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Instructions for the installer
3.13 - FILLING THE SYSTEM
Warning!
Do not mix the CH system’s water with un-
suitable anti-freeze products (example: anti-
freeze solutions for motor vehicles) or use
wrong concentrations of anti-corrosion so-
lutions ! This could cause damage to the
washers and could provoke noise during
normal boiler operation.
UNICAL refuses all liability for injury to per-
sons, animals or damage to property deri-
ving from not having respected the above
mentioned recommendations.
After completing all the system’s service connections the cir-
cuits may be filled by carefully following out the following pha-
ses:
- open the radiator’s air vents and check that the automatic
air vent in the boiler is working properly.
- gradually open the appropriate filling cock and check that
the automatic air vents fitted onto the system are working
properly.
- close the radiator’s air vents as soon as water begins to
flow out.
- using the pressure gauge check that the pressure rea-
ches the value of 0,8/1 bar.
- close the filling cock and then bleed off the air once again
through the radiator’s air vents.
- check all the connections for soundness.
- after having fired the boiler and the system has reached
the correct temperature, arrest the pump and repeat the
air bleeding operations.
- let the system cool down and, if necessary, re-establish
the water pressure to 0,8/1 bar.
Filing system cock
NOTE!
The minimum low water pressure switch will not
give the electrical impulse to fire the burner if the
pressure is lower then 0,4 bar.
The pressure of the water in the CH system must
not be lower then 0,8/1 bar; if this value is lower
use the filling cock on the boiler to adjust the
pressure.
This operation must be carried out when the sy-
stem is cold. Use the pressure gauge fitted on
the boiler to read the system’s pressure value.
NOTE!
If the boiler has not been fired for a long period
the pump could be jammed. Before firing the boi-
ler, it is important to carry out the following un-
jamming operation:
- place a cloth underneath the pump
- remove the pump vent plug positioned in the
centre of the pump
- using a screwdriver, rotate the shaft in a
clockwise direction.
Once this operation has been concluded, screw
back the pump vent plug and check that there
have been no water leaks.
WARNING!
After removing the pump vent plug some slight
water leakage could occur. Before replacing
the front panel dry all the wet surfaces.
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