Unigas PG70, Manual Of Installation - Use - Maintenance

Page: 17 / 56

CIB UNIGAS - M039191CA
17
ADJUSTMENTS
Adjustments - brief description
Adjust the air and fuel 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.
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Check the oil flow rate.
z
Then, adjust the combustion values corresponding to th e points between maximum and minimum: set the foil shape of the ad ju-
sting cam. The adjusting cam sets the air/fuel ratio in those points, regulating the opening-closing of the fuel governor.
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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
To change the burner setting during the testing in the plant, follow the next procedure, according to the actuator model provided (mod.
Berger STM30.. or mod. Siemens SQL..).
z
PG60: Berger STA12..
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PG70-PG81: Berger STM30.. / Siemens SQL33..
ATTENTION: before starting the burner up, be sure that the manual cutoff valves are open. Be sure that the mains
switch is closed.
Before starting up the burner, make sure that the return pipe to the tank is not obstructed. Any obstruction would
cause the pump seal to break.
.
ATTENTION:
During commissioning operations, do not let the burner operate with insufficient air flow (danger of formation
of carbon monoxide); if this should happen, make the gas decrease slowly until the normal combustion values are achieved.
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
Light oil 11.5 ÷ 13 2.9 ÷ 4.9