Radiant RS 20 E Installation And Maintenance Manual - page 16

Installation Manual 

SYSTEM BOILER  – Cod. 99951NA – November  2002

13 

TR1

FU

SE

 2

A

TR2

CM1

P2

MIN.GAS

CM1

CM1

SELECTOR

SELECTOR

Link disabled on CM1 selector.

Timing 3 min.

Timing 0 min.

Link inserted on CM1 selector.

GAS TYPE CONVERSION 

Conversion of the boiler from natural 

gas to LPG and vice versa must be 

performed by qualified personnel 

only. Conversion is performed as 

follows: 

a)  turn off the main power switch; 

b)  close the gas cock; 

c)  substitute the jets on the main 

burner as follows: 

undo the gas pipe 5 (fig.1) from 

the burner manifold using a size 

24 spanner; 

separate the burner manifold 2 from 

the burner ramps 1 by undoing the 4 

screws  3 using a cross head 

screwdriver; 

fit new jets 4 to the burner suitable 

for the type of gas the boiler will run 

on using a no. 7 spanner. The jets 

must be fitted with new gaskets; 

reassemble the entire burner unit. 

Use the soapy water method to 

check for gas leaks each time gas 

connections are dismantled and 

reassembled; 

d)   replace the gas setting plate that 

indicates the type of gas and nominal 

pressure for the boiler. When 

converting the boiler to work with a 

different type of gas, remove the 

existing plate and replace it with the 

new one supplied in the conversion 

kit . 

e)  calibrate the new max. and min. 

settings for the gas pressure. 

SLOW IGNITION ADJUSTMENT 

(fig. 2) 

This is a slow ignition regulator whose 

trimmer is factory set to the minimum. 

For adjustment proceed as follows: 

if turned clockwise the gas pressure at 

the burner increases on ignition while 

turning counter-clockwise decreases the 

gas pressure. 

LINK TO ADJUST SLOW IGNITION 

This allows the various ignitions to be delayed once the boiler has reached the optimum temperature.  

CM1 link on main p.c.b. (fig.3)  

The timing range goes from 0 with the link inserted on CM1 selector (fig. 4), to 3 minutes with the link disabled on CM1 selector 

or eventually positioned on the side pin as shown in figure no,5.

Fig. 2 

GAS BURNER UNIT

1

2

3

4

5

Fig. 1

Fig. 4 

Fig. 5 

Fig. 3 

Fig. 1 

Fig. 2