Carel humiSonic Compact, Manual

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19
ENG
“Ultrasound for fancoil” +0300059CS - rel. 1.6 - 06.10.2020
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 flow-rate is 100%, the transducers are always on.
9.4 Series flow-rate modulation
(only model 1l/h - dipswitch 8 On)
Atomised water flow-rate can be modulated as a percentage of rated
production, from 10% to 100%. Each humidifier 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 figure)
•
10% - 50%: one transducer is always off, 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
off, the other one modulates at 50%, as shown in figure)
Distribution of production between the two transducers is rotated every
hour of operation, to avoid uneven ageing of the transducers.
9.5 Automatic insufficient supply water
management
The humidifier detects if the water supply is interrupted (or insufficient) by
monitoring the status of the level sensor after opening the fill solenoid valve.
If the sensor is not activated within the time set for parameter bA (default
15 minutes), humidification 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 fill 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 first 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
humidifier verifies that the water supply is available again.
9.6 Automatic control of atomised water
production
The humidifier 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 fill solenoid valve
•
Fan malfunction
If after the set time for variable A8 (in minutes, default 30) the water level
does not fall below the low level threshold, atomised water production
stops. The unit waits a number of minutes set in parameter AA (default
10 minutes). The display shows “Rty” (Retry), then the control resumes
the production. If the situation is repeated, alarm EP is activated, which
shuts down the unit. If after a percentage of A8, set by parameter Ab
(default 70%) the water is above the high level threshold, atomised water
production stops, warning EL is generated and the unit waits AA minutes
(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 fill solenoid valve
flow-rate
Parameter A9 sets a minimum production time (default 1 minute); if the
production cycle lasts less than this time, it may mean that the drain
solenoid valve is leaking or that the fill solenoid valve flow-rate is too low.
In this case, the controller carries out the following operations:
1.
At the end of the first cycle that ends after a time less than A9, the
water refill 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 refill time is increased further (100% higher than parameter
bb) and a chattering* cycle is activated on the drain solenoid valve,
performed during the first automatic wash cycle.
3.
At the end of the third cycle that ends after a time less than A9, the
water refill 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 final step, a new production cycle will be activated. If the
problem persists, the controller will restart the procedure from the
first 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 the low level is measured. During operation, if the
the water level has fallen below the minimum as a result of consumption
due to atomisation, water is replenished by opening the fill valve. If
the level does not rise in the minimum time (AC), the transducers are
switched off, while the filling cycle continues until the level has been
replenished or bA minutes have elapsed since the water fill cycle started.
If the level is replenished correctly, the piezoelectric transducers are
immediately restarted.