Preheat And Dhw Function - Worcester GREENSTAR 25CDi GC Instruction Manual

---
C
Burner shut down If
primary temperature
95"C
i-IIf
Diverter valve opens
toCH
Over temperature
Wait
shut-down If water
Gas valve OFF.
r-­
5 seconds
temperature is 10·C
r.
above set value.
DOMESTIC
HOT
Tap open
WATER
(recognised
DEMAND
....
Fan
(&
gas)
modulation
to achieve
set
temperature
(4Q-eO°C)
GREEN
FLAME
LIGHT
ON
Fan (& gas)
IGNITION SEQUENCE
~
YES
BURNER
r------- ­
LIT?
NO
Stop spark.
Wait
10 seconds
'"0
;0
m
:r:
m
~
»
z
o
o
:r:
~
-n
Z
Q
o
z
z
j\!
~
~
~
*
Z
"l
'"
9
~
()
'"
~
'"
()
rn
:!.l
rn
'"
~
I
GO
;0
g:j
Z
j\!
'"
OJ
~
g ~
92
R
'" 0
~ ~
~ ~
0> "
~ ~
I~
'I
...
POWER
SWITCH
i-J..
ON
BLUE
LIGHT
ON
~
by flow
turbine)
ECO button
not
Illuminated •
(ie preheat
requested)
AND
20 minutes
since last pre­
heat demand
AND
temperature
at least 100
below set
point
'Set by
pressing ECO
button.
If pro ­
grammerls
fitted this is
set by a com ­
bination
of
programmer
(DHW)
demand and
ECO button.
(priority over
all other
demands)
PREHEAT
f-Joo
DEMAND
-
Diverter valve
inDHW
position
Pump ON.
I - - ­
f-...,
, - - - - -...... , YES
LOCKOUT
IGNITION
Fan to
SE~UENCE
r+
start
~
(see detail)
speed.
---JIoo ­
4 seconds
NO
5th
attempt?
modulation
to achieve
(4Q-aO°C)
DEMAND
END
~
Gas valve
OFF
Pump run 3
minutes
Fan run 30
seconds
END
rD~
~
Gas valve
OFF
Stop pump
Stop fan
'1J
:::u
m
I
m
~
» z
C1
C1
I
"
~
c:
z
~
o
z