26
Instructions for the installer
3.14 - FILLING THE SYSTEM
Warning!
Do not mix the CH system’s water with unsui-
table anti-freeze products (example: antifree-
ze solutions for motor vehicles) or use wrong
concentrations of anti-corrosion solutions!
This could cause damage to the washers
and could cause 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.
After completion of all the C.H. circuit connections fill the boiler
and proceed with the inspection for soundness of all the con-
nections, with the following procedure:
- open the radiator’s air vents
- gradually open the 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 reaches the
value of 1 bar (
this is valid only for installations equipped with
a closed expansion vessel - consult local regulations if this is
allowed); for installations equipped with an open expansion
vessel, the reinstatement is carried out automatically via the
same expansion vessel;
- close the system’s 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 for the first time and the system
has reached the correct temperature, stop the pump and
repeat the air bleeding operations.
- let the system cool down and, if necessary, re-establish the
water pressure to 1 bar (
this is valid only for installations
equipped with a closed expansion vessel - consult local re-
gulations if this is allowed) ); for installations equipped with
an open expansion vessel, the reinstatement is carried out
automatically via the same expansion vessel;
NOTE!
In closed heating circuits, where allowed, the water
pressure in the heating system - in cold conditions
– must not be lower than one 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.
NOTE!
If the boiler has not been fired for a long period the pump could
be jammed.
Before switching on the main switch, it
is important to carry out
the following un-jamming operation:
- 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 are no water leaks.
fig. 26
