00:00:00.060 good morning guys John Wilson um I'm 00:00:04.03900:00:04.049 back again I just wanted to do a video 00:00:07.55000:00:07.560 on removal of plenty text changes or 00:00:11.29900:00:11.309 basically the unnecessary removal at 00:00:13.58000:00:13.590 plate heat exchangers and one of the 00:00:16.54000:00:16.550 major call-outs that you guys get is 00:00:20.33000:00:20.340 fluctuating hot water weather basically 00:00:22.67000:00:22.680 the waters were in hot and cold and your 00:00:25.00900:00:25.019 customer can be jumping into the shower 00:00:26.96000:00:26.970 like a rabbit's nose in and out in and 00:00:29.06000:00:29.070 out hot cold hot cold well obviously not 00:00:32.54000:00:32.550 teaching just soaked eggs in any shape 00:00:33.95000:00:33.960 or form but that's usually down to a 00:00:36.11000:00:36.120 block plate heat exchanger and that 00:00:37.88000:00:37.890 block block floaty texture is not a 00:00:39.65000:00:39.660 boiler fault it's deadly that's within 00:00:41.36000:00:41.370 the heat exchanger I've done some some 00:00:46.10000:00:46.110 drawings here a flaky test you know I've 00:00:48.20000:00:48.210 got a cook down heat exchanger for you 00:00:50.77900:00:50.789 guys just to look at now here we've got 00:00:54.20000:00:54.210 a plate heat exchanger of 82 degrees 00:00:56.45000:00:56.460 coming in and let's say for instance lo 00:01:00.26000:01:00.270 86 coming out really that can't happen 00:01:03.79900:01:03.809 but we'll address that slowly here we've 00:01:06.53000:01:06.540 got a heat exchanger would have 80 00:01:07.76000:01:07.770 degrees C coming in and 70 degrees C 00:01:10.28000:01:10.290 coming out here we've got 81 degrees C 00:01:13.42900:01:13.439 coming in and 45 degrees C coming out 00:01:16.71900:01:16.729 now these two differential clumps here 00:01:21.02000:01:21.030 guys 00:01:21.56000:01:21.570 these are clumped on to a piece of 00:01:23.63000:01:23.640 copper pipe so basically the 00:01:26.12000:01:26.130 differential between these two the the 00:01:28.37000:01:28.380 instrumentation that we carry is not 00:01:29.92900:01:29.939 accurate enough to get a readable for 00:01:31.76000:01:31.770 the differential because it's a pipe so 00:01:33.80000:01:33.810 the temperature is the same across that 00:01:35.48000:01:35.490 pipe when we're doing a differential 00:01:37.34000:01:37.350 reading when we come to a heat exchanger 00:01:40.16000:01:40.170 heat exchanger in its own definition it 00:01:42.67900:01:42.689 exchanges heat that's what it does okay 00:01:45.41000:01:45.420 now the reason for this Follette will 00:01:48.88900:01:48.899 you when you've got a boil that's final 00:01:50.24000:01:50.250 drop it out going hot and cold always 00:01:52.49000:01:52.500 make sure that the burner is actually 00:01:53.99000:01:54.000 dropping out guys this 82 degrees C is 00:01:57.70900:01:57.719 very very important and if we looked at 00:01:59.92900:01:59.939 these heat exchangers this one is one 00:02:02.14900:02:02.159 that's working there is a level of 00:02:03.85900:02:03.869 debris in this one but this one is 00:02:05.99000:02:06.000 working pretty decent because we've got 00:02:07.67000:02:07.680 81 degrees C coming in and 45 degrees C 00:02:11.05900:02:11.069 coming out this 00:02:12.29000:02:12.300 one is way off because we've only got a 00:02:14.27000:02:14.280 10 degree differential so basically it's 00:02:16.79000:02:16.800 not becoming a heat exchangers becoming 00:02:18.62000:02:18.630 a pipe and this one is very involved 00:02:20.84000:02:20.850 with a steel degree C coming in and a 00:02:22.61000:02:22.620 hotter temperature coming out now we 00:02:26.00000:02:26.010 exchange the water the cold water comes 00:02:27.98000:02:27.990 into the heat exchanger the flow from 00:02:30.35000:02:30.360 the space heating as the diverter valve 00:02:32.93000:02:32.940 moves across obviously we're getting the 00:02:34.88000:02:34.890 transfer of heat okay now as the level 00:02:38.78000:02:38.790 of debris comes more severe in this heat 00:02:41.30000:02:41.310 exchanger the differential temperature 00:02:43.22000:02:43.230 gets less and less and less and just 00:02:46.40000:02:46.410 just to put it in simple terms basically 00:02:48.35000:02:48.360 all we're doing guys we're changing the 00:02:50.66000:02:50.670 heat exchanger into a pipe and why we 00:02:53.18000:02:53.190 turn it into a fight because we just 00:02:54.68000:02:54.690 will get to the stage where one single 00:02:56.39000:02:56.400 track through the heat exchanger so it's 00:02:58.43000:02:58.440 no longer an exchange in heat so the 00:03:00.56000:03:00.570 course of action there's to the heat 00:03:02.30000:03:02.310 exchange it out and give it a good 00:03:03.59000:03:03.600 cleanse 00:03:04.13000:03:04.140 now the reason for the video guys is 00:03:07.27000:03:07.280 there is so many plate exchanges that 00:03:10.04000:03:10.050 take now unnecessary and how many times 00:03:12.56000:03:12.570 have you done it where you've been with 00:03:14.30000:03:14.310 your customer you value booking they're 00:03:16.22000:03:16.230 ready to show the custom of the debris 00:03:17.87000:03:17.880 and surprise surprise you look a clown 00:03:20.00000:03:20.010 because there's no debris in there well 00:03:22.04000:03:22.050 there's a couple of checks that you need 00:03:23.84000:03:23.850 to do before you start dragging platy 00:03:26.27000:03:26.280 textures out the boilers and it will 00:03:27.86000:03:27.870 save you a lot of time if you if you 00:03:29.39000:03:29.400 heed what I'm saying now on a boiler we 00:03:32.96000:03:32.970 have the space heating thermistor the 00:03:34.58000:03:34.590 primary thermistor what you'll call and 00:03:36.41000:03:36.420 this is on the the central heating floor 00:03:38.81000:03:38.820 when the diverter valves in the heating 00:03:41.09000:03:41.100 mode this pipe supplies this space 00:03:42.77000:03:42.780 heating when we're in domestic hot water 00:03:44.30000:03:44.310 the diverter valve mechanism moves 00:03:46.67000:03:46.680 across and we move it to supply the 00:03:49.04000:03:49.050 plate now the sense rating thermistor 00:03:51.68000:03:51.690 has three functions the first function 00:03:54.74000:03:54.750 is for temperature modulation of the 00:03:56.42000:03:56.430 heating the second function is built-in 00:03:59.78000:03:59.790 frost protection at 10 degrees the pump 00:04:01.88000:04:01.890 energizes at 5 degrees of the Bertha 00:04:04.19000:04:04.200 burner will fire and raise it to 25 00:04:06.50000:04:06.510 degrees C so it spikes that frost on one 00:04:09.08000:04:09.090 and that's across most vile as these 00:04:10.85000:04:10.860 days now the third function is very 00:04:13.79000:04:13.800 important its high limit and high limit 00:04:16.88000:04:16.890 is rated between 82 and 85 degrees and 00:04:20.21000:04:20.220 that's pretty much a standard in the 00:04:21.89000:04:21.900 industry 00:04:22.48000:04:22.490 so the high-limit is what kicks in when 00:04:25.42000:04:25.430 the burner actually drops out so that's 00:04:27.12900:04:27.139 why the customer gets hot and cold water 00:04:28.84000:04:28.850 because it's the high limit staff that's 00:04:31.54000:04:31.550 reaching 82 because why is this getting 00:04:33.64000:04:33.650 so hot it can't dissipate the heat 00:04:35.77000:04:35.780 because the plate heat exchangers bundle 00:04:37.80900:04:37.819 with debris so that's the reason for it 00:04:39.67000:04:39.680 drop in now it's the higher limits that 00:04:41.08000:04:41.090 that dictates that okay now one thing 00:04:44.98000:04:44.990 the couple of things that you must do 00:04:47.05000:04:47.060 are I mean I'm not saying most I 00:04:49.36000:04:49.370 recommend that you do okay 00:04:51.87000:04:51.880 this isn't all that mascara compliance 00:04:54.37000:04:54.380 and this is a standard Honeywell gas 00:04:57.24900:04:57.259 valve along this gas valve we have a 00:04:59.74000:04:59.750 plastic note and we have a brass nut 00:05:01.99000:05:02.000 okay the plastic that the blast note is 00:05:04.74900:05:04.759 the low burner pressure the plastic 00:05:06.37000:05:06.380 notice the high burner pressure now with 00:05:10.36000:05:10.370 a gas valve the high burner pressure is 00:05:12.93900:05:12.949 controlled by the per mr and the setting 00:05:15.82000:05:15.830 the low burner pressure on Iran all 00:05:17.80000:05:17.810 atmospheric boilers guys is purely a 00:05:19.89900:05:19.909 manual setting so let's say this 00:05:21.79000:05:21.800 particular boiler the low burner presses 00:05:23.92000:05:23.930 to millibar on domestic hot water and 00:05:25.74900:05:25.759 heating and the high is 11.2 now let's 00:05:30.33900:05:30.349 say for instance that somebody has set 00:05:32.80000:05:32.810 that low burner pressure far too high if 00:05:35.05000:05:35.060 the set that far too high we've got a 00:05:37.27000:05:37.280 big problem there because basically it 00:05:40.06000:05:40.070 won't modulate so when the customers 00:05:42.43000:05:42.440 running hot water that's why they're 00:05:44.32000:05:44.330 having problems with it going hot and 00:05:45.49000:05:45.500 cold it's not the plant that's bong nope 00:05:47.52900:05:47.539 it's the low burner pressure that's too 00:05:49.36000:05:49.370 high so you've wiped out the modulation 00:05:51.24900:05:51.259 and basically the pipe with the prime 00:05:53.29000:05:53.300 minister mister will get hot and it 00:05:55.12000:05:55.130 would mimic the plate heat exchanger 00:05:56.77000:05:56.780 being blocked the other thing that you 00:05:59.08000:05:59.090 must check so that's one point to try 00:06:01.51000:06:01.520 and remember this will save you hours in 00:06:03.01000:06:03.020 your career the other thing to remember 00:06:04.74900:06:04.759 here I've got at the mister sheet if you 00:06:08.23000:06:08.240 just pan down onto the shade if you can 00:06:10.18000:06:10.190 if you can't get this then out the we'll 00:06:12.85000:06:12.860 gladly send you on this the mr. shake 00:06:15.27900:06:15.289 here I've got a clip-on thermistor 00:06:17.93900:06:17.949 the multimeter here 00:06:23.74900:06:23.759 one thing with multimeters I suggest if 00:06:28.17000:06:28.180 you don't fully understand the operation 00:06:30.27000:06:30.280 of a multimeter don't buy an expensive 00:06:32.73000:06:32.740 automatic one to start off with start 00:06:35.31000:06:35.320 off with a cheaper one if you actually 00:06:36.93000:06:36.940 set the range and if you physically have 00:06:39.42000:06:39.430 to set the raise guys it's like 00:06:41.24900:06:41.259 train-the-trainer so when you set in the 00:06:43.37900:06:43.389 range you understand what the ranges are 00:06:45.15000:06:45.160 so give yourself six month with a 00:06:46.65000:06:46.660 cheaper multimeter get to know the range 00:06:48.87000:06:48.880 settings and then by all these move on 00:06:51.33000:06:51.340 to your all-singing all-dancing fancy 00:06:52.95000:06:52.960 one that's automatic when you lose touch 00:06:55.11000:06:55.120 of what the range settings are by all 00:06:57.15000:06:57.160 means then go back to your cheaper one 00:06:58.98000:06:58.990 but train-the-trainer that's what life 00:07:00.71900:07:00.729 is all about train yourself okay right 00:07:03.36000:07:03.370 so if I take a reason on this the mr. 00:07:07.59000:07:07.600 okay I am looking there about ten point 00:07:11.18900:07:11.199 nine two I'll just do that again no I'm 00:07:16.65000:07:16.660 not I'm looking at eleven point five 00:07:18.36000:07:18.370 okay so if I come down which are two 00:07:20.76000:07:20.770 twenty degrees because that's going to 00:07:22.86000:07:22.870 be the range and look somewhere near to 00:07:25.58900:07:25.599 it there we're looking at eleven point 00:07:27.93000:07:27.940 four two okay always ignore the last 00:07:30.21000:07:30.220 digit I'll explain this more in depth if 00:07:32.01000:07:32.020 you wish so eleven point four two if I 00:07:35.40000:07:35.410 look there at twenty degrees come up at 00:07:37.92000:07:37.930 22 degrees so this the mister here guys 00:07:40.50000:07:40.510 is reading look roughly 22 degrees now 00:07:44.04000:07:44.050 we've already said that the high limit 00:07:46.52900:07:46.539 is 82 to 85 00:07:48.99000:07:49.000 so let's come to 82 at 82 degrees the 00:07:52.37900:07:52.389 thermistor the negative temperature 00:07:54.00000:07:54.010 coefficient will read one point one 00:07:56.37000:07:56.380 seven now it's possible for this the 00:07:59.58000:07:59.590 mister to be knocking off premature so 00:08:02.49000:08:02.500 that the mister could be going to if you 00:08:05.01000:08:05.020 like high limit at the 60 so it could be 00:08:07.74000:08:07.750 going to high limit it at let's say two 00:08:10.08000:08:10.090 point four nine now if that's the case 00:08:13.11000:08:13.120 then obviously the on domestic hot water 00:08:14.90900:08:14.919 also until eating the burner will drop 00:08:16.83000:08:16.840 in and out again so it would simulate it 00:08:19.35000:08:19.360 again that the plate heat exchange is 00:08:21.06000:08:21.070 full of debris so what you must do guys 00:08:23.64000:08:23.650 is checking low burner pressure and if 00:08:25.92000:08:25.930 it's an apt if it's a premix applies 00:08:27.45000:08:27.460 check the low the low fan speed is 00:08:29.96900:08:29.979 because of the long fan speed to our 00:08:31.46900:08:31.479 you're going to simulate exactly the 00:08:33.00000:08:33.010 same on a premix but go back to 00:08:36.71900:08:36.729 or they're always check that this visit 00:08:39.48000:08:39.490 the primary semester because if that is 00:08:41.27900:08:41.289 out orig it will simulate that place 00:08:43.80000:08:43.810 full of debris and trust me guys some of 00:08:46.11000:08:46.120 them are not the easiest jobs in the 00:08:47.28000:08:47.290 world to get out so you know it will 00:08:49.53000:08:49.540 save you a lot of time so that's just a 00:08:53.79000:08:53.800 brief video about unnecessary taking out 00:08:56.28000:08:56.290 plate heat exchangers okay I would say 00:08:59.87900:08:59.889 if I am born into death I'll hop back in 00:09:01.80000:09:01.810 but just trying to help out thank you 00:09:04.13900:09:04.149 very much for your time thank you
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