Service manual

Static
p
ressure monitorin
g
The boiler is in working mode when the system water pressure is between 0,5 and 3 bar.
With a water pressure between 0,5 and 0,2 bar, the burner is limited to low load.
If the water pressure is less than 0.2 bar, the regulation locks with a ‘P’ + ‘pressure’ on the display.
If the water
p
ressure is
g
reater than 3.0 bar, the re
g
ulation locks with a ‘P’ + ‘
p
ressure’ on the dis
p
la
y
.
3.1 Stand-by 3.2 Pre-rinse / pre-heat glowplug
(Fan off - Gas valve off - Glow plug off - Ionisation off) (Fan on - Gas valve off - Glow plug on - Ionisation off)
Heat demand:
Durin
g
the standb
y,
a check is made to see if there is Fan:
T
he fan switches over to the
p
ur
g
in
g
s
p
eed
(
1350 r
p
m
)
.
heat demand. If so the boiler will go over to pre-rise. Glow
p
lu
g
: The
g
low
p
lu
g
is switched on at full
p
ower.
Pum
p
test: After the
p
um
p
test
p
ro
g
ram is met, i
g
nition state starts.
3.3 I
g
nition 3.4 In operation
(Fan on - Gas valve on - Glow plug on/off - Ionisation off/on)
(
Fan on - Gas valve on - Glow
p
lu
g
off - Ionisation on
)
The ignition sequence of the burner is initiated. conditions burner on:
- when the room thermostat is closed (heat demand),
Fan:
The fan is runnin
g
at the i
g
nition s
p
eed
(
2900 r
p
m
)
. - and when the actual flow tem
p
erature is 5°C below the set
p
oint
,
Gas valve: The
g
as valve coil is activated and o
p
ens the safet
y
valves. - and after 3 minutes anti-c
y
clin
g
time
,
if a
pp
licable.
Glow
p
lu
g
: The
g
low
p
lu
g
i
g
nites the
g
as/air mixture from the burner.
Ionisation:
As soon as an ionisation si
g
nal is measured
,
the
g
low
p
lu
g
conditions burner off:
is switched off and the boiler will go over to in operation. - when the room thermostat is open (end of heat demand),
If there is no ionisation signal at the end of the safety time, a new - or when the actual flow temperature is 3°C above the set point,
start attempt is made.
- or when the actual flow tem
p
erature is 3°C above the
After four failed start attem
p
ts the boiler runs into lock-out.
3.5 Post-rinse 3.6 Pump afterrun (heating)
(Fan on - Gas valve off - Glow plug off - Ionisation off) (Fan off - Gas valve off - Glow plug off - Ionisation off)
Combustion chamber is being post-ventilated with air.
The pump continues to run over the heating circuit.
At end of heat demand the regulation runs into post-rinse. The time is adjustable (minimum of 1 minute with a maximum of
The fan runs at the last demanded s
p
eed for 20 seconds. CO=24 hours
)
.
Trouble shooting manual EN E000129004