Fault Finding - Sime RMG 70 Mk.II Manual De Instrucciones

of the burners to remove any dust. Make
sure that there are no scales on the top
drilled part of the burners (fig. 13).
– Remove any scales from the bottom of
the boiler and replace the items that
were removed, checking the position of
the gaskets.
– Check the chimney to make sure that
the flue is clean.
– Check operation of the equipment and
the main burner.
– After assembly of all the gas connec-
tions, these must be tested for sound-
ness, using soapy water or appropriate
products. DO NOT USE NAKED FLAMES.
Preventive maintenance and checking of
efficient operation of equipment and
safety devices must be carried out exclu-
sively by authorized technical personnel.
KEY
1 Boiler body
2 Burner
3 Main nozzle
4 Aluminium washer
5 Burner manifold
4.7

FAULT FINDING

The main burner does not ignite.
– This means that the flue smoke stat has
tripped off (point 3.3).
– Make sure power arrives to the gas
valve.
– Replace the electric operator of the
valve.
– Replace the valve.
The boiler reaches the set temperature,
but the radiators do not heat up.
– Make sure there are no air bubbles in the
system, if so purge from appropriate air
vents.
– The room stat is too low or must be
replaced if faulty.
– The connections of the room stat are not
correct (make sure the cables are placed
on terminals 6 and 7 of the boiler termi-
nal board).
Boiler operates only at nominal pressure
and does not reduce pressure.
– Check whether there is voltage at both
ends of coil.
– The coil has a break in the winding; replace.
– The rectifier card that supplies the coil is
interrupted; replace.
– There is no differential on setting of the
two contacts of the regulating thermo-
stat; replace.
– Check calibration of reduced pressure
Fig. 13
adjusting screw of coil assembly.
The boiler gets dirty easily causing scaling
of cast iron exchanger and cutting off of
smoke stat.
– Check that the flame of the main burner
is well regulated and that gas consump-
tion is proportional to boiler output.
– Poor ventilation of premises where boiler
is installed.
– Flue with insufficient draught or not mee-
ting requirements.
– The boiler works at too low temperatu-
res. Adjust the boiler thermostat to
higher temperatures.
Thermostat switches boiler back on with
too high temperature difference.
– Replace regulating thermostat since it is
out of calibration.
IT
ES
PT
GB
57