Vaillant ECOTEC PLUS VU 80 Installation And Maintenance Instructions Manual page 10

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2 Safety
3,6
3,3
3
80 kW
2,7
2,4
2,1
1,8
1,5
1,2
0,9
0,6
0,3
0,0
0
2.1 Water preparation depending on water hardness and system
volume
Key:
x System volume [l]
y Water hardness [mol/m
3
(1 mol/m corresponds to 100 mg/l CaCO
A Water treatment required
B Water treatment not required
2.4.6 Expansion relief valve
The boiler is supplied with a 6 bar presure relief valve,
which must be fitted to the boiler and drained to a safe but
visible location. The safety discharge pipe must be a mini-
mum of 18 mm diameter and must be solely used for this
purpose.
Ensure that all components that are fitted in the heating
installation are suitable for a max. operating pressure of
6 bar.
2.4.7 Purging
The boiler is equipped with an automatic air vent. Other
measures need to be taken to allow the heating system to
be purged during filling and during commissioning either
manually or using an automatic air vent.
Risk of damage due to frost
Insufficient frost protection measures may cause frost dam-
age to the heating installation
> Explain to the operator how to protect the heating instal-
lation against frost.
10
100/120 kW
A
80 kW: A
100/120 kW: B
B
500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
3
]
)
3
x [l]
ecoTEC plus installation and maintenance instructions 0020134823_01
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