5
Functional description
Heating and cooling operating mode
Modern heat pump systems often also provide the option of cooling rooms. This func-
tion is supported by the cover by means of the "Heating and cooling" operating mode.
In this operating mode, the system permanently regulates the temperature to the set
cooling temperature. There are no time programs in cooling mode. The cooling tem-
perature can only be changed via the temperature parameters, and not using the +/-
buttons.
In conjunction with a Room thermostat insert, cooling mode is activated by applying
mains voltage to input terminal "C". With switch inserts, cooling mode is activated by
applying mains power to extension input "1". In general, the heat pump features a
corresponding output or a switch can be used.
Frost protection / temperature drop detection
Ʒ
The frost protection temperature is the minimum temperature to which the system is
regulated in order to avoid frost damage. In case of a significant temperature drop,
e.g. after opening a window, the system is regulated to the frost protection temperat-
ure for a maximum of 30 minutes. For this, the temperature drop detection parameter
Ʒ
must be activated.
Optimised heating up
ƹ
Heating is started at most 4 hours before the switching time, so that the desired tem-
perature has been reached at the switching time rather than starting to heat up at
that time. The display icon
ƹ
flashes during the heat-up phase.
Note: Optimised heating up is designed for panel heating/radiators.
Offset
Ƴ
If the system detects that the displayed actual temperature differs from the general
room temperature, this parameter can be used to enter a correction value in 0.5 °C
increments. The actual temperature will then be corrected by this offset value.
Controller adaptation
Ƽ
The control principle should be adjusted depending on the heating system and the in-
sert used.
Two-point control: The output remains switched on until the selected target temperat-
ure has been exceeded by 0.5 °C. The output will not be switched on again until the
setpoint value is undercut by 0.5 °C. Since most heating systems respond very
slowly, this type of control can entail temperature overshooting.
Pulse width modulation control (
Ƽ
): Optimised for electrothermal valve drives,
e.g. TVA 230 NC WW: The output is not permanently actuated, but only for a time
period (pulse width) dependent on the difference between the target temperature and
the actual temperature. This method brings the actual temperature gradually closer to
the target temperature. The cycle time is 15 minutes.
LB Management room thermostat display
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17.08.2022
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