Riello RS5 Installation, Use And Maintenance Instructions page 28

4.5 COMBUSTION CHECK
It is advisable to set the burner according to the type of gas used and following the indications of the table:
EN 676
Theoretical max. CO
GAS
0 % O
G 20 11.7
G 25 11.5
G 30 14.0
G 31 13.7
IONIZATION CURRENT
The minimum current necessary for the con-
trol box operation is 5 μA.
The burner normally supplies a higher cur-
rent value, so that no check is needed.
To measure the ionization current, open the
connector CN1 (see electrical scheme page 8)
and insert your microammeter.
4.6 AIR PRESSURE SWITCH
Adjust the air pressure switch after having performed all other burner adjustments with the air pressure
switch set to the start of the scale.
With the burner operating at the required power, slowly turn knob clockwise until burner locks out.
Then turn the knob anti-clockwise by about 20% of the set point and subsequently check to see if burner
has started correctly. If the burner locks out again, turn the knob anti-clockwise a little bit more.
The burner leaves the factory with the pressure switch set at the beginning of the scale.
Attention:
As a rule, the air pressure switch must prevent the air pressure from lowering below 80 % of the adjustment
value as well as preventing the CO in the fumes from exceeding 1% (10,000 ppm).
To check this, insert a combustion analyser into the chimney, slowly close the fan suction inlet (for example
with cardboard) and check that the burner locks out, before the CO in the fumes exceeds 1 %.
4.7 BURNER START-UP CYCLE
Normal
Thermostat
Servomotor
Motor
Ignition transformer
Valve
Flame
Lock-out
A
Lock-out is indicated by a lamp on the control box (4, fig. 1, page 2).
20020956
AIR EXCESS: max. output 
Setting CO
2
 = 1.2
2
9.7
9.5
11.6
11.4
50s min.

2s
8 27s
%
2
 = 1.3
9.0
8.8
10.7
10.5
Fig. 10
Terminal block
control box
1
Lock-out, due to light failure
4s max.
11 GB
 1.2
– min. output 
CO
mg/kWh
mg/kWh

100

100

100

100
Connector
D5006
50s min.
5s max.

2s
8 27s
 1.3
NO
x

170

170

230

230
Probe
A
D10161