45
Tec
hnical f
eatures and dimensions
3.14 - FILLING THE SYSTEM
NOTE
Before filling the system, check the preload of the
expansion vessel which must be 1.5 bar, and adjust
it if the pressure is any less.
In systems equipped with a closed expansion
vessel, the water pressure in the heating system -
with the system cold - must not drop below 1 bar;
open the filling tap when the pressure is too low.
This operation must be performed with a cooled
system.
The pressure gauge fitted on the system allows
you to read the circuit pressure.
Attention!
Do not mix the heating water with incorrect
concentrations of antifreeze or anti-corrosion
substances! This could damage the gaskets
and cause noise during operation.
Unical will not be held liable for damage to
persons, animals or objects due to failure to
comply with the instruction above.
After making all the hydraulic connections, fill
the boiler and check the soundness of all the
connections.
This operation must be performed carefully, re-
specting the following phases:
- open the bleeder valves of the radiators, radiant
batteries and/or distribution manifolds;
- open the system filling tap gradually, making
sure that the automatic air release valves in-
stalled on the system work properly;
- close the bleeder valves of the radiators, radiant
batteries and/or distribution manifolds as soon
as water comes out;
- check the pressure gauge until the pressure
reaches approximately 1 bar.
- close the system filling tap and bleed air once
again through the bleeder valves of the ra-
diators, radiant batteries and/or distribution
manifolds;
- make sure that all the connections are water-
tight;
- after commissioning the boiler and bringing the
system to the operating temperature, stop the
pumps and repeat the air bleed operations;
- let the system cool off and, if necessary, return
the water pressure to 1 bar.
Summary of Contents for NOVAIREX 35
Page 1: ...INSTALLATION AND MAINTENANCE INSTRUCTIONS NOVAIREX 35 45 55 ...
Page 55: ......
