59
5790 980 - 04
Vitoligno 300-C Installation/Service
Installation
Filling the Heating System
Legend
A
Precharged expansion tank (field supplied)
B
Automatic fill (field supplied)
CAUTION
To prevent equipment damage, install all pipework free
to load and torque stresses.
IMPORTANT
Apply sufficient amount of thread sealant when making
the connections.
1. Check the pre-charge pressure of the expansion vessel.
If the pre-charge pressure is lower than the static system
pressure, top up with nitrogen until the precharge
pressure is 0.1 to 0.2 bar (1.4 to 2.9 psi) higher than
the static system pressure.
If the pre-charge pressure is too high, adjust it accordingly.
2. Open the non-return valves.
3. Fill the heating system with water and vent until the
charge pressure is 0.1 to 0.2 bar (1.4 to 2.9 psi)
higher than the pre-charge pressure of the expansion
vessel.
Max. allowable working pressure (MAWP)..45 psi (3 bar)
4. Mark the charge pressure at pressure gauge
B
.
5. Reset the non-return valves to their operating position.
Legend
A
Pressure relief valve (PRV)
B
Temperature and pressure gauge
C
Air vent
D
Low water cutoff
WARNING
Exposing the boiler to pressures and temperatures in
excess of those listed will result in damages, and will
render warranty null and void.
