18
Installation and maintenance instructions 0020213394_05
Note
Vaillant recommends that you install the
Vaillant heat pump brine filling unit (not re-
quired when installing the ground water
module). By doing this, it is then possible
to carry out a preparatory partial bleed of the
brine circuit, e.g. for the flow and return of
the brine circuit up to the product.
6.4
Hydraulic wiring in the system
6.4.1
Installing heating circuits with direct
connection
1.
Install the hydraulic components in accordance with
the local requirements as shown in the basic system
diagram example (
→
Installation instructions for the
system).
2.
Connect the underfloor heating circuits or heating man-
ifolds directly to the heat pump.
3.
Connect a limit thermostat to ensure that the heat
pump's underfloor protection works correctly.
(
4.
Ensure that a minimum circulation water volume is
guaranteed.
–
Minimum circulation water volume: 35% of the
nominal volume flow
6.4.2
Installing heating circuits with direct
connection and domestic hot water cylinder
1.
Install the heating circuits for direct operation.
(
2.
Secure the cylinder temperature sensor, which is avail-
able from the range of accessories, in the domestic hot
water cylinder and connect it to the heat pump.
7
Filling and purging the installation
7.1
Filling and purging the heating circuit
7.1.1
Checking and treating the heating
water/filling and supplementary water
Caution.
Risk of material damage due to poor-qual-
ity heating water
▶
Ensure that the heating water is of suffi-
cient quality.
▶
Before filling or topping up the installation, check the
quality of the heating water.
Checking the quality of the heating water
▶
Remove a little water from the heating circuit.
▶
Check the appearance of the heating water.
▶
If you ascertain that it contains sedimentary materials,
you must desludge the installation.
▶
Use a magnetic rod to check whether it contains mag-
netite (iron oxide).
▶
If you ascertain that it contains magnetite, clean the in-
stallation and apply suitable corrosion-inhibition meas-
ures (e.g. fit a magnetite separator).
▶
Check the pH value of the removed water at 25 °C.
▶
If the value is below 8.2 or above 10.0, clean the installa-
tion and treat the heating water.
▶
Ensure that oxygen cannot get into the heating water.
Checking the filling and supplementary water
▶
Before filling the installation, measure the hardness of the
filling and supplementary water.
Treating the filling and supplementary water
▶
Observe all applicable national regulations and technical
rules when treating the filling and supplementary water.
Provided the national regulations and technical rules do not
stipulate more stringent requirements, the following applies:
You must treat the filling and supplementary water in the
following cases
–
If the entire filling and supplementary water quantity dur-
ing the operating life of the system exceeds three times
the nominal volume of the heating installation, or
–
If the guideline values listed in the following table are not
met, or
–
If the pH value of the heating water is less than 8.2 or
more than 10.0.
Total
heating
output
Water hardness at specific system volume
1)
≤
20 l/kW
> 20 l/kW
≤
40 l/kW
> 40 /kW
kW
ppm
CaCO
₃
mol/
m
³
ppm
CaCO
₃
mol/
m
³
ppm
CaCO
₃
mol/
m
³
< 50
< 300
< 3
150
≤
1.5
5
0.05
> 50
to
≤
200
200
< 2
150
≤
1.5
5
0.05
> 200
to
≤
600
150
< 1.5
5
0.05
5
0.05
> 600
5
0.05
5
0.05
5
0.05
1) Nominal capacity in litres/heat output; in the case of multi-
boiler systems, the smallest single heat output is to be used.
Caution.
Risk of material damage if the heating
water is treated with unsuitable additives.
Unsuitable additives may cause changes in
the components, noises in heating mode and
possibly subsequent damage.
▶
Do not use any unsuitable antifreeze and
corrosion inhibitors, biocides or sealants.
No incompatibility with our products has been detected to
date with proper use of the following additives.
▶
When using additives, follow the manufacturer's instruc-
tions without exception.
We accept no liability for the compatibility of any additive or
its effectiveness in the rest of the heating system.
Additives for cleaning measures (subsequent
flushing required)
–
Adey MC3+
–
Adey MC5
–
Fernox F3
–
Sentinel X 300
–
Sentinel X 400
