14
FINAL CHECKS
• Obscure the photocell and switch on the control circuit:
the burner should start and then lock-out about
5 s
after starting.
• Illuminate the photocell and switch off the control
devices: burner should go into lock-out.
• Obscure the photocell while the burner is operating:
flame should go out and burner lock out within 1 s.
• Switch off control devices while the burner is operat-
ing: the burner should stop.
MAINTENANCE
Combustion
An analysis of the flue gases at the boiler outlet is
required . Significant differences with respect to the pre-
vious measurements indicate the points where more
care should be exercised during maintenance.
Pump
The pump delivery pressure must be stable at 290 PSI.
The suction must be less than 6.5 PSI.
Unusual noise must not be evident during pump opera-
tion.
If the pressure is found to be unstable or if the pump
runs noisily, the flexible hose must be detached from the
line filter and the fuel must be sucked from a tank
located near the burner. This measure permits the
cause of the problem to be traced to either the suction
line or the pump.
If the problem lies in the suction line, check to make sure
that the filter is clean and that air is not entering the pip-
ing.
Filters
(A)
Check the following filter boxes:
• on line 1)
• at nozzle 2)
and clean or replace as required. If rust or other impuri-
ties are observed inside the pump, use a separate pump
to suck out any water and other impurities that may have
deposited on the bottom of the tank.
Fan
Check to make sure that no dust has accumulated
inside the fan or on its blades, as this condition will
cause a reduction in the air flow rate and create polluting
combustion.
Combustion head
Check to make sure that all the parts of the combustion
head are in good condition, positioned correctly, free of
all impurities, and that no deformation has been caused
by operation at high temperatures.
Nozzles
Do not clean the nozzle orifices.
Replace the nozzles every 2-3 years or whenever nec-
essary. Combustion must be checked after the nozzles
have been changed.
Photocell
(cad cell) (B)
Clean the glass cover from any dust that may have
accumulated. Photocell 1) can be removed by pulling it
outward forcefully.
Flame inspection window (C)
Clean the glass.
Flexible hoses
Check to make sure that the flexible hoses are still in
good condition.
Boiler
Clean the boiler as indicated in its accompanying
instructions in order to maintain all the original combus-
tion characteristics intact, especially the flue gas tem-
perature and combustion chamber pressure. Lastly,
check the condition of the flue gas stack.
TO OPEN THE BURNER (D)
- Switch off the electrical power
- Loosen screws 1) and withdraw the cover 2)
- Unscrew screws 3)
- Fit the two extensions 4), supplied with a kit, onto the
slide bars 5)
- Pull part A backward keeping it slightly raised to avoid
damaging the disk 6) on blast tube 7).
FUEL PUMP AND/OR COUPLINGS REPLACEMENT
(E)
As per fig. (E), dimension X should be set at
3/32
”.
(A)
(B)
(D)
(C)
D2012
D1254
D709
D1980
(E)
dimension
D2854
X
