DOMUSA TEKNIK EVOLUTION EV 20 HFC, Installation And Operating Instructions Manual

Evolution EV HFC 

20

Conventional heating installation (direct circuit) 

The maximum temperature, an operating curve for heating circuit 1 (see instructions enclosed 

with the E20 remote control) and the desired heating times and room temperatures can all be 

selected on the remote control. The E20 remote control calculates the required boiler 
temperature at each particular time, depending on the temperature inside the home and the 

outside weather conditions, in accordance with the operating curve selected (setting 

HEATSLOPE 1 on the E20), switching the heating on and off in accordance with the heating 

times and the room temperatures programmed. 

Heating installation with an SRFC2/EV underfloor heating kit (mixed circuit) 

If the boiler has an SRFC2/EV underfloor heating kit installed on circuit 1 and the control of this 
kit is activated on the E20 remote control using the HEATSLOPE 2 setting (see instructions 

enclosed with the E20 remote control), the adjustment and control of the underfloor heating 

circuit flow temperature will be performed by the remote control. The E20 will calculate the 

required flow temperature at each particular time, depending on the temperature inside the 

home and the outside weather conditions, in accordance with the operating curve selected (the 
HEATSLOPE 2 setting on the E20 remote control). For mixed underfloor heating circuits, we 

recommend selecting operating curves of less than 0.8. 
The boiler setpoint temperature will be fixed at 75ºC and can be changed using the boiler 

control panel. This setpoint temperature can be changed by using the MODE touch button to 

browse to the “boiler temperature setpoint" display option. When the display shows this option, 
touch the "+ /-" symbols to select the desired temperature. 
The E20 remote control can also be used to select the maximum flow temperature for heating 

circuit 1 and to programme the desired heating times and room temperature. The E20 remote 

control will switch the heating function of this circuit on and off in accordance with the heating 

times and room temperatures programmed. 

NOTE:

  For mixed underfloor heating circuits, we recommend selecting a maximum flow 

temperature NO HIGHER THAN 45 ºC, to protect the underfloor heating installation from 

overheating. 

10.3

Functioning with a DHW tank (Optional) 

When the boiler is installed with a DHW production tank connected, the E20 remote control can be 

used to select up to two DHW temperatures and the desired DHW production times. The E20 

remote control regulates the DHW tank temperature at each particular time, and enables or 
disables the DHW function according to the times scheduled. 

The E20 remote control also has an option for enabling a function to protect against legionella 

bacteria (see instructions enclosed with the E20 remote control). 

10.4

Telephone relay function 

The E20 remote control is designed for connection to an external telephone relay. If a telephone 

relay is connected to the E20 remote control, the heating mode of heating circuit 1 and the DHW 
mode can be switched on and off from anywhere in the world, simply by making a telephone call 

(see instructions enclosed with the E20 remote control).