for the technician
HEATING SYSTEM
— Verify that the hydraulic pressure measured after the reduction valve is not greater than the
maximum hydraulic pressure indicated on the appliance data plate.
— Considering that during boiler operation, the water inside the heating system increases its
pressure, make sure that its maximum value does not exceed the maximum hydraulic pressure
indicated on the technical data.
— Connect the boiler’s safety valves outlets to an evacuation funnel. If safety valves are not
connected to an evacuation device, their intervention could flood the room. Hermann cannot be
held responsible for any damage arising from that situation.
Make sure that the hydraulic and heating systems ducts are not used as earth
connections of the electrical system. They are absolutely NOT SUITABLE for such a
use.
System filling
In case of installation of the boiler in areas where the room temperature can decrease under
0° C, we suggest to fill the heating system with an anti freezing liquid and to execute the filling
of the tank in a second time, in the process of first ignition of the boiler.
Once all system connections have been carried out, proceed with filling of the water heater tank
and of the heating system. This operation should be made with caution, respecting the following
steps:
1) Tank filling:
• open a hot water tap;
• slowly open the boiler’s cold water inlet tap
(ref. figure beside);
• when only water flows out of the hot water
tap, close it.
2) Heating system filling (with water):
• open the radiators venting devices;
• gradually open the heating system filling tap
(ref. figure beside), checking the correct
functioning of automatic venting devices,
eventually installed;
• close the radiators venting devices as soon
as water flows;
• Make sure that pressure gauge reaches the optimal value of 1÷1.5 bar (minimum: 0.5
bar);
• close the water supply valve and bleed each radiator.
BOILER BOTTOM VIEW
HEATING SYSTEM
FILLING TAP
COLD WATER
INLET TAP
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