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Underoorheatingsystem
For heating systems with plastic pipes, we recommend the
use of impermeable pipes to prevent the diffusion of oxygen
through the pipe walls. In heating systems
When operating the condensing boiler in conjunc-
tionwithanunderoorheatingsystem,werecom-
mend sizing the usable volume of a diaphragm ex-
pansion vessel 20 % larger than recommended by
DIN 4807-2. An diaphragm expansion vessel of
insufcientsizeresultsinoxygeningressintothe
heating system, causing corrosion damage.
Please
note
When using pipes impermeable to oxygen, an underoor
heating system can be connected directly to a heat source with
up to 10 kW heating output, subject to system pressure drop.
Alwaysinstallatemperaturelimiterfortheunderoorheating
system to protect the pipes from overheating.
The output of the integrated pump should be increased if un-
deroor heating is connected (parameters HG16 and HG17).
Recommendation HG16 Þ 75% and HG17 Þ 100%
Whenconnectinganunderoorheatingsystemwithanoutput
demand in excess of approx. 10 kW, a 3-way mixer (accesso-
ries MM) and an additional pump are required.
Install a regulating valve in the return; this can be used to
reduce the excessive head of the additional pump if required.
Ensure the system user cannot adjust any regu-
lating valves.
When using pipes that are permeable to oxygen, it is
necessary to provide system separation by means
of a heat exchanger. Inhibitors are not permissible.
If an additional heating circuit is operated in parallel to the
underoorheatingsystem,itmustbehydraulicallymatched
totheunderoorheatingsystem.
Please
note
Fig.:Underoorheatingsystem(example)
38.Technicalinformation,underoor
heating/DHWcirculation
DHW circulation
Insulate DHW circulation lines according to the statutory
regulations. Connect the DHW circulation pump to the appli-
ance control unit at output A1 as 3 different DHW circulation
programs can be set with parameter HG14.
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