Unigas PN1025, Manual Of Installation - Use - Maintenance

Page: 26 / 99

C.I.B. UNIGAS
- M039117CC
26
Adjustments - brief description
z
Adjust the air and oil flow rates at the maximum output (“high flame”) first, by means of the air damper and the adjusting cam res-
pectively.
z
Check that the combustion parameters are in the suggested limits.
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/fuel ratio in those points, regulating the opening-closing of the fuel governor.
z
Now set 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 the flues temperature getting too low to cause condensation in the chimney.
Oil Flow Rate Settings
1 check the fan motor rotation (see “Fan motor and pump motor direction” on page 9);
2 with the electrical panel open, prime the oil pump acting directly on the related CP contactor (see next picture): check the pump
motor rotation and keep pressing for some seconds until the oil circuit is charged;
Fig. 12
3 bleed the air from the M pressure gauge port (Fig. 13) by loosing the cap without removing it, then release the solenoid starter.
4 Before starting the burner up, drive the high flame actuator microswitch matching the low flame one (in order to let the burner ope-
rates at the lowest output) to safely achieve the high flame stage.
5 cam IV (stroke limitation cam) must be set a little higher than the cam III to limit the output during the first seconds the flame appe-
ars;
NOTE: cam IV must shift according to cam III.
6 Turn the burner on by means of its main switch A (see next picture): if the burner locks (LED B on in the control panel) press the
RESET button ( C ) on the control panel - see chapter “OPERATION”.
7 Start the burner up by means of the thermostat series and wait unitl the pre-purge phase comes to end and that burner starts up;
8 drive the burner to high flame stage, by means fo the thermostat TAB (high/low flame thermostat - see wiring diagrams), as far as
fully-modulating burners, see related paragraph.
9 Then move progressively the microswitch to higher values until it reaches the high flame position; always check the combustion
values (see next steps).
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 4.2 ÷ 6.2
Suntec T..
CP
M
VR
Fig. 13