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Novice here and changing a thermostat. Have a Carrier FA4ANF048 system. Changing from an old circular thermostat to a Honeywell RTH7500. First, is this a heat pump system? Wiring is attached differently if it is and (we're renting) not sure if this Carrier system is a heat pump system. Most web material makes me think it is.

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  • Danny Clark
    Danny Clark May 11, 2010

    What color wires were on the old thermostat, and what terminals were they attatched to?

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  • 12 Answers

Return t-stat for another with o/b terminals

Posted on Jan 21, 2009

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How do you change batteries in thermostat RTH7500 series?


Grasp thermostat and pull straight out. Comes off mounting bracket. Here's manual
https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1899EF.pdf

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Heat pump -> installing digital thermostat.


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I need to reset the date and year


Hello,

I had exact same problem with RTH7500. Did not set the date properly at the beginning and than realized that there is no menu option to change the date after it is saved once (???!). I was very confused for few hours and wandering - trying to find changing option on thermostat menu; than I was looking online what can be done... I could not find solution...

Than I took out both AA batteries, open the thermostat (be very careful while doing this - you don't want to break plastic peaces that hold the thing together) and took out the button battery thinking that this will reset the thermostat... but it did not.

I repeated the same thing, but this time, while the button battery was out, I put two AA batteries back and this reset the thermostat... the old - blinking date appeared and I was very happy to see this on thermostat screen! This time I set the time properly and it works fine.

:)

Hope this will be helpful if you did not solve the issue yet... if you did, someone else might find this solution useful.

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Assumed all the wiring are correct,

to change from manual switching from heat to cool, press [system] button ( left ) to go into system setting.

then press and hold the [fan] middle button untill option display 120

use up down button to select option 300 ( Manual/Autochangeover) ,

select 0 for manual, 1 for automatic. ( read caution in page 22 of installation manual )

Good luck

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1 Answer

Replace Carrier tstatccshp01 builders standard thermostat with Honeywell rth7500 series and wiring not matching Does O wire go to Aux..? fan working but no cool air.


No... Aux. is auxiliary heat strip. This is usually a white or black wire its up to the choice of the installers preferance. O or orange wire. is used to the reversing valve on a heat pump. If you do have a heat pump there is a programing section inside the Honeywell t-stat. which should say heat pump or straight cool, then another section that will ask if you want the reversing valve to energize in heat or cool. most Heat Pump brands energize in cool the exception is Rheem and Ruud they energize in heat.

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