Series Flow-Rate Modulation (Dipswitch 8 On); Automatic Insufficient Feedwater Management; Automatic Control Of Atomised Water Production; Automatic Control Of Leaking Drain Solenoid Valve And Fill Solenoid Valve Flow-Rate - Carel HumiSonic Manual Del Usuario

ENG
Transducer
Flow rate 50%
ON
OFF
Transducer
Flow rate 75%
ON
OFF
Period (b7)
If the flow-rate is 100%, the transducers are always on.
8.4 Series flow-rate modulation (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
transducer lines (front and rear) and each line generates 50% of total
production. If humidity demand from the external signal (when using the
optional card and proportional control) and parameter P0 are both 100%,
both transducer lines will be activated. For lower demand, production
will be split between the two pairs of transducers as follows:
• 51% - 99%: one pair of transducers is always activated to generate 50%
of required production, while the other pair modulates - as described
in the previous paragraph - to generate the remaining percentage
of production. (e.g. 75% demand: one pair of transducers is always
activated, the other modulates at 50%, as shown in Fig. 8.d)
• 10% - 50%: one pair of transducers is always off, the other modulates
- as described in the previous paragraph - to generate the required
percentage of production. (e.g. 25% demand: one pair of transducers is
always off, the other modulates at 50%, as shown in Fig. 8.d)
Distribution of production between the two pairs of transducers is rotated
every hour of operation, to avoid uneven ageing of the transducers.
8.5 Automatic insufficient feedwater
management
The humidifier detects if the feedwater 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 in minutes, depending of the size), humidification
is stopped, 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 unit continues the Retry
procedure for a further time in minutes set for parameter AA. The process
is repeated until the feedwater supply returns, as measured by the sensor.
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 feedwater
supply is available again.
Direct version for room applic. +0300062EE - rel. 1.4 - 24.09.2020
t
Period (b7)
Fig. 8.f
t
Fig. 8.g
8.6 Automatic control of atomised water
production
The humidifier monitors the water level inside the tank during atomised
water production. 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 time set for variable A8 (in minutes, default 30) the water level
does not fall below the low level, atomised water production stops. The
unit waits a few minutes, based on the value set for parameter AA (default
= 10 minutes). The message "Rty" is shown on the display, after which
production resumes. If the situation is repeated, alarm EP is activated,
which shuts the unit down. If after a percentage of A8, set by parameter
Ab (default 70%) the water is above the high level, atomised water
production stops, warning EL is generated and the appliance waits AA
minutes (default 10), during which time the display shows "Rty" (Retry),
before attempting to resume production. The warning signal EL is reset
at the end of a production cycle that is completed correctly.
8.7 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
activated again, 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.
8.8 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 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.
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