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11
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. 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!
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.
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.