33
8.2 - 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 -
positioned in the rear part of the smoke
pipes - at least every 15-20 days of boiler
operation, to avoid that the combustion
residues can block them so that their removal
becomes extremely difficult.
For this operation it is necessary to get access
from the back after removal of the cleaning
doors (pos. 1) and the gasket (pos. 2 of fig.
36); in this way all the turbulators (pos. 3)
can 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
cleaning doors on the smoke chamber.
Besides it will be necessary to verify the good
operation of the protection and control
devices (thermostats, thermometers) of the
boiler and of the plant (manometers, flow
and pressure switches, expansion vessels)
and all the safety devices.
In this occasion it will be necessary to notice
the quantity of reinstatement water used and
decide, also in base to its hardness, an
intervention of preventive descaling.
It must be considered that the calcium and
magnesium salts dissolved in the raw water,
with repeated reinstatements, can cause
deposits in the boiler that hinder the inner
circulation and subsequent overheating of
the wall plates with possible serious damages
that cannot be attributed to the constructive
geometry and/or to the materials used and/
to the constructive technique and, therefore,
they are not covered by guarantee.
On the occasion of the ordinary maintenance
it is useful to perform a small discharge from
the boiler to verify if sludges escape.
In affirmative case, it will be necessary to
prolong the discharge up to get clear water.
At the end of the drainage it will be necessary
to reestablish the level of the water in the
system.
At the end of the smoke circuit cleaning, to
the next restart check around the burner plate
and the smoke chamber for smoke leaks. In
the case some smoke leaks were noticed,
first of all tighten the screws fitting the smoke
and, not getting result, it will be necessary to
replace the sealing gasket.
Similarly it will be necessary to act on the
front door, increasing at first the tightening
of the nuts (after having loosened the inner
counternuts) and then, if necessary, by
replacing the whole gasket.
If it was necessary to center the sealing
gaskets on the sealing ring of the door it is
possible to adjust the door position by acting
as suggested on the paragraph 2.6.
MAINTENANCE
8
8.1 - 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
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 cleaning door on the rear of the
smoke chamber and remove, with a
vacuum cleaner all the soot.
-
Relocate the cleaning door 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.
7.3 - SWITCH OFF OF THE
BOILER
-
Switch OFF the burner (switch No.12 to 0
position).
-
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
long period close also the gate valves of
the fuel.
At the end check and, if necessary, restore
the sealing of the connection of the chimney
and of the burner with the door.
The performed operations must be recorded
on the log book of C.H. system.
