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Simple Furnace Heat Exchanger Test _ HVAC Learning Solutions

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Language: en

00:00:00.000
hi this is Jose teleport here with HDAC
00:00:02.750 00:00:02.760 learning solutions want to talk to you
00:00:04.970 00:00:04.980 today about testing a furnace heat
00:00:06.499 00:00:06.509 exchanger that you think might be
00:00:08.240 00:00:08.250 cracked or damaged now this can be a
00:00:11.000 00:00:11.010 tricky situation for some people to
00:00:12.770 00:00:12.780 inspect some really don't know the
00:00:14.780 00:00:14.790 simplest and easiest ways to test them
00:00:16.609 00:00:16.619 while it's true we can disassemble the
00:00:18.710 00:00:18.720 heat exchanger take the manifold the
00:00:21.140 00:00:21.150 burners out and do a visual inspection
00:00:22.880 00:00:22.890 and though we can come in with expection
00:00:25.460 00:00:25.470 cameras or multiple mirrors and
00:00:29.240 00:00:29.250 flashlights to inspect them there's a
00:00:31.130 00:00:31.140 very simple test that you can perform
00:00:32.749 00:00:32.759 first typically without having to
00:00:35.209 00:00:35.219 disassemble anything and that's the
00:00:37.280 00:00:37.290 static pressure test what that means is
00:00:40.369 00:00:40.379 that we turn the furnaces fan on but
00:00:42.650 00:00:42.660 leave the heating system off that will
00:00:44.930 00:00:44.940 engage the blower motor right below the
00:00:46.729 00:00:46.739 burners and that will start pushing
00:00:48.500 00:00:48.510 positively pressurized air across the
00:00:50.569 00:00:50.579 heat exchanger if any of the heat
00:00:53.029 00:00:53.039 exchanger cells are breached or cracked
00:00:55.939 00:00:55.949 the air from the blower will enter one
00:00:58.580 00:00:58.590 of these cells and we can simply do a
00:01:01.310 00:01:01.320 standing match test to see if the flame
00:01:04.250 00:01:04.260 is blown around extinguished or
00:01:06.620 00:01:06.630 distorted in any way when we test the
00:01:09.410 00:01:09.420 heat exchanger that doesn't have a crack
00:01:11.149 00:01:11.159 there should be no visual sign of the
00:01:13.340 00:01:13.350 flame moving pretty much at all so let's
00:01:16.880 00:01:16.890 go ahead and inspect this furnace
00:01:18.260 00:01:18.270 starting from this end and we'll work
00:01:20.870 00:01:20.880 our way across see if we can visually
00:01:23.240 00:01:23.250 see what happens when a heat exchanger
00:01:25.520 00:01:25.530 is cracked using the static pressure
00:01:27.109 00:01:27.119 test
00:01:28.710 00:01:28.720 so we'll light a match on the
00:01:30.180 00:01:30.190 telescoping wand we'll go to the first
00:01:33.720 00:01:33.730 heat exchanger cell you notice when I
00:01:36.510 00:01:36.520 put the flame in the match stays about
00:01:38.580 00:01:38.590 the same it's consistent there's no real
00:01:40.410 00:01:40.420 moving I go to the second one and again
00:01:44.240 00:01:44.250 there's no distortion of the flame now
00:01:47.910 00:01:47.920 let's go to the next one we can see as
00:01:50.550 00:01:50.560 we get close the flames already dancing
00:01:52.380 00:01:52.390 by the time we get inside the cell it's
00:01:54.840 00:01:54.850 completely extinguished I think we just
00:01:58.020 00:01:58.030 found our damage to eat exchange
00:01:59.640 00:01:59.650 yourself now we can go ahead and utilize
00:02:02.580 00:02:02.590 one of our other test methods like an
00:02:04.920 00:02:04.930 inspection camera inspection mirror or
00:02:07.710 00:02:07.720 disassembling the furnace and looking at
00:02:09.480 00:02:09.490 the heat exchanger itself to verify it
00:02:11.760 00:02:11.770 but this quick and easy test will allow
00:02:14.910 00:02:14.920 you to see if you have a damaged or
00:02:16.890 00:02:16.900 breach eat exchanger in a very short
00:02:19.080 00:02:19.090 period of time thank you

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