INSTALLATION
9
4.2.
Return temperature protection
For the correct function of the boiler and for protection against corrosion it is very important to
ensure steady temperature at the return of the boiler of at least 55
o
C.
This can be ensured by installing a recirculation pump between the boiler outlet and return (see
connection diagrams).
An alternative variation is by installing at the return of the boiler a three-way thermostatic valve.
Having a return temperature less than 55
o
C is very dangerous for the boiler long-
life and can cause warranty loss!
4.3.
Filling the system
After completing all the hydraulic connections, the circuit may be filled with water. After filling
the system, open the radiators air valves to get rid of the air in the installation.
Verify that the installation pressure is according to the technical features of the boiler. A
manometer should be installed on the cold water inlet to verify the cold pressure, at the lowest
point of the installation, at a point close to the boiler.
The whole installation must remain under nominal pressure for at least 10 minutes. During this
period, check that all the connections are tight and there are no water leakages. Make sure that
during this period no pressure drop appears.
After firing the boiler, make sure the network functions properly at working temperature and
pressure.
The hardness of the mains water supply affects the boiler’s life span. It is
recommended to use a water softener if water hardness exceeds 15
o
f.
Do not fill the system at the working pressure! When the boiler will be heated,
the water pressure will raise. Filling pressure must be at least 1 bar lower than
working pressure!
4.4.
Electrical connections
The electrical connection is performed by the given cable. Plug the one end at the IEC plug at
the back of the boiler, and the other end to a 230V plug. The plug where the boiler will be
connected must have grounding, and must be ensured that has tension in nominal parameters.
The plug on the boiler is protected with an incorporated electrical fuse and has a general electrical
switch ON/OFF.
Make sure that the electric cable is not in contact with hot parts of the boiler or the chimney,
and is not crushed by heavy parts.
THERMOSTAHL ROMANIA SRL declines any liability for damage caused to
people, animals and goods, due to defects caused by faulty electrical
connections or lack of connecting the boiler to an efficient grounding system.
