30
EN
Cleaning the boiler and flue
For proper cleaning of the boiler (see fig. 11):
•
Turn off the gas ahead of the unit and disconnect the power supply
•
Remove the front panel of the boiler (fig. 7).
•
Lift the casing cover by pressing upwards.
•
Remove the insulation 5 covering the anti-backflow device.
•
Remove the fume chamber closing plate and insulation.
•
Remove the burner assembly (see previous par.).
•
Clean from the top downwards, using a flue brush. The same operation can be car-
ried out from the bottom upwards.
•
Clean the fume exhaust ducts between the cast iron elements of the boiler shell with
a vacuum cleaner.
•
Carefully refit all the previously removed parts and check the tightness of the gas
circuit and the combustion ducts.
•
During cleaning operations take care not to damage the fume thermostat bulb
mounted on the back of the fume chamber.
fig. 11 - Boiler cleaning
1
Casing cover
2
Fume chamber closing plate
3
Flue brush
4
Combustion analysis plug
5
Insulation
4.4 Troubleshooting
A
To avoid unnecessary expense, before calling the After-Sales Service make
sure the boiler has not stopped due to no power or gas.
5. TECHNICAL DATA AND CHARACTERISTICS
5.1 Dimensions and connections
fig. 12 - Dimensions and connections
5.2 General view and main components
fig. 13 - General view and main components
Fault
Cure
After several lighting attempts,
the electronic controller shuts
down the boiler.
Clean the pilot burner nozzles with compressed air.
Check the regular gas flow to the boiler and that air has been eliminated from the pipes.
Make sure the electrodes are correctly positioned and free of deposits (see
fig. 10).
Make sure the boiler is connected to an efficient earth connection.
Check the connections at the ignition and ionisation electrodes.
No discharge between elec-
trodes in the ignition stage.
Make sure the electrodes are correctly positioned and free of deposits (see
fig. 10).
Control thermostat adjusted too low.
Check the power supply.
Check the connections at the ignition and ionisation electrodes.
Check the connections at the electronic flame controller.
Make sure the LINE and NEUTRAL are not inverted and that the earth contacts are efficient.
Check the inlet gas pressure and any open pressure switches.
Reset the safety thermostat.
Make sure the room thermostat is closed.
The burner burns poorly: flames
too high, too low or too yellow
Gas valve filter dirty.
Check the gas supply pressure.
Gas nozzles dirty.
Make sure the boiler is not dirty.
Make sure the ventilation in the room where the unit is located is sufficient for proper com-
bustion.
Smell of unburnt gas
Make sure the boiler is clean.
Check the flue draught.
Make sure gas consumption is not excessive.
The boiler works but the temper-
ature fails to increase
Check correct operation of the 2-stage control thermostat.
Make sure the gas valve 2nd stage operator (max. power) is fed.
Make sure gas consumption is not less than that provided for.
Make sure the boiler is perfectly clean.
Make sure the boiler is adequate for the system.
Make sure the heating pump is not blocked.
Temperature of water to system
too high or too low
Check correct operation of the 2-stage control thermostat.
Make sure the pump is not blocked.
Make sure the characteristics of the circulating pump are adequate for the system.
Explosion at burner. Ignition
delays
Make sure the gas pressure is sufficient and that the boiler casing is not dirty.
The control thermostat switches
back on with an excessive tem-
perature difference
Make sure the thermostat bulb is properly inserted in the sheath.
Check correct operation of the 2-stage thermostat.
The boiler produces condensa-
tion water
Make sure the boiler is not operating at too low temperatures (below 50°C).
Make sure gas consumption is regular.
Check the efficiency of the flue.
The boiler shuts down for no
apparent reason
The safety thermostat cuts in due to an overtemperature.
3
2
1
4
5
Type and model
A
B
C
D
E
F
a1 heating return
a2 heating delivery
a3 Gas inlet
PEGASUS 67 LN 2S
760
100 180 41 42 32
1” 1/4
1” 1/4
3/4”
PEGASUS 77 LN 2S
850
110 200 43 44 34
1” 1/4
1” 1/4
3/4”
PEGASUS 87 LN 2S
930
110 200 40 41 31
1” 1/4
1” 1/4
3/4”
PEGASUS 97 LN 2S
1020 110 200 43 43 33
1” 1/4
1” 1/4
3/4”
PEGASUS 107 LN 2S 1100 120 220 40 40 30
1” 1/4
1” 1/4
3/4”
E
D
F
182
492
592
C
a2
a3
a1
A
970
760
B
1
2
3
4
5
6
7
8
10
13
22
11
12
20
19
18
17
16
15
14
14
PPEGASUS LN 2S
cod. 3540S242 - Rev. 03 - 04/2018
