Carel heaterSteam, User Manual

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35
ENG
“heaterSteam” +0300080EN - rel. 1.0 - 27.04.2016
Preheat with control by external signal
The preheating function, if active, shifts the control diagram by a value
equal to the “off set”. The preheat function modulates the power delivered
to the heaters in relation to the water temperature and the preheating
set point.
P
OFF
ON
100% hy
max
Steam_ P r
P
min
Offset
OFF
OFF
ON
hy
%rH
Y
0%
2 x hy
Vapore
P re-riscaldo
Fig. 7.c
Key
Steam_pr Steam production y External signal
P
max
Max production hy Activation hysteresis
P
min
Min production
7.3.3 F ill cycles in PW M mode after drain to dilute
cycles and high level/foam (Installer menu)
After a drain to dilute cycle or high level/foam, the fi ll valve is opened
to replenish water up to the maximum level of the fl oat. The addition of
fresh water aff ects steam production, as it decreases the average water
temperature inside the cylinder: to reduce the negative impact of fresh
water on steam production, the user can activate PWM mode for the fi ll
cycles after drain to dilute cycles and high level/foam.
PWM mode for fi ll cycles works as follows:
1. the mass of fresh water needed to replenish the water level is divided
into smaller amounts of fresh water;
2. by keeping the partial fi ll cycles as far apart as possible, each small
amount of fresh water has more time to heat up before more fresh
water is fi lled, thus reducing the negative impact of the fresh water
on steam production.
The duration of each fi ll cycle can be defi ned in seconds:
Index Description Parameter
Eb03
Partial fi ll Enable partial fi ll.
Set the partial fi ll cycle time.
Defaults:
partial fi ll: enabled
fi ll time: 5 seconds
Possible settings 1-199 seconds
7.3.4 Total drain due to inactivity (Installer menu)
For reasons of hygiene, it is recommended to empty the cylinder so as
to prevent water from stagnating inside when there is no humidifi cation
request for an extended period. The user can set the automatic total drain
due to inactivity time in hours:
Index Description Parameter
Eb04 Drain due to
inactivity Enable drain due to inactivity;
set the hours of inactivity without production request that
must expire before draining
Defaults:
drain due to inactivity: enabled;
hour threshold: 72 hours
Possible settings: 1-999 hours
Remarks: heaterSteam must remain on in order to empty
the cylinder. The display shows “DRAIN TO DILUTE” during
the drain due to inactivity cycle.
Automatic total drain due to inactivity cycle is enabled by default and
the maximum inactivity time is three days (72 hours): the cylinder will be
automatically emptied when heaterSteam remains on for at least three
days without humidifi cation request.
7.3.5 P eriodical drain (Installer menu)
If the feedwater is turbid or has a high mineral content, the cylinder can
be periodically drained in order to clean and dilute the water as much as
possible. For this operation to be eff ective, it is recommended to carry it
out at least once every two-three days. The user can set the automatic
periodical total drain cycle as follows:
Index Description Parameter
Eb05 Periodical
drain Enable periodical drain;
Set the time between one periodical drain cycle and
the next (in hours);
Defaults:
periodical drain: disabled;
hour threshold: 10 hours
Possible settings: 0-999 hours
Remarks: heaterSteam must remain on in order to emp-
ty the cylinder. The display shows “PERIODICAL DRAIN”
during the periodical drain cycle.
Periodical drain is disabled by default. The periodical drain hour counter
considers the eff ective production time.
7.3.6 Thermal shock to assist detachment of scale
(Installer menu)
Considering the natural trend of scale to build up on the inside surfaces of
the cylinder, the materials used are all as smooth as possible. To limit scale
build up even more, especially on the heaters, the thermal shock function
has been implemented. This function completely empties the cylinder
when production stops (and consequently when the water is still boiling).
At the end of the drain cycle, water is refi lled until reaching the top level.
The thermal shock function is set to be activated a certain number of hours
of eff ective production time between two consecutive cycles. On reaching
the time threshold, the thermal shock function will be activated the next
time production stops, without limits in terms of waiting time.
Note: in the event of non-stop operation 24 hours a day, the thermal
shock function will never be activated and will remain constantly
pending.
Index Description Parameter
Eb06
Thermal
shock Enable thermal shock;
Set the time between one thermal shock cycle and the
next (in hours);
Defaults:
thermal shock: disabled;
interval: 250 hours
Possible settings: 0-1000 hours
Remarks: the notifi cation center will signal when thermal
shock is pending if the time threshold has been exceeded
by production is still in progress. During the function,
the display will show “Thermal shock” in the unit status
graphic area. A notifi cation message will be shown when
there are six hours of production left until thermal shock
is activated; the pending thermal shock can be cancelled
on this screen.