DOMUSA DUAL CLIMA 11, Installation And Operating Instrictions

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DUAL CLIMA
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9.7 Freeze Protection
The DUAL CLIMA heat pump is a machine that is installed in the exterior of the home, so that it will
be exposed to the extreme climatic conditions of cold in the periods of frost. Because of this, it is of
paramount importance that this type of machine is protected against such frost, as its internal
construction and the amount of water inside it make it more prone to freezing. The freezing of the
water inside the heat pump causes the rupture of the heat exchanger, with the subsequent
interruption of its operation and major economic expenses involving its repair.
For these reasons, it will be mandatory to use a safety system in the installation to prevent the
freezing of water in the machines. DOMUSA TEKNIK proposes the use of any of the following
systems:

Antifreeze liquid (glycol): The antifreeze liquid must be diluted with the water inside the
heat pump. The concentration of glycol in the mixture must be calculated taking into account
the historical minimum temperature of the climatic zone where the machine is located and
the concentrations indicated by the manufacturer of the glycol for said minimum
temperature. Additionally, it will be essential to perform a periodic analysis of the water-
glycol mixture to ensure that the proper properties and mixing percentage are maintained
over time (at least once a year).

Antifreeze valve of the exteriors: The antifreeze valve or valves should be installed outside
the building, in the water circuit of the heat pump, near the heat pump, if possible. It should
be ensured that, when activated, the entire water content in the interior of the machine is
drained. Due to the construction of the DUAL CLIMA heat pump, to drain the water content,
at least one antifreeze should must be installed in the water drain pipe (between the machine
and the drain valve).
DOMUSA TEKNIK optionally offers an antifreeze valve kit especially
designed to be installed in the DUAL CLIMA heat pump.
In addition to these active systems for antifreeze safety, a water filter must be installed in the water
circuit of the heat pump, in order to avoid obstructions or narrowing caused by dirt in the
installation to help accelerate the freezing process or to cause the water drainage devices not to
work properly. The filter must be installed before filling the installation with water and in the return
branch of the machine, to avoid the entry of dirty water into the heat exchanger. The type of filter
installed must be adapted to the particular characteristics of each installation (type and material of
the water pipes, type of water used, water volume of the installation, etc.). The water filter should
be checked and cleaned, if necessary, at least once a year. IN new installations, however, it is
advisable to check it within the first few months of its commissioning.
DOMUSA TEKNIK will not cover damages caused by the lack of any of these antifreeze safety
systems described above.
In installations where glycol has not been added, in case of prolonged periods of absence, to
prevent possible accidental power failures and/or heat pump failure, the water in the machine must
be drained. In periods of frost, the absence of electricity for 30 minutes or more may cause the
water to freeze.
The electronic controller of the DUAL CLIMA heat pump has a function for protection against the
freezing of the water in its interior in periods of frost. For this function to remain active and on alert,
the heat pump must be connected to the mains and have a power supply, even if it is switched off
or not in use.