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PEGASUS 67 ÷ 107 2S
Fume sensor (fume thermostat) safety device
The boiler is equipped with a fume evacuation control device (fume sensor - ref. 4 of
fig. 1). In case of anomalies in the fume exhaust system with consequent return of burnt
gases in the room, the unit shuts down. The antiwind grille is equipped with a tempera-
ture sensor bulb for detecting and controlling the fume temperature.
Any leaks of burnt gases into the room cause an increase in the temperature detected
by the bulb, which causes the boiler to turn off within 2 minutes, shutting off the gas to
the burner. If the fume sensor cuts in, unscrew the protection cover (ref. 4 of fig. 1) locat-
ed on the control panel and manually reset the device. The boiler will resume operation.
If the sensor has to be replaced due to a fault, only use original accessories and ensure
that the electrical connections and positioning of the bulb are correctly carried out.
B
The fume sensor must not be cut out for any reason!
Opening the front casing
To open the front panel of the boiler, refer to the sequence in fig. 5.
fig. 5 - Front panel opening
B
Before carrying out any operation inside the boiler, disconnect the electrical
power supply and close the gas cock upstream.
Combustion analysis
A fume sampling point has been included inside the boiler, in the top part of the anti-
backflow device (see fig. 6).
To take the sample:
1.
Remove the boiler top panel
2.
Remove the insulation placed over the anti-backflow device
3.
Open the fume sampling point;
4.
Insert the probe;
5.
Adjust the boiler temperature to max.
6.
Wait 10-15 minutes for the boiler to stabilise*
7.
Take the measurement.
fig. 6 - Combustion analysis
A
Analyses made with an unstabilised boiler can cause measurement errors.
Burner assembly removal and cleaning
To remove the burner assembly:
•
Disconnect the power supply and turn off the gas ahead of the boiler.
•
Undo the two screws securing the electronic flame controllers to the gas valve
(fig. 7) and remove them from the gas valves (fig. 8).
•
For models 97 2S and 107 2S with 2 gas valves, also undo the 2 screws securing
the 2 electrical connectors that feed the second valve and remove them.
•
Disconnect the ignition and ionisation cables from the electrode assembly.
•
Undo the nut fixing the gas supply pipe ahead of the gas valve (fig. 9). For models
97 2S and 107 2S, undo the 2 nuts.
•
Undo the two nuts fixing the combustion chamber door to the cast iron elements of
the boiler (fig. 10).
•
Remove the burner assembly and combustion chamber door.
Check and clean the burners. Only use a non-metallic brush or compressed air to clean
the burners; never use chemical products.
On completion, refit everything in reverse order.
cod. 3540S433 - Rev. 02 - 04/2018
fig. 7 - Undo the control unit screws
fig. 8 - Remove the control unit
fig. 9 - Undo the gas valve nut
fig. 10 - Undo the combustion chamber door nuts
EN
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