Assembly; General; Connection On The Heating Side; Water Quality In Heating Systems - Dimplex La 35Tbs Montage- Und Gebrauchsanweisungen

LA 35TBS
6

Assembly

6.1 General

The following connections need to be established on the heat
pump:
Heating system flows and returns

Condensate drain

Communication line

 Control voltage line
 Supply voltage line

6.2 Connection on the 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 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.
For systems in which the heating water flow can be turned off
using radiator and/or thermostat valves, an overflow valve must
be installed by the customer in a heating bypass upstream from
the heating pump. This ensures a minimum heating water flow
rate through the heat pump and helps to avoid faults.
Once the heat pump has been connected to the heating sys-
tem, it must be filled, purged and pressure-tested. The installed
dirt trap must be checked for soiling at regular intervals (approx.
every 6 months) and cleaned if necessary.
NOTE
Pump units with check valves maintain the specified flow
directions. If there is incorrect distribution or breaking off of
the volume flow, these units (and the check valves in
particular) must be checked! The use of check valves are
mandatory in the event of several heating circuits or parallel
connections for heat pumps in order to avoid incorrect
distribution.
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6.3 Water Quality in Heating
Systems
6.3.1 Scale Formation
Scale formation in heating systems cannot be avoided, but in
systems with flow temperatures below 60 °C the problem is so
small that it is negligible. With high-temperature heat pumps
and in particular with bivalent systems in the higher perfor-
mance range (heat pump + boiler combination), flow tempera-
tures of 60 °C and more can be achieved. One preferred
method for preventing scale formation is softening because
this permanently removes alkaline earths (calcium and magne-
sium ions) from the heating system.
The following values for water quality in heating water and cold
water must be observed and checked during an on-site check:
Degree of hardness

Conductivity

pH value

Filterable materials

The following (limit) values must absolutely be observed:
Maximum degree of hardness in filling water and supple-

mentary water 11 dGH.
The conductivity in demineralised water (DM water) (low-

salt) may not be greater than 100 μS/cm.
 The conductivity in partially demineralised water (saline)
may not be greater than 500 μS/cm.
The pH value must be between 8.2 and 9.

 The limit value for filterable materials in heating water is <
30 mg/l
If necessary, for example in bivalent systems, the specifications
listed in the table below must also be observed, or the precise
guidelines for filling water and supplementary water and the
total hardness must be taken from the table in accordance with
VDI 2035 – Sheet 1.
NOTE
The specific volumes of a heating system must be determined
before filling the system.
The saturation index SI is used to determine whether water has
a tendency towards lime dissolution or lime separation. This
shows whether the pH value corresponds to a neutral pH point
or by how much it undershoots it due to excess acid or by how
much it exceeds it due to carbonic acid deficit. At a saturation
index below 0, the water is aggressive and will tend towards
corrosion. At a saturation index above 0, the water is calcare-
ous.
The saturation index SI should be between - 0.2 < 0 < 0.2
452166.66.11e · FD 0503
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