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HPL 6S-TU(R)W
The following points must be observed when filling the system:
Untreated filling water and make-up water must be of drink-
ing water quality
(colourless, clear, free of sediments)
Filling water and make-up water must be pre-filtered (max.
pore size 5 µm).
Scale formation in domestic hot water heating systems cannot be
avoided, but in systems with flow temperatures below 60 °C, the
problem can be disregarded. With high-temperature heat pumps
and in particular with bivalent systems in the higher performance
range (heat pump + boiler combination), flow temperatures of
60 °C and more can be achieved. The following standard values
should therefore be adhered to with regard to the filling and
make-up water according to VDI 2035, sheet 1: The total hard-
ness values can be found in the table.
Total alkaline
Total heat
earths in mol/m³
output in kW
and/or mmol/l
2.0
< 50
2.0
50 - 200
1.5
200 - 600
> 600
< 0.02
1. This value lies outside the permissible value for heat exchangers in heat
pumps.
Fig. 7.1:Guideline values for filling and make-up water in accordance with
VDI 2035
For systems with an above-average specific system volume of
50 l/kW, VDI 2035 recommends using fully demineralized water
and a pH stabiliser to minimize the risk of corrosion in the heat
pump and the heating system.
ATTENTION!
With fully demineralized water, it is important to ensure that the minimum
permissible pH value of 7.5 (minimum permissible value for copper) is
complied with. Failure to comply with this value can result in the heat
pump being destroyed.
NOTE
The notes/settings in the instructions of the heat pump manager must
always be observed and carried out accordingly; not doing so will lead to
malfunctions.
www.gdts.one
Specific system volume
(VDI 2035) in l/kW
20 < 50
50
< 20
Total hardness in °dH
16.8
11.2
11.2
8.4
< 0.11
8.4
1
< 0.11
1
< 0.11
452163.66.68 · FD 9908
Minimum heating water flow rate
The minimum heating water flow rate through the heat pump
must be assured in all operating states of the heating system. If
the minimum heating water flow rate is not reached, the heat
pump is blocked.
The nominal flow rate is specified depending on the max. flow
temperature in the device information and must be taken into ac-
count during planning. For return temperatures under 30 °C, the
flow must be designed for the nominal conditions.
The specified nominal flow rate (See "Device information" on
page 14) must be guaranteed in every operating status. An in-
stalled flow rate monitoring sensor is used only for switching off
the heat pump in the event of an unusual and abrupt drop below
the minimum heating water flow rate and not for monitoring and
safeguarding the nominal flow rate.
Frost protection
On heat pump systems where protection from frost cannot be
guaranteed, there must be an option for draining the system (see
figure). The frost protection function of the heat pump manager is
active whenever the heat pump manager and the heat circulating
1
pump are ready for operation. If the heat pump is taken out of
service or in the event of a power failure, the system has to be
drained. If heat pump systems are implemented in buildings
where a power failure cannot be detected (holiday homes etc.),
the heating circuit should be operated with suitable frost protec-
tion.
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