25
12
ADDITIONAL FUNCTIONS
The
Evolution Solar HFD
boiler is equipped with an electronic control for efficiently regulating the
automatic functioning of the boiler. It also has the following additional control features:
12.1
Pump anti-block function
This function prevents the boiler circulation pumps from seizing up if they have been out of use for
a long period. This system remains enabled while the boiler is plugged into the mains.
12.2
Anti-frost function
This function protects the boiler from freezing up during cold weather. If the boiler temperature
drops to below 6 ºC, the heating circulation pump will start up. If the boiler temperature continues
to drop and reaches 4 ºC, the burner will start up, heating the installation. When this function has
been activated, it will continue working until the boiler reaches 8 ºC. This system remains on
standby while the boiler is plugged into the mains.
12.3
Boiler pressure sensor function
This function prevents boiler failure caused by a low water level or excess pressure in the boiler. The
pressure is detected by a pressure sensor
(9)
, and its value appears on the control panel display (see
“
Digital display
”). If the pressure drops below 0.5 bar, the electronic control blocks boiler
functioning and triggers the “
AP
” alarm on the display. If boiler pressure exceeds 2.5 bar, the "
HI
"
warning will flash on the display to warn of the excess pressure. If this should occur we recommend
calling the nearest
Technical Assistance Service
, and slightly draining the boiler.
12.4
Room thermostat connection
The boiler has two terminal strips,
TA
1
and
TA
2
, for connecting room thermostats or room
chronothermostats (J5 and J6, see "
Electrical Connection Diagram
”). This allows the heating mode
for each circuit installed to be switched off according to the room temperature. To suitably connect
them, first remove the bridge joining the terminals of terminal strip
TA
1
, and to connect
TA
2
, simply
connect the thermostat to the terminal strip.
Installing a room thermostat will optimise the installation’s performance, adapting the heating to
the requirements of your home and obtaining enhanced comfort. Also, if the thermostat allows the
hours of functioning to be programmed (chronothermostat), it can adapt the heating system to the
hours of use of the installation.
