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LA 1422C
NOTE
Operating the heat pump at low system temperatures may
cause the heat pump to break down completely.
8
Cleaning/maintenance
8.1 Care
To protect the paintwork, avoid leaning anything against the
unit or putting objects on the unit. The outdoor components of
the heat pump can be wiped with a damp cloth and commer-
cially available domestic cleaner.
NOTE
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 sys-
tem cannot be contaminated. We recommend protecting the
evaporator by installing a bird guard in the inlet duct. At least
80% of the cross section should be open. Should operating
malfunctions due to contamination still occur, however, the
system should be cleaned as described below.
8.2 Cleaning the heating system
NOTE
Pressure relief devices must be checked and maintained
regularly.
NOTE
The integrated dirt trap must be cleaned at regular intervals.
The maintenance intervals should be defined according to the
degree of soiling in the system. The filter insert should also be
cleaned.
For cleaning, the heating circuit must be made pressureless in
the vicinity of the dirt trap, the filter compartment unscrewed,
and the filter insert removed and cleaned. Assembly carried out
in reverse order requires attention to correct assembly of the
screen inserts and tightness of the screw joints.
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 enter the heating system via the
valves, the circulating pumps and/or plastic pipes. A diffusion-
resistant installation is therefore essential, especially with re-
gard to the piping of underfloor heating systems.
NOTE
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 event of severe contamination leading to a reduction in
the performance of the liquefier in the heat pump, the system
must be cleaned by a heating technician.
Based on current information, we recommend using a 5%
phosphoric acid solution for cleaning purposes. If cleaning
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needs to be performed more frequently, a 5% formic acid solu-
tion should be used.
In both cases, the cleaning fluid should be at room tempera-
ture. Rinsing the heat exchanger against the normal flow direc-
tion is recommended.
To prevent acidic cleaning agents from entering the heating
system circuit, we recommend connecting the flushing device
directly to the flow and return of the liquefier of the heat pump.
It is then 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 sys-
tem.
Acids must be used with care and the regulations of the em-
ployers liability insurance associations must be adhered to.
The instructions of the cleaning agent manufacturer must al-
ways be observed.
8.3 Cleaning the air system
The air ducts, evaporator, ventilator and condensate drain
should be cleaned of contamination (leaves, twigs, etc.) before
each new heating period. To do this, the heat pump must be
opened at the side. The bottom section should be opened first,
followed by the top section.
CAUTION!
Before opening the unit, ensure that all electric circuits are
disconnected from the power supply.
Remove and rehang the side panel assemblies, as described in
Chapter 4.
To prevent the evaporator and the condensate tray from being
damaged, do not use hard or sharp objects when cleaning.
452170.66.02-EN · FD 0305
English
EN-13
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