Carel UE055 User Manual download pdf (Page 54)

“UEX-PLUS” +030220621 - rel. 1.1 - 30.05.2008

installeruserservice

Independent control with temperature probe

See the paragraph on “Independent control with relative humidity probe”.

The unit of measure in this case is °C (°F).

14.3 Operation with two cylinders (only

UE090...UE130)

The humidi er uses two cylinders to produce steam. The operation of

each cylinder, as well as the management of the corresponding alarms,

is independent. If one cylinder stops steam production (e.g. alarm in

progress), the other continues operation. There are two types of operation

with two cylinders: “parallel sequence” and “series sequence”(installer

menu > regulation type > cylinder sequence).

Parallel sequence (default mode)

In this sequence the two cylinders work so as to produce, in percentage

terms, the same quantity of steam. The steam request is divided into

two equal parts, so that each cylinder produces exactly half the overall

requirement. As the minimum production of each cylinder is 20%, the

minimum production of the humidi er is 20% of the total rated value.

In parallel sequence the wear on the cylinders during the life of the

humidi er is very similar (they are used in the same mode and for the

same time).

Series sequence

In this mode the  rst cylinder works more than the second, in both

percentage and time terms. The total steam request is divided between

the two cylinders in the following way:

if the request is less than 50% in steady operation, only the  rst cylinder •

will be operating,

if the request exceeds 50% the second cylinder will also be activated. •

The minimum production may be as low as 10%.

In series operation the  rst cylinder becomes depleted more quickly than

the second.

Compensation logic

To ensure the delivery of the required quantity of steam, the controller

manages the operation of the two cylinders so that, if one of the two

cannot deliver the amount required, the other is automatically activated

to make up the di erence.

This logic is very important, above all in cases where one of the two

cylinders is stopped by an alarm.

14.4 Supply water conductivity

Conductivity measurement and alarms

The conductivity of the supply water is measured by the conductivity

meter when the  ll solenoid valve is opened.

Two alarm thresholds are available (installer menu > water conductivity

> warning/alarm):

warning threshold (default 1000 uS/cm), signal only without activating •

the alarm relay (automatic reset when the condition is no longer

present);

alarm threshold (default 1250 uS/cm), unit shutdown with activation •

of the alarm relay.

The alarm is activated when the reading exceeds one of the two

thresholds continuously for 60 minutes, or alternatively instantly if the

value read is 3 times higher than the threshold.

To disable the alarm signal, simply set the thresholds above the maximum

value of the reading.

Overriding the conductivity of the supply water

In conditions where the supply water has relatively low conductivity, a

higher conductivity value can be set (installer menu > water conductivity

> override conductivity). In this mode, if during the start-up phase the

water touches the high level sensors (with consequent partial draining),

and the steam production has not yet reached the rated value, the

successive water  ll cycles will last longer than the rated value so as to

reach steady operation faster.

14.5 Automatic draining

The humidi er automatically drains and replaces some of the water

contained in the cylinder, to prevent an excessive concentration of salts

following the evaporation process.

The drain pump is opened for a set time whenever the conductivity

exceeds the maximum limit; this situation is measured indirectly by

evaluating the evaporation speed).

During the automatic draining phase, the electrodes are o , so as to

prevent the drain water from carrying current.

Powered draining

To enable powered draining: installer menu > drain options > contactor

OFF during drain.

Duration and frequency of the drain to dilute cycles

The duration and the frequency of the drain to dilute cycles can be set

according to the characteristics of the supply water (installer menu >

drain options > dilution drain time and frequency). For example, with

highly conductive water, the duration and frequency of the drain to

dilute cycles should be increased. This will avoid excessive concentrations

of salts inside the cylinder.

Drain due to excess foam

With certain types of supply water, foam may form during the production

of steam just above the water. This situation must be resolved, as it may

cause water to be released together with the steam. For this purpose, two

electrodes are  tted on the top of the cylinder. When these electrodes

detect the presence of foam, the humidi er activates a series of repeated

drain cycles. If the situation persists, the complete washing of the cylinder

is activated.

The complete washing of the cylinder can be disabled, so as to guarantee

steam production, even if reduced, in applications where continuity of

service is required (installer menu > drain options > disable complete

emptying for foam).

Drain due to inactivity

In humidi er does not operate for an extended time (it remains on

but does not produce steam), the water in the cylinder is drained

automatically, to avoid stagnation and hygiene risks.

To disable the periodical drain due to inactivity: installer menu > drain

options > drain after inactivity.

To set the inactivity time: installer menu > drain options > inactivity days

(default 3 days).

Draining due to a signi cant reduction in the request for

production

In the event of a signi cant reduction in the request for steam production,

the humidi er, rather than wait for the level of water (and thus the

production) to decrease due to the e ect of the production itself,

performs a drain cycle. The reduction in the request for steam production

is considered signi cant if the current is 33% higher than that relating to

the requested level. This function can be disabled: installer menu > drain

options > drain if steam request drops.

Periodical drain

When using water rich in substances such as humus, lime and impurities,

the e ciency and the operation of the humidi er may be a ected. In

these cases, a periodical drain cycle should be set for the cylinder top

avoid accumulating residues.

To enable the periodical drain: installer menu > drain options > periodic

cylinder  ush

To set the drain interval: installer menu > drain options > time interval

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Carel UE055 User Manual Page 54

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