Logamatic EMS – 6 720 801 387 (2011/05)
39
System settings (Service menu – Settings)
6
From which outside temperature should the reduction be interrupted?
DIN-EN 12831 requires that, for the maintaining of a comfortable heat, all heating surfaces and heat
generators are designed to a defined output, if the heating system cools down below a defined value
due to night reduction.
In the parameter
From which outside temperature should the reduction be interrupted?
it is possible to set an outside temperature threshold (related to the adjusted outside temperature,
(
Æ
page 27).
Fig. 8 shows how the frost protection function works, with and without this parameter activated.
Settings selected: frost protection by
outside temperature
;
frost protection temp.
5 °C.
Fig. 8
Effect of the parameter 'From which outside temperature should the reduction be
interrupted?'. Left: parameter is set to 'Off' (basic setting).
Right: parameter is set to – 15 °C
T
A
Outside temperature
T
V
Flow temperature
1
Shut-down mode
2
Reduced mode (at set nighttime room temperature)
3
Heating mode (at set daytime room temperature)
If the outside temperature falls below – 15 °C, the heating system goes out of reduced mode into
heating mode[3]. This allows smaller heating surfaces to be utilised.
T
A
T
A
T
V
5°C
T
V
5°C
-15°C
2
3
1
2
1
6 720 618 477-07.1RS
