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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 de-
vice in a downwards direction. An optional pipe kit is available as
an accessory, which can be used to lead the connections out to
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 system,
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 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
completely avoided, but in systems with flow temperatures below
60 °C, the problem can be disregarded.
With medium and high-temperature heating systems, tempera-
tures above 60 °C can be reached.
The following standard values should therefore be adhered to re-
garding the filling and make-up water according to VDI 2035,
sheet 1:
Total alkaline earths
Total heat
in mol/m³ and/or
output in [kW]
mmol/l
up to 200
200 to 600
> 600
< 0.02
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.dimplex.de
Total
hardness in °dH
2.0
11.2
1.5
8.4
< 0.11
452168.66.01 · FD 9512
LA 9S-TU(R) - LA 18S-TU(R)
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.
This can be accomplished, for example, by installing either a dual
differential pressureless manifoldeiner or an overflow valve. The
procedure for setting an overflow valve is described in the chap-
ter "Commissioning". 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.
NOTE
The use of an overflow valve is only recommended for panel heating and
a maximum heating water flow of 1.3 m³/h. System faults may result if this
is not observed.
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. 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.
EN-7
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