Evolution Solar HFD
24
If the solar energy stored in the solar hot water tank water is insufficient to provide the desired
heating level, the
Evolution Solar HFD
boiler is equipped with a microprocessor-controlled
modulating
system for instantaneous hot water production and
progressive regulation
of the hot
water consumption temperature, so that the water is heated to the selected temperature:
-
The modulation allows the boiler power to constantly adapt to the DHW consumption
requirements at all times, without altering the efficiency of the boiler.
Consumption savings
are thus obtained together with improved boiler functioning and lower emissions.
-
Progressive electronic adjustment of the DHW temperature, a system designed by DOMUSA
TEKNIK, enables the DHW consumption temperature to be stabilised at the temperature
selected using the button on the control panel, and a constant hot water temperature with
no variations is obtained regardless of the water flow required and the cold water inlet
temperature at any given time.
This enables optimum hot water comfort and adaptation to
each user’s particular needs.
If you wish, you may totally disable the domestic hot water production function by selecting "
OFF
"
as the instantaneous DHW setpoint temperature. In this case DHW will only be produced by the
boiler’s solar heating system.
11.4
Heating circuit 2 functioning(Optional)
All the models in the
Evolution Solar HFD
range of boilers have the option of controlling a second
heating circuit. This requires the installation of a second circulation pump on the boiler. To correctly
install this pump, carefully follow the instructions given in the “
Installing heating circuit 2
” section
of this manual.
Heating circuit 2 will work with the selected boiler setpoint temperature (see “
Selecting the boiler
setpoint temperature
” ) and the temperature of room thermostat 2 (
TA
2
) (if the boiler has one). The
burner and the heating pump of circuit 2 (
BC
2
) will begin to function until the installation reaches
the selected boiler setpoint temperature (or the temperature on room thermostat 2 (if the unit has
one). When the temperature of the installation drops below the selected boiler temperature, the
burner will start up again, running the heating cycle.
NOTE: When the heating function is disabled, if OFF is selected circuit 2 will also be disabled.
11.5
Functioning with an SRS2/EV Underfloor Heating Kit (Optional)
The
Evolution Solar HFD
boiler may optionally be supplied fitted with an SRS2/EV underfloor
heating kit (fitted to heating circuit 1). This kit basically consists of a motorised 3-way mixing valve
and an underfloor heating installation flow temperature sensor.
The underfloor heating installation is worked by the electronic boiler control. The installation flow
sensor is used to adjust the temperature, selecting the installation flow setpoint temperature using
the boiler setpoint adjustment touch button on the control panel, between OFF, 0 and 45 ºC (see
“
Selecting the Underfloor Heating flow setpoint temperature
”). In this operating mode, the
electronic control sets the boiler setpoint temperature to 75ºC by default, and the installation flow
temperature can be adjusted to the selected setpoint temperature using the mixing valve.
The boiler setpoint temperature can be changed using the MODE touch button to browse to the
“
boiler setpoint temperature
" display option. When the display shows this option, touch the "+ /-"
symbols to select the desired temperature.
If you wish, the SRS2/EV Underfloor Heating circuit function can be totally disabled, by selecting
"
OFF
" as the installation flow setpoint temperature.
NOTE: When the Underfloor Heating circuit function is disabled by selecting OFF as the setpoint
temperature, only circuit 1 will be disabled. Circuit 2 will continue to function.
