Installation manual
44 RIVA PLUS COMBI MANUAL
15. Commissioning Cont.
When the outdoor reset temperature probe is
installed, this parameter must be set based
on the heating system efciency to optimise
the supply temperature (Figure 15.9).
Ex. To achieve a supply temperature to the
heating system of 173°F with an outdoor tem-
perature of 25°F, K must be set at 1.5 (dashed
line in Figure 15.9).
• Position the handle C indicated in Figure
15.10.
Figure 15.10
C
K1
K1.5
K1.9
K2.4
K3
15.7 Setting the outdoor reset K coefcient:
The boiler is set with a K coefcient equal to
zero for boiler operation without a connected
probe.
Figure 15.9
External temperature °F
C.h. flow temperature °F
10
4
11
3
12
2
13
1
14
0
14
9
15
8
16
7
17
6
18
5
68 61 53.5 46.5 39 32 25 17.5 10.5 -3 -4 -1
1
K=1.5
K=2.4
K=1.9
K=1
K=3
The K coefcient is a parameter that raises
or lowers boiler supply temperature as the
external temperature changes.
15.8 Adjustment of temperature WITH the outdoor reset temperature probe connected:
In case of acting on the knob C Fig. 15.10 to turn off the boiler or to operate it for hot water
only, put the knob in the same position when reactivating the central heating operation.
Your boiler automatically adjusts the temperature of the central heating ow as a function of
the outdoor reset temperature.
The adjustment of the boiler must be carried out by the installer that will evaluate the appropri-
ate central heating water ow temperature depending on the type of heating system.
The knob C Fig. 15.10 must remain on the position given by the installer. This will en-
sure the proper operation of the central heating system.