Carel humiSonic Compact - Automatic Control of Atomised Water Production; Automatic Control of Leaking Drain Solenoid Valve and Fill; Automatic Insufficient Supply Water Management; Automatic Protection of the Piezoelectric Transducers

19
ENG
“Ultrasound for fancoil” +0300059IE - rel. 1.7 - 24.10.2022
ON
t
OFF
Period (b7)
Flow rate 10%
Transducer
Fig. 9.e
ON
t
OFF
Period (b7)
Flow rate 50%
Transducer
Fig. 9.f
ON
t
OFF
Period (b7)
Transducer
Flow rate 75%
Fig. 9.g
If the ow-rate is 100%, the transducers are always on.
9.4 Series ow-rate modulation
(only model 1l/h - dipswitch 8 On)
Atomised water ow-rate can be modulated as a percentage of rated
production, from 10% to 100%. Each humidier is managed with
two piezoelectric transducers and each transducer generates 50% of
total production. If the demand from the external signal or calculated
according to the probe readings is 100% and parameter P0 is at 100%,
both the piezoelectric transducers will be activated. For lower demand,
production will be split between the two pairs of transducers as follows:
• 51% - 99%: one transducer is always activated to generate 50% of
required production, while the other one modulates - as described
in the previous paragraph - to generate the remaining percentage of
production (e.g. 75% demand: one transducer is always activated, the
other modulates at 50%, as shown in gure)
• 10% - 50%: one transducer is always o, the other one modulates -
as described in the previous paragraph - to generate the required
percentage of production. (e.g. 25% demand: one transducer is always
o, the other one modulates at 50%, as shown in gure)
Distribution of production between the two transducers is rotated every
hour of operation, to avoid uneven ageing of the transducers.
9.5 Automatic insucient supply water
management
The humidier detects if the water supply is interrupted (or insucient) by
monitoring the status of the level sensor after opening the ll solenoid valve.
If the sensor is not activated within the time set for parameter bA (default
15 minutes), humidication is interrupted, the drain is activated and the
appliance waits a set number of minutes (parameter AA, default 10), during
which the display shows “Rty” (Retry), before attempting to ll with water
again. If this attempt succeeds, production will resume, otherwise the
appliance waits a further time in minutes set in parameter AA. The process
is repeated until the water sensor detectes water. For the rst two attempts,
no alarm is generated, while if on the third attempt the procedure is not
successful, alarm EF is generated, which is reset automatically when the
humidier veries that the water supply is available again.
9.6 Automatic control of atomised water
production
The humidier monitors the water level inside the tank during production
of atomised water. If the level does not fall, it means one of the following
faults may have occurred:
• Malfunction of the piezoelectric transducers
• Leaky ll solenoid valve
• Fan malfunction
If after the time set by variable A8 (in minutes, default 30) the water has
not dropped below the low level, production is stopped with an EP
blocking alarm and complete emptying of the tank is started. If instead,
after a percentage of time of A8, set by parameter Ab (default 70%) the
water is above the high level threshold, atomised water production
stops, warning EL, it discharges for the time set by parameter bC and
then a time equal to AA minutes is waited (default 10), during which
the display shows “Rty” (Retry), then the control resumes the production.
The warning signal EL is reset at the end of a production cycle that is
completed correctly.
9.7 Automatic control of leaking drain
solenoid valve and ll solenoid valve
ow-rate
Parameter A9 sets a minimum production time (default 0 minutes); if
the production cycle lasts less than this time, it may mean that the drain
solenoid valve is leaking or that the ll solenoid valve ow-rate is too low.
In this case, the controller carries out the following operations:
1. At the end of the rst cycle that ends after a time less than A9, the
water rell time is increased (50% higher than parameter bb).
2. At the end of the second cycle that ends after a time less than A9,
the water rell time is increased further (100% higher than parameter
bb) and a chattering* cycle is activated on the drain solenoid valve,
performed during the rst automatic wash cycle.
3. At the end of the third cycle that ends after a time less than A9, the
water rell time is increased further (150% higher than parameter
bb) and a washing cycle is performed, during which chattering* is
applied, as enabled in the previous step. Warning Ed is also generated.
4. After the nal step, a new production cycle will be activated. If the
problem persists, the controller will restart the procedure from the
rst step, until completing a cycle in the expected time. In this case,
any warnings will be reset.
*Chattering: a sequence in which the drain solenoid valve is opened/
closed in rapid succession, with the aim of removing any residues (scale,
dust, etc.) that prevent it from closing correctly.
9.8 Automatic protection of the
piezoelectric transducers
The piezoelectric transducers will, by nature, be rapidly damaged
and eventually break if operated without water. To prevent this from
happening, the control board makes sure, via the level sensor, that even
in the event of anomalies the transducers are never activated when no
water is present. When starting with the tank empty, the transducers are
only activated when water is above the low level. During operation, if
the water drops below the low levelas a result of consumption due to
atomisation, water is replenished by opening the ll valve. If the high level
does not rise in the minimum time (AC), the transducers are switched
o, while the lling cycle continues until the level has been replenished
or bA minutes have elapsed since the water ll cycle started. If the level
is replenished correctly, the piezoelectric transducers are immediately
restarted.