Handleiding Dimplex LI 16I-TUR (pagina 32 van 72) (Duits, Engels, Frans)

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English LI 16I-TUR

7.3 Heating System Connection

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

ternal thread. Use a spanner to firmly grip the transitions when

connecting the heat pump.

The connection on the heating side can also be made towards

the right. To do this, the left and right bottom front panels must

be removed. The two connecting pipes, including pipe sup-

ports, must be moved from the left to the right side of the de-

vice. The front panels must then be re-mounted the opposite

way around.

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.

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.

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 16.) 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

ººººº

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

A method of manual drainage (see illustration) should be pro-

vided for heat pumps which are exposed to frost. The antifreeze

function of the heat pump manager is active whenever the heat

pump manager and the heat circulating pump are ready for op-

eration. 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 cir-

cuit 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).

7.4 Temperature sensor

Depending on the heat pump type used, the following temper-

ature sensors are already installed or must be additionally

mounted:

Outside temperature (R1)

Temperature 1st, 2nd and 3rd heating circuit (R2, R5 and

R13)

Flow temperature (R9), as a frost protection sensor in the

case of air-to-water heat pumps

Outlet temperature of the heat source in the case of brine-

to-water and water-to-water heat pumps

Domestic hot water temperature (R3)

Temperature of renewable thermal storage (R13)

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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