Cleaning / Care; Care; Cleaning Of Heating Side; Cleaning Of Air Side - Dimplex LA 6 MR Installation And Operating Instructions Manual

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Cleaning / Care

9.1 Care

To protect the paint finish, avoid placing objects against or on the
unit. The external parts of the heat pump can be wiped with a
damp cloth and commercially available cleaning agents.
ATTENTION!
Do not use any cleaning agents containing sand, soda, acid or chloride as
these may damage the surface.
To prevent malfunctions due to dirt deposits in the plate heat ex-
changer of the heat pump, care must be taken that the heat ex-
changer cannot become contaminated in the heating installation.
In the event that operating malfunctions due to contamination
occur nevertheless, the system should be cleaned as described
below. (Caution: The fins of the finned heat exchanger have
sharp edges -> risk of cutting injuries!)

9.2 Cleaning of Heating Side

The ingress of oxygen into the heating water, especially in the
case of steel components, may result in the formation of oxida-
tion products (rust). These may enter the heating system through
valves, circulating pumps or plastic pipes.
ATTENTION!
To prevent the formation of deposits (e.g. rust) in the plate heat
exchanger of the heat pump, we recommend using an appropriate
corrosion protection system
Additional contamination of the heating water caused by resi-
dues of lubricating and sealing agents can be observed in many
cases.
Both of the above causes may lead to a reduction in the perform-
ance of the plate heat exchanger of the heat pumps. In such
cases, the installer must clean the heat exchanger concerned.
Based on information known to date we recommend cleaning
with a 5% phosphoric acid solution or, in the case that cleaning
needs to be performed more frequently, with a 5% formic acid so-
lution. In both cases the cleaning fluid should be at room temper-
ature. Thorough flushing is necessary to ensure that all cleaning
agent residues are removed from the system. It is recommended
that the heat exchanger be cleaned in the direction opposite to
the normal flow direction. Owing to their acid content, flushing
agents must be used with caution. To prevent acidic flushing
agents from entering the heating installation when cleaning the
condenser, we recommend that the flushing device be mounted
directly to the supply and return line of the heat pump. The regu-
lations of the trade associations must be adhered to. If in doubt,
contact the manufacturers of the chemicals!
ATTENTION!
To prevent consequential damage it is imperative that the water circuit be
neutralized after cleaning using appropriate agents.
EN-8
Caution - Heating Contractors
Depending on the water quality and quantity, in particular in the
case of mixed installations and plastic pipes, mineral deposits
(rust sludge, lime) may form impairing the proper functioning of
the heating installation. A cause of this is the water hardness as
well as oxygen dissolved in the filling water as well as additional
oxygen from the air which may penetrate via valves, fittings and
plastic pipes (oxygen diffusion). As a preventive measure it is
recommended that a physical water conditioner such as ELYSA-
TOR be used.

9.3 Cleaning of Air Side

Finned heat exchangers, fan and condensate drain should be
cleaned of debris (leaves, branches, etc.) prior to the start of the
heating season. Contamination of this nature can be removed
manually using compressed air or by washing off with clear wa-
ter.
The appliance cover and the air intake grille may have to be re-
moved for this purpose.
ATTENTION!
Prior to opening the unit it must be ensured that all electrical circuits are
disconnected from the power supply.
When cleaning do not use any sharp or hard objects so as to pre-
vent any damage to the evaporator and the condensate pan.
Extreme weather conditions (e.g. heavy snow) may in some
cases result in ice build-up on the inlet and outlet grilles. To as-
sure a minimum air flow rate, clear the inlet and discharge areas
of snow and ice, if needed.