Radiant RS 20 E Installation And Maintenance Manual - page 14

Installation Manual 

SYSTEM BOILER  – Cod. 99951NA – November  2002

11 

•  check the pressure in the system: if this has gone down, restore it until the pressure gauge shows 1.5 bar. Close the tap 

on the filling loop once this operation is completed; 

STARTING UP THE BOILER 

• 

open the gas cock;

• 

turn on the boiler;

• 

set the selector to   winter;

• 

make sure that 5 and 6 light are ON (fig.2 pag.10) on the boiler panel. If light no. 4 is ON, it means water deficiency in the 

system: fill the system until a pressure of 1,5 bar has been reached (light no. 6 ON; fig 2 pag. 10) and then close the tap.  

The automatic ignition system will turn the burner ON. It may be necessary to repeat the procedure a few times to purge 

air from the pipes. To repeat the ignition procedure in any case wait 3 minutes before turning the boiler off and on again, 

then try to ignite it once more;

•  calibrate the boiler; 

•  after carrying out this operation, return the panel to its correct position and put the front casing back; 

REGULATING THE HEATING TEMPERATURE 

The heating temperature is regulated by turning knob 2 (fig.1 pag.10) to the temperature required, chosen from the different 

values printed around the selector. 

The temperature range goes from a minimum of 35°C to a maximum of 80°C. 

EMPTYING THE CENTRAL HEATING THE SYSTEM 

Whenever it is necessary to empty the system, proceed as follows: 

•  turn off the main power supply switch; 

•  wait for the boiler to cool down; 

•  undo the system drain tap and use a container to collect the water that runs out; 

WARNING 

Please ensure that the boiler in commissioned in line with all BENCHMARK BOOKLET REQUIREMENTS. Failure to do this 

may in validate the guarentee.