Manual Unical Ellprex (page 30 of 32) (English)

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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

boilers 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 operated

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.

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.

- If it is decided not to use the boiler for a

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

difficult 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

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Unical Ellprex Manual

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