User manual

55
ENG
“UEX-PLUS” +03U220621 - rel. 1.4 - 04.08.2009
installeruserservice
If this mode is activated, if the probe limit is disconnected, (alarm E4) steam
production will continue according to read only the main probe.
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 rst, 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, especially 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 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
If the 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).