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www.glendimplex.de 452168.66.05a · FD 0104 EN-7
HPL 9S-TU(R)W - HPL 18S-TU(R)W English
7.2 Connection on heating side
The heating system connections on the heat pump are to be
made inside the device. Refer to the device information for the
connection sizes. The connection hoses are routed out of the
device in a downwards direction. A Wellflex hose set is available
as an accessory for this. Side openings in the frame also enable
lines to be routed at the side. A spanner must be used to firmly
grip the transitions when connecting the heat pump.
Before connecting the heating water system to the heat pump,
the heating system must be flushed to remove any impurities,
residue from sealants, etc. Any accumulation of deposits in the
liquefier may cause the heat pump to completely break down.
Once the heat pump has been connected to the heating sys-
tem, it must be filled, purged and pressure-tested.
The following points must be observed when filling the system:
Untreated filling water and make-up water must be of
drinking 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 per-
formance range (heat pump + boiler combination), flow tem-
peratures 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 hardness values can be found in the table.
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.
CAUTION!
!
!
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
º
ºººº
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.
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
account 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 moni-
toring 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 pump are ready for operation. When decom-
missioning the heat pump, or in the event of a power failure, the
system must be drained through the indicated points (see illus-
tration); it may be necessary to purge the system with com-
pressed air. 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 pro-
tection.
Total heat
output in kW
Total alkaline earths
in mol/m³ and/or
mmol/l
Specific system volume
(VDI 2035) in l/kW
< 20 20 < 50 50
Total hardness in °dH
< 50 2.0 16.8 11.2
< 0.111
50 - 200 2.0 11.2 8.4
200 - 600 1.5 8.4 < 0.111
> 600 < 0.02 < 0.111
1. This value lies outside the permissible value for heat exchangers in heat
pumps.
2
1
3
… 31 …

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