Riello RS 70 E - Safety Components; Measuring the Ionisation Current; Checking the Air and Gas Pressure on the Combustion Head

20068428
54
GB
Maintenance
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.
Tab. V
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.
Tab. W
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.
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.
EN 676
Air excess
CO
Max. output
  1.2
Max. output
  1.3
GAS
Theoretical
max. CO
2
0 % O
2
CO
2
% Calibration
mg/kWh
 = 1.2
 = 1.3
G 20 11.7 9.7 9  100
G 25 11.5 9.5 8.8  100
G 30 14.0 11.6 10.7  100
G 31 13.7 11.4 10.5  100
Safety component Life cycle
Flame control
10 years or 250.000
operation cycles
Flame sensor
10 years or 250.000
operation cycles
Gas valves (solenoid)
10 years or 250.000
operation cycles
Pressure switches
10 years or 250.000
operation cycles
Pressure adjuster 15 years
Servomotor (electronic cam)
10 years or 250.000
operation cycles
Oil valve (solenoid)
10 years or 250.000
operation cycles
Oil regulator
10 years or 250.000
operation cycles
Pipes/ oil fittings (metallic) 10 years
Flexible hoses (if present)
5 years or 30.000
pressurised cycles
Fan impeller 10 years or 500.000 start-ups
WARNING
Carefully check the polarities!
Fig. 37
D7977
D7978
Checking
air pressure
Checking
gas pressure
Fig. 38