Bedienungsanleitung Dimplex WI 45TU (Seite 27 von 72) (Deutsch, Englisch, Französisch)

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www.glendimplex.de 452237.66.49a · FD 0108 EN-9

WI 35TU - WI 45TU English

9 Cleaning / maintenance

9.1 Maintenance

To prevent faults due to sediment in the heat exchangers, care

must be taken to ensure that no impurities can enter either the

heat source system or the heating system. In the event that op-

erating malfunctions due to contamination occur nevertheless,

the system should be cleaned as described below.

9.2 Cleaning the heating system

The ingress of oxygen into the heating water circuit may result

in the formation of oxidation products (rust), particularly if steel

components are used. These enter the heating system via the

valves, the circulating pumps and/or plastic pipes. A diffusion-

resistant installation is therefore essential, especially with re-

gard to the piping of underfloor heating systems.

NOTE

ºººº

We recommend the installation of a suitable corrosion

protection system to prevent the formation of deposits (e.g.

rust) in the condenser of the heat pump.

Residue from lubricants and sealants may also contaminate the

heating water.

In the event of severe contamination leading to a reduction in

the performance of the liquefier in the heat pump, the system

must be cleaned by a heating technician.

Based on current information, we recommend using a 5 %

phosphoric acid solution for cleaning purposes. However, if

cleaning needs to be performed more frequently, a 5 % formic

acid solution should be used.

In both cases, the cleaning fluid should be at room tempera-

ture. We recommend flushing the heat exchanger in the direc-

tion opposite to the normal flow direction.

To prevent acidic cleaning agents from entering the heating

system circuit, we recommend connecting the flushing device

directly to the flow and return of the liquefier of the heat pump.

It is then important that the system be thoroughly flushed using

appropriate neutralising agents to prevent any damage from

being caused by cleaning agent residue remaining in the sys-

tem.

Acids must be used with care and the regulations of the em-

ployers liability insurance associations must be adhered to.

The instructions of the cleaning agent manufacturer must al-

ways be observed.

9.3 Cleaning the heat source

system

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 filter sieve of the dirt trap should be cleaned one day after

start-up. Further checks must be set according to the level of

dirt. If no more signs of contamination are evident, the filter can

be removed to reduce pressure drops.

9.4 .Water quality requirements

Irrespective of any legal regulations, the ground water should

not contain any substances that could form deposits. Iron

(< 0.2 mg/l) and Manganese (< 0.1 mg/l) limit values must be

adhered to to prevent iron ochre sedimentation from forming in

the heat source system.

The use of surface water or water containing salt is not permis-

sible. Your local water utility can provide you with general infor-

mation regarding the possible use of ground water. Water anal-

yses are carried out by specially-equipped laboratories.

Irrespective of any legal regulations, a water analysis must be

carried out to establish conclusively whether the ground water

is compatible for the evaporator of a heat pump (see table).

If one characteristic is negative “-” or two characteristics are

“0”, the water quality is not sufficient for the heat pump.

If the necessary water quality is not achieved or if this cannot be

guaranteed long-term, we recommended installing a brine-to-

water heat pump equipped with an intermediate circuit.

Table:

Resistance of copper-soldered stainless steel plate heat ex-

changers to substances contained in the water

+ Normally good resistance

0 Corrosion problems can arise,

particularly if several factors receive an evaluation of “0”

- Should not be used

[<: less than, >: greater than]

Evaluation characteristic

Approximate

concentration

range (mg/l)

Evaluation of

the copper

Substances that can settle (org.) 0

Ammonia NH3< 2

2 to 20

> 20

Chloride < 300

> 300

Electrical conductivity < 10  S/cm

10 to 500  S/cm

> 500  S/cm

Iron (Fe), dissolved < 0.2

> 0.2

Free (aggr.) carbonic acid < 5

5 to 20

> 20

Manganese (Mn), dissolved < 0.1

> 0.1

Nitrate (NO3), dissolved < 100

> 100

PH value < 7.5

7.5 to 9

> 9

Oxygen < 2

> 2

Hydrogen sulphide (H2S) < 0.05

> 0.05

HCO3-/SO42-> 1

< 1

Hydrogen carbonate (HCO3-) < 70

70 to 300

> 300

Aluminium (Al), dissolved < 0.2

> 0.2

Sulphate < 70

70 to 300

> 300

Sulphite (SO3), free < 1 +

Chlorine gas (Cl2)< 1

1 to 5

> 5

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