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Instructions for the installer
3.22 - FILLING THE SYSTEM
Warning!
Do not mix the CH system’s water with anti-
freeze or anti-corrosion solutions using wrong
concentrations! It could cause damage to the
washers and could provoke noise during
normal boiler operation.
UNICAL refuses all liability for injury to persons,
animals or damage to property deriving from
not having respected the above mentioned
recommendations.
Once all the connections are made, it is possible to fill the
circuit.
This operation has to be performed very carefully, by obser-
ving the following steps (boiler in Off position):
- open the radiator bleeds and make ascertain the good
operation of the automatic air vent fitted in the boiler .
- open progressively the filling valve and make sure the
automatic air vent, in the system, work properly.
- close the bleeders of the radiators when water starts to
come out.
- control via the manometer (bargraph) that the water
pressure has reached a minimum value of 0.8/1 bar.
- close the filling valve and bleed again all the radiators.
- inspect for the soundness all the hydraulic connec-
tions.
- after the commissioning of the boiler and the reaching
of the normal operation temperature, switch off the operation
of the boiler and the pump and repeate the bleed operation.
- let the installation cool down and, if necessary, add
water in order to reach the minimum presure of 0.8/1 bar.
EXAMPLE OF FILLING-UP SYSTEM MANIFOLD
Filling group
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