Figure 11 Controls Terminal
The boiler control inputs are all low voltage
and must no be connected directly to the
mains.
The connection terminal block plug (fig. 18)
is located underneath the boiler see fig 19.
Figure 12 Control Terminal Block
11. Additional
Features
11.1
Laptop Serial Connection
For an extended diagnosis and display of
functions, a PC or laptop computer can be
connected to connector (3) (Fig. 13). The
required connecting cable and software is
available from eco hometec as an option.
11.2
8.1.5 Frost protection
If the temperature detected by the supply
sensor falls below 8 °C, the pump will be
switched on and will circulate water through
the central heating circuit. If the temperature
detected by the supply sensor falls below
3 °C, the burner will be ignited. As soon as
the return temperature reaches 15 °C, the
burner will be switched off. The pump will
continue to run for the pre-set overrun time.
It is also possible to set the pump to run
continuously.
11.3
Weather compensation
This function is only available if the optional
external sensor is connected. The external
temperature control determines the
optimum set value of the central heating
temperature in relation to the prevailing
external temperature.
2
3
5
4
1
EC 25 Compact Technical Manual page
21