30
5. MAINTENANCE
5.1.
G
ENERAL
R
EMARKS
It is recommended that the following inspections be carried out on the boiler at least once a
year:
1.
Check the seals in the water group and, if necessary, replace the gaskets and restore
the seal to perfect working order.
2.
Check the seals in the gas group and, if necessary, replace the gaskets and restore
the seal to perfect working order.
3.
Visually check the overall state of the boiler.
4.
Visually check the combustion and, if necessary, disassemble and clean the burner.
5.
Following inspection 3, disassemble and clean the combustion chamber, if necessary.
6.
Following inspection 4, disassemble and clean the injector, if necessary.
7.
Clean the primary heat exchanger (see section 6.2)
8.
Regulate the correct rate of flow of the gas: rate of flow on ignition, partially loaded and
at maximum load.
9.
Check the correct functioning of the heating safety devices:
- temperature limit safety device.
10. Check the correct functioning of the gas group safety devices:
- absence of gas or flame safety device (Ionisation).
11. Check that the electrical connections are correct (in conformity with the instructions
manual).
12. Check the efficiency of the production of domestic hot water (test the rate of flow and
temperature).
13. Carry out a general inspection of the functioning of the boiler.
14. Check the characteristics for expulsion of the products of combustion.
15. Remove the oxide from the detection electrode by means of an emery cloth.
CLEANING THE EXHAUST SIDE
Remove the combustion chamber inspection hatch (see section 1.3). Check that the
exhaust passages between the blades of the block are free; if there are deposits present,
wash the blades with compressed air, water or a vinegar-based detergent.
NOTE: it is possible to use a brush in order to mechanically remove the residues.
Use of detergents:
-
soak the blades well
-
allow the detergent to act for about 20 minutes
-
rinse with a strong jet of water to remove the deposits (the control panel must be kept
closed)
-
make sure that there are no traces of detergents in the exchanger.
CLEANING THE WATER SIDE
Use detergents that dissolve CaCO3. Leave to act for a short time (in order not to damage
the aluminum) and then rinse. Make sure that the detergent does not remain inside the
exchanger.
Unscrew the lower part of the condensate trap and clean it. Lastly, fill it with water and
replace the stopper.
NB: if the boiler is not to be used for a prolonged period, the condensate trap should be
filled before igniting it again. A shortage of water in the trap is dangerous because there is
the risk of exhaust fumes escaping into the air.
5.2.
C
LEANING THE
P
RIMARY
E
XCHANGER
5.3.
C
LEANING THE
C
ONDENSATE
T
RAP
5.4.
O
PERATIONAL
T
EST
After having carried out the maintenance operations, fill the heating circuit to a pressure of
approx. 1.5 bar and release the air from the system. Also fill the domestic hot water system.
-
Place the boiler in operation.
-
If necessary, release the air again from the heating system.
-
Check the settings and the correct functioning of all the control, regulation and
monitoring parts.
-
Check the seal and the correct functioning of the system for expelling fumes/drawing
of combustion air.
-
Check that the boiler ignites properly and carry out a visual check on the burner flame.
