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18. Specifi cations of fl ow
rate/head at the plate
(Fi models only)
The pump used is the high-head, low-noise type suited for use in any
kind of single or dual pipe heating system.
The pump, fi tted in the boiler, is fi tted for operation at top speed (III).
The fi rst speed is not to be used since the fl ow rate/head specifi cation
does not meet the conditions of normal use.
CURVES OF FLOW RATE/HEAD AT THE PLATE
FLOW RATE m
Figure 12: Flow rate/head curves at the plate
19. Hydraulique resistance
performances
(FiN models only)
boiler
models
1.230 FiN
Flow resistance
∆t = 15°C
mm H
O
2
∆t =
difference between heating fl ow temperature and heating return
temperature.
/h
3
1.300 FiN
45
30
20. How to service and clean
the boiler
For a regular and economy operation of the boilers, It is necessary to
check, clean up and periodically revise the appliance. We recommend
to do these operations around every year.
Especially it is necessary to check:
•
That the installation is full, loaded to the correct water pressure and
that the pumps makes to circulate the water in a regular way.
•
The lighting and the combustion of the burner.
•
The operation of the safety and regulation devices (fl ue pressostat,
safety thermostat, resistance of NTC sensors).
•
The effi ciency of the electronic fl ame control (PCB).
•
The effi ciency of the fan.
•
The pressure of the gas to the burner and the gas consumption.
•
The cleaning of the fl ue ducts and the draught of the chimney
It will be necessary to clean also the cast iron exchanger.
Cleaning of the cast iron exchanger
To clean the cast iron exchanger it is necessary to remove the fl ue diverter
and the burner assembly.
Dismount of the fl ue diverter
• Take the top cover off the boiler by pulling it upwards from the
rear;
• Take the top cover off the sealed chamber, unscrewing the 8 cross-
slotted screws;
• Loosen the screws of the joint securing the fan connection pipe to the
concentric union;
• Disconnect the fan's electric leads;
• Disconnect the tubes connecting with the air - fl ue gas pressure
switch;
• Unscrew the two cross-slotted screws of the fl ue gas conveyor - fan
and remove the rear bracket;
• Completely remove the fl ue gas conveyor by raising it upwards
It is recommended to replace the sealing of the fl ue diverter at every
dismounting.
Dismount of the burner assembly
• Remove the front box of the sealed chamber.
•
Unscrew the three nuts fi xing the plate to the cast iron exchanger.
•
Disconnect the gas supply pipe acting on the joint positioned after the
gas valve
•
Remove the ignition and fl ame sensing electrodes
•
After having performed the above operations, the burner group can be
drawn out from the cast iron body. It is advisable to replace at every
removal the insulating panel in ceramic fi bre.
It is possible to effect the cleaning of the cast iron body with a brush in
the channels of smoke.
ATTENTION: After many intervention that concerns the gas circuit
it is absolutely necessary to check the perfect tightness of the joints
and there are no losses of a gas. We recommend however that these
operations are carried out by a Qualifi ed Service Engineer.
31
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