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Lennox Gas Furnace - Cracked Heat Exchanger
WEBVTT Kind: captions Language: en
00:00:00.000 all right hi my name is Steve Holland 00:00:02.21000:00:02.220 I'm with rapid tech I'm a trainer here 00:00:03.71000:00:03.720 and in this video we're gonna go over 00:00:05.80900:00:05.819 the Lennox g20 this is their curved heat 00:00:09.86000:00:09.870 exchanger most of their heat exchangers 00:00:11.72000:00:11.730 going back to like the 1960s and 70s 00:00:14.03000:00:14.040 were what they had at one time called 00:00:15.62000:00:15.630 that the dura curve and there was a G 00:00:18.08000:00:18.090 series this is their whisper heat 00:00:21.32000:00:21.330 furnace also just so you know looks this 00:00:25.25000:00:25.260 course is offered through rap attack and 00:00:27.82000:00:27.830 you can see here's the rapid tech screen 00:00:31.49000:00:31.500 what it looks like when you log in if 00:00:34.49000:00:34.500 you'd like to join rap attack you'll 00:00:36.04900:00:36.059 have to contact us we'll get your screen 00:00:37.52000:00:37.530 name login rap attack is a national 00:00:40.28000:00:40.290 certification program for HVAC 00:00:42.47000:00:42.480 technicians or for those of you thinking 00:00:44.20900:00:44.219 about entering HVAC get your rapidtext 00:00:47.11900:00:47.129 certification when you go for those 00:00:48.50000:00:48.510 interviews you're going to look much 00:00:49.52000:00:49.530 better than the guy that comes in right 00:00:50.72000:00:50.730 after you of course ID here is Lennox 00:00:53.38900:00:53.399 it's the Lennox g20 let's go ahead and 00:00:56.60000:00:56.610 take a look alright here's the video 00:00:59.90000:00:59.910 this is the one I film the other day 00:01:01.84900:01:01.859 let's go ahead and take a look at this 00:01:03.08000:01:03.090 video and short little video and then 00:01:05.71900:01:05.729 we'll go on possible causes on why this 00:01:07.46000:01:07.470 particular fails every single time I'm 00:01:51.56000:01:51.570 going to show you where they fail all 00:01:53.27000:01:53.280 right what we call mu deficient so even 00:02:01.31000:02:01.320 though your primary heat exchanger is 00:02:03.35000:02:03.360 under summer and somewhat of a negative 00:02:04.91000:02:04.920 pressure it's under Atmos negative 00:02:06.77000:02:06.780 atmospheric pressure based on the draft 00:02:09.19900:02:09.209 in the chimney unlike a efficient 00:02:12.55900:02:12.569 furnace 00:02:13.69000:02:13.700 it uses a vent mortar what's drawing the 00:02:17.27000:02:17.280 air through that's under it pretty heavy 00:02:18.53000:02:18.540 negative pressure but I'll show you 00:02:19.94000:02:19.950 where to find this heat exchanger 00:02:21.02000:02:21.030 failure what you see right there my 00:02:58.97000:02:58.980 camera got caught up on the insulation 00:03:00.47000:03:00.480 sorry about that technical difficulty 00:03:08.84000:03:08.850 there but you'll get this you 00:03:21.37000:03:21.380 there's a fracture alright you can see 00:03:25.19000:03:25.200 it tricky one but sometimes you cannot 00:03:31.54000:03:31.550 you can see it from the front here if 00:03:35.60000:03:35.610 you take off on the older model who used 00:03:40.40000:03:40.410 to do is we take they didn't have this 00:03:42.37000:03:42.380 you can have that you had basically some 00:03:48.05000:03:48.060 burners that came out these ribbon 00:03:50.24000:03:50.250 burners with some elephant you can look 00:03:51.71000:03:51.720 up inside there but here's what I'll 00:03:53.75000:03:53.760 tell you about this particular laughter 00:03:55.40000:03:55.410 Havel apps that have that curve each 00:03:57.38000:03:57.390 ginger in the back of the you cedar in 00:04:01.37000:04:01.380 the front wherever it turns it comes 00:04:03.02000:04:03.030 down and it curves like this it's got 00:04:04.79000:04:04.800 that they call it a dirt curve wherever 00:04:08.36000:04:08.370 you see that is where you'll find 00:04:09.77000:04:09.780 failure and on the back of the furnace 00:04:12.88000:04:12.890 it's going to be right in this neck of 00:04:16.49000:04:16.500 the woods all right and maybe I'll show 00:04:19.81900:04:19.829 you that that opening and show you you 00:04:24.17000:04:24.180 guys must really cut them open in the 00:04:25.46000:04:25.470 field don't be cutting them open in the 00:04:27.05000:04:27.060 field all right there you have it Wow 00:04:32.44000:04:32.450 alright so yeah we had a little problem 00:04:34.49000:04:34.500 with the insulation on that one but the 00:04:36.80000:04:36.810 next slide I'm going to show you or the 00:04:39.56000:04:39.570 next part of this video I've got some 00:04:40.79000:04:40.800 really good pictures that I've taken 00:04:41.69000:04:41.700 over the years I started doing this you 00:04:45.08000:04:45.090 know 27 years ago as an HVAC technician 00:04:47.33000:04:47.340 I still I am but one of the things that 00:04:50.02900:04:50.039 then I started doing as I started 00:04:52.01000:04:52.020 archiving heat exchangers if you go um 00:04:55.34000:04:55.350 if you go visit our heat exchangers 00:04:57.29000:04:57.300 safety its heat exchanger safety comm if 00:05:00.29000:05:00.300 you visit that site you'll see a bunch 00:05:01.73000:05:01.740 of the stuff I've archived I literally 00:05:03.02000:05:03.030 have thousands of pictures of heat 00:05:04.79000:05:04.800 exchangers furnace failures a lot of 00:05:07.64000:05:07.650 that stuff is available on that site 00:05:09.40000:05:09.410 which you can use by the way for your 00:05:11.54000:05:11.550 service tech and you want to show a 00:05:13.13000:05:13.140 customer a third-party site it's all 00:05:15.71000:05:15.720 there I've got a homeowner section where 00:05:17.69000:05:17.700 they can learn about why their furnace 00:05:18.92000:05:18.930 is failing great resource to help 00:05:21.56000:05:21.570 technicians I've had technicians from 00:05:23.06000:05:23.070 all over the United States send me 00:05:24.46900:05:24.479 emails saying hey I you know I just 00:05:26.63000:05:26.640 closed the deal 00:05:28.04000:05:28.050 sold sold the customer a new furnace 00:05:29.83900:05:29.849 because I showed him your site and I was 00:05:32.06000:05:32.070 able to identify the 00:05:33.01000:05:33.020 problem I've had other technicians say I 00:05:35.26000:05:35.270 never knew that about that kind of 00:05:36.64000:05:36.650 furnace so that's free there's no charge 00:05:38.92000:05:38.930 for that if you want your rapidtext 00:05:40.93000:05:40.940 certification don't obviously have to 00:05:42.76000:05:42.770 pay for that building all this stuff and 00:05:45.24900:05:45.259 filming this and our LMS that we have is 00:05:47.83000:05:47.840 phenomenal the learning system that we 00:05:50.43900:05:50.449 have that's online so it cost money 00:05:52.86900:05:52.879 but just remember with with our course 00:05:55.24000:05:55.250 our heat exchanger of course it is a 00:05:56.98000:05:56.990 nationally recognized course and 00:05:59.18900:05:59.199 something you can take with you wherever 00:06:00.93900:06:00.949 you go alright back to this Lennox 00:06:02.80000:06:02.810 furnace let's talk about why this may 00:06:06.96900:06:06.979 have happened and let me see if I can 00:06:10.30000:06:10.310 find that there's that fracture first of 00:06:20.26000:06:20.270 all poor design I really think Lennox 00:06:22.18000:06:22.190 laid an egg on this one they've made 00:06:23.92000:06:23.930 this furnace for many many years and 00:06:27.08900:06:27.099 I've worked on thousands I mean not 00:06:30.70000:06:30.710 exaggerating 00:06:31.65900:06:31.669 I probably used to do tune ups and 00:06:33.64000:06:33.650 maintenance PT use on these things 00:06:35.02000:06:35.030 probably a few hundred a year and I 00:06:38.14000:06:38.150 found almost you know 95% of them had 00:06:40.51000:06:40.520 these fractures so I do think Lennox I 00:06:44.43900:06:44.449 do think that a little issue with design 00:06:46.60000:06:46.610 here however with all due respect to 00:06:48.96900:06:48.979 Lennox because Lennox is a good company 00:06:50.74000:06:50.750 they built some good products matter of 00:06:52.51000:06:52.520 fact they had a furnace called the 00:06:53.35000:06:53.360 Lennox pulse that was one of the most 00:06:55.83900:06:55.849 reliable furnaces ever built it had some 00:06:57.82000:06:57.830 other issues with that heat exchanger 00:06:59.17000:06:59.180 under positive pressure and it was a 00:07:00.73000:07:00.740 little noisy if it wasn't installed 00:07:02.43900:07:02.449 correctly but they they're a good 00:07:04.33000:07:04.340 company one of the things that happened 00:07:08.62000:07:08.630 back in the 1970s and 80s is a lot of 00:07:10.89900:07:10.909 the contractors were not doing load 00:07:12.24900:07:12.259 calculations so we did find a bunch of 00:07:14.29000:07:14.300 these furnaces that were oversized if 00:07:16.71900:07:16.729 the oversize any furnace you're gonna 00:07:18.24900:07:18.259 lose a chamber or heat exchanger so 00:07:20.96900:07:20.979 possible causes let's just let's just 00:07:23.23000:07:23.240 touch on them real quick poor design is 00:07:25.30000:07:25.310 it possible yes I can't prove it and I'm 00:07:28.89900:07:28.909 not gonna throw a Lennox under the bus 00:07:30.33900:07:30.349 but they know that there was issues with 00:07:33.01000:07:33.020 this particular heat exchanger we could 00:07:35.55900:07:35.569 have airflow problems 00:07:36.73000:07:36.740 static top pressure problems we could 00:07:38.95000:07:38.960 have lack of maintenance issues okay 00:07:41.67000:07:41.680 over fired you know some guys used to 00:07:44.49900:07:44.509 when the weather got cold bitter bitter 00:07:46.45000:07:46.460 cold 00:07:46.91000:07:46.920 northern climates and if they undersized 00:07:49.10000:07:49.110 the furnace or if a furnace was sized 00:07:50.57000:07:50.580 for a negative 10 degree design town 00:07:52.90000:07:52.910 some guys would go in and they would 00:07:54.98000:07:54.990 jack up the gas pressure well that's 00:07:57.50000:07:57.510 fine and dandy if you're under heavy 00:07:59.09000:07:59.100 load conditions and those returned air 00:08:01.55000:08:01.560 temperatures are lower but that's not 00:08:03.95000:08:03.960 good when it's an average mild winter 00:08:05.63000:08:05.640 day and now you're over firing a furnace 00:08:07.22000:08:07.230 by the way I don't recommend you do that 00:08:08.81000:08:08.820 not suggesting that in this video and 00:08:12.71000:08:12.720 then you could also have draft issues 00:08:13.97000:08:13.980 here if you have a poor draft on that 00:08:15.56000:08:15.570 chimney or chimney problems especially 00:08:18.38000:08:18.390 old clay line chimneys or even chimneys 00:08:20.54000:08:20.550 that were brick lined and you didn't 00:08:21.74000:08:21.750 have the right draft you know you could 00:08:23.87000:08:23.880 cause what what happened is that flame 00:08:26.12000:08:26.130 comes off that ribbon burner and all 00:08:27.56000:08:27.570 that heat and if you're not pulling it 00:08:29.51000:08:29.520 through that heat exchanger quick enough 00:08:31.25000:08:31.260 or at the proper negative pressure you 00:08:35.06000:08:35.070 could have overheating and so you know 00:08:37.31000:08:37.320 those are all some of the issues that 00:08:38.71900:08:38.729 could be going on here 00:08:40.16000:08:40.170 let's take a let's take a look at some 00:08:43.49000:08:43.500 of the different Lennox furnaces that 00:08:45.77000:08:45.780 I've archived over the years this is the 00:08:47.72000:08:47.730 g20 and you can see at the back of the 00:08:49.67000:08:49.680 heat exchanger where it failed 00:08:50.96000:08:50.970 here's another g20 totally different 00:08:53.48000:08:53.490 model and here's a g10 you can see right 00:08:57.68000:08:57.690 there to fail the arrows point oh by the 00:09:00.11000:09:00.120 way all these pictures we have a heat 00:09:01.76000:09:01.770 exchanger guide that technicians can 00:09:03.71000:09:03.720 purchase or you can purchase it's a full 00:09:05.96000:09:05.970 guide it's about I don't know half inch 00:09:07.67000:09:07.680 3/4 of an inch thick by 3/4 of an inch 00:09:09.68000:09:09.690 thick 00:09:09.98000:09:09.990 very nice nicely laminated and we've got 00:09:14.45000:09:14.460 most of the popular furnaces in there 00:09:17.03000:09:17.040 all these pictures that's where I got it 00:09:18.29000:09:18.300 from I took it right out of my eat 00:09:19.34000:09:19.350 exchanger guide there's another g20 you 00:09:21.77000:09:21.780 can see the fracture and then here know 00:09:24.44000:09:24.450 one thing I want you to realize if you 00:09:28.85000:09:28.860 pull the burners you can usually see 00:09:30.23000:09:30.240 these at the back this same curve okay 00:09:33.62000:09:33.630 so if we look at this curve right here 00:09:35.18000:09:35.190 that same exact curve is in the front of 00:09:37.58000:09:37.590 the heat exchanger right above the 00:09:40.13000:09:40.140 opening of the runner so right where the 00:09:42.14000:09:42.150 burner compartment is that same exact 00:09:44.42000:09:44.430 curve is in the front they also fail 00:09:47.21000:09:47.220 there and you'll see fractures or cracks 00:09:48.68000:09:48.690 in that same spot so don't just look at 00:09:51.44000:09:51.450 the back of the heat exchanger okay so 00:09:53.45000:09:53.460 right here in the back see this in the 00:09:55.58000:09:55.590 back don't look just there you got to 00:09:57.95000:09:57.960 look in the front way up and here as 00:09:59.78000:09:59.790 well 00:10:00.80000:10:00.810 the only way you're gonna see it is with 00:10:02.03000:10:02.040 a mirror or some sort of inspection 00:10:03.74000:10:03.750 camera we use a very high quality camera 00:10:06.47000:10:06.480 system that's optical zoom 00:10:08.27000:10:08.280 infrared we're not this is not something 00:10:10.88000:10:10.890 you buy at a big-box store these are 00:10:13.13000:10:13.140 specially designed customized cameras so 00:10:16.49000:10:16.500 there you have it that's your Lenox 00:10:18.85000:10:18.860 curved heat exchanger also known as the 00:10:21.68000:10:21.690 director of many years ago but I could 00:10:23.75000:10:23.760 tell you if you work on these or service 00:10:25.67000:10:25.680 these you need to check those curves on 00:10:27.53000:10:27.540 every single one and lastly you can 00:10:31.55000:10:31.560 reach me at echoes skill at gmail.com 00:10:35.11000:10:35.120 ethos skill etho which you know stands 00:10:38.12000:10:38.130 for ethics skill for skills or you could 00:10:40.55000:10:40.560 reach Scott at eight six six nine nine 00:10:42.08000:10:42.090 to 1717 here's a little picture of our 00:10:45.14000:10:45.150 rapid tech login so if you're a member 00:10:47.15000:10:47.160 paying member you'd get your login your 00:10:49.28000:10:49.290 password go in take all your courses and 00:10:52.09000:10:52.100 and that's where you can get your 00:10:54.14000:10:54.150 certification um this is a right here I 00:10:57.26000:10:57.270 you know I've done a bunch of these 00:10:58.61000:10:58.620 videos literally hundreds I've only got 00:11:02.27000:11:02.280 on YouTube a number of them I'm doing 00:11:03.77000:11:03.780 more and more on YouTube all the time 00:11:05.03000:11:05.040 but I keep forgetting to tell you guys 00:11:07.37000:11:07.380 that we have another site called right 00:11:09.05000:11:09.060 here it's called the heat exchanger 00:11:10.22000:11:10.230 expert or heat exchanger safety now 00:11:13.01000:11:13.020 realize it's heat exchanger expert 00:11:14.81000:11:14.820 without the S the letter S is not me 00:11:17.72000:11:17.730 that's another guy I know by the way 00:11:19.46000:11:19.470 he's a great guy 00:11:20.63000:11:20.640 LS phenomenal really smart I mean 00:11:23.66000:11:23.670 exchangers but we're a heat exchanger 00:11:26.69000:11:26.700 expert calm or just type and heat 00:11:29.51000:11:29.520 exchanger safety calm and you will have 00:11:32.03000:11:32.040 access to all of our gallery that's 00:11:33.82900:11:33.839 pictures all of our stories that we find 00:11:37.01000:11:37.020 some videos there's a homeowner's 00:11:40.01000:11:40.020 section in there and that's a great 00:11:41.39000:11:41.400 resource to use with your customers so 00:11:43.22000:11:43.230 there you have it there's another video 00:11:45.44000:11:45.450 on Lennox furnace if you visit our our 00:11:50.24000:11:50.250 channel you'll see live train on there 00:11:52.10000:11:52.110 Goodman on there we're uploading 00:11:54.38000:11:54.390 literally dozens of these things I'm 00:11:56.45000:11:56.460 guessing by the end of the year we may 00:11:57.71000:11:57.720 have anywhere from you know one hundred 00:11:59.54000:11:59.550 and fifty to one hundred more of these 00:12:01.31000:12:01.320 videos out there but again if you want 00:12:03.62000:12:03.630 your rapidtext certification you'll have 00:12:05.81000:12:05.820 to join rapid tech all right thank you 00:12:07.91000:12:07.920 and I hope you enjoyed this video and 00:12:09.50000:12:09.510 look forward to doing some
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