Safety Components; Measuring The Ionisation Current; Checking The Air And Gas Pressure On The Combustion Head - Riello RS 70/E Installation, Use And Maintenance Instructions

Gas filter
Replace the gas filter when it is dirty.
Flame inspection window
Clean the glass of the flame inspection window.
Boiler
Clean the boiler as indicated in its accompanying instructions in
order to maintain all the original combustion characteristics intact,
especially the flue gas temperature and combustion chamber
pressure.
Combustion
If the combustion values found at the start of the intervention do
not satisfy current standards or anyway indicate a poor state of
combustion (consult the table below), contact the Technical As-
sistance Service for the necessary adjustments.
EN 676
Max. output
Theoretical
max. CO
GAS
2
0 % O
2
G 20 11.7
G 25 11.5
G 30 14.0
G 31 13.7
7.2.4

Safety components

The safety components should be replaced at the end of their life
cycle indicated in the Tab. W.
The specified life cycles do not refer to the warranty terms indi-
cated in the delivery or payment conditions.
Safety component
Flame control
Flame sensor
Gas valves (solenoid)
Pressure switches
Pressure adjuster
Servomotor (electronic cam)
Oil valve (solenoid)
Oil regulator
Pipes/ oil fittings (metallic)
Flexible hoses (if present)
Fan impeller
20068428
Air excess
Max. output
  1.2   1.3
CO % Calibration
2
mg/kWh
 = 1.3
 = 1.2
9.7 9
9.5 8.8
11.6 10.7
11.4 10.5
Life cycle
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
15 years
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
10 years
5 years or 30.000
pressurised cycles
10 years or 500.000 start-ups
Maintenance
7.2.5

Measuring the ionisation current

The burner is fitted with an ionisation system to check that a
flame is present.
The minimum current for control box operation is 4 µA. The Op-
erator Panel visualises "30%" (see "Parameter list" at page 47,
parameter no. 954).
The burner provides a much higher current, so controls are not
normally required.
However, if it is necessary to measure the ionisation current, dis-
connect the plug-socket on the ionisation probe cable and insert
a direct current microammeter with a base scale of 100 µA - see
Fig. 37.
Carefully check the polarities!
WARNING
CO
 100
 100
 100
 100
Tab. V
D7977
7.2.6 Checking the air and gas pressure on the
combustion head
To carry out this operation a pressure gauge must be used to
measure the air and gas pressure at the combustion head, as
shown in Fig. 38.
Checking
gas pressure
D7978
Tab. W
54 GB
Checking
air pressure
Fig. 37
Fig. 38