HVAC Heat Pumps 1

[morganhill69]

Thanks for posting. This was very helpful.

[150MilesPerGallon]

Great video, Thank you for explaining these systems in great detail :-)

[DrZarkloff]

@150MilesPerGallon Thanks for watching.

[symsterjrs]

excellent 

[DrZarkloff]

@symsterjrs Thanks

[TheSam201077]

HI DR Z ! RE: INSTALL SENSING BULD . THANKS FOR YOUR RESPONDED DR Z, IT MEAN A LOT TO ME.

[TheSam201077]

Hi DR Z ! can I replace a fixed orifice to a txv valve on the fan coil ., also how do you install the remote sensing bold on the suction line . THANK YOU SO MUCH DR. I am a residential installer , just want to learn more .

[DrZarkloff]

@TheSam201077 You can replace the fixed orifice with a TXV. The sensing bulb needs to be fastened to the suction line. If the suction line if run horizontal then you need to install it at 4 o'clock on the tubing.

[SonofSam357]

@TheSam201077 he doesnt respond to any messages give up .lol its true ive asked several questions never got an response check with other ppl on youtube .i found some other helpful ppl...

[reymack1]

condensing unit?...maybe you mean the outdoor coil.

[alexpower06]

THANKS DR. I LOVE YOUR VIDEOS AND THE INTELLIGENCE YOU GIVE US ALL TECHS. WITH ALL THE RESPECT YOU MAKE MY DICK GET HARD. I KNOW I'M BEING SORCASTIC UPSS. SORRY BUT I REALLY DO ADMIRE YOU.

[MrTERRYD55]

Dr.Z how would you determine if a a

ccumulator is bad in a heat pump condenser.

[DrZarkloff]

@MrTERRYD55 I'd look for heavy rust. If you find any then you might want to check it for leaks. Also, I always replace the accumulator when I replace the compressor.

[TheChaseair]

@DrZarkloff Why do you always replace the accumulator?

[DrZarkloff]

@MrTERRYD55 The accumulator could have accumulated non-condensables throughout the years.

[MrTERRYD55]

Dr.Z how would you determine if a accumulator  is bad in a heat pump condenser.

[quickservicehvac]

great video from Mr.Quick of Quickservice

[DrZarkloff]

@quickservicehvac Thanks

[THEHVACTECH101]

What is the correct way to troubleshoot a reversing valve and what is the sequence of operation for two stage a/cs?????

[Mooseguy15]

Is a heat pump a compressor?

[DrZarkloff]

@Mooseguy15 A heat pump is an air conditioning system that can cool and heat by use of the compressor.

[thereceman]

does the defrost thermostat denergize the compressor when it senses high head pressure?

[DrZarkloff]

@thereceman The defrost thermostat stops the defrost cycle when the sensor notices that the condensing coil has a raised temperature.

[r247yan]

can you make a video on how to charge a heat pump in cold weather.. I hear you have to switch hoses etc and put one on true suction line etc.. With 410a

[DrZarkloff]

Many new R-410a systems come with a separate service port on the suction side for this reason.

[picbuck]

Thanks for another informative vid, Doc Z.

Anybody want to comment on a Carrier hotel heat pump package that freezes from the bottom of the accumulator to the compressor?

It's all 1/2" tubing to the compressor, nothing else.

After much wondering I put an access valve on each side of the accumulator. Sure enough, over 100# drop, the accumulator is blocked.

Only one problem. How can the accumulator be blocked? There's nothing in there to clog up. I must be missing something, but what?

[picbuck]

Answering my own question about blocked accumulators, much googling finds that yes, other people have had such a prob.

Since the accumulator is essentially just open (supposedly) tubing, the culprit is likely to be debris from another source lodged in the tubing.

That much debris suggests catastrophic failure in the near future, so it's a case of repair costing more than replacement.

Just FYI.

[rolando7120]

Hey Dr Z, do you have an ice maker video yet?

[DrZarkloff]

Not yet. I'll probably make an ice maker video one of these days. Thanks.

[edgardpb1]

can i put a txv in a heat pump?

[DrZarkloff]

Yes.

[richiemabie]

Stupid question, wouldn't you need a txv in a heat pump!

[DrZarkloff]

You need a restrictor at the indoor coil and one at the outdoor coil. The restrictor can be a TXV, AXV, or any fixed restrictor like a piston or capillary tubes.

[jhema45]

DrZ can we use some alternate solution instead of using reversing can we use also a solenoid valve??

[DrZarkloff]

Yes. Some commercial heat pumps use solenoid valves instead of a reversing valve.

[fedders4]

can i convert my window a/c to Heat/Cool by adding a reversing valve and new thermostat?

[DrZarkloff]

It would really be more trouble than it's worth. You'd have to add a reversing valve and another TXV and check valves. It really doesn't make sense to do it unless you're a student of the trade an are wanting to experiment.

[nucleolo]

Interesting, as usual!

[xctome]

dose Addison still make HVAC equptment?if so do you know there website?

[TheArtieCOOL]

dr z can you show a video on how to change a reversing valve

[DrZarkloff]

I'll get to it as soon as I can. Thanks.

[DrZarkloff]

You're the second person today asking me to make a video about reversing valves. I guess that I'll have to move this one up on my list of to-do videos.

[eam33380]

Thanks for the video! What is the purpose of the bulb/sausage shaped section in the pressure line leading into the reversing valve? I notice it's not present on straight AC systems.

[DrZarkloff]

Are you referring to the power head bulb?

[eam33380]

Sorry, I have no idea. The line runs out of the compressor and through that thicker section of pipe before going into the reversing valve. I'm just wondering if that thicker section is a filter or expansion chamber of some sort.

I appreciate you taking the time to make these videos and answer questions. I've done some photo documentary of automotive repairs and it's a pain in the butt to try to work and shoot at the same time... :)

[DrZarkloff]

I think that you're referring to the accumulator.

[Suiscycho]

I am confused. I've seen many straight air sytems with a fixed orifice metering device at the evap coil, but here you say that only a heat pump has them. Can you explain? Also, when replacing an outside unit and blowing the lineset, I have been in the practice of opening the line at the indoor evap coil ( where the 'restrictor', 'metering device' is and blowing with nitrogen from there. I'm afraid of blowing any particles into the orifice if I were to do otherwise. Is this good practice?

[DrZarkloff]

Not only do some straight cool systems have fixed metering devices, some heat pumps and refrigeration systems do, too. It won't be long when a fixed metering device will be a thing of the past.

[Suiscycho]

Can you please elaborate on the defrost thermostat? Head pressure? Even the defrost cycle?

[Suiscycho]

What is the purpose of an accumulator?

[DrZarkloff]

The accumulator is a container for any liquid refrigerant to evaporate before it goes back to the compressor.

[Suiscycho]

Now I understand, thanks. The liquid refrigerant will cause damage to the vapor pump inside the compressor. Why isn't there a suction line accumulator on straight cool systems I wonder?

[DrZarkloff]

A heat pump has a greater chance of liquid getting back to the compressor because the refrigerant charge has to be setup different between the heat and cool cycles. The refrigerant charge had to be changed every season before suction line accumulators were common in heat pumps.

[srtwq09]

thanx for the vid on these i ran into a commerial heat pump unit and was like WTF i got confused luckly my co worker was there lol.

[DrZarkloff]

Thanks for watching.

[jenko701]

why two compressers on the large units.

[DrZarkloff]

There are two stages of cool and heat.

[local614bro]

u can also have a tandom

[V8Jagnut]

cool vid.you need to clean your unit.lol. i did a vid of a 30 or 40 year old heat pump. i have i will post it for you.

[DrZarkloff]

Cool. I'll be looking for it.

[itscool1968]

good job jim but somone needs to get that junk out of his condencer unit:)

[DrZarkloff]

Yeah, I know. I made this video just before doing a PM on my a/c.

[mechanicwarrior20]

good Job Jim, yeah in regards to those old dinosaurs to figure out how they work it seems that you need to spend some quality time with those old systems to figure out how they work and then how to fix them?

Just like at the college I have an old Lennox climate master multizone, finding parts for those old dinosaur are getting more and more complicated as time progresses.

It even tests my patience a lot too.

It's all about relationships lol

[DrZarkloff]

I don't even bother to look for OEM parts for all the old dinos. I just get whatever will work. I like to work on the old stuff; you can get away with so much more.

[jimmymoss7644]

good video sir

[DrZarkloff]

Thanks

[mikie2501]

ty again, nice video :)

 Michael

[DrZarkloff]

Thanks.

[killtheglory]

nice video... i still think you need to get them to buy some new equipment. the good ol too many things wrong to fix just replace the thing. just kidding. but i do hate heat pumps. when i was in houston it was all gas systems. now in san antonio too many heat pumps. argghhh

[DrZarkloff]

The only part of heat pumps that I don't like to replace is the ever dreaded reversing valve, especially on the big systems. Sometimes, I just remove the reversing valve and pipe it in to be a straight cool system if it's an old piece of junk. The heat strips will usually get them by. I can do this because the school board is no fan of throwing good money after bad.

[heavyhvac]

good one drz is it very tricky brazing the reverser valve in  there i replay all of your video the night before my test and i get As thanx dr keep up the great work i have my cfc certification exam this week got any tips IM going for UNIVERSAL

[DrZarkloff]

I'm glad that my videos have been helping you. The trick is to make sure that you know all of the important dates. Remembering everything on the study guide is your best bet.

[bexshrek]

Great video once again Dr Z. Please can you tell us how that we can repay you for all your hard work and effort that you put into your videos?

[DrZarkloff]

Thanks. If all of my viewers were to buy at least one of my books from me, I'd be able to sell out of them within a week or so. Just message me or email me letting me know which of my books you'd like to buy and let me know how you'd like to pay for it. Paypal works the best for me. And, yes, you can buy more than one book.

[DrZarkloff]

The heat pump is most efficient in mild climates where the winter temperatures never drop below freezing. However, if you live in climates such as South Florida then you're better off with a straight cool system with heat strips.

[CivSiNJ]

is the heat pump system more efficient ?