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6.1.4 LT/HT zone system
The central heating system can be divided into two groups,
each with a dierent heating temperature, for example a high-
temperature zone (HT) with radiators and a low-temperature
zone (LT) with underfloor heating system without its own
circulation pump.
Both zones must have their own room thermostat. LT/HR
zone control is activated by the adjustment of a number of
parameters.
There are two dierent installation sets available for installing
the LT/HT zone system:
► Installation set with two-way valve (item no 093697).
► Installation set with three-way valve (item no 093707).
Operational principle
The valve divides the heat over both zones. Both zones have
their own room thermostat and are alternately (time-limited)
heated through switching over the valve.
IMPORTANT
► Ensure that the external pump pressure
of the central heating pump in the boiler
is taken into consideration during the
design phase of the underfloor heating.
► If the radiators in the HT zone have
thermostatic radiator valves, this zone
must have a bypass valve.
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