6 Start-up
22
Installation instructions aroTHERM 0020147164_07
▶
To purge the heating circuit, open the heating circuit's
purging valve
(1)
by a 1/4 rotation
(B)
using an open-end
spanner.
▶
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.
1
3
5
6
4
2
1
Drain hose
2
Heating flow
3
Stop valve
4
Water/glycol supply
5
Heating return
6
Collecting container
▶
Close the stop cock in the heating flow.
▶
Fill the heating circuit via the heating return.
◁
Air collects at the purging valve.
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
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 system, 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 system.
▶
Use a magnetic rod to check whether it contains mag-
netite (iron oxide).
▶
If you ascertain that it contains magnetite, clean the sys-
tem and apply suitable corrosion-protection measures, or
fit a magnet filter.
▶
Check the pH value of the removed water at 25 °C.
▶
If the value is below 8.2 or above 10.0, clean the system
and treat the heating water.
▶
Ensure that oxygen cannot get into the heating water.
Checking the filling and supplementary water
▶
Before filling the system, measure the hardness of the
filling and supplementary water.
Treating the filling and supplementary water
▶
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 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
≤
50 l/kW
> 50 l/kW
kW
ppm
CaCO
₃
mol/
m
³
ppm
CaCO
₃
mol/
m
³
ppm
CaCO
₃
mol/
m
³
< 50
< 300
< 3
200
2
2
0.02
> 50
to
≤
200
200
2
150
1.5
2
0.02
> 200
to
≤
600
150
1.5
2
0.02
2
0.02
> 600
2
0.02
2
0.02
2
0.02
1) Nominal capacity in litres/heating output; in the case of multi-
boiler systems, the smallest single heating output is to be used.
