Eco-King HWB-299, Installation And Service Manual

Page: 79 / 124

E93.1801EN171 HWB installation manual 79
13.8.3 A
NTI
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LEGIONELLA PROTECTION
Anti-Legionella protection is enabled for DHW modes with an external tank with a sensor (DHW Mode 1).
To prevent legionella a special function is implemented in the software.
• When DHW Mode 1 is selected the Anti-Legionella protection will be checked on the T_DHW_Out sensor.
At least once every 168 hours (7 days) the Anti_Legionella_Sensor must reach a temperature above Anti_Le-
gionella_Setpoint for a time specified by Anti_Legionella_Burn_Time.
If 7 days have passed and these conditions are not met, the boiler is forced to heat-up the system for Anti-Legionella.
When the Anti_Legionella_Sensor temperature is below Anti_Legionella_Setpoint the control switches ON the cir-
culators, when the Anti_Legionella_Sensor temperature is above Anti_Legionella_Setpoint plus 9 °F (plus 5 °C) the
control stops the circulators.
When DHW Mode 1 is selected the boiler setpoint will be at
Anti_Legionella_Setpoint plus DHW_Store_Supply_Extra.
If the supply temperature drops below the Boiler_Setpoint the boiler is started as well. The boiler is PID controlled
towards the Boiler_Setpoint. When the supply temperature rises above
Boiler_Setpoint plus DHW_Supp_Hysterese_Up the boiler is switched OFF.
When the Anti_Legionella_Sensor is above Anti_Legionella_Setpoint minus 5.4 °F (minus 3 °C) for Anti_Le-
gionella_Burn_Time the controller goes into post circulation and ends the Anti-Legionella demand. When the con-
troller has powered up, the Anti_Legionella_Sensor temperature must reach a temperature of Anti_Legionella_Set-
point (for Anti_Legionella_Burn_Time) within 2 hours, otherwise the boiler is forced into Anti-Legionella demand.
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 and CH demand. However, when the anti-legionella protec-
tion is active and there is no heat or burn demand because the Anti_Legionella_Sensor is already at a high enough
temperature CH/DHW demand will be accepted as normal.
Below parameters can be set by the installer.
Parameter for installer (DHW mode 1 only)
Parameter
Factory Setting.
(107) Anti Legionella Day
Sunday
(108) Anti Legionella Hour
0 hrs
Following parameters cannot be set by the installer and are factory set
Parameter
Factory Setting.
Anti_Legionella_Setpoint
Setpoint for Anti-Legionella demand
140 ºF (60 ºC)
Anti_Legionella_Burn_Time 30 Min.
Anti_Legionella_Wait_Time
Wait time for Anti-Legionella demand.
120 min after cold start, 168 h after first successful Anti-Legionella de-
mand