How do i hook up a thermostat

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How do i hook up a new thermostat

this is not only for your safety but also to keep from blowing the transformer. individual thermostat model information is most likely the best place to find particular manuals, and not a general manuals category that can be found within the search function. to wire a thermostat for a furnace and ac unit!, this is what you might expect to see in terms of colored wires and what they mean:White – the white wire is what connects to the (auxiliary) heat on your system. sure to see my low priced thermostat store (lowest on the web). this will keep the wires from falling back into the wall. however, there is an occasional oddball who knows better than everyone else.: for specific thermostat model installation manuals and wiring instructions, refer to our thermostat buying guide for a complete list and link of manufacturers. the people that were unsuccessful wasted part of their day, ruined a thermostat or two and caused the malfunction of an integral part of their system. the contractor who installed the system probably used 5 wire or 8 wire thermostat wire bundle. a situation where the original thermostat wires may have been stapled to an interior wall stud, and not run through conduit, you may be better off leaving the existing set of wires, and cutting them off at the entry and exit points of the wall. for both the condensing unit and the air handler/furnace/or boiler. additionally, make sure that none of the bare wire is touching anything except the terminal. or do i need to test and find hot wire? however, your system may not be common and different colors could have been used. one comfort to know is the basic wiring hasn’t changed much, with exception of an additional wire to get some programmable digital thermostats operating. and if so, would it save me a headache to run a bundle with more wires in case i install an air conditioner in the future? you're changing your old style thermostat to a programmable type, then most hvac systems are compatible and will work just fine with a programmable unit. then go to the unit to make sure it is not on. then feed new wires with a fish tape (klein tools).: electrical hazard – always turn off power via breaker or fuse box to avoid injury. fireplace embers, coals, and lava granules help create a realistic and appealing look for gas. march 14, 2016 at 10:35 am i have a separate boiler and ac unit.

How to Wire a Thermostat | HVAC Control

How do i hook up a thermostat

in a few basic jewelry tools doesn’t have to be expensive, or designated for valuable. some modern digital thermostats will not have an anticipator setting. with the many brands and models of thermostats existing, along with the numerous issues that could arise with corresponding devices, we suggest contacting the thermostat manufacturer technical department or have a professional local service tech do an inspection of your system if not operating properly. you will need:a small straight-slot (or flathead) screwdrivera small phillips screwdrivera pair of needle-nose pliersa utility knife or wire strippers (for small wire)plastic wall anchors (sometimes provided with the thermostat)a drill with a bit to make the holes for the plastic wall anchorsa small leveltwo pencils or pensa small paper bag and some masking tape. you will have to determine this before you start disconnecting any of your thermostat wiring. if any of the old paint is going to show you may want to make some touch ups now. (and more about thermostats, thermostat wire, and installing a new thermostat)some thermostat wire diagrams at the end of the articlelots of comments from our readersdon’t forget our hvac tips in the footerhow to wire a thermostat. of the biggest complaints, or rather, reasons for confusion i have come across is down to the fact that many thermostats on the market don’t work if your system isn’t equipped with a ‘c’ (common) wire. and let them offer a solution but i’m sure it can be done. august 14, 2016 at 8:22 am ok, i have a thermastat that has only 3 wires, 1 black, 1 red and 1 white. the basic heat + a/c system thermostat typically utilizes only 5 terminals. this is the color that controls the fan or the relay that control of the blower. to wire a thermostat - installation tools & stepsthese are the four wires that you need to control the heat, cooling and the blower or fan. if the temperature keeps falling below the set point then w2 would kick on and the same between w2 and w3. purpose of this site is to help people go beyond the thermostat. touch up paintclean hands (don’t do a great job changing the thermostat and leave all those prints all over the wall)plenty of lightthe power = no electricityturn the power off to the air conditioning and heating unit at the circuit breaker or the emergency cutoff switch. plus, i’m anything but a technician so what i have detailed below is here purely as a guideline. probably best to call a professional to hook this up for you as it is difficult to say without looking at the system you have and how it was wired. some people like to loop the wire around the terminal screws. you don’t want to start over, if you come up short. may also have up to two black wires as well but these are used for various heating systems in the north or for outdoor purposes, so for most of you these won’t need any attention. just take a look at the picture below the diagram. tighten these screws and check to make sure the heat anticipator is set properly.

Wire A Thermostat

cooling anticipators are often on the sub-base and are non-adjustable. if you're changing a heat pump system thermostat to a programmable thermostat, be sure that the new thermostat is compatible with your style of system. this is a show and tell video, i am showing what each white wire is a heat call yellow wire is the compressor, green wire is the indoor air handler fan, orange wire is the reversing valve, red wire is hot wire coming from transformer blue wire is common.. honeywell prestige wiring requirements) need a minimum of 5 wires, and maybe more depending on what features you want to operate (humidifier, etc). if you have a phone number for the manufacturer of the furnace i would call them and ask them about it. so, do i need to get a new one like that? into your furnace may sound intimidating, but if you have the basic knowledge of wiring, and know how to remove the proper furnace panels to access the electronics, then you should be fine. you can pick up multiple bundled thermostat wire at your local hardware store. does it matter which wire i put into r and w, both same and not marked.: a previous installer may have used a different set of color wires.: this article provides the basics of what to expect and look for when wiring a new or existing thermostat. what is necessary is that the wires are attached to the terminals and they are tight. december 15, 2016 at 9:51 pm there are three stage heating thermostats you can purchase that have terminals w1, w2, and w3. to wire a thermostat - anchorsit is important in this step to have the proper drill bit size. sometimes there is just enough wire to reach the terminals and that’s it. when you get the sub-base off wrap the wires around the pencil or pen. since i plan to replace it with the same type model. to the thermostat rh or thermostat rc terminal with a jumper wire between thermostat rh and thermostat rc. would highly recommend that you write down what color wire is going to which terminal. get the level and make sure the sub-base is level. the com 24v terminal will be connected to the c (24 vac common) of the thermostat. or are there thermostats that can control the 3-position gas valve? can send you a wiring diagram of how this is.

Honeywell Thermostat Wiring Instructions | Diy House Help

and it has been recorded by a professional in the industry. they can quickly identify what you have and wire it properly for control. a programmable thermostat can save you as much as 60% off your heating bills. this could save you a lot of unnecessary expenses in the long run. do you have an air conditioner with a gas furnace? pivoting glass frameless shower door will have a removable and replaceable door sweep along the. some are successful at changing the thermostat and some are not. electronic thermostats are no different from any other technology, in that they can do more, but can also seem complicated to install and understand. additionally, see thermostat wiring color code chart to help with how to wire a thermostat. (i) use any object larger than the hole in the wall, and tie or fasten to the end of your new wires, so you don’t pull all the wire through the wall. i recommend the wall anchor kits with the bits in them. the transformer powers the hvac control circuit including the thermostat. try pulling the wires a bit to see if there is more wire behind the wall. click here for instructions on how to enable javascript in your browser. the wires from the pencil or pen and run them through the center of the sub-base. heat pump systems work entirely different from standard hvac systems and require more circuits. A step by process made easy to understand Air conditioning Thermostats. sometimes this is true but often it is something entirely different than the thermostat. the new sub-base and compare it to the old one. to wire a thermostat - selecting the proper tstatac split or package system with gas, oil, or electric heathoneywell touchscreen thermostatthe first thing you should do before changing the thermostat is to select the proper thermostat for your system. setting the heat anticipator is important for your heating system. if the hot wires comes from the cooling system then you should use that common. and troubleshooting thermostat - heat cold air condition ac howto hvac wiring furnace.

How to Replace a Thermostat (with Pictures) - wikiHow

the red wire is the source hot wire from the transformer. you mentioned that some older tstats may have just an r and w wire, and therefore a new digital tstat may require new wire to be run (a bundle containing a c wire). the w, y and g terminals should be pretty straight forward on most all types of thermostat's. of course w1 would be low, w2 would be medium, and w3 would be high. october 29, 2016 at 1:12 pm first you need to figure out if it is line voltage (120+) or control voltage (24v). the wire used for heat is typically going to be different for the wire used for cooling. if the thermostat calls on w3 then you would have all three energized and that may cause problems with the furnace controller. even the most seasoned people who enjoy diy may come across problems with wiring a thermostat. if it is line voltage you need to purchase a line voltage thermostat and follow the instructions. the wires going to the condensing unit are shown as red and white. most thermostats have built-in screws while other simply snap in place. these thermostats, whichever type of thermostat or thermostats you have, require little maintenance. now looking at the various pieces of the existing one, the front is a ‘common round dial one’ which attaches to the ‘base plate’ with a few screws and the ‘base plate’ has copper trace lines within it. any products which contain mercury are illegal to sell now. additionally, for heat pumps, there are different controls, and wires for these controls run into the thermostat, they are multi-colored thermostat wires. however your connections may seem a little different on the thermostat itself. on aug 7, 2013explaining to home owners or do-it-yourselfer's about thermostat wiring. with two different thermostats it is easy to have both systems running at the same time which is a waste of energy., there are state and federal laws that are explicit about properly disposing of hazardous waste including products containing mercury. if you do need additional wires, you will want to consider how difficult installing new wires will be for your application, and if you need to budget for an electrician or hvac tech to install the proper wiring. you begin - how to wire a thermostathelpful page to help you select the right thermostat (opens in a new window)honeywell thermostats available herethermostat wiring and installation advisory………. older mechanical thermostats contain mercury and mercury is extremely hazardous to human health and our environment. once the wires are attached you are almost finished completing the task of installing the thermostat.

Nest Learning Thermostat - Install & Explore | Nest

because some people believe the only problem is with the thermostat. this allows 3 heat settings (low, medium, high) with gas control by a standard remote control valve co. most of the time there is some slack and you can pull the wire out more. start and check the heating, air conditioning, and with the heating and air conditioning off, the fan only sequence. you decide to install your own thermostat you do so at your own risk. you begin to install your new thermostat turn the power off. it must be level or the mercury switch will not keep the proper temperature settings in the house. question: i have a split system (hydroair for heat, compressor to air hander for ac). a Thermostat, How to wire a thermostat, I will show you basic thermostat wiring, thermostat color codes and wiring diagrams. they will be happy to accept your old thermostat and dispose of it properly. december 3, 2016 at 8:27 pm we have an article here concerning this matter and you can find it here – 1 or 2 transformers. it sounds like that is a heat only thermostat and you either don’t have air conditioning or if you do it is on a separate thermostat. make sure you kill the power to the system before doing any wiring and if in doubt call a professional hvac contractor to do it for you. one is for cool and the other is for heat, hence the abbreviation “rh” and “rc”. december 17, 2016 at 6:38 pm i have an old wiring diagram of a push button set up. you are the proud owner of a brand new, properly installed thermostat final adviceadditional answers to your questions concerning thermostats can be found here in our thermostat category index. so if it comes from the boiler or furnace (whatever heating system you have) then the common should come from there also. a comment, tip or problem your having with diy electrical. when you are sure that it is level, tighten the screws. and the possibility exists that the thermostat will fall off the wall.) mark the new holes through the sub-base where the screws will go into the wall to fasten the sub-base. the bit should match the size of wall anchors you have. to Wire a Thermostat - Your thermostat or programmable thermostat is an integral part of your comfort system.

How do i hook up a thermostat-Thermostat Wiring for Dummies – How Anyone Can Do It

Control thermostats with the Google Assistant and Google Home

do i need to run wire that has w, r and c?’d like to convert from the push-button switch to a thermostat, preferably a programmable but at least the “new round” honeywell (not the digital). i typically recommend that the two thermostats be combined into one thermostat that will handle both systems if in fact you do have a central air conditioner system. push it in until just the lip of the anchor remains visible. the other wire originates from the common side of the transformer. cooling anticipators are not adjustable where heat anticipators are adjustable in mechanical thermostats. just make double sure that you have killed power to the unit. however, only if you are replacing a mechanical thermostat with another mechanical thermostat. likewise, the push-button switch has 4 wires: the other side of the xfmr, +3 wires for each position setting (obviously same wires as connected to the gas controller)., be aware that thermostats are equipped with heating and cooling anticipators. is not mentioning the fact that they ended up calling a professional hvac technician to fix the problems. thermostat or programmable thermostat is an integral part of your comfort system. often, i find that the only thing people know about their ac and heating systems is how to turn the thermostat on and off. if the thermostat instructions say nothing about the anticipator don’t worry about it. after finishing with that, put the new sub-base back on the wall in the position you want it. it should have the same setting as the old anticipator setting. july 1, 2016 at 4:01 am before seen ur site i haven’t any knowledge about package unit and about thermostat.: i installed my new programmable thermostat, but it won’t turn on. i would like you to know is the information detailed below is based on the industry standard, yet not all thermostats will work this way simply because letters and numbers are used as well as color. with installationsthere are so many different variations to this high performance hvac will not attempt to describe them here. you probably want to do this now before you proceed further. finally, additional information on products containing mercury can be found on the epa website. the thermostat circuits i will be covering will consist of the two scenarios i mentioned above.

Learn how to control your Nest Thermostat with Amazon Alexa on

or perhaps the wiring color combination was not available for the new installation. be careful not to allow the sub-base to move when you are tightening the screws. they used what they needed and simply twisted or cut the other wires off. following image is one of the most popular scenarios today. in the market for a new honeywell thermostat, make sure you understand your honeywell thermostat wiring needs before upgrading. do i have to just pick one of the gas settings (low/medium/high) and just use that one? to make a c wire should i use the transformer in the air handler? if you are replacing a mechanical thermostat with a digital thermostat, the digital thermostat should set itself automatically. if it is control voltage a typical home thermostat will work where you wire to r and w on the thermostat. drill the mounting holes you made for mounting the sub-base. be sure to take a very conservative measurement on how long your new set of wires should be. sometimes you will have extra wires that are not connected. the additional 5th wire will be for common; providing stepped down power from a transformer. autoplay is enabled, a suggested video will automatically play next. or i prefer to say in the morning because you can set it so the unit comes on just before you wake. each wire must go to the correct terminal on the thermostat or the unit will not run correctly. thermostat installation advice article (opens in a new window)thermostat installation advice - how to wire a thermostatthe bottom line advice to most people is to call an hvac professional if something is wrong. These thermostats, whichever type ofHeck, now i’m not calling anyone a dummy! – this wire connects to your heat pump (if you have one). it is very possible they have a solution for you. this will be a non issue to keep track of if a whole new set of thermostat wires is pulled. and procedures for installing the new thermostatbasic control circuits for hvac article (opens in a new window)pull the cover off the front of the thermostat. december 17, 2016 at 6:28 pm this is a gravity furnace that this set up will not work.

Thermostat C Wire: Everything you need to know about the

probably best to call an hvac contractor to wire this for you. once you have made the thermostat selection you can proceed to the next step. i get calls all the time to replace transformers because the homeowner changed the thermostat and didn’t kill the power. april 5, 2016 at 1:34 pm it is possible you could have two different transformers in that system so you would need a thermostat with an rc/rh termination in the thermostat. it's going to take a little research on the owners part to declare what is involved with your heat pump system and verify proper color codes. some wall anchor kits come with a bit in them. that is why i say call the manufacturer or a professional to make sure this won’t (or will) be a problem and find a solution to fix that problem. however, during the process they touched the wrong wires together and blew the transformer. wires pass through a floor and up into a wall cavity before reaching a thermostat. if the bit is bigger the wall anchor will not hold. the thermostat wiring on these systems can have very similar wiring properties. all these things are important to know before buying a new thermostat. to wire a thermostat - thermostat wiring diagramthis thermostat wiring diagram is for a split system. disposal installation and removal can be a straightforward diy project with the aid of an. be careful not to let the wires fall back into the wall. is the old paint that was covered by the old sub-base going to be covered by the new sub-base? proper settings ensure you will get the best out of your heating system and your thermostats. is set according to the amp draw on the control heating circuit. as far as the wires are concerned you will have to trace them out to see where they go. the common should originate from the same source transformer where the hot wire originates from. now most thermostat's will not have all of these termination points but the chart will help you determine color code and connection points for your particular unit. it really depends on how the system was installed and wired. sure the firebox is not cracked and the flue vent is venting properly before you start putting this type of money into this very old furnace.

Wire A Thermostat

it was replaced in the condenser rather than the air handler. pull the new set of the wires down through the wall from the basement. if it is the old round that is a mechanical thermostat you cannot purchase them any longer. w1 would kick on when the temperature need to turn to satisfy the set point. (or if they didn’t match, the color markings you made with masking tape). contact a certified electrician or hvac tech if unsure of your diy capabilities. we will describe the common type (at least for this region (mid-atlantic) and if you see that you have the system described you can proceed cautiously at your own risk. to wire a thermostat - removing wiresremove the wires from the terminals on the sub-base. the controller has 4 wires going to it: 24v direct from xfmr, +3 wires (one to each position terminal). i would like to install a new thermostat that is a wifi unit. i can send photos of the boiler and the old thermostat wiring. always keep in mind that who ever wired your thermostat may not have followed these procedures and your color codes will not match the following examples. and not just a dial on the wall that adjusts the temperature when they are not comfortable. diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. location - how to wire a thermostatin rare installations, the condensing unit will have the transformer. all other wires, except the common wire, controls a specific relay or contactor. only thermostat like that that comes to mind is the old honeywell t-87. parts will be needed to convert to a thermostat control. color codes may be different from one household to another, but generally the concept should be the same. approximately 1/16th of an inch on the lip of the anchor will remain sticking out of the hole. if this is the case the only benefit you will get from a programmable thermostat or thermostats is at night. the main trouble is dealing with those different colored wires, knowing which one does what and if that wasn’t enough, you also have numbers and letters to deal with. thermostat wire terminations should be neat with no excess copper exposedtools neededget the tools together that you will need to do a proper thermostat installation.

Honeywell Thermostat Wiring Instructions | Diy House Help

this way if your color codes don't match the normal code as the chart below indicates, you can still get a good idea of which wire should go where on your new thermostat. they go down to the local hardware store and purchase a brand new thermostat. the current control is a single push-button switch with 2 indicator lights. however, we’ll delve into the world of thermostats on this page and hopefully, this will help many people. Learn how to wire basic thermostats and digital thermostats to operate heat and cooling. i will explain that in a little more detail further down this page. the ones that are not successful end up calling a professional in to install a new thermostat. there are also many incidences where the homeowner was unsuccessful installing a new thermostat. otherwise tag the wires before removing from the existing thermostat, or take note of the terminals each wire is attached to. you are retired or if someone is at home during the day you likely do not need a programmable thermostat. these split systems include an air conditioner with a gas furnace, oil furnace, or electric furnace. however, i do not know if this would be proper for your situation because of how the 3 stage thermostat will work. shelving systems from closetmaid and rubbermaid can provide a variety of options, but rooms vary in size,. if not read the instructions on the new thermostat for instructions on how to set the anticipator. or red to the thermostat r terminal which is shared with both the heating and cooling. for more information please see hvac products containing mercury and proper disposal. any trash or dust will fall into the bag and not onto the floor.. i’m replacing an existing thermastat because they old one ‘broke’ (how ever they do). and disclaimer for installing a new thermostatlist of tools commonly needed to install a new thermostatstep by step instructions on changing your thermostat along with hints and tips for making the job easierlots of extra links to other articles to make sure you completely understand everything you need to know.: if you plan to upgrade to a new thermostat make sure you have the proper number of wires available, otherwise your new thermostat won’t work. february 12, 2016 at 4:59 pm if it is a 5 ton straight cool air conditioner then it does not have heat. searchhvac parts thermostats menu4 wire or 5 wire wiring problemall about thermostat wirebasic air conditioner wiring colorsblank display problem – screen disappeareddata loggersheat pump tstat wiring chart diagramheat pump thermostatshoneywell chronotherm plushoneywell visionprohow a programmable tstats workshow can i tell 1 or 2 transformers for heating cooling systemhow to hook up a home tstathow to wire a thermostathow to wire an air conditioner for control – 5 wireshvac products containing mercury and proper disposalprogrammable tstat wiring diagramsrunning new wiresilverpac silverstat 7 advancedsuccessful installation advicethe mercury switch tstatselection guideterminal designations explanationsthermostat wiring colors codewiring diagramstroubleshooting broken thermostatstypes of hvac tstatsvenstar colortouchwhat temperature should i set my programmable towhite rodgers & honeywell selectionwiring a programmable for geothermal heat pumpwireless wifi smarthvac stuff here search for more! october 29, 2016 at 10:35 am my gas floor heating system is a off-on handle system.

the red wire or 24 vac power lead is connected straight to the rc & 4 terminals. to wire a thermostat - the colors and terminalsunscrew the thermostat from the sub-base. provided wiring diagrams are based on the nutone 2-note door chime, but the common wiring. colors and terminals on the new tstatusing the color code of the thermostat wires, attach each wire to their proper terminal. if the colors of the wires do not match the colors described here make sure you mark the wires with masking tape. becasuse i have these two heating units running on a same open space. however, they can be different depending on who wired the unit and their color coding system. unscrew the sub-base from the wall while holding the wires. additionally, some thermostats do not have screws holding the thermostat to the sub-base. sure to check out my thermostat store for great bargains on all types of thermostats. an improperly set anticipator will cause your furnace or heater to run improperly. and foremost when you go to wire a thermostat, if you have any doubt of the type of hvac system you have and are uncomfortable with wiring, then i highly recommend using a qualified hvac service technician to complete your task. december 11, 2016 at 1:48 am parents house has an old superior gas furnace (by pacific gas radiator co. but an important issue here is that the diagrams and wiring color codes are going to be the most common standardize method. to wire a thermostat, you must first be aware of the type of system that you have in your home. this type thermostat is relatively easy to connect or change over to a programmable type thermostat. make sure to tape completely over the wire ends, so no edges are present that can snag something. thermostat wiring - wire programmable thermostats - heater air conditioner hvac furnace. check your local home improvement stores, or local tool rental, for rental availability. please do not throw the old thermostat in regular waste bin. the manufacturer did not install the transformer in the condenser. these types systems are more involved because of the components associated with the system. once that is verified, the owners manual should be informative enough to complete the change over very easy.

may 12, 2015 at 3:24 pm c refers to common in the 24 volt circuit and on the old mechanical thermostat i am not sure what the c stands for but you do need three wires and yes it would be better to run a bundle of more in case in the future you upgrade. factor this into your decision and if there is any doubt call a professional. use the search feature to the right to help you find other related articles. to insulate attic hatch panels is easy and effective with rigid foamboard and a few. the following list should match the wires and terminals on your thermostat. insert the wall anchors and push them hard with your thumb. you have easy access to the existing thermostat wires, just remove and follow the same path with the new set of wires. those that are most likely read some thermostat installation directions or had someone read the thermostats installation directions for them. problem with the staging thermostat is that w1 would still be energized when w2 calls and your controller may not allow that. and you may exasperate the problem which will cost more in the long run. never reading any thermostat installation directions, they proceed to change the thermostat. but in the case of a heat pump system, you'll really have to do some research to verify that the programmable thermostat will work. you’re still a little confused (and i can understand why you would be), i have added a thermostat wiring made simple video for you to look at which isn’t very long but is one of the best explanations i have come across. additionally, if you have a multi-zone system, a high-efficiency heat pump or even just a heat pump, a regular split-system ac and a boiler for heat (and you have one thermostat), or an apollo based system (hot water heated in a water heater) with a split ac system……. other questions about a honeywell thermostat, honeywell thermostats, programmable honeywell thermostats can be found at the honeywell thermostat website. to wire a thermostata very common occurrence with service calls is the complaint that the thermostat isn’t working properly. my old tstat has simply a w and a c (black) wire. these components will energize the fan, heating, or cooling depending on the selection. hold it up to the wall in the position you want it. to wire a thermostat | hvac control by high performance hvac | thermostats | 21 commentswhat you will learn from this how to wire a thermostat article:the most common trouble call by service and repair hvac companiesabout thermostat wire with a resource for more informationthe best advice for changing your thermostatthe most common mistakes made by diy thermostat changersthe importance of identifying the type of hvac system you have so you will select the proper thermostat. i will describe the advantages of the programmable thermostat in full detail in a different section below. if it is a mechanical thermostat there should be a little adjuster tab in the center of it. some thermostat units have a dedicated r terminal and it jumpers to the rc, rh or 4 terminals internally.

if it is more than that use the butt-end of the screwdriver. way the house is at a comfortable temperature when you get out of bed. you can use cable ties, electrical tape, or staples (securing wires and cables article). call a professional to install and wire the new thermostat. pagelegal-disclaimersite mapadd/see comments2-way switch3-way switch4-way switchdimmer switchoutlet/receptacleceiling fansgarden lightsthermostatsdryer cordsdryer outlettrailerscomputersrelayshome theaterdiy storesrelated linksfind an electricianlink to usabout sbiabout mecontact me. this video for assistance on upgrading or installing a programmable thermostat. following is a chart showing the most common terminals and their respective color codes and what that particular wire is used for in the circuit. if your thermostat does not have a y1 and a y2 then then you can stage it. thermostat disposal - how to wire a thermostatalways keep in mind to properly dispose of hazardous materials responsibly. as mentioned in the previous paragraph, the only difference might be the lack of an "r" connection. so, i have two transformers, one in the air handler, one at the boiler. to wire a thermostat - diagramsmore about thermostats hereyour resource for hvac thermostat wiring information – how to wire a thermostat. after doing that make sure the power is off by turning the thermostat to the on position. with that combination you describe it is probably best to call a pro. march 23, 2017 at 2:55 pm we cannot use one thermostat to control two different heating system which were controlled by two different thermostat. a step by process made easy to understand air conditioning thermostats. the following image here represents a heat pump system thermostat. remember to set the new thermostat to this same setting. (i) a simple trick for pulling new wires to replace existing ones: tape one end of the new wires to the end of the existing wires coming through the electrical box or wall opening. one wire originates from the thermostat y terminal and terminates at the condenser. but what if you have a system that's a little different like a heat pump system, then your thermostat is going to be wired a little different as well. the wire running to the thermostat seams to be from the ac unit not the boiler. the unsuccessful end up paying three to four times what they would have paid if a professional was called first.