TECHNICAL ASSISTANCE SERVICE
39
Example: if the calculated value is 1.3, it lies between the 1 and 1.5 curves. Choose the nearest curve, in this case 1.5.
Adjust the trimmer under the DHW temperature setting knob to select KT.
The following KT values can be set:
standard system: 1,0 - 1,5 - 2,0 - 2,5 - 3,0
under-floor system 0,2 - 0,4 - 0,6 - 0,8.
3,0
100
90
80
70
60
50
40
30
20
20
Flow temperature (°C)
Outdoor temperature (°C)
15
10
5
0
-5
-10 -15 -20
2,5
2,0
1,5
T80
1,0
0,8
0,6
0,4
0,2
T45
TEMPERATURE CONTROL CURVE
T80
maximum set point temperature for standard systems (pos.1 jumper not fitted)
T45
maximum set point temperature for under-floor systems (pos.1 jumper not fitted)
TYPE OF HEAT REQUEST
Boiler connected to a room thermostat, parameter 51 set to 0 – manufacturer’s default setting.
Requests for heat are generated by the room thermostat contacts closing, and terminated by the contacts opening. The
boiler calculates the necessary CH flow temperature automatically, though the user can adjust the boiler settings. The
CENTRAL HEATING temperature selector, however, does not give the user control over the CENTRAL HEATING SET
POINT as such, but only permits variation within a range b5 and -5°C. Changing this value does not directly
change the temperature of the CH flow. Instead, it changes the reference temperature (0=20°C) and modifies the calcu-
lation that determines flow temperature automatically.
90
80
70
60
50
40
30
20
10
30
Flow temperature (°C)
Outdoor temperature (°C)
25 20 15
+5°C
0°C
-5°C
10 5
0 -5 -10 -15 -20
HEATING CURVE CORRECTION
