6 720 611 400 GB (03.11)
48
Appendix
10.7
Operational Flow diagrams
10.7.1 Domestic hot water function
Fig. 63
6 7
20 6
1
0 5
7
6 - 25.TD
Repeats 5 times
(N
.G
.) or 3 times
(L
.P
.G
.) before
loc
k-out
.
Ye
s
No
Pump O
N
Diverter valve
operates
.
Fan to s
ta
rt
speed
.Gas
valve opens
.
Ignition sequence
Ignition
spark
5 secs
Pre-heat s
a
tisfied
.
Burner lights
.
Red light O
N
.
Burner shut-down if
primar
y temperature
exceeds 94°C remains
O
F
F
until 7
8°C
Burner remains O
F
F
until flow
temperature i
s
b
e
lo
w
set value
.
Gas valve shuts
.
Pump remains O
N
.
Over temperature
shut down if water
temperature is 8°C
above set value
.
** N
O
TE
:
T
he appliance controls can be set to one of 2
modes of operation
.
1.
“
Comfort
“ mode -
Full pre-heat
2.
“
ECO
“ mode -
a
) Operates as an inst
antaneous combination
boiler
.
b
) Demand Detection
: a short demand (
less than 5
seconds
) switc
hes the control to “C
omfort“ mode
for 5 mins
. Mini pre-heat
. T
he Factor
y setting is
“
Comfort
“ mode
.
Mains
switc
h
ON.
Green
light
ON.
Pre-heat
mode
.**
Hot
water
demand
.
Pump O
N
Diverter valve
operates
.
Fan to s
ta
rt
speed
. Gas valve
opens
.
Heat input
modulates to
maint
ain the
deliver
y
temperature
.
Demand
ends
.
Gas valve
closes
. Red
light O
F
F
.
Fan runs for
up to 3 mins
.
Pump runs f
o
r
3
0
secs
.
Pre-heat
mode
.**
Ignition sequence
Ignition
spark
5 secs
Burner lights
.
Red light O
N
.
Fan runs to purge
gas from burner
.