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ÜKY/DUO Boiler User Manual
Warning against frost protection:
The heating installation must be completely isolated. Outdoor parts of the installation should be
isolated more than the interior parts. If operating with an open expansion tank, the return and return
pipes to the expansion line must be isolated or even the expansion tank must be isolated.
Considerations in new installations:
To minimize the addition of fresh water system design and sizing should be done correctly. None of
the materials used in the installation must have a gas permeability. A maximum of 50 micron filters
of synthetic or metal porous must be placed on the fresh water splicing line. In closed expansion
systems, the pressure must be above atmospheric pressure throughout the installation.
Considerations for heating connected to old installations:
A long-term heating system produces a protective layer (black magnetite) on metal surfaces in
contact with water. When a new boiler is installed in the old system, the clean surfaces of the boiler
will be the first place to start corrosion. Therefore, when a new boiler is connected to the old heating
system, in addition to the measures to be taken for new systems, the following issues should be
considered:
1. The old system must be thoroughly rinsed to remove any impurities and sediments from the boiler
before connecting.
2. A manual valve air separator must be installed at the top of the system.
Before installing a new boiler in the old heating installation, the installation must be
washed several times with water.
The chimney must be cleaned before installation into the old chimney installations.
Each boiler chimney must be detached. Never connect more than one boiler to the
same flue system.
