40
AW HT
GB 05/2009
ANTI-LEGIONELLA FUNCTION
Parameter
number
Description
Anti-Legionella function
The Anti-Legionella function ensures the elimination of the Legionella bacteria that reside in domestic water
vessels; such bacteria typically die when the water temperature is above 70°C.
The Anti-Legionella function must be activated by an authorised technician.
This function is only available if an electric heater is fitted inside the DHW storage cylinder.
1640 = Off
1640 = Periodically. The Anti-Legionella cycle is activated after the time interval (in days) set by parameter
1641.
1640 = Fixed weekday. The Anti-Legionella cycle is activated every week on the same day, selected by para-
meter 1642.
By setting this parameter, heating will be activated to reach the Anti-Legionella set point on the specified day.
1 to 7 days. Time interval between one Anti-Legionella cycle and the next.
Monday to Sunday. Anti-Legionella cycle day
hh:min. Anti-Legionella cycle time of day
Anti-Legionella cycle temperature set point
Minutes. Anti-Legionella cycle duration
DHW circulating pump
Default setting
1640 = off
7
Thursday
02:00
70°C
60 min.
On
1640
1641
1642
1644
1645
1646
1647
Parameters contained on the DOMESTIC HOT WATER operating page
HEAT PUMP OPERATION WITH FIXED SET POINT
Parameter
number
Description
Digital input SA6 allows operation of the heat pump with a fixed outlet set point, defined by parameter 5952.
Closing the contact disables the outside temperature probe and the room unit.
This is used to select the water outlet temperature set point.
Default setting
5950 = Minimum flow
temperature set point
5952=50°C
5950
5952
Parameters contained on the CONFIGURATION operating page
FROST PROTECTION
Frost protection for system water temperature
The frost protection function is always active, even when the heat pump is off.
If the outlet temperature falls below 5 degrees, the compressor and the heating circuit pump are activated, irrespective of the
operating mode.
When the outlet temperature rises back above of 7°C, the controller waits a further 5 minutes and then stops the production of
heat and pumps.
Frost protection for room temperature
The frost protection function is always active, even when the heat pump is off.
If the inside room temperature falls below 8°C (value set for parameter 714), the heat pump is started to prevent freezing in the
pipes inside the home.
Frost protection for outside temperature
The frost protection function is always active, even when the heat pump is off.
The pump is activated according to the outside temperature, as shown in the following graph:
Parameter 6120 = On
-2
TA °C
OFF
0
1
2
3
4
-3
-4
-5
-6
-1
takt
ON
-2
TA °C
OFF
0
1
2
3
4
-3
-4
-5
-6
-1
takt
ON
Outside temperature
Pump
Diagram
...-4 °C
ON continuously
ON
-5....1.5 °C
ON for 10 minutes at 6 hour intervals
(Cycles)
1.5 °C
OFF continuously
OFF
(Engineer level)
(OEM level)
