Honeywell WIFI Thermostat

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Old 07-16-2019, 09:51 AM
RobertWR RobertWR is offline
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Default Honeywell WIFI Thermostat

My home in TV was built in 2013 and the original thermostat has 2 wires connected with a total of 5 wires coming into the back plate.

I am wanting to install the Honeywell model number RTH9585WF.

Has anyone done this? If you could tell me how you connected it I would greatly appreciate it.

Thanks.
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Old 07-16-2019, 10:09 AM
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I would suggest calling the manufacturer of your A/C unit to see if the proposed thermostat is compatible, or see if the thermostat manufacturer has a list of compatible A/C systems. The thermostat manufacturer should supply a suitable wiring diagram with their unit.
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Old 07-16-2019, 10:14 AM
Altavia Altavia is offline
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If unable to follow the instructions, maybe these will help.

Honeywell Smart WiFi Thermostat - Setup and use - YouTube

Honeywell Home WI-FI Smart Color Thermostat(New Model)! Unboxed Reviewed & Install😊 Smarthome Must - YouTube

One of the wires probably needs to provide continuous power but may not be connected in an older home. So may need a HVAC person to help with that.
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Old 07-16-2019, 11:30 AM
PaulDenise PaulDenise is offline
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On older units, the 5 wires are connected to do different functions on the hvac unit. Now, just 2 wires talk to a computer module back near the unit. They probably just used 5 wire line because they had it and it was the right gauge.

I tried to put a wifi thermostat in my 2014 house and found this.

If you look in the hvac room off the garage, you will see similar 5 wire lines running to and from the “furnace” and a small box on the wall. Inside that small box is the computer/ controller module.

To make a long story short, I gave up trying to connect a new wifi thermostat to the heat pump because of this issue.

I looked on the Carrier website and could not find a wifi thermostat that would work with the module.
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Old 07-16-2019, 11:54 AM
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Label the wires based upon the terminals they are connected to, such as common, red and so forth. Connect to the new thermostat which will have the same nomenclature.

The fifth wire, if unused is the outside temp sensor.
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Old 07-16-2019, 01:22 PM
Rango Rango is offline
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The wifi thermostat requires a wire for power that regular thermostats don't require. It's called a "C" wire. It provides 24 VAC to thermostat. My unit did not have the wire. Had an HVAC guy run a wire from furnace to thermostat
It was explained in the instructions that came with my (Honeywell) wifi thermostat or GOOGLE it.
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Old 07-16-2019, 01:31 PM
RobertWR RobertWR is offline
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Thanks guys for sharing your comments.

Rango could you forward your HVAC guy who ran the wire for you?
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Old 07-16-2019, 01:38 PM
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We installed a HoneywellT9 Smart thermostat and we did not originally have a “C” wire which you have to have for a smart thermostat. My husband ran a new “C” wire he bought at Homedepot and used the existing wires to get through the wall to the furnace, instructions were on google. It took him 20 minutes and neither of us have ever done furnace etc work before. Everything is working fine but there is a geofence which restricts how far we can be from the house to adjust the temperature. Now we have to figure out if we can increase the distance of the geofence.
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Old 07-16-2019, 02:12 PM
Rango Rango is offline
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Quote:
Originally Posted by RobertWR View Post
Thanks guys for sharing your comments.

Rango could you forward your HVAC guy who ran the wire for you?
I had it done in my home in Maryland.

I have used Chuck Farrell here in TV. You could check with them
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Old 07-16-2019, 04:52 PM
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Let's correct the wrong information that has been posted so far.

1. You do not need to string a new c wire as there are adapters that avoid that expense: https://www.amazon.com/Venstar-ACC04.../dp/B07RY3QG8J

2. Not all wifi thermostats require a c wire at all. Here is a highly rated, fairly inexpensive model: https://www.amazon.com/Emerson-Therm.../dp/B01NB1OB0I

3. You do not need to hire someone to do this, it is quite simple.
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Old 07-16-2019, 05:11 PM
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We are talking about a Honeywell smart thermostat, no?
Well, if you google: Do you need a C wire for a Honeywell smart thermostat, the answer is:
“The C wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. ... If your system doesn't have a C-wire, you'll need to run a new cable from your furnace to your thermostat to install most of the modern smart thermostat models. Thermostat wire is just a big spool of bundled, color-coded wires.”
And the above poster is correct, you can buy the adaptor instead.

Last edited by Velvet; 07-16-2019 at 05:18 PM.
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Old 07-16-2019, 07:12 PM
n8xwb n8xwb is offline
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I replaced our Trane thermostat with a Honeywell RTH6580WF wifi thermostat a couple years ago. My home in TV was built in 2006. As I recall I simply followed the instructions. I didn't have to run extra wires as there were extra wires not being used already in place. Sorry I can't recall the specifics, but if I could do it it must have been very simple, lol. Oh, FYI we have a Trane air conditioner and gas heat. Good luck!
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