Preheat And Dhw Function - Bosch Worcester GREENSTAR CDi Series Instruction Manual

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POWER BLUE
SWITCH
.....
LIGHT
ON ON
L.,
Tap open
(recognised
by flow
turbine)
ECO button
not
illuminated •
(ie preheat
requested)
AND
20 minutes
since last pre-
heat demand
AND
temperature
at least 1 o·
below set
point.
·set
by
pressing ECO
button. If pro-
grammer is
fitted this is
set by a com-
bination of
programmer
(DHW)
demand and
ECO button.
Wait
-
5 seconds
DOMESTIC
HOT
WATER ....
DEMAND
-
(priority over
all other
demands)
Diverter valve
inDHW
~
position
Pump ON.
PREHEAT
~
-
DEMAND
....-----------.,YES
LOCKOUT
Burner shut down if
primary temperature
~
g5•c
Diverter valve opens
toCH
Over temperature
Gas valve OFF.
shut-down if water
temperature is 1 o·c
~
above set value.
Fan (&gas)
modulation
to achieve
set
temperature
(4o-5o •c)
GREEN
Fan to
IGNITION
FLAME
.....
SEQUENCE
___..
start
LIGHT
speed.
(see detail)
ON
IGNITION SEQUENCE
Fan (&gas)
modulation
to achieve
(40-60 •c)
YES
___...,
BURNER
_____..
4 seconds
NO
5th
attempt?
LIT?
NO
Stop spark.
Wait
10 seconds
.....
~
DEMAND
END
~
Gas valve
OFF
Pump run 3
minutes
Fan run 30
seconds
DEMAND
END
~
Gas valve
OFF
Stop pump
Stop fan
"U
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