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3. FOR THE USER
3.1 Commisioning
Warning
Installing and commissioning of this wa-
ter heater should only be carried out by
a qualified competent heating engineer.
3.1.1 Filling the water heater
1. Close the drain tap;
2. Open the cold water tap to the water
heater and open all taps where hot
water can be drained for de
aeration. The water heater is filled
as soon as cold water flows from all
taps;
3. Close all hot water taps.
3.1.2 Putting into operation
1. Check to see if the heater is filled
with water by running a little to
waste from a hot water tap
connected to the heater;
2. Check wether the ON/OFF switch is
in OFF-position;
3. Ensure gas supply is fully purged of
air and turn on gas cock;
4. Ensure that power has been
correctly supplied to the unit. Use a
voltage tester to check that the live is
to “L” and neutral to “N”. (Flame
detection is phase sensitive);
5. When first starting, the controller can
be in the lock out condition: depress
the reset button to free the control.
(After manual reset, an extended
prepurge/waiting time will occur);
6. Switch the ON/OFF switch into ON
position. If the pilot fails to ignite
within 25 seconds the controls will
go to lock out and the reset button
will need to be reset (wait 15
seconds before attempting reset). It
may be necessary to repeat the
lighting sequence a number of times
on the initial light up if all the air has
not been purged from the gas
supply;
7. The main burner pressure has been
factory set but should be checked
once normal operation is established
(see ‘Ratings’ for settings);
8. Set the temperature regulator to the
required setting (see ‘De-
scalcification’).
3.1.3 Use
The appliance is under water supply
pressure (maximum 8 bar). The amount
of cold water that is added is equal to
the amount of hot water used. The gas
control block automatically regulates the
gas supply. The main burner will ignite
as soon as a reduction in water
temperature is sended by the
thermostat. The main burner will shut
down as soon as the preset
temperature is achieved.
At high water temperatures there is
more scale buildup in the appliance. It is
for this reason that it is recommended
to place the temperature control knob in
position of 60 °C as the accumulation of
scale will be reduced.