Start-Up, Calibration And Operation Of The Burner; Notes On Safety For The First Start-Up; Adjustments Prior To Ignition; Gas Pressure Switch - Riello RS5 Installation, Use And Maintenance Instructions

6

Start-up, calibration and operation of the burner

6.1

Notes on safety for the first start-up

The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
WARNING
6.2

Adjustments prior to ignition

 Check the adjustment of the head as shown in page 17.
 Check the adjustment of the air damper servomotor.
 Slowly open the manual valves situated upstream from the
gas train.
 Adjust the air pressure switch to start of the scale.
 Purge the air from the gas line.
6.3

Gas pressure switch

To calibrate the gas pressure switch, refer to the
gas train manual.
WARNING
6.4

Air pressure switch

The air pressure switch is set after all other adjustments have
been made. Begin with the switch at the start of the scale.
With the burner function at the required output, turn the knob
slowly in a clockwise direction until burner lockout.
Now turn the knob one notch anti-clockwise and repeat the burn-
er start-up to check everything is regular.
If the burner locks out again, turn the knob again by half a notch.
6.5

Combustion adjustment

In conformity with EN 676, the application of the burner on the
boiler, the adjustment and testing must be carried out in compli-
ance with the instruction manual of the boiler, including control of
concentration in the flue gases, their tempera-
the CO and CO
2
ture and the average temperature of the water in the boiler.
It is advisable to set the burner according to the type of gas used
and following the indications in Tab. O.
EN 676
Theoretical max
GAS
G 20
G 25
G 30
G 31
20198379
Start-up, calibration and operation of the burner
CO2
 = 1.2
0 % O2
11.7 9.7
11.5 9.5
14.0 11.6
13.7 11.4
Check the correct working of the adjustment, com-
mand and safety devices.
WARNING
Refer to paragraph "Safety test - with gas ball
valve closed" on page 25 before the first start-
up.
WARNING
We recommend using a plastic tube routed outside the building
and to purge air until gas is smelt.
Before starting up the burner, it is good practice to
adjust the gas train so that ignition takes place in
conditions of maximum safety, i.e. with gas deliv-
ery at the minimum.
CAUTION
In conformity with the standard, the air pressure
switch must prevent the air pressure falling be-
low 80% of the adjusted value and the CO in the
flue gases exceeding 1% (10,000 ppm).
WARNING
To check this, insert a combustion analyser in
the flue, slowly reduce the fan air setting (for ex-
ample with a piece of cardboard) and verify that
the burner locks out before the CO value in the
flue gases exceeds 1%.
Excess air: max. output   1.2 – min. output   1.3
Setting CO2 %
 = 1.3
9.0
8.8
10.7
10.5
24 GB
CO NOx
mg/kWh mg/kWh
 100  170
 100  170
 100  230
 100  230
Tab. O