Manual Dimplex LI 20TES (page 28 of 76) (English, German, French)

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English LI 20TES - LI 28TES

7.3 Heating System Connection

The heating system connections on the heat pump have a 1 ¼"

external thread. 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

liquifier could cause the heat pump to completely break down.

For systems in which the heating water flow can be shut off via

the radiator or thermostat valves, an overflow valve must be in-

stalled in a heating bypass behind the heat pump by the cus-

tomer. This ensures a minimum heating water flow rate through

the heat pump and helps to avoid faults.

Once the heating system has been installed, 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.

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 rate

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 13.) 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.

NOTE

The use of an overflow valve is only recommended for panel

heating and a max. heating water flow of 1.3 m³/h. System

faults may result if this is not observed.

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. If the heat pump is taken out of service or

in the event of a power failure, the system has to be drained.

The heating circuit should be operated with a suitable anti-

freeze if heat pump systems are implemented in buildings

where a power failure can not be detected (holiday home).

7.4 Temperature sensor

The following temperature sensors are already installed or must

be installed additionally:

External temperature sensor (R1) supplied (NTC-2)

Return temperature sensor (R2) installed (NTC-10)

Flow temperature sensor (R9) installed (NTC-10)

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 LI 20TES Manual

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