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2.3.1. Connection of the room thermostat
The Controller can be connected to a different type room thermostat, having
independent switch circuit closer that is switched on, when the real room temperature is lower
than the assigned one. In fact the thermostats equipped with a relay on their outputs (which
are most of the programmable thermostats) and some of the electronics thermostats meet that
requirement. The thermostats having a phase of their output (result of the power supply) have
to be connected by means of a middle relay.
There is a safety voltage of 5 V between the Controller terminals, designed for a room
thermostat connection that allows the thermostat to be connected by a two-core regular cable
2x0.35mm
2
. The cable is intended to transfer two-digit information and therefore its length
has to be fixed only in relation with its resistance that can reach 100
The room thermostat location is something very important. It is suitable the thermostat
to be placed at the most occupied room in the house that will become a standard for the whole
house (premises) heating. Such areas could be the living-room and the kids’ room in the
family houses. The position of the room thermostat in the kitchen is not correct, because it can
be influenced by the cooking. The location in the corridors is incorrect either, because of its
temperature that differs from the room one. The room thermostat has to be mounted far from
radiators (or other heating elements) and any sun shine influence. It should not be installed on
the outer wall, where the cooling of the masonry will affect to the results of the thermostat
operation. Sometimes the above mentioned unfavorable influences can be used to improve the
thermostat functions, for example when a thermostat with a high hysteresis is getting closer to
the heating elements, providing quicker reaction to the temperature variation; or a thermostat
mounted on the outer wall can provide in time reaction to the variation of the outdoor
temperature.
