HVAC beginner: Wiring a basic heat pump system
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- เผยแพร่เมื่อ 7 ต.ค. 2024
- This is a brief overview of heat pump thermostat wiring. Always refer to your instructions when wiring up a system to ensure you are wiring to the manufactures requirements. This video is intended to help you understand how basic heat pump systems are wired.
***YOU MAY SPLIT UP THE W1-W2-AND W3 TO STAGE ON THE BACKUP STRIP HEAT. AS LONG AS YOU HAVE A 3-4 STAGE THERMOSTAT.
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HVACmillionaire I finished training December of 2016. I went to school in west Virginia Valley College. I am enjoying every bit of this gold mine trade. we are scientist.
Thanks for your notes on the wiring of the heat pumps especially as it relates to train. discovered that the reason my heat pump(Trane) hasn't been switching properly is because the installer wired it wrong years ago! rewired it by your instructions and now everything works better than ever!
Good deal!!
Good instructions I been out of HVAC for about twenty years retired this gets my mind to working again my time contractors and relays and timer’s now a board
yep me too! cheers
Just a note for others watching this video. Bosch heat pumps use 'B' and not 'O'. In other words, you energize the Reversing valve for HEAT and not COOL. Also I think the Bosch heat pumps use 'W' for an Aux heat call back to the air handler. Thanks for the video.
Thank you for the knowledge, success for "HVAC ..." ... Pekalongan, Central Java, Indonesia attended
Appreciate the wisdom, and thanks for all you do. God Bless you for sharpening my skills on heat pumps. Haven’t come across one yet although I’ll be more confident and less intimidated when I do.
No problem. More to come. Thank you so much!
Thank you for a clear instruction on which is a function on each terminal
Glad it was helpful!
Thank you. I wish you all positive energy and success in everything you do and your words speak power in your life aswell as others. Thank you once again 😇
Thank you so much!!
your welcome!
Your video really helped me after a tech wired up my thermostats wrong... thank you!!
Glad it helped
what did the tech do
Straight to the point.Thank you
Excellent explanation, thank you very much!
Thank you for sharing this knowledge. Very helpful!
Great video. Easy and simple explained. Thank you
Thank you! hope it helped
Thanks, you explained that very well.
Excellent video, thanks!
Thank you so much Sir, Great Video. 👍
Thank you Danh!
Very nice specifications. Thanks
That helps a lot thank you
Awesome!! Want to learn more? Check out www.hvacserviceready.com
thx for the explanations well done
If you want to learn more check out www.hvacserviceready.com.
Welcom ed all
Great video!
thank you well explained
Thank you!!
Awesome explanation !
Great explanation.... thank you🙏🏽👊🏿
thank you, sir, for sharing!!!!!!
Thank you so much for a well explanation. I don't understand some systems Y from thermostat only connected to condenser Y outside but it's not connected to the air handler. But most heat pump systems thermostat Y connected to air handler and to the condenser. Why is that not connected the same?
Y is a call for compressor. In a heat pump Y is energized with a call for heat AND with a call for cool. With a totally electric system the thermostat brings the air handler fan on for heat and cool. With a gas furnace, the board brings the fan on for heat and the thermostat still brings the fan on for cool. Y basically goes from the stat straight to the outdoor unit on both systems even if it uses a board (Y) to tie the stat wire to the outdoor control wire. So Y is the same in both systems. Sometimes there’s no terminal at the indoor unit for Y because there really doesn’t need to be one. Hope that makes sense. Just think of it like this, Y has one job which is to signal the outdoor unit to comes on. G and Y are basically the same terminal at the stat on a heat pump. Whenever there’s a call for heat or cool the indoor fan is energized at the same time.
Thanks…..👍
Good job.
On old Honeywell Tstats X is common.
Just wondering how much do HVAC workers make annually? I'm thinking of maybe taking some classes for this field in the Los Angeles area
Thank god you have L terminal
I have a 4 bulb mercury bulb thermostat.
I put on a pro 4 and heat didn’t work
3 wire
Blue -- white --Red
C=com/. E= emg heat to melt ice on compressor --o= reversing valve.
5 wire ///white heat= w1 /// green=G fan yellow = y AC ///red= R 24 v ///Blue=L
I hade to put back on the mercury 4 bulb thermostat and all functions work fine. Didn’t work with pro 4 thermostat.
Is there another TState you recommend
The mercury Thermostat was a heat pump system control Carrier since you said fault there is a Red LED bulb on that mercury thermostat.
You could never be accused of being a teacher.
For beginners you should add the common wire. I train a lot of helpers and it seems they dont understand concenpts unless spoon fed
Thx Ben!
Keep in mind that just because they need to be "spoon fed" doesn't mean they aren't interested, or can't understand. (Though, to be fair, some aren't, and can't.) People learn differently, and different things are easier for different folks. For example, electricity has never been intuitive to me, but I can understand anatomy and physiology quite well. I'm sure you have time constraints at work. But as a trainer, you have a great opportunity to get creative. Try explaining it differently, or find other resources to help you make it clear. Sometimes, it just takes some different perspective. I guarantee that if your trainees are the kind of people who are putting forth an effort to learn, they'll appreciate your efforts. Peace!
Thanks bro
Found an old thermostat SN12i with L terminal, fault, with white wire on it and white from thermostat to ahu and condenser. How is that possible?
thank you. i was wondering what to do with my O wire coming from heat pump and t-stat since my air handler does not have a connection for it.
johnny dngrs you just tie them together. 👍
johnny dngrs just tie them together at the air handler. All “O” needs to do is go from the stat to the outdoor HP.
@@hvacmillionaire did that as soon as i finished watching your video. thanks
If the compressor defrost signal is connected to both the thermostat and the air-handler W terminal(s), wouldn't there be an electrical conflict on that connection, since both the defrost signal and the thermostat signal are outputs, and could disagree ?
How connect a condenser heat pump with 3 wire? Can you please help me
only have 4 wires from air handler to out side unit but out side unit has y c w r o i seen that old unit had 2 wires tied together but not sure which 2 were any suggestions
Not sure about the wires tied together. You should need all those wires at the heat pump. Maybe they were energizing the reversing valve constantly with “R” and. “O” tied together?
@@hvacmillionaire thanks
I have a Two stage furnace and heat pump I want to get wired up. I have two thermostats going to a zone board, two zone dampers, heat pump with 4 wires (Blu, Yel, Wht, Brn) and a furnace (air handler) with terminals 6 or 8 terminals. its a bosch heat pump and and American Standard furnace with honeywell thermostats and zone board. The American Standard manual shows the terminals but does not say what they do, getting hung up on this. Would you be willing to write a line diagram for this? huge help.
My Trane 624 thermostat stopped working and is no longer available. I bought a Honeywell stat and I’m trying to get information on what to do with the black wire. There is no terminal labeled Black (BK). 6 terminals, but I have 7 wires. Any advice is appreciated. Thank you.
I'm having a problem hooking up this wyze thermostat to my heat pump furnace. I have 2 S1 wire one is blue and one is light Brown I know one is for the outside temp and the other is for the heat pump but no matter how I hook it up W1 wont blow heat and the W2 will throw out heat.
I have American Standard thermostat, it has Blue color wired to its B terminal, when I checked at the furnace in the attic, that same Blue wire is wired to C terminal at the furnace. When I upgraded my thermostat to the Honeywell T5 wi-fi thermostat, I have switched the Blue wire from B (American Standard) to the C terminal of Honeywell T5, the unit did come on but the heat instantly blowing even I turned the Cool mode on. How do I fix this problem? Did I do anything wrong?
Thank you in advance
I have a question, I have a non fused disconnect, but my ac went out so i am doing away with it and instaling a window ac/heat, it runs off 220 just like my ac does, so can i swap out the non fused cut off box for a 125 amp sub panel with a 220 breaker for my new ac window unit?
Hello my nest has RH and RC for red which one should be on? Also my aux heat not turning on with nest
What is a x1 ( has hooked blue wire to it ) on a old white rogers. Thermostat
So my black goes to the Transformer.
I got a Honeywell thermostat should it go to y2 to L.
Our fan never stops running. Green is attached to G, but orange is attached to white. Is that wrong?
B is never common
C is always common
B is when your equipment uses the reversing valve for heat and o is when your equipment uses Reversing valve for ac.
Some manufacturers use reversing valve for heat.Some use it for a c.
Most of them use 0= the reversing valve for a c.
On your outdoor heat pump you will have a w1 That will send power back to your heat on when it is defrosting.
Is there a way to determine if system is o/b if theres not manual? Way to test?
Thanks I
Do all heat pumps have aux heat?
Most do. With a heat pump once the outdoor air gets below 25-30 degrees there's not much heat left in the air for the refrigerant to absorb. Once that happens the house temp. will begin to drop. The thermostat recognizes that and a second stage gets energized which is the signal to energize the back up heat (typically strip heat- heating elements)
Y is the contactor is what I was always taught
I never saw a X terminals unless it's a freezer which is used to terminate defrost
TRANE uses X to energize the strip heat in defrost.
PLEASE HELP!!!
question; i had a new hvac heat pump installed may 2017. the ac works great as it it designed.
but when heating the A-coil is freezing up and the line set too, only half way toward the compressor. it is a Ameristar model M4AH4025A1000AA, volts 208/230, motor HP 1/5, motor FLA 1.0. the thermostat is Proselect, connection are... R (connected red wire), O (orange wire),
B (empty), C (BRN wire), Y1(yellow wire), E/W1(Blue wire), G (GRN wire), W2(WHT wire)
you should call the installer as it should still be under warranty. Tell all of us who installed it so we don't hire that person.
I have white wire on w1 and black on W2 is that correct
i noticed white wire W2 and black wire W/E and there's no heat during defrost mode
What is S on a thermostat
Some stats have an s1 and s2 which is for an outdoor sensor. If that’s not what it is then see what color the wire is and then find that same wire at the air handler or heat pump abs see what terminal it’s going to.
Good morning. Need help. I have a ‘L’ wire but on the new thermostat I have not spot for that wire. The wiring is an eight wire. The new thermostat has only 7 slots. I know you said the L wire was the fault. Which terminal should I tie it too? Thanks.
Obediah Anderson don’t tie it to anything. Just make sure it’s not touching any of the other wires.
HVACmillionaire So I don’t need the L wire? I also have an E terminal and it is black. The L wire is brown.
Obediah Anderson “E” is typically jumpered to w2 or W. The “L” wire you should not need.
HVACmillionaire thank you so much.
Or just read the instructions
With a hustler mag toghether
"Rc" + "C"- 24V DC ?
"Rc" "C" 24V AC?
How right?
If there's an RC and RH terminal in the stat they probably have a jumper wire between them. If not install a jumper wire. Very old systems used 2 transformers. One in the outdoor unit and one at the indoor unit. I haven't seen one of those in many years. Most have been replaced at this point. You would only use Rc by itself if you were working on a 2 transformer system. I have no idea what you're talking about on the 24 V DC. ??
the thermostat on the contacts (Rc, C) must be supplied with a constant voltage or alternating voltage.
drive.google.com/file/d/1vW46J6PR9t_numJPXfwSQCXHl9K7wZ4x/view?usp=sharing
It's AC volts for residential heating and cooling thermostats.
If you have a millivolt gas valve with a pilot generator then its DC volts.
I tied green and red nothing happened
R is your power. G is a call for the indoor fan operation. If you have no operation you probably do not have power.
@@hvacmillionaire I have 24 volts at the red wire
@@JoseVargas-bz3zd One year later. What did you find to be the trouble!
I have a Trane unit with heatpump, my problem is the aux heat strip, it's a 10k but when in heat mode it's only heating half of the elements, I put in a new heat strip and it didn't change. Any suggestions?
Rnull 22 it could be that it’s not wired in at the air handler (control wiring) or that the switch isn’t working (sequencer or contactor) this is where I would start. Very difficult to help with this problem without pics, a volt meter and a schematic.
@@hvacmillionaire it happened last January called service tech they came out and checked it out told me its the heat strip so I got one same part number bayhtr141000 heat strip I installed it this morning, turned it on and has same problem when in emergency heat mode, it used to blow heat temp at vent of 140° now blows 90° coming out of vent.
Y is contactor. Not compressor
Semantics 🤷♂️
@@hvacmillionaire it's still wrong
Could someone please explain to me why Y is compressor on straight cool but Y is cooling on heart pumps?
What's the difference? Doesn't Y go to the compressor contractor either way? What difference does it make if you call it compressor or cooling????
Nothing. It's 24v going to Condenser, outside unit, where the compressor is located.
Ji
Hello how can you bypass the heat pump on a Goodman 2.5 ton
I need help. I have a Sensi ST55 thermostat, I’m connecting it to a Trane Heat Pump system. How do I properly wire it?
Did you find out? After watching this video I felt like I understood where the black should go. Its currently in the X2 spot which does not exist on the Sensi ST55. Now I'm not so confident. Our friend's video and diagram says the X, and D sends power to the back up heat while in defrost. He ties it to the W2. The ST55 does have a W2 available. Its been a while since you posted. I hope you were able to install it.
Quick question. I am installing a Rheem heat pump unit. I Have "brown" for common. So what is the purpose of the "Blue" wire. For I do not have a blue on Air handler nor on the nest thermostat.
The blue wire is "B" which is the reversing valve. On Rheem it is energized in heat mode. The thermostat has to be heat pump capable and there should be a setting in the installer configuration to change the reversing valve from "O" to "B".
At the air handler the "b" from the stat will just tie to "B" going to the heat pump. No need for a terminal. the stat will energize the reversing valve when needed (when stat is in heat mode)