00:00:07.460 my name is ben gromicko 00:00:09.35000:00:09.360 and this is a gas-fired heating system 00:00:11.78000:00:11.790 i've been told it has a cracked heat 00:00:13.85000:00:13.860 exchanger inside home inspectors perform 00:00:16.64000:00:16.650 visual only inspections so we never 00:00:18.68000:00:18.690 really get the chance to tear things 00:00:20.66000:00:20.670 apart and see what's inside 00:00:21.85900:00:21.869 until now I've got my tools we've got 00:00:25.55000:00:25.560 the heater let's have some fun so we 00:00:39.61900:00:39.629 have the gas valve here mechanism 00:00:42.29000:00:42.300 there's no pilot light 00:00:44.15000:00:44.160 it's an intermittent pilot so that gives 00:00:46.91000:00:46.920 us the efficiency there isn't a standing 00:00:48.70900:00:48.719 flame all the time there's no button to 00:00:51.26000:00:51.270 push down it's simply an on and off 00:00:53.20000:00:53.210 switch here and there's where the gas 00:00:55.97000:00:55.980 comes through and it goes through these 00:00:59.15000:00:59.160 little ports here and it allows air and 00:01:02.47000:01:02.480 gas to shoot through these burner ports 00:01:05.57000:01:05.580 through here and here's gas supplied 00:01:10.88000:01:10.890 from the main valve to the pilot light 00:01:13.70000:01:13.710 right there and it's on the middle 00:01:18.02000:01:18.030 burner so there's the intermittent pilot 00:01:22.28000:01:22.290 light and sensor let's just keep pulling 00:01:27.14000:01:27.150 these components out the burners simply 00:01:31.21900:01:31.229 slide right out and here's where the the 00:01:37.67000:01:37.680 crossover is the bridge so the flames 00:01:40.52000:01:40.530 shoot in ignite and then the flames 00:01:43.21900:01:43.229 crossover from one burner to the next 00:01:45.99900:01:46.009 and I'll get my flashlight to see what's 00:01:49.42900:01:49.439 inside 00:01:51.53000:01:51.540 you 00:02:11.28000:02:11.290 so there is a plate on the top where the 00:02:14.98000:02:14.990 exhaust gasses are pulled through the 00:02:18.61000:02:18.620 combustion air pulls it's pulled through 00:02:21.37000:02:21.380 the heat exchanger and is exhausted 00:02:23.32000:02:23.330 outwards and goes to this plate and you 00:02:25.78000:02:25.790 can see some zinc oxide the white stuff 00:02:28.66000:02:28.670 and it's restricted because we want to 00:02:32.02000:02:32.030 control the heat exhaust gases inside 00:02:34.42000:02:34.430 the heat exchanger as long as possible 00:02:36.34000:02:36.350 and very little air is being pushed out 00:02:39.43000:02:39.440 through this little restrictor plate and 00:02:41.26000:02:41.270 it's this hole was according to the BTUs 00:02:44.05000:02:44.060 and the design of the heating system 00:03:03.66000:03:03.670 take off that front cover there's a 00:03:06.40000:03:06.410 draft inducer fan pulling combustion air 00:03:09.82000:03:09.830 through the heat exchanger it 00:03:11.22000:03:11.230 serpentines up through and we could take 00:03:16.63000:03:16.640 this off here but I can see the the 00:03:19.06000:03:19.070 blades of the fan there spinning through 00:03:21.97000:03:21.980 there and there's an arrow showing the 00:03:27.67000:03:27.680 exhaust direction so you know that it's 00:03:29.92000:03:29.930 not a forced it is a forced draft 00:03:33.94000:03:33.950 it's an induced draft so it's inducing a 00:03:36.25000:03:36.260 draft it's pulling combustion air down 00:03:38.11000:03:38.120 here through the heat exchanger and up 00:03:39.97000:03:39.980 it out and this is the draft draft 00:03:45.52000:03:45.530 inducer fan we've got some like 00:03:47.68000:03:47.690 insulation material for a nice airtight 00:03:50.44000:03:50.450 seal and there's the fan here so this 00:03:54.16000:03:54.170 spins and it pulls combustion air from 00:03:57.61000:03:57.620 this area here exhaust gasses oh and 00:04:02.68000:04:02.690 it's hooked up to these sensors so we 00:04:06.64000:04:06.650 have these sensors here and these tubes 00:04:08.19900:04:08.209 there's air tube so it's pressure 00:04:10.10000:04:10.110 it's sensing pressure I really can't 00:04:14.21000:04:14.220 tell where these go there are no holes 00:04:15.98000:04:15.990 here but these are this is our little 00:04:18.94900:04:18.959 pressure gauge and if there's no no um 00:04:22.91000:04:22.920 it's it's sensing a negative air 00:04:25.82000:04:25.830 pressure inside this fan because it's 00:04:28.76000:04:28.770 sucking air and there's the exhaust 00:04:33.05000:04:33.060 gases that come up through the heat 00:04:34.46000:04:34.470 exchanger so we're getting closer to the 00:04:36.59000:04:36.600 heat exchanger needs a little persuading 00:04:43.27000:04:43.280 alright so this is some kind of front to 00:04:54.17000:04:54.180 the heat exchanger where the exhaust 00:04:55.55000:04:55.560 gases are coming up from the three 00:04:57.98000:04:57.990 chambers and it's centralizing it and 00:05:01.43000:05:01.440 this is where the draft inducer fan was 00:05:03.08000:05:03.090 attached so it's pulling all three so 00:05:07.16000:05:07.170 there's the heat exchanger there and 00:05:09.89000:05:09.900 I'll get my flashlight and take a look 00:05:11.66000:05:11.670 in before we get there let's see if we 00:05:14.15000:05:14.160 can pull out some of the signs of the 00:05:15.38000:05:15.390 jacket what I'm finding out is that 00:05:18.89000:05:18.900 there are a lot of screws to take out 00:05:22.42000:05:22.430 but we're getting progress so here's 00:05:36.89000:05:36.900 here's another sensor here 00:05:42.20000:05:42.210 so on the side there's another sensor we 00:05:45.39000:05:45.400 have sensing the pressure inside the 00:05:49.20000:05:49.210 heat exchanger or the pressure air 00:05:51.72000:05:51.730 pressure inside the draft inducer fan 00:05:56.90000:05:56.910 and we're getting to the side of the 00:06:00.51000:06:00.520 heat exchanger great let's open this up 00:06:21.44000:06:21.450 well there wasn't any insulation on the 00:06:23.94000:06:23.950 jacket on this side and here's looks 00:06:27.57000:06:27.580 like a heat shield I would say because 00:06:31.17000:06:31.180 there's the heat exchanger so that's 00:06:33.54000:06:33.550 just the heat shield here and it's 00:06:36.93000:06:36.940 riveted so I use some persuasion 00:06:51.92900:06:51.939 here's the heat exchanger here's the 00:06:57.30900:06:57.319 dark mark this is an indication of some 00:07:01.45000:07:01.460 overheating some thermal expansion and 00:07:04.98000:07:04.990 right here is a crack in the heat 00:07:08.49900:07:08.509 exchanger amazing 00:07:14.10000:07:14.110 and it's right here where this um 00:07:17.28000:07:17.290 discolored area is so here's where the 00:07:20.92000:07:20.930 burners are remember the burner ports 00:07:23.87900:07:23.889 they go inside there the flames come up 00:07:29.32000:07:29.330 this has been overheated and it has 00:07:32.59000:07:32.600 deformed the metal and it has cracked 00:07:36.25000:07:36.260 the heat exchanger and it's here it's in 00:07:39.52000:07:39.530 the backside here there is no way you 00:07:42.85000:07:42.860 could visually see this so be careful 00:07:46.36000:07:46.370 what you say about the heat exchanger as 00:07:47.80000:07:47.810 a home inspector there's no way you can 00:07:49.39000:07:49.400 see this without tearing it apart and 00:07:58.11000:07:58.120 here comes the heat exchanger and 00:08:02.85000:08:02.860 there's the other heat shield and here's 00:08:07.12000:08:07.130 some insulation where there isn't a heat 00:08:08.62000:08:08.630 shield this is on the back of the 00:08:09.76000:08:09.770 heating system and can't see this at all 00:08:13.27000:08:13.280 when you're doing inspection the heat 00:08:18.07000:08:18.080 shield there and there's a blower area 00:08:21.27900:08:21.289 here there's a large opening here and 00:08:23.17000:08:23.180 the air comes up through and to the 00:08:25.84000:08:25.850 bottom of it 00:08:31.90000:08:31.910 so here's the top of the heat exchanger 00:08:36.01000:08:36.020 if you can imagine hot air coming from 00:08:39.52900:08:39.539 the blower this is the bottom of the 00:08:41.51000:08:41.520 heat exchanger here and it comes up and 00:08:43.64000:08:43.650 it does a little squiggle there are a 00:08:46.34000:08:46.350 little serpentine there and it gets 00:08:48.68000:08:48.690 heated up and it goes up into the well 00:08:52.04000:08:52.050 if there's an air conditioner coil that 00:08:53.39000:08:53.400 would be their conditional coil here a 00:08:54.56000:08:54.570 hot area and then the main plenum and 00:08:58.69000:08:58.700 here on the back is that crack in the 00:09:01.82000:09:01.830 heat exchanger right there this is the 00:09:08.72000:09:08.730 view from the bottom so the air from the 00:09:11.72000:09:11.730 blower goes up through goes up through 00:09:17.21000:09:17.220 and does little serpentine to slow down 00:09:19.01000:09:19.020 the airflow so it can exchange or 00:09:22.58000:09:22.590 release the heat from the heat exchanger 00:09:24.86000:09:24.870 metal to the air passing through and the 00:09:27.56000:09:27.570 hot exhaust gases are inside the burners 00:09:29.48000:09:29.490 are inside hot exhaust gasses swirl up 00:09:31.73000:09:31.740 and go out through the draft inducer fan 00:09:34.48000:09:34.490 and really can't see any more damage or 00:09:39.17000:09:39.180 cracks although there might be and in 00:09:44.93000:09:44.940 here there's a little sensor that's 00:09:48.50000:09:48.510 sensing probably down here inside the 00:09:51.86000:09:51.870 heat exchanger sensing the heat of the 00:09:54.32000:09:54.330 air so that we know the heat and it's 00:09:58.40000:09:58.410 probably a kill switch it's too hot or 00:10:03.66000:10:03.670 is going on so this is one of the 00:10:05.55000:10:05.560 testers here and if we pull that out 00:10:08.16000:10:08.170 that's stuck inside the airflow of the 00:10:11.49000:10:11.500 of the hot air going through the heat 00:10:13.44000:10:13.450 exchanger so this is this is why it was 00:10:18.18000:10:18.190 pulled out this little crack right here 00:10:19.70000:10:19.710 this failed the whole heat exchanger and 00:10:22.43000:10:22.440 the whole heating system had to be 00:10:24.36000:10:24.370 replaced and this is not visible during 00:10:27.72000:10:27.730 the home inspection that's about it
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