Riello RS5D TL Installations-, Bedienungs- Und Wartungsanleitung Seite 33

FAULTS
Burner tends to pull the
flame when switching
st nd
from 1 to 2 stage.
T h e b u rn er lo cks o u t
a f t e r t h e p r e p u r g e
phase due to flame-fail-
ure.
T h e b u rn er lo cks o u t
d u r i n g t h e p r e p u r g e
phase.
The burner continues
to repeat the starting
cycle without going on
lock-out.
3087
POSSIBLE CAUSES
st
Output ratio between 1
greater than 1:2.
st
High air excess in 1 stage.
The solenoid valves is passing too lit-
tle gas.
The solenoid valves are defective.
The ignition arc is irregular or has
failed.
The pipe has not been purged from
the air.
The air pressure switch does not
change over to the operational posi-
tion.
The flame exists.
The pressure test point (9, fig. 9,
page 9) is badly positioned.
The gas pressure in the gas-mains
lies very close to the value to which
the gas pressure switch has been set.
The sudden falling-off pressure at the
opening of the valve causes the
opening of the pressure switch.
H o w e v e r t h i s o n l y t e m p o r a r i l y ,
because the valve immediately closes
again, so then does the pressure
switch, because the pressure builds-
up again, causing the cycle to be
repeated over and over.
Restore correct maximum ratio of 1:2,
nd
and 2 stage
making sure 1
than the operating range's
Restore the correct air excess value (
min. = 1.3) see section "4.4 combustion
control".
Check the pressure in the network and/
or adjust the solenoid valve according to
the instructions of this manual.
Change them.
Check the right insertion of the connectors.
Check the right position of the electrode
according to the instructions of this manual.
Carry out a complete breathing of the
line of gas-supply.
The pressure switch is faulty, change it.
The air pressure is too low, (the head is
bad adjusted).
Faulty valves: replace them.
Place it in the right position according to
the instructions on page 9, chapter 4.2.
Lower and set the pressure switch.
15 GB
SOLUTION
st
stage output is no less
minimum.
λ