34
Maintenance
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.
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. This oxygen enters 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 under-floor heating systems - that only diffusion-proof materials are
used.
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 heat exchanger in the heat pump,
the system must be cleaned by a heating technician. We recommend flushing the heat exchanger
in the direction 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 flow of the heat exchanger. It is important that the system be thoroughly flushed
using appropriate neutralizing agents to prevent any damage from being caused by the 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 to be used.
Cleaning the Heat Source System
A particle filter is inserted in the heat source inlet of the heat pump to protect the heat exchanger
against the ingress of impurities. When the system is first put into operation, the filter screen of
the particle filter should be cleaned in relatively short intervals. These intervals can be prolonged
once the amount of impurities decreases.
Water Quality Requirements
The ground water should not contain any substances that could form deposits.
The use of surface water or water containing salt is not permissible. Your local water utility can
provide you with general information regarding the possible use of ground water. Water analyses
are carried out by specially-equipped laboratories.
A suitable corrosion protection system to prevent the formation of deposits (e.g. rust) in the heat
exchanger of the heat pump is recommended.
Maintenance
