@ DrZarkloff-Thanks for the feedback. Actually, turns out that I had a bunch of problems that all happened at the same time. The condensate line was backedup. The air filters were dirty. When I ran the ac unit after defrosting the ice, I burned out the motor and the capacitor. To top it all off, I was actually low on freon. The ac guy thinks that I may have a freon leak. For now, we are just going to run it and see if the freon drains out in the next couple of days. Thanx again for the response.
@DrZarkloff ...typically dosent a frozen suction line occur when the system is low on freon ?..also why are they phasing out r-22 ..is everything going to be high pressure 410a now?... and also if 410a is suppose to be ozone friendly why do u still need to recover it rather then just discharge it...thanks dr
My coils are iced up. All 3 filters were dirty. Replaced all 3 filters. I am not sure if I defrosted the ice before turning on the machine with the new filters so it iced up again. It's a reasonably new house; so I think that I am not likely low on freon. How long should I wait before I can turn on the ac unit after defrosting the ice? (By the way.... Great videos and thanks for sharing with everyone.)
Thanks !!! I noticed the ice near the suction hose and lack of air flow through the house and suspected a iced over evaporator coli.. I checked the filters and the screen in front of it was so clogged I could not see through it !!!!
I see the UV system label.... wonder if all the bacteria growth happened before or after the UV system was installed....? Probably shoulda cleaned it first....
I see the UV system label.... wonder if all the bacteria growth happened before or after the UV system was installed....? Probably shoulda cleaned it first....
@DrZarkloff I mean a passive recovery system dependent. when you close off both sides slow crack high side or low side I forgot and pack everything into the compressor til both gauges read zero.that way it gives you the ability to move the unit with out recovering the refrigerant.thus being able to replace filter drier without having to take out refrigerant.
Great videos...question, how long should a compressor run after the inside unit shuts off? I can't remember mine running as long as it has recently. I turn off the compressor circuit breaker so it won't burn up till I can get tech out here.
Dr Z, I really like your short videos. My question to you is this: I am thinking about doing an HVAC program down here in Florida, is it something hard to learn? I know a little about the field and some basic parts, but not a solid knowing. I have very little technical training, and no electrical training. I have a high school diploma. Thank you.
what the good doctor is saying is that this particular system could either have iced/frosted up due to mechanical (leak search needs to be performed) or electrical failure (capacitor on indoor fan motor possibly). that's why it's money well spent if you have a maintenance agreement with a well respected local HVAC company where they come to your house twice a year to perform a heat or cool tune up.
Dr. Z, I was checking out a 3 phase carrier commercial package unit air conditioner straight cool. It has two compressors, and one of the compressors is iced up and the other compressor runs warm. How does these compressor work.
Sir, I have got to ask you that I have installed Mitsubishi 8TR unit, In this out door unit's Suction Accumulator is getting ice up will you please tell me what cause could it have?
I had situations where a branch damper was closed mysteriously,or maybe a plastic bag laying up against the only return in the home,or the homeowners closed all the registers downstairs to get more airflow upstairs.Just to point a few more scenario's that could happen but not likely!
Hey Doc whats the replacement gas for R22 for an 100kg charge system would you recomend at this point in time taking into account performance[drop in]
@twinspur There are a few different drop ins. You could use NU22 on residential comfort cooling systems. You might want to try R 422a on medium and low temperature apps.
if i found slight electrical ground in a hermetic motor thah is operating ok do i have to replace it or do naothing, sorry this is a test question but i have no idea common sense tell me change leave it like this but im not sure if this is the right thing to thank you
@alfebre1 It's really a good idea to replace the motor because a motor that is reading ohms to ground will over amp and could put stress on relays and relays that are integrated on expensive control boards. Hermetic compressors with ohms to ground will build up acids that will eat away the winding insulation. The compressor will be an acid burn out and the entire system will have to be flushed. The repair will be very costly.
HI DR. Z thank you so much for all your videos... i will love to see videos of the new sistem R410A and how it works if thats not a problem for you. thanks
hello i bin havin problems with my AC well it runs but no cool air comes out only normal air and it has bin like 110 hot outside and my aparment is very humid and real hot we sweat a lot its real bad i go to sleep sweating and wake up sweating i live in this aparment and i have call for help and theres this dude who comes and just gos in my aparment and in 3 min the cold air is running and then
DrZ I have to say you do a great job covering all the basics of HVAC troubleshooting. I would like to add one thing to this video however. If you find a filter that is dirty enough to cause enough of an air flow problem that your coil freezes up, it may not be a bad idea to check the evaporator to see if it is stopped up as well. simply putting a new filter on it may not be a 100% fix for the problem. -Hope to see more new videos!
Good Evening DrZarkloff. I am having ice at the air handler and the coils. I have changed my filters in the past on a monthly basis. I had a newbie tech come look at the system and they said that they believed it was the TXV valve...is this something that is normal or not. I do not want to buy a part that is not needed. They said they believed it was this because the pressure had gone down while he was here. Need help before i buy a part.
@figgy1872 yeah I agree with DrZ. it doesn't sound like a TXV problem to me either. one thing to take in consideration before just pumping some gas back into the system, is it had to go somewhere. it needs to be leak checked.
thanks for these great videos DrZarkloff ... if you dont mind I have a quick question. My AC motor runs and I feel a faint breeze coming from the ducts, but nothing more ... the breeze feels cool, but the AC runs for far too long. From this can you tell if it's a problem I can fix myself or will I need to call a tech out?
@Anamacha It's always a good idea to have a tech look at your system at least once per year. Typically, you should only feel a faint breeze coming from the grill.
Thank you for posting this video Dr. Z! Helps me understand more how my HVAC systems works. I have one question thought. My Evap Coiler sits on a plastic drip pan. It seems to not be draining properly causing the drip pan to overflow with water. What can I use to clean out the clogged "draining pipe"? Any feedback would be greatly appreciated.
Dr. Z, I like all the video's you've made about HVAC...... I got a question for you or anybody that knows something about a Compressor Air Dryer that has a R407C 9.6lbs of freon.... I'm getting a high pressure alarm on the unit and also a Pressure Integral alarm( An auto off switch for the compressor so that it would not burnt up the compressor)..... Could you tell me what are the possibilities that could cause this problem????
@gixer2000 hey thanks for the help there.... I've fixed the problem by the way.... It had an open high pressure switch and when I've replaced it, the Domnick Hunters Air dryer had been working properly since then.....
Thanks so much for your series, it really helps us learn how to maintain our homes. I just spent most of the day fixing our frozen coils (caused by a reason not mentioned in your clip). So much hair and lint had worked its way past the filter and onto the fins that no air was getting through whatsoever. Not wanting to use a hose in my cupboard, I removed it all by hand :(. I believe my mistake was years of changing the filter without turning off the HVAC in a home full of molting dogs and cats!
@DrZarkloff I had the same problem with hair. I found out the previous owners had refinished the basement and they added the return by tapping into the back of the motor trunk bypassing the filter 90* on the side of the trunk. The cat hairs fed directly into th fan [and the house]. No wonder the cat loved to rub on the return vent! I solved it by a making a custom fit filter but now I have to make one every month! lol
Semi-shortcut i like to take when defrosting a residential split system is to let the IDBM run, that way you dont wait an hour to defrost. While you wait on the evaporator coil to defrost, spray the condenser coil with a water hose. Since your servicing unit add a new filter just incase
**I know this may be common knowledge to techs BUT im assume alot of ppl look on youtube for do it yourself instructions
GREAT videos, more chiller system videos w/ cooling tower plz
I like your videos I have tought of doing some my self I always say there are 2 reasons for icing 1 poor airflow IE duct work, dirty coil, blower problems and so on 2 poor refrigerant feeding the coil IE low charge, bad TXV ,outdoor temp too cold
Dr.Z thanks for all your great videos.I am an HVAC/R student at a local trade tech college and i have learned alot from your videos too.Is it possible that the reason you have a frozen evap. coil is because your metering device is defective?
dr z thank you so much for all your videos. this is my problem i replace my 5 ton. unit outdoors and its been frozen its a new unit goodman. filter its clean condensing unit its clean readings are low side 60psi hight side 180psi. it cools down really good but when temp. outdoor its above 90' it frezes.can you help me with your knowlege
@jccanatlan Did you up size your system when you replaced it? If you did and didn't make the proper adjustments to your duct system, you might want to.
Goodman and Amana have great units, they may not have such a big name as Carrier or Trane, but tell the customer they have a 10 yr compressor guarantee with Goodman and a lifetime guarantee with Amana PLUS its great equiptment when installed properly. Not to mention they have awesome tech support unlike Trane
Dr z , i have been bumping my head with this ac unit, here is the problem, Ac filter is new, temp is set on 74 but temp is not moving from 78 and the unit is constantly running, i checked for frozen pipes and i shut my unit off for few hrs.
i turned unit on after unfreezing pipes ,Now temp is stuck at 82 .
does that mean i need freon or i have to clean my condenser.
this is all happening this spring after huge winter storm in dc.
@rahultalwar07 The freezing suction line tells me that you probably have either an excessively dirty air filter, a bad blower motor, or a refrigerant undercharge.
and ya it was caked with cat hair no air flow was getting across the evaporator coil . any ways like the stuff you put out for the viewers that are getting started in this trade . wish you were around when i got in the trade 11 years ago lol
DRz I just ran into your video today and you gave me a flash back of a call some time ago . went to a call the unit wasnt cooling every thing was running out side filter was freezing and the evaporator coil was frozen as well . I checked the filter and it was good. so at first i was like what the ???? is going on lol then i seen a cat come out where the retrune grill was off and i just busted up . the guy told me thats where his cat sleeps . so i had to take out the evaporator coil
The quickest way to defrost a frozen evaporator coil is to turn the heat on. Let the heat run for 5 - 10 minutes and the majority of the ice will melt. You can judge how fast the coil is thawing by the flow of water out of your drain. If it's hot in your house (which is why the service call was initiated) then the thermostat may have to be bypassed or raised to its highest setting. Be careful not to let water get on electrical components and ensure the blower is not full of water.
PLEASE STOP,, CALLING REFRIGERANT FREON,, i dont think i need to go into the history of refrigerants,, or dupont chemicals,, this is something you should know as a student,, or in the HVAC industry,, no offense (Dr.z) ur exempt,, just for all you up and coming techs,, REFRIGERANT !!!!
All the guys in my shop call it freon. They are all old school though. I call it both. I talk to customers and say refrigerant and they look at my with a blank look, then I say freon and they understand.
I don't understand.. Why would both the condensore radiator and the evaporator radiatior both be iced over? It is one or the other .. one gets warm, the other gets cold, that is how a compressor works..... Evaporator coil could get frozen is in AC mode ... Condenser coil could get frozen if in Heat mode..
Right? I'm no expert, just a smartass student... I don't get it . What's a suction line? Obviously not the freon lines?
The evaporator is the coil that could freeze over in the cool cycle if you have a malfunctioning indoor blower motor or if the system is low in refrigerant or if the air filter is excessively dirty or if the evaporator coil is excessively dirty.
The suction line is the line where the refrigerant travels after it's left the evaporator coil and is headed to the compressor.
The condensing coil can freeze over in the heat cycle if it's excessively dirty or if the system fails to go into defrost.
Oh ok I get it now! Ok, yes I was confused about the suction line on the heatpump being frozen over, as well as the indoor coil .. But I understand now .. If the indoor coil gets frozen over ,then the return line from that coil back to the heatpump can get frozen too (cus there is still a lot of cold in the freon floating back to the heatpump .. and heat conductivity and stuff).
Typically, an iced up evaporator is caused by low air volume, due to a dirty air filter, a malfunctioning blower, low refrigerant charge or a grossly over charge.
Those are 2 reasons. If its a blower motor try replacing it yourself. Bring the motor in to a motor shop and they will match it up. If it's freezing up, it could be more than just low on freon. Always call a tech for this.
are you sure low on refrigerant does not cause icy evaps is over charge that causes this problem because of the low superheat? correct me if im wrong
I only work in Commercial hvac and refrigeration and this happens alot. A walk in low of refer will freeze up. Roof top units freeze up too. Depends on where you live and humidity. Oh and NEVER thaw a roof top unit with hot water, water will drip in the return and set off the fire alarm during a lunch rush. Never good.
My window unit is not working as efficiently as it should be. I have taken AC classes 1 through 5 and I am certified to recover refrigerant but, I have no field experience, other then classroom training. I want to fix my AC. I figure if I can't fix MY OWN ac, I shouldn't be fixing anyone's.
The inlet and outlet of the evaporator is icing up really fast. It's 12,400 btu's. It should be cooling my apartment but it hardly cools 1 room. I got a set of gauges, but thats about it. Please help Doc!
You might have a refrigerant leak. You'll have to find and repair the leak before adding refrigerant. Actually, you'll have to recover all of the refrigerant before repairing the leak then once you've made the repair, you have to put the system into a deep vacuum with a vacuum pump. Then you'll be able to weigh in the charge.
Well I guess I need to get that stuff eventually. Should I buy my own recovery machine? Vacuum pump? Multi-meter? I thought the gauges were pricey! I'm sorry if these are stupid questions but I want to learn. And, since the unit does cool a little, would I be able to use soap bubbles to leak check or would it need more pressure? Should I buy new or used?
OK. Last stupid question...what exactly should I get? Do you know of any tool kits or maybe a good list of tools a good repair guy should have? What should I have in my tool box exactly? If you don't mind. =)
u must not have paid any attention is school, because window shakers have no ports, there for u cnt charge/recover gas. go to home depot with 100 bucks and just buy another one...o yeah go back to school
Don't forget to check the supply grills!! they must be open to move air Across the coil. I've had three calls this year due to closed supply grills.....
from the compressor. i managed to start the air conditioner and every once in a while the compressor would do a loud noise and shut itself up and the fan would be running quietly
coils are cleaned, filter is cleaned, blower is turning, last saturday the condenser unit suddenly began to make a very loud noise and shutted off itself. no one turned it off.
Sounds overcharged to me, Loud noise plus no compressor operating equals relief valve going off and compressor overload opening because It is hot as a rocket. Restrictions, locked up compressor or bad capacitor can be a similar service call.
Actually, on a mini-split, both lines are low pressure. The metering device for the indoor coil is located in the outdoor unit. You're right that it's a different design than a regular split system.
You need to figure out why the evaporator is icing up. It could be a dirty air filter or a dirty evaporator coil or a is the blower motor isn't turning or if you're low in refrigerant.
An air conditioner is sized on the (mean) temp for your area. If the average of your area is 88 degrees lets say in summer.. then 100 degrees outside your unit will run its ass off all day and not really seem like its cooling that great. The point is the way they are sized is to keep the humidity out. If they ran and shut off every 7 minutes then you wouldn't have a compressor last its 15 year average b/c of short cycling plus not pulling the humidity out.
ive got a heil a/c unit that i have a problem with. when you feel the suction line it is hardly even cool but when it first comes on it gets really really cold but about 10-15 sec later it is just cool again what is wrong
Believe it or not, it could be normal unless your a/c isn't able to keep up with the setpoint. Then again, it could be a sign that the system is low in refrigerant.
If your air conditioner keeps up with the thermostat set point, your system is probably sized right. It really doesn't matter if your air conditioner stays running all day long. If it doesn't keep up then you might want to call an a/c company and ask them to do a heat load calculation on your home to see what the proper size should be.
A lot of times upstairs units run all day long and typically on a very hot day it's not unusual to see high 70s even close to 80 on extreme days. Depends what the load is and what region you are in.
I always turn the condenser off and run the fan to blow the humid air from within the house over the frozen coil to help de-thaw it...is this method incorrect for any reason?
I had a 2 ton compressor replaced with a 2.5 ton compressor. The HVAC company who did it said that it was compatible with my air handler and coil.
They were right. However, it required that a "piston kit" be installed at the evaporator coil. This is also known as an "orifice kit" or "flowrater". They didn't install it when they installed the 2.5 ton compressor.
Mine always does that :-( the repair man can't even fix it I'm serous we half to turn it off all the time and go 76% of the summer without air conditioning :-( we don't have much money to replace it and it's (Not) been fixed like 10 times in the 4 years we have been at this house but the next time it breaks down we are replacing it =D (when ever that will be...) it's a 1997 Good Man (Bad Man!) heat pump.
Ya, it's retarded they can't even fix it, in fact it got so bad we had to get a new one about 3 weeks ago for like $6.000 but theres some government program now kind of like cash for clunkers but for A/C's you just buy an Energy Star A/C then only pay 50% from what I hear but it's just stupid they could not fix it. Besides we needed it fixed because it's a heat pump to and I live in gainesville ga It doesn't get to could but i freezes alot in the winter around here and gets kinf of cold.
If a coil ices over like the one in this video, dose the level of liquid evaporation decrease and allow more liquid to return back to the compressor? potentially damaging it?
or is that just dependent on the high/low pressure diff and it'll evaporate at any surface temp?
You're right on both accounts. But, mainly, if your superheat is too low to have evaporated all of the liquid, you'll get liquid back to the compressor.
well DrZarkloff, I really appreciate these videos I am an HVAC Tech in TX. last friday I came across a unit from the early 80s that kept freezing up. I pumped down unit and cleaned the a coil. the maintenace guy replaced the fan motor, but had it in low spd. I wired it to high speed, I replaced filter dryer, and blew the line with nitrogen, replaced shrader valves, vacumed the lines and released the r-22, turned on unit and in 5 min. it froze up. I am puzzled. thank you for reading.
I'd first check to see what kind of high side pressures you're getting. If the high side seems to be low then you could have an under charge or If the indoor coil has a TXV then the power head could be bad or you might have some trash in the body of the TXV.
yet letting r-22 out is illegal but thats not the type of release I did sorry to confuse you. beaver ,and dr zarloff. what I found is the motor the maintenace guy replaced the motor was blowing in reverse. thank you for your responce and time sir.
have been looking over your vids for a couple of days now. I think this piece helps with my problems. Our central heat is about 10 years old. WHEN it cools, it will run you out of the house! Problem is, it only cools for maybe 2 hours at a time before the copper line outside freezes up at the very back of the unit and on up the line. Trying to figure this out myself because times are tight. I am going to clean the coils and then have freon added. Any other advice?
need help mr.z. today at 4 in the morning i was hot an decided to check the unit. all the unit was running but no air was coming out of the unit so i went to sleep. 4 hours later I woke up an it was hot as hell. unit was running but still no air was coming out. when i did a close look to the condenser there was ice and went back an saw ice on the air handler again. i checked the filters an they were clean.
You might want to check to see if the blower in the air handler is actually turning. If not then you have either a bad blower motor or run capacitor and/or relay.
There are many reasons why your evaporator could be icing up. The blower motor might not be running or the air filter is too dirty or you have a bad TXV or you have an undercharge. You might want to start with these possibilities.
Dr Z . There is 1 thing i disagree with you ... In most cases if the blower motor its not running there will be so much heat pressure and that will cause the pressure switches to open and cut the power fitting the contactor and the compressor will stop. Hi Pressure - Low Pressure Normally closed .. Fan cycle swith 4 condenser motor in some units normally open... SORRY !!!
Not every system has high and low pressure switches. My Amana is a perfect example of this. That's why I chose to show this as an example. Also, I've seen many frozen evaporator coils due to a blower not running. Trust me: it happens.
Let me guess ! the blower motor is not running because is overheating and trips is thermal limit ,that resets after cools down.or the contactor on condensing unit is getting stuck. or A Bad board? if any.
What happens if the outside temp happens to be lower than the indoor set-point, wouldn't that also cause the evaporator to freeze up?
OriginalBladeHeart 6 months ago
@OriginalBladeHeart Probably not. Cold climate applications should have a variable speed condensing fan motor.
DrZarkloff 6 months ago
what if the suction line is hot?
TheProudamerican56 7 months ago
@TheProudamerican56 Then it sounds like you have a heat pump and it's in the heating cycle.
DrZarkloff 7 months ago
Good stuff with putting bassmaster in your clip!! And thanks for always getting us out of a jam:)
TheRon1119 7 months ago
@TheRon1119 Thanks for watching.
DrZarkloff 7 months ago
@ DrZarkloff-Thanks for the feedback. Actually, turns out that I had a bunch of problems that all happened at the same time. The condensate line was backedup. The air filters were dirty. When I ran the ac unit after defrosting the ice, I burned out the motor and the capacitor. To top it all off, I was actually low on freon. The ac guy thinks that I may have a freon leak. For now, we are just going to run it and see if the freon drains out in the next couple of days. Thanx again for the response.
mnash3 8 months ago
@mnash3 Good point. The problem could be multiple.
DrZarkloff 8 months ago
@DrZarkloff ...typically dosent a frozen suction line occur when the system is low on freon ?..also why are they phasing out r-22 ..is everything going to be high pressure 410a now?... and also if 410a is suppose to be ozone friendly why do u still need to recover it rather then just discharge it...thanks dr
S13noGRIP 3 weeks ago
My coils are iced up. All 3 filters were dirty. Replaced all 3 filters. I am not sure if I defrosted the ice before turning on the machine with the new filters so it iced up again. It's a reasonably new house; so I think that I am not likely low on freon. How long should I wait before I can turn on the ac unit after defrosting the ice? (By the way.... Great videos and thanks for sharing with everyone.)
mnash3 8 months ago
@mnash3 Give it 24 hours to be sure.
DrZarkloff 8 months ago
i love the song on this vid at the beginning!!
MrBeau0417 8 months ago
@MrBeau0417 Thanks. My nephew wrote and played it.
DrZarkloff 8 months ago
Thanks !!! I noticed the ice near the suction hose and lack of air flow through the house and suspected a iced over evaporator coli.. I checked the filters and the screen in front of it was so clogged I could not see through it !!!!
TheGeneralBraddock 9 months ago
@TheGeneralBraddock A clogged filter will cause the evaporator to ice up. Thanks for watching.
DrZarkloff 9 months ago
This has been flagged as spam show
I see the UV system label.... wonder if all the bacteria growth happened before or after the UV system was installed....? Probably shoulda cleaned it first....
onehourtech 9 months ago
I see the UV system label.... wonder if all the bacteria growth happened before or after the UV system was installed....? Probably shoulda cleaned it first....
onehourtech 9 months ago
love to see you do something like changing of a filter drier with a passive recovery or changing of acoil.
m57yugo 10 months ago
@m57yugo Do you mean a passive recovery machine? I used to use one. They work pretty good as long as you put the recovery tank into a bucket of ice.
DrZarkloff 10 months ago
@DrZarkloff I mean a passive recovery system dependent. when you close off both sides slow crack high side or low side I forgot and pack everything into the compressor til both gauges read zero.that way it gives you the ability to move the unit with out recovering the refrigerant.thus being able to replace filter drier without having to take out refrigerant.
m57yugo 10 months ago
Great videos...question, how long should a compressor run after the inside unit shuts off? I can't remember mine running as long as it has recently. I turn off the compressor circuit breaker so it won't burn up till I can get tech out here.
WhatsUpDaddio 10 months ago
@WhatsUpDaddio The compressor should shut off before the air handler.
DrZarkloff 10 months ago
Dr Z, I really like your short videos. My question to you is this: I am thinking about doing an HVAC program down here in Florida, is it something hard to learn? I know a little about the field and some basic parts, but not a solid knowing. I have very little technical training, and no electrical training. I have a high school diploma. Thank you.
kareemir 1 year ago
@kareemir Embrace the change of career choice. Don't freak out on the first day of class. It will be well worth it.
DrZarkloff 11 months ago
what the good doctor is saying is that this particular system could either have iced/frosted up due to mechanical (leak search needs to be performed) or electrical failure (capacitor on indoor fan motor possibly). that's why it's money well spent if you have a maintenance agreement with a well respected local HVAC company where they come to your house twice a year to perform a heat or cool tune up.
woode1965 1 year ago
Dr. Z, I was checking out a 3 phase carrier commercial package unit air conditioner straight cool. It has two compressors, and one of the compressors is iced up and the other compressor runs warm. How does these compressor work.
rbu2m 1 year ago
@rbu2m It sounds like you have a refrigerant leak in the one that's iced up.
DrZarkloff 1 year ago
This has been flagged as spam show
Sir, I have got to ask you that I have installed Mitsubishi 8TR unit, In this out door unit's Suction Accumulator is getting ice up will you please tell me what cause could it have?
2170509 1 year ago
I had situations where a branch damper was closed mysteriously,or maybe a plastic bag laying up against the only return in the home,or the homeowners closed all the registers downstairs to get more airflow upstairs.Just to point a few more scenario's that could happen but not likely!
demmylowther 1 year ago
@demmylowther Thanks for the added possibilities.
DrZarkloff 1 year ago
Thank you Dr.Zark!
tony5996e 1 year ago
Hey Doc whats the replacement gas for R22 for an 100kg charge system would you recomend at this point in time taking into account performance[drop in]
twinspur 1 year ago
@twinspur There are a few different drop ins. You could use NU22 on residential comfort cooling systems. You might want to try R 422a on medium and low temperature apps.
DrZarkloff 1 year ago
@DrZarkloff duponts refrigerant monopoly starts again :)
GrantLogan2 1 year ago
if i found slight electrical ground in a hermetic motor thah is operating ok do i have to replace it or do naothing, sorry this is a test question but i have no idea common sense tell me change leave it like this but im not sure if this is the right thing to thank you
alfebre1 1 year ago
@alfebre1 It's really a good idea to replace the motor because a motor that is reading ohms to ground will over amp and could put stress on relays and relays that are integrated on expensive control boards. Hermetic compressors with ohms to ground will build up acids that will eat away the winding insulation. The compressor will be an acid burn out and the entire system will have to be flushed. The repair will be very costly.
DrZarkloff 1 year ago
great video
MrRlimon75 1 year ago
HI DR. Z thank you so much for all your videos... i will love to see videos of the new sistem R410A and how it works if thats not a problem for you. thanks
jccanatlan 1 year ago
@jccanatlan Thanks for watching. I'm usually stuck fixing R22 systems. I only have a few R410a systems at the schools that I take care of.
DrZarkloff 1 year ago
hello i bin havin problems with my AC well it runs but no cool air comes out only normal air and it has bin like 110 hot outside and my aparment is very humid and real hot we sweat a lot its real bad i go to sleep sweating and wake up sweating i live in this aparment and i have call for help and theres this dude who comes and just gos in my aparment and in 3 min the cold air is running and then
leonaruby27 1 year ago
@leonaruby27 I hate it when that happens. I think that air conditioners should be broken when the tech shows up at the door.
DrZarkloff 1 year ago
DrZ I have to say you do a great job covering all the basics of HVAC troubleshooting. I would like to add one thing to this video however. If you find a filter that is dirty enough to cause enough of an air flow problem that your coil freezes up, it may not be a bad idea to check the evaporator to see if it is stopped up as well. simply putting a new filter on it may not be a 100% fix for the problem. -Hope to see more new videos!
Az71lover 1 year ago
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figgy1872 1 year ago
Good Evening DrZarkloff. I am having ice at the air handler and the coils. I have changed my filters in the past on a monthly basis. I had a newbie tech come look at the system and they said that they believed it was the TXV valve...is this something that is normal or not. I do not want to buy a part that is not needed. They said they believed it was this because the pressure had gone down while he was here. Need help before i buy a part.
figgy1872 1 year ago
@figgy1872 I have to admit that it sounds more like the system is under charged. What was the suction pressure?
DrZarkloff 1 year ago
@DrZarkloff the pressure is 22/165
figgy1872 1 year ago
@figgy1872 Your system is low in refrigerant.
DrZarkloff 1 year ago
@figgy1872 yeah I agree with DrZ. it doesn't sound like a TXV problem to me either. one thing to take in consideration before just pumping some gas back into the system, is it had to go somewhere. it needs to be leak checked.
Az71lover 1 year ago
thanks for these great videos DrZarkloff ... if you dont mind I have a quick question. My AC motor runs and I feel a faint breeze coming from the ducts, but nothing more ... the breeze feels cool, but the AC runs for far too long. From this can you tell if it's a problem I can fix myself or will I need to call a tech out?
Anamacha 1 year ago
@Anamacha It's always a good idea to have a tech look at your system at least once per year. Typically, you should only feel a faint breeze coming from the grill.
DrZarkloff 1 year ago
Thank you it is a good demonstration..
The good thing is most AC units have low pressure cut outs that will trip compressor when the air flow is blocked or stopped..
asokasl 1 year ago
Thank you for posting this video Dr. Z! Helps me understand more how my HVAC systems works. I have one question thought. My Evap Coiler sits on a plastic drip pan. It seems to not be draining properly causing the drip pan to overflow with water. What can I use to clean out the clogged "draining pipe"? Any feedback would be greatly appreciated.
papiextasy 1 year ago
@papiextasy Check out my HVAC Might Pump video.
DrZarkloff 1 year ago
Dr. Z, I like all the video's you've made about HVAC...... I got a question for you or anybody that knows something about a Compressor Air Dryer that has a R407C 9.6lbs of freon.... I'm getting a high pressure alarm on the unit and also a Pressure Integral alarm( An auto off switch for the compressor so that it would not burnt up the compressor)..... Could you tell me what are the possibilities that could cause this problem????
Thanks
rhemix27 1 year ago
@rhemix27
You should check the condenser coil and condenser fan. the most common thing I find are the condenser coil is dirty.
gixer2000 1 year ago
@gixer2000 hey thanks for the help there.... I've fixed the problem by the way.... It had an open high pressure switch and when I've replaced it, the Domnick Hunters Air dryer had been working properly since then.....
thanks again
rhemix27 1 year ago
Thanks so much for your series, it really helps us learn how to maintain our homes. I just spent most of the day fixing our frozen coils (caused by a reason not mentioned in your clip). So much hair and lint had worked its way past the filter and onto the fins that no air was getting through whatsoever. Not wanting to use a hose in my cupboard, I removed it all by hand :(. I believe my mistake was years of changing the filter without turning off the HVAC in a home full of molting dogs and cats!
94dgrif 1 year ago
@94dgrif Thanks for watching.
DrZarkloff 1 year ago
@DrZarkloff I had the same problem with hair. I found out the previous owners had refinished the basement and they added the return by tapping into the back of the motor trunk bypassing the filter 90* on the side of the trunk. The cat hairs fed directly into th fan [and the house]. No wonder the cat loved to rub on the return vent! I solved it by a making a custom fit filter but now I have to make one every month! lol
Murster 1 year ago
@Murster Pet hair can be pretty nasty. LOL
DrZarkloff 1 year ago
Hey Dr.Z, do you also work on heating units or just AC?
DVA3952 1 year ago
@DVA3952 I work on Air conditioners, heat pumps, chillers, and refrigeration systems of all sizes.
DrZarkloff 1 year ago
Thanks Dr.Z!!!!!
estrelladelnorte1308 1 year ago
Semi-shortcut i like to take when defrosting a residential split system is to let the IDBM run, that way you dont wait an hour to defrost. While you wait on the evaporator coil to defrost, spray the condenser coil with a water hose. Since your servicing unit add a new filter just incase
**I know this may be common knowledge to techs BUT im assume alot of ppl look on youtube for do it yourself instructions
GREAT videos, more chiller system videos w/ cooling tower plz
SUBSCRIBED! :)
chevychemo 1 year ago
@chevychemo Thanks for watching. I'll do more chiller videos this summer.
DrZarkloff 1 year ago
I like your videos I have tought of doing some my self I always say there are 2 reasons for icing 1 poor airflow IE duct work, dirty coil, blower problems and so on 2 poor refrigerant feeding the coil IE low charge, bad TXV ,outdoor temp too cold
racingrobert1 1 year ago
@racingrobert1 Thanks for watching. Good luck.
DrZarkloff 1 year ago
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avenueg 1 year ago
lol
ebozeman36 1 year ago
Dr.Z thanks for all your great videos.I am an HVAC/R student at a local trade tech college and i have learned alot from your videos too.Is it possible that the reason you have a frozen evap. coil is because your metering device is defective?
hondagoal 1 year ago
@hondagoal Yes. a faulty metering device will cause this.
DrZarkloff 1 year ago
dr z once again thank you for your help. and no i didn't my old unit was a 5ton 10 seer. and the new unit 13 seer. and i replaced only outdoor unit.
any other sugestions on how to solve this problem.
that only change i did is on suction line it's a 3/4 and i add small piece of 5/8 copper to rich to the unit.
jccanatlan 1 year ago
dr z thank you so much for all your videos. this is my problem i replace my 5 ton. unit outdoors and its been frozen its a new unit goodman. filter its clean condensing unit its clean readings are low side 60psi hight side 180psi. it cools down really good but when temp. outdoor its above 90' it frezes.can you help me with your knowlege
jccanatlan 1 year ago
@jccanatlan Did you up size your system when you replaced it? If you did and didn't make the proper adjustments to your duct system, you might want to.
DrZarkloff 1 year ago
amana/goodman is crap equipment
aalfone1 1 year ago
@aalfone1
Goodman and Amana have great units, they may not have such a big name as Carrier or Trane, but tell the customer they have a 10 yr compressor guarantee with Goodman and a lifetime guarantee with Amana PLUS its great equiptment when installed properly. Not to mention they have awesome tech support unlike Trane
chevychemo 1 year ago
That was our problem...lol...see the video I attached as a response. He admitted he hadn't changed it in two months...lol
TexasMom17 1 year ago
Dr z , i have been bumping my head with this ac unit, here is the problem, Ac filter is new, temp is set on 74 but temp is not moving from 78 and the unit is constantly running, i checked for frozen pipes and i shut my unit off for few hrs.
i turned unit on after unfreezing pipes ,Now temp is stuck at 82 .
does that mean i need freon or i have to clean my condenser.
this is all happening this spring after huge winter storm in dc.
please help
rahultalwar07 1 year ago
@rahultalwar07 The freezing suction line tells me that you probably have either an excessively dirty air filter, a bad blower motor, or a refrigerant undercharge.
DrZarkloff 1 year ago
@rahultalwar07 the units probably undersized retard
aalfone1 1 year ago
and ya it was caked with cat hair no air flow was getting across the evaporator coil . any ways like the stuff you put out for the viewers that are getting started in this trade . wish you were around when i got in the trade 11 years ago lol
chris1lov 2 years ago
lol
DRz I just ran into your video today and you gave me a flash back of a call some time ago . went to a call the unit wasnt cooling every thing was running out side filter was freezing and the evaporator coil was frozen as well . I checked the filter and it was good. so at first i was like what the ???? is going on lol then i seen a cat come out where the retrune grill was off and i just busted up . the guy told me thats where his cat sleeps . so i had to take out the evaporator coil
chris1lov 2 years ago
That's a good story. lol
DrZarkloff 2 years ago
with low air flow, we get increased drop in temp and increased moisture removal?
blissJesus 2 years ago
Yes until the evaporator freezes.
DrZarkloff 2 years ago
with lower air flow, we get increased temp drop and increased moisture removal?
blissJesus 2 years ago
If you're not sure the expansion device is functioning correctly would it be best to weigh in the charge?
Scrat335 2 years ago
It's always best to weigh in the charge on package systems and mini-splits.
DrZarkloff 2 years ago
What about a restriction caused by the metering device?
richyrich4566 2 years ago
True. That can cause the evaporator to freeze, too.
DrZarkloff 2 years ago
or you could have a leak
thejeztar 2 years ago
@thejeztar Low ref usually = leak somewhere. Check it all.
Scrat335 2 years ago
The quickest way to defrost a frozen evaporator coil is to turn the heat on. Let the heat run for 5 - 10 minutes and the majority of the ice will melt. You can judge how fast the coil is thawing by the flow of water out of your drain. If it's hot in your house (which is why the service call was initiated) then the thermostat may have to be bypassed or raised to its highest setting. Be careful not to let water get on electrical components and ensure the blower is not full of water.
Rueuhy 2 years ago
how would water get into the blower?
linoleumcarving 2 years ago
PLEASE STOP,, CALLING REFRIGERANT FREON,, i dont think i need to go into the history of refrigerants,, or dupont chemicals,, this is something you should know as a student,, or in the HVAC industry,, no offense (Dr.z) ur exempt,, just for all you up and coming techs,, REFRIGERANT !!!!
hvacwulf 2 years ago
All the guys in my shop call it freon. They are all old school though. I call it both. I talk to customers and say refrigerant and they look at my with a blank look, then I say freon and they understand.
sevengreengoats 2 years ago
I don't understand.. Why would both the condensore radiator and the evaporator radiatior both be iced over? It is one or the other .. one gets warm, the other gets cold, that is how a compressor works..... Evaporator coil could get frozen is in AC mode ... Condenser coil could get frozen if in Heat mode..
Right? I'm no expert, just a smartass student... I don't get it . What's a suction line? Obviously not the freon lines?
danwat1234 2 years ago
The evaporator is the coil that could freeze over in the cool cycle if you have a malfunctioning indoor blower motor or if the system is low in refrigerant or if the air filter is excessively dirty or if the evaporator coil is excessively dirty.
The suction line is the line where the refrigerant travels after it's left the evaporator coil and is headed to the compressor.
The condensing coil can freeze over in the heat cycle if it's excessively dirty or if the system fails to go into defrost.
DrZarkloff 2 years ago
Oh ok I get it now! Ok, yes I was confused about the suction line on the heatpump being frozen over, as well as the indoor coil .. But I understand now .. If the indoor coil gets frozen over ,then the return line from that coil back to the heatpump can get frozen too (cus there is still a lot of cold in the freon floating back to the heatpump .. and heat conductivity and stuff).
Ok thanks.
danwat1234 2 years ago
Very good.
DrZarkloff 2 years ago
i thought it was and overcharge with refrigerant that causes evaps to ice up or low air flow preventing heat transfer in the coil.
correct me if im wrong please because low refrigerant would not have enought refrigeration effect to ice up the evap? please reply
jmiguel3889 2 years ago
Typically, an iced up evaporator is caused by low air volume, due to a dirty air filter, a malfunctioning blower, low refrigerant charge or a grossly over charge.
DrZarkloff 2 years ago
Those are 2 reasons. If its a blower motor try replacing it yourself. Bring the motor in to a motor shop and they will match it up. If it's freezing up, it could be more than just low on freon. Always call a tech for this.
thebacon1lb 2 years ago
are you sure low on refrigerant does not cause icy evaps is over charge that causes this problem because of the low superheat? correct me if im wrong
jmiguel3889 2 years ago
I only work in Commercial hvac and refrigeration and this happens alot. A walk in low of refer will freeze up. Roof top units freeze up too. Depends on where you live and humidity. Oh and NEVER thaw a roof top unit with hot water, water will drip in the return and set off the fire alarm during a lunch rush. Never good.
thebacon1lb 2 years ago
drz when replacing a blower motor that has a belt drive what must i do to make sure i have the right tension on the belt and any other advice on this
simsrunit 2 years ago
You should have about a half an inch of slack when you press down on the belt between the two pulleys.
DrZarkloff 2 years ago
Had one today that was iced up. High speed on the blower motor was burned out. Solution: replace blower motor.
Great videos Doc.
CuyahogaJoe 2 years ago
this is good video.. Keep it up.. upload more technical about this HVAC.. I love it.
crisb20 2 years ago
The very first thing to do is to turn it off!! lol. Keep the great videos coming. They are great for my new techs.
bradbbac 2 years ago
My window unit is not working as efficiently as it should be. I have taken AC classes 1 through 5 and I am certified to recover refrigerant but, I have no field experience, other then classroom training. I want to fix my AC. I figure if I can't fix MY OWN ac, I shouldn't be fixing anyone's.
The inlet and outlet of the evaporator is icing up really fast. It's 12,400 btu's. It should be cooling my apartment but it hardly cools 1 room. I got a set of gauges, but thats about it. Please help Doc!
crjb78 2 years ago
You might have a refrigerant leak. You'll have to find and repair the leak before adding refrigerant. Actually, you'll have to recover all of the refrigerant before repairing the leak then once you've made the repair, you have to put the system into a deep vacuum with a vacuum pump. Then you'll be able to weigh in the charge.
DrZarkloff 2 years ago
Well I guess I need to get that stuff eventually. Should I buy my own recovery machine? Vacuum pump? Multi-meter? I thought the gauges were pricey! I'm sorry if these are stupid questions but I want to learn. And, since the unit does cool a little, would I be able to use soap bubbles to leak check or would it need more pressure? Should I buy new or used?
crjb78 2 years ago
I guess that if you plan to do the work then you'll have to buy or borrow the equipment. Used equipment is okay as long as it work good.
DrZarkloff 2 years ago
OK. Last stupid question...what exactly should I get? Do you know of any tool kits or maybe a good list of tools a good repair guy should have? What should I have in my tool box exactly? If you don't mind. =)
crjb78 2 years ago
Please check out my HVAC Basic Tools 1 and HVAC Basic Tools 2 videos.
DrZarkloff 2 years ago
u must not have paid any attention is school, because window shakers have no ports, there for u cnt charge/recover gas. go to home depot with 100 bucks and just buy another one...o yeah go back to school
JOHNNYTWIGS112 2 years ago
ha, you called it. the kids over his head, fixing a banger. ridicuolous
SparkyCollins77 2 years ago
Uh, you can install your own valve, it's not that hard, takes five minutes. BTW, your gay. Stop insulting that man and learn how to spell dumbass!
dwanderlich 2 years ago
lol..i just fixed mine..just use a peircing valve. did you go to school? lol
lfoldi 2 years ago
Don't forget to check the supply grills!! they must be open to move air Across the coil. I've had three calls this year due to closed supply grills.....
NellySon021 2 years ago
Keep up good work!!!!!! Great videos !!!! I have learned soo much!!! Thanks!!!!
animaloverca 2 years ago
Thanks for watching.
DrZarkloff 2 years ago
from the compressor. i managed to start the air conditioner and every once in a while the compressor would do a loud noise and shut itself up and the fan would be running quietly
acthetech 2 years ago
It sounds like the compressor has some sort of mechanical problem like a broken shaft. It does sound like it time for a new compressor.
DrZarkloff 2 years ago
coils are cleaned, filter is cleaned, blower is turning, last saturday the condenser unit suddenly began to make a very loud noise and shutted off itself. no one turned it off.
acthetech 2 years ago
Do you think the noise was coming from the fan or the compressor?
DrZarkloff 2 years ago
Sounds overcharged to me, Loud noise plus no compressor operating equals relief valve going off and compressor overload opening because It is hot as a rocket. Restrictions, locked up compressor or bad capacitor can be a similar service call.
TheWasteofmytime 2 years ago
here (greece) most of the a/c units are wall mounted split type....ice appears only at the hi pressure side of the unit......
Giannis25307 2 years ago
Actually, on a mini-split, both lines are low pressure. The metering device for the indoor coil is located in the outdoor unit. You're right that it's a different design than a regular split system.
DrZarkloff 2 years ago
i have problems with it. once the line is frozen it cuts the airflow of the unit so what should i do
acthetech 2 years ago
You need to figure out why the evaporator is icing up. It could be a dirty air filter or a dirty evaporator coil or a is the blower motor isn't turning or if you're low in refrigerant.
DrZarkloff 2 years ago
Now due to global warming and some hot years then yeah maybe they need to change their calculations but for now thats just the way that they are.
hemiownzu 2 years ago
An air conditioner is sized on the (mean) temp for your area. If the average of your area is 88 degrees lets say in summer.. then 100 degrees outside your unit will run its ass off all day and not really seem like its cooling that great. The point is the way they are sized is to keep the humidity out. If they ran and shut off every 7 minutes then you wouldn't have a compressor last its 15 year average b/c of short cycling plus not pulling the humidity out.
hemiownzu 2 years ago
when customers call in I tell all to turn them off and run the fan untill I get there. Saves a ton of time.
hemiownzu 2 years ago
Good thinking. Now if I could get the teachers at the schools that I service to do the same, I'd be able to save some time, too.
DrZarkloff 2 years ago
ive got a heil a/c unit that i have a problem with. when you feel the suction line it is hardly even cool but when it first comes on it gets really really cold but about 10-15 sec later it is just cool again what is wrong
frrd77 2 years ago
Believe it or not, it could be normal unless your a/c isn't able to keep up with the setpoint. Then again, it could be a sign that the system is low in refrigerant.
DrZarkloff 2 years ago
well on a hot day it will run just about all day never really cooling the house off i dont think the unit is big enough to start with
frrd77 2 years ago
If your air conditioner keeps up with the thermostat set point, your system is probably sized right. It really doesn't matter if your air conditioner stays running all day long. If it doesn't keep up then you might want to call an a/c company and ask them to do a heat load calculation on your home to see what the proper size should be.
DrZarkloff 2 years ago
A lot of times upstairs units run all day long and typically on a very hot day it's not unusual to see high 70s even close to 80 on extreme days. Depends what the load is and what region you are in.
hemiownzu 2 years ago
Great video. Thanks. :)
rayman4449 2 years ago
I always turn the condenser off and run the fan to blow the humid air from within the house over the frozen coil to help de-thaw it...is this method incorrect for any reason?
Cambria2007 2 years ago
Your method works, too.
DrZarkloff 2 years ago
Be careful not blow water out of the primary pan and into the insulation or duct work. Otherwise this does speed up the thawing process.
ERUTANGIS 2 years ago
Guess what caused this in my system?
I had a 2 ton compressor replaced with a 2.5 ton compressor. The HVAC company who did it said that it was compatible with my air handler and coil.
They were right. However, it required that a "piston kit" be installed at the evaporator coil. This is also known as an "orifice kit" or "flowrater". They didn't install it when they installed the 2.5 ton compressor.
ForcedToSignUp 2 years ago
Thanks for mentioning this.
DrZarkloff 2 years ago
Mine always does that :-( the repair man can't even fix it I'm serous we half to turn it off all the time and go 76% of the summer without air conditioning :-( we don't have much money to replace it and it's (Not) been fixed like 10 times in the 4 years we have been at this house but the next time it breaks down we are replacing it =D (when ever that will be...) it's a 1997 Good Man (Bad Man!) heat pump.
2010mustang1 2 years ago
I would start by cleaning the evaporator coil. If it still froze up after cleaning the coil, I'd check out the blower motor and or run capacitor.
DrZarkloff 2 years ago
that dosent speak to good of your repair man any desend AC tech should be able to fix your AC i say you change service tech to one that knows
jmiguel3889 2 years ago
Ya, it's retarded they can't even fix it, in fact it got so bad we had to get a new one about 3 weeks ago for like $6.000 but theres some government program now kind of like cash for clunkers but for A/C's you just buy an Energy Star A/C then only pay 50% from what I hear but it's just stupid they could not fix it. Besides we needed it fixed because it's a heat pump to and I live in gainesville ga It doesn't get to could but i freezes alot in the winter around here and gets kinf of cold.
2010mustang1 2 years ago
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2010mustang1 2 years ago
If a coil ices over like the one in this video, dose the level of liquid evaporation decrease and allow more liquid to return back to the compressor? potentially damaging it?
or is that just dependent on the high/low pressure diff and it'll evaporate at any surface temp?
Aussie50 2 years ago
You're right on both accounts. But, mainly, if your superheat is too low to have evaporated all of the liquid, you'll get liquid back to the compressor.
DrZarkloff 2 years ago
I had a feeling that was the case, thanks for the input!
Aussie50 2 years ago
thats what i been taught so i agree with you
jmiguel3889 2 years ago
well DrZarkloff, I really appreciate these videos I am an HVAC Tech in TX. last friday I came across a unit from the early 80s that kept freezing up. I pumped down unit and cleaned the a coil. the maintenace guy replaced the fan motor, but had it in low spd. I wired it to high speed, I replaced filter dryer, and blew the line with nitrogen, replaced shrader valves, vacumed the lines and released the r-22, turned on unit and in 5 min. it froze up. I am puzzled. thank you for reading.
bigdirty432 2 years ago
I'd first check to see what kind of high side pressures you're getting. If the high side seems to be low then you could have an under charge or If the indoor coil has a TXV then the power head could be bad or you might have some trash in the body of the TXV.
DrZarkloff 2 years ago
u relesed the r-22? isnt that illegal? lol
beaver1232 2 years ago
yet letting r-22 out is illegal but thats not the type of release I did sorry to confuse you. beaver ,and dr zarloff. what I found is the motor the maintenace guy replaced the motor was blowing in reverse. thank you for your responce and time sir.
bigdirty432 2 years ago
have been looking over your vids for a couple of days now. I think this piece helps with my problems. Our central heat is about 10 years old. WHEN it cools, it will run you out of the house! Problem is, it only cools for maybe 2 hours at a time before the copper line outside freezes up at the very back of the unit and on up the line. Trying to figure this out myself because times are tight. I am going to clean the coils and then have freon added. Any other advice?
imadamlambertimgay 2 years ago
Thanks for watching my videos. I'm glad that you've found them helpful. You might want to be sure that the air filter is clean, too.
DrZarkloff 2 years ago
need help mr.z. today at 4 in the morning i was hot an decided to check the unit. all the unit was running but no air was coming out of the unit so i went to sleep. 4 hours later I woke up an it was hot as hell. unit was running but still no air was coming out. when i did a close look to the condenser there was ice and went back an saw ice on the air handler again. i checked the filters an they were clean.
acthetech 2 years ago
You might want to check to see if the blower in the air handler is actually turning. If not then you have either a bad blower motor or run capacitor and/or relay.
DrZarkloff 2 years ago
i have change a compressor of 24000btu and the evaporator is icing why
salimnanhack 3 years ago
There are many reasons why your evaporator could be icing up. The blower motor might not be running or the air filter is too dirty or you have a bad TXV or you have an undercharge. You might want to start with these possibilities.
DrZarkloff 3 years ago
Dr Z . There is 1 thing i disagree with you ... In most cases if the blower motor its not running there will be so much heat pressure and that will cause the pressure switches to open and cut the power fitting the contactor and the compressor will stop. Hi Pressure - Low Pressure Normally closed .. Fan cycle swith 4 condenser motor in some units normally open... SORRY !!!
0917caicas 3 years ago
Not every system has high and low pressure switches. My Amana is a perfect example of this. That's why I chose to show this as an example. Also, I've seen many frozen evaporator coils due to a blower not running. Trust me: it happens.
DrZarkloff 3 years ago
Let me guess ! the blower motor is not running because is overheating and trips is thermal limit ,that resets after cools down.or the contactor on condensing unit is getting stuck. or A Bad board? if any.
Congrats i like your vids!
tizcareno13 3 years ago
Thanks. I disabled the blower motor for the sake of making this video.
DrZarkloff 3 years ago
It might. It all depends on the suction line temperature. Systems with multiple