I need to fit a roomstat to my central heating syustem.
Seen one in toolstation but it states that it has an Accelerater Heater in
Anyone explain what this is please ..... ?
Cat number of item is: 76515
"Wall thermostats, when fitted, are in series with the CH signal from
the time-switch. Some have a built in resistor ("accelerator heater") to
reduce the hysteresis, i.e. the "backlash" in temperature between
switching on and switching off. When the thermostat is on, the resistor
supplies a minute amount of heat, which makes the thermostat think that
the room is slightly warmer than it is, and therefore makes it switch
off again earlier. The room temperature will thus fluctuate less. Such
thermostats require 3 cores and earth: live, switched output and neutral
for the resistor. If live and switched output are interchanged, the
resistor will be powered constantly and the advantage will be lost.
Simpler/older thermostats only need 2 cores and earth, so if you're
replacing a thermostat you might want to check the wiring beforehand to
see if you can use this feature."
Found by a Google search on "room thermostat accelerator heater"
Don't be spoilsport Sue. If you give hints like "Found by a search on
Google" then there would be no posts here at all :)
It is worth mentioning that this thermostat may not be suitable for a boiler
that uses 12 or 24 volts on it control output.
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