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Hot water tank cleaning (to be carried out every 2-3 years, depending on water ag-
gressiveness)
•
Remove the front panel of the hot water tank (6 - fig. 21).
•
Close the hot water tank on-off valves and open the drain cock.
•
After draining, remove the inspection flange and carry out cleaning. Use specific
products available on the market. Do not use metal tools to remove the scale.
•
After cleaning, refit the inspection flange and hot water tank front panel and open
the on-off valves.
Magnesium anode
The degree of deterioration of the magnesium anode (4 - fig. 21) can be checked directly
from the outside by unscrewing it from the hot water tank flange (after turning off the do-
mestic hot water supply and draining the hot water tank).
This check is advisable at least once a year.
If the water is very hard, above 20 degrees French, install a water softener in the system.
Draining the hot water tank and heating system
•
To drain the hot water tank, use the drain cock 233 of fig. 25 after closing the valves
for filling from the water mains; use a hot water drawing point (washbasin, shower,
etc.) as a vent.
•
To drain the heating system completely, use the cock 275 of fig. 25 after releasing
the shutters of the two non-return valves detail 179 of fig. 25 (also see fig. 22). Use
the radiator valves as vents.
If the boiler is connected to the system by service gate valves, check their complete
opening. If the boiler is located higher than the radiators, the part of the system in-
cluding the radiators must be drained separately.
•
To drain just the water contained in the boiler, close the shutoff valves and fully open
the cock (255 - fig. 25). Then release the shutters of the non-return valves (179 -
fig. 25). Lastly, open the cock 197 of fig. 25).
Before filling the system again, remember to close the drain cock and radiator
A
vent valves and lock the shutters of the non-return valves 179 of fig. 25.
A
A - Shutter locked
B - Shutter released
Burner assembly removal and cleaning
To remove the burner assembly:
•
Disconnect the power and turn off the gas ahead of the boiler;
•
Undo the nut "A" fixing the gas feed pipe ahead of the gas valve;
•
Disconnect the electrical connections and the gas pipe of the pilot burner assembly "D".
•
Undo the two nuts "B" fixing the combustion chamber door to the cast iron elements
of the boiler (fig. 23)
•
Remove the burner assembly and combustion chamber door.
Then check and clean the main burners and pilot burner. Only use a non-metallic brush
or compressed air to clean the burners and electrodes; never use chemical products.
During cleaning operations be careful not to damage the insulation of the combustion
chamber door "C".
Only use a non-metallic brush or compressed air to clean the burners and elec-
A
trodes; never use chemical products.
36
EN
B
fig. 22
cod. 3540T644 - Rev. 0 -
PEGASUS D K 130
C
fig. 23 - Removing the burners
Pilot burner assembly
fig. 24 - Pilot burner
1.
Combustion chamber door
2.
Inspection door
3.
Pilot burner
4.
Ignition electrode
5.
Detection electrode
6.
Pilot nozzle
7.
High voltage cable
8.
Gas feed pipe
/201
D
A
B
B
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