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6 Start-up
22 Installation instructions aroTHERM 0020147164_04
Increase the operating pressure in the heat pump heat-
ing circuit.
Operating pressure: 0.15 … 0.2 MPa (1.50
… 2.0 bar)
Note
The pressure level may fall in the first month
following start-up. It may also vary depending
on the outside temperature.
Conditions: If you are using glycol
The glycol must not escape into the outflow or the envir-
onment.
Prepare a mixture with suitable glycol (max. 50% ethyl-
ene glycol) in order to protect the heat pump against
frost according to the regional minimum temperatures.
Note
If no frost protection has been poured in, the
product will not be protected in the event of a
power cut when there is frost.
Use a frost protection tester to ensure the correct
dosage.
6.7 Preparing the heating water
Caution.
Risk of material damage if the heating
water is treated with unsuitable frost and
corrosion protection agents.
Frost and corrosion protection agents may
cause changes in the seals, noises during
heating and may lead to further damage.
Do not use any unsuitable frost and corro-
sion protection agents.
Mixing additives with the heating water may result in material
damage. However, no incompatibility with Vaillant units has
been detected with proper use of the following products over
a long period.
When using additives, follow the manufacturer's instruc-
tions without exception.
Note
Vaillant accepts no liability for the compatibility
of any additive or its effectiveness in the rest
of the heating installation.
Additives for cleaning measures (subsequent
flushing required)
Fernox F3
Sentinel X 300
Sentinel X 400
Additives intended to remain permanently in the
system
Fernox F1
Fernox F2
Sentinel X 100
Sentinel X 200
Additives for frost protection intended to remain
permanently in the system
Fernox HP 15 or HP15c
Sentinel X 500
Inform the operator about the measures required if you
have used these additives.
Inform the operator about the measures required for frost
protection.
Permissible water hardness
Note
Contact the local water supply company for further
information on water quality.
Observe all applicable national regulations and technical
standards when treating the filling and supplementary
water.
Provided the national regulations and technical standards
do not stipulate more stringent requirements, the following
applies:
You must treat the heating water in the following cases:
If the entire filling and supplementary water volume dur-
ing the operating life of the system exceeds three times
the nominal volume of the heating installation,
If the limit values shown in the following tables are not
observed.
Total heating
output
Total hardness at smallest boiler heating
surface
1)
20 l/kW
> 20 l/kW
< 50 l/kW
> 50 l/kW
kW
mol/m³ (mg/l
CaCO)
mol/m³ (mg/l
CaCO)
mol/m³ (mg/l
CaCO)
< 50
No require-
ment
2 (200) 0,02 (2,0)
< 3
2)
(300
2)
)
> 50 to 200 2 (200) 1,5 (150) 0,02 (2,0)
1) Of the specific system volume (nominal capacity in
litres/heating output; on systems with more than one boiler, the
lowest individual heating output must be set). These values only
apply up to three times the system volume for filling and supple-
mentary water. If three times the system volume is exceeded,
the water must be treated in accordance with the specifications
from the VDI (softening, desalting, hardness stabilisation or
blowing down). This is exactly the same as if the limit values in
the table were exceeded
2) On systems with circulation water heaters and for systems
with electric heating elements
Permissible salt content
Heating water char-
acteristics
Unit Low-salt Saline
Electrical conductivity
at 25 °C
μS/cm < 100 100 … 1,500
Appearance
Free of sedimentary materi-
als
pH value at 25 °C
8,2 … 10,0
1)
8,2 … 10,0
1)
22


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