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I own a Honeywell CT3400 thermostat, which I purchased,
here
in Canada in 1998. It supports displaying temperatures
both in
degrees Celsius or Fahrenheit as well as both a 12 or 24
hour
clock. The default setting is �F/12 hour.
The users guide was
printed in the USA, although it is bilingual (English/French).
In the English manual the main temperatures are in �F with (�C)
listed afterward in parentheses. In the French manual, the opposite
is true. The temperatures are in �C
with (F�) in parentheses.
The default setting is, as you would expect, for �F and 12
hour clock.
To change this there are two screws on the back which
must
be backed off.
Stephen
P.S. I always find it interesting that many of
the bilingual user guides
and/or labels here in Canada will often display FFU on the
English
side, maybe with SI as a secondary measurement. But on
the
French side it's the opposite. In reality, French
speaking Canadians
are no more familiar with metric than the Anglo Canadians are,
the
possible exception being that there may be more immigrants
from
Francophone countries amongst the French speaking
Canadians.
----- Original Message -----
Sent: 26 January 2003 13:10
Subject: [USMA:24639] Re: Programmable
Thermostat
2003-01-26
Bill,
Your posting reminded me of the situation with my
Honeywell CT2800 model thermostat. I had won this thing as a door prize
some years ago and never used it until recently. Like you I had an
older thermostat of a different brand that was in degrees Celsius, selectable
by a solder jumper. I just changed the jumper so it would work in
degrees Celsius. And everything was fine for many years.
Then one day it broke and I was forced to use the
Honeywell. I called the Honeywell 1-800 service number located on the
bottom of the attached instruction label. I was told by the kid who
answered that the unit could not be converted. After your posting, I
decided to get the model number and check the web site and lo and behold, I
found this:
14. Why did my displayed temperature
drop about 50 degrees (slipping into Celsius reading)?
There is a
temperature conversion screw marked "C" on the back of some thermostats. When
it is in tight, the thermostat will display temperature in degrees Fahrenheit.
When the screw is turned out (lose), the display reads Celsius. Simply backing
the screw out, re-tightening, and pressing the RUN PROGRAM key should put your
thermostat back into the Fahrenheit mode.
24. How do I switch the thermostat
from reading in Fahrenheit to Celsius, and vice versa?
On the back of the thermostat, there is a screw labelled C.
To display the temperature in Fahrenheit, adjust the screw in. To display the
temperature in Celsius, adjust the screw out one turn.
I have yet to find the screw mentioned, but as soon as I do, I will
change it. I am surprised they don't mention this is the literature or
in the manual.
This model will only operate in the 12 h mode:
I also wonder how they keep track of the units that are destined for the
US market and those for non-US markets. The model number does not appear
to change. I wonder if they just default all units to Fahrenheit and
allow the installer to change the scale when installed. This is a sneaky
way to get Fahrenheit into metric homes, as in some cases the installer might
not know how to set it for degrees Celsius or lie to the customer and say it
can't be done.
Who else out there has come across this situation? What is the
experience of our friends in Canada and Mexico (NAFTA countries)? What
about the EU and Australia? Are these products usable in your markets or
are your systems so different these thermostats can't be used anyway?
Inform us!!
Check out the operating specs on these models and see if they will work
outside of North America. These units operate on 24~30 V-ac. If
they don't, then I can see where degrees Celsius is a moot point for them and
the ability of them to work in degrees Celsius is meant for the Canadian and
Mexican markets. But, do they set the default to degrees Celsius when
sold in these markets? That is an important question to have
answered.
John
----- Original Message -----
Sent: Sunday, 2003-01-26 01:36
Subject: [USMA:24633] Re: Programmable
Thermostat
> $33.97 plus $2.46
sales tax (7.25%).
>
> They're slide jumpers. There's a third one
to set the minimum on/off time,
> with a default of 5 minutes (jumper
on) and an option (jumper off) of 2
> minutes.
>
>
Interestingly, in spite of the 24-hour and Celsius options, there's
nothing
> about it on the package. The options are listed on the
instruction sheet,
> under "Advanced Features." All of the illustrated
operating examples use
> am/pm times and degrees Fahrenheit.
>
> Bill Potts, CMS
> Roseville, CA
> http://metric1.org [SI Navigator]
>
> >-----Original
Message-----
> >From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On
> >Behalf Of kilopascal
>
>Sent: Saturday, January 25, 2003 21:10
> >To: U.S. Metric
Association
> >Subject: [USMA:24632] Re: Programmable
Thermostat
> >
> >
> >2003-01-25
>
>
> >How much did you pay for this unit? What type of
jumpers does it have,
> >solder, switch or slide on?
>
>
> >John
> >
> >
> >----- Original
Message -----
> >From: "Bill Potts" <[EMAIL PROTECTED]>
>
>To: "U.S. Metric Association" <[EMAIL PROTECTED]>
>
>Sent: Saturday, 2003-01-25 20:46
> >Subject: [USMA:24630]
Programmable Thermostat
> >
> >
> >> The
programmable thermostat for my heating and air conditioning
> >just
died.
> >> In diagnosing that it was indeed dead, I unclipped it
from its
> >base on the
> >> wall and discovered, to my
chagrin, that I could have set it for 24-hour
> >> clock and
Celsius. (The previous owner of the house had told me that it
>
>was
> >> 12-hour clock/Fahrenheit only.)
>
>>
> >> I replaced it with the current equivalent model and
set the jumpers as I
> >> should have done on the old one.
>
>>
> >> It's a Lux TX500, available at Home Depot. The old
one was a Lux
> >TX1000. I
> >> noticed that the other
Lux models don't have the dual unit capability. A
> >> Google
search (using Lux and thermostats as the keywords) didn't reveal
>
>the
> >> manufacturer's web site, but I now know it's
http://www.luxproducts.com.
>
>(I
> >> suspect they haven't bothered to submit their URL to
any of the search
> >> engines. They do have a good range of
keywords on their home page.)
> >>
> >> Bill Potts,
CMS
> >> Roseville, CA
> >> http://metric1.org [SI Navigator]
> >>
> >>
>
>
>
>
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