Central Heating Function - Worcester GREENSTAR 25CDi GC Instruction Manual

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POWER BLUE
SWITCH
f...,.
LIGHT
r- ­
ON ON
Room
thermostat and/or
mains
programmer ON
(or link fitted at
Sfl0)
AND
t-- ­
Facia mounted
programmer (if
fitted) ON
AND
CH control knob
ON
3 minute wait
,
Fan to
CENTRAL
HEATING start
rJI"
DEMAND
Diverter valve
in CH position
Pump ON.
f--Jo ­
speed.
Gas valve OFF.
Fan overrun
30 seconds
Over temperature
shut-down if water
temperature is 6°C
above set value.
I
IGNITION
SEQUENCE
~
(see detail)
I
GREEN
FLAME
1--­
LIGHT
ON
10 second
stabilisation
~
period.
IGNITION SEQUENCE
YES
Spark
BURNER
ignition
-
LIT?
4 seconds
t
r .... n
LOCKOUT
.--------,. YES
NO
5th
attempt?
NO
Stop spark.
Wait
10 seconds
set
temperature
(36~88°C)
Fan (& gas)
modulation
to achieve
i--J­
END OF
BOILER
DEMAND
Gas valve
OFF
Pump run 3
minutes
Fan run 30
seconds
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