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Home » Wiring a Heat Pump Thermostat to the Air Handler and Outdoor Unit! Functions, Terminals, Colors! technology connections heat pump

Wiring a Heat Pump Thermostat to the Air Handler and Outdoor Unit! Functions, Terminals, Colors! technology connections heat pump



This HVAC Video is about how to Install the Low Voltage Wiring from your Heat Pump Thermostat to an Air Handler with Electric Resistance Heat and from there to your Outside Unit. I go over terminal letters, functions, colors, how the defrost board works along with the most efficient operation of the thermostat as well as other tips!
Tool List-
Support-

Supervision is needed by a licensed HVAC Tech before doing this as Experience and Apprenticeship garners Wisdom and Safety.

These Videos are all part of our Training Series on HVACR Service, Installation, Preventative Maintenance, General Knowledge, and Tips. Please comment and ask for videos that you would like to see in the future! We come out with new videos every few days from my job sites, service calls, and the training shop! I hope you enjoy and find them very beneficial! See you next time at ACSERVICETECH Channel!

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If you want to support the ACSERVICETECH Channel and receive more HVAC content, check out www.Patreon.com/acservicetech

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Here is the Link for the newer UEI DL479 Multimeter with temp sensor-

Here is the Link for the newer UEI DL 469 Multimeter-

Here is a link to the UEI DL389 Multimeter used in this video-

Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-

Here is a link for the Supco Magnet Jumpers

Here is a link to Refrigerant hoses with valves used in the videos

Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos

Here is a link to the Digital Refrigerant Scale used in the video

Here is a link to the Imperial 535-C Kwik Charge Vaporizer for Charging Refrigerant-

Here is a link to the JB 6 CFM Vacuum Pump

Here is a link to 1 gallon of JB Vacuum Pump Oil

Here is a link to the Supco Vacuum Micron Gauge

Here is a link to the 1/4″ by 1/4″ female coupler from Supco –

Here is the Link for the 4 Port Yellow Jacket Brute Manifold Gauges and hoses-

Here is the link to the Appion Valve Core Removal Tool-

Here is the link to the Fieldpiece ST4 Dual Temp Meter-

Here is the Link to the Fieldpiece MR45 Recovery Machine-

Here is the Link to the Appion Red 3/8″ to 1/4″ Vacuum Hose-

Here is the link to the Yellow Jacket 1/4″ by 1/4″ heavy duty hose straight-

Here is the link to the CPS Vacuum Micron Gauge-

Here is a link the Nitrogen Regulator

Here is a link to the Nitrogen Flow Meter

Here is a link to the General Tools digital Psychrometer

Here is a link to the Amprobe Digital Psychrometer

Here is a link to the Fieldpiece SDP2 Digital Psychrometer-

Here is the UEI Digital Manometer used in the videos

Here is the link for the Ratcheting Service Wrench

Here is a link to the Appion G5 Twin Recovery Pump

Here is a link for RectorSeal Bubble Gas Leak Detector

Here is a link to the air acetylene torch setup, just make sure that this will fit your tank size connection.

Here is a link to the Malco Snap Lock Punch

Here is a link to the Wiss 3 Pack Tin Snips

Here is a link to the Wiss 5 Blade Crimper

Here is a link to the Wiss Hand Seamers

Here is the link for the Hitachi Lithium Ion Drill and Flashlight kit

Here is the link for the Irwin Wire Stripper/Cutter/Crimper

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ACSERVICETECH .

Images related to the topic technology connections heat pump

Wiring a Heat Pump Thermostat to the Air Handler and Outdoor Unit! Functions, Terminals, Colors!

Wiring a Heat Pump Thermostat to the Air Handler and Outdoor Unit! Functions, Terminals, Colors!

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Wiring a Heat Pump Thermostat to the Air Handler and Outdoor Unit! Functions, Terminals, Colors!
technology connections heat pump
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45 thoughts on “Wiring a Heat Pump Thermostat to the Air Handler and Outdoor Unit! Functions, Terminals, Colors! technology connections heat pump”

  1. Tool List- https://www.amazon.com/shop/acservicetech
    Support- https://www.patreon.com/acservicetech
    For those that are looking for the tools used in the videos: (Linked Below)

    Here is the Link for the newer UEI DL479 Multimeter with temp sensor- http://amzn.to/2jtsUbJ

    Here is the Link for the newer UEI DL 469 Multimeter- http://amzn.to/2jw4ePJ

    Here is a link to the UEI DL389 Multimeter used in this video- http://amzn.to/2av8s3q

    Here is the link for the Irwin Wire Stripper/Cutter/Crimper http://amzn.to/2dGTj2V

    Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-http://amzn.to/2jyK5Ka

    Here is a link for the Supco Magnet Jumpers http://amzn.to/2gS4h6z

    Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos-
    http://amzn.to/2aenwTq

    Here is a link to Refrigerant hoses with valves used in the videos- http://amzn.to/2aBumVI

    Here is the link to the Fieldpiece ST4 Dual Temp Meter- http://amzn.to/2wc1ME3

    Here is a link to the Digital Refrigerant Scale used in the videos-
    http://amzn.to/2b9oXYl

    Here is a link to the Imperial 535-C Kwik Charge Vaporizer for Charging Refrigerant- http://amzn.to/2wFHtBW

    Here is a link for RectorSeal Bubble Gas Leak Detector http://amzn.to/2ckWACn

    Other tool links can be found in the video description section.

    ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.

    Check out other videos on the HVACR topics of interest at- https://www.youtube.com/channel/UCOZR-1IqsAer9wzlvFgb4mA/playlists?view_as=public

  2. Question, hope someone can help: so I have heatpump with a gas furnace set up. Now days it seems like electricity is more expensive than gas… in this case, would running my furnace be more efficient then running a compressor and it's components to heat the house?

  3. Thank you again for your video.

    How can I make that the emergency heat turns off automatically when the outdoor temperature rises? I am still working on a Heat pump installation for my house. Working on Manual D, but the wiring time will come soon.
    I don't want the emergency heat to turn off manually, because if nobody is in the house by the time the temperature rises, we are going to damage the heat pump.
    Do you have a video on that? Or do you have a reference video? Where can I go further on that? Does your book cover that part of the heat pump installation?

    Thank you.

  4. I can't thank you enough! I have a suspected defrost board failure after replacing a known failed thermostat- I believe lightning got both. Now I am confident I can do so. I do have ONE question, and I believe I know the answer. This Diamond Air board does NOT have a W2, but it does have a D terminal- which I wired into W2 at the air handler when I installed it 7 years ago.I had the manuals then…. so the D terminal is a defrost signal to the strip heat/ air handler?

  5. THIS IS A GREAT VIDEO IM GETTING READY TO CHANGE MY SPLIT A/C TO A HEAT PUMP AND WAS LOST ON THE WIRING THIS HELPED ME UNDERSTAND IT THANK YOU !!!!!!!

  6. What if the heat pump goes into defrost but the coil heating doesn't kick on and the blower is just blowing cold air? What do you check? I know the coils are good because the emergency heat work. They just won't come on with aux heat when the system goes into defrost. I can't figure out what to check in order to trouble shoot.

  7. My heat pump wasn't even wired up.

    After deciding to replace my old inaccurate thermostat I realized my heat pump hasn't been wired up since it was replaced with the one before, several years ago. I bought a Nest and thanks to your video, which was very well explained, it allowed me to understand enough to wire it up. Thank you!

  8. thank you!
    i have had my heat pump serviced so many times in the years and asked every single tech how the defrost works and how the wiring works and they all danced around it like politicians!
    you've saved many headaches but sharing your knowlege so thank you again!

  9. I installed my own heat pump system and was growing frustrated because my electric heat coil would come on about 1 minute after my heat pump. I was double and triple checking my low voltage wiring and refrigerant charge and everything kept checking out OK. What I didn't know, and what your video explained, is that the thermostat will automatically turn on the electric coil (i.e. "emergency heat") if there's more than 1 degree of difference between the set temperature and the temperature in the room. If the room were at 71 degrees, I'd set the thermostat to 78 degrees to ensure the heat didn't inadvertently turn off. I didn't realize the thermostat was SUPPOSED TO turn on the electric heat when there was such a large temperature difference between the room and thermostat setting. When I set the heat level so it was only 1 degree off, ta-da! It worked like I expected. THANK YOU for making this subtle, yet very important, point.

  10. Now that is a great Video!!! I was having a problem with at new heat pump reversing valve, i didn't know that Reheem is backwards. I purchased a Weatherking (made by Reheem) 2 ton heat pump and the didn't understand why the damn this was running in heat mode. "O" was connected to it (backwards) I corrected it at the thermostat. Thank You

  11. I was interested in learning how these units interacted and your video brought a clearer image! Thanks. I have a Carrier heat pump system with an Infinity thermostat and I want to upgrade to a wifi thermostat Honeywell T5 this week. Would there be anything that I would need to know? Does the Infinity thermostat have a C wire to make it the 5 wires I need for the T5?

  12. THanks for the video. One question. Is there detailed information in the tstat manual? What about the board you are showing, is there an installation manual that would detail the operation?

  13. Great video, very good explanation of how a heat pump and the thermostat function. So, I have a related question and because you sound so knowledgeable I am going to ask you my "Thinking Out of the Box" question. I live in a 3200 s/f single-story house and I have two heat pumps now that we are retired and living on SS I don't want to heat or cool the entire house al the time. I have a 3.5-ton unit for the living part of the house and a separate 2.5-ton unit on the other side of the house down a hallway for the four bedrooms. Typically we only run the 3.5-ton unit during the day and turn the other unit off, then at night, we turn off the 3.5-ton unit and only run the 2.5-ton unit at night while we are sleeping.

    Doing this saves us a lot of money because there is no need to heat the entire house at night while we are sleeping, and vice-versa. A few times during the year when we have company over we run both units at the same time for a few hours to condition the entire house.

    Ok, here comes my question, is there a device used for zoning HVAC systems that would automatically switch between the two thermostats, meaning I could set a timer of sorts to turn on the 3.5 system during the day and then off at night and then turn on the 2.5 system to run during the night? In other words some device with a timer that would control the power to the two different thermostats?

    Or maybe a dual thermostat combo system that has two thermostats that communicate with each other?

    Any thoughts or info on how to accomplish cycling the on and off between the two different thermostats automatically would really be appreciated. Thanks

  14. Why do some air handlers have these boards and some don't that I notice? I am only installing carrier and are the ones with boards 2 stage and ones without only single stage?

  15. Thank you for your video.
    I have friendly suggestion, In this video your speed of talking is perfect because you are taking your time but you go to some of your videos like you are in rush , going very fast which is discouraging because some people can't go that speed.
    Thus you judge it which one is easier or better for you.
    Thanks.

  16. I have a:
    GOODMAN ASPT33C14 air handler w/15kw strips, ECM motor and non adjustable TXV.

    GOODMAN GSZ16030 heat pump.
    (16 SEER / 2.5 TON).

    Question is why am I using the Y2 terminal on the terminal board of the air handler instead of using the Y1 terminal?

    Goodman manual specifically states to use Y2 on air handler terminal board.

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