User manual

BOILER FUNCTION
NO
YES
POWER
SWITCH
ON
BOILER
DEMAND
Fan to
start
speed.
Diverter valve
in CH position
Pump ON.
IGNITION
SEQUENCE
(see detail)
BLUE
LIGHT
ON
BURNER
LIT?
GREEN
FLAME
LIGHT
ON
Stop spark.
Wait
10 seconds
5th
attempt?
LOCKOUT
10 second
stabilisation
period.
Fan (& gas)
modulation
to achieve
set
temperature
(40-82°C)
END OF
BOILER
DEMAND
Gas valve
OFF
Pump run 3
minutes
Fan run 30
seconds
Over temperature shut-
down if water tempera-
ture is 5°C above set
value.
Gas valve OFF.
Fan overrun
30 seconds
3 minute wait
Spark
ignition
4 seconds
NO
YES
BOILER FUNCTION
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i System/24i System
8 716 107 375b (11/05)
56
FAULT FIN DING
& DIAGRAMS
System demand
at ST10
AND
temperature
control knob
ON
IGNITION SEQUENCE
IMPORTANT: IF THE OPTIONAL
INTEGRAL DIVERTER VALVE HAS
BEEN FITTED
Disregard this page and refer to the
correct versions for CENTRAL HEATING
and DHW FUNCTIONS in the ADDITIONAL
INFORMATION section at the back of this
book.