Dimplex SI 75ZS - Manual (Page 9)

9
CARE/CLEANING
9.3 Cleaning of Heat Source Side
The supplied strainer is to be install-
ed in the heat source inlet of the heat pump in
order to protect the evaporator against conta-
mination.
The filter screen of the strainer should be cleaned
one day after commissioning, thereafter every week.
If no more contamination can be noticed any more,
the strainer filter can be removed in order to reduce
pressure losses.
9 CAUTION!
CARE/CLEANING
9.1 Care
The heat pump is maintenance-free. To prevent
malfunctions due to sediments in the heat
exchangers, care must be taken that no im-
purities can enter the heat source system and
the heating installation. In the event that
operating malfunctions due to contamination
occur nevertheless, the system should be
cleaned as described below.
9.2 Cleaning of Heating Side
The ingress of oxygen into the heating water circuit
may result in the formation of oxidation products
(rust). It is therefore important - in particular with
respect to the piping of underfloor heating systems
- that the installation is executed in a diffusion-
proof manner. Also residues of lubricating
a n d s e a l i n g a g e n t s m a y c o n t a m i n a t e t h e
heating water.
In the case of severe contamination leading to a
reduction in the performance of the condenser in
the heat pump, the system must be cleaned by a
heating technician.
Based on current knowledge, 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 solution.
In either case, the cleaning fluid should be at room
temperature. It is recommended that the heat
exchanger be cleaned in the direction opposite to
the normal flow direction.
To prevent acidic cleaning agents from entering
the circuit of the heating installation we recommend
that the flushing device be fitted directly to the supply
and return lines of the condenser of the heat pump.
Thereafter the system must be thoroughly
flushed using appropriate neutralising agents
in order to prevent any damage caused by
c l e a n i n g a g e n t r e s i d u e s t h a t m a y s t i l l b e
present in the system.
All acids must be used with great care, all relevant
regulations of the employers' liability insurance
associations must be adhered to.
If in doubt, contact the manufacturer of the
chemicals!
Caution - Heating Technicians !
Depending on the filling water quality and
quantity, in particular in the case of mixed
installations and plastic pipes, mineral deposits
(rust sludge, lime) may form, impairing the pro-
per functioning of the heating installation. A
reason for this is the water hardness and oxygen
dissolved in the filling water as well as additio-
nal oxygen from the air, which may penetrate via
valves, fittings and plastic pipes (oxygen diffu-
sion). As a preventive measure it is re-
commended that a physical water conditio-ner
such as ELYSATOR be used.
CAUTION!