HVAC Heat Pump Controls

[@hlub82]

Dr. Z thank you. We need more honest repairman like you around. Wished you live in my area, I hire you to fix my central air right now cuz I know you are an honest and not scammer like a lot of repairman.

[@Dragonsayian]

I respect what work you do on youtube for us apprentices to maintain some knowledge in hvac nice work dudes

[@genepryor4704]

I am a female hvac service technician in florida. i have found it hard working in a male dominate world. your videos have helped me brush up on alot that i have forgotten. Thank you.

[@Sam-dc7qp]

Thanks for the video they don't make it clear in school like you makes learning a lot easier

[@958kris]

You are the best. How effective is it to teach something by using terms and concepts that are NOT understood by the students? DrZ, you get it because you know how to teach. Thanks for all the help!

[@Bin95]

I spend a lot of time on your channel, your info is great, your videos are so freindly and interesting. One tip, if you can zoom in on a relay or something like in this video, just take a still picture up close with a digital camera, and insert it into your video.

[@lostincause3418]

I watch your videos (did a lot of watching before my first interview 3 years ago to prep for questions), mechanics in my last a/c company watch your videos, and my new hvac company i also saw mechanics also watching your videos. You are well-liked, thank you for always sharing.

[@mazzmari]

Cool video. We don't really use air source heat pumps with backup heating strips up here. I always wondered how the emergency heat worked, thanks for clearing that up! I'd love to see some commercial controls.

[@natetest2]

Yep. Just gave birth to a 6 pound food baby! I was in labor for 20 minutes. I watched the video during my 20 minutes in labor

[@USmarine1989]

I like what you did here. It's simplified.

[@eggman9713]

@Metalcastr In my experience, most typical heat pumps are pretty good down to 20 deg F, then you start having to use your auxiliary heat source more. Some of the mini-splits out there can supply pretty good heat down to 0 deg F.

[@DrZarkloff]

@thisisnotyours1 Yes, typically, the fan motor will be off during the defrost cycle. The system will defrost every 30, 60 or 90 minutes. It depends on how you set up the defrost board.

[@renecuevas4128]

Love ur pool n family time. They seem to enjoy such a beautiful pool😏

[@cskamnt00]

cool video, i remebered most of the color terms, an the componet on each line. thanks, i enjoy your videos.

[@DrZarkloff]

Congrats and thanks for watching.

[@DrZarkloff]

@kreimerair Thanks for watching my videos. I don't know anything about the HVAC schools in the LA area. You might want to call around.

[@DrZarkloff]

@Drew927 You could try replacing the contactor if you don't have a multimeter to test it first.

[@newstart49]

So that's what electricity looks like. LOL. Fun video doc.

[@DrZarkloff]

@avon504 What you have is a two stage unit. If both of the compressors are in tandem, they share the same refrigeration circuit. If they do not connect in tandem then they both have separate refrigeration circuits. It may look like you have only one evaporator and one condensor but you might have two circuits.

[@DrZarkloff]

@georgexiong1 You really need to check the secondary voltage as where the wires come out from the transformer to test it properly.

[@DrZarkloff]

It sounds like you have either a bad thermostat or a bad defrost board in the condensing unit. You might want to check to see it you're getting a control voltage at the condensing unit calling for heat.

[@DrZarkloff]

@myhero70 I haven't had an problems with ants getting into the covered contactors. Still, you'd think the little guys could wiggle their way inside somehow.

[@DrZarkloff]

@mazzmari Thanks. Commercial controls differ between each system. I could make a video on one.

[@DrZarkloff]

@AJHAY041890 Thank you very much for watching and congrats for graduating from HVAC school.

[@dalejandre1]

Thanks a lot, very easy to understand

[@DrZarkloff]

@catrachomg You really should have a tech do the job if you don't feel comfortable with it. The control transformer has two wires that are connected to the secondary side. One side feeds 24 volts to the (R) terminal on the thermostat and the other side feeds the common (C).

[@DrZarkloff]

@AJHAY041890 You'll need to release the nitrogen charge before you can safely braze.

[@acechoice45]

Great video Dr Z

[@DrZarkloff]

@restez1963 The video is called HVAC wiring diagrams 2.

[@DrZarkloff]

@hlub82 Thanks for the compliment and for watching.

[@DrZarkloff]

@huckleberryjay Thanks for watching. Coke Zero even tastes good.

[@thesmoothjazzguy2012]

DrZarkloff There was a problem I noticed with the wall mounted heat pumps on the portable buildings back when I was in elementary school. I noticed when it was below 40 degrees, there would be no ice on the coils, and the repair guy said the charge and TXV operation was fine, but the system would short cycle in and out of defrost. The reversing valve would switch, and the fan shut off, but it only lasted 2 seconds, and it did this over and over.

[@maxsoto4545]

thanks a lot for your videos i have learned a lot from them.

[@DrZarkloff]

@AJHAY041890 Fasten the TXV bulb at 4 o'clock if it's attached to a horizontal suction line. Then adjust the valve so that you're getting about 12 to 15 degrees superheat. Typically, the OEM TXV will come from the factory pre-adjusted to the correct setting unless you're using an aftermarket TXV. Then tweak in the charge by subcooling.

[@DrZarkloff]

@AJHAY041890 Nitrogen is used during brazing to prevent scaling on the inside of the tubing.

[@DrZarkloff]

@acechoice45 It all depends on what the problem is. Water problems can be a real pain.

[@DrZarkloff]

@Unclerayray217 Congrats and thanks for watching.

[@DrZarkloff]

@HarleyDoo2 You can call a Grand Aire dealer or see if you can find the wiring diagram at Grand Aire's web site or ICP's web site or Nordyne's web site.

[@DrZarkloff]

It's the Honeywell Prestige.

[@natetest2]

You know how it is! Your sitting there taking a forest dump like Forrest gummp but a forest dump like momma says life is like a box of chocolates cause you never know what your going to have. So sitting there taking the daily Forrest dump if your lucky one of your videos pop up and I'm not going anywhere so I enjoy a good video while grunting here and there. I think I'm going to invent grunt handles that attach to the sides of the toilet for those days a guy has to strain on the can

[@DrZarkloff]

@scotty2hotty851 I work for the school board and I live in the Gainesville, Florida area.

[@DrZarkloff]

@msorsini71 Thanks for being so kind.

[@EnEiKo]

The defrost control board..controls the 24volts for the contactor??? I have 24. Volts going in the board,but nothing at the contactor. Is a goodman 2.5tons heatpump.

[@DrZarkloff]

@co2x3 By the way, I do know how to work on swimming pools and water heaters.

[@kreimerair]

Hi Dr We like your videos very much, we appreciate the info, you are very good. Would you know of an HVAC Commercial estimating classes in or near Los Angeles Ca and do you have any recommendation for a good HVAC software for estimating? Thank you so much Kreimer A/C

[@walkingfreak]

What thermostat do you have?? That looks nice. And this can be a confusing video.

[@fyescas777]

The hardest thing to troubleshoot is a short in the system. So many wires that it seems hard to find where the short is. At least it is hard for me to find it. Any tips?

[@avon504]

Dr.zardkloff,can you explain to me,i have 10 tons tran a/c packing unit,and it has one condenser ,one evaporator but it has two compressor,so my question is condenser and evaporator divide in two for each compressor?or it' all together, tube run around all together as regular condenser?please help me out,thank you ,i am leaning...

[@mechanicwarrior20]

@Metalcastr typically down to 20 deg F

[@jenko701]

Dr z you have nailed it . But when do you use a w3 , is that just for emergency heat. .

[@DrZarkloff]

@MrTERRYD55 Does the new indoor coil have a TXV or is a fixed orifice? If it's a fixed orifice like a piston, you might want to insure that you have the correct size piston installed to match the condensing unit.

[@acechoice45]

@DrZarkloff Ive been in the hvac field for 2 years and i found that water cooled systems are easier to work on then air cooled what do you thank DR Z

[@Metalcastr]

What temp is a heat pump good down too, I can imagine that for subfreezing temps it wouldn't work well

[@michaelcostello6991]

Does the defrost turn on the indoor fan with the heat strips or is the fan already running as it is in heat mode for defrost to happen ?

[@drzarkloff506]

The defrost board does not control the indoor blower.

[@restez1963]

@DrZarkloff Dr Z you have a video which i cant find anymore that you show step by step with your finger and follow all the lines and how they work on a heat pump can you help me with this?

[@firemusic82]

You don't always see a common at the thermostat. Only when the thermostat actually needs 24 volts for the display. A thermostat is just a fancy switch.

[@DrZarkloff]

@958kris Thanks for understanding.

[@avelvargas5027]

Dr. Zarkloff I am trying to find out to see if you can help me. I have 10 years HVAC tech & I have a Vexar A-coil Model # 1854QA serial # M0407091193 with a TXV I need to know if I can swap it with a piston. I do have a 4 ton Nordinye condenser. If I do what size piston do i need. I believe it is 10 seer. The problem that I am having is that a-coil started to freeze up when I started to charge so i think the TXV is bad. Please advise me , thank you very much. I love your videos.

[@suckmyazzz]

thank you dr zokolov

[@DrZarkloff]

Believe it or not: some people gain from it. Everyone learns differently.

[@chezisaac8833]

A friend of mine changed his outdoor fan motor but I noticed he has a wire not connected from the control board marked DFR2. What does that wire connect to?

[@HarleyDoo2]

Could you get a 4 ton Grandaire wiring diagrham for the E heat. I am confused with it. This is a Heat Pump Pack 410a

[@DrZarkloff]

@myhero70 I was at a friends swimming pool.

[@myhero70]

Hey Doc, do you think the new type contactors, with the new front covers, will slow down arc outs due to fire ants?

[@renecuevas4128]

Nice pool

[@DrZarkloff]

@Metalcastr mechanicwarrior20 and eggman answered it pretty good.

[@DrZarkloff]

@Metalcastr mechanicwarrior20 and eggman answered it pretty good.

[@elbaron51]

hi can you do a video how to troubleshoot circuit boar im having problem with my heat.when i switch from a/c to heat the doest not do anything fan does not come on ether please let me know

[@lilpjuarez]

my condenser fan stops spinning,i replace the fan already. what else can it be?

[@MrShinyrod]

@ EnEiKo, I replaced my Goodman which replaced a Lennox with a Coleman. Nuff said...

[@DrZarkloff]

@cskamnt00 Thanks for watching.

[@Drew927]

sup z. everytime i turn my heat pump hot/cold it humms at the contactor. no fan or compressor sound. but the contactor is switching in and staying in when energized. any thoughts on this? also i noticed there is a capicitor (not swelled) and a hard start hooked up to this.

[@DrZarkloff]

@dfranklin5891 It really is a great durable flashlight.

[@charlesbachman9361]

Great information just listen !

[@Trackrat1833]

Well at first I thought the first 1 minute and 37 seconds was worthless, but after watching the whole video there is nothing there to help me!

[@DrZarkloff]

@Metalcastr mechanicwarrior20 and eggman answered it pretty good.

[@bawipengcin]

DrZarkloff , I am beginner in HVAC FIELD and still going to school for my diploma..one of my friend's Heatpump is freezing and I check pressure and I found that r 22 is low ..so charge 1 pound of refrigerant and I notice that pressures is going lower and lower..so I stop that..may I know why the pressure is getting low the more I charge refrigerant..home owner told me the AC is not cooling at cooling mode

[@DrZarkloff]

@crownvvc4 I work for the school board.

[@DrZarkloff]

@cdub61208 Thanks for watching.

[@Shakazulu0]

shouldn't you get a W1' signal during the heating mode @5:10?

[@DrZarkloff]

@char0507 Yes I have.

[@myhero70]

You know Bama rules. Is that my brother in your pool. Run him off, I had to, he was in my pool everyday, busted my intertube too. Love your videos.

[@MrTahoeman8]

Check the capacitor

[@DrZarkloff]

I've heard that before.

[@charleswolford74]

where do you live? I'm in Ohio and I see that someone unhooked the wires from the heat pump to the handler ..there is a similar wire coming out of the handler and a connection plate also..the previous owner ... we will just say it's not done correct

[@DrZarkloff]

@co2x3 Thanks,

[@DrZarkloff]

LOL. I hope that watching my video worked as an epidural.

[@DrZarkloff]

@fyescas777 You'd be surprised what kind of other requests I get. lol

[@hatemhassan7186]

good

[@murnise]

Dr. Z, whats the difference between the settings on an thermostat with fuel and electric? I get a call for green and white when the setting on the thermostat is set on electric, I switch it to fuel, I just get a call for heat. I am running electric heat, and I see the setting on electric, but it turns on the fan relay, and make the high speed come on. Just wanted to know why the setting are different. Thanks

[@StephenRardon]

Electric heat requires the fan signal because traditionally there wasn't any logic board to bring on the blower with a call for heat. Gas furnaces will control the blower from the board, or traditionally from the fan limit.

[@murnise]

Thanks, On electric heat, I have to switch the thermostat to fuel, because I don't want the fan coming on during the heating cycle , I have the sequencer control the fan, though the fan relay. I was just wondering, Thanks Steven for your help.

[@gerrymcadams7517]

nice video

[@DrZarkloff]

yes.

[@DrZarkloff]

@Darvin1964 thanks. lol

[@MrAirdoctor]

I am a 8 year tech and I don't think I would have had the patience to try to explain that to anyone

[@dfranklin5891]

i got the same flashlight

[@jenko701]

You forgot to say roll um.

[@soilmanted]

If you have a background in high school physics, or equivalent, where one learns about voltage, resistance, amperage, alternating current and direct current, inductance and capacitance, and how transformers and relays work, and you know how to keep 240 volts ac, 120 volts ac, and the output of large capacitors, from passing through your body, you can learn how your heat pump and air condidioner works, well enough to troubleshoot any problem it might have, in a matter of days. Yes, before the internet, I had to go to the library and have them get books for me on inter-library loan. If I liked the book, I bought my own copy. Today that is largely unnecessary. You can get the info on the internet, for free. It just takes a little googling, and some common sense in regard to weeding out the sources that are accurate and articulate, from those that are inaccurate, and written by the marginally literate - the trades are often a refuge for the partially literate, but some people in the trades are good writers, and speakers.

[@brunildat6694]

i am a female and all of a sudden my heating stopped,when i looked at the control on the wall it gave a signal hp, i touched heat and about 4 hours later i got a signal E and went off. In need of help! should i call a technician

[@liberaltearsaredrowningme7049]

Brunilda T I am a male, yes call a technician

[@soilmanted]

Yes, I think you should call a technician, but she doesn't need to know what sex you are.

[@DrZarkloff]

@buckhvac100 Maybe if Zebra want to send me one.

[@renj6531]

oh how ironic R.c. just Aldo happens to be a soda

[@fyescas777]

Soft drinks?? That's creepy.