ID.: 17-16-20-2976-06 | 6.2017
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5.6 Connecting the pipe heat conductor
The water in the buffer tank for DHW can be heated by the device’s generator - the heat pump
(primary source) and/or various external heat sources. When filling the device, follow the
instructions outlined below.
CAUTION
Because different materials are used on the pipe installation, all connections on the
device (cold and hot water, circulation, heat conductor) have to be in galvanic
isolation; otherwise corrosion can occur on the inner side of the buffer tank. We
recommend placing galvanic isolators made of red brass the length of at least twice
the diameter of the pipe on the connections.
CAUTION
The water used for heating DHW via the built-in heat exchanger in the buffer tank for
DHW has to be in accordance with the requirements of standard VDI 2035. The
heating system has to be filled with soft water which has been added anti-corrosion
and antibacterial agents for preventing corrosion. Before filling the heating system
has to be cleaned of all impurities.
The heating system has to be thoroughly vented. Air leaking into the system,
including diffusion air, has to be prevented.
Maximal allowed content of individual substances in the heating water and the influence of
these on the heat exchanger are presented in the table below. It is not allowed to use heating
water which contains any substance in concentrations which cause corrosion in the heating
system (influence “-”). It is also not allowed to use heating water which contains two or more
substances in concentrations which could cause corrosion in the heating system (influence
“0”).
