00:00:03.140 trained premix burner style yet 00:00:06.47000:00:06.480 exchanger or barrel style heat exchanger 00:00:08.98000:00:08.990 you guys have all seen these or most of 00:00:11.50900:00:11.519 you have seen these they are I've got a 00:00:16.64000:00:16.650 picture up here that I drew up I know 00:00:21.05000:00:21.060 it's a crude drawing but just to help 00:00:22.79000:00:22.800 everybody understand what we're talking 00:00:24.23000:00:24.240 about so we've got the gas regulator 00:00:26.92900:00:26.939 which is the inline gas regulator and 00:00:30.89000:00:30.900 the pipe we've got the gas valve and the 00:00:34.13000:00:34.140 draft motor which is inside the unit gas 00:00:37.52000:00:37.530 valve and drop motor it's got holes on 00:00:40.58000:00:40.590 the backside of this plate that's where 00:00:41.90000:00:41.910 it draws the air in mixes the air and 00:00:43.85000:00:43.860 the gas in the draft motor and then 00:00:46.11900:00:46.129 injects the air and gas mixture into the 00:00:49.04000:00:49.050 unit that's why they call it a premix 00:00:50.75000:00:50.760 burner style of heat exchanger it 00:00:52.81900:00:52.829 premixes the gas in the air and injects 00:00:55.91000:00:55.920 it into the burner biggest difference on 00:01:00.31900:01:00.329 these units guys is maybe I'll back up a 00:01:03.20000:01:03.210 second here yeah this burner plate is a 00:01:06.64900:01:06.659 screen and there's also a pre screen 00:01:10.78900:01:10.799 right here on the backside of this draft 00:01:12.35000:01:12.360 motor this screen here is designed to 00:01:15.92000:01:15.930 keep the dirt out of the heat exchanger 00:01:17.99000:01:18.000 out of this burner plate screen so when 00:01:21.74000:01:21.750 you're replacing these draft motors are 00:01:23.39000:01:23.400 working on these guys it's really 00:01:24.98000:01:24.990 important to have the screen in there 00:01:26.35900:01:26.369 it's also important to clean that screen 00:01:28.60900:01:28.619 occasionally because that screen will 00:01:30.26000:01:30.270 get dirty and it won't cause lighting 00:01:32.63000:01:32.640 problems and heat reliability problems 00:01:35.35900:01:35.369 on these units so with that said the 00:01:38.39000:01:38.400 other thing I wanted to point out here 00:01:39.64900:01:39.659 is the hot surface igniter 00:01:42.64900:01:42.659 well on a train the hot surface igniter 00:01:45.20000:01:45.210 lights the combustion starts the 00:01:47.66000:01:47.670 combustion process once it has stable 00:01:50.09000:01:50.100 combustion it shuts off the power to 00:01:51.91900:01:51.929 that igniter and then that igniter on a 00:01:55.34000:01:55.350 train also becomes the flame sensor it 00:01:57.44000:01:57.450 performs flame rectification at that 00:01:59.48000:01:59.490 point so flame sensor and igniter all in 00:02:02.92900:02:02.939 one the other big difference you notice 00:02:05.69000:02:05.700 on a train is there is not an airflow 00:02:07.94000:02:07.950 proving switch because Trane does that 00:02:11.27000:02:11.280 with the gas valve this gas valve is a 00:02:13.91000:02:13.920 negative gas valve and what that means 00:02:17.33000:02:17.340 is that this gas valve because at the 00:02:20.36000:02:20.370 draft motor is drawing air and gas out 00:02:22.91000:02:22.920 of the gas valve and injecting that 00:02:24.74000:02:24.750 mixture into the heat exchanger if you 00:02:28.13000:02:28.140 apply 24 volts on one of these gas 00:02:30.53000:02:30.540 valves take one of these out and put it 00:02:32.00000:02:32.010 on the bench at the bench test at one 00:02:33.44000:02:33.450 time if you guys have a new one applied 00:02:35.72000:02:35.730 24 volts to it and if you blow into this 00:02:38.66000:02:38.670 Inlet pipe with the 24 volts applied you 00:02:41.21000:02:41.220 will not be able to blow through one of 00:02:42.68000:02:42.690 these gas valves because it does not 00:02:44.21000:02:44.220 have the negative pressure of the draft 00:02:46.91000:02:46.920 motor creating a suction on the backside 00:02:49.30900:02:49.319 so that's how Trane proves that the 00:02:51.55900:02:51.569 draft motor is running it has to have a 00:02:53.21000:02:53.220 negative pressure here in order for it 00:02:55.97000:02:55.980 to fully open the gas valve on a lot of 00:02:57.97900:02:57.989 the gas to come through so it's a little 00:02:59.53900:02:59.549 bit of a different animal that way but 00:03:01.64000:03:01.650 if you know that it helps you to 00:03:03.53000:03:03.540 understand what's going on here and why 00:03:05.36000:03:05.370 you don't get it too late why you don't 00:03:07.03900:03:07.049 get the smell of gas sometimes 00:03:09.43000:03:09.440 these gas valves also guys do not travel 00:03:12.13000:03:12.140 very well via air freight because when 00:03:14.02000:03:14.030 they put them in a cargo hold of an 00:03:15.64000:03:15.650 airplane their unpressurized at messes 00:03:17.47000:03:17.480 these are pretty sensitive train does 00:03:19.45000:03:19.460 not recommend air freight in those gas 00:03:21.31000:03:21.320 valves across the country so with that 00:03:24.91000:03:24.920 said everyone the best way to work on 00:03:27.73000:03:27.740 these troubleshoot them and get them 00:03:29.68000:03:29.690 dialed in if you dial these in and get 00:03:32.44000:03:32.450 them to run right they will run very 00:03:34.51000:03:34.520 reliably for a very very long time 00:03:36.82000:03:36.830 trouble-free 00:03:37.90000:03:37.910 the key on these is there's a port on 00:03:40.57000:03:40.580 the inlet side of the gas valve and a 00:03:42.43000:03:42.440 port on the outlet side to port on the 00:03:44.71000:03:44.720 inlet side you hooked your manometer up 00:03:46.30000:03:46.310 to and with the unit running with the 00:03:50.20000:03:50.210 heat on Inlet you should have plus eight 00:03:53.35000:03:53.360 to ten inches of water column gas supply 00:03:55.72000:03:55.730 that's Inlet gas pressure into the gas 00:03:58.21000:03:58.220 valve you adjust your gas regulator to 00:04:02.26000:04:02.270 get that eight to ten inches again in 00:04:04.03000:04:04.040 high fire so w1 and w2 outlets gas 00:04:08.77000:04:08.780 pressure out of the gas valve this is 00:04:10.45000:04:10.460 where these get tricky is this is a 00:04:12.19000:04:12.200 negative pressure when it's running heat 00:04:14.97900:04:14.989 again in high fire negative 0.2 inches 00:04:18.69900:04:18.709 of water column to negative 0.36 inches 00:04:21.40000:04:21.410 of water column in this pipe or the 00:04:23.40900:04:23.419 outlet port on the gas valve 00:04:27.04000:04:27.050 very common problem is if you have one 00:04:29.95000:04:29.960 if you have these pressures off this 00:04:32.49900:04:32.509 unit will will squeal sometimes or it 00:04:35.23000:04:35.240 will do the wulfing sound barking like a 00:04:38.62000:04:38.630 dog you guys all have a different term 00:04:40.12000:04:40.130 for it you've heard that little rumbling 00:04:41.35000:04:41.360 sound where they don't like to light 00:04:42.46000:04:42.470 properly a lot of that is related to gas 00:04:44.52900:04:44.539 pressure sometimes if you verify you 00:04:47.89000:04:47.900 have the proper gas pressure it can also 00:04:51.82000:04:51.830 be related to that gasket on that burner 00:04:53.89000:04:53.900 plate right here guys there's a gasket 00:04:55.57000:04:55.580 behind this plate that seals out off 00:04:57.96900:04:57.979 around where all those bolts are if that 00:05:00.12900:05:00.139 gasket has a leak it'll cause it to to 00:05:02.46900:05:02.479 Rumble or a wolf or bark like a dog 00:05:04.57000:05:04.580 the other thing that will cause it is 00:05:06.93900:05:06.949 that gasket around the hot surface 00:05:09.01000:05:09.020 igniter that gaskets gotta be good 00:05:12.15900:05:12.169 these screws break off quite regularly I 00:05:14.64900:05:14.659 use never cease when I reinstall these a 00:05:17.49900:05:17.509 hot surface igniter xan I seize on those 00:05:19.57000:05:19.580 screws but if you take one of these out 00:05:21.52000:05:21.530 that screw breaks I've seen our guys 00:05:23.11000:05:23.120 make a hole here next to that too to get 00:05:26.11000:05:26.120 that igniter in there that won't seal 00:05:28.08900:05:28.099 that hole properly and you'll get you 00:05:30.27900:05:30.289 know improper pressures on the inside of 00:05:32.68000:05:32.690 that heat exchanger you need to replace 00:05:34.36000:05:34.370 that burner plate these plates are two 00:05:36.33900:05:36.349 three four hundred dollars depending on 00:05:38.11000:05:38.120 the unit very easy to replace whenever 00:05:40.87000:05:40.880 you have one of those with the broken 00:05:42.12900:05:42.139 screw and it just quote replacing the 00:05:43.93000:05:43.940 burner plate so with all that said guys 00:05:46.83900:05:46.849 I'm gonna fire this unit up it's gonna 00:05:48.55000:05:48.560 get kind of loud here so I'm gonna try 00:05:51.37000:05:51.380 to talk as loud as I can but what I'm 00:06:01.30000:06:01.310 gonna do first guys is I'm checking I'm 00:06:03.85000:06:03.860 gonna set this on p1 which is my Inlet 00:06:06.49000:06:06.500 port on my manometer so I can check 00:06:08.89000:06:08.900 water together 00:06:09.91000:06:09.920 I'm gonna check in with gas pressure 00:06:12.36000:06:12.370 from the gas regulator into the unit 00:06:16.81000:06:16.820 should be eight to ten inches of water 00:06:18.82000:06:18.830 column with the unit's start and get the 00:06:22.69000:06:22.700 heat button on it it's loud so we're 00:06:24.37000:06:24.380 trying to stand back here a little ways 00:06:26.07000:06:26.080 as soon as the heat lights and it's an 00:06:29.38000:06:29.390 eye fire and I've got stable combustion 00:06:31.60000:06:31.610 then I will adjust the gas regulator to 00:06:36.97000:06:36.980 get eight to ten inches of water column 00:06:39.04000:06:39.050 on the inlet side the bottom side of the 00:06:41.50000:06:41.510 gas bag 00:06:44.24000:06:44.250 here's a white 00:06:47.18000:06:47.190 soon as adults 00:06:49.39000:06:49.400 video assistant here kind of go back and 00:06:52.48000:06:52.490 forth between me on the regulator and 00:06:54.58000:06:54.590 the manometer so you guys can see what 00:06:56.46900:06:56.479 I'm adjusting and then the second 00:06:58.99000:06:59.000 adjustment would be me adjusting the 00:07:00.70000:07:00.710 outlet 00:07:05.77000:07:05.780 in the first 00:07:08.74000:07:08.750 yeah you guys can hear a welcome a 00:07:10.45000:07:10.460 little bit 00:07:20.90900:07:20.919 when I just listed 00:07:28.61000:07:28.620 the inlet gas pressure 00:07:36.30000:07:36.310 don't eat the damages 00:07:43.33000:07:43.340 I'm turning it up turning it clockwise 00:07:47.26000:07:47.270 I'm adding a little bit of gas pressure 00:07:55.26000:07:55.270 so now 00:08:01.06000:08:01.070 Jacobi outlet 00:08:06.24000:08:06.250 we do 00:08:09.64000:08:09.650 3/6 00:08:11.64000:08:11.650 I'm gonna adjust this screw to do that 00:08:24.71000:08:24.720 getting close guys 00:08:30.04000:08:30.050 - negative 0.36 00:08:39.43000:08:39.440 we got the pressure style then the thing 00:08:42.32000:08:42.330 kind of the the unit calmed down a 00:08:43.96900:08:43.979 little bit in the whooping sound went 00:08:45.62000:08:45.630 away I'm gonna shut this unit off we're 00:08:47.72000:08:47.730 gonna go over and take a look at a unit 00:08:49.28000:08:49.290 that's apart and show you a couple of 00:08:55.13000:08:55.140 tricks over here I've got it torn apart 00:08:56.54000:08:56.550 already but 00:09:03.30000:09:03.310 what I wanted to show you guys is now 00:09:07.03000:09:07.040 the screen is in here dropped order sits 00:09:10.93000:09:10.940 here so you take the draft motor out gas 00:09:13.44900:09:13.459 comes in through this orifice from the 00:09:15.46000:09:15.470 gas valve air is drawn through these 00:09:17.86000:09:17.870 holes into the draft motor mixes in the 00:09:22.21000:09:22.220 draft motor wheel and is injected in 00:09:25.05000:09:25.060 through this first pre screen this 00:09:27.91000:09:27.920 screen is designed just to keep the dirt 00:09:29.47000:09:29.480 note of the the mains burner screen 00:09:34.00000:09:34.010 which is inside so don't ever leave this 00:09:37.18000:09:37.190 screen out guys this one has a purpose 00:09:39.22000:09:39.230 and it should be cleaned on a regular 00:09:41.05000:09:41.060 basis that string gets dirty also but 00:09:44.68000:09:44.690 the screen can also get worked guys if 00:09:46.81000:09:46.820 you over fire these that wolfing sound 00:09:49.48000:09:49.490 whether you've got combustion going on 00:09:51.16000:09:51.170 and off on and off on and off it'll 00:09:53.35000:09:53.360 create little explosions in between 00:09:55.03000:09:55.040 those plates and the screen the 00:09:56.29000:09:56.300 combustion is supposed to be on the 00:09:57.55000:09:57.560 other side of that plate on the back 00:09:59.59000:09:59.600 side it'll warp that plate that plate is 00:10:02.29000:10:02.300 concave for a reason it shapes the 00:10:04.26900:10:04.279 combustion so once I've had one that's 00:10:07.32900:10:07.339 done that or I'm having continuous 00:10:08.82900:10:08.839 problems I will typically just replace 00:10:10.66000:10:10.670 that plate if it's got a busted screw if 00:10:14.17000:10:14.180 it's got a leak and it's got a crack 00:10:16.38000:10:16.390 I've replaced probably three or four of 00:10:18.81900:10:18.829 those a year we're gonna go back over to 00:10:20.47000:10:20.480 this other unit I'm going to show you a 00:10:21.76000:10:21.770 couple of quick tricks on electrical 00:10:23.29000:10:23.300 stuff 00:10:33.67000:10:33.680 so something else guys I want to show 00:10:36.14000:10:36.150 you on a train that some some guys don't 00:10:38.84000:10:38.850 know I didn't know for a while is the 00:10:40.73000:10:40.740 line item on the right side of the print 00:10:42.62000:10:42.630 here if you're looking for something in 00:10:44.48000:10:44.490 a train electrical print find it in the 00:10:47.24000:10:47.250 nomenclature if you go over to the line 00:10:49.51900:10:49.529 item number the line line item number if 00:10:53.00000:10:53.010 you look on the left side of a train 00:10:54.95000:10:54.960 print there is line items and you will 00:10:58.07000:10:58.080 find what you're looking for it will 00:10:59.42000:10:59.430 tell you which line in the print your 00:11:01.93000:11:01.940 your device is on so this part of a 00:11:05.69000:11:05.700 train electrical print is really helpful 00:11:07.49000:11:07.500 once you understand how to use things 00:11:10.37000:11:10.380 guys is a this is the primary limit 00:11:16.51900:11:16.529 switch on a train T Co one the secondary 00:11:22.22000:11:22.230 limit switch on a train is here in the 00:11:24.05000:11:24.060 blower section t co2 these sometimes 00:11:28.40000:11:28.410 have a third wire connected to them so 00:11:30.32000:11:30.330 if you have a blower running on a train 00:11:32.15000:11:32.160 and you don't think the blower should be 00:11:33.53000:11:33.540 running if this is switch trips and 00:11:35.30000:11:35.310 fails it'll energize the fan it's a way 00:11:39.02000:11:39.030 to if the unit trips on high temp it'll 00:11:41.21000:11:41.220 make the fan run until it cools off the 00:11:43.13000:11:43.140 unit so with all that said guys I hope 00:11:46.43000:11:46.440 that helps on these units that's all 00:11:50.45000:11:50.460 I've got for tonight 00:11:51.62000:11:51.630 so I appreciate you guys watching hope 00:11:54.29000:11:54.300 these videos help you happy learning and 00:11:56.87000:11:56.880 training and be safe out there guys 00:11:58.85000:11:58.860 thanks goodnight
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