Table of Contents
Advertisement
6.3
Burner start-up
Close the remote controls and position the selector 1)(Fig. 29) to
" AUTO ".
Make sure that the lights or testers connected to the solenoids, or
the pilot lights on the solenoids themselves, indicate that no volt-
age is present.
D11968
6.4
Burner ignition
Once the above steps are complete, the burner should light.
If the motor starts up, but the flame does not appear and the con-
trol box goes into lockout, reset it and wait for a new ignition at-
tempt.
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.
6.5
Combustion air adjustment
Fuel/combustion air synchronisation is done with the relevant
servomotors (air and gas) by logging a calibration curve by
means of the electronic cam.
It is advisable, to reduce the loss and for a wide calibration field,
to adjust the servomotors to the maximum of the output used, the
nearest possible to the maximum opening (90°).
On the gas butterfly valve, fuel step according to the burner out-
put required, with servomotor completely open, is carried out by
the pressure stabiliser placed on the gas train.
The values given in Tab. L may be used as guidelines for correct-
ly calibrating combustion.
Start-up, calibration and operation of the burner
1
If voltage is present, stop the burner immediately and check the
electrical connections.
When the limit thermostat (TL) is closed, the " HEAT REQUEST "
2)(Fig. 29) signal must be on and the burner starts the starting cy-
cle.
The arrival of gas at the pipe coupling is indicated by the U-type
pressure gauge (Fig. 27).
If further burner lockouts occur, refer to the "Release procedure"
given in the equipment manual supplied.
Once the burner has ignited, proceed with the global adjustment
of the burner.
EN 676
Theoretical
max. CO
GAS
2
0 % O
2
G 20
11.7
G 25
11.5
G 30
14.0
G 31
13.7
27
GB
2
Air excess
Max. output
Max. output
λ ≤ 1.2
λ ≤ 1.3
CO
% Calibration
2
λ = 1.3
λ = 1.2
9.7
9
9.5
8.8
11.6
10.7
11.4
10.5
Fig. 29
CO
mg/kWh
≤ 1000
≤ 1000
≤ 1000
≤ 1000
Tab. L
20087244
Advertisement
Table of Contents
