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IQHeat
User manual
27
9.6 Setting up and activating the legionella function
The legionella function is not enabled from the factory.
The set point for legionella must never exceed the temperature for district heating supply. If the legionella set
point is set too close to or above the supply temperature, this may result in a fully open control valve and
thereby large district heat flows.
Always check the supply temperature with the district heating supplier. This is especially important in the
summer.
NOTE: The hot water circuit must be in the Auto operating mode for the legionella function to be enabled.
1. From the Main index select Commissioning.
2. Now select Plant Settings > Domest.hot water.
3. From the HW settings menu select the parameter
to be changed and press OK .
4. After each parameter change, press OK to save
the new settings.
Parameter: Settings range Explanation
Setpoint
legion.
55…100°C
The hot water is
raised to this
temperature to
prevent bacterial
growth
Time legion.
00:00…23:59
Time when the
function is
enabled
Legion hold
time
0…600 m
How long the
function is active
Legion.
interval
•
0-200 days
How often the
function is to be
enabled
0 = "Weekday X
set" controls the
function
1-200= Number
of days between
the activation of
the function
Legion.failure The type of alarm to be sent if the
function fails.
•
Plant.off (A)
•
Plant
stopped.
•
Critical (A)
•
Plant shut
down.
•
Low (B)
•
Affected part
of the plant is
shut down.
•
Warning (C)
•
Only
message.
•
No alarm
•
No message,
no alarm.