Heating System Connection - Dimplex LIK 8TES Installation And Operating Instructions Manual

LIK 8TES

7.3 Heating System Connection

To enable connection to the heating system, flexible hose con-
nection pieces and double nipples with a 1" external thread are
included with the heat pump. These allow the optional use of a
threaded or flat gasket connection to the heating system.
If the heat pump is not intended to be used to heat up the hot wa-
ter, the hot water output must be permanently sealed using the
supplied sealing plug.
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
liquifier could cause the heat pump to completely break down.
An overflow valve is installed in the device for systems in which
the heating water flow can be shut off via the radiator or thermo-
stat valves. This ensures a minimum heating water flow rate
through the heat pump and helps to avoid faults.
Once the heating system has been installed, 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 com-
pletely 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
The integrated expansion vessel has a volume of 24 litres. This
volume is suitable for buildings with a living space area to be
heated of maximum 200 m².
The volume should be checked by the heating system engineer.
If necessary, an additional expansion vessel must be installed
(according to DIN 4751, Part 1). The tables listed in the manufac-
turers' catalogues simplify dimensioning the system on the basis
of the water content. Allow for a buffer tank volume of 55 litres
when making the calculation.
ATTENTION!
In the case of large-volume heating circuits, an additional expansion
vessel must be used to supplement the installed expansion vessel (24
litres, 1.0 bar admission pressure).
EN-8
Total
hardness in °dH

2.0 11.2

1.5 8.4
< 0.11
452161.66.01 · FD 9203
Antifreeze
A method of manual drainage (see illustration) should be pro-
vided for heat pumps which are exposed to frost. The antifreeze
function of the heat pump manager is active whenever the man-
ager and the heat circulating pumps 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. The heating circuit should
be operated with a suitable antifreeze if heat pump systems are
implemented in buildings where a power failure can not be de-
tected (holiday home).
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