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Dimplex LAW 9IMR Manual

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www.gdts.one 452162.66.04 · FD 9912 EN-7
LAW 9IMR - LAW 14ITR English
6 Indoor unit installation
6.1 General
The following connections need to be established on the indoor
unit:
Flow / return of the heating system
Safety valve outflow
Power supply
Domestic hot water pipe
Circulation pipe (optional)
Cold water pipe
Voltage supply
Split refrigerant pipe
NOTE
º
When removing the unit cover, it must be taken into account
that the length of the connecting cable between the control
panel in the unit cover and the controller on the contact plate
is only 1.5 m. If the device cover can only be placed further
away than this when it has been removed, the plug
connection on the controller or on the control panel must first
be disconnected.
6.2 Heating system connection
The heating system connections on the indoor unit have a 1 1/
4" flat sealing external thread. A spanner must be used to firmly
grip the transitions when making the connections.
A ¾" dimensionally stable plastic hose (external diameter ap-
prox. 19 mm) (in the area behind the split pipe connections)
leads from the safety valve to the outside. This hose must be
fed into a syphon or drain with the extension required at the
site.
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 sys-
tem, 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
drinking 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 avoided, but in systems with flow temperatures below 60 °C,
the problem can be disregarded. With high-temperature heat
pumps and in particular with bivalent systems in the higher per-
formance range (heat pump + boiler combination), flow tem-
peratures of 60 °C and more can be achieved. The following
standard values should therefore be adhered to with regard to
the filling and make-up water according to VDI 2035, sheet 1:
The total hardness values can be found in the table.
Fig. 6.1:Guideline values for filling and make-up water in accordance with
VDI 2035
For systems with an above-average specific system volume of
50 l/kW, VDI 2035 recommends using fully demineralized
water and a pH stabiliser to minimize the risk of corrosion in the
heat pump and the heating system.
ATTENTION!
!!
With fully demineralized water, it is important to ensure that
the minimum permissible pH value of 7.5 (minimum
permissible value for copper) is complied with. Failure to
comply with this value can result in the heat pump being
destroyed.
The buffer tank and heating system must be filled via the filling
and drain cock on the indoor unit. The cylinder must be purged
using the air-relief cock on the upper pipe connection to the
cylinder.
When fully purging the indoor unit, the 3-way mixer valve must
be set manually to the "middle position" (reset once purging is
complete).
NOTE
º
If the unit is connected to an existing hydraulic water circuit,
the hydraulic pipes must be cleaned to remove residues and
limescale.
A suitable purging facility must also be installed in the heating
circuit on site.
Total heat
output in kW
Total alkaline earths
in mol/m³ and/or
mmol/l
Specific system volume
(VDI 2035) in l/kW
< 20 20 < 50 50
Total hardness in °dH
< 50 2.0 16.8 11.2
< 0.111
50 - 200 2.0 11.2 8.4
200 - 600 1.5 8.4 < 0.111
> 600 < 0.02 < 0.111
1. This value lies outside the permissible value for heat exchangers in heat
pumps.
… 33 …


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