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2.3.3 PRESSURIZED EXPANSION VESSEL
CONTENT Unit 095 125 155 157 175 177 195 197 257 307
Volume L
4 6 8
Max. operating
pressure (water)
Bar
5 4 4
Pre-charge
pressure (air)
Bar
0.5 0.75 0.75
Maintenance:
• Before maintenance or control, make sure that:
-the system is off, cooled and not pressurized,
-power supply is off,
-vessel is empty.
• Every 6 months, expansion vessel is verified by checking
pre-charge pressure.
• Expansion vessel must be changed by a new one in case
of excessive deterioration and, anyway, at the latest
5 years later from the installation date.
2.3.4 SAFETY RELIEF VALVE
Setting: 3 Bar
Maintenance:
• Checking:
Every year, safety valve must be checked by turning
the red knob, so that the medium is discharged, thus cleaning
the seal seat.
• Leaks:
If the valve leaks, with the medium flowing out constantly
or dripping, it should be checked by a qualified technician and
replaced if necessary.
Pre-charge valve
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