a thermostatic THREE-WAY LOAD VALVE to protect the boiler from condensation as
shown below (one advice for this item, Regulus TCV3B with 55
o
C activation temperature)
We recommend a buffer storage tank capacity of 25 to 50 litres per kW boiler output. For
correct sizing of expansion tank, refer to calculations supplied by the manufacturer.
NOTICE
–
Safety of heating circuit
•
Install a ½” safety valve with a maximum relief pressure of 3 bars.
•
Install a manometer to follow and check water pressure in the system. When water is
cold, system pressure should be set at 1
–
1,5 bars.
CAUTION
For new installations
•
System should be sized and designed accordingly, in order to minimize fresh water
addition. Make sure that no part of the system is made of material that is permeable
to gases. The original system filling water and any topping-up water must always be
filtered (using synthetic or metal mesh filters with a filtration rating of no less than
50 microns) to prevent sludge from forming and triggering deposit induced
corrosion. Minimum water pressure in a pressurized heating circuit must always be
kept above atmospheric pressure
For a new boiler installed on an old heating circuit
•
In old systems used for a long time, a protective coating (black magnetite) has been
built on all metal surfaces contact with water. This coating protects the system
agains further corrosion. When new boiler is installed in old system, new parts with
metal surfaces, particularly boiler surfaces will inevitably become sacrificial anode
for entire heating system, in other words, they come in the first place where
corrosion starts. That is why, following precautions should be added to above, for a
new boiler in an old system:
•
If the old system has an open expension tank, this may be converted to
pressurized system with all necessary safety measures.
•
The old system must be fully washed up from all substitutes and particules
contained on the surfaces.
•
Air separator with manual vent should be installed at the heighest level of circuit.
WARNING
–
Risk of corrision on boiler and circuit
