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CHOOSING APPLICATION
The basic unit 1873 can be set to three different complex configurations. These are called applica-tions
and are as follows:
Single Unit refers to the use of a single 1873 to which no other devices are connected. An 1873 used
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as a Single Unit has an ice detection channel, but no zone for further control options.
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System is an 1873 with zone functions, which can be optionally extended by a communication device
to tekmar's TAV Server on the internet (Internet Gateway) or to the building manage-ment system
(Modbus Gateway). An 1873 used as a System has an ice detection channel and a zone for further
control options.
Multi Channel system is a combination of an 1873 and several 1875 devices, which can be optionally
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extended by a communication device to tekmar's TAV Server on the internet (Internet Gateway) or to
the building management system (Modbus Gateway). The system has up to 8 ice detection channels
that can be combined and controlled in up to 4 zones.
EXPLAINING A CHANNEL
An ice detection channel is a unit consisting of a heating circuit with its output relay, a combi sensor and
the associated evaluation logic. The 1873 and the 1875 each have an ice detection channel. By combining
an1873 and up to seven 1875 devices, multi channel systems with up to eight ice detection channels can
be set up.
Functions of an ice detection channel:
control and monitoring of one sensor and one heating circuit
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continuous temperature monitoring in the heated area
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activation of the moisture measurement if the temperature falls below the activation temperature
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start of the minimum heating time if the moisture threshold is exceeded on the sensor (alternatively
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triggered by an external signal at the control input)
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deactivation of the heating if the temperature falls below the switch-off temperature (lower tempera-
ture limit)
monitoring of the heating circuit output for inter-ruptions in the heating circuit and internal faults of the
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relay
optional base temperature mode in order to pre-heat an open space in the "System" or "Multi Chan-
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nel" configuration
All registered channels are alternately displayed in the idle display and listed with their channel number in
the list of registered channels. If a registered channel is not available for too long, it is marked as "offline"
and an alarm is triggered.
If a channel was known in the zone management once, it is permanently stored. If an 1875 is removed from
the configuration, it must be explicitly deleted from zone management via a menu function.
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