Manual Dimplex SI 14TU (page 25 of 76) (English, German, French)

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www.glendimplex.de 452235.66.22a · FD 0106 EN-5

SI 6TU - SI 18TU English

7.2 Heating System Connection

CAUTION!

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.

CAUTION!

The maximum test pressure in the heating circuit and the

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

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 adjusting an overflow valve is described in the

Chapter Start-Up.

NOTE

ºººº

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 heat pump manager 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 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).

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

hydraulic integration diagram must be adhered to.

CAUTION!

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.

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.

CAUTION!

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.

NOTE

ºººº

If necessary, the operating range can be extended to a brine

inlet temperature of -10 °C. In this case, the minimum brine

concentration must be adjusted to 30 %. (Freezing

temperature -17 °C)

CAUTION!

The maximum test pressure in the heating circuit and the

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

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 14TU Manual

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