Manual Dimplex LA 60TU (page 20 of 48) (English, German, French)

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EN-6 452163.66.23 · FD 9801 www.dimplex.de

English LA 60TU

6.2 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 system,

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. 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 performance

range (heat pump + boiler combination), flow temperatures 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 hard-

ness 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.

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 pro-

cedure for setting an overflow valve is described in the chapter

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

shot, the plate heat exchanger in the refrigeration circuit 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 ac-

count 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 10.) 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 whenever

the haet 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 in the event of a power failure. 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 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 LA 60TU Manual

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