Checking The Air And Gas Pressure On The Combustion Head - Riello RLS 200/EVi MX Installation, Use And Maintenance Instructions

Electrical current to flame sensor
Clean the glass cover from any dust that may have accumulated.
To remove the sensor, pull out outwards; it is only pressed in.
Min value for a good work: 70 µA.
If the value is lower, it could be due to:
- exhausted sensor
- low voltage (lower than 187 V)
- bad regulation of the burner
In order to measure the current, use a microammeter of 100 µA
d.c., connected in series to the flame sensor, as in the scheme,
with a capacitor of 100 µF - 1V d.c. at the same level of the instru-
ment.
D1143
LIGHT OIL OPERATION
Pump
The depression must be less than 0.45 bar.
Unusual noise must not be evident during pump operation.
If the pressure is found to be unstable or if the pump runs noisily,
the flexible hose must be detached from the line filter and the fuel
must be sucked from a tank located near the burner.
This measure permits the cause of the anomaly to be traced to
either the suction piping or the pump.
If the problem lies in the suction line, check the filter is clean and
that air is not entering the piping.
Filters
Check the filtering baskets on line and at nozzle present in the
system.
Clean or replace if necessary.
If rust or other impurities are observed inside the pump, use a
separate pump to lift any water and other impurities that may
have deposited on the bottom of the tank.
Nozzles
It is advisable to replace nozzles once a year during periodical
maintenance.
Do not clean the nozzle openings.
Hoses
Check that these are in good conditions.
Fuel tank
Approximately every 5 years, suck any water on the bottom of the
tank using a separate pump.
Maintenance
Combustion
In case the combustion values found at the beginning of the inter-
vention do not respect the standards in force or, in any case, do
not correspond to a proper combustion, contact the Technical As-
sistance Service in order to carry out the necessary adjustments.
EN 267
Theoretical max CO
0 % O
2
15.2
Gas leaks
Make sure that there are no gas leaks on the pipe between the
gas meter and the burner.
Fig. 56
Gas filter
Change the gas filter when it is dirty.
Combustion
In case the combustion values found at the beginning of the inter-
vention do not respect the standards in force or, in any case, do
not correspond to a proper combustion, contact the Technical As-
sistance Service in order to carry out the necessary adjustments.
EN 676
Theoretical max
CO
GAS
0 % O
G 20 11.7
G 25 11.5
G 30 14.0
G 31 13.7
7.2.4 Checking the air and gas pressure on the
combustion head
To carry out this operation it is necessary to use a pressure gauge
to measure the air and gas pressure at the combustion head, as
shown in Fig. 57.
Gas 
pressure
control
57 GB
Air excess
Max. output Min. output
  1.2
CO % Calibration
2 2
 = 1.2
12.6
GAS OPERATION
Air excess
Max. output Max. output
  1.2
CO % Calibration
2
2
 = 1.2
2
9.7
9.5
11.6
11.4
20124909
CO
  1.3
mg/kWh
 = 1.3
 100
11.5
Tab. W
CO
  1.3
mg/kWh
 = 1.3
 100
9
 100
8.8
 100
10.7
 100
10.5
Tab. X
Air 
pressure
control
Fig. 57
20109570