Automatic Insuffi Cient Supply Water Management - Carel Humisonic User Manual

13.4 Series fl ow-rate modulation
(4-transducer ver. only, dipswitch 8 On)
Atomised water fl ow-rate can be modulated as a percentage of rated
production, from 10% to 100%. Each pair of transducers 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%, all four transducers 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. 13.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. 13.d)
Distribution of production between the two pairs of transducers
is rotated every hour of operation, to avoid uneven ageing of the
transducers.
13.5 Automatic insuffi cient supply water
management
The humidifi er detects if the water supply is interrupted (or insuffi cient)
by monitoring the status of the level sensor after opening the fi ll solenoid
valve. If the sensor is not activated within the time set for parameter bA
(default 15 minutes), humidifi 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
fi ll with water again.. If this attempt succeeds, production will resume,
otherwise the appliance waits a further AA minutes. The process is
repeated until the water supply returns, as measured by the sensor.
For the fi 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 humidifi er verifi es that the water supply is
available again.
13.6 Automatic control of atomised water
production
The humidifi 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 fi ll 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 and the appliance waits a set number of minutes (parameter
AA, default 10), during which the display shows "Rty" (Retry), before
attempting to resume 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 appliance waits AA minutes (default
10), during which 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.
13.7 Automatic control of leaking drain
solenoid valve and fi ll solenoid valve
fl ow-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 fi ll solenoid valve fl ow-rate is too low.
In this case, the controller carries out the following operations:
1. At the end of the fi rst cycle that ends after a time less than A9, the
water refi ll time is increased (50% higher than parameter bb) and
the reduced power supply voltage to the drain solenoid valve is
deactivated with the objective of increasing tightness.
2.
At the end of the second cycle that ends after a time less than A9,
the water refi ll time is increased further (100% higher than parameter
bb) and a chattering* cycle is activated on the drain solenoid valve,
performed during the fi rst automatic wash cycle.
3.
At the end of the third cycle that ends after a time less than A9, the
water refi 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 fi nal step, a new production cycle will be activated. If the
problem persists, the controller will restart the procedure from the
fi 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.
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"Ultrasound humidifi er for fan coils" +0300056EN - rel. 1.5 - 24.06.2015
ENG