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12
COMMISSIONING THE BOILER
12.1
First: flushing the boiler with water
After installation of the boiler the first step, before commissioning, is to flush the whole heating installation with fresh
water to remove pollution, debris and other materials that might cause a blocking with the
S-CB
+
isolated from the
system.
This must also be done with heating installations, where only the boiler is replaced.
12.2
Second: filling & venting the boiler and the system
After flushing the boiler and the installation the system can be filled with fresh water. Fill the boiler and the heating
system by using the appropriate filling valve. The water pressure of the system should be between a minimum of 1
bar and a maximum of 4 bar, also depending on the applied pressure safety valve - see chapter 6.14
‘Water pressure.’
NOTICE: Use the following aspects to prevent corrosion of the central heating system:
•
Filling water: do not use any additives for the water of the central heating system. The pH value of the water
should be more than 5. If the pH value is less please contact the supplier.
•
Ensure that any used “plastic” pipes are oxygen diffusion-proof in accordance with DIN 4726/4729. If not, make
sure that the boiler circuit is separated from the heating circuit by a plate heat exchanger. This way no oxygen
that entered the heating system through these pipes can reach the boiler.
•
Check the total heating system for any leaks. This to prevent oxygen entering the system through these leaks.
This boiler has an automatic air vent situated on top of the boiler (at the roof panel). This vent must be opened during
the filling of the boiler and the heating system to make sure that no air/oxygen is trapped in the heat exchanger of
the boiler. NOTICE: check that the screw cap has been loosened at least one twist. Shortly after putting the boiler
into operation, check the water pressure and add or lose some water to maintain the required pressure.
Make sure that no water can enter the boiler electrical parts.
12.3
Third: check the water flow
Before the boiler will be started it must be sure that the boiler pump is functioning and that there is a water flow over
the heat exchanger. Check the electrical power supply of the boiler and when this is connected correctly, the display
will show:
Display message
B o i
l e r
o f f
Reason
Boiler is not active. To activate the boiler press [ON/OFF] button for six seconds.
Display message
H E A T I N G : b o i
l e r
o f f
> > > : 1 2 3 . 4 ° C ( 1 2 3 . 4 ° C )
Reason
Boiler is in standby mode. To activate the boiler press [ON/OFF] button for three seconds.
Activate the boiler by pressing the ON/OFF button for six resp. three seconds. After this, the following display will
appear:
Display message
H E A T I N G : N o
d e m a n d
> > > : 1 2 3 . 4 ° C ( 1 2 3 . 4 ° C )
Reason
Boiler is active, but there is no heat demand.
When there is no water present in the boiler or the water pressure is too low/high, the boiler will go into lock-out and
will show a corresponding message in the display.
Display message
W a t e r p r e s s u r e
f a u l t
9 9 9 , 5
h r s
Reason
Water pressure is too low or too high.
