Manual Dimplex WI 140TUR plus (page 29 of 72) (English, German, French)

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www.gdts.one 452234.66.76 · FD 9912 EN-11

WI 140TUR+ English

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 there-

fore 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 %

phosphoric acid solution for cleaning purposes. However, if

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

acid solution should be used.

In either case, 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 manufacturer's instructions regarding cleaning agent must

be complied with at all times.

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 inter-

vals can be prolonged once the amount of impurities detected

decreases.

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.

As a rule, your heat pump system should be equipped with an

intermediate circuit. Irrespective of any legal regulations, a

water analysis must be carried out if a system is to be operated

without an intermediate circuit to establish conclusively

whether the ground water is compatible for the evaporator of a

heat pump (compare table). If one characteristic is negative “-”

or two characteristics are “0”, the water quality is not sufficient

for the heat pump.

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]

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Dimplex WI 140TUR plus Manual

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