DT92 WIRELESS DIGITAL ROOM THERMOSTAT
12
SYSTEM OPERATION
RF Signal Propagation
As the DT92 room thermostat and relay box
communicate using RF technology, special care must
be taken during installation. The location of the RF
components as well as the building structure may
influence performance of the RF system.
DT92 uses 2-way RF technology, and this allows the
signal strength to be measured and communicated, to
ensure correct placement of the room thermostat in a
high signal strength area. See
RF Communication
Test
and
Signal Strength Test
sections for a
description of these features.
Within a typical residential building the two products
should communicate reliably within a 30m range. It is
important to take into consideration that walls and
ceilings will reduce the RF signal. The strength of the
RF signal reaching the Relay Box depends on the
number of walls and ceilings separating it from the
room thermostat, as well as the building construction -
the diagram below illustrates an example of typical
signal strength reduction. Walls and ceilings reinforced
with steel or plasterboard walls lined with metal foil
reduce the RF signal significantly more.
Automatic Operation
The display on the DT92 room thermostat will indicate
(by means of the flame symbol) the actual status of the
relay in the BDR91 relay box.
The green LED on the BDR91 relay box will illuminate
when the relay is on, and will go off when the relay is
switched off.