Unigas HP60, Manual Of Installation - Use - Maintenance

Page: 27 / 60

C.I.B. UNIGAS - M03957CI
27
Actuator
The actuator provided can be either berger STM30../Siemens SQM40.. (see page 27) or Siemens SQL33.. (see page 30).
Adjustments - brief description
Adjust the air and gas flow rates at the maximum output (“high flame”) first, by means of the air damper and the adjusting cam respec-
tively.
z
Check that the combustion parameters are in the suggested limits.
z
Check the flow rate measuring it on the counter or, if it was not possible, verifying the combustion head pressure by means of a dif-
ferential pressure gauge, as described on par. “Measuring the gas pressure in the combustion head” on page 26.
z
Then, adjust the combustion values corresponding to the points between maximum and minimum: set the shape of the adjusting
cam foil. The adjusting cam sets the air/gas ratio in those points, regulating the opening-closing of the throttle gas valve.
z
Set, now, the low flame output, acting on the low flame microswitch of the actuator in order to avoid the low flame output increasing
too much or that the flues temperature gets too low to cause condensation in the chimney.
Adjustment procedure for gas operation
To change the burner setting during the testing in the plant, follow the next procedure.On the DUNGS MBC..SE gas valves group, set
the pressure regulator to 1/3 of its stroke, using a 2.5 allen key.
HP73A
only
The burner is factory-set wih the adjusting plate holes fully open, and the combustion head at its MAX position, so it is fit to work at the
maximum output.
To adjust the gas flow, partially close the holes, as follows:
1 loosen the three V screws that fix the adjusting plate D ;
2 insert a screwdriver on the adjusting plate notches and let it move CW/CCW as to open/close the holes;
3 once the adjustmet is performed, fasten the V screws.
Now, adjust the burner according to the actuator model provided.
IMPORTANT! the combustion air excess must be adjusted according to the in the following chart:
Recommended combustion parameters
Fuel
Recommended (%) CO
2
Recommended (%) O
2
Natural gas 9 ÷ 10 3 ÷ 4.8
Light oil 11.5 ÷ 13 2.9 ÷ 4.9
CAUTION: perform these adjustments once the burner is turned off and cooled.
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Pressure setting
V
D
closed holes
open holes