1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 89 of 149
41.1 Anti-Legionella Function
The FS12 parameter allows you to enable the anti-legionella function.
FS12=0
intervals between two anti-legionella cycles; the process will have to be repeated after the
FS13 time since the last anti-legionella production procedure was carried out. The counter continues to
operate, regardless of whether the machine is on or off or in standby; if the power is OFF, the value of the
counter is recorded and then continued when the machine is next started up.
FS12=1
time-bands; Ichill with internal real time clock is required (you need to configure the day of
activation FS18 and the start time FS17).
FS12=2
daily time band (start time FS17 is needed)
To disable the function is necessary to configure FS12=0 and FS13=0 or FS12=1 and FS18=0 or FS12=2
and FS17=0:00.
The function is enabled when the machine is ON. If the request for an anti-legionella cycle is made when the
machine is switched off, the cycle will start immediately when the machine is next switched on and the
priority is given to anti-legionella cycle.
If instead heat regulation is prioritized, the anti-legionella cycle will run when the chiller/heat pump set-point
is reached.
The function must remain active for the minimum time configured with parameter FS19 (activated when the
temperature of the sanitary water reaches the anti-legionella set-point) and can last a maximum of FS29
minutes.
If FS02=0 the Anti-legionella cycle starts when cooling/heating set point is reached.
Compressors and sanitary heaters in Anti-legionella cycle
FS46=0 Compressors and heaters used at the same time in Anti-legionella cycle
When the anti-legionella cycle is active, all the compressors and heating elements configured for the sanitary
water are switched on; once the set-point (FS14) is reached, the compressors are switched off (delayed of
CO04 time) while the heating elements are switched off when the the set-point (FS14) + band (FS20) is
reached.
The anti-legionella cycle is enabled for FS19 time; during this time the machine works to maintain the anti-
legionella set point.
The Anti-legionella cycle lasts maximum FS29 minutes.
It is possible to switch off the compressors if the sanitary water temperature reaches FS50 temperature.
At the end of this procedure, the controller returns to the production of sanitary water or normal
heating/cooling regulation.
If the FS02 parameter (operating priority) gives priority to heating/cooling regulation and the production of
anti-legionella needs to be enabled, then the heat regulation set-point has to be reached beforehand.
The anti-legionella cycle has to end before heating/cooling regulation can start, even if the FS02 parameter
gives the priority to heating/cooling regulation.
FS46=1 First compressors then heaters are used in Anti-legionella cycle
At first the compressors are switched on; when FS50 set point is reached, all the compressors are switched
off and sanitary heaters are switched on to reach the Anti-legionella set point (FS14) + band (FS20).
Once reached, the instrument works to maintain the set point for FS19 time; if water temperature falls down
below FS14 the heaters are switched on and if falls down below FS 50 compressors are switched on.
The Anti-legionella cycle lasts maximum FS29 minutes.
FS46=2 Only heaters are used in Anti-legionella cycle
Only sanitary heaters are used in the Anti-legionella cycle (compressors off); when FS14 + FS20
temperature is reached the heaters are switched off.
Once reached the set point, the instrument works to maintain the set point for FS19 time; the Anti-legionella
cycle lasts maximum FS29 minutes.
