Dimplex SI 5ME Maintenance and Cleaning, Faults / Trouble- Shooting, Decommissioning / Disposal

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9Maintenance and Cleaning

9.1Maintenance

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.

9.2Cleaning 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. This oxygen enters the heating system via the valves, the circulating pumps and/or plastic pipes. It is there- fore essential - in particular with respect to the piping of under- floor 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. It is 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 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!

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 controller.

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. Observe all environmentally-relevant requirements regarding the recovery, recycling and disposal of materials and components in accordance with all applicable standards. Particular attention should be paid to the proper dis- posal of refrigerants and refrigeration oils.

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9.3Cleaning 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.

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