Manual Dimplex WI 100TU (page 23 of 64) (English, German, French)

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www.dimplex.de 452234.66.37 · FD 9205 EN-9

English

WI 50TU - WI 100TU

9 Cleaning / maintenance

9.1 Maintenance

To prevent malfunctions due to sediments in the heat exchang-

ers, care must be taken that no im-purities can enter the heat

source system and the heating installation. 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. They enter the heating system via the

valves, the circulating pumps and/or plastic pipes. It is therefore

essential - in particular with respect to the entire pipework - that

only diffusion-resistant materials are used.

NOTE

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. We recommend equipping diffusion-open heating systems

with an electrophysical anti-corrosion system (e.g. ELYSATOR system).

Residue from lubricants and sealants may also contaminate the

heating water.

In the case 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% phos-

phoric acid solution for cleaning purposes. However, if cleaning

needs to be performed more frequently, a 5% formic acid solu-

tion should be used.

In either case, the cleaning fluid should be at room temperature.

We recommend flushing the heat exchanger in the direction op-

posite to the normal flow direction.

To prevent acidic cleaning agents from entering the heating sys-

tem circuit, we recommend connecting the flushing device di-

rectly 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 system.

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

ers’ liability insurance associations must be adhered to.

In case of doubt, consult the manufacturer of the cleaning

agents!

9.3 Cleaning the heat source

system

ATTENTION!

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.

A dirt trap is installed in the heat source inlet of the heat pump in

order to protect the evaporator against contamination. When the

system is first put into operation, the filter screen of the dirt trap

should be cleaned at relatively short intervals. These intervals

can be prolonged once the amount of impurities detected decre-

ases.

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 permissi-

ble. Your local water utility can provide you with general informa-

tion regarding the possible use of ground water. Water analyses

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.

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Dimplex WI 100TU Manual

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