8.2.4 Legionella prevention function
Parameters
Level
Parameter
Function description
Display & Input value
Remarks
Group Code
Default
min.
Max.
Unit
I
31
40
A nti-legionella function
0=disable
1=enable
0
0
1
-
I
31
41
A nti-legionella operation day of week
0=Mon, 1=Tue, 2=Wed, 3=Thu, 4=Fri, 5=Sat, 6=Sun
0
0
6
-
I
31
42
Start time of the day at which the DHW should be
heated for Anti-legionella
1:00
0:00
23:00
1:00
DHW set point Comfort (50.0°C)
Economy (40.0°C)
DHW tank temperature
Anti legionella set point (65.0°C)
Anti legionella hysteresis
Product by
DHW heater
time
Product by HP unit
(5.0deg)
Max. time (2hours)
Interval
(10 min)
Start time
(1:00)
This function is to sterilize legionella bacteria by heating and maintaining the specific temperature (65°C or higher)
in DHW tank for the specific time (10min).
Regarding the conditions of this function, “States (enable/disable)”, “Operation interval (day of the week)”, and
“Start time (start production to anti legionella set point)” shall be set by parameter.
Note1: DHW Electric heater will be used in order to reach the specific temperature (65°C or higher) in DHW tank.
Therefore, DHW Electric heater shall be available if the anti-legionella function is enabled.
Note2: When the anti-legionella function is enabled (Par3140=1), the Electric heater will also be activated for anti-
legionella function even if DHW production is with only heat pump (Par3102=1)
Note3: The anti-legionella function will be finished after the specific time (2hours) has passed from the start of the
heating DHW tank even though the temperature in the tank has not completed the function (65°C or higher
for 10 min) within the time (2hours).
If this function is not completed in for the specific times repeatedly, the alarm (LC) will be displayed.
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8. Domestic Hot Water Production
Summary of Contents for AEYC-0639U-CH
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