Table of Contents
Advertisement
6.4
Burner starting
Close load controls and set switch 1) (Fig. 33) to "MAN".
Make sure that the lamps or testers connected to the solenoids,
or pilot lights on the solenoids themselves, indicate that no volt-
age is present. If voltage is present, then immediately stop the
burner and check electrical connections.
6.5
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.
6.6
Fuel change
There are two possible options for changing fuel:
1
using selector 3) (Fig. 33);
2
using a remote selector connected to the main terminal
board.
6.7
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. 34) and fuel delivery 2) (Fig. 34) 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.
Start-up, calibration and operation of the burner
1
0 AUTO MAN
In this case increase gas firing delivery.
The arrival of gas at the sleeve is indicated by the U-type manom-
eter (Fig. 32).
After burner firing a complete burner adjustment should be per-
formed.
By setting selector 3) (Fig. 33) to EXT, you activate the remote
fuel selection facility.
In this position, if no remote selector is fitted, the display shows
the priority fuel.
D8368
29
GB
2
-
+
D3108
2
1
3
D3531
Fig. 33
Fig. 34
20010305
Advertisement
Table of Contents
