On Tue, 28 Dec 2004 13:33:32 +0000, Ali
strung together this:


Hi,

My old Honeywell room thermostat needs changing. I bought a Horstmann
HRT2. The old wiring was twin and earth style with the earth cut off
(not used) and just the live and neutral cables being wired in. The
instructions for the new thermostat indicates that 3 wires are needed:
L - Common supply, Load - Call for Heat, N - Neutral. Can I use the
existing wiring and just omit one of the connections ? If so, which
one ?

The old wiring is live and call, not live and neutral.

Connect up the live to the common suppy and the call to call. You can
omit the neutral connection, it helps to keep the temperature more
regulated, basically.

I would recommend you use a programmable room stat as these are more
accurate and will work with only the two wires that you have.
--

SJW
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