6 720 610 597 GB (03.02)
50
Appendix
10.7 Operational Flow diagrams
10.7.1 Domestic hot water function
Fig. 63
Mains
switch
ON.
Green
light
ON.
Burner lights.
Red light ON.
Ignition spark for
5 seconds.
Fan runs to purge
gas from burner.
Repeats 5 times
before lock-out.
Hot
water
demand.
Pump ON
Diverter valve
operates.
Heat input
modulates to
maintain the
delivery
temperature.
Gas valve
closes.
Red light
OFF.
Fan runs for
upto 3 mins.
Pump runs
for 30secs.
Over temperature
shut-down if water
temperature is 8°C
above set value.
Burner remains OFF
until flow temperature
is below set value.
Gas valve shuts.
Pump remains ON.
Demand
ends.
Yes
No
** NOTE:
The 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 instantaneous combination
boiler.
b) Demand Detection: a short demand (less
than 5 seconds) switches the control to
“Comfort“ mode for 5 mins. Mini pre-heat.
The Factory setting is “
Comfort
“ mode.
Fan to
start speed.
Gas valve opens.
Pre-heat
mode.**
Ignition sequence
Pre-heat
mode.**
Burner shut-down if
primary temperature
exceeds 94 °C remains
OFF until 78 °C
Pump ON
Diverter valve
operates.
Fan to
start speed.
Gas valve opens.
Pre-heat satisfied.
Ignition sequence
Burner lights.
Red light ON.
Ignition
spark
5 secs
.
6 720 610 576 - 24.1O
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