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ENG
“humiSonic ventilation” +0300063EN - rel. 1.0 - 16.02.2016
rH% probe + limit rH%
As in the previous case with limit humidity probe, normally installed
downstream of the droplet separator. The limit humidity probe is usually
set to a high value, e.g. 80% rH, so as to limit the maximum humidity
level in the ducting and in the room. This is especially recommended
in installations where the air fl ow-rate and temperature and humidity
conditions may vary over time, and consequently an additional safety
feature is useful for preventing the humidifi er from over-humidifying the
air and, in the worst case scenario, leading to condensation in the ducting
downstream of the unit.
T probe
The control probe is normally the supply temperature probe in the air
duct.
Max Prod
B1
Prod
100%
Min Prod
St
H P
Fig. 7.e
Key
Prod Production B1 Temperature probe
Max prod Maximum production P Diff erential
Min prod Minimum production H Hysteresis
St Set point
T probe + limit rH%
As in the previous case, yet with limit humidity probe.
7.4 Probe alarms
The settings of the maximum control probe and limit probe limits
determine activation of the alarms. See the alarm table.
Screen index Display description Def Min Max UOM
Fa09 Regulation
Max ambient humidity 80.0 0 100.0 rH%
Min ambient humidity 0.0 0 100.0 rH%
Max limit humidity 100.0 0 100.0 rH%
Min limit humidity 0.0 0 100.0 rH%
Tab. 7.c
7.5 Flow-rate modulation
Atomised water fl ow-rate is modulated between the minimum and
maximum rated capacity.
Screen index Display description Def Min Max UOM
Fa02 Regulation
Max prod 100 10 100 %
Min prod 10 0 100 %
Fa11 Regulation
Mist modulation
mode
Series Series Parallel -
Mist modulation
period
1 1 10 s
Tab. 7.d
7.7.2 7.5.1 Parallel (dipswitch 8 O )
Atomised water fl ow-rate can be modulated as a percentage from 10%
to 100% (Max prod and min prod) of the rated value, with alternating
starts and stops of the transducers over a set period (modulation period,
default 1 second). The fl ow-rate is set based on the Max Prod parameter
(default 100%) and the request from the external signal (for proportional
control).
Transducer
ON
P
OFF
Production = 10 %
t
Transducer
ON
P
OFF
Production = 50 %
t
Transducer
ON
P
OFF
Production = 75 %
t
Fig. 7.f
Key
Transducer Piezoelectric transducers t time
P Modulation period
If the fl ow-rate is 100%, the transducers are always on.
7.7.3 7.5.2 Series (dipswitch 8 On)
Atomised water fl ow-rate can be modulated as a percentage from 10% to
100% of the rated capacity. Each humidifi er is managed with two groups
of transducers (front and rear) and each line is generates 50% of total
production. If the request is set by the external signal (if proportional
control is active) and the Max prod parameter is 100%, both the lines of
transducers will be activated. For lower output, production will be shared
between the two lines of transducers as follows:
• 51% - 99%: one line of transducers is always activated to generate 50%
of required production, while the other modulates as described in
the previous paragraph to generate the remaining percentage. (e.g.
75% request: one line of transducers is always activated, the other
modulates at 50%);
• 10% - 50%: one line of transducers is always off , the other modulates
as described in the previous paragraph to generate the required
production (e.g. 25% request: one line of transducers is always off , the
other modulates at 50%).
The distribution of production between the two lines of transducers is
rotated every hour of operation so as to avoid non-uniform ageing.
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