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2003-01-26
Bummer! There is no screw. I must have an
older version of that model.
There is a space and one can see the PC board through the
hole. It appears there is a spot for a jumper (J8). The jumper area
consists of 3 holes, the top two have a resistor soldered between them. I
could not see the markings on the resistor because it was dark in the hole and
the resistor was standing up (mounted Japanese style). If I'm lucky what
is soldered there is a 0 Ω resistor ( a fixed jumper).
All I would have to do is use some dykes and snip the lead. If that gives
me degrees Celsius I'm in luck. If not, I will have to solder the snipped
lead back together.
John
----- Original Message -----
Sent: Sunday, 2003-01-26 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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