User manual

Page 33
PREPARATION FOR COMMISSIONING THE BOILER
First: Flushing the boiler with water
After installation of the boiler the first step, before commissioning, is to power flush the whole heating installation
with fresh water to remove pollution, debris and other materials that might cause a blocking. Do not flush dirt into
the Boiler rinse the Boiler with clean water after the system is fully cleaned. This must also be done with heating
installations even where only one boiler is replaced.
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 wa-
ter pressure of the system should be between a minimum of 1 bar and a maximum of 4 bar ( 6 Bar possible) also
depending on the pressure safety valve used.
REMINDER: Use the following aspects to prevent corrosion of the central heating system:
Filling water: Do not use any unapproved additives for the water of the central heating system.
Use Sentinel X100 (only) additive to the water for the central heating.
The pH value should be between 8.and 9.5 (if not, we suggest you contact Strebel). Test the water.
Use additive as required. Hardness should be 5 to15 degree F (French)
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.
The boiler has an automatic air vent situated on top of the boiler (At the top panel) Casing. 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. REMINDER: 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 re-
quired pressure.
During this proceedings make sure that no water can enter the boiler and make contact with the electrical parts of
the boiler.
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 5 seconds.
Display message H E A T I N G : b o i l e r o f f
> > > : 1 2 3 . 4
o
C ( 1 2 3 . 4
o
C )
Reason Boiler is not active. To activate the boiler press [ON/OFF] button for 5 seconds.