Manual Dimplex SI 70TUR (page 29 of 72) (English, German, French)

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www.glendimplex.de 452237.66.55 · FD 0007 EN-9

SI 50 - 70 TUR English

7.3 Connection on heating side

CAUTION!

The heating system must be flushed prior to connecting the

heat pump.

Before completing the heat pump connections on the heating

water side, the heating installation must be flushed in order to

remove any impurities that may be present, as well as residues

of sealing material, and the like. Any accumulation of deposits

in the condenser may result in a total failure of the heat pump.

CAUTION!

The maximum test pressure in the heating circuit and the

brine circuit is 6.0 bar. This value must not be exceeded.

Once the installation on the heating side has been completed,

the heating system 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 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 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. 7.8: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.

Use of the optionally available four-way reversing valve is rec-

ommended. A detailed installation description can be found in

the instructions included with the valve.

Heating water minimum 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 a dual dif-

ferential pressureless manifold.

Provided the heat pump manager and heating circulating

pumps are ready for operation, the frost protection feature of

the heat pump manager is active. If the heat pump is taken out

of service or in the event of a power failure, the system has to be

drained. In heat pump installations where a power failure can-

not be readily detected (holiday house), the heating circuit must

contain a suitable antifreeze product.

7.4 Connection on heat source side

The following procedure must be observed when making the

connection:

Connect the brine pipe to the heat source flow and return of the

heat pump.

The hydraulic integration diagram must be adhered to.

CAUTION!

The supplied strainer must be fitted in the heat source inlet of

the heat pump in order to protect the evaporator against the

ingress of impurities.

CAUTION!

It is recommended that the brine circuit side be equipped with

the flow rate switch available as an option.

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

The brine concentration must be at least 25 %. Freeze protec-

tion down to approx. -14 °C can thus be ensured.

Only antifreeze products on the basis of mono-ethylene glycol

or propylene glycol may be used.

The heat source system must be vented (de-aerated) and

checked for leaks.

CAUTION!

The brine solution must contain at least 25 % of an antifreeze

agent on a mono-ethylene glycol or propylene glycol basis

and must be mixed prior to filling.

NOTE

ºººº

A suitable de-aerator (micro bubble air separator) must be

installed in the heat source circuit by the customer.

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 SI 70TUR Manual

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