Assembly; General; Connection On Heating Side - Dimplex LA 17TU Installation And Operating Instructions Manual

LA 17TU - LA 40TU
6

Assembly

6.1 General

The following connections need to be established on the heat
pump:
 Heating system flows and returns
 Condensate outflow
 Control line to the heat pump manager
 Power supply

6.2 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. Route the connection hoses out of the device
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.
Use a spanner 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, re-
sidue from sealants, etc. Any accumulation of deposits in the li-
quefier could cause the heat pump to completely break down.
ATTENTION!
The dirt trap included in the scope of supply is to be installed in the heat
return before the heat pump.
Cleaning and maintenance instructions can be found in the dirt
trap's installation and operating instructions.
Once the heat pump has been connected to the heating system,
it must be filled, de-aerated and pressure-tested.
Consideration must be given to the following when filling the sys-
tem:
 Untreated filling water and make-up water must be of drink-
ing water quality (colourless, clear, free from sediments)
 Filling water and make-up water must be pre-filtered (pore
size max. 5µm).
Scale formation in hot water heating systems cannot be comple-
tely avoided, but in systems with flow temperatures below 60°C
the problem can be disregarded.
With medium and high-temperature heat pumps, temperatures
above 60°C can be reached.
The following standard values should therefore be adhered to
concerning the filling water 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
EN-6
Total
hardness in °dH

2.0 11.2

1.5 8.4
< 0.11
452163.66.10 · FD 9309
Minimum heating water flow
The minimum heating water flow rate through the heat pump
must be assured in all operating states of the heating sys-
tem. This can be accomplished, for example, by installing a dual
differential pressureless manifold. When the minimum flow rate
is undershot, the plate steel exchanger in the refrigerating cycle
can freeze, which can lead to total loss of the heat pump.
NOTE
The use of an overflow valve is only recommended for panel heating and
a max. heating water flow of 1.3 m³/h. System faults may result if this is
not observed.
Antifreeze
Heat pump systems, which cannot be guaranteed to be frostfree,
should be equipped with a drainage option (see Fig.). The anti-
freeze function of the heat pump manager is active whenever the
manager and the heat circulating pump are ready for operation.
The system has to be drained if the heat pump is taken out of ser-
vice or in the event of a power failure. The heating circuit should
be operated with a suitable antifreeze if heat pump systems are
implemented in buildings where a power failure cannot be detec-
ted (holiday home).
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