Adjustments Prior To Ignition (Gas); Burner Start-Up; Burner Ignition; Burner Adjustment - Riello RLS 190/M MZ Installation, Use And Maintenance Instructions

6.5

Adjustments prior to ignition (gas)

Combustion head adjustment is already described on page 25.
In addition, the following adjustments must also be made:
 Open the manual valves upstream of the gas train.
 Adjust the minimum gas pressure switch to the start of the
scale (Fig. 41).
 Adjust the maximum gas pressure switch to the end of the
scale (Fig. 40).
 Adjust the air pressure switch to the start of the scale
(Fig. 39).
 Purge the air from the gas line.
We recommend using a plastic tube routed outside the
building and to purge air until gas is smelt.
 Fit a U-type pressure gauge (Fig. 34) to the gas pressure
test point on the pipe coupling.
The manometer readings are used to calculate MAX burner
output using the Tab. J.
 Connect two lights or testers in parallel to the two gas line
solenoid valves VR and VS in order to check the exact
moment at which voltage arrives.
This operation is not required if each of the two solenoid
valves is equipped with a pilot light that signals voltage
passing through.
6.6

Burner start-up

Feed electricity to the burner via the disconnecting switch on the
boiler panel.
Close the thermostats/pressure switches and turn the switch in
Fig. 35 to position "MAN".
As soon as burner starts, check the fan rotation direction
through the flame inspection window.
Check that the lamps or testers connected to the
solenoid valves, or the pilot lights on the solenoid
valves, indicate that no voltage is present. If they
indicate the presence of voltage, stop the burner
DANGER
immediately and check the electric connections.
6.7

Burner ignition

If the motor starts up, but the flame does not appear and the
control box goes into lockout, reset it and wait for a new ignition
attempt.
If ignition is still not achieved, it may be that gas is not reaching
the combustion head within the safety time period of 3 seconds.
In this case, increase gas ignition delivery.
The arrival of gas to the sleeve is indicated by the U-type
pressure gauge (Fig. 34, on page 26).
Once ignition has taken place, proceed with burner global
calibration operations.
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Start-up, calibration and operation of the burner
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
delivery at the minimum.
CAUTION
6.7.1

Burner adjustment

The optimum adjustment of the burner requires an analysis of
flue gases at the boiler outlet.
Adjust in sequence:
1

Ignition output

2 Maximum output
3 Minimum output
4 Intermediate outputs between the two
5 Air pressure switch
6 Maximum gas pressure switch
7 Minimum gas pressure switch
6.7.2 Ignition output
According to standard EN 676.
Burners with MAX output up to 120 kW
Ignition can occur at the maximum operation output level.
Example:
• max. operation output: 120 kW
• max. ignition output:
26 GB
1 2
D791
120 kW
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Fig. 34
Fig. 35