6 720 611 400 GB (03.11)
48
Appendix
10.7 Operational Flow diagrams
10.7.1 Domestic hot water function
Fig. 63
6 720 610 576 - 25.TD
Repeats 5 times
(N.G.) or 3 times
(L.P.G.) before
lock-out.
Yes
No
Pump ON
Diverter valve
operates.
Fan to start
speed.Gas
valve opens.
Ignition sequence
Ignition
spark
5 secs
Pre-heat satisfied.
Burner lights.
Red light ON.
Burner shut-down if
primary temperature
exceeds 94°C remains
OFF until 78°C
Burner remains OFF
until flow
temperature is below
set value.
Gas valve shuts.
Pump remains ON.
Over temperature
shut down if water
temperature is 8°C
above set value.
** 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.
Mains
switch
ON.
Green
light
ON.
Pre-heat
mode.**
Hot
water
demand.
Pump ON
Diverter valve
operates.
Fan to start
speed. Gas valve
opens.
Heat input
modulates to
maintain the
delivery
temperature.
Demand
ends.
Gas valve
closes. Red
light OFF.
Fan runs for
up to 3 mins.
Pump runs for
30secs.
Pre-heat
mode.**
Ignition sequence
Ignition
spark
5 secs
Burner lights.
Red light ON.
Fan runs to purge
gas from burner.
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