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From: terryS on 16 Dec 2009 11:53
> terry wrote:
> > We have just replaced a 40 year old 'analog' thermostat that we felt
> > was sticking or not reacting properly, with a simple electronic one.

> > The new thermostat has a capacity of 2000 watts (in this case a single
> > 1.2 or 1.5 k.watt heater in one 10' by 13' bedroom) and seems to
> > work well enough.


> > However it creates all kinds of RFI (Radio Freq. Interference) only
> > faintly apparent on a radio some 30 feet away tuned to the 640
> > kilohertz station we listen to most of the time. But 'roaring' when not
> > on any station! Haven't done any tests at other frequencies yet. e.g.
> > FM.


> > The thermostat appears to cut in an out at frequent intervals, not the
> > occasional swift 'snap action' of the original one. Then while 'on' it
> > produces a signal with what seems to be a 60 hertz buzz. While
> > installing it looked to be some sort of triac mounted on a heat sink.
> > Seems to a single pole device whereas the original was double pole; or
> > single pole with a second pole for turning it off in the other 230
> > volt leg?


> > Very surprised our variuos regulatory authorities, in USA the FCC and
> > the similar authority in say, Canada, allow these interfering devices
> > to be sold? But by same token we have a non rechargeable shaver that
> > emits a god awful racket even when just plugged in. Fortunately it
> > only has short couple of foot range of interference!


> > Will probably plan to remove the electronic thermostat; seem to recall
> > have a spare 'oldie' thermostat somewhere. BTW, the only repairs we
> > have had to our electric heating since 1970 has been three
> > thermostats, one of which was changed for reasons of 'decor'; and one
> > 20 amp DP circuit breaker. Can't complain about that in comparison to
> > say oil, or gas (not available here), fired equipment .


> Hi,
> Brand name of the 'stat?
> Use some Ferrite cores.- Hide quoted text -


Yup. Thanks for the comment might try that; slipping the connecting
wires through some ferrite cores, possibly off a computer power cord
etc.
But irritating is it not that sometheing is not compatible with
existing situation?

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