Bedienungsanleitung Dimplex SI 7ME (Seite 20 von 56) (Deutsch, Englisch, Französisch)

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SI 5ME - SI 14ME

7.2 Heating System Connection

ATTENTION!

Flush the heating system prior to 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.

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 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. 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.

The sensors which are delivered already connected and loosely

placed in the switch box must be mounted and insulated accord-

ing to the hydraulic integration diagram.

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 sys-

tem. This can be accomplished, for example, by installing either

a dual differential pressureless manifold or an overflow valve.

The procedure for adjusting an overflow valve is described in the

Chapter Start-Up.

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.

The antifreeze function of the heat pump manager is active

whenever the controller and the heat circulating pumps 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 heat-

ing circuit should be operated with a suitable antifreeze if heat

pump systems are implemented in buildings where a power fail-

ure can not be detected (holiday home).

7.3 Heat Source Connection

The following procedure must be observed when connecting the

heat source:

Connect the brine pipe to the heat pump flow and return. The hy-

draulic integration diagram must be adhered to.

ATTENTION!

The supplied dirt trap must be inserted in the heat source inlet of the heat

pump to protect the evaporator against the ingress of impurities.

In addition, a micro bubble air separator must be installed in the

heat source system.

The brine liquid must be produced prior to charging the system.

The liquid must have an antifreeze concentration of at least 25 %

to ensure frost protection down to -14 °C.

Only monoethylene glycol or propylene glycol-based antifreeze

may be used.

The heat source system must be de-aerated and checked for

leaks.

ATTENTION!

The brine solution must contain at least a 25 % concentration of a

monoethylene glycol or propylene glycol-based antifreeze, which must

be mixed before filling.

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 (R2) installed (NTC-10)

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

Flow temperature primary circuit (R6) 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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