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Every time an Anti-Legionella demand has ended the Anti_Legionella_Active_Counter is incremented to indicate
how many Anti-Legionella actions have been performed. Also the Anti_Legionella_Wait_Time is started to delay
the next Anti-Legionella cycle.
The anti-legionella demand has priority over any DHW demand. However, when the anti-legionella protection is
active and there is no heat or burn demand because the Anti_Legionella_Sensor is already at a high enough tem-
perature DHW demand will be accepted as normal.
Below parameters can be set by the installer.
Parameter
Anti Legionella Day
Anti Legionella Hour
Anti Legionella
Following parameters cannot be set by the installer and are factory set
Parameter
Anti_Legionella_Setpoint (Setpoint for Anti-Legionella
demand)
Anti_Legionella_Burn_Time
Anti_Legionella_Wait_Time Wait time for Anti-Le-
gionella demand.
After a cold boot of the control the Anti-legionella cycle is forced to start after 120 minutes.
When the control is powered the anti-legionella algorithm will be initialized when enabled. The initial wait time
before an anti-legionella cycle is started is initialized as following:
•
Anti-legionella enabled AND Water temperature < Anti_Legionella_Setpoint – 3°C.
•
Anti-legionella wait time initialized to 120 [min].
•
Anti-legionella enabled AND Water temperature >= Anti_Legionella_Setpoint – 3°C.
•
Anti-legionella wait time initialized to 48 [h].
•
Anti-legionella enabled AND Anti_Legionella_At_Boot disabled.
•
Anti-legionella wait time initialized to 168 + 2 [h].
The diagram below shows how the state machine for Anti-Legionella is implemented.
Load waiting period
120 minutes
or
168 hour
86
Parameter nr.
107
108
206
E93.1804.014
Factory Setting.
Sunday
0 hrs.
Enable
Factory Setting.
60ºC (140 ºF)
30 Min.
120 min after cold start, 168 h after first successful Anti-Le-
gionella demand
Burn demand generation
When the anti-legionella control has an active request
a burn demand can be generated. The burn demand
is generated according to the following rules
Start demand
▪ The demand is started when the measured sensor
temperature is below the burner setpoint
Stop demand
▪ The demand is stopped when the measured sensor
temperature is above the burner setpoint + 5°C
Status information
Every time an anti-legionella demand ends the
Anti_Legionella_Active_Counter is incremented to
indicate how many anti-legionella actions have been
performed. This counter can be found in the 'Boiler
History' screen in LabVision PC software.
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