PEGASUS LN 2S
33
EN
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
A
Version
PEGASUS 80 - 125 LN 2S
B
Version
PEGASUS 160 - 250 LN 2S
5.2 General view and main components
fig. 13 - General view and main components
A
Version
PEGASUS 80 - 125 LN 2S
B
Version
PEGASUS 160 - 250 LN 2S
Key
1
"0 - 1 - TEST" switch
2
2-stage control thermostat
3
2nd stage electronic controller reset button
4
1st stage electronic controller reset button
5
Thermohydrometer
6
Plug
7
Safety thermostat
8
Prearrangement for fitting an electronic controller
9
Fume point on fume chamber
12
Gas pressure switch
13
Pilot burner complete with electrodes
14
Gas manifold
15
Pressure point
16
Drain cock
17
Gas valve with elect. controller 1st stage
17A
1st stage gas valve
18
Gas valve with elect. controller 2nd stage
18A
1st stage gas valve
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 the 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 to the ignition and ionisation electrodes.
The electrodes are not discharging in
the ignition phase.
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 to the ignition and ionisation electrodes.
Check the connections to the electronic flame controller.
Make sure the LINE -NEUTRAL are not inverted and that the earth contacts are effi-
cient.
Check the inlet gas pressure and any open gas 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
combustion.
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 temperature
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 the water to system too
high or too low
Check correct operation of the 2-stage control thermostat.
Make sure the heating 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 too great a temperature differ-
ence
Make sure the bulb is properly inserted in the sheath.
Check correct operation of the 2-stage thermostat.
The boiler produces condensation
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 goes out for no apparent
reason
Safety thermostat activation due to an overtemperature.
A
B
F
B
A
C
E
D
a1
a2
a3
1050
672
567
222
Type and model
A
B
C
D
E
F
a1
heating
return
a2
heating
delivery
a3
Gas
inlet
PEGASUS 119 LN 2S
930 133 220 50 42 1050
2”
2”
1”
PEGASUS 136 LN 2S
1020 148 250 53 45 1050
2”
2”
1”
PEGASUS 153 LN 2S
1100 148 250 58 43 1050
2”
2”
1” 1/2
PEGASUS 170 LN 2S
1190 173 300 60 46 1050
2”
2”
1” 1/2
PEGASUS 187 LN 2S
1270 173 300 58 44 1050
2”
2”
1” 1/2
PEGASUS 221 LN 2S
1440 173 300 57 45 1050
2”
2”
1” 1/2
PEGASUS 255 LN 2S
1610 198 350 62 46 1100
2”
2”
1” 1/2
PEGASUS 289 LN 2S
1780 198 350 66 49 1100
2”
2”
1” 1/2
15
15
13
14
16
17
9
8
7
5 4 6 3 2
1
12
18
13
17
17A
18
18A
A
B
cod. 3540T612 - Rev. 01 - 02/2015
