Bedienungsanleitung Dimplex LAW 9IMR (Seite 33 von 100) (Deutsch, Englisch, Französisch)

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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

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

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.

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