Dimplex LA 17PS, LA 26PS, LA 22PS manual Maintenance / Cleaning, Cleaning the Heating System

8.2

Any faults occurring during operation are also displayed on the heat pump controller and can be corrected as described in the operating instructions of the heat pump controller.

For external temperatures below 10 °C and heating water tem- peratures below 16 °C, the buffer tank should be heated up with the second heat generator to at least 25 °C.

Observe the following procedure to implement a smooth start-up:

1)Close all of the heating circuits.

2)Fully open the overflow valve.

3)Use the controller to select the automatic operating mode.

4)Wait until the buffer tank has reached a temperature of at least 25 °C.

5)Now slowly reopen the heating circuit valves in succession so that the heating water throughput is constantly raised by slightly opening the respective heating circuit. The heating water temperature in the buffer tank must not be allowed to drop below 20 °C during this process. This ensures that the heat pump can be defrosted at any time.

8 Maintenance / Cleaning

8.1Maintenance

To protect the paintwork, avoid leaning anything against the de- vice or putting objects on the device. External heat pump parts can be wiped with a damp cloth and domestic cleaner.

ATTENTION!

Never use cleaning agents containing sand, soda, acid or chloride as these can damage the surfaces.

To prevent faults due to sediment in the heat exchanger of the heat pump, ensure that the heat exchanger in the heating system can not be contaminated. In the event that operating malfunc- tions due to contamination still occur, the system should be cleaned as described below. The device may only be cleaned ac- cording to the following instructions from the manufacturer.

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6)Set the minimum volume flow quantity on the overflow valve and heat circulating pump when all heating circuits are fully open and a heating water temperature in the buffer tank of approx. 20 °C is maintained.

7)New buildings have an increased heat consumption on ac- count of the energy required to dry them out. This increased heat consumption means that marginally dimensioned heat- ing systems can not always achieve the desired room tem- perature. In such cases, we recommend keeping a second heat generator on standby during the first heating period. The limit temperature on the heat pump controller should also be turned up to 15 °C.

8.2Cleaning 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. 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!

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