C.I.B. UNIGAS
- M039241CB
24
ADJUSTING AIR AND FUEL RATE
The oil flow rate can be adjusted choosing nozzle that suits the boiler/utilisation output and setting properly the delivery pressure
values.
Oil thermostat adjustment
All thermostats are located inside the control panel. To set the temperature use a small screwdriver.
Such temperature must be set during burner operation, checking temperature in the thermometer mounted on the pre-heating tank.
Thermostat TCI
(it gives the enabling signal to the oil N.C. valve): set TCI at about 20° less than TR.
Adjusting the pilot gas flow rate: gas valve Brahma EG12*R and pressure governor
To change the pilot gas valve flow rate, proceed as follows:
1
remove the protection on the bottom of the valve, moving it counterclockwise (see next picture);
2
rotate clockwise the nut 1 as shown in to close the valve or counterclockwise to open.
To perform a finest adjustment, act directly on the pressure governor as follows (see next picture):
3
remove the cap
T
: to increase the gas pressure at the outlet use a screwdriver on the screw
TR
as shown in the next picture. Screw
to increase the pressure, unscrew to decrease; once the regulation is performed, replace cap
T
.
ATTENTION:
before starting the burner up, be sure that the manual cutoff valves are open. Be sure that the mains
switch is closed.
.
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 fuel decrease slowly until the normal combustion
values are achieved.
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.
IMPORTANT! the combustion air excess must be adjusted according to the values in the following chart.
Recommended combustion parameters
Fuel
Recommended (%) CO
2
Recommended (%) O
2
Heavy oil
11 ÷ 12.5
4.7 ÷ 6.7
Safety resistors thermostat TRS:
it is factory preset
and sealed. Don not modify it!
When the set temperature is exceeded, check the reason
and reset it by means of the push button PR
Resistor thermostat TR:
check the best atomising oil
temperature on Fig. 13 and set it on TR.
Fig. 13
PR
1
T
TR
Brahma gas valve EGRx12
Pressure governor
Summary of Contents for PBY70
Page 7: ...C I B UNIGAS M039241CB 7 Overall dimensions mm boiler recommended drilling template ...
Page 16: ...C I B UNIGAS M039241CB 16 HYDRAULIC DIAGRAMS Fig 8 Hydraulic diagram 3ID0024 ...
Page 18: ...C I B UNIGAS M039241CB 18 Fig 9 Hydraulic diagram 3I2D 01 ...
Page 37: ...C I B UNIGAS M039241CB 37 ...
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