Manual Dimplex LA60S TUR (page 9 of 24) (English)

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www.glendimplex.de 452163.66.79-EN · FD 0103 EN-7

LA 60S-TUR English

7.2 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,

residue from sealants, etc. Any accumulation of deposits in the

liquefier could cause the heat pump to completely break down.

Once the heat pump has been connected to the heating sys-

tem, it must be filled, de-aerated and pressure-tested.

Consideration must be given to the following when filling the

system:

Untreated filling water and make-up water must be of

drinking water quality (colourless, clear, free from sedi-

ments)

Filling water and make-up water must be pre-filtered (pore

size max. 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. 7.1: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:

For operation of the heat pump with the four-way reversing

valve, it is essential to set up the hydraulic connections accord-

ing to the instructions included in the scope of supply of the

valve. The instructions give a description of the precise proce-

dure for the correct assembly of hydraulics. Non-observance of

this will lead to restrictions in the operation of the heat pump.

Important:

The notes/settings in the instructions of the heat pump man-

ager must always be observed and carried out accordingly; not

doing so will lead to malfunctions.

Minimum heating water flow

The minimum heating water flow rate through the heat pump

must be assured in all operating states of the heating system.

This can be accomplished, for example, by installing either a

dual differential pressureless manifold or an overflow valve. The

procedure for setting an overflow valve is described in the

chapter "Start-up". When the minimum heating water flow rate

is undershot, the plate heat exchanger in the refrigeration cir-

cuit can freeze, which can lead to total loss of the heat pump.

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 11.) must be guaranteed in every operating status. An in-

stalled 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.

Antifreeze

Heat pump systems, which cannot be guaranteed to be frost-

free, should be equipped with a drainage option (see Fig.). The

antifreeze function of the heat pump manager is active when-

ever the heat pump manager and the heat circulating pump are

ready for operation. When decommissioning the heat pump, or

in the event of a power failure, the system must be drained

through the indicated points (see illustration); it may be neces-

sary to purge the system with compressed air.. The heating cir-

cuit should be operated with a suitable antifreeze if heat pump

systems are implemented in buildings where a power failure

cannot be detected (holiday home).

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 LA60S TUR Manual

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