Common Myths regarding Furnace Heat Exchangers

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Language: en

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hi this is Steve Holland with Holland's
00:00:02.810 00:00:02.820 home services and heat-exchanger safety
00:00:05.090 00:00:05.100 dot-com this episode we're going to talk
00:00:07.070 00:00:07.080 about heat exchanger safety and carbon
00:00:08.690 00:00:08.700 monoxide and some of the common myths
00:00:10.520 00:00:10.530 associated with heat exchangers and heat
00:00:12.200 00:00:12.210 exchanger safety
00:00:47.790 00:00:47.800 now let's talk about one of the common
00:00:50.040 00:00:50.050 myths with heat exchangers many service
00:00:52.890 00:00:52.900 technicians today believe that the only
00:00:55.140 00:00:55.150 time a heat exchanger has failed is when
00:00:57.000 00:00:57.010 they find a crack that's a myth
00:00:58.920 00:00:58.930 I'm going to share with you some heat
00:01:00.000 00:01:00.010 exchangers that I found throughout the
00:01:01.560 00:01:01.570 years from our service technicians that
00:01:03.780 00:01:03.790 are out there inspecting these things
00:01:04.950 00:01:04.960 and share with you the different types
00:01:06.450 00:01:06.460 of problems with heat exchangers the
00:01:08.490 00:01:08.500 cracked heat exchanger is one that is
00:01:10.469 00:01:10.479 very very common and this is a furnace
00:01:12.960 00:01:12.970 that was actually only this one was
00:01:15.090 00:01:15.100 installed was two and a half years old
00:01:17.130 00:01:17.140 and we found the failure in 2011 and as
00:01:21.090 00:01:21.100 you can see and I should have a sharpie
00:01:23.130 00:01:23.140 here I can actually point it out there
00:01:25.950 00:01:25.960 is a very small fracture right here on
00:01:29.609 00:01:29.619 this heat exchanger we call this the
00:01:31.020 00:01:31.030 washboard section of the heat exchanger
00:01:32.820 00:01:32.830 and that failure is right there that's a
00:01:35.520 00:01:35.530 temperature stress point so we can see
00:01:38.160 00:01:38.170 that that one has failed that is a crack
00:01:39.780 00:01:39.790 team exchanger another type of heat
00:01:42.270 00:01:42.280 exchanger failure is a bulge as you can
00:01:45.450 00:01:45.460 see this is from a mobile home and as
00:01:47.580 00:01:47.590 you can see right here there's a very
00:01:49.740 00:01:49.750 large bulge
00:01:50.880 00:01:50.890 that's another temperature problem and
00:01:52.680 00:01:52.690 that was a that was a manufacturer's
00:01:54.630 00:01:54.640 defect unfortunately but it's they did
00:01:57.029 00:01:57.039 take care of it it is taken care of now
00:01:58.590 00:01:58.600 but that ball jet metal is ready to
00:02:00.600 00:02:00.610 rupture at any point then we have
00:02:03.510 00:02:03.520 another common problem with heat
00:02:04.859 00:02:04.869 exchangers let's suppose you go in your
00:02:07.380 00:02:07.390 diagnosis system or you're going to be
00:02:08.999 00:02:09.009 on it you're going to go on a tune-up
00:02:10.020 00:02:10.030 and you're going to check over the
00:02:11.040 00:02:11.050 furnace and you find no cracks that does
00:02:13.230 00:02:13.240 not mean that the heat exchanger has not
00:02:14.670 00:02:14.680 failed here's one that a lot of
00:02:17.730 00:02:17.740 technicians miss and it's a plug
00:02:20.070 00:02:20.080 secondary this particular heat exchanger
00:02:22.949 00:02:22.959 the primary heat exchanger on this
00:02:24.449 00:02:24.459 furnace was fine if we would have done a
00:02:26.760 00:02:26.770 test on it and just look for a cracked
00:02:29.610 00:02:29.620 heat exchanger we'd have never found it
00:02:31.110 00:02:31.120 this particular furnace was putting out
00:02:33.059 00:02:33.069 over 2,000 parts per million carbon
00:02:34.620 00:02:34.630 monoxide on the exhaust all because it
00:02:36.870 00:02:36.880 had a plug secondary heat exchanger and
00:02:39.059 00:02:39.069 if you look at it very closely which you
00:02:40.740 00:02:40.750 can't really see but down inside here
00:02:42.600 00:02:42.610 there's actually pitting in holes inside
00:02:45.540 00:02:45.550 here so that's another common problem
00:02:47.940 00:02:47.950 the heat exchanger
00:02:49.830 00:02:49.840 that that would would cause it to cause
00:02:53.130 00:02:53.140 the furnace to fail or become super
00:02:54.690 00:02:54.700 inefficient over here
00:02:57.090 00:02:57.100 we have a heat exchanger that doesn't
00:02:58.530 00:02:58.540 look so bad right all it is is a tubular
00:03:00.930 00:03:00.940 heat
00:03:01.480 00:03:01.490 danger but if you notice the black foot
00:03:03.310 00:03:03.320 this heat exchanger was suited up this
00:03:05.980 00:03:05.990 one as well was putting out about
00:03:07.210 00:03:07.220 fifteen to sixteen hundred parts per
00:03:08.710 00:03:08.720 million carbon monoxide all because a
00:03:10.960 00:03:10.970 restrictor disk was left off on the
00:03:13.000 00:03:13.010 furnace so one simple little part was
00:03:15.280 00:03:15.290 left off caused this furnace to stood up
00:03:17.320 00:03:17.330 and cause high levels of carbon monoxide
00:03:18.810 00:03:18.820 so those are some of the common problems
00:03:20.890 00:03:20.900 with heat exchangers we have plug heat
00:03:22.930 00:03:22.940 exchangers we have cracked heat
00:03:24.700 00:03:24.710 exchangers we have ruptured or bulging
00:03:27.700 00:03:27.710 heat exchangers so did heat exchangers
00:03:30.520 00:03:30.530 those are the most common and I'm Steve
00:03:33.310 00:03:33.320 Holland with Holland home services and
00:03:35.320 00:03:35.330 heat exchanger safety dot-com I hope you
00:03:37.360 00:03:37.370 enjoyed this episode about heat
00:03:38.650 00:03:38.660 exchanger safety for more information
00:03:40.840 00:03:40.850 you're welcome to visit our web site at
00:03:42.370 00:03:42.380 Holland heating com or you can visit us
00:03:44.890 00:03:44.900 at heat exchanger safety dot-com
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