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6
Assembly
6.1 General
The following connections need to be established on the heat
pump:
- Flow and return of the heating system
- Communication line (heat pump manager)
- Control voltage line (heat pump manager)
- Supply voltage line (electrical distribution system)
- Condensate drain
6.2 Connection on heating side
The heating system connections on the heat pump have a 1 1/
4" external thread. A spanner must be used to firmly grip the
transitions when connecting the heat pump.
CAUTION!
Fault on the safety switching equipment of the hydraulic
circuit intended for pressure limitation. Risk of injury!
The safety switching equipment of the hydraulic circuit
intended for pressure limitation must be checked for
proper
installation
commissioning.
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 rate can be shut off
via the radiator or thermostat valves, an overflow valve must be
installed by the customer in a heating bypass downstream from
the heat 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.
NOTE
Pump units with check valves maintain the specified flow
direction. 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 is
mandatory in the event of several heating circuits or parallel
connections for heat pumps in order to avoid incorrect
distribution.
EN-8
and
functionality
before
452170.66.02-EN · FD 0305
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
LA 1422C
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