9
MAINTENANCE/CLEANING
After cleaning it is essential to neu-
tralize the system by suitable means in order to
prevent secondary damages to the heating
system.
Attention - heating plant installers -
Depending on the fill water quality and volume
occasional dirt collection (rust sludge, calcerous
deposits) may occur especially in case of mixed
installations and plastic piping so that the
performance of the heating system may be
compromized. This is due to the water hardness
and the oxygen solved in the fill water and the
oxygen in the air that may enter the system at
valves, fittings and plastic pipes (oxygen diffu-
sion). To prevent this from happening we
recommend the use of a physical water treatment
device like e.g. ELYSATOR .
CAUTION !
9.3 Cleaning the heat source side
Install the enclosed dirt trap in the heat source
inlet of the heat pump in order to protect the
evaporator from impurities. After the initial startup
the filter screen of the dirt trap should be cleaned
regularly in relatively short intervalst. As soon as
detectable impurities become less the intervalls
can be extended accordingly.
9
MAINTENANCE/
CLEANING
9.1 Maintenance
The heat pump operates maintenance-free.
Make sure that the heat source and heating
circuits are kept free from impurities to prevent
malfunction of the heat pump due to dirt
collections in the heat exchangers. Should a
malfunction of that type occur, clean the unit as
described below.
Disconnect all voltage supplies prior
to opening the unit.
9.2 Cleaning the heating side
Oxygen may cause the formation of oxydation
products (rust) in the hot water circuit. Pipe
connections must not allow oxygen diffusion
which applies particularly to pipes used in
underfloor heating. Remnants of lubricants and
sealants may also contaminate the heating
water.
If contamination is so bad that the performance
of the liquefier in the heat pump is degraded,
the installation must be cleaned by a specialist.
Based on today's experience we suggest to use
5% phosphorous acid for general cleaning or, if
cleaning is required in shorter intervals, 5%
formic acid .
In both cases the cleaning liquid should be used
at room temperature. Scavenging the heat ex-
changer in the direction opposite to the normal
flow is recommendable.
In order to prevent acid-containing cleaning li-
quid from entering the heating water circuit we
suggest to connect the scavenging unit directly
to the forward and return lines of the liquefier in
the heat pump.
Following that it is essential to thoroughly rinse
the system with a suitable neutralizing agent
so that all remnants of the cleaning agent are
removed from the system.
Handle acids with care. Always follow the
instructions of the occupational associations.
In case of doubt consult with the manufacturer
of the cleaning agent!
CAUTION !
CAUTION !
Summary of Contents for WI 40CG
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