Support- www.patreon.com/acservicetech Tool List- www.amazon.com/shop/acservicetech For those that are looking for the tools used in the videos: (Linked Below) UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ Valve Core Removal Tool amzn.to/2uYr8WL Blue Vapor Yellow Jacket Gauge- amzn.to/2Ju7pan Red Liquid Yellow Jacket Gauge- amzn.to/2sSFmGH Quick Coupler for the Gauges- amzn.to/2sTk8Ze JB Test Gauge High Side- amzn.to/2ruQb0l JB Test Gauge Low Side- amzn.to/2qR0utM Manual Copper Tube Swage/Expander- amzn.to/2WRPa1M Uniweld Hydraulic Swaging Tool- amzn.to/2MlrI8m Uniweld Swage and Flare Kit- amzn.to/2T55jyn Ameriflame Oxy Acetylene Torch Setup- amzn.to/2SRm3JF #2 Tip for Oxy Acetylene Torch- amzn.to/2SPDaeD Cap-N-Hook Tip for Oxy Acetylene- amzn.to/2MbhpUk Air Acetylene Torch Setup- amzn.to/2aQalsb 15% Silver Brazing Rods- amzn.to/2gVLyLc Nitrogen Regulator- amzn.to/2bXdR5f Nitrogen Flow Meter- amzn.to/2brvoBg NitroVue Flow Reg- amzn.to/2MiulYv Ultrasonic Leak Detector- amzn.to/2Lw4Zpr UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ Magnet Jumpers- amzn.to/2PyKPQZ Alligator Jumpers- amzn.to/2PxqJXn Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3 Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq Refrigerant hoses with valves amzn.to/2aBumVI Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9 Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4 FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6 Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8 QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg JB 6 CFM Vacuum Pump amzn.to/2nqbvo8 Appion Blue 3/8" to 1/4" Vacuum Hose amzn.to/2uYlVyc Appion Red 3/8" to 1/4" Vacuum Hose amzn.to/2uYg6Ro Appion Valve Core Removal Tool amzn.to/2uYr8WL Yellow Jacket 1/4" by 1/4" hose amzn.to/2umtcod CPS Vacuum Micron Gauge amzn.to/2v1nM3O Supco Vacuum Micron Gauge amzn.to/2v1JRiA RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn UEI DL389 Multimeter amzn.to/2xAdaJf Other tool links can be found in the video description section. Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- www.amazon.com/shop/acservicetech
AC Service Tech LLC sorry I can not find a proper place to send you a message or email. I’m a third year HAVC service tech in Cleveland. I have a request. Due to the fact that I can not find a good video anywhere for this. Can you please possibly make a video for steam boiler McDonnell Miller LWCO and auto feed. Diagnostics and schematic. Thank you so much. Your videos are very informative and we (younger techs ) appreciate you. Thank you.
this video just saved me a minimum of $150 to fix the wiring mistake that another company made if not the full 750 the original company quoted stating I needed a whole new board... for a wiring mistake they made... Thanks!
This video helped me tremendously in installing my new Nest learning thermostat. The wires from the thermostat I was replacing were not properly labeled and the original installation was performed without the common wire. I kept getting "No power to Y1". After following another video on TH-cam, I performed the G wire hack but then I got the "No power to Rc" message. I was about to throw in the towel and call a professional when I found this video. Through watching it, I was able to figure out that the wire with only two leads came from the outside and the other wire went to the thermostat. I learned the meaning of C wire, Y1, Y2, Rc, Rh, G and they were no longer just letters to me. I figured out which wire coming from the outside was the common wire, hooked up a common wire to go to the thermostat, fixed the mislabeled wires and the Nest was happy. Thank you so much for putting this video together!
As an electrician by trade and are working with an HVAC contractor currently, I had to break the control aspect down to what is the hot wire( red) and what is the return wire (common) to make 24 volts work though out the control of each function on a thermostat. In most cases red is hot to then have the thermostat construction and actions determine what it powers -the white ( heat) yellow (cool) green (fan) and brown or black for the reversing valve while the blue ( common ) is now required to be installed for the WiFi and Nest thermostats to work and charge internal batteries correctly. it may help others in understanding that a thermostat is a temperature based selector switch for the action one will look for in controlling the function of a heating and or cooling device as red as it’s hot leg to call on those such functions with the common returning to complete the circuitry.
Man you save me. I have a new Trane Heat pump and an old furnace from 30 years ago and it still works. I bought it because of a good deal. Installed it but the wiring was driving me crazy. Now, I know how seven wires can be hook back to the furnace and Nest Thermostat. You are a lifesaver.
Thanks for the great explanation and detail. Your attention to detail is greatly appreciated. I work as a technical engineer and again just appreciate your attention to detail. I know enough about residential HVAC to be dangerous but with your great explanations I was able to successfully update my thermostat. Thanks for everything!
There are a lot of different types of systems and therefore different wiring so once you understand that and wiring diagrams, you can know whats happening rapidly, thanks!
Thank you very much Thomas! Sorry I haven't been getting them out in the sat and sun mornings like you enjoy lately. Heads up, I hope to have the refrigerant handling book I have been working on for the past 3 years published by the end of this month!!!!
I have an old sauna. The thermostat has gone and they stopped making parts for this controller 15 years ago. If I wire W and R together can I then just turn the sauna on with my isolator switch? I don't need a timer or temp gauge for my small heating unit.
I like the extra effort you made to draw the diagrams in a manner viewers could read them on youtube. Sometimes manufacturers' drawings will use dots to indicate connections at crossing wires. I find that arrows on the lines helps people understand where the current is flowing to and from. The heat pump W circuits are interesting with two sources feeding the same ahu heat control. Two stage wiring is another challenge which is pretty common these days and dual fuel certainly adds complications.
Yes, I did a video on dual fuel wiring but I just showed a control board, dual fuel thermostat, outdoor sensor and ac contactor all next to each other when explaining. thanks for the extra tips that you would like to see in future videos, thanks!
Dear Craig, thanks for the clear explanation on the control wires. I read your text book and could not find any resources on the two state compressors, with Y1 and Y2. I understand that thermostat , in the heat mode, calls for W when there is more than 2 degree difference. What I am not clear is how the HP system decides to go into the Y2 mode. My 3 stage Honeywell thermostat has no indication for the second stage. Therefore, I do not know if the compressor is in the second stage. Is the temperature falls greater than 2 degree, the W and Y2 is energized together?
I'm late, you probably can get the exact diagram you want as a PDF from the manufacturers website or just Google blankety blank schematic diagram for your system. Unfortunately not all makes use the same terminal buss letters, and some are digital rather than analog controlled now.
Yeah ha ha, it takes some time to access my mind files and they can be dusty sometimes for sure depending on the topic! We all do what we can and try our best, thanks a lot Jesse!
The C wire is basically the AC return for continuous thermostat power right? If so that explains why smart thermostats require one. If a system does not have a C wire, but I have a 24 volts ac power adapter, would I still be able to connect a smart thermostat if I connect one output wire from the adapter to C and the other output wire to R/RC?
Hi, do you have any videos on wiring a smart thermostat to a dual transformer system: zone switching relay for heat (hot water baseboard) and separate air handler for air conditioning? Thanks!
I recently had a Tempstar FEM4X6000BL 5 ton air handler with a 20KW electric heater strip installed. I want to change my thermostat to a ecobee Smart Thermostat ENHANCED. My existing t-stat is wired with 4 wires and I think the new t-stat requires 5 wires. There is a 5th wire (blue) not used at the t-stat. I assume it is the same at the air handler. I need to kow how this configuration should be connected. This is not a heat pump. I have an outdoor condensing unit. I hope you can help.
Hi everyone , I want to control two separate systems from one thermostat ( Honeywell 9000 wi fi ) , there is 3 wires coming from air handler ( red , green, yellow ) and 2 coming from the boiler ( red , white ) . The thermostat manual said that for this thermostat the common wire must to come from ac unit . Is there a way to don't run another wire from the attic to 1st floor ? where the thermostat is located .
Hi I have a very old carrier mechanical thermostat (30 years old) , and I would like to install a Amazon intelligent thermostat. My old thermostat have the following wiring Y, G and R . When wiring de Amazon thermostat it would not turn on unless i connect G from the old carrier thermostat to C on the Amazon thermostat but when turning on only the compresor turn on and the evaporator doesn’t. Can I Brigde C and G on the Amazon thermostat so I have power and the evaporator would turn on? Or what should I do? Thank for your help
Hey! Trying to identify the "C" common wire for a new smart thermostat. I am currently using a Honeywell thermostat that only requires 3 wires (Red, Yellow & Green). The Blue and White are wrapped around the bundle since I only use this thermostat for my AC. Would the other end of the "C" wire be only my outside unit, or up in the attic where the air handler is? Or??? Would really hate to spend the $$$$ for a simple wire hook up! Thanks in advance.
I had a one system thermostat that controlled by heat and AC through a forced hot air furnace. I have since had the systems split with 2 thermostats. I would like to control them through one thermostat. The AC thermostat has 3 wires (RC/Y/G) and the furnace has R(Rc jumper), G/W/Y. Based on what I see in your videos, should I run the current AC Thermostat RC wire to the new thermostat RC connection (not jumped) and the heat R wire to the R connection on the new thermostat. And would both G wires need to share the G connection on the thermostat? Both systems are on their own power meaning 24v comes from 2 separate locations.
I have a attic air handler unit AC/heat and also have an oil boiler for baseboard heat....is it possible to wire a thermostat to run my boiler for my primary heat and air handler for my secondary / emerency heat..?? What would my wiring diagram be ??
On old manual Honeywell stat there is an X terminal that is wired into and the other end hooks into the board in an old Coleman AH14-0 air handler and this board has Thermostat connections on top then Outdoor Unit connections on bottom, all on one board. Both X connections on this board are being used. New Honeywell stat RTH6580WF needs a common. Can I just use this black wire from X on board and put it on C in new stat? New stat has no battery backup so I need a common. I am assuming both X terminals on this joint board are both common terminals but not sure.
My thermostat is a very old lennox model with 2 wire currently connected and the remaining 5 cables are not connected anywhere. how do I replace my old thermostat? all the cables are either white or red.
just my 2cents .. use a meter to check voltage between C (blue) and R to make sure you have 24volts. If you don't there may be a autotive type 3amp blade fuse on the low volt circuit board located on the heater. Also if there is no voltage, as was the case with my installation, it may be that C (blue) was never connected at either end.
love all your videos, i am interested in acquiring your book, but i have a question does your book have a section on troubleshooting ?? keep those videos coming. thanks
PBS #007, yes the book has a section on troubleshooting. This book is about working with refrigerants, getting systems ready for refrigerant, how they work, charging, troubleshooting, mismatches and airflow problems. The entire outline and several sample pages are available at www.acservicetech.com/ac-book thanks!
Great tutorial, I would like to ask the meaning of this colors on a payne electric furnaces I have a : Brown,red,white(w2),blue(w3)and grey and I trying to figure out which goes with it,I hope you can guide me, on advances thanks.
Craig, Would you do a detailed schematic for an electric heat thermostat? How does the heat keeping from being made when you have thermostat on heat and you have fan on the "on" ? I have looked on the net but I cannot find a thermostat schematic for what I want to know. Thanks for your accurate, detailed valuable videos.
Hey Aliso, do you mean electric resistance heat strips on an air handler? If so, use the Heat Pump Thermostat and use the E, G, and R, along with the optional C. Just don't do the wiring for the AC Condenser showed in the pic, thanks!
@@acservicetechchannel Craig, What I mean is a detailed schematic of the thermostat with the sub-base. I reference "Thermostat Wiring Principles" by Bob Scaringe Ph.D., P.E. where detailed schematics of the thermostats and sub-base are drawn. However, he does not provide electric heat thermostat, non-heat pump schematic. I would like to know how w is not made when you have g made for fan on but w makes and breaks when calling for heat or not calling for heat. Thanks again for sharing your valuable knowledge.
I know this is not on the topic of the video but quick question. I see on all your Superheat/Subcool videos you have a superheat charging chart based on indoor/outdoor temp. When charging a system with a TXV having to use Subcool does indoor/outdoor temps matter ? Does your target sub cool rating become lower in certain occasions ? Please explain and thank you so much for the awesome videos !
Subcooling will become higher when the outdoor DB is very high but most manufacturers give 1 to 3 target Subcooling measurements but most give 1 as an average since they are so close. It must be at least 70 DB inside and 70 DB outside before checking the charge. Did you see the video I did on charging an ac in low outdoor temps with the charging bag? thanks
Great videos Craig.. I do have a question that I cant seem to figure out why my new Goodman MVC96 furnace blower fan shuts off as soon as I switch the thermostat to cool mode but the condenser does start up fine. Because of no blower fan circulation the TXV and service port start freezing up immediately so I cant even get to setting sub cooling . I have the 2 condenser wires hooked to Y & C on the furnace control board but when set the thermostat to cool it shut off the blower fan. Blower fan also wont run in the ON or Auto position when set to cool but does work in heat and fan only mode.??? Any suggestions would be great. thanks
James, did you say that you replaced your thermostat already in a different thread? It sounds like the thermostat is just not sending the signal to indoor unit when you are turning cooling on. You could turn the power off to the furnace and then wire nut or jumper R, Y, and g at the thermostat. Then turn the power back on. If this turns cooling on and the blower runs no problem then your thermostat is to blame. The thermostat usually connects r to y and g but maybe it is only connecting r to y and your furnace board is not getting a signal to turn the fan on? Though usually even if the board gets a 24v signal to only y, it still turns the blower on because it knows cooling is calling, thanks
How can you transfer the wires from the old thermostat to the new? My old thermostat had the setup of W2 (black wire and jumper wire) E (jumper wire) Y(yellow wire) G(green wire) R(red wire) B(blue wire) X (brown or pink couldn't tell from fading) My new one has the spots if S. L/A S. O/B Y. Aux W2 Y2. E G. W C. K U. R U. Rd My unit is a heat and air together and its electric. Any help is appreciated
I cannot get 24v on red and blue what seems to be the problem, but i can get it fr red to green. Can i put a jumper from green to blue so that i can get 24v to red and blue.(common)
I have a 3yr old trane furnace in my attic, Carolina Comfort installed it, I have issues all the time with it blowing the DAT sensor and the 240 to 24v transformer. The blower inside the the furnace has a few main wires about 8GA feeding into the circuit board but I’m really surprised to see that the black and blue 8GA wares are just capped off. I’m quite certain this may be causing my issue. They charge me $700 for installing a $25 transformer about ever 6-8months it fries so bad that it literally smokes. Any thoughts?
Low voltage circuit is consuming to much voltage. I've heard of gas valves droping their ohms rating. Less resistance can cause it to draw more voltage. Good gas valve about 50 ohms believe. A low voltage power consuming device, not a switch issue.
I have a heat only thermostat which is pretty old and I want to replace it with a new one. There are only two wires so I ordered a two wire thermostat which has three terminals W, C, R. Which wires go on which terminal?
I have thermostat with Rh, Rc, G, W, Y, but, not C. There are five wires from the wall - Red, Black, Blue, White, and Grey (yellow). I used a meter to check the 24V is output between Red and Grey; also between Black and Grey. I put Red-Rh, Black-Rc, Blue-G, White-W and Grey-Y. The heading and fan are working. But, the cooling doesn't seem to work. Please advise. Thank you very much!
Can you please post something explaining what exactly the common wire does? How does it relate to the other wires or thermostat so that no batteries are needed? Thanks
The battiers are just powering the relays in the thermostat instead of getting direct power from 24v circuit. Common is just used to complete a full circuit. My instructor always taught me that voltage just wants to go to work (coil energizing) and go back home. As in back to the transformer or C for common on the board.
Mr. Craig I have a question on low voltage T.stat wire if you have heat pump only have 2 terminal it is no way to run new thermostat can you be able to make work please tell me how . Thank again
Franky Rojas If your heat pump only has two NEW low voltage terminals it would appear to be an Air Conditioner, which is cooling only. If that is two line voltage terminals call an experienced electrician. If you don’t know the difference calll an experienced tech. It makes a difference ! Don’t get hurt or blow it up, it’s cheaper to let experience pave the way.
Yeah I am not sure what you would only have two wires from. Maybe look the model number up of the heat pump or air handler you are referring to for a wiring diagram for that but 24v controls for a heat pump would typically need more than two wires, thanks Franky and Stephen!
@@bauhnguefyische667 I'm not sure what you are trying to convey here. Honeywell makes a wireless t stat and module and it works excellent when done properly, I also allows for internet connectivity. I've installed a few of these for customers who wanted remote access ( ski cabin, pump house, ski chalet, lake house ) so they could turn the system up when they were going to be there so it would be hot when they arrived.. also allows you to know if heat has gone out.. useful in 2nd homes in this area so people avoid frozen pipes.
What if you find only 3 wires hooked up on the thermostat? Red, blue and white. Only way to turn off the heater (which was on emergency) was to turn off the breaker. Now the furnace doesn't turn back on.
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UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ
Valve Core Removal Tool amzn.to/2uYr8WL
Blue Vapor Yellow Jacket Gauge- amzn.to/2Ju7pan
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UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ
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Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs
Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw
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AC Service Tech LLC sorry I can not find a proper place to send you a message or email. I’m a third year HAVC service tech in Cleveland. I have a request. Due to the fact that I can not find a good video anywhere for this. Can you please possibly make a video for steam boiler McDonnell Miller LWCO and auto feed. Diagnostics and schematic. Thank you so much. Your videos are very informative and we (younger techs ) appreciate you. Thank you.
Do you have a Heat Pump wiring diagram that shows how to add a outdoor ambient control sensor
this video just saved me a minimum of $150 to fix the wiring mistake that another company made if not the full 750 the original company quoted stating I needed a whole new board... for a wiring mistake they made... Thanks!
This video helped me tremendously in installing my new Nest learning thermostat. The wires from the thermostat I was replacing were not properly labeled and the original installation was performed without the common wire. I kept getting "No power to Y1". After following another video on TH-cam, I performed the G wire hack but then I got the "No power to Rc" message. I was about to throw in the towel and call a professional when I found this video. Through watching it, I was able to figure out that the wire with only two leads came from the outside and the other wire went to the thermostat. I learned the meaning of C wire, Y1, Y2, Rc, Rh, G and they were no longer just letters to me. I figured out which wire coming from the outside was the common wire, hooked up a common wire to go to the thermostat, fixed the mislabeled wires and the Nest was happy. Thank you so much for putting this video together!
We are in smart home services and your video is very educational, cannot thank you enough
You are by far the best HVAC teacher. I just can't thank you enough sir. God bless you❤️❤️❤️❤️
Thank you very much! May the Lord Bless You Too!
As an electrician by trade and are working with an HVAC contractor currently, I had to break the control aspect down to what is the hot wire( red) and what is the return wire (common) to make 24 volts work though out the control of each function on a thermostat. In most cases red is hot to then have the thermostat construction and actions determine what it powers -the white ( heat) yellow (cool) green (fan) and brown or black for the reversing valve while the blue ( common ) is now required to be installed for the WiFi and Nest thermostats to work and charge internal batteries correctly. it may help others in understanding that a thermostat is a temperature based selector switch for the action one will look for in controlling the function of a heating and or cooling device as red as it’s hot leg to call on those such functions with the common returning to complete the circuitry.
Absolutely! Great tips! I added the thermostat video playlist in the description section, where videos focus more on the voltage flow, thanks Todd!
Man you save me. I have a new Trane Heat pump and an old furnace from 30 years ago and it still works. I bought it because of a good deal. Installed it but the wiring was driving me crazy. Now, I know how seven wires can be hook back to the furnace and Nest Thermostat. You are a lifesaver.
Thanks for the great explanation and detail. Your attention to detail is greatly appreciated. I work as a technical engineer and again just appreciate your attention to detail. I know enough about residential HVAC to be dangerous but with your great explanations I was able to successfully update my thermostat. Thanks for everything!
Thanks Teacher from AC Service Tech LLC Good Luck 🤝👍
Thanks Durazno!
Keep 'em coming. Great teaching and illustration skills.
Thanks a lot Nota Newbie!
Boy do I have allot to learn. Thank You
I have a heat pump Natural Gas Thermostat wiring I couldnt quite follow
Thanks man. You saved me a lot of money
Thanks hddm3!
The low voltage to me can be one of the most challenging things I come across. Thank you for this help!
There are a lot of different types of systems and therefore different wiring so once you understand that and wiring diagrams, you can know whats happening rapidly, thanks!
I so look forward to watching your very helpful and educational technical videos Craig .
Thank you
Thank you very much Thomas! Sorry I haven't been getting them out in the sat and sun mornings like you enjoy lately. Heads up, I hope to have the refrigerant handling book I have been working on for the past 3 years published by the end of this month!!!!
Thank you for the knowledge
Thank for sharing all this information I am learning a lot with you
You are so welcome
Great vid. Easy to understand.
Thanks.
I have an old sauna. The thermostat has gone and they stopped making parts for this controller 15 years ago. If I wire W and R together can I then just turn the sauna on with my isolator switch? I don't need a timer or temp gauge for my small heating unit.
Awesome video and great information and love your other videos keep up the great work
Thank you for the support!
Thanks so much for the diagram! followed it as you showed for the furnace and A/C and my thermostat finally controls my A/C unit now. Thanks again
Thanks Jesse!
Thank you very much for another excellent video 🇺🇸👍
Thank you very much Gilberto!
Thank you! Very Very good before summer! )
Glad to help Tapch MC!
Thank you as always Craig! Love this trade!!!
Thanks a lot Ken!
good video helps a lot. thanks
excellent, thanks for posting!
Glad you enjoyed it!
Nicely done indeed, but left out a two wire setup(as simple as it may be). Cheers
Wow, this was great and my head hurts. Maybe one day all tstats will be wireless.
I like the extra effort you made to draw the diagrams in a manner viewers could read them on youtube. Sometimes manufacturers' drawings will use dots to indicate connections at crossing wires. I find that arrows on the lines helps people understand where the current is flowing to and from. The heat pump W circuits are interesting with two sources feeding the same ahu heat control. Two stage wiring is another challenge which is pretty common these days and dual fuel certainly adds complications.
Yes, I did a video on dual fuel wiring but I just showed a control board, dual fuel thermostat, outdoor sensor and ac contactor all next to each other when explaining. thanks for the extra tips that you would like to see in future videos, thanks!
Dear Craig, thanks for the clear explanation on the control wires. I read your text book and could not find any resources on the two state compressors, with Y1 and Y2. I understand that thermostat , in the heat mode, calls for W when there is more than 2 degree difference. What I am not clear is how the HP system decides to go into the Y2 mode. My 3 stage Honeywell thermostat has no indication for the second stage. Therefore, I do not know if the compressor is in the second stage. Is the temperature falls greater than 2 degree, the W and Y2 is energized together?
Insanely well explained..... great video!
Thanks a lot Mark!
Great video... Thank you!
Would you a happen to have a diagram for an electric variable speed air handler and 2 stage electric heat pump? Thank you!
I'm late, you probably can get the exact diagram you want as a PDF from the manufacturers website or just Google blankety blank schematic diagram for your system. Unfortunately not all makes use the same terminal buss letters, and some are digital rather than analog controlled now.
Looking to wire a heat pump ac and use the heat pump as primary and a boiler as back up. No electric heat in duct is this possible?
Craig that was a great video
Thank you for your support!
Nice description Craig. I dont care how long you have been in this business, I still get confused sometimes...lol
Yeah ha ha, it takes some time to access my mind files and they can be dusty sometimes for sure depending on the topic! We all do what we can and try our best, thanks a lot Jesse!
Good vidéo for training
Glad you enjoyed it!
Thanks! Can a bypass humidifier be wired on W and R so the filter will only rotate during call for heat?
The C wire is basically the AC return for continuous thermostat power right? If so that explains why smart thermostats require one.
If a system does not have a C wire, but I have a 24 volts ac power adapter, would I still be able to connect a smart thermostat if I connect one output wire from the adapter to C and the other output wire to R/RC?
Hi, do you have any videos on wiring a smart thermostat to a dual transformer system: zone switching relay for heat (hot water baseboard) and separate air handler for air conditioning? Thanks!
Ty great video
Thanks Jonathan!
Fixed! It was just the thermostat batteries this time.
I recently had a Tempstar FEM4X6000BL 5 ton air handler with a 20KW electric heater strip installed. I want to change my thermostat to a ecobee Smart Thermostat ENHANCED. My existing t-stat is wired with 4 wires and I think the new t-stat requires 5 wires. There is a 5th wire (blue) not used at the t-stat. I assume it is the same at the air handler. I need to kow how this configuration should be connected. This is not a heat pump. I have an outdoor condensing unit. I hope you can help.
Good clip thanks
Hi everyone , I want to control two separate systems from one thermostat ( Honeywell 9000 wi fi ) , there is 3 wires coming from air handler ( red , green, yellow ) and 2 coming from the boiler ( red , white ) . The thermostat manual said that for this thermostat the common wire must to come from ac unit . Is there a way to don't run another wire from the attic to 1st floor ? where the thermostat is located .
Great refresher sir!
Thanks Tomon8tor!
Hi I have a very old carrier mechanical thermostat (30 years old) , and I would like to install a Amazon intelligent thermostat.
My old thermostat have the following wiring Y, G and R . When wiring de Amazon thermostat it would not turn on unless i connect G from the old carrier thermostat to C on the Amazon thermostat but when turning on only the compresor turn on and the evaporator doesn’t. Can I Brigde C and G on the Amazon thermostat so I have power and the evaporator would turn on? Or what should I do? Thank for your help
Excellent
Great channel.thank again Sr
Thanks Franky!
Hey! Trying to identify the "C" common wire for a new smart thermostat. I am currently using a Honeywell thermostat that only requires 3 wires (Red, Yellow & Green). The Blue and White are wrapped around the bundle since I only use this thermostat for my AC. Would the other end of the "C" wire be only my outside unit, or up in the attic where the air handler is? Or??? Would really hate to spend the $$$$ for a simple wire hook up! Thanks in advance.
I had a one system thermostat that controlled by heat and AC through a forced hot air furnace. I have since had the systems split with 2 thermostats. I would like to control them through one thermostat. The AC thermostat has 3 wires (RC/Y/G) and the furnace has R(Rc jumper), G/W/Y. Based on what I see in your videos, should I run the current AC Thermostat RC wire to the new thermostat RC connection (not jumped) and the heat R wire to the R connection on the new thermostat. And would both G wires need to share the G connection on the thermostat? Both systems are on their own power meaning 24v comes from 2 separate locations.
I have a attic air handler unit AC/heat and also have an oil boiler for baseboard heat....is it possible to wire a thermostat to run my boiler for my primary heat and air handler for my secondary / emerency heat..?? What would my wiring diagram be ??
On old manual Honeywell stat there is an X terminal that is wired into and the other end hooks into the board in an old Coleman AH14-0 air handler and this board has Thermostat connections on top then Outdoor Unit connections on bottom, all on one board. Both X connections on this board are being used. New Honeywell stat RTH6580WF needs a common. Can I just use this black wire from X on board and put it on C in new stat? New stat has no battery backup so I need a common. I am assuming both X terminals on this joint board are both common terminals but not sure.
Thanks! 👍
My thermostat is a very old lennox model with 2 wire currently connected and the remaining 5 cables are not connected anywhere. how do I replace my old thermostat? all the cables are either white or red.
just my 2cents .. use a meter to check voltage between C (blue) and R to make sure you have 24volts. If you don't there may be a autotive type 3amp blade fuse on the low volt circuit board located on the heater. Also if there is no voltage, as was the case with my installation, it may be that C (blue) was never connected at either end.
thank you!
No worries!
R to W for heat, DOES NOT need a fan connection? The control board in the furnace does it? thank you
Correct. Fan waits until the heat exchanger warms up.
What about the Automatic Condensate Pump wiring...does it just cut the "R" wire to kill the power. Missing that wiring diagram.
love all your videos, i am interested in acquiring your book, but i have a question does your book have a section on troubleshooting ?? keep those videos coming. thanks
PBS #007, yes the book has a section on troubleshooting. This book is about working with refrigerants, getting systems ready for refrigerant, how they work, charging, troubleshooting, mismatches and airflow problems. The entire outline and several sample pages are available at www.acservicetech.com/ac-book thanks!
How about a PTAC heat pump KILMAIRE, for the life of me I can’t but find three wires! Ty
I have a Evcon thermostat how do I put on it has only 3wires for heating and ac
Awesomeness
Connect Rc to Y and G for cooling? Would that make the fan be on LOW SPEED?
high speed if y is also connected to r and g
Good video
Thanks Burrows & Co!
Great tutorial, I would like to ask the meaning of this colors on a payne electric furnaces I have a :
Brown,red,white(w2),blue(w3)and grey and I trying to figure out which goes with it,I hope you can guide me, on advances thanks.
Craig, Would you do a detailed schematic for an electric heat thermostat? How does the heat keeping from being made when you have thermostat on heat and you have fan on the "on" ? I have looked on the net but I cannot find a thermostat schematic for what I want to know. Thanks for your accurate, detailed valuable videos.
Hey Aliso, do you mean electric resistance heat strips on an air handler? If so, use the Heat Pump Thermostat and use the E, G, and R, along with the optional C. Just don't do the wiring for the AC Condenser showed in the pic, thanks!
@@acservicetechchannel Craig, What I mean is a detailed schematic of the thermostat with the sub-base. I reference "Thermostat Wiring Principles" by Bob Scaringe Ph.D., P.E. where detailed schematics of the thermostats and sub-base are drawn. However, he does not provide electric heat thermostat, non-heat pump schematic. I would like to know how w is not made when you have g made for fan on but w makes and breaks when calling for heat or not calling for heat. Thanks again for sharing your valuable knowledge.
Ok Aliso 82, thanks for letting me know!
@@acservicetechchannel what do you mean don't do the wiring showed for ac condenser????
I know this is not on the topic of the video but quick question. I see on all your Superheat/Subcool videos you have a superheat charging chart based on indoor/outdoor temp. When charging a system with a TXV having to use Subcool does indoor/outdoor temps matter ? Does your target sub cool rating become lower in certain occasions ? Please explain and thank you so much for the awesome videos !
Subcooling will become higher when the outdoor DB is very high but most manufacturers give 1 to 3 target Subcooling measurements but most give 1 as an average since they are so close. It must be at least 70 DB inside and 70 DB outside before checking the charge. Did you see the video I did on charging an ac in low outdoor temps with the charging bag? thanks
Thank you so much no I will search that . Awesome videos
Great videos Craig.. I do have a question that I cant seem to figure out why my new Goodman MVC96 furnace blower fan shuts off as soon as I switch the thermostat to cool mode but the condenser does start up fine. Because of no blower fan circulation the TXV and service port start freezing up immediately so I cant even get to setting sub cooling . I have the 2 condenser wires hooked to Y & C on the furnace control board but when set the thermostat to cool it shut off the blower fan. Blower fan also wont run in the ON or Auto position when set to cool but does work in heat and fan only mode.??? Any suggestions would be great. thanks
James, did you say that you replaced your thermostat already in a different thread? It sounds like the thermostat is just not sending the signal to indoor unit when you are turning cooling on. You could turn the power off to the furnace and then wire nut or jumper R, Y, and g at the thermostat. Then turn the power back on. If this turns cooling on and the blower runs no problem then your thermostat is to blame. The thermostat usually connects r to y and g but maybe it is only connecting r to y and your furnace board is not getting a signal to turn the fan on? Though usually even if the board gets a 24v signal to only y, it still turns the blower on because it knows cooling is calling, thanks
Do these apply to rv,s ?? Need help
How can you transfer the wires from the old thermostat to the new? My old thermostat had the setup of W2 (black wire and jumper wire)
E (jumper wire) Y(yellow wire) G(green wire) R(red wire) B(blue wire) X (brown or pink couldn't tell from fading)
My new one has the spots if
S. L/A
S. O/B
Y. Aux W2
Y2. E
G. W
C. K
U. R
U. Rd
My unit is a heat and air together and its electric. Any help is appreciated
I cannot get 24v on red and blue what seems to be the problem, but i can get it fr red to green. Can i put a jumper from green to blue so that i can get 24v to red and blue.(common)
I have a 3yr old trane furnace in my attic, Carolina Comfort installed it, I have issues all the time with it blowing the DAT sensor and the 240 to 24v transformer. The blower inside the the furnace has a few main wires about 8GA feeding into the circuit board but I’m really surprised to see that the black and blue 8GA wares are just capped off. I’m quite certain this may be causing my issue. They charge me $700 for installing a $25 transformer about ever 6-8months it fries so bad that it literally smokes. Any thoughts?
Low voltage circuit is consuming to much voltage. I've heard of gas valves droping their ohms rating. Less resistance can cause it to draw more voltage. Good gas valve about 50 ohms believe. A low voltage power consuming device, not a switch issue.
I have a heat only thermostat which is pretty old and I want to replace it with a new one. There are only two wires so I ordered a two wire thermostat which has three terminals W, C, R. Which wires go on which terminal?
Tommeah Ent
Connect the two wires to W&R on your new t-stat
I have thermostat with Rh, Rc, G, W, Y, but, not C. There are five wires from the wall - Red, Black, Blue, White, and Grey (yellow). I used a meter to check the 24V is output between Red and Grey; also between Black and Grey. I put Red-Rh, Black-Rc, Blue-G, White-W and Grey-Y. The heading and fan are working. But, the cooling doesn't seem to work. Please advise. Thank you very much!
They were all working. I took out the wires without writing them down and messed up.
Myabe I didn't wait long enough. How long does it usually take for the cooling system (compressor and fan outside) start running after I turn it on?
Sir!!!
Thank You.
Thanks!
Can you please post something explaining what exactly the common wire does? How does it relate to the other wires or thermostat so that no batteries are needed? Thanks
The battiers are just powering the relays in the thermostat instead of getting direct power from 24v circuit. Common is just used to complete a full circuit. My instructor always taught me that voltage just wants to go to work (coil energizing) and go back home. As in back to the transformer or C for common on the board.
Mr. Craig
I have a question on low voltage T.stat wire if you have heat pump only have 2 terminal it is no way to run new thermostat can you be able to make work please tell me how . Thank again
Franky Rojas
If your heat pump only has two NEW low voltage terminals it would appear to be an Air Conditioner, which is cooling only. If that is two line voltage terminals call an experienced electrician. If you don’t know the difference calll an experienced tech. It makes a difference ! Don’t get hurt or blow it up, it’s cheaper to let experience pave the way.
Yeah I am not sure what you would only have two wires from. Maybe look the model number up of the heat pump or air handler you are referring to for a wiring diagram for that but 24v controls for a heat pump would typically need more than two wires, thanks Franky and Stephen!
AC Service Tech LLC
That’s the value of professional advice....we have seen this....too many times....and it costs the money .... wanted saved.
You could get a wireless t stat and module. No need to pull wires
@@bauhnguefyische667 I'm not sure what you are trying to convey here. Honeywell makes a wireless t stat and module and it works excellent when done properly, I also allows for internet connectivity. I've installed a few of these for customers who wanted remote access ( ski cabin, pump house, ski chalet, lake house ) so they could turn the system up when they were going to be there so it would be hot when they arrived.. also allows you to know if heat has gone out.. useful in 2nd homes in this area so people avoid frozen pipes.
Can you give me a diagram for a variable speed heatpump and gas furnace with a outdoor temp sender? Thank you for any help.
How about a oil furnace with a TR and TW terminal
hello sir
i need your help for ..
thermostat delta dore 6053038 connect to saunier duval gas boiler please guide me i can ??
thanks
What if you find only 3 wires hooked up on the thermostat? Red, blue and white. Only way to turn off the heater (which was on emergency) was to turn off the breaker. Now the furnace doesn't turn back on.
Sir can you make one video Fcu alerton company tharmostart wiring
What is classified as dual fuel? What would w 1 2 and 3 be?
Have you ever seen a bypass where the tech doesn't use the y on board and everything works like normal?
What if the control board only has R,W,G How to wire it for A/C ? No Y or C its a older Goodman furnace.
Would indicate you have no AC working in connection with the heater?
Always thought the Rc was for an AUXILIARY power supple? A second transformer!
Rc is power to the thermostat and uses c as the common for powering the tstat.
Confusing