Bosch HPC 400 - Page 22

Service menu
60
50
40
30
20
TCxl°C
~
....-
CD.-
.......
....-
~
........ 1
-
I
+20 +10 0 -10
Oc.1> l JL-
Fig. 10 Setting of simple heating curve
T 10utside temperature
....-
T ;oC
-20 1
TCxFlow temperature of heating circuit x (identical to system flow tem-
perature TO if only one heating circuit is installed)
[1] Underfloor heating system or convector
[2] Radiator
Heat constantly below a certain outside temperature
The heating system can cool down under a certain value due to the
setback mode _ In such cases DIN-EN 12831 requires that heating
surfaces and heat sources are designed for a certain output. This serves
to maintain a comfort heat.
In Heat constantly below you can set at what outside temperature the
setback mode is interrupted (in reference to the adjusted outside
temperature) .
Fig . 11 and 12 show how the frost protection function works, with and
without this parameter activated . Selected settings : Setback type :
Outside temperature threshold; Reduced mode below : 5°C.
TCx;oc
6E L---_~ ----!- - .'-----~-----"I T,J'C
+20 +10 : 0 -10 -20
+5
Fig. 11 Effect at setting Off (default setting)
TCx;oC
Fig . 12 Effectatsetting -15 °C
Key to Fig. 11 and 12:
T 1 Outside temperature
6720 8 15 238-16. 10
6 720 615 238-17. 10
TCxl°C
80
70
60
50
40
30
20
V
+20
I
~~
/~
j
I
@ BOSCH
V
V
6720 81 5 238-14. 10
TCxFlow temperature of heating circuit x (identical to system flow tem-
perature TO if only one heating circuit is installed)
[1] Standby mode
[2] Reduced mode (desired room temperature for setback mode)
[3] Heating mode (desired room temperature for heating mode)
If the outside temperature falls below -15° C, the heating system goes
out of the reduced mode into the heating mode[3] . This allows smaller
heating surfaces to be utilised .
22 HPC400 - 6720821772 (2017/07)