of the fill valve;•Check for a great head pressure on the steam discharge, so that to inhibit the normal feeding of water inside the bottle;•Check that the steam delivery pipe is not obstructed or that there is not a siphon of condensate;•verificare che il tubo di mandata del vapore non sia strozzato o che non vi siano sacche di deposito di condensa;Check the functionality and the wet sealing of the drain valve

Humidifier:Loss of Water

ALARM SCREENS


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Maintenance Requiring AlarmIf a threshold of running hours was set, when this value is reached this alarm is given.To clear this alarm it is necessary before:•To increase the threshold value (in case of bottle cleaning), or;•To reset the running hour counter (in case of bottle replacing).When resetting the hour counter it is needed to reset also the starting number counter to maintain the coherence of both values.

ALARM SCREENS

HumidifierExceeded 01000

Run Hours


1 HumidifierSystem. 2 KUE…R KUE…2 KUE…3 Humidifier Cylinders.

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Transcript of 1 HumidifierSystem. 2 KUE…R KUE…2 KUE…3 Humidifier Cylinders.