poltava...
That actually isn't a simple question to answer, or at least it's
not simply answered with what's readily available on the Honeywell
website. I replaced my regular thermostat awhile ago, and ended up
having to return one, having not read the fine print on the back
of the package indicating whether the Honeywell programmable I
bought was compatible with a heat pump system.
You're right to pick Honeywell, though. I researched digital
thermostats before replacing mine, and Honeywell stomped the
competition in being able to keep the temperature within 1
degree of the setting chosen. Others were considerable less
accurate, which I found when I bought another model *before*
researching accuracy. That one went back, too.
The thing is, there are innumerable late-model Honeywell
programmable thermostats which will work to replace your
current thermostat, as we shall see.
Searching Honeywell for the CT51A, I found the following:
CT51A1019/U Product is not available on-line.
Please call Customer Care for more information.
CT51A1035/U Product is not available on-line.
Please call Customer Care for more information.
CT51A1035/K Product is Obsolete. Click on the product
number to find a current replacement for the product.
CT51A4443/T Product is Obsolete. Click on the product
number to find a current replacement for the product.
CT51A4773/T Product is Obsolete. Click on the product
number to find a current replacement for the product.
http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=Search&Catalog=&ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D&ReturnUrl=http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=AdvancedSearch%26ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D
Clicking on the product numbers that offered that option
returned "no results found":
During the weekly business hours, you may be able to talk
to a live customer representative at the following Honeywell
Customer Care toll-free number: 1-800-468-1502, but after
reading this answer, you may not need to.
Honeywell's own site simply narrows down to 7-day, 5-2 day,
and 5-1-1 day programmable thermostats on the following page:
http://yourhome.honeywell.com/Consumer/Cultures/en-US/Products/Thermostats/Programmable/Do-It-Yourself/Default.htm
You then select one of those, depending on whether you want
to be able to program every day of the week separately, the
weekdays and the weekend separately, or the weekdays, Saturday
and Sunday separately.
If you picked the 5-2 day, you end up on this page:
http://yourhome.honeywell.com/Consumer/Cultures/en-US/Products/Thermostats/Programmable/Do-It-Yourself/5-2/Default.htm
...with an offer to find a retailer, rather than any discussion
of available model numbers. Since you can't order directly from
Honeywell, you're pretty much stuck with what's available at
Home Depot, Ace Hardware, or other retailers, anyway. A trip to
them will let you see the actual packages, which can help you
decide which ones will work for you. But we can give it a go
here, too.
So lets go to Home Depot online. They indicate having two
Honeywell programmable thermostats on the following page,
a 5-2 day, and a 7 day:
http://www.homedepot.com/prel80/HDUS/EN_US/diy_main/pg_diy.jsp?CNTTYPE=PROD_META&CNTKEY=misc%2fsearchResults.jsp&BV_SessionID=@@@@1377172799.1140909891@@@@&BV_EngineID=cceeaddhdljfdhhcgelceffdfgidgnl.0&MID=9876
Now we can go to the product search page on Honeywell:
http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=AdvancedSearch&ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D
This is the result page for RTH6300B, the 5-2 day model:
http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=Search&Catalog=&ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D&ReturnUrl=http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=AdvancedSearch%26ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D
This gives a long list of models with that number, and
the familiar message:
"Product is not available on-line. Please call Customer
Care for more information."
However, we can plug the same number into the
'Literature / Image Search' box at the bottom right,
searching 'All Literature' for 'Model/Part Number',
and we get this page of related PDF files for that model:
http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=Search&Catalog=&ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D&ReturnUrl=http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=Search%26Catalog=%26ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D%26ReturnUrl=http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=AdvancedSearch%26
ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D
The first one, 67-5102, the 'sell sheet' gives the specs
for the product, noting compatibility for the following
systems:
quote
UNITED STATES CANADA
24-Volt Heating and Air Conditioning Systems: RTH6300B
Single Stage Heating and Cooling Yes
Multistage Heating and Cooling No
Heat Pump without Auxiliary Heat Yes
Heat Pump with Auxiliary Heat No
Gas Fireplace (24 Volt or 750 Millivolt) Yes
Electric Baseboard Heat (120-240 Volts) No
Central Air Conditioning Yes
Heating Only Yes
Cooling Only Yes
Hot Water Yes
Steam or Gravity Yes
750 Millivolt Yes
Furnace (Warm Air) Yes
unquote
http://customer.honeywell.com/Techlit/Pdf/67-0000s/67-5102.pdf
Since this is a thermostat which is able to handle up to
6 wires, and all but 3 of the systems above, and your
current thermostat has only 4 wires, as noted in PDFs
below, chances are it will accommodate your system,
unless it is Multistage Heating and Cooling, Heat Pump
with Auxiliary Heat, or Electric Baseboard Heat.
If we explored the literature for the 7 day programmable
available on the Home Depot page, I think we'd find a
similar degree of compatibility.
Also available on that RTH6300B PDFs page are the
installation guide and owners manual, in various languages.
Here are the PDFs for your current thermostat, should
you need them:
CT51A Product Brochure PDF:
http://customer.honeywell.com/Techlit/Pdf/50-0000s/50-8901.pdf
CT51A Installation PDF:
http://customer.honeywell.com/Techlit/Pdf/69-0000s/69-0265ES.pdf
Page with C51A PDF files to download:
http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=Search&Catalog=&ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D&ReturnUrl=http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=Search%26Catalog=%26ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D%26ReturnUrl=http://customer.honeywell.com/Honeywell/CatalogNavigator.aspx?Definition=AdvancedSearch%26
ChannelID=%7B19E09D82-D02E-440F-A296-07BE5D203786%7D
Aha! I did manage to find a page on another part of Honeywell's
vast site which presents various digital programmable thermostats
for your consideration:
http://customer.honeywell.com/Honeywell/UI/Pages/Catalog/ComponentCategory.aspx?Catalog=Homes&Category=Digital+Programmable_2034&ChannelID=%7b2EB2F178-20ED-44E0-97FB-CCFB4218DD64%7d
However, you'll note the that RTH6300B that we found available
at Home Depot is not listed on the page, and none of the ones
listed on that page are seen on the Home Depot site, so you're
still likely stuck with what you can find at a retail store of
your choosing. It's sort of a matter of picking the "flavor of
the month", since the retailers are selling what's in stock,
while Honeywell is cranking out newer models. Mine, a 5-1-1
programmable for a heat pump, is already listed as outdated
on the Honeywell site, though I bought it only about a year ago.
If all this hasn't made your task of selecting a replacement
more simple, feel free to come back with questions. Another
helpful tool is the Honeywell Thermostat Wizard, which can
walk you through wiring, programming and troubleshooting
your new thermostat:
http://yourhome.honeywell.com/yourhome/Applications/Wizard/Wizard.aspx
Please do not rate this answer until you are satisfied that
the answer cannot be improved upon by way of a dialog
established through the "Request for Clarification" process.
A user's guide on this topic is on skermit-ga's site, here:
http://www.christopherwu.net/google_answers/answer_guide.html#how_clarify
sublime1-ga
Additional information may be found from an exploration of
the links resulting from the Google searches outlined below.
Searches done, via Google:
CT51A site:honeywell.com
://www.google.com/search?q=CT51A+site%3Ahoneywell.com
programmable home thermostat site:honeywell.com
://www.google.com/search?q=programmable+home+thermostat+site%3Ahoneywell.com |
