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5
WARRANTY
WEATHER SENSOR & WEATHER FORECAST
For the base temperature and pre-heating mode, the system must have information on the outside air
temperature. This requires either an outdoor weather sensor (north side, no direct sunlight) or a weather
forecast that the system receives from tekmar's TAV Server via the Internet Gateway. Both sources are
evaluated independently of each other as a single value and as far as possible as a time series. If both
sources are equally available, the weather forecast has priority for determining the effective outdoor
temperature, as it enables a pre-dictive calculation of the heat demand.
With two parameters the calculation of the heat demand of the open area can be adapted to the local
conditions. The "ground characteristic" takes into account the inertia of the open area with re-spect to
changes in the ambient temperature. It thus takes into account the past outside temperatures for calcu-
lating the effective outside temperature. The "heat-up characteristic" is the speed at which the open area
can be heated via the heating circuit.
ALARM MANAGEMENT
The alarm management of the 1873 monitors all devices, sensors and heating circuit outputs in a system
for fault conditions. A detected error is reported via the display and the alarm relay and can be forwarded
to a higher level via the Modbus Gateway.
Functions of alarm management:
monitoring of all ice and snow detectors and their sensors in a system
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monitoring of all heating circuit outputs in a system
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alarm function can be deactivated for each zone
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adjustable alarm delay
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forwarding of an alarm via the alarm relay and/or the Modbus Gateway
The alarm relay is designed as a change over contact and can therefore be used for both open-circuit
and closed-circuit alarm circuits. By inverting the alarm relay in the menu, a power failure can also be
reported (alarm inverted and signal loop via the normally open/change-over contact).
Due to its insulation, the alarm relay can be used for both mains voltage and SELV circuits.
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