Bedienungsanleitung Dimplex SI 70CS (Seite 19 von 56) (Deutsch, Englisch, Französisch)

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9 Maintenance and

Cleaning

9.1 Maintenance

The heat pump is maintenance-free. 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 operating 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 products enter the heating system

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

therefore essential - in particular with respect to the piping of un-

derfloor heating systems - that only diffusion-proof materials are

used.

ATTENTION!

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 case of severe contamination leading to a reduction in the

performance of the liquifier in the heat pump, the system must be

cleaned by a heating technician.

According to today’s state of knowledge, 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 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 flow of the liquifier of the heat pump.

It is important that the system be thoroughly flushed using appro-

priate neutralising agents to prevent any damage from being

caused by cleaning agent residue remaining in the system.

Acids must be used with great care and all relevant regulations of

the employers’ liability insurance associations must be adhered

to.

If in doubt, contact the manufacturer of the chemicals!

9.3 Cleaning the Heat Source

System

ATTENTION!

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.

Clean the dirt trap’s filter screen one day after start-up and sub-

sequently in weekly intervals. If no more signs of contamination

are evident, the filter can be removed to reduce pressure drops.

9.4 Maintenance

Devices with a minimum of 3kg refrigerant, or hermetically

sealed devices with a minimum of 6 kg refrigerant must be leak-

proof tested yearly by the operator according to ES842/2006.

The leak-proof testing is to be documented and archived for a

minimum of 5 years. The test is to be carried out by certified per-

sonnel only according to (EG) Nr. 1516/2007. The attached table

can be used as a basis for the documentation.

10 Faults / Trouble-

Shooting

This heat pump is a quality product and is designed for trouble-

free operation. In the event that a fault should occur, it will be in-

dicated on the heat pump manager display. Simply consult the

Faults and Trouble-shooting page in the operating instructions of

the heat pump manager.

If you cannot correct the fault yourself, please contact your after-

sales service technician.

ATTENTION!

Any work on the heat pump may only be performed by authorised and

qualified after-sales service technicians.

ATTENTION!

Disconnect all electrical circuits from the power source prior to opening

the device.

11 Decommissioning /

Disposal

Before removing the heat pump, disconnect it from the power

source and close all valves.

All environmentally-relevant requirements regarding the recov-

ery, recycling and disposal of materials and components should

be observed in accordance with the applicable standards. Partic-

ular attention should be paid to the proper disposal of refrigerants

and refrigeration oils.

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