Evolution Solar HDX
26
9
ADDITIONAL FUNCTIONS
The
Evolution Solar HDX
boiler is equipped with an electronic control for efficiently regulating the
automatic functioning of the boiler. It also has the following additional control features:
9.1
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.
9.2
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.
9.3
Telephone relay connection
The
Evolution
boiler is designed to enable a phone relay to be connected for switching the boiler
on and off. This feature allows the boiler to be switched on and off remotely, from any location, by
means of a phone call. The relay is connected to the boiler via terminal strip
J7
(see “Electrical
Connection Diagram”). When the telephone relay contact closes the boiler switches on. When the
contact opens, the boiler switches off and remains in anti-frost protection and pump anti-block
mode.
9.4
Anti-legionella function (optional)
This optional function prevents the bacteria causing legionnaire’s disease from proliferating in the
hot water accumulated in the hot water tank. Every 7 days, the temperature of the water in the hot
water tank is raised to 70 ºC to kill any such bacteria. This function will only be enabled if the boiler
is left switched on.
The boiler is supplied with this function disabled. To enable it, carefully read the "Installation
Instructions" section. We recommend that the operation for enabling this function is carried out by
qualified personnel.
9.5
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
(13)
, 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.
9.6
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
