Unical AIREX 2S Series User Manual

26
Instructions for the installer
3.14 - FILLING THE SYSTEM
Warning!
Do not mix the CH system’s water with
unsuitable anti-freeze products (example:
antifreeze
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 completing all the system’s service connections the
circuits may be filled by carefully following out the following
phases:
- 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 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, arrest 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
regulations 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 circuit heating systems, 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 system is cold.
Use the pressure gauge, installed near the filling cock, to read
the system’s pressure.
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 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.
fig. 26

Unical AIREX 2S Series Specifications

General

Brand	Unical
Model	AIREX 2S Series
Category	Boiler
Language	English