Manual Dimplex LAK 14IMR (page 33 of 100) (English, German, French)

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www.glendimplex.de 452162.66.09a · FD 0108 EN-7

LAK 3IMR - LAK 14ITR English

5.3 Heating system connection

The heating system connections on the indoor unit have a 1"

flat sealing external thread. A spanner must be used to firmly

grip the transitions when making the connections.

There is a hose sleeve on the safety valve for on-site connection

of a plastic hose. This should be fed into a siphon or outflow.

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 6 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. 5.1: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.

CAUTION!

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.

NOTE

ºººº

If the unit is connected to an existing hydraulic water circuit,

the hydraulic pipes must be cleaned to remove residues and

limescale.

The heating circuit must include a corresponding purging facil-

ity, a fill and drain valve and a dirt trap on-site.

It is also recommended to install a shut-off device in the return

before integration into the indoor unit is carried out.

Minimum heating water flow rate

The minimum heating water flow rate must be ensured in all op-

erating states of the heating system with at least 50 l (buffer

tank with individual room control or underfloor heating system

with 50 l minimum volume in open heating circuits). When the

minimum heating water flow rate is undershot, the plate heat

exchanger in the refrigeration circuit can freeze, which can lead

to total loss of the heat pump.

NOTE

ºººº

The installation of a flow rate switch (DFS LAK or VSH LAK) is

absolutely necessary to ensure water flow before compressor

start and during defrosting.

The nominal flow rate is specified depending on the max. flow

temperature in the device information and must be taken into

account during planning. With design temperatures below

30 °C in the flow, the design must be based on the max. volume

flow with 5 K spread for A7/W35.

The specified nominal flow rate (See “Device information” on

page 18.) must be assured in all operating states. An installed

flow rate switch is used only for switching off the heat pump in

the event of an unusual and abrupt drop in the heating water

flow rate and not to monitor and safeguard the nominal flow

rate.

Frost protection

A method of manual drainage must be provided for heat pump

internal components which are exposed to frost. The frost pro-

tection function of the heat pump manager is active whenever

the heat pump manager and the heat circulating pump are

ready for operation. The system has to be drained if the heat

pump is taken out of service or if a power failure occurs. The hy-

draulic network should be operated with suitable frost protec-

tion if heat pump systems are implemented in buildings where

a power failure cannot be detected (vacation homes etc.).

NOTE

ººººº

Chemical treatment to protect from rust should be carried out

by the installer.

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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Dimplex LAK 14IMR Manual

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