I like your HVAC videos as well as the machine tool ones. The first videos of yours I saw was the "silent" air compressor you made. Keep both kinds coming! Very good content always!
I have a Carrier 7A, almost identical in layout and design, that I needed to replace. Thanks for the great video, good straightforward information that gave me the extra confidence in doing it myself. I got lucky in finding parts that I got in a week instead of most suppliers quoting two month backorders right when winter is just beginning. Thanks Again!
Nice video, professionals, but someday dumb ass engineers will figure out evaporator coils installed before heat exchangers are rusting them out! Residential figured that out decades ago
Enjoyed watching a very professional replacement of a heat exchanger. Good job well done. Halligan you and Jim Pettinato are two great Italian repair men I have learned a great deal from. Thanks
thanks very much for this video. I'm about to change one of these right now. and never done it. i was worried i was gonna have to take the whole top off and blower assembly. nice work guys
One of the most asked questions I got from owners was, "How big does the hole have to get before it becomes a problem?" My reply was "When more than 4 customers croak in a 30 day period." I never did figure out why a fixed pot metal pulley would last 30 years and an adjustable cast iron pulley would dish out within a few. Keep'em warm, Greg.
I've noticed that the adjustable ones don't last as long as a fixed pulley. Also I don't know what it is with Grainger, but they don't seem to stock Browning pulleys anymore. The replacement ones I get are big and chunky and heavy. They don't have those reccesses and webs in the face. We installed 3 new Bryant units and the pulleys on the blower are plastic. We'll see how that turns out.
My theory is the engineers were being cheap bastards. No way a single A belt can handle the 2 hp motors and fans. Whenever it was time to change a pulley on any of them, York, Lennox, Carrier, I'd sell the customer the up sizing to a B belt conversion. The motor pulleys AND belts last way longer.
Really enjoyed this Greg, Thanks. Interesting that it took almost as much time to adjust the belt tension as it did to R&R the exchanger, plus more cookie strain. Never could understand why they don't put a jack screw on motor mounts to adjust them, for a couple of returns on the SM and a screw an nut, seems you'd get much finer adjustments and quicker. Thanks Again!
There is one, but the way they designed it the screw and nut are so close to the housing that you can only get like a 1/4 turn on it with the wrench so I don't use it. Thee best design on the belt tension I've seen so far is Trane. The smaller units have the motor plate secured with 2 small screws. Take out the screws and there is a large stud attatched to a cogged wheel. Loosen a locking not and turn the stud and the whole plate moves. The larger units have the same idea, but the cogged stud moves a third idler pulley that adjusts tension.
You guys don't have a video of where all the gaskets go on the actual heat exchanger??? I would of liked to see how it was done any links or other videos any where u guys know if where I can see
For training purposes I think you guys should show checking inlet press, manifold press and temperature rise. Polishes off a good repair. Otherwise great video guys.
Awesome stuff...one thing I saw was you trying to take the union off with the channel locks and you went the wrong way haha common mistake.. Thanks so much for the video though cause my boss was 100% going to tell the customer he doesn't feel comfortable and going to give them a price on a new rooftop... We changed one like 7 years ago when I just got into the trade and it was a mess ... It was a York and took a lonnnnng time.... We're def going to change the heat exchanger now because the unit is 13 years old and in good shape...we just put a condenser fan motor in last summer... I'm in Boston Massachusetts so maybe I'll see you around... Good stuff
That access door to the end of the heat exchanger, mans best friend, if -30 or -40 c, if another functioning unit near by, lol, I pull them off all the time to warm up👍
mychoclabwinston Yup though it's usually not my body that gets cold it's my hands. Especially when I have to take my gloves off to feel things. I warm my hands on the draft motor exhaust. Just make sure you don't put them too close.
A job well done Bud. Im telling you man I really like Carrier units. I totally hate York and Luxaire Heat exchanger job it takes me about a days work to complete. Great video
LOL, caught myself saying "Bless You" when you sneezed. Don't know how old this unit is but, if in parts warranty perhaps the load Vs btuh output is off causing short cycling.
took a few years to figure out why the Carrier HX's rust out so bad. The heat exchanger is down stream from the evap coil. When the AC is cranking on a nice hot, humid day in the summer, that heat exchanger is sweating profusely, inside and out. At least Carrier made em easy to change, cuz they don't last long in when summers are hot and humid.
Ahh, the fun times. I hated doing restaurants. There is less grit and grease/oil in the machine shop than most kitchens...LOL Worst I hate is chip fryers and servicing the burners (had a bit in one video).
We use that front one because it fits the air discharge hole perfectly and I want to get that sucker as hot as possible. Pull off the red wire to the thermostat, jump it out, and let the fan turn on using the sensor. That way it gets hotter than it usually would and I don't get the customer calling back with the "I smell something burning" service call.
Honestly I can't remember. We check gas pressure after we burn off and combustion if needed after that. The camera highlights any orange flame in the dull blue and any wind will also effect the color of flame.
You increased the fan speed to make the belt fit better on the pulley,but you never amped it see if it was ok and the bearing has even more tension now. I hope you went back to correct that with a new pulley and bearings.
Pretty Interesting video , once you get the junk out of the way the job goes real smooth . I got to ask what electrical supplier you use . Having trouble finding capacitors and hi lo switches for my lathe motor . Sounds like your on the north shore . I'm on the south shore . Have you tried Turner steel ? Not sure what their stock is . Steve
For a straight electrical supply we usually use Northeast Electrical. Capacitors I usually get at United Refrigeration. On the south shore there is one in Taunton. For the switches you can also try Grainger, but they tend to be expensive. I've not been to Turner, but I see their trucks on the highway all the time.
Don't get me wrong here though, Carrier makes 16-year shit and if you have only waited a few years you would have an ethical hole. Also note, with the pressure switch a true hole would make the gas not come on. That is a safety built into the inducer- pressure switch combination. It is a fail safe built into the units. You are not saving anyone by burning a hole with the torch. Everyone would have lived if you waited for the rust to kill it.
hellbirdman These as with most carrier rooftops have no pressure switch for air proofing of the draft motor. They only have hall effect sensors to sense draft motor rotation. As long as that motor spins the unit will fire. The only safety is a temp sensor roll out switch mounted above the burner rack.
Yea, it's all the screws. Replace an older York HTEx. More friggin screws then a cat house. Replace ANY with snow on the roof and you find half the screws (and some tools too!) when the snow finally melts. Oh the fun............
Nice PROFESSIONAL job Thanks for the Video I did notice that the site is right next to one of your favorite places - Dunkin Donuts! I noticed you fellas left the old fan belt in the machine is this common practice? - my thought here is that if there was a problem with the new one then the old one could be used in a pinch
We like to leave an old one in there that isn't broken as a bit of an emergency belt. For those days when you get the 5 o' clock service call on a friday and you don't have a belt that will fit at least you can get them back running.
Greg, Shit! You damn near have to take the thing apart to install just the heat exchanger! Like I said before, somewhere a design engineer is laughing his ass off! Thanks for the video! Have a good one! Dave
That was fast! Good Job! That's a made in US unit? Too many screws. I was working with a lot jeep Cherokees in the past. I haven't seen so many screws on any other car. Very good quality cars though!
Turns out the problem with being, doing, or saying anything on the internets is that some idiot will show up and shoot his mouth off. That idiot was me this time and I apologize to you, sir. I have not ever seen a hundred bad carrier heat exchangers, only about twelve. I have only replaced one of them myself. I came upon this video while looking up a 48ljd008510 from 1993 that does have a pressure sensor and not the hall effect sensor yesterday. Old Yorks do something stupid like the hall effect with the inducer motor mounted centrifugal switch. You and I both know that a great number of Techs are dishonest and do everything possible to scam money. That I have seen that over a hundred times doing HVAC work. I am 65 and can hardly climb the ladders or navigate the joices in attics anymore. I am getting crotchety and the nightly beers do not improve my mood. Sorry.
Very interesting hole there gentlemen. I have seen about one hundred carrier bad heat exchangers in my time on the roofs. Of all the bad Carrier heat exchangers this one is the very first one that looks exactly like a torch burn hole. I must guess that somehow the hot flame from the gas concentrated just there and burnt a 2750 hundred degrees hole in the steel. Must be kinda like a magnifying heat lens in the tube left over from the factory or something. My real guess is that there was not a lot of work that month and you guys needed some more hours. Using high temp silicone is kinda a good idea to seal up the air leaks by the way. Also adjusting the pulley is not how to adjust a loose belt. If you are going to scam somebody for your 18 bucks an hour it might not be a good idea to show the video on the internets.
hellbirdman Yup you got us. We have guys burning holes in heat exchangers so we can add more to our work load. It had nothing to do with the 10 pounds of rust that came out of the heat exchanger. Also it wasn't a loose belt it was a worn pulley. The pulley is worn to a U shape so instead of letting the belt ride nice over it, it pinches and throws it which will eventually cause it to fall off. Adjusting it allows it to ride on an unworn section to prevent that so I can get the unit running while I get a new pulley and replace it. Which in this case happened to be the next day.
Sachi WI It does from a building standpoint. If/when the unit needs to be replaced just rip it off and pop a new one in place. The biggest mistake I see people do that costs a lot of money is keep the little fan tab on the thermostat in the "ON" position during the winter. That leaves the blower on all the time so the air gets sucked into the unit cooled and blown back down. It should be set to "AUTO" so that the blower turns on only when the unit is calling for heat or cooling. Sometimes people use the units as air intakes for the building and in that case your pretty much SOL
Missed a couple screws behind the inducer! Probably not a big deal, but helps seal the passages between the primary and secondary.
you guys doing very great job, professional and mature team work , your vide make me feel that HVAC still has professional mechanics, cheers
I like your HVAC videos as well as the machine tool ones. The first videos of yours I saw was the "silent" air compressor you made. Keep both kinds coming! Very good content always!
I have a Carrier 7A, almost identical in layout and design, that I needed to replace. Thanks for the great video, good straightforward information that gave me the extra confidence in doing it myself. I got lucky in finding parts that I got in a week instead of most suppliers quoting two month backorders right when winter is just beginning. Thanks Again!
Nice video, professionals, but someday dumb ass engineers will figure out evaporator coils installed before heat exchangers are rusting them out! Residential figured that out decades ago
Put some soap on that belt, that helps quite squeak
Enjoyed watching a very professional replacement of a heat exchanger. Good job well done. Halligan you and Jim Pettinato are two great Italian repair men I have learned a great deal from. Thanks
Very old school guys. The way you help each other and present yourself is straight out of the 1950’s. True blue collars.
thanks very much for this video. I'm about to change one of these right now. and never done it. i was worried i was gonna have to take the whole top off and blower assembly. nice work guys
Great job Mr Halligan, I really enjoy your videos very informational and professional. Wish I knew half of what you know, lol.
Nice to see you have a good helper.....instead of standing there watching you... been there
nicely done, I work in South Florida so hardly any gas heaters in our units. but I do service some boilers (mostly domestic hot water) and I love it!
One of the most asked questions I got from owners was, "How big does the hole have to get before it becomes a problem?" My reply was "When more than 4 customers croak in a 30 day period."
I never did figure out why a fixed pot metal pulley would last 30 years and an adjustable cast iron pulley would dish out within a few.
Keep'em warm, Greg.
I've noticed that the adjustable ones don't last as long as a fixed pulley. Also I don't know what it is with Grainger, but they don't seem to stock Browning pulleys anymore. The replacement ones I get are big and chunky and heavy. They don't have those reccesses and webs in the face. We installed 3 new Bryant units and the pulleys on the blower are plastic. We'll see how that turns out.
My theory is the engineers were being cheap bastards. No way a single A belt can handle the 2 hp motors and fans. Whenever it was time to change a pulley on any of them, York, Lennox, Carrier, I'd sell the customer the up sizing to a B belt conversion. The motor pulleys AND belts last way longer.
Very good videos all very helpful to show that this is no child’s play!
Thank you so much for the video. I was able to repair our shop heater. I really appreciate your help. Thanks.
Good to see a team that doesn't have to talk a job done. My best friend and I were such a team for 25 yrs.
Alignment and tensioning tools rock for taking guesswork out.
“ This thing is gonna smoke like a bastard “ haha thats so true and funny at the same time!
Good job guys
Really enjoyed this Greg, Thanks. Interesting that it took almost as much time to adjust the belt tension as it did to R&R the exchanger, plus more cookie strain. Never could understand why they don't put a jack screw on motor mounts to adjust them, for a couple of returns on the SM and a screw an nut, seems you'd get much finer adjustments and quicker. Thanks Again!
There is one, but the way they designed it the screw and nut are so close to the housing that you can only get like a 1/4 turn on it with the wrench so I don't use it. Thee best design on the belt tension I've seen so far is Trane. The smaller units have the motor plate secured with 2 small screws. Take out the screws and there is a large stud attatched to a cogged wheel. Loosen a locking not and turn the stud and the whole plate moves. The larger units have the same idea, but the cogged stud moves a third idler pulley that adjusts tension.
You guys don't have a video of where all the gaskets go on the actual heat exchanger??? I would of liked to see how it was done any links or other videos any where u guys know if where I can see
Missed a bead of high temp on exchanger to front mount. I would have replaced draft motor , wheel and housing.
For training purposes I think you guys should show checking inlet press, manifold press and temperature rise. Polishes off a good repair. Otherwise great video guys.
Nice job there Sir. They called the right tech fellas
I always had to do my heat exchanger replacements by myself, I need a job where these guys work.
Awesome stuff...one thing I saw was you trying to take the union off with the channel locks and you went the wrong way haha common mistake.. Thanks so much for the video though cause my boss was 100% going to tell the customer he doesn't feel comfortable and going to give them a price on a new rooftop... We changed one like 7 years ago when I just got into the trade and it was a mess ... It was a York and took a lonnnnng time.... We're def going to change the heat exchanger now because the unit is 13 years old and in good shape...we just put a condenser fan motor in last summer... I'm in Boston Massachusetts so maybe I'll see you around... Good stuff
Hello What is model # of the unit. and what is part # for the heat exchange?
The old black tape band-aid makes its appearance at 11:22.
Field dressing :-) Those heat exchanger corners are sharp!
That access door to the end of the heat exchanger, mans best friend, if -30 or -40 c, if another functioning unit near by, lol, I pull them off all the time to warm up👍
mychoclabwinston Yup though it's usually not my body that gets cold it's my hands. Especially when I have to take my gloves off to feel things. I warm my hands on the draft motor exhaust. Just make sure you don't put them too close.
A job well done Bud. Im telling you man I really like Carrier units. I totally hate York and Luxaire Heat exchanger job it takes me about a days work to complete. Great video
I hate carriers electrical. All smushed into that stupid box. My fat fingers have a fun time trying to change contactors.
LOL, caught myself saying "Bless You" when you sneezed. Don't know how old this unit is but, if in parts warranty perhaps the load Vs btuh output is off causing short cycling.
took a few years to figure out why the Carrier HX's rust out so bad. The heat exchanger is down stream from the evap coil. When the AC is cranking on a nice hot, humid day in the summer, that heat exchanger is sweating profusely, inside and out. At least Carrier made em easy to change, cuz they don't last long in when summers are hot and humid.
That wasn't too bad at all Greg. Quite serviceable really. You need to come on over to the RV world for cramped quarters!! LOL
Colin ;-)
Oh I haven't done a video of me curled up inside a unit on a cook-line yet :-)
Ahh, the fun times. I hated doing restaurants. There is less grit and grease/oil in the machine shop than most kitchens...LOL
Worst I hate is chip fryers and servicing the burners (had a bit in one video).
Looked like a Daytona 500 tire change, you guys have done that before. good video.
once or twice :-)
Oh, and wè usually leave the HTEx enclosure side panel off to burn it off. Local fire departments can never take a joke.
We use that front one because it fits the air discharge hole perfectly and I want to get that sucker as hot as possible. Pull off the red wire to the thermostat, jump it out, and let the fan turn on using the sensor. That way it gets hotter than it usually would and I don't get the customer calling back with the "I smell something burning" service call.
Nice work getting them heating again!
Why aren't the flames on this unit totally blue?
How was the combustion analysis? Those flames looked real orange…..
Honestly I can't remember. We check gas pressure after we burn off and combustion if needed after that. The camera highlights any orange flame in the dull blue and any wind will also effect the color of flame.
Combustion anylist😂no roll out good to go 😂
You increased the fan speed to make the belt fit better on the pulley,but you never amped it see if it was ok and the bearing has even more tension now. I hope you went back to correct that with a new pulley and bearings.
Pretty Interesting video , once you get the junk out of the way the job goes real smooth .
I got to ask what electrical supplier you use . Having trouble finding capacitors and hi lo
switches for my lathe motor . Sounds like your on the north shore . I'm on the south shore .
Have you tried Turner steel ? Not sure what their stock is .
Steve
For a straight electrical supply we usually use Northeast Electrical. Capacitors I usually get at United Refrigeration. On the south shore there is one in Taunton. For the switches you can also try Grainger, but they tend to be expensive. I've not been to Turner, but I see their trucks on the highway all the time.
Don't get me wrong here though, Carrier makes 16-year shit and if you have only waited a few years you would have an ethical hole. Also note, with the pressure switch a true hole would make the gas not come on. That is a safety built into the inducer- pressure switch combination. It is a fail safe built into the units. You are not saving anyone by burning a hole with the torch.
Everyone would have lived if you waited for the rust to kill it.
hellbirdman
These as with most carrier rooftops have no pressure switch for air proofing of the draft motor. They only have hall effect sensors to sense draft motor rotation. As long as that motor spins the unit will fire. The only safety is a temp sensor roll out switch mounted above the burner rack.
Good job guys.
Yea, it's all the screws. Replace an older York HTEx. More friggin screws then a cat house. Replace ANY with snow on the roof and you find half the screws (and some tools too!) when the snow finally melts. Oh the fun............
Been there.
Did the heat exchanger come with new screws or u just put news one on there ??
Ariel Hernandez never comes with new screws... Only unit does
Gotter dunn. Thanks for sharing.
No glasses at my company in Ct gets you two days off.which is kind of cool then I catch up on side work:)
Nice PROFESSIONAL job Thanks for the Video
I did notice that the site is right next to one of your favorite places - Dunkin Donuts!
I noticed you fellas left the old fan belt in the machine is this common practice? - my
thought here is that if there was a problem with the new one then the old one could
be used in a pinch
We like to leave an old one in there that isn't broken as a bit of an emergency belt. For those days when you get the 5 o' clock service call on a friday and you don't have a belt that will fit at least you can get them back running.
En tiempo real. Gracias!
Greg,
Shit! You damn near have to take the thing apart to install just the heat exchanger! Like I said before, somewhere a design engineer is laughing his ass off! Thanks for the video!
Have a good one!
Dave
Lots of screws :-)
you left the green wire cut?
The other guy caught it. It's just a secondary ground for the ignitor. It's already grounded to the burner rack.
That was fast! Good Job! That's a made in US unit? Too many screws. I was working with a lot jeep Cherokees in the past. I haven't seen so many screws on any other car. Very good quality cars though!
Well it's a US unit, but where it's actually made i have no idea. This is why it pays to have cordless drills and drivers.
We used to take the belts off and cook them out.
omg how could you not remove the flux capacitor first geez
Any one lost an old fan belt? Check inside the box...
Great job thanks 4 the video
great job
I will take a carrier heat exchanger replacement over a trane or York anyday
wow what a job!!!
Nice job Sir, they called the right tech guys. Now, how much would you charge to come here and change mine LOL
Excellent!
Turns out the problem with being, doing, or saying anything on the internets is that some idiot will show up and shoot his mouth off.
That idiot was me this time and I apologize to you, sir.
I have not ever seen a hundred bad carrier heat exchangers, only about twelve.
I have only replaced one of them myself.
I came upon this video while looking up a 48ljd008510 from 1993 that does have a pressure sensor and not the hall effect sensor yesterday.
Old Yorks do something stupid like the hall effect with the inducer motor mounted centrifugal switch.
You and I both know that a great number of Techs are dishonest and do everything possible to scam money.
That I have seen that over a hundred times doing HVAC work.
I am 65 and can hardly climb the ladders or navigate the joices in attics anymore.
I am getting crotchety and the nightly beers do not improve my mood.
Sorry.
Ha! You know you're one of the few people in the history of TH-cam comments that would take back what they say. For that sir I applaud you!
Impressive!
very nice
Very interesting hole there gentlemen. I have seen about one hundred carrier bad heat exchangers in my time on the roofs. Of all the bad Carrier heat exchangers this one is the very first one that looks exactly like a torch burn hole. I must guess that somehow the hot flame from the gas concentrated just there and burnt a 2750 hundred degrees hole in the steel. Must be kinda like a magnifying heat lens in the tube left over from the factory or something. My real guess is that there was not a lot of work that month and you guys needed some more hours.
Using high temp silicone is kinda a good idea to seal up the air leaks by the way.
Also adjusting the pulley is not how to adjust a loose belt.
If you are going to scam somebody for your 18 bucks an hour it might not be a good idea to show the video on the internets.
hellbirdman
Yup you got us. We have guys burning holes in heat exchangers so we can add more to our work load. It had nothing to do with the 10 pounds of rust that came out of the heat exchanger. Also it wasn't a loose belt it was a worn pulley. The pulley is worn to a U shape so instead of letting the belt ride nice over it, it pinches and throws it which will eventually cause it to fall off. Adjusting it allows it to ride on an unworn section to prevent that so I can get the unit running while I get a new pulley and replace it. Which in this case happened to be the next day.
nice video wish you explain the steps
At least it was nice out!
64 degrees. Last of the nice days.
沒人帶沒人帶的小學徒看影片學習 感謝寶貴經驗
The old ni-cad dewalt lol
Hey as much as I hate Dewalt the thing is still kicking and he beats the crap out of it.
That's my Job in Scotland,
It's no wonder rooftop units are NOT energy efficient - you basically have a heat exchanger outside in the frigid temps - makes no sense
Sachi WI It does from a building standpoint. If/when the unit needs to be replaced just rip it off and pop a new one in place. The biggest mistake I see people do that costs a lot of money is keep the little fan tab on the thermostat in the "ON" position during the winter. That leaves the blower on all the time so the air gets sucked into the unit cooled and blown back down. It should be set to "AUTO" so that the blower turns on only when the unit is calling for heat or cooling. Sometimes people use the units as air intakes for the building and in that case your pretty much SOL
BAWSTIN SAWCASWM
What’s the point of posting this