3087
15 GB
Burner tends to pull the
flame when switching
from 1
st
to 2
nd
stage
.
Output ratio between 1
st
and 2
nd
stage
greater than 1:2.
Restore correct maximum ratio of 1:2,
making sure 1
st
stage output is no less
than the operating range's minimum
.
High air excess in 1
st
stage.
Restore the correct air excess value (
λ
min. = 1.3) see section “4.4 combustion
control”.
T h e b u r n e r l o c k s 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.
The solenoid valves is passing too lit-
tle gas.
Check the pressure in the network and/
or adjust the solenoid valve according to
the instructions of this manual.
The solenoid valves are defective.
Change them.
The ignition arc is irregular or has
failed.
Check the right insertion of the connectors.
Check the right position of the electrode
according to the instructions of this manual.
The pipe has not been purged from
the air.
Carry out a complete breathing of the
line of gas-supply.
T h e b u r n e r l o c k s o u t
d u r i n g t h e p r e p u r g e
phase.
The air pressure switch does not
change over to the operational posi-
tion.
The pressure switch is faulty, change it.
The air pressure is too low, (the head is
bad adjusted).
The flame exists.
Faulty valves: replace them.
The pressure test point (9, fig. 9,
page 9) is badly positioned.
Place it in the right position according to
the instructions on page 9, chapter 4.2.
The burner continues
to re pe at the s ta rting
cycle without going on
lock-out.
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.
Lower and set the pressure switch.
FAULTS
POSSIBLE CAUSES
SOLUTION
Содержание 20052615
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