Thermostat wiring color code decoded
Basic Non-Programmable Thermostat - RTHLB | Honeywell
With its time-tested comfort control, you will feel relaxed in your own home for years to come. Discover why this is the world's most popular thermostat. SETUP. Verify compatibility with your home heating and cooling system, remove your existing thermostat and follow step-by-step instructions for installation. The Honeywell. 2-Wire Honeywell Thermostats: How Do I Install & Wire Up a Room Thermostat like the Honeywell Round Wall T87F Series Thermostat? 3-Wire Honeywell Thermostats: Where Do We Connect the Red, White, & Blue (if present) Wires to a Typical Three-Wire Wall Thermostat? 6-Wire Honeywell Thermostats: Where Do We. Insert the wires into the corresponding terminals on the thermostat and tighten the terminal screws. There may be a metal jumper connecting the R and Rc terminals on the new thermostat. The manual will direct you whether to leave it in place or remove it. Wi-Fi thermostats may require a C wire. If you don't have a C wire.
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. This article gives a table showing the proper wire connections for Honeywell brand wall or room thermostats used to control heating or air conditioning equipment. Our page top sketch, courtesy of Honeywell Controls, illustrates the wiring diagram for a traditional Honeywell T87F thermostat used for 2-wire single pole single throw control of heating only in a typical gas-fired heating system.
Green links show where you are. Do not use C, C1 or X wire. Do not use B wire if you already have O wire. Wrap bare end of wire with electrical tape. This thermostat cannot please click for source used if your old thermostat had [and used] any two of the following wires: These thermostat T87F models vary by the operating temperature range they support and a few other simple features such as the presence or absence of a thermometer.
Functionally and for wiring they are similar. The [Honeywell Day Programmable Thermostat - RTHB] thermostat cannot be used if your old thermostat had [and used] any two of the following wires: Some thermostats will be supplied with a jumper wire or clip between the thermostat RH and RC terminal and will not provide a simple R terminal such as the 3M Filtrete. Connect the red wire to RH and leave the jumper in place.
Remember that ultimately a thermostat is simply an on-off switch, How Do You Hook Up A Honeywell Thermostat provides several on-off functions. But with multiple zone heat, you should expect to provide a thermostat for each individual zone - else they're not heating zones at all.
In a traditional hot water heating system that does not use the Azel i-Link controller, the first thermostat is wired directly to an aquastat that controls the first zone; the second two thermostats are wired to individual circulator relays if individual circulator pumps are used or to individual zone valves if a single circulator runs the whole system.
Where zone valves are used, an end switch closes to turn on the circulator a logical inclusive OR function with the other zone valves when the zone valve opens to allow hot water to flow. And the company makes clear that their controller is compatible with standard thermostats:.
ALL - controls are compatible with 2, 3 or 4 wire type thermostats. Calling Honeywell with the right product number Tel: Honeywell has done a great job making installation and operations manuals available for their equipment, but you've got to search with the right product number. Searching the Honeywell site for the corrected thermostat number delivers a single product that's probably yours, the Day Programmable Thermostat - RTHB In fact this thermostat is widely sold including at Home Depot stores, and I've installed and used this very model myself to control an add-on hot water heating zone and Taco circulator in an older home.
According to Honeywell, this thermostat is compatible with:. For your model you want Honeywell document ES - found at http: Here are details from that manual's instructions for wiring the Honeywell RTHB Day Programmable Thermostat beginning with the inspection of the existing wires:. Identify and label each of the existing How Do You Hook Up A Honeywell Thermostat wires by using not the wire colors someone could have made a wire color error and violated convention but rather, identify each existing thermostat wire by noting the letter next to the old thermostat wiring block terminals where each wire was connected to a screw.
Identify and label the wires that are connected as. If any wires are not attached to your old thermostat or are attached to a terminal marked C or C1, they will not be connected to your new thermostat. Wrap the bare metal end of each of these wires with electrical tape, so it cannot touch and short other wires.
Honeywell Day Thermostat Wiring Table: If the wire labels from your old thermostat hookup don't match the above, Honeywell offers additional advice that we adapt in table form:.
Be sure that you link the wires before disconnecting them from the old thermostat, or if you are installing new equipment, identify the incoming wires from the equipment terminals and its manual. Below are alternative wiring connections for the Honeywell RTHC thermostat along with an explanation.
Hi, I have a setup that I think is probably common, at least in the northeast, but that I found very difficult to get straight.
I have a boiler with a hydronic zone valve that controls two zones. The thermostat I was replacing was an old White-Rogers mercury switch.
It's a 3-wire configuration. The new t-stat is Honeywell RTH Both thermostats are wired into the hydronic valve. The valve connectors are click with numbers I had some trouble getting through to Honeywell support, but I finally succeeded in communicating with someone via the live chat they offer at the bottom of their help and support page.
Frequently Asked Questions (FAQs)
One tip before using that service: I never would have arrived at that on my own given the information in the t-stat manual and what I've found on the internet, so bravo Honeywell support person.
Thanks Ryan, that will help other readers. I'll keep your comment in our Honeywell Thermostat Wiring Instructions.
I previously had a Source1 tstat. I decided to upgrade to a programmable tstat. I went with the honewell TH The wiring was the same W to white, Here, and G- green.
There was an additional blue wire that was not used, but i needed now for the 24volt power. I hooked it up on the control board. Now, as soon as i connect the tstat, the blower kicks on. I have it set to auto. Even if i turn it off, it still runs.
If any wires are not attached to your old thermostat or are attached to a terminal marked C or C1, they will not be connected to your new thermostat. Some programmable thermostats e. This will be a non issue to keep track of if a whole new set of thermostat wires is pulled.
Only way to turn off the blower is to disconnect the tstat or unplug the blower. I turned the temp up to 80 in my house. Do these units take time to sync, or anything? Should i let it run longer? Or is my tstat defective? Click here hooked my old source1 back up and it is fine.
In the Honeywell TH installation manual, as I read source wiring instructions they expect the blue wire to be operating a reversing valve - for heat pumps. In the thermostat Custom Setup did you make sure that your thermostat is set for the proper type of heating system:. Each option offers different choices on the following screens.
Your forced air heating system type Select how your forced air system is powered: Touch the orange Help button on any screen for more information. Number of cooling stages Select 1 Stage default or 2 Stages. If you are unsure, note which wires are connected: Number of heating stages Select 1 Stage default or 2 Stages. Your fan control Select whether your thermostat default or heating system controls the fan. I f you are unsure, note which wires you have connected. Select 1 Stage default or 2 Stages.
Hello - I am replacing a round Honeywell thermostat with a non-programmable digital Honeywell unit. I have a hot water system with How Do You Hook Up A Honeywell Thermostat zones and with no air conditioning. There are three wires at the thermostat. On the old round unit the red wire went to the R terminal, the white wire went to the w terminal and a green wire went to B terminal.
I hooked up the new stat the same way but it would not work. If I selected "fan on" instead of "fan auto" the zone would heat up but would not shut off hot water kept flowing even if I selected a temp below room temp. Patrick, typically the three wire thermostat hookups would be exactly the same for the old and new thermostats.
I am replacing an old mercury thermostat with a digital. Many thermostat wiring setups are straightforward or "cookbook" but why not find the brand name on your thermostat and then you can obtain the installation instructions right from the manufacturer?
Be sure to take a very conservative measurement on how long your new set of wires should be. If any wires are not attached to your old thermostat or are attached to a terminal marked C or C1, they will not be connected to your new thermostat. Your "tracking down" suggestion is exactly what the Honeywell "help desk" finally offered when I called. How-To 11 months ago.
Also, Honeywell's thermostat replacement advice and most likely that of all thermostat manufacturers warns:. Do not put your old thermostat in the trash if it contains mercury in a sealed tube. Contact your local waste management authority for instructions regarding recycling and proper disposal.
June 11, I have a white wire but the new thermostat doesn't have a W terminal said: My old thermostat has this: I assume the orange wire goes to "O", but where does the white wire from "W" go? Aug 18, Robert said: Trying to replace a Honeywell model TC mercury stat for heat pump with new Honeywell programmable.
Honeywell "tech" line person could not help - said I would have to trace yellow wire back to the pump - easier said than done. Any thoughts what terminal on new stat would be compatible with old "P" terminal?
Robert, I can't know what your system's yellow wire is doing, but by generic color code convention. Yellow is for the switched compressor compressor control circuit - for more info conditioning or a heat pump.
Aug 21, Robert said: Dan Joe, thank you!!!
4 Wire Honeywell Thermostat Wiring
Based on your response, then, I "should" be safe in connecting this yellow wire to the "Y" terminal here the new programmable stat? Presuming "worst case" scenario to be heat pump would simply not work properly and I just live with old stat?
It is curious, tho, that old stat has a dedicated P terminal and none of new ones do.