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If the supply temperature T_Supply is below DHW_Store_Setpoint plus DHW_Tank_Supply_Extra minus
DHW_Tank_Supp_Hyst_Dn the heater is started as well. The power is PID-modulated so T_Supply is regulated
towards the DHW_Store_Setpoint plus DHW_Tank_Supply_Extra.
DHW_Tank_Supply_Extra is default set to 0⁰C because the supply temperature of the water is almost the same as
the tank temperature.
The water heater is stopped when the supply temperature rises above DHW_Store_Setpoint plus
DHW_Tank_Supply_Extra plus DHW_Tank_Supp_Hyst_Up.
The demand for the tank is ended when T_Store rises above DHW_Store_Setpoint plus DHW_Tank_Hyst_Up. The
circulator continues DHW_Pump_Overrun.
Store warm hold function
Because of the presence of the tank sensor (T_Store) the control can detect demand for holding the tank hot. If
T_Store drops below DHW_Store_Setpoint minus DHW_Tank_Hold_Warm the heater starts at minimum power.
DHW_Tank_Hold_Warm is factory set at 3⁰C
If there is a consumption of hot water and the tank sensor drops below DHW_Store_Setpoint minus
DHW_Tank_Hyst_Down the heater will increase its power and the normal control will be active.
Parameters
DHW Mode
DHW Store Setpoint
DHW Tank Hyst. Down
DHW Tank Hyst. Up
DHW Tank Supply Extra
DHW Tank Supp Hyst Dn
DHW Tank Supp Hyst Up
DHW Pump Overrun
Relevant variables
Status Variables
DHW control state
Central Heating controller state
A
-
14.9.2
NTI
LEGIONELLA PROTECTION
Anti-Legionella protection is enabled for DHW mode 1 with an external tank with a sensor to prevent legionella a
special function is implemented in the software.
• The Anti-Legionella protection will be checked on the T_Store sensor.
At least once every 168 hours (7 days) the Anti_Legionella_Sensor must reach a temperature above Anti_Le-
gionella_Setpoint – 3⁰C for a time specified by Anti_Legionella_Burn_Time.
If 7 days have passed and these conditions are not met, the heater is forced to heat-up the system for Anti-Le-
gionella. When the Anti_Legionella_Sensor temperature is below Anti_Legionella_Setpoint the control switches
ON the circulator, when the Anti_Legionella_Sensor temperature is above Anti_Legionella_Setpoint plus 5 °C (plus
9 °F) the control stops the circulator.
The heater setpoint will be Anti_Legionella_Setpoint plus DHW_Tank_Supply_Extra.
If the supply temperature drops below the Heater_Setpoint the heater is started. The heater is PID controlled to-
wards the Heater_Setpoint. When the supply temperature rises above Heater_Setpoint plus DHW_Supp_Hys-
terese_Up the heater is switched OFF.
When the DHW Sensor has been above Anti_Legionella_Setpoint minus 3 °C for Anti_Legionella_Burn_Time the
controller goes into post circulation and ends the Anti-Legionella demand. When the controller has powered up,
the Anti_Legionella_Sensor temperature must reach a temperature of Anti_Legionella_Setpoint (for Anti_Le-
gionella_Burn_Time) within 2 hours, otherwise the heater is forced into Anti-Legionella demand.
Parameter number
Level
35
2: Installer
115
2: Installer
36
2: Installer
37
2: Installer
38
2: Installer
39
2: Installer
40
2: Installer
44
2: Installer
E93.1804.014
Default value
Range
1
0 - 8
60°C (140°F)
0 - 90°C (32 - 194°F)
2°C (3.6°F)
0 - 10°C (0 - 18°F)
3°C (5.4°F)
0 - 10°C (0 - 18°F)
0°C (0°F)
0 - 30°C (0 - 54°F)
2°C (3.6°F)
0 - 20°C (0 - 36°F)
20°C (36°F)
0 - 20°C (0 - 36°F)
20 s
0 – 900 s
Value
0 Idle
1 Request
2 Demand
3 Post circulation
4 Off
85
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