1 00:00:00,000 --> 00:00:05,900 Welcome back to Teaching the Unteachables where we dive into teaching and learning 2 00:00:05,900 --> 00:00:11,620 methodologies for professionals like you. This episode brought to you by Regal 3 00:00:11,620 --> 00:00:16,620 Rexnord Gentec Motors, the leading brand in electronically commutated motor 4 00:00:16,620 --> 00:00:22,460 technology. Learn more at regalrexnord.com. 5 00:00:22,460 --> 00:00:26,860 All right well hello once again thank you all for joining Did You Know? Last 6 00:00:26,860 --> 00:00:30,320 month we had the opportunity to hang out with Chris Mohally from Regal Rexnord. 7 00:00:30,320 --> 00:00:34,720 Chris how you doing today again? Doing great, happy holidays. Absolutely getting 8 00:00:34,720 --> 00:00:40,600 real close, getting excited, getting busy, ready for a break. Ready for the break. 9 00:00:40,600 --> 00:00:46,800 Oh my goodness, absolutely. So we spent a lot of time talking about ECM constant 10 00:00:46,800 --> 00:00:51,640 airflow, our true variable speed ECM motors, and they are quickly gaining 11 00:00:51,640 --> 00:00:55,920 popularity in the industry. But they're not the most popular ECM motor out there, 12 00:00:55,920 --> 00:00:59,920 at least what I see out in the field. So today we're going to be spending some 13 00:00:59,920 --> 00:01:07,240 time with the Constant Airflows cousin, Constant Torque. Very similar but boy 14 00:01:07,240 --> 00:01:11,280 they have some different command controls. So Chris thank you so much for 15 00:01:11,280 --> 00:01:15,960 joining us and for those that missed last month's show it is out there. We got 16 00:01:15,960 --> 00:01:20,160 the live version of it plus we've got the finished edited version as well on 17 00:01:20,160 --> 00:01:24,160 our YouTube channel s2institute HVAC excellence so make sure to go check that 18 00:01:24,160 --> 00:01:28,400 out if you missed that one and let's go ahead and dive on into this thing and 19 00:01:28,400 --> 00:01:34,720 let's talk a little bit about Constant Torque ECM motors. Sounds good. We'll 20 00:01:34,720 --> 00:01:39,720 start right in with what you said there Constant Torque ECM and their 21 00:01:39,720 --> 00:01:44,040 applications. So last time we talked about Constant Airflow motors and 22 00:01:44,040 --> 00:01:49,280 they're more applicable to the premium level HVAC systems. Constant Torque 23 00:01:49,280 --> 00:01:54,360 motors are more applicable to the mid-tier and lower tier systems but as 24 00:01:54,360 --> 00:01:58,700 you're going to learn there's some characteristics that cross over which I 25 00:01:58,700 --> 00:02:03,400 think the audience might find kind of interesting. These are multi-tap motors 26 00:02:03,400 --> 00:02:07,660 majority of them are multi-tap motors. I have to remember to change my 27 00:02:07,660 --> 00:02:11,200 teaching habits because the motors have changed in the last five years or so. 28 00:02:11,200 --> 00:02:15,480 Exactly. The majority of them are multi-tap motors very similar to a PSC 29 00:02:15,480 --> 00:02:19,160 motor where if you want the motor to operate more or less airflow you simply 30 00:02:19,160 --> 00:02:23,840 move to a higher or a lower tap value and they're also Constant Torque as you 31 00:02:23,840 --> 00:02:29,080 already mentioned and as we did last time we will delve into what Constant 32 00:02:29,080 --> 00:02:34,000 Torque really means and especially what it means to airflow. These motors do 33 00:02:34,000 --> 00:02:40,240 perform very similar to a PSC motor but we'll show exactly how similar and what 34 00:02:40,240 --> 00:02:45,360 that means as far as making airflow selections and diagnosing airflow 35 00:02:45,360 --> 00:02:51,120 performance issues. Yeah absolutely. So what does multi-tap mean? I'm pretty sure 36 00:02:51,120 --> 00:02:56,240 it's you know what I've said already. Yeah. Fairly plain but you know just just to make sure. 37 00:02:56,240 --> 00:03:00,880 Manual selections that's really what we're talking about. It really is so 38 00:03:00,880 --> 00:03:05,560 you know really the main difference between a Constant Torque ECM and a PSC 39 00:03:05,560 --> 00:03:11,040 motor is they both have speed taps and it's funny because we we we call them 40 00:03:11,040 --> 00:03:15,240 speed taps but even on a PSC motor they were never speed taps you know you 41 00:03:15,240 --> 00:03:19,200 when a PSC motor when you want to make it multi-speed you tap the winding in 42 00:03:19,200 --> 00:03:23,480 multiple places right and each tap gives you a different amount of torque each 43 00:03:23,480 --> 00:03:26,760 different amount of torque is going to give you a different amount of speed 44 00:03:26,760 --> 00:03:31,920 based on the load. Probably went a little too deep there but so these things. No, makes sense to me. 45 00:03:31,920 --> 00:03:38,720 We call these speed taps but really each tap has a programmed level of torque and 46 00:03:38,720 --> 00:03:43,800 that level could be either a percent of maximum torque or an actual ounce feet 47 00:03:43,800 --> 00:03:48,200 of torque that you know again if I go to a higher torque level I'm going to get 48 00:03:48,200 --> 00:03:52,640 more airflow a lower torque level I'm going to get less airflow but I'll 49 00:03:52,640 --> 00:03:56,080 default and go back to what the industry is comfortable with and we'll just call 50 00:03:56,080 --> 00:03:59,720 them speed taps. And they do they look very similar I mean when we're talking 51 00:03:59,720 --> 00:04:04,120 about PSC motors we had typically wires that were our selection but on some of 52 00:04:04,120 --> 00:04:09,240 our manufacturers we actually had plugs or sockets on the motor that was the tap 53 00:04:09,240 --> 00:04:14,200 selection. Yeah so when we look at our ECM constant torques now we're going to 54 00:04:14,200 --> 00:04:18,960 see a similar type of plug and so a lot of people are familiar with 55 00:04:18,960 --> 00:04:24,360 that particular look you know when we're getting to the actual socket we're gonna 56 00:04:24,360 --> 00:04:29,400 go oh wow all right that's starting to look a little bit familiar to us right 57 00:04:29,400 --> 00:04:33,640 well what do they mean you know what are we doing with each one of these taps? So 58 00:04:33,640 --> 00:04:37,800 the main difference here again being an ECM is we provide line voltage to the 59 00:04:37,800 --> 00:04:44,000 motor continuously you've got LGN line ground neutral the N is stamped on all 60 00:04:44,000 --> 00:04:50,360 of our plugs whether it's a 115 volt 230 volt 277 or 460 volt it's always 61 00:04:50,360 --> 00:04:55,920 stamped as N so the N changes meaning whether you're in a 115 volt motor it is 62 00:04:55,920 --> 00:05:01,120 actually neutral a 230 volt motor it's going to be L2 and so on and then the C 63 00:05:01,120 --> 00:05:05,640 of course is common so like the constant airflow motors we discussed last time 64 00:05:05,640 --> 00:05:10,360 around this motor is powered continuously with line voltage and it is 65 00:05:10,360 --> 00:05:15,880 the low voltage in this case 24 volts AC that actually energizes the speed taps 66 00:05:15,880 --> 00:05:20,340 tells the motor not only when to turn on but the tap that's energized tells the 67 00:05:20,340 --> 00:05:24,920 motor which torque level to operate at so the only other thing that I do want 68 00:05:24,920 --> 00:05:28,320 to cover make sure I cover at least once I'm sure I'll say it again because I 69 00:05:28,320 --> 00:05:33,960 often repeat myself is on the OEM motors you know these speed taps are programmed 70 00:05:33,960 --> 00:05:38,080 so the manufacturer of the appliance gets to program the torque value that 71 00:05:38,080 --> 00:05:42,080 goes into each one of those taps and that's where as we discussed later you 72 00:05:42,080 --> 00:05:45,940 know these these motors look very simple at the onset but then they can get a 73 00:05:45,940 --> 00:05:48,960 little bit more complex when you understand that every OEM can program 74 00:05:48,960 --> 00:05:53,440 them differently so they you know so tap one may not always be low speed and 75 00:05:53,440 --> 00:05:57,680 yeah tap five may not always be high speed as just as an example yeah now 76 00:05:57,680 --> 00:06:01,160 I've ran into that before where they were you know opposing actually had some 77 00:06:01,160 --> 00:06:04,960 that came from a manufacturer one time as a warranty replacement motor and I 78 00:06:04,960 --> 00:06:07,920 got some calls from the field hey these are not running at the correct speed 79 00:06:07,920 --> 00:06:11,560 then what do you mean right like low is high and high is low and I cool that 80 00:06:11,560 --> 00:06:15,960 could be an issue yep exactly so you know the best recommendation I can give 81 00:06:15,960 --> 00:06:19,920 technicians is to really treat these motors just like you did a PSC motor go 82 00:06:19,920 --> 00:06:24,080 go to the door schematic or the unit manual where you'll find either the color 83 00:06:24,080 --> 00:06:29,640 chart like we did for PSC motors right or in this case the number chart that 84 00:06:29,640 --> 00:06:33,960 tells you what you know each number represents as far as high medium low 85 00:06:33,960 --> 00:06:39,200 speed or other some manufacturers will actually label them as the heat tap or 86 00:06:39,200 --> 00:06:42,920 the cool tap or you know electric strip heat or something like that and of 87 00:06:42,920 --> 00:06:47,880 course we'll have to confer with those manuals for our airflow because it's a 88 00:06:47,880 --> 00:06:52,200 constant torque motor it does not maintain airflow like the constant air 89 00:06:52,200 --> 00:06:55,960 flow motor and of course we'll get into that in a little bit so let's let's dive 90 00:06:55,960 --> 00:07:01,720 right into you know what makes the motor so different so yeah almost all constant 91 00:07:01,720 --> 00:07:06,720 torque motors built by us and our competitors use this same and I like to 92 00:07:06,720 --> 00:07:13,360 use the word standard nine terminal block okay CLGN 12345 it comes up to nine you 93 00:07:13,360 --> 00:07:18,320 got a you got a blank in the upper corner next to N so I call it a standard 94 00:07:18,320 --> 00:07:23,640 nine terminal block and so it us in the competition build our motors with the 95 00:07:23,640 --> 00:07:29,000 same block almost all of them are using 24 volts AC to energize the speed taps 96 00:07:29,000 --> 00:07:33,720 so what makes them what makes them different if you look at the diagram 97 00:07:33,720 --> 00:07:37,200 that's on the screen we see and I'm using examples of how different 98 00:07:37,200 --> 00:07:42,200 manufacturers programmed the motors this one programs the motor with tap one as 99 00:07:42,200 --> 00:07:47,360 low speed and tap five is high speed just like with a PSC motor if I needed my IC 100 00:07:47,360 --> 00:07:52,480 heat is connected to tap three so if I wanted to increase my heating airflow I 101 00:07:52,480 --> 00:07:57,360 would move the heat tap from three to four and I would get more airflow very 102 00:07:57,360 --> 00:08:02,360 simple so I'll give you another example and if you didn't pay attention I'll 103 00:08:02,360 --> 00:08:06,640 tell you what changed here like a where's Waldo tap three didn't change 104 00:08:06,640 --> 00:08:11,120 yeah but but everything else did tap five is now low speed and tap one is now 105 00:08:11,120 --> 00:08:15,240 high speed and to your point if a technician is not paying attention to 106 00:08:15,240 --> 00:08:19,760 the speed taps they may move them in the wrong direction which you know obviously 107 00:08:19,760 --> 00:08:22,880 you can probably figure out if your amperage goes down and your airflow 108 00:08:22,880 --> 00:08:26,480 goes down I probably went in the wrong wrong direction you can go the other way 109 00:08:26,480 --> 00:08:29,980 but you know it's just as easy to reference the schematic and know what 110 00:08:29,980 --> 00:08:34,560 you're talking about when you're working on the unit right this next one is going 111 00:08:34,560 --> 00:08:39,920 to give you even more reason to focus on that unit schematic so and this is this 112 00:08:39,920 --> 00:08:46,200 is actually fairly common in single stage package units that you constant 113 00:08:46,200 --> 00:08:49,640 torque motors because of saying and especially if they're all electric so an 114 00:08:49,640 --> 00:08:55,280 all-electric single stage package unit might use one speed for AC and electric 115 00:08:55,280 --> 00:09:01,640 strip heat pump AC heat pump heat and heat pump or and electric strip you know 116 00:09:01,640 --> 00:09:05,760 I may use one speed for everything and if it does you know it's comes factory 117 00:09:05,760 --> 00:09:09,440 wired to that one speed now there's actually a high speed that I can choose 118 00:09:09,440 --> 00:09:15,080 here but the the the key to this diagram is there are three taps on this motor 119 00:09:15,080 --> 00:09:20,120 that are not programmed they have no functionality so if I put 24 volts on 120 00:09:20,120 --> 00:09:25,120 tap three yeah the motor is not gonna run okay absolutely that makes sense so 121 00:09:25,120 --> 00:09:28,960 it depends on how it was programmed from the manufacturer no program no run 122 00:09:28,960 --> 00:09:34,000 absolutely so if I'm used to working on systems that look more like the previous 123 00:09:34,000 --> 00:09:38,980 one or you know preview either either one I might think that going up to tap 124 00:09:38,980 --> 00:09:43,480 three is gonna give me more airflow the motor shuts off and then I'm wondering 125 00:09:43,480 --> 00:09:47,000 well do I have a bad motor because I don't know enough about constant torque 126 00:09:47,000 --> 00:09:51,480 motor so this is really more probably more important for diagnostics but also 127 00:09:51,480 --> 00:09:54,760 important for that technique technician that shows up on the job they've got a 128 00:09:54,760 --> 00:10:00,320 frozen coil or a trip limit and they move to it inadvertently again package 129 00:10:00,320 --> 00:10:04,880 systems common split systems very uncommon to have unprogrammed taps but 130 00:10:04,880 --> 00:10:09,000 they inadvertently move to a tap that has no program in it motor shuts off I 131 00:10:09,000 --> 00:10:12,220 mean I myself if I didn't know better would think yeah something wrong with the 132 00:10:12,220 --> 00:10:16,280 motor that motor that would be the call that would come right right that's not 133 00:10:16,280 --> 00:10:20,480 working so that is a fantastic if we get anything from this entire program that 134 00:10:20,480 --> 00:10:24,960 is some super good information all right so here's another example and this is 135 00:10:24,960 --> 00:10:29,160 pretty common in air handlers from one manufacturer I'm not gonna say who the 136 00:10:29,160 --> 00:10:33,360 manufacturer is you see a low medium and high and you know if a manufacturer 137 00:10:33,360 --> 00:10:40,080 programs all five whether they program tap one is low or tap tap one is high you 138 00:10:40,080 --> 00:10:44,160 know tap three stays the same it's medium and you might start getting the 139 00:10:44,160 --> 00:10:47,080 mentality that well the middle of the motor is always going to be medium well 140 00:10:47,080 --> 00:10:51,520 that's not the case if you look at this particular handler where they did low 141 00:10:51,520 --> 00:10:55,160 medium and high and one two and three and then they put tap four as the 142 00:10:55,160 --> 00:11:01,800 dedicated electric strip tap and then see manual for tap five which my joke is in 143 00:11:01,800 --> 00:11:05,520 class so is always well that taps never gonna get used because the manual is 144 00:11:05,520 --> 00:11:08,040 never gonna be left yeah they actually open the manual to read this one and 145 00:11:08,040 --> 00:11:12,680 know what it is not picking on the technician that's currently on the job 146 00:11:12,680 --> 00:11:16,320 but not a lot of manuals stay on the job site exactly we're talking to the 147 00:11:16,320 --> 00:11:19,120 technicians that don't read manuals we're just encouraging them everybody 148 00:11:19,120 --> 00:11:22,960 else does and we're so glad that you do that so this is my cue to throw out the 149 00:11:22,960 --> 00:11:28,840 RTF and read the whole manual manual man those are some examples of the most 150 00:11:28,840 --> 00:11:36,000 widely format that constant torque motors are used in all the five taps 151 00:11:36,000 --> 00:11:42,720 are 24 volts AC activated the 24 volts AC turns the motor on it the tap 152 00:11:42,720 --> 00:11:47,280 selection determines how much torque it puts out the manufacturer that programmed 153 00:11:47,280 --> 00:11:51,920 the motor tells you if it's low medium high speed and away you go very very 154 00:11:51,920 --> 00:11:55,880 simple motor funny that you mentioned earlier you know PSC motors having 155 00:11:55,880 --> 00:12:00,800 terminal blocks in the past five ten years there's another competitor of mine 156 00:12:00,800 --> 00:12:05,040 that puts out a constant torque motor that looks like a PSC motor looks like a 157 00:12:05,040 --> 00:12:08,840 PSC replacement that's actually and I'm sorry for boys pointing that way I've 158 00:12:08,840 --> 00:12:15,680 got a no that's right that is actually a constant torque motor with just leads no 159 00:12:15,680 --> 00:12:21,240 plumber sure it has the same line ground neutral common still a square the same 160 00:12:21,240 --> 00:12:27,400 way as we assume five 24 volt wires for its speed tap so very very similar and 161 00:12:27,400 --> 00:12:32,960 also very widely used by by one manufacturer yeah we we put out a new 162 00:12:32,960 --> 00:12:38,520 motor recently called the n site motor where we changed the plugs which we went 163 00:12:38,520 --> 00:12:42,800 from the standard nine terminal plug to two different plugs and that was 164 00:12:42,800 --> 00:12:48,520 released primarily in 115 volt motors for the fossil fuel market so I'll talk 165 00:12:48,520 --> 00:12:53,080 about that in a little bit and then there's also two not now two 166 00:12:53,080 --> 00:12:57,720 communicated modes for constant torque motors one of those communicated modes 167 00:12:57,720 --> 00:13:02,160 is called PWM and one is called nine speed men technicians that you know are 168 00:13:02,160 --> 00:13:07,160 paying attention to the manuals or the schematics are probably already seeing 169 00:13:07,160 --> 00:13:10,960 these because they've been out for quite a while but I'm starting to get I do 170 00:13:10,960 --> 00:13:14,640 tech support for us so I'm starting to get more and more questions on these so 171 00:13:14,640 --> 00:13:19,240 I'm recognizing that the awareness has has grown on these motors you know 172 00:13:19,240 --> 00:13:23,520 manufacturers will take one of our motors a technology that's new to the 173 00:13:23,520 --> 00:13:26,900 industry they'll use it and it'll take technicians a while to actually notice 174 00:13:26,900 --> 00:13:30,400 that something something different in the appliance so yeah these have been 175 00:13:30,400 --> 00:13:34,160 around for a while and I'll talk about that when we get to them sure but that's 176 00:13:34,160 --> 00:13:38,800 that so that's the evolution of constant torque in one in one screen in the nutshell 177 00:13:38,800 --> 00:13:45,480 yeah again 90 plus percent of what's out there is that standard nine terminal 178 00:13:45,480 --> 00:13:51,480 with the 24 volt speed taps you've got some still using wires only and then 179 00:13:51,480 --> 00:13:55,480 you've got a couple of new with new terminals and PWM and nine speed so 180 00:13:55,480 --> 00:13:59,240 let's dive right into unless you had something to add one little question so 181 00:13:59,240 --> 00:14:04,040 yeah good question came in from Ray about you know so how do you get the 182 00:14:04,040 --> 00:14:07,560 correct programmed motor for your application one you go with the OEM 183 00:14:07,560 --> 00:14:12,720 motor or you go with a replacement motor and you verify what your CFM ratings 184 00:14:12,720 --> 00:14:16,800 were on your OEM motor and then you just look on your new motor I could be wrong 185 00:14:16,800 --> 00:14:22,160 but that's the experience that I've had with replacement motors how would regal 186 00:14:22,160 --> 00:14:27,380 how would gentech approach that one yep no you said it perfectly if you want the 187 00:14:27,380 --> 00:14:32,000 exact motor that came out you would have to go back to the manufacturer of that 188 00:14:32,000 --> 00:14:35,960 appliance order it from their authorized distributor by the model number of the 189 00:14:35,960 --> 00:14:40,040 appliance to get the program motor that came out of it but we do make generic 190 00:14:40,040 --> 00:14:44,160 motors that have all five taps programmed and it's very just like with 191 00:14:44,160 --> 00:14:50,720 replacing a OEM PSC motor with a generic PSC motor we can replace an OEM constant 192 00:14:50,720 --> 00:14:54,480 torque motor with a generic constant torque motor that has five speeds yeah 193 00:14:54,480 --> 00:14:58,840 and as you said I'm going to adjust my speeds until I get the correct airflow 194 00:14:58,840 --> 00:15:03,480 I you know so since it came up now and we'll it'll come up later again okay you 195 00:15:03,480 --> 00:15:07,480 know so I often get asked well I like to go back with OEM motors because then I 196 00:15:07,480 --> 00:15:11,160 know all I have to do is plug it in and I'm done I don't have to measure airflow 197 00:15:11,160 --> 00:15:16,240 because you know I put the OEM motor back in and my my contest for that is 198 00:15:16,240 --> 00:15:20,320 well what if the when the system was first installed what if no one ever 199 00:15:20,320 --> 00:15:24,560 measured airflow and adjusted the speeds to set it up properly on day one and 200 00:15:24,560 --> 00:15:29,560 then I get the well and the gosh-golly and the kick in the rocks and then I 201 00:15:29,560 --> 00:15:32,880 take it a step further and say now I'm really gonna blow your mind these are 202 00:15:32,880 --> 00:15:36,520 constant torque motors what if the static pressure today is different than 203 00:15:36,520 --> 00:15:41,300 the static pressure that was on day one even if it was set up properly if my 204 00:15:41,300 --> 00:15:44,440 static pressure is different today than my air flows different today and I still 205 00:15:44,440 --> 00:15:49,240 have to measure airflow so bottom line is you're gonna have to measure airflow 206 00:15:49,240 --> 00:15:52,760 whether you're putting the OEM motor back in or universal motor back in so 207 00:15:52,760 --> 00:15:57,600 really putting a universal motor back in isn't any more time than putting the OEM 208 00:15:57,600 --> 00:16:01,200 motor back in as long as you're following industry best practice yeah 209 00:16:01,200 --> 00:16:05,120 absolutely you know Jason Objute from our team says this all the time he says 210 00:16:05,120 --> 00:16:10,360 compressors don't die they're murdered and it's kind of the same way with ECM 211 00:16:10,360 --> 00:16:17,400 motors ECM motors don't typically die on their own it takes a lot to kill one but 212 00:16:17,400 --> 00:16:20,680 boy they can easily be murdered if they're not set up properly and they have 213 00:16:20,680 --> 00:16:24,640 too much static pressure and I would agree with that wholeheartedly yes sir so 214 00:16:24,640 --> 00:16:28,560 we'll we'll move on to the first variation if you will which is what we 215 00:16:28,560 --> 00:16:35,120 call the N-site motor again we launched this in 2019 with the 2019 fan 216 00:16:35,120 --> 00:16:39,520 efficiency regulation change 115 volt only but we you know it has two 217 00:16:39,520 --> 00:16:44,000 different plugs but if you look at it really closely it's the same motor as 218 00:16:44,000 --> 00:16:46,760 what you're used to it you know you got the nine terminal plug here and I'm 219 00:16:46,760 --> 00:16:51,000 marrying it up to the the three the three terminal plug for line voltage and 220 00:16:51,000 --> 00:16:55,040 the terminal plug for low voltage different configuration but yeah all 221 00:16:55,040 --> 00:16:58,920 there and and so you're probably only gonna see this if you're a technician 222 00:16:58,920 --> 00:17:03,560 in a fossil fuel market because we won't today we only make it in 115 volt 223 00:17:03,560 --> 00:17:08,200 applications yep and which means it's you know it's it's fairly new to the 224 00:17:08,200 --> 00:17:12,160 industry as well because it's only about three years old well almost four years 225 00:17:12,160 --> 00:17:16,240 old now right coming up on its birthday getting close there you go and this 226 00:17:16,240 --> 00:17:22,720 motor is by the way also capable of the 24 volt speed taps and also the PWM that 227 00:17:22,720 --> 00:17:30,480 we're gonna talk about in just in just a minute okay just a minute how about next 228 00:17:30,480 --> 00:17:37,680 when I'm leading in myself that's perfect PWM and if you're not familiar 229 00:17:37,680 --> 00:17:42,520 with with the acronym it stands for pulse width modulation and all it is is 230 00:17:42,520 --> 00:17:48,900 a it's a DC duty cycle if I speed up the duty cycle I'm asking the motor to 231 00:17:48,900 --> 00:17:53,400 operate at a higher torque value if I slow down the duty cycle I'm asking the 232 00:17:53,400 --> 00:18:00,120 motor to operate at a slower duty cycle so from a really fundamental standpoint 233 00:18:00,120 --> 00:18:04,200 if I if I think about the old Rhea stats you know I turn them I turn them up and 234 00:18:04,200 --> 00:18:07,520 the motor goes faster or the light gets brighter I turn them down and the motor 235 00:18:07,520 --> 00:18:14,400 gets slower go slower or the light gets dimmer with PWM the OEM board has full 236 00:18:14,400 --> 00:18:18,880 control over the motor whatever if they send a really low PWM signal they'll get 237 00:18:18,880 --> 00:18:22,880 a really low output out of the motor if they send the highest if you know 100% 238 00:18:22,880 --> 00:18:26,120 PWM signal they're gonna get maximum output of the motor so they they 239 00:18:26,120 --> 00:18:32,440 literally have infinite speed control the motor in PWM one thing that 240 00:18:32,440 --> 00:18:36,200 technicians can you know because again the manual is not often on the site the 241 00:18:36,200 --> 00:18:41,400 schematic may not specifically spell out this is PWM but one thing that 242 00:18:41,400 --> 00:18:45,480 technicians can note it will notice and when the constant torque motors used in 243 00:18:45,480 --> 00:18:51,520 PWM is tap one and terminal C or sorry terminal one and terminal C are going to 244 00:18:51,520 --> 00:18:55,480 be typically wired back to the board through a plug on all of our 24 volt 245 00:18:55,480 --> 00:19:00,560 motors there the motor terminals are going back to heat taps cool taps fan 246 00:19:00,560 --> 00:19:05,560 taps and if they're all wired you know park or unused taps but in the case of 247 00:19:05,560 --> 00:19:10,800 PWM what they're gonna find is it's not going back to a heat or cool a fan it's 248 00:19:10,800 --> 00:19:15,440 just it's going to be going back to a dedicated plug because you're not meant 249 00:19:15,440 --> 00:19:19,560 to adjust that tap you're meant to leave that alone I don't want to put 24 volts 250 00:19:19,560 --> 00:19:24,280 AC on that thing no and it's not going to be 24 volt AC the PWM signal is 251 00:19:24,280 --> 00:19:29,640 created with DC voltage so you'll have to again go into the manufacturer's 252 00:19:29,640 --> 00:19:34,920 manual to find out what that DC voltage is that relates to the PWM signal and I 253 00:19:34,920 --> 00:19:39,480 that signal determines the motor torque also determine at which determines the 254 00:19:39,480 --> 00:19:45,640 motors output so on a PWM controlled motor you're going to adjust your airflow 255 00:19:45,640 --> 00:19:50,160 with the dip switches so you're you know here so here we are we talked about 256 00:19:50,160 --> 00:19:53,920 constant airflow last time around and how everything is going to be set up 257 00:19:53,920 --> 00:19:58,000 with either dip switches or jumper pins or you know today's communicating 258 00:19:58,000 --> 00:20:01,080 thermostats I'm going to go in and I'm going to adjust the menu selection now 259 00:20:01,080 --> 00:20:04,760 here we are with constant torque motors and they're right back to that form of 260 00:20:04,760 --> 00:20:10,080 you know we use PWM communication and constant airflow as well and now we've 261 00:20:10,080 --> 00:20:15,480 got constant torque motors using PWM and being controlled by the dip switches on 262 00:20:15,480 --> 00:20:19,160 the board and you're going to be at the National HVACR education conference this 263 00:20:19,160 --> 00:20:25,280 year is that correct? I will I'll be teaching a class and I will have a booth there to answer any questions you have. 264 00:20:25,280 --> 00:20:30,440 And bring your books with you if you want to get the book signed by the 265 00:20:30,440 --> 00:20:34,040 author I would love that if you bring a book with you we'll make sure that we 266 00:20:34,040 --> 00:20:38,600 have a book signing of authors while we're there. So hopefully see you all at the 267 00:20:38,600 --> 00:20:42,760 National HVACR education conference and we hope that you all come back next week 268 00:20:42,760 --> 00:20:46,440 and hang out with us and next month we're going to be back again with Chris 269 00:20:46,440 --> 00:20:51,080 we're going to be talking about ECM condenser fan motors and the following 270 00:20:51,080 --> 00:20:55,080 month we're going to actually dive into some more characteristics of ECMs with 271 00:20:55,080 --> 00:20:58,600 airflow and maybe we'll tear some motors apart and dive a little deeper so you 272 00:20:58,600 --> 00:21:03,120 have some ECM questions get them prepared and Chris thank you so much for 273 00:21:03,120 --> 00:21:07,480 hanging out with us once again I enjoy diving into ECM motors and getting a 274 00:21:07,480 --> 00:21:11,240 better understanding of these newer technologies. Probably more fun than it 275 00:21:11,240 --> 00:21:17,480 should be. I love it when I get the calls I had so much fun on your show. 276 00:21:17,480 --> 00:21:24,400 You had fun talking about motors. I look forward to these shows. 277 00:21:24,400 --> 00:21:28,240 Alright well I think we're gonna call it a wrap we really appreciate everyone 278 00:21:28,240 --> 00:21:32,080 hanging in as long as you have I know it's a lot of information and we really 279 00:21:32,080 --> 00:21:35,920 enjoy hanging out with you and being a part of this HVACR building science 280 00:21:35,920 --> 00:21:42,720 community and Chris Mahaly we will see you in a few weeks. Sounds good I know it 281 00:21:42,720 --> 00:21:45,920 dates the show but happy holidays to you and your families everyone. Absolutely 282 00:21:45,920 --> 00:22:03,720 everyone thank you so much we'll see you later. Bye.