On Sun, 04 Mar 2012 19:41:06 -0000, John Williamson wrote:
Lieutenant Scott wrote:
On Sun, 04 Mar 2012 17:42:30 -0000, John Williamson
wrote:
Lieutenant Scott wrote:
On Sun, 04 Mar 2012 16:55:27 -0000, Harry Bloomfield
wrote:
A resistor in the room thermostat housing
But it's wildly inaccurate. And there seems to be no adjustment for
them.
It's a very cheap way to improve the responsiveness of the system. I
once disconnected one, and found out that re-connecting it it made a
noticeable improvement to my comfort in the room with no noticeable
increase in heating costs.
It was a single small room with a blown air calor gas powered heating
system, but the same principle applies to a central heating system as
used in my house.
I think the resistor in this one is making too much heat. It never
switches the heating on for very long, and I don't think it's good for
a central heating system to be cycled on and off repeatedly. I much
prefer it to come on for an hour at a time.
What's the duty cycle? Mine is about 50% at 5C outside temperature,
approaching 100% at -5C.
Similar to that. It's actually my garage - the house already has a digital one as the bi-metal ones can't handle the inductive load of the motorized valve - they arc.
If my central heating stays on for an hour, the house gains quite a few
degrees in temperature, as it's fairly well insulated. This excess heat
then has to be lost before the heating will come on again. If I set it
to be comfortable when the heating turns off, then I'm too cool before
the heating turns on again, and vice versa. I don't think it makes much
difference to the reliability or system life if it runs on a ten minute
cycle rather than a 60 minute one, though I could be wrong. It certainly
makes a difference to my comfort, which is why I have central heating to
start with, otherwise I'd use gas heaters in each room.
With the digital stat, my house goes up and down by 1C.
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