31
20027761
GB
Start-up, calibration and operation of the burner
6.4
Burner firing
Having completed the checks indicated in the previous heading,
the burner should fire.
If the motor starts but the flame does not appear and the control
box goes into lock-out, reset and wait for a new firing attempt.
If firing 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 firing delivery.
The arrival of gas at the sleeve is indicated by the U-type manom-
eter (Fig. 35).
After burner firing a complete burner adjustment should be per-
formed.
6.5
Fuel change
There are two possible options for changing fuel:
1
using selector 3) (Fig. 36);
2
using a remote selector connected to the main terminal
board.
By setting selector 3) (Fig. 36) to EXT, you activate the remote
fuel selection facility.
In this position, if no remote selector is fitted, the display shows
the priority fuel.
6.6
Combustion air adjustment
Fuel/combustion air is synchronised by means of a servomotor
connected to two variable-profile cams which operate the air de-
livery 1) (Fig. 37) and fuel delivery 2) (Fig. 37) dampers and, by
means of suitable leverages, the combustion head.
To reduce pressure loss and to have a wider adjustment range,
it is best to set the servomotor to the maximum output used, as
near to maximum opening (130°) as possible.
On the gas butterfly valve, the fuel’s partial setting adjustment
based on required output, with the servomotor fully open, is made
by using the pressure stabilizer on the train.
The value reported in the table can be a reference for a good
combustion setting.
6.6.1
Maximum output
Set the servomotor to maximum opening so that the air dampers
are fully open.
6.6.2
Minimum output
Max output of the burner must be set within the firing rate range
shown on pag. 10.
Turn the "decrease output" selector 2) (Fig. 36) and keep it
turned towards "-" until the servomotor has closed the air damper
and the gas butterfly valve is at 35° (factory setting).
Adjustment of air delivery
Progressively adjust the starting profile of cam 1) (Fig. 38) by
turning the screws 2) (Fig. 38).
It is preferable not to turn the first screw since this is used to set
the air gate valve to its fully-closed position.
EN 676
Excess air
Max output
1,2
Min output
1,3
GAS
Theoretical max.
CO
2
0 % O
2
Calibration CO
2
%
CO
mg/kWh
= 1,2
= 1,3
G 20
11,7
9,7
9.0
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
EN 267
Excess air
Max output
1,2
Min output
1,3
Theoretical max. CO
2
0 % O
2
Calibration CO
2
%
CO
mg/kWh
= 1,2
= 1,3
15,2
12,6
11,5
100
1
2
D8368
Fig. 37
Summary of Contents for RLS 650/M MX
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