E93.1803.901 HW
88
After a cold boot of the control the Anti-legionella cycle is forced to start after 120 minutes.
When the Anti-legionella request is active the measured sensor temperature must stay above
Anti_Legionella_Setpoint
–
3°C
for at
least
Anti_Legionella_Burn_Time
. When the measured sensor temperature drops below this level the
Anti_Legionella_Burn_Time
is
reloaded
The diagram below shows how the state machine for Anti-Legionella is implemented.
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 se 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 b
een performed. This counter can be found in the ‘Boiler History’ screen in
LabVision PC software.
Load waiting period
120 minutes
or
168 hour
Содержание CB 105 HW
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