6 720 610 576 GB (02.05)
Commissioning
25
“ECO” button
By pressing and holding the “ECO” button
until the
display lights, you can switch between
Comfort mode
and
Economy mode
.
Comfort mode: button is not lit (factory setting)
The appliance is held constantly at the set temperature.
This means that hot water is available almost instanta-
neously at the tap. Consequently the appliance will
switch on at intervals, even if no hot water is being
drawn.
ECO mode with demand detection, button is lit
The demand detection function enables maximum gas
and water economy.
Briefly turning a hot water tap on and then off again sig-
nals demand to the appliance which then heats up the
water to the set temperature.
Hot water is thus available in about 1 minute.
ECO mode, button is lit
Water is not heated up until hot water is drawn. This
means that there is a longer waiting period before hot
water is available.
5.5.2
Hot water flow rate
The flow rate is factory set to 8 l/min.
Under standard conditions (2 bar) supply pressure, one
full turn is equivalent to approximately 2 l/min.
B
To increase the flow rate (max. 14 l/min):
turn screw on flow switch anti-clockwise (+).
The outlet temperature will decrease relative to the
increase in the flow rate.
B
To reduce the flow rate (min. 8 l/min):
turn screw on flow switch clockwise (–).
The outlet temperature will increase relative to the
decrease in the flow rate.
Fig. 33
5.6
Summer mode (hot water only)
With room thermostat
B
Turn temperature control
on the appliance anti-
clockwise as far as the stop.
The central heating is now turned off. The hot water
function and the mains power supply for the heating
programmer and timer remain switched on.
5.7
Frost protection
B
Leave master switch switched on.
If the appliance is to be left for long periods switch the
central heating off:
B
Add a suitable anti-freeze fluid to the water in the
central heating system.
Suitable products are available from Betz-Dearborn
Tel.: 0151 4209563 and Fernox Tel.: 01799
550811.
5.8
Pump anti-seize function
Every time the pump is switched off, a timer is started.
If after 24 hours the pump has not run again, it is
switched on for a period of 5 minutes.
5.9
Fault Condition
In the unlikely event of a fault occuring while the appli-
ance is in operation:
The display then shows a fault code and the button
-
may also flash.
If the button
flashes:
B
Press and hold the button
until the display shows
“
– –
”.
The appliance will then start up again and the display
will show the central heating flow temperature.
If the button
does not flash:
B
Switch the appliance off and then on again at the
master switch.
The appliance will start up again and the central heat-
ing flow temperature will be displayed.
Setting
Hot Water temperature
Turn fully anti-clockwise
approx. 40°C
approx. 55°C
Turn fully clockwise
approx. 60°C
Table 10
6720 610 332-25.1O
i
This function prevents the central heating
pump seizing after long periods of inactiv-
ity.
i
A list of faults that may occur is given on
page 43.
