Unical ELLPREX Series, Installation, Use And Servicing Instruction

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4.4 - OPERATION OF THE

BOILER

To ascertain that the form and the dimension of
the burner flame, which we estimate very
important, are the correct ones for the good
operation of the boiler, it is suggested to make
a visual inspection of the furnace at least one
month after the first lighting.
The furnace cylinder shall show a homogeneous
coloration for all of its length to demonstrate
that the flame reverses in proximity of the blind
bottom.
Contrarily, a furnace that underlines a clean
distinction of colour among two zones (the
anterior part clearer than the rear part), it would
be the typical example of a flame of inadequate
length, for which the adjustment of the burner,
to avoid located overheatings, with consequent
probable serious damages, needs to be
immediately revised.
Similarly, the state of the exchange surfaces on
the water side, where possible, i.e. on the boi-
lers beginning from the model ELL 1100,

standard equipped with inspection hand  holes,
and in the case the presence of limestone,
sludges or deposits is found, the opportune
provisions to seek of it and to eliminate its causes
must be taken.
Such control must be effected within the first
months of exercise of the boiler, in any case
compulsorily to the first stop of the heating
system, at the end of the heating season or on
the occasion of standstills for other extraordinary
interventions, particularly in the case of heating
systems with large water content.
The HIGH EFFICIENCY ELLPREX boilers are
forseen to operate with a return water
temperature never below 54 °C when opera-
ted on light oil, and never below 59 °C when
operated on gas, to avoid (or, at least, to
reduce) the smoke acid condensation
phenomenon, which can be the reason of a
premature deterioration of the steel boiler body.
The working thermostat, pos. 32 of the panel
board, must be set at a temperature of
approximately 80 to 85 °C.

The room temperature will be compulsorily
adjusted through a mixing valve and,
eventually, an outer compensator.
To homogenise the water temperature, or avoid
as maximum as possible, returns into the boiler
at a temperature below 54 °C when operated on
oil, or 59°C when operated on  gas, a properly
dimensioned shunt pump must be fitted between
flow and return pipes of the boiler.
N.B.The metal sheet corrosion due to the acid
condensate is not covered by the guarantee
because it depends only from the operation of
the C.H. system.
The ELLPREX panel board is equipped with a
low temperature thermostat not allowing the
operation of the pump when the boiler
temperature is below 50 °C (protection against
cold starts).

4.5 - SWITCH OFF OF THE

BOILER

- Switch OFF the burner (switch No.12 to 0

position).

5.1 - GENERAL RULES

Before effecting any operation of cleaning or
maintenance, disconnect the boiler from the
electrical supply acting on the main switch onto
the panel board.
In case of failure or bad operation of the boiler,
switch it off, abstaining your self from any
attempt of reparation or direct intervention.
Exclusively address to professionally qualified
personnel.
The possible reparation of the boiler must be
effected by an authorized service center using
only original spare parts.
The non respect of the above can jeopardize

- Leave the pumps working up to when they are

not stopped by the minimum thermostat.

- Switch Off the power to the boiler panel board.
- If it is decided not to use the boiler for a

MAINTENANCE

the safety of the boiler.
To guarantee the efficiency of the boiler and
for its correct operation it is essential to submit
the boiler to an annual maintenance, through a
professionally qualified technician, according to
the indications of the manufacturer.
When it is decided not to use the boiler
anymore, the parts which can be potential
sources of danger shall be made harmless.
After a month of boiler operation, open the front
door and ascertain the smoke pipes are clean.
In case of a heavy dirtiness:
- Remove the turbulators from smoke pipes.

- Clean all the smoke pipes using the brush

delivered with the boiler.

- Open the two cleaning doors on the sides

of the smoke chamber and remove, with a
vacuum cleaner all the soot.

- Relocate the two cleaning doors and the

turbulators; then close the boiler front door
and check for soundness all around the
sealing rope.

- Then adjust the burner.
Note: With a burner properly adjusted only a
cleanup at the season end is necessary.

5

long period close also the gate valves of
the fuel.

5.2 - ORDINARY

MAINTENANCE

The boiler operating condition are very different
from one case to the other and depend on the
fuel used, on the adjustment of the burner, on
the number of starting, on the C.H. system
characteristics, etc. and for that reason it is
not possible to esthablish, in advance, the
frequence of the maintenances.
It is, then, necessary that the technician, who

performs the first cleaning, esthablish the
cleaning frequency on the base of the boiler
status.
Generally, we suggest the following frequency,
according to the fuel used:
- Gas fired boilers: once a year.
- Oil fired boilers: twice a year or more often

if there is reason to doubte of  their
adjustment.

In any case the local rules in force have to

complied with.
We suggest to shake the turbulators, without
removing them from the smoke tubes, at least
once an month of operation, not to allow the soot
blocking them and making them extremely diffi-
cult to be removed.
During the operations of ordinary maintenance
it will be necessary to brush the tube bundle  -
after the removal of the turbulators - and the
furnace and collect the soots through the