1 00:00:00,000 --> 00:00:07,000 Welcome back to Teaching the Unteachables, where we dive into teaching and learning methodologies 2 00:00:07,000 --> 00:00:10,320 for professionals like you. 3 00:00:10,320 --> 00:00:16,400 This recording is from a portion of episode 73 of Did You Know the ESCO HVAC Show. 4 00:00:16,400 --> 00:00:24,680 Learn more at escogroup.org as well as hvacredu.net. 5 00:00:24,680 --> 00:00:29,320 Well hello everyone, thank you for joining Did You Know the ESCO HVAC Show. 6 00:00:29,320 --> 00:00:32,320 We are joined this week by Todd Kler from hvacredu.net. 7 00:00:32,320 --> 00:00:33,320 How's it going Todd? 8 00:00:33,320 --> 00:00:34,320 Howdy. 9 00:00:34,320 --> 00:00:37,920 I thought I was going to be running on this one solo because I've got Ty, I've got Daniel, 10 00:00:37,920 --> 00:00:42,360 and I've got Eugene all down at the symposium, down at Brian Orr Symposium in Florida. 11 00:00:42,360 --> 00:00:44,640 We had AHR last week, which was insane. 12 00:00:44,640 --> 00:00:46,960 A lot of stuff going on. 13 00:00:46,960 --> 00:00:51,280 So this kind of segues into what did we find at AHR, right? 14 00:00:51,280 --> 00:00:55,920 We found lots and lots and lots of inverters, lots of A2L. 15 00:00:55,920 --> 00:00:58,080 We've seen a lot of communicating equipment. 16 00:00:58,080 --> 00:01:00,400 And I always preach about the communicating equipment. 17 00:01:00,400 --> 00:01:04,360 And you and I, we have some fun conversations about what is happening in the automotive 18 00:01:04,360 --> 00:01:07,160 industry, especially when we talk about communication stuff, right? 19 00:01:07,160 --> 00:01:08,160 Indeed. 20 00:01:08,160 --> 00:01:12,120 Yeah, automotive, there was a time when every different manufacturer had their own code 21 00:01:12,120 --> 00:01:13,120 reader. 22 00:01:13,120 --> 00:01:16,560 You had to plug in and see what was going on, on a 5 volt DC communicating network, by the 23 00:01:16,560 --> 00:01:17,560 way. 24 00:01:17,560 --> 00:01:18,560 Right. 25 00:01:18,560 --> 00:01:22,640 And so when we get into talking about new technology, a lot of us are uncomfortable 26 00:01:22,640 --> 00:01:25,120 with communicating equipment. 27 00:01:25,120 --> 00:01:29,080 Now I'm going to break this into two different types of communicating equipment. 28 00:01:29,080 --> 00:01:30,880 We're only going to cover one today. 29 00:01:30,880 --> 00:01:31,880 Hopefully we'll get through all of it. 30 00:01:31,880 --> 00:01:34,800 I've got a ton of stuff for us to talk about. 31 00:01:34,800 --> 00:01:38,080 Today we're going to talk about unitary communicating, and we're going to talk about all of the different 32 00:01:38,080 --> 00:01:42,920 manufacturers and how they really are on the same platform and how to test those platforms, 33 00:01:42,920 --> 00:01:45,080 how to see when you have problems on a network. 34 00:01:45,080 --> 00:01:49,640 And then on another episode, we're going to talk about our, let's call it ductless communicating, 35 00:01:49,640 --> 00:01:52,320 our higher DC voltage communicating platform. 36 00:01:52,320 --> 00:01:56,480 So Todd, you spent a lot of time in the BAS side of things, building automations, and 37 00:01:56,480 --> 00:01:58,920 you guys have got a great course over at HVACR EDU. 38 00:01:58,920 --> 00:02:05,040 And so BAS and our unitary communicating really are very similar. 39 00:02:05,040 --> 00:02:06,560 The six one half does the other, right? 40 00:02:06,560 --> 00:02:08,360 I mean, they're very similar the way they communicate. 41 00:02:08,360 --> 00:02:10,680 It's going to be a DC voltage, right? 42 00:02:10,680 --> 00:02:11,680 Usually a 5 volt DC. 43 00:02:11,680 --> 00:02:15,480 Very, very, very similar to a pulse width modulation. 44 00:02:15,480 --> 00:02:18,080 We may have heard that in the industry, right? 45 00:02:18,080 --> 00:02:19,080 Absolutely. 46 00:02:19,080 --> 00:02:25,920 So that communication, here we have a master slave type application, and this is very similar 47 00:02:25,920 --> 00:02:29,960 to the RS85 cabling that we are used to. 48 00:02:29,960 --> 00:02:38,240 Usually a four wire lead wire and usually two communication and two or one for voltage 49 00:02:38,240 --> 00:02:40,480 for the power to the device usually. 50 00:02:40,480 --> 00:02:41,480 Absolutely. 51 00:02:41,480 --> 00:02:43,600 Maybe sometimes 24 depending on the device. 52 00:02:43,600 --> 00:02:44,600 Exactly. 53 00:02:44,600 --> 00:02:45,600 And then the common, right? 54 00:02:45,600 --> 00:02:47,400 You got to make that complete circuit. 55 00:02:47,400 --> 00:02:51,560 So when we look at that communicating platform, this is very important for people to understand 56 00:02:51,560 --> 00:02:54,660 that we're going to look at all these different manufacturers and you're going to see a similarity. 57 00:02:54,660 --> 00:02:59,760 You're going to see in a lot of these, a four wire system, two that we're going to communicate 58 00:02:59,760 --> 00:03:02,480 on and two that we're going to supply power. 59 00:03:02,480 --> 00:03:07,240 Now we do get into some differences in the way we communicate, but it was all very much 60 00:03:07,240 --> 00:03:08,240 the same. 61 00:03:08,240 --> 00:03:14,960 So if we look at this basic layout of what we call an RJ45 communication, so where we're 62 00:03:14,960 --> 00:03:18,920 talking about like cat six cables or cab, what, when we're looking at communication 63 00:03:18,920 --> 00:03:25,200 cables, a lot of different industries use a same or similar platform. 64 00:03:25,200 --> 00:03:31,440 So even our ethernet cables, we're using a variable five volt DC. 65 00:03:31,440 --> 00:03:34,240 It's typically it's a 0.25, but it's plus or minus. 66 00:03:34,240 --> 00:03:37,580 And I'll show you what that looks like here in just a second, how we get to that. 67 00:03:37,580 --> 00:03:41,680 But we've got some supply voltages and we got some communicating voltages. 68 00:03:41,680 --> 00:03:46,120 And we're going to go through all of our manufacturers here and there are some that are better at 69 00:03:46,120 --> 00:03:48,400 giving information into it. 70 00:03:48,400 --> 00:03:49,920 And then some that are not. 71 00:03:49,920 --> 00:03:54,280 So Todd, you want to break down just a little bit about some of the decoding. 72 00:03:54,280 --> 00:03:55,280 Yeah. 73 00:03:55,280 --> 00:04:00,600 So most of us, at least in the, in the residential or unitary type split systems are custom to 74 00:04:00,600 --> 00:04:02,460 24 volt, right? 75 00:04:02,460 --> 00:04:07,220 Our thermostat in a 24 volt system, we have a thermostat in a communicating system. 76 00:04:07,220 --> 00:04:12,440 It's no longer a thermostat is now a control or controller, right? 77 00:04:12,440 --> 00:04:18,280 And the 24 volt system, it's just a, or a deck thermostat is just a fancy switch and 78 00:04:18,280 --> 00:04:19,360 it sins. 79 00:04:19,360 --> 00:04:22,840 It's going to, it's going to be a light switch, right? 80 00:04:22,840 --> 00:04:25,400 But in this case, 24 volts typically. 81 00:04:25,400 --> 00:04:30,180 And in doing so we either tell the heat to come on to come on, or we tell the compressor 82 00:04:30,180 --> 00:04:33,880 to come on sometimes in some cases to speed, right? 83 00:04:33,880 --> 00:04:34,880 We have a two speed. 84 00:04:34,880 --> 00:04:35,880 That's right. 85 00:04:35,880 --> 00:04:37,400 So we're not communicating. 86 00:04:37,400 --> 00:04:38,400 Okay. 87 00:04:38,400 --> 00:04:43,920 But when we dive down that, that communicating, where usually we get that four wire to gating 88 00:04:43,920 --> 00:04:50,360 and to, to, to, to other 24 volt or 12 volts depending on the manufacturer and a common, 89 00:04:50,360 --> 00:04:51,360 right? 90 00:04:51,360 --> 00:04:57,160 So there's your four that DC DC voltage is usually five ish volts and it'll pulse width. 91 00:04:57,160 --> 00:04:58,160 Right? 92 00:04:58,160 --> 00:05:00,840 So it'll, it'll on it exactly. 93 00:05:00,840 --> 00:05:08,280 The voltage come on for a half a second, millisecond and go off and that language or how long it's, 94 00:05:08,280 --> 00:05:15,720 how long it stays on or off is, is interpreted by a language and actually a protocol and 95 00:05:15,720 --> 00:05:20,720 that protocol will speak to that, to that controller or module or the PC board that 96 00:05:20,720 --> 00:05:22,740 is communicating with inputs outputs, right? 97 00:05:22,740 --> 00:05:27,020 We're going to get those signals from thermistors, pressure transducers. 98 00:05:27,020 --> 00:05:32,680 It's going to say, Hey, at this pressure, at this temperature, do this, or Hey, do this 99 00:05:32,680 --> 00:05:35,640 when you get to these pressures or temperatures or whatever it might be. 100 00:05:35,640 --> 00:05:36,800 And we do it in those pulses. 101 00:05:36,800 --> 00:05:39,240 And that's the important part to understand. 102 00:05:39,240 --> 00:05:43,400 Remember that AC was just a simple command 24 volt on or off. 103 00:05:43,400 --> 00:05:48,880 Well, we're now going to do this in pulses that are going to be on or off, but the amount 104 00:05:48,880 --> 00:05:54,920 of time that we are on and the amount of time that we're off are going to be the language 105 00:05:54,920 --> 00:05:56,520 that we're speaking. 106 00:05:56,520 --> 00:06:00,200 And many of our different manufacturers use different languages. 107 00:06:00,200 --> 00:06:04,600 We're really just talking about different spacings within one relation, right? 108 00:06:04,600 --> 00:06:08,560 And we can, yeah, it's all ones and zeros and we can actually read that. 109 00:06:08,560 --> 00:06:10,920 Now we're not going to go this deep on it. 110 00:06:10,920 --> 00:06:13,920 We we're not going to bring it on a oscilloscope, although maybe down the road we'll do this 111 00:06:13,920 --> 00:06:15,880 so we can actually talk about it a little bit. 112 00:06:15,880 --> 00:06:19,040 So if we were to put an oscilloscope on a communicating network, we're actually going 113 00:06:19,040 --> 00:06:24,220 to see our ones and zeros, but we're also going to see those as a positive reference 114 00:06:24,220 --> 00:06:26,820 to ground and as a negative reference to ground. 115 00:06:26,820 --> 00:06:32,400 We're actually going to go both directions because they came from our AC sine wave. 116 00:06:32,400 --> 00:06:37,100 So the important thing to remember is all of these DC communicating voltages started 117 00:06:37,100 --> 00:06:40,220 with our 24 volt AC power supply. 118 00:06:40,220 --> 00:06:44,360 So where do our DC circuits begin? 119 00:06:44,360 --> 00:06:47,480 Typically it starts at our indoor unit for residential unitary split systems. 120 00:06:47,480 --> 00:06:52,080 It starts at our furnace or our air handler where our original power supply was at. 121 00:06:52,080 --> 00:06:56,920 So we'll take that AC voltage, we'll turn it into the DC voltage, and then we will start 122 00:06:56,920 --> 00:06:58,560 pulsing that thing. 123 00:06:58,560 --> 00:07:02,720 You may mention that, you know, we get that that transform or 24 volts from our indoor 124 00:07:02,720 --> 00:07:03,720 unit. 125 00:07:03,720 --> 00:07:06,360 Do keep in mind this is unitary, usually a split system. 126 00:07:06,360 --> 00:07:11,200 Now when we go to when we do go and talk about ductless split system, then it's coming from 127 00:07:11,200 --> 00:07:12,200 the outdoor unit. 128 00:07:12,200 --> 00:07:13,200 So just keep that in mind. 129 00:07:13,200 --> 00:07:15,920 Everyone's going to hey, time out that that comes from the outdoor unit. 130 00:07:15,920 --> 00:07:16,920 Yeah. 131 00:07:16,920 --> 00:07:17,920 And I'm ductless system. 132 00:07:17,920 --> 00:07:18,920 Exactly. 133 00:07:18,920 --> 00:07:22,280 So our inverters that have a power supply at the outdoor unit, they will typically have 134 00:07:22,280 --> 00:07:23,280 their own as well. 135 00:07:23,280 --> 00:07:25,680 And we'll show you a little bit on what that one is. 136 00:07:25,680 --> 00:07:30,560 So for those that are comfortable with the Dyken platform or the earlier Goodman and 137 00:07:30,560 --> 00:07:35,400 Manna stuff that was using the climate talk platform, let's let's look at this real quick. 138 00:07:35,400 --> 00:07:37,420 Remember those four wires, Todd? 139 00:07:37,420 --> 00:07:41,560 What we're going to use in this particular platform, we're actually going to use two 140 00:07:41,560 --> 00:07:45,080 of those for 24 volt AC. 141 00:07:45,080 --> 00:07:49,540 So that great big colorful screen that we have on our thermostat, right? 142 00:07:49,540 --> 00:07:52,200 We still need to light up if we put batteries in it, we know what's going to happen that 143 00:07:52,200 --> 00:07:55,720 we had seen that back in the early 2000s when you put batteries in the digital thermostat, 144 00:07:55,720 --> 00:07:57,140 you burn them up. 145 00:07:57,140 --> 00:08:03,960 So we're actually going to use two of those for 24 volts AC, R and C just like normal. 146 00:08:03,960 --> 00:08:06,160 And that common is actually very important. 147 00:08:06,160 --> 00:08:12,540 It is a reference to remember what we do with the 24 volt side of the transformer. 148 00:08:12,540 --> 00:08:14,500 We ground it, right? 149 00:08:14,500 --> 00:08:16,160 So we have to, we have to. 150 00:08:16,160 --> 00:08:21,520 So on a grounded transformer, our common is actually connected to ground. 151 00:08:21,520 --> 00:08:26,680 This is very important when we start looking at and testing the communication. 152 00:08:26,680 --> 00:08:27,760 We look at this communication. 153 00:08:27,760 --> 00:08:31,200 So we're going to run four wires from the thermostat to the indoor unit. 154 00:08:31,200 --> 00:08:35,240 And depending if we're talking about like the fit system uses a electronic expansion 155 00:08:35,240 --> 00:08:36,920 valve, we've got a board on that as well. 156 00:08:36,920 --> 00:08:39,200 So we're going to use AC for powering our controls. 157 00:08:39,200 --> 00:08:42,160 We're going to use our communicating the two wires. 158 00:08:42,160 --> 00:08:45,000 They're going to do this on number one and number two. 159 00:08:45,000 --> 00:08:48,240 And so they're going to supply two wires to the outdoor unit. 160 00:08:48,240 --> 00:08:53,000 And when we're using a communicating outdoor unit, the board of the outdoor unit actually 161 00:08:53,000 --> 00:08:54,640 has a power supply built on it. 162 00:08:54,640 --> 00:08:59,640 So we're not going to be connecting R and C. We're just supplying the two wires. 163 00:08:59,640 --> 00:09:04,920 But if we have a bad ground within the system, we can really have some issues. 164 00:09:04,920 --> 00:09:06,520 And I'll talk about that here in a minute. 165 00:09:06,520 --> 00:09:10,240 Once we get a little deeper into what's going on with these wires, it'll make so much more 166 00:09:10,240 --> 00:09:11,240 sense. 167 00:09:11,240 --> 00:09:13,280 So what are we actually doing to get those DC signals? 168 00:09:13,280 --> 00:09:18,260 Well, with this particular platform and with many of them, when we take our AC sine wave, 169 00:09:18,260 --> 00:09:22,880 we actually, because we have a grounded circuit, we have a reference point. 170 00:09:22,880 --> 00:09:29,180 And so now we'll actually utilize the voltages that are above neutral or ground and the voltages 171 00:09:29,180 --> 00:09:30,560 below. 172 00:09:30,560 --> 00:09:34,840 So we're going to have one signal that's in positive reference to ground and one signal 173 00:09:34,840 --> 00:09:37,020 that is in negative reference to ground. 174 00:09:37,020 --> 00:09:40,420 And that is the number one and number two wires. 175 00:09:40,420 --> 00:09:48,040 So when we use our circuit to be able to rectify our AC, we're going to get a DC looking signal 176 00:09:48,040 --> 00:09:49,400 because it's going to be chopped off. 177 00:09:49,400 --> 00:09:51,320 And now we're going to do these pulses within it. 178 00:09:51,320 --> 00:09:56,240 Think about it as like SOS, you know, inside of that wavelength, right? 179 00:09:56,240 --> 00:09:59,480 That's a great way to explain it is your Morse code, right? 180 00:09:59,480 --> 00:10:01,060 All it is. 181 00:10:01,060 --> 00:10:04,040 Our spacing, our timing is all we're actually doing. 182 00:10:04,040 --> 00:10:06,080 And that zero voltage baseline. 183 00:10:06,080 --> 00:10:09,520 I don't know if you all remember maybe in some of the furnaces you plug in. 184 00:10:09,520 --> 00:10:15,120 And if you have a two prong and you don't have that ground and then all of a sudden 185 00:10:15,120 --> 00:10:16,120 your PC to board doesn't work. 186 00:10:16,120 --> 00:10:17,120 It doesn't like it. 187 00:10:17,120 --> 00:10:19,120 This has no reference to ground. 188 00:10:19,120 --> 00:10:20,880 No reference point for our voltage. 189 00:10:20,880 --> 00:10:28,300 So those two wires have a reference to ground that number one and number two have a reference 190 00:10:28,300 --> 00:10:29,860 to the ground. 191 00:10:29,860 --> 00:10:34,920 And there's a difference between the two of them that we're going to call the bias. 192 00:10:34,920 --> 00:10:40,000 So with this particular system, this climate talk system that we're using with Dyken and 193 00:10:40,000 --> 00:10:45,400 some of the earlier Good Minimana stuff, we are going to be able to measure from ground 194 00:10:45,400 --> 00:10:50,540 to number one and from ground to number two and get two different voltages. 195 00:10:50,540 --> 00:10:53,760 And what a lot of people don't realize is that difference between them, that bias is 196 00:10:53,760 --> 00:10:55,000 actually our bandwidth. 197 00:10:55,000 --> 00:11:01,240 So about a year ago, I did a class with John Brown over EWC where we went really deep into 198 00:11:01,240 --> 00:11:02,240 this. 199 00:11:02,240 --> 00:11:03,240 Exactly. 200 00:11:03,240 --> 00:11:05,360 So I'll talk about that on this finished edited video. 201 00:11:05,360 --> 00:11:08,080 I'll make sure to put a reference to get back to that one so you can understand what that 202 00:11:08,080 --> 00:11:11,280 entire bandwidth looks like, how to set the bias. 203 00:11:11,280 --> 00:11:13,640 If your bandwidth's not good, how you adjust that. 204 00:11:13,640 --> 00:11:15,560 But for today, we're not going to go that deep. 205 00:11:15,560 --> 00:11:21,680 I just want you to understand when you're looking at that, we actually have those signals 206 00:11:21,680 --> 00:11:27,660 above ground and below ground in reference, right? 207 00:11:27,660 --> 00:11:31,920 So some positive, some that are actually negative. 208 00:11:31,920 --> 00:11:39,120 So if we were having a problem on a communicating system on the climate talk network, we could 209 00:11:39,120 --> 00:11:47,760 actually take our meter and we could measure from common over to number one. 210 00:11:47,760 --> 00:11:50,860 And we should be reading a positive 2.8 volts DC. 211 00:11:50,860 --> 00:11:52,860 There is a difference when we have an air handler. 212 00:11:52,860 --> 00:11:55,240 It only uses three volts DC. 213 00:11:55,240 --> 00:11:58,240 And we can actually talk about that if anyone's ever, if they're really interested, I can 214 00:11:58,240 --> 00:12:01,400 show you the math on how to figure out the bias on an air handler that's using three 215 00:12:01,400 --> 00:12:03,320 volts DC and five volts DC. 216 00:12:03,320 --> 00:12:04,320 It's simple. 217 00:12:04,320 --> 00:12:07,260 You take the two that are on number one, you add them divided by in half. 218 00:12:07,260 --> 00:12:09,480 Take the two for number two, add them divided in half. 219 00:12:09,480 --> 00:12:14,000 And so the difference between those should still be that 0.6 volts DC or greater. 220 00:12:14,000 --> 00:12:18,920 Now if we took our meter and we went from common to number two, we're going to see that 221 00:12:18,920 --> 00:12:21,880 we're going to have that 2.2 volts DC. 222 00:12:21,880 --> 00:12:22,880 It's a negative, right? 223 00:12:22,880 --> 00:12:27,380 So we have a positive and then a negative voltage gives us a bias of 0.6 volts. 224 00:12:27,380 --> 00:12:29,300 Here's the thing. 225 00:12:29,300 --> 00:12:37,360 If we do not have 0.6 volts DC bias or greater on the climate talk network, you're coming 226 00:12:37,360 --> 00:12:38,360 back. 227 00:12:38,360 --> 00:12:41,140 It's that simple. 228 00:12:41,140 --> 00:12:42,600 It really is. 229 00:12:42,600 --> 00:12:46,080 You can literally measure between number one and number two. 230 00:12:46,080 --> 00:12:50,780 And if you have less than 0.6 volts DC on a climate talk network, you do not have a 231 00:12:50,780 --> 00:12:52,840 stable bandwidth. 232 00:12:52,840 --> 00:12:56,660 You have conductors that are corroded because a mouse has chewed on them. 233 00:12:56,660 --> 00:12:59,420 You have conductors that have kinked or broken. 234 00:12:59,420 --> 00:13:02,400 You have conductors that are not landed properly on the terminals. 235 00:13:02,400 --> 00:13:07,780 You have wire nuts sitting outside from your existing solid wire that got water in them 236 00:13:07,780 --> 00:13:12,780 that corroded and no longer allow the communicating voltage because we don't have the amount of 237 00:13:12,780 --> 00:13:14,700 current that we had with AC. 238 00:13:14,700 --> 00:13:17,700 It's very, very, very low current. 239 00:13:17,700 --> 00:13:21,100 So it's super simple to check the bandwidth. 240 00:13:21,100 --> 00:13:25,460 So if I'm an educator, I'm bringing in a new dyken communicating system, I'm connecting 241 00:13:25,460 --> 00:13:26,460 it. 242 00:13:26,460 --> 00:13:32,020 And I actually can now show my students how to make sure that my network is good and operating 243 00:13:32,020 --> 00:13:33,200 properly. 244 00:13:33,200 --> 00:13:36,540 If it's not, this is where you start. 245 00:13:36,540 --> 00:13:38,660 You start on the bias voltages. 246 00:13:38,660 --> 00:13:42,820 So if I am trying to isolate a system, say I've got all these components hooked up, this 247 00:13:42,820 --> 00:13:46,420 particular one, I got my thermostat, I got my indoor furnace, I got my cased coil, and 248 00:13:46,420 --> 00:13:48,140 I got my outdoor unit. 249 00:13:48,140 --> 00:13:52,060 If I am struggling for communication, I just start it. 250 00:13:52,060 --> 00:13:53,060 Where would I start, Todd? 251 00:13:53,060 --> 00:13:55,300 Where does my DC voltage begin? 252 00:13:55,300 --> 00:13:56,660 It's going to be at the ground. 253 00:13:56,660 --> 00:13:58,460 You got to get a reference point. 254 00:13:58,460 --> 00:14:02,100 You got to get a reference point of ground and power at our indoor unit. 255 00:14:02,100 --> 00:14:06,900 So worst case scenario, disconnect all your wiring, check it, make sure we got our 2.8, 256 00:14:06,900 --> 00:14:10,820 2.2 or 0.6 bias difference at our indoor unit. 257 00:14:10,820 --> 00:14:15,900 It's going to be 1.9 and 1.3 on an air handler, but it's still a 0.6 difference. 258 00:14:15,900 --> 00:14:17,740 And then start adding my parts. 259 00:14:17,740 --> 00:14:23,180 When I add something on and my voltage bias changes, guess what? 260 00:14:23,180 --> 00:14:24,500 0.6. 261 00:14:24,500 --> 00:14:26,860 If it's not, I've just found my problem. 262 00:14:26,860 --> 00:14:32,060 Now, I will talk about one really oddball one that I have found, and after I found it, 263 00:14:32,060 --> 00:14:33,060 it made sense. 264 00:14:33,060 --> 00:14:34,060 Look at that outdoor unit. 265 00:14:34,060 --> 00:14:36,820 I've got two wires, right, going to the outdoor unit. 266 00:14:36,820 --> 00:14:38,700 So I'm communicating my DC voltages. 267 00:14:38,700 --> 00:14:43,860 So where is my reference point, Todd? 268 00:14:43,860 --> 00:14:45,500 From the indoor to outdoor? 269 00:14:45,500 --> 00:14:47,500 Yeah, there's no wire. 270 00:14:47,500 --> 00:14:50,580 Where would my outdoor unit find as a reference to ground? 271 00:14:50,580 --> 00:14:53,380 Well, it is connected to hopefully a disconnect. 272 00:14:53,380 --> 00:14:55,140 That disconnect hopefully is grounded. 273 00:14:55,140 --> 00:15:01,060 So back to the equipment ground, back to the panel. 274 00:15:01,060 --> 00:15:05,700 So I had a technician that called me and said, hey, I've got good bias voltage at my indoor, 275 00:15:05,700 --> 00:15:08,500 at my thermostat, and my EEV, my outdoor unit. 276 00:15:08,500 --> 00:15:11,980 I've got some janky voltages and my bias is not right. 277 00:15:11,980 --> 00:15:14,180 I'm like, well, that's really interesting. 278 00:15:14,180 --> 00:15:16,980 Let's check your voltages to ground and check the voltages to ground. 279 00:15:16,980 --> 00:15:19,020 And they were low at the outdoor unit. 280 00:15:19,020 --> 00:15:21,860 So I had him disconnect the wires from the outdoor unit, check the wires going to the 281 00:15:21,860 --> 00:15:22,860 outdoor unit. 282 00:15:22,860 --> 00:15:24,180 The wires were good. 283 00:15:24,180 --> 00:15:27,140 So as soon as we connected it to the outdoor unit, the voltage dropped. 284 00:15:27,140 --> 00:15:30,380 And I thought, well, maybe it's a board or is there something else? 285 00:15:30,380 --> 00:15:32,820 I thought, well, let's go check all of our ground. 286 00:15:32,820 --> 00:15:38,100 And we found a corroded lug inside of the disconnect that had poor connection. 287 00:15:38,100 --> 00:15:41,860 So the path could not make it back to the electrical panel to the indoor unit. 288 00:15:41,860 --> 00:15:44,580 The reference point was bad. 289 00:15:44,580 --> 00:15:45,580 Clean the wire. 290 00:15:45,580 --> 00:15:50,620 I've seen on rare occasions, by a handful of times, maybe half a dozen times throughout 291 00:15:50,620 --> 00:15:57,740 my career, the euphor, the residential or even commercial, the euphor, did that. 292 00:15:57,740 --> 00:15:59,660 It got corroded, got water on it. 293 00:15:59,660 --> 00:16:03,020 And that euphor, that reference ground, that rod that goes what, six, eight feet in the 294 00:16:03,020 --> 00:16:05,020 ground was corroded. 295 00:16:05,020 --> 00:16:06,020 Yeah, absolutely. 296 00:16:06,020 --> 00:16:09,620 Remember on that AC system that was using 24 volts AC to run a contactor? 297 00:16:09,620 --> 00:16:10,780 It didn't care. 298 00:16:10,780 --> 00:16:13,340 It had enough AC voltage running to the compressor. 299 00:16:13,340 --> 00:16:17,140 It may not have been the safest thing in the world, but it didn't affect the way that our 300 00:16:17,140 --> 00:16:24,020 24 volts AC operated contactor, but could absolutely with the communicating system. 301 00:16:24,020 --> 00:16:31,420 So I have had incidents where I had bad ground wiring that was not able to be reconnected 302 00:16:31,420 --> 00:16:32,540 properly. 303 00:16:32,540 --> 00:16:37,980 And so we would simply connect common from the indoor to common of the outdoor. 304 00:16:37,980 --> 00:16:42,780 Cannot use R because we already have a power supply at the outdoor unit on those, but we 305 00:16:42,780 --> 00:16:45,700 could use common as a backup. 306 00:16:45,700 --> 00:16:46,700 Okay. 307 00:16:46,700 --> 00:16:48,420 So that's an overview of our Dyken. 308 00:16:48,420 --> 00:16:51,220 We learned a lot about what's going on in that one. 309 00:16:51,220 --> 00:16:54,260 So let's look at the other networks and see how similar they are. 310 00:16:54,260 --> 00:16:55,700 Now we'll see one in the JCI side. 311 00:16:55,700 --> 00:16:58,720 A lot of times you'll see it referenced as echelon. 312 00:16:58,720 --> 00:17:01,380 It really is their communicating system. 313 00:17:01,380 --> 00:17:05,900 Yeah, I see two primary connections because they've had a couple different generations 314 00:17:05,900 --> 00:17:06,900 of it, right? 315 00:17:06,900 --> 00:17:12,300 So you'll see one that is labeled A, R, C, B, primarily using green, red, black, and 316 00:17:12,300 --> 00:17:13,880 blue or white wires. 317 00:17:13,880 --> 00:17:22,060 And then you can also see a variation of that that is just common B and A. And I like finding 318 00:17:22,060 --> 00:17:23,340 this one in their service manuals. 319 00:17:23,340 --> 00:17:25,300 Remember, almost all of this comes right out of the service manuals. 320 00:17:25,300 --> 00:17:26,740 This is not like hidden stuff. 321 00:17:26,740 --> 00:17:28,980 You have to read it to find it. 322 00:17:28,980 --> 00:17:30,460 It's in there. 323 00:17:30,460 --> 00:17:31,660 You have to read? 324 00:17:31,660 --> 00:17:33,340 You have to read, right? 325 00:17:33,340 --> 00:17:37,860 That ground rod is absolutely, and we've got places out West that don't have ground rods. 326 00:17:37,860 --> 00:17:42,700 They have ground arrays where they have shallow wide grounding. 327 00:17:42,700 --> 00:17:46,460 But it is absolutely in a dry condition and it becomes less of a conductor. 328 00:17:46,460 --> 00:17:50,860 So it's very important to understand that that ground is part of our communicating network. 329 00:17:50,860 --> 00:17:54,060 We didn't think about that before, but it is now. 330 00:17:54,060 --> 00:17:59,420 So let's look at this JCI one and we'll see that either way you look at it, we've still 331 00:17:59,420 --> 00:18:01,380 got a common. 332 00:18:01,380 --> 00:18:06,820 We have A, which is our positive reference, and B, which is a negative reference. 333 00:18:06,820 --> 00:18:13,620 If we go back to the other diagram, which is their newer design, we still have R. We 334 00:18:13,620 --> 00:18:14,620 still have common. 335 00:18:14,620 --> 00:18:18,020 It just had B on the end and A on the end. 336 00:18:18,020 --> 00:18:19,020 You got what? 337 00:18:19,020 --> 00:18:21,900 A positive and B negative. 338 00:18:21,900 --> 00:18:26,340 Gee, I wonder which one those are without even referencing what A and B are. 339 00:18:26,340 --> 00:18:27,340 Isn't it? 340 00:18:27,340 --> 00:18:31,540 It's amazing when you look at this from the perspective, because remember, a lot of us, 341 00:18:31,540 --> 00:18:36,300 I would say most of us educators, we're technicians out in the field, many of which never worked 342 00:18:36,300 --> 00:18:38,140 on communicating systems. 343 00:18:38,140 --> 00:18:41,900 And so sometimes we're a little leery to bring communicating systems into the classroom because 344 00:18:41,900 --> 00:18:43,500 we don't completely understand them. 345 00:18:43,500 --> 00:18:47,020 Well, you get done with this class, you're going to go, that's all? 346 00:18:47,020 --> 00:18:51,860 Bring it on because I've got this, this, this all makes, everyone's really doing this and 347 00:18:51,860 --> 00:18:53,420 they're just saying it's different. 348 00:18:53,420 --> 00:18:54,420 Yeah. 349 00:18:54,420 --> 00:18:55,420 Yeah, pretty much. 350 00:18:55,420 --> 00:18:58,860 It's just a different, it just matters a different protocol, a different language. 351 00:18:58,860 --> 00:18:59,860 Exactly. 352 00:18:59,860 --> 00:19:06,260 It's being delivered to one piece or one controller, the outdoor, the unitary devices in a, in 353 00:19:06,260 --> 00:19:08,460 the same way, just a different language. 354 00:19:08,460 --> 00:19:09,460 Different language. 355 00:19:09,460 --> 00:19:14,540 Now I will say that I cannot speak for the bias voltage between one and two for the rest 356 00:19:14,540 --> 00:19:16,020 of the manufacturers. 357 00:19:16,020 --> 00:19:21,060 I know the climate talk pretty well and there's a lot of training material for that. 358 00:19:21,060 --> 00:19:25,260 So if there's anyone out there that has tested the bias voltages and know more about the 359 00:19:25,260 --> 00:19:28,820 bias voltages between different manufacturers, I'd love for you to hop on because that's 360 00:19:28,820 --> 00:19:32,460 a piece that not every manufacturer likes for you. 361 00:19:32,460 --> 00:19:33,460 To disclose either. 362 00:19:33,460 --> 00:19:34,500 To disclose, right. 363 00:19:34,500 --> 00:19:38,860 So I'm curious myself, but I mean, I've got my own ideas. 364 00:19:38,860 --> 00:19:40,740 So let's talk about how do you check these? 365 00:19:40,740 --> 00:19:41,740 Okay. 366 00:19:41,740 --> 00:19:46,620 So if we're talking about this particular network, so with this particular one, so if, 367 00:19:46,620 --> 00:19:50,420 if you think there's a communication issue, you're being told in the service manual to 368 00:19:50,420 --> 00:19:54,860 isolate A plus and B negative, right. 369 00:19:54,860 --> 00:19:59,540 And then measure the A plus and B terminals to common. 370 00:19:59,540 --> 00:20:05,220 Back to our reference point of common once again. 371 00:20:05,220 --> 00:20:09,420 And so this particular one has done a little bit different because they are utilizing voltages 372 00:20:09,420 --> 00:20:11,100 at each different part. 373 00:20:11,100 --> 00:20:15,160 And so they're saying, all right, let's just make sure that we're going from A to C isolated 374 00:20:15,160 --> 00:20:19,540 that we're going to have 3.2 volts and B to C is going to be less than a volt DC. 375 00:20:19,540 --> 00:20:20,540 Right. 376 00:20:20,540 --> 00:20:26,900 Really communicating positive from A to common at the indoor unit, we're checking A to common. 377 00:20:26,900 --> 00:20:31,140 We're checking B to common outdoor unit, A to common and B to common. 378 00:20:31,140 --> 00:20:35,580 And if you look at it, it's simply stating we've got a three volt DC power supply on 379 00:20:35,580 --> 00:20:38,760 these instead of a five volt DC power supply. 380 00:20:38,760 --> 00:20:40,580 And each manufacturer will be different. 381 00:20:40,580 --> 00:20:41,580 That's right. 382 00:20:41,580 --> 00:20:43,540 But goes back to that protocol language. 383 00:20:43,540 --> 00:20:44,540 It does. 384 00:20:44,540 --> 00:20:45,540 How do we check them? 385 00:20:45,540 --> 00:20:48,400 We simply open up the service manual and verify the voltage. 386 00:20:48,400 --> 00:20:52,460 You're going to find that some of these look really similar to each other. 387 00:20:52,460 --> 00:20:54,460 All right. 388 00:20:54,460 --> 00:20:56,540 So let's take a look at the infinity line. 389 00:20:56,540 --> 00:20:57,740 Most people are comfortable with infinity. 390 00:20:57,740 --> 00:21:01,140 You know, have a lot of people go, man, I really struggle with my communication line, 391 00:21:01,140 --> 00:21:02,380 especially if I get into zone systems. 392 00:21:02,380 --> 00:21:05,580 I'm like, well, let's just understand what we're doing on that zone system. 393 00:21:05,580 --> 00:21:08,100 Let's look at the entire system. 394 00:21:08,100 --> 00:21:09,100 What is infinity? 395 00:21:09,100 --> 00:21:11,500 It's four wires. 396 00:21:11,500 --> 00:21:12,720 Okay. 397 00:21:12,720 --> 00:21:22,700 And they are going to be labeled A, B, C and D. Now, if I were just a guessing guy, Todd, 398 00:21:22,700 --> 00:21:27,140 and I didn't, if I didn't go into the next slide, we're getting ready to look at, I might 399 00:21:27,140 --> 00:21:30,700 look at that and go, hmm, I got two wires going to my outdoor unit. 400 00:21:30,700 --> 00:21:32,500 I wonder what's on those two wires. 401 00:21:32,500 --> 00:21:35,780 Gee, I wonder. 402 00:21:35,780 --> 00:21:39,220 If it's the outdoor unit, it probably has its own, if it's communicating, it probably 403 00:21:39,220 --> 00:21:40,700 has its own transformer. 404 00:21:40,700 --> 00:21:44,460 Well, we aren't going to have, we usually don't have common hooked up. 405 00:21:44,460 --> 00:21:45,460 Right. 406 00:21:45,460 --> 00:21:46,460 Rarely ever. 407 00:21:46,460 --> 00:21:48,340 Unless you have a problem like you described. 408 00:21:48,340 --> 00:21:49,340 Exactly. 409 00:21:49,340 --> 00:21:50,340 Not going to have R hooked up. 410 00:21:50,340 --> 00:21:51,340 Right. 411 00:21:51,340 --> 00:21:55,620 So, if you have two wires there, and this takes green and yellow, one's got to be a 412 00:21:55,620 --> 00:21:58,300 positive DC and one's got to be a negative DC. 413 00:21:58,300 --> 00:21:59,300 All right. 414 00:21:59,300 --> 00:22:03,660 And then from my indoor unit to my thermostat or whatever I've got, I've got four wires. 415 00:22:03,660 --> 00:22:06,380 So let's take a look and see what those actually are. 416 00:22:06,380 --> 00:22:08,340 Well, looky there. 417 00:22:08,340 --> 00:22:12,900 So you got to break it down a little bit different from this manufacturer, but let's start at 418 00:22:12,900 --> 00:22:13,900 the very bottom. 419 00:22:13,900 --> 00:22:14,900 Either one. 420 00:22:14,900 --> 00:22:16,740 Let's just start at the top. 421 00:22:16,740 --> 00:22:23,220 And if we go from C to D, well, that looks awfully hot to me. 422 00:22:23,220 --> 00:22:24,340 That looks awfully familiar. 423 00:22:24,340 --> 00:22:26,940 That looks like an R to me. 424 00:22:26,940 --> 00:22:28,780 And they're all in reference. 425 00:22:28,780 --> 00:22:34,860 A, B, and C are in reference to C. A and B are both in reference to C, and D is in reference 426 00:22:34,860 --> 00:22:37,940 to C. So C must be common. 427 00:22:37,940 --> 00:22:43,100 So C is actually common, and D is actually 24 volts hot. 428 00:22:43,100 --> 00:22:47,700 And A to common, I'm going to have a three volt DC signal. 429 00:22:47,700 --> 00:22:51,180 And B to common, I'm going to have that 0.1, 0.3 volts DC. 430 00:22:51,180 --> 00:22:56,620 And of course, that little tilde is approximately three volts, approximately 0.01 volts. 431 00:22:56,620 --> 00:22:57,620 Exactly. 432 00:22:57,620 --> 00:23:00,180 And they are showing you to reference it a little bit differently. 433 00:23:00,180 --> 00:23:04,700 They're saying, hey, on the top reading with a board power applied, so I've got power going 434 00:23:04,700 --> 00:23:06,820 to the board, but no connected. 435 00:23:06,820 --> 00:23:11,140 This is the voltage you're going to see coming from the indoor unit. 436 00:23:11,140 --> 00:23:16,260 And then once I connect things, I'm going to see a change in voltage. 437 00:23:16,260 --> 00:23:21,580 And I'm going to see it moving between 2.5 and 3.9 volts DC. 438 00:23:21,580 --> 00:23:28,620 And so that is how you test that communicating network on our Infinity system. 439 00:23:28,620 --> 00:23:29,620 Let's just keep going. 440 00:23:29,620 --> 00:23:32,980 And anything outside those parameters, we got a problem. 441 00:23:32,980 --> 00:23:34,460 You got a problem between them. 442 00:23:34,460 --> 00:23:38,220 And it's usually, typically, you're wiring. 443 00:23:38,220 --> 00:23:39,220 Absolutely. 444 00:23:39,220 --> 00:23:40,220 It's usually not the controller. 445 00:23:40,220 --> 00:23:41,220 It's usually not the board. 446 00:23:41,220 --> 00:23:42,220 Yep. 447 00:23:42,220 --> 00:23:46,580 The only thing that I don't see in many of these, except for the very first one, is measured 448 00:23:46,580 --> 00:23:50,700 between A and B, which that would be our bias voltage. 449 00:23:50,700 --> 00:23:54,100 So I need to round up some is what I need to do. 450 00:23:54,100 --> 00:23:58,380 I need to get in some of my friends' labs and go, all right, what's the bias voltage 451 00:23:58,380 --> 00:24:00,380 on every one of these manufacturers? 452 00:24:00,380 --> 00:24:04,340 Because I've got a feeling they all operate under the same principle that if I have a 453 00:24:04,340 --> 00:24:09,860 certain bias, then if it's below this, I can't communicate well. 454 00:24:09,860 --> 00:24:10,860 So what are we looking at here? 455 00:24:10,860 --> 00:24:11,860 All right. 456 00:24:11,860 --> 00:24:14,300 Let's take a look at Linux iComfort system, right? 457 00:24:14,300 --> 00:24:15,300 Woo. 458 00:24:15,300 --> 00:24:16,300 I like those. 459 00:24:16,300 --> 00:24:17,300 Good pieces of equipment. 460 00:24:17,300 --> 00:24:18,300 What do they do? 461 00:24:18,300 --> 00:24:19,300 Wow. 462 00:24:19,300 --> 00:24:21,540 They get kind of crazy with the wiring diagrams. 463 00:24:21,540 --> 00:24:25,220 Let's stare at this for a minute and go, man, am I really going to work on this thing? 464 00:24:25,220 --> 00:24:26,220 Yeah. 465 00:24:26,220 --> 00:24:27,220 Yeah, you are. 466 00:24:27,220 --> 00:24:29,340 Let's break it down a little bit simpler. 467 00:24:29,340 --> 00:24:32,220 We can look at this one or we can look at the one after it from another piece. 468 00:24:32,220 --> 00:24:35,980 And it sometimes makes it a little easier to understand what those four are doing. 469 00:24:35,980 --> 00:24:36,980 All right. 470 00:24:36,980 --> 00:24:38,260 Let's start at the indoor unit, Todd. 471 00:24:38,260 --> 00:24:39,260 All right. 472 00:24:39,260 --> 00:24:40,260 Let's start at the indoor unit. 473 00:24:40,260 --> 00:24:45,220 And interesting that everything is tied back to the indoor unit on these unitary. 474 00:24:45,220 --> 00:24:46,220 Yeah. 475 00:24:46,220 --> 00:24:49,980 It'll be completely the opposite when we get to the duckless. 476 00:24:49,980 --> 00:24:50,980 The duckless. 477 00:24:50,980 --> 00:24:51,980 Absolutely. 478 00:24:51,980 --> 00:24:56,340 But all of our unitary, our primary DC voltage is coming from that indoor control board. 479 00:24:56,340 --> 00:24:58,500 So let's look at this indoor control board. 480 00:24:58,500 --> 00:25:01,740 This one's using a smart hub because it's connecting another component to it. 481 00:25:01,740 --> 00:25:04,020 But we can even talk about the smart hub if we needed to. 482 00:25:04,020 --> 00:25:06,620 But what do you see at that indoor unit? 483 00:25:06,620 --> 00:25:09,660 What are you seeing wires? 484 00:25:09,660 --> 00:25:10,660 Yeah, I do. 485 00:25:10,660 --> 00:25:11,660 I got an R, a forget. 486 00:25:11,660 --> 00:25:13,660 I don't see it at a common. 487 00:25:13,660 --> 00:25:16,980 So the are in common, I imagine, be 24 volts and the one in the two in the middle. 488 00:25:16,980 --> 00:25:17,980 I see a negative and a positive. 489 00:25:17,980 --> 00:25:19,340 I can't read what they are. 490 00:25:19,340 --> 00:25:22,900 I they call it I but it's I I negative. 491 00:25:22,900 --> 00:25:23,900 So there you go. 492 00:25:23,900 --> 00:25:25,540 And I wonder which what those are. 493 00:25:25,540 --> 00:25:26,540 Right. 494 00:25:26,540 --> 00:25:32,820 So as elusive as these may seem, they're really not. 495 00:25:32,820 --> 00:25:40,220 One difference that we do see with this particular brand is we may not be using that that 24 496 00:25:40,220 --> 00:25:42,100 volt AC all the time. 497 00:25:42,100 --> 00:25:45,100 We might have a 12 volt DC. 498 00:25:45,100 --> 00:25:52,060 So if we hop over to the smart hub up here, when we get to our smart hub, we originated 499 00:25:52,060 --> 00:25:57,140 with 24 volts AC and are to communicating when we go out of our smart hub, we're actually 500 00:25:57,140 --> 00:26:07,180 going to now start using a DC voltage to work with, but we still have a positive. 501 00:26:07,180 --> 00:26:10,020 So let's jump over to some of our ICP products. 502 00:26:10,020 --> 00:26:11,020 Right. 503 00:26:11,020 --> 00:26:14,580 I wonder if this is going to be similar to carrier kind of looks a little similar. 504 00:26:14,580 --> 00:26:16,980 Now they've had two different generations to though. 505 00:26:16,980 --> 00:26:17,980 So you're going to see observer. 506 00:26:17,980 --> 00:26:18,980 You want to see Ion. 507 00:26:18,980 --> 00:26:22,620 And I'm going to show you a couple of different wiring diagrams, but let's break it down. 508 00:26:22,620 --> 00:26:23,620 All right. 509 00:26:23,620 --> 00:26:24,620 Let's put it into perspective. 510 00:26:24,620 --> 00:26:25,620 Looks pretty similar. 511 00:26:25,620 --> 00:26:27,500 What do you see there, Todd? 512 00:26:27,500 --> 00:26:30,220 D X positive D or DX negative. 513 00:26:30,220 --> 00:26:32,420 I wonder which ones are data. 514 00:26:32,420 --> 00:26:33,420 Right. 515 00:26:33,420 --> 00:26:37,380 And our indoor unit, it might call them ABC and D, but then all we've got to do is we've 516 00:26:37,380 --> 00:26:38,380 got to look at the wall controller. 517 00:26:38,380 --> 00:26:42,980 We look at the outdoor unit and we see exactly what those things are. 518 00:26:42,980 --> 00:26:52,740 So I see 24 volt hot between common and D or R. And then I see a negative communicating 519 00:26:52,740 --> 00:26:58,660 signal on B or DX native and a positive on a looks pretty dang familiar. 520 00:26:58,660 --> 00:27:01,020 If we can check this one. 521 00:27:01,020 --> 00:27:03,020 Well, why not? 522 00:27:03,020 --> 00:27:08,860 So doesn't it look similar to go their way? 523 00:27:08,860 --> 00:27:09,860 We named her. 524 00:27:09,860 --> 00:27:10,860 I wonder why. 525 00:27:10,860 --> 00:27:13,900 I well, we're just saying that they're they're training material on their slides. 526 00:27:13,900 --> 00:27:14,900 Look similar. 527 00:27:14,900 --> 00:27:17,900 That's all we'll say. 528 00:27:17,900 --> 00:27:19,780 So, yes. 529 00:27:19,780 --> 00:27:22,860 DX negative common that that is common. 530 00:27:22,860 --> 00:27:25,220 Commodore 24 volts. 531 00:27:25,220 --> 00:27:27,860 So we're just on three volt DC. 532 00:27:27,860 --> 00:27:30,180 We're going to see three volts on both of them. 533 00:27:30,180 --> 00:27:35,020 And if we don't, we've got to disconnect and we've got to start seeing where we're losing 534 00:27:35,020 --> 00:27:36,020 it. 535 00:27:36,020 --> 00:27:40,300 So the best way on any communicating system, disconnected control wires start at that indoor 536 00:27:40,300 --> 00:27:46,420 unit, verify you got good voltage coming from it and then start adding them one at a time. 537 00:27:46,420 --> 00:27:47,740 Let's look at comfort sink. 538 00:27:47,740 --> 00:27:48,740 All right. 539 00:27:48,740 --> 00:27:56,140 I think this might look similar to Linux. 540 00:27:56,140 --> 00:27:57,620 I'm seeing common. 541 00:27:57,620 --> 00:28:02,060 I'm seeing our I'm seeing positive and I'm seeing negative again. 542 00:28:02,060 --> 00:28:08,340 And look at our pseudo shulid cable with our typical 18 gauge whatever. 543 00:28:08,340 --> 00:28:09,340 Yeah. 544 00:28:09,340 --> 00:28:13,060 So if it's a non communicating wire, we got communicating existing wires. 545 00:28:13,060 --> 00:28:15,860 Oh, we're going to tie those together. 546 00:28:15,860 --> 00:28:17,380 And then we're going to check our voltages. 547 00:28:17,380 --> 00:28:18,380 Right. 548 00:28:18,380 --> 00:28:21,540 So it's the service instructions are a tad bit different. 549 00:28:21,540 --> 00:28:23,340 They're a bit different. 550 00:28:23,340 --> 00:28:27,620 But you know, this is because of the communicating platform that they're using. 551 00:28:27,620 --> 00:28:32,220 What we're checking changes how we check it never actually changes. 552 00:28:32,220 --> 00:28:35,220 So we know that it's a five volt DC system. 553 00:28:35,220 --> 00:28:36,220 Right. 554 00:28:36,220 --> 00:28:39,600 So we can now check the pin one to pin two. 555 00:28:39,600 --> 00:28:43,260 We should have four point five to five point five volts DC when it's not communicating. 556 00:28:43,260 --> 00:28:47,940 So when it's sitting there idle pin three to pin two should read four point five to 557 00:28:47,940 --> 00:28:50,380 five point five when it's not communicating. 558 00:28:50,380 --> 00:28:54,700 And then pin two to pin four should read four point five to five point five volts DC. 559 00:28:54,700 --> 00:28:58,860 Geez, they all look like four and a half to five and a half. 560 00:28:58,860 --> 00:28:59,860 I'm telling you. 561 00:28:59,860 --> 00:29:01,740 That's why I like doing this class. 562 00:29:01,740 --> 00:29:06,700 Because when you go through it all and you go, oh, really? 563 00:29:06,700 --> 00:29:10,100 Oh, I'll make sense now. 564 00:29:10,100 --> 00:29:14,580 When one last thing I'll put in there is that communication systems are here to stay. 565 00:29:14,580 --> 00:29:15,580 They are. 566 00:29:15,580 --> 00:29:16,580 And we're going to be not going. 567 00:29:16,580 --> 00:29:18,380 But we're going to be talking about it more and more and more. 568 00:29:18,380 --> 00:29:26,140 And hopefully we'll end up persuading a common common language, common common protocol. 569 00:29:26,140 --> 00:29:27,460 All right. 570 00:29:27,460 --> 00:29:31,180 So once again, always fun hanging out with you my friend. 571 00:29:31,180 --> 00:29:35,540 I just I love these conversations and know it's just about bringing quality education 572 00:29:35,540 --> 00:29:36,540 to the industry. 573 00:29:36,540 --> 00:29:37,680 So yeah. 574 00:29:37,680 --> 00:29:40,580 And one final as we say goodbye. 575 00:29:40,580 --> 00:29:43,580 Happy birthday to my best friend Clifton. 576 00:29:43,580 --> 00:29:50,540 I know I was I had people say what what what kind of day and I was like, I don't want to 577 00:29:50,540 --> 00:29:51,540 do this the whole time. 578 00:29:51,540 --> 00:29:56,060 But how come you don't have your your your get up from from from HR? 579 00:29:56,060 --> 00:29:57,500 We just picked it up from the dry cleaner. 580 00:29:57,500 --> 00:29:59,820 So here's where you go. 581 00:29:59,820 --> 00:30:00,820 All right, everyone. 582 00:30:00,820 --> 00:30:02,620 Thank you so much for joining us once again. 583 00:30:02,620 --> 00:30:07,900 We'll see you all next week on Did You Know the Esco H5 show. 584 00:30:07,900 --> 00:30:08,900 Bye. 585 00:30:08,900 --> 00:30:14,740 Bye now.