/ News & Press / Video / Refrigeration Life #24 . Walk-in Freezer Call And Hot Gas Injection Explained 🤔
Refrigeration Life #24 . Walk-in Freezer Call And Hot Gas Injection Explained 🤔
WEBVTT Kind: captions Language: en
00:00:04.490 stop everyone good morning on this 00:00:07.46000:00:07.470 beautiful day time to get a video back 00:00:11.11900:00:11.129 up you guys I know it's been a while we 00:00:13.16000:00:13.170 got a unit here in a cold room clean 00:00:15.50000:00:15.510 room I mean on a freezer I guess the 00:00:18.71000:00:18.720 call is this thing only runs for about a 00:00:20.63000:00:20.640 minute or so and shuts off and doesn't 00:00:23.78000:00:23.790 stay running and it's going out on a 00:00:25.31000:00:25.320 fault on all the alarms downstairs so 00:00:28.22000:00:28.230 we're gonna get into it trying to figure 00:00:31.13000:00:31.140 out what's going on here this is hooked 00:00:33.68000:00:33.690 up to all kinds of different controls we 00:00:36.20000:00:36.210 can see well dad we got hot yeah smells 00:00:40.10000:00:40.110 hot gas injection on electronic cut gas 00:00:42.41000:00:42.420 valve in there if I can I'm gonna try to 00:00:45.31900:00:45.329 get in to explain to you guys how hot 00:00:48.20000:00:48.210 gas injection works as well all right 00:00:50.36000:00:50.370 guys so the issue I was having here was 00:00:52.19000:00:52.200 that this fan cycle control is bad the 00:00:55.40000:00:55.410 thing was sticking in here and it's not 00:00:58.24000:00:58.250 it wasn't putting our fans on so we were 00:01:01.54900:01:01.559 going out on high head pressure we have 00:01:04.63900:01:04.649 a to 10 psi headmaster in this unit but 00:01:08.14900:01:08.159 you probably can't see it tucked away 00:01:10.39900:01:10.409 back 00:01:12.34000:01:12.350 you still got a cycle the fans 00:01:14.48000:01:14.490 especially when it gets colder out 00:01:16.36000:01:16.370 there's one on now but I'm you've got to 00:01:20.71900:01:20.729 keep the head pressure up for these with 00:01:23.09000:01:23.100 this hot gas injection you can probably 00:01:25.19000:01:25.200 hear it hissing desire electronic luck 00:01:27.98000:01:27.990 yeah spouts gas lads I throw the line it 00:01:30.92000:01:30.930 goes downstairs into the box but these 00:01:33.35000:01:33.360 are freezes then running minus 20 00:01:35.09000:01:35.100 Celsius it's in a lab setting you're 00:01:39.29000:01:39.300 running such tight parameters on these 00:01:41.30000:01:41.310 that you still got to cycle the fans in 00:01:43.37000:01:43.380 the winter while the discharged gas will 00:01:45.05000:01:45.060 not be hot enough for these to run 00:01:47.51000:01:47.520 properly at least in a cold weather area 00:01:50.35900:01:50.369 parts of the country it's what we have 00:01:52.24900:01:52.259 to do we got freezes I mean cool is over 00:01:55.43000:01:55.440 here cool is down there and more freezes 00:01:58.04000:01:58.050 over there you got a big freezer over 00:02:01.16000:02:01.170 there I just started that up a few weeks 00:02:03.71000:02:03.720 ago and we got a couple coolers in front 00:02:06.49900:02:06.509 of that the coolest run ma'am five 00:02:09.83000:02:09.840 degrees Celsius so and everything's in 00:02:14.51000:02:14.520 here these are all the controls we don't 00:02:16.22000:02:16.230 do these but we got relays for 00:02:17.84000:02:17.850 everything all for Safety's your limit 00:02:20.44900:02:20.459 just solenoid you pump down switches 00:02:22.53900:02:22.549 we've got a defrost relays everything 00:02:25.75000:02:25.760 fan proof switches all kinds of stuff 00:02:28.61000:02:28.620 for safety this is our little electronic 00:02:30.65000:02:30.660 board here we don't do this like I said 00:02:34.82000:02:34.830 like a Charles guys do all this stuff 00:02:36.41000:02:36.420 but that controls our hot gas if you can 00:02:39.28900:02:39.299 hear that in here going in right now 00:02:42.50000:02:42.510 that's that hissing sound so the 00:02:45.59000:02:45.600 parameters are so tight on these boxes 00:02:47.53900:02:47.549 they don't even want these like I can 00:02:49.19000:02:49.200 spin I mean like two tenths of a degree 00:02:51.22900:02:51.239 off they got to be right 00:02:52.61000:02:52.620 on the money at minus twenty minus five 00:02:54.69900:02:54.709 it's it's very tight and very critical 00:02:58.88000:02:58.890 here they monitor they do temperature 00:03:00.77000:03:00.780 mapping of every spot in the room it 00:03:03.19900:03:03.209 it's crazy it's very very strict 00:03:06.05000:03:06.060 environments here I wanted to also add 00:03:09.71000:03:09.720 guys on this why you see two systems 00:03:13.00900:03:13.019 here for each box because this is what 00:03:15.17000:03:15.180 you call a lead lag system okay one of 00:03:18.83000:03:18.840 these units they're gonna run for seven 00:03:21.44000:03:21.450 days at a time and then switch over and 00:03:24.47000:03:24.480 the other ones gonna run it's to give 00:03:26.00000:03:26.010 them equal run time but more importantly 00:03:29.31900:03:29.329 it's because these are such strict 00:03:31.84900:03:31.859 environments with pharmaceuticals and 00:03:34.00900:03:34.019 things like that that they cannot have 00:03:35.53900:03:35.549 these boxes down they gotta remain cold 00:03:38.05000:03:38.060 and at the proper tempo all time so one 00:03:41.18000:03:41.190 of these goes down the other one is 00:03:42.71000:03:42.720 going to automatically kick on to 00:03:45.25900:03:45.269 maintain the temp it's just it's just 00:03:48.11000:03:48.120 like a safety you know what I mean like 00:03:49.61000:03:49.620 one of these systems can totally you 00:03:52.39900:03:52.409 know coal and run this box just fine and 00:03:54.55900:03:54.569 then they switch over it's it's more as 00:03:58.22000:03:58.230 a a backup and as a security because 00:04:01.28000:04:01.290 these cannot be down and like I said to 00:04:03.86000:04:03.870 give them equal runtime they're set up 00:04:05.39000:04:05.400 on the controls to run for seven days 00:04:07.22000:04:07.230 and then they switch over to the other 00:04:09.53000:04:09.540 one that's the point of a lead lag 00:04:12.19900:04:12.209 system you know what their purpose is it 00:04:15.34900:04:15.359 just it's just extra security that 00:04:18.25900:04:18.269 you've got to have in really strict 00:04:19.67000:04:19.680 environments so like if something goes 00:04:23.45000:04:23.460 down the other one picks it up like 00:04:25.90900:04:25.919 these cannot be down because some of 00:04:27.40900:04:27.419 these boxes are going to have 00:04:28.96000:04:28.970 thousands of dollars of stuff on them 00:04:30.76000:04:30.770 maybe even more same thing over there 00:04:32.68000:04:32.690 with those big big fries that units over 00:04:35.65000:04:35.660 there same thing that's a huge freezer 00:04:38.02000:04:38.030 down there same thing with that lead leg 00:04:40.63000:04:40.640 everything here is set up like that all 00:04:42.70000:04:42.710 right so we're down in the truck here 00:04:44.11000:04:44.120 guys I wish I could show you the inside 00:04:45.76000:04:45.770 of that place but I can't it's just it's 00:04:49.06000:04:49.070 a place you can't film inside so you 00:04:51.22000:04:51.230 could see the settings are in the 00:04:53.71000:04:53.720 control panels and everything but I'm 00:04:55.21000:04:55.220 gonna show you guys a little diagram 00:04:56.44000:04:56.450 here and try to explain to you of this 00:04:59.89000:04:59.900 part that's very important from hot gas 00:05:03.37000:05:03.380 injection if some of you don't know I 00:05:05.65000:05:05.660 know it's not used in a lot of places 00:05:07.30000:05:07.310 but where temperature has to be very 00:05:09.13000:05:09.140 strict and right on the hot gas 00:05:13.06000:05:13.070 injection is one of what you use it's 00:05:15.46000:05:15.470 got to be used or it won't work right so 00:05:16.93000:05:16.940 I'm gonna show you this and then try to 00:05:19.69000:05:19.700 get in to explain it to you guys a 00:05:21.01000:05:21.020 little bit more so if you remember guys 00:05:22.60000:05:22.610 on the roof we got an electronic lock 00:05:24.88000:05:24.890 gas valve up there which meters in the 00:05:27.73000:05:27.740 gas down into our vaporators that third 00:05:30.79000:05:30.800 refrigerant line comes down okay this 00:05:33.13000:05:33.140 would be your normal distributor coming 00:05:35.62000:05:35.630 right off your expansion valve and it 00:05:37.36000:05:37.370 goes to your distributor tubes it goes 00:05:40.21000:05:40.220 into your coil this here is your ASC 00:05:43.06000:05:43.070 port which isn't just an auxilary side 00:05:45.58000:05:45.590 connector it looks pretty much like a 00:05:47.53000:05:47.540 tea sometimes it's poured it inside and 00:05:50.17000:05:50.180 whatever depending on the size of your 00:05:53.05000:05:53.060 lines and everything but normally you 00:05:55.51000:05:55.520 have your nozzle in here and your 00:05:57.49000:05:57.500 distributor it's very important this 00:05:59.89000:05:59.900 nozzle has to get installed here because 00:06:03.15900:06:03.169 your expansion valve will be over here 00:06:05.05000:06:05.060 so when your hot gas gets injected from 00:06:07.42000:06:07.430 the roof it goes right in and right into 00:06:11.38000:06:11.390 your coil through your distributors it 00:06:12.88000:06:12.890 can't go through the nozzle or it won't 00:06:14.89000:06:14.900 work right it will be too restricted 00:06:17.19000:06:17.200 like if you look over here this is your 00:06:20.68000:06:20.690 correct assembly normally this wouldn't 00:06:22.48000:06:22.490 be here your ASC port you got your valve 00:06:24.64000:06:24.650 right to your distributor with this 00:06:27.04000:06:27.050 you've got every hot gas coming in here 00:06:28.99000:06:29.000 so it goes in and what that does is the 00:06:32.20000:06:32.210 hot discharged gas mixes in in through 00:06:35.20000:06:35.210 your coil and it warms it up just a bit 00:06:37.02900:06:37.039 if you get too cold and by doing that 00:06:40.60000:06:40.610 you can regulate your coil temp in your 00:06:42.62000:06:42.630 your temp and keep it right on like I 00:06:44.33000:06:44.340 said were - 20 Celsius in this freezer 00:06:46.70000:06:46.710 and it's got to stay right on the money 00:06:48.74000:06:48.750 if you don't have like hot gas injection 00:06:50.78000:06:50.790 like this your temperature will not it 00:06:54.86000:06:54.870 will not maintain it will even get too 00:06:56.69000:06:56.700 hot or too cold that's why they control 00:06:59.09000:06:59.100 them with electronic valves to build on 00:07:01.01000:07:01.020 them they're their step-up valve so you 00:07:04.10000:07:04.110 can meter it in just as you need it this 00:07:07.49000:07:07.500 is a little pamphlet that comes with 00:07:09.08000:07:09.090 those ASC ports them spoil and make some 00:07:11.96000:07:11.970 heat we ordered our units with heat 00:07:14.06000:07:14.070 craft the factory installed these for us 00:07:17.00000:07:17.010 I've also seen these installed wrong 00:07:19.58000:07:19.590 they haven't put the nozzle in the right 00:07:21.83000:07:21.840 spot and it creates a mess so but I've 00:07:26.15000:07:26.160 had to change these out as well and put 00:07:28.52000:07:28.530 new distributors in and everything when 00:07:30.23000:07:30.240 stuffs been wrong so I try to just keep 00:07:33.35000:07:33.360 this because it's a good thing to happen 00:07:34.61000:07:34.620 you don't see it much alright 00:07:37.10000:07:37.110 it's up guys it's good to be back on the 00:07:40.88000:07:40.890 ride home here um I hope I did a 00:07:43.34000:07:43.350 halfway-decent up job trying to explain 00:07:47.45000:07:47.460 sort of how hot gas injection works I 00:07:49.52000:07:49.530 mean 00:07:50.90900:07:50.919 it's a little more to it but it didn't 00:07:52.83000:07:52.840 it's pretty much how I was trying to 00:07:54.89900:07:54.909 explain it you've got to you got to 00:07:56.90900:07:56.919 remember it's not hot gas defrost it's 00:07:59.36900:07:59.379 hot gas injection so they sort of work 00:08:02.79000:08:02.800 on the same principle by date they work 00:08:05.15900:08:05.169 different this hot gas injection is made 00:08:07.55900:08:07.569 to maintain a certain temperature it's 00:08:10.95000:08:10.960 not a constant flow it's got to be 00:08:12.99000:08:13.000 metered that's why they do it with the 00:08:14.73000:08:14.740 electronic valves because you can meter 00:08:16.32000:08:16.330 them with those stepper valves a lot 00:08:17.90900:08:17.919 better you know I mean you can only let 00:08:19.98000:08:19.990 in a little bit at a time if you want 00:08:22.46900:08:22.479 there's all kinds like the sensors and 00:08:24.11900:08:24.129 controls on these things that then 00:08:26.64000:08:26.650 monitor that how much we need like see 00:08:28.92000:08:28.930 the set points - 20 on that that think 00:08:31.23000:08:31.240 it's not like - nineteen point nine - 20 00:08:34.46900:08:34.479 you know - twenty point one it meters it 00:08:38.81900:08:38.829 as it needs it you know the colder it 00:08:41.06900:08:41.079 gets the more it lets in the warmer it 00:08:42.83900:08:42.849 gets it backs off so these these have 00:08:46.44000:08:46.450 electric defrost these particular ones 00:08:48.24000:08:48.250 these freezers it's not hot gas it's 00:08:50.10000:08:50.110 electric defrost and those the coolers 00:08:51.96000:08:51.970 run all the time like 24/7 they never 00:08:55.13900:08:55.149 shut off because you're not these boxes 00:08:58.13900:08:58.149 like this they're not made to shut off 00:08:59.88000:08:59.890 at a certain set point they may need to 00:09:02.10000:09:02.110 maintain a certain set point so they 00:09:04.49000:09:04.500 they stay there they stay running except 00:09:08.13000:09:08.140 for defrost on the freezer 00:09:10.38900:09:10.399 if you guys got any more questions on it 00:09:12.00900:09:12.019 um whatever let me know in the comments 00:09:14.65000:09:14.660 I've sent me an email or whatever DM me 00:09:17.65000:09:17.660 on Instagram something like that because 00:09:19.86000:09:19.870 sometimes you got to see it you know 00:09:22.50900:09:22.519 it's much better when you can really see 00:09:23.94900:09:23.959 it working that's why I wish I could 00:09:25.26900:09:25.279 have showed you guys like the inside and 00:09:26.86000:09:26.870 what that all looks like would at your 00:09:28.96000:09:28.970 expansion valve there and the ASC port 00:09:31.17900:09:31.189 and all that all that stuff has to be 00:09:34.03000:09:34.040 installed properly and the orifice has 00:09:36.04000:09:36.050 to be in the right spot or it won't work 00:09:38.35000:09:38.360 it won't work right it causes all kinds 00:09:40.48000:09:40.490 of problems but on that note guys I'm 00:09:43.68900:09:43.699 hoping to get back on a regular routine 00:09:46.92900:09:46.939 here I know I haven't had a video out 00:09:48.30900:09:48.319 well over a month um I think all you 00:09:50.79900:09:50.809 guys have been sticking with me and the 00:09:52.26900:09:52.279 guys at the beginning and all that and 00:09:54.54000:09:54.550 try to get more back on track here on a 00:09:57.12900:09:57.139 better schedule I haven't been doing 00:09:58.72000:09:58.730 much service at all it's been crazy busy 00:10:01.74900:10:01.759 with just startups and all kinds of 00:10:03.51900:10:03.529 problems and again still places where 00:10:06.73000:10:06.740 it's very hard to film like today I 00:10:08.17000:10:08.180 couldn't even show you guys the inside 00:10:09.87900:10:09.889 of that place so I apologize for that 00:10:12.48900:10:12.499 but I'm gonna try to get back on track 00:10:14.67900:10:14.689 here and um as always guys anything like 00:10:17.25900:10:17.269 comment subscribe if you want I'll catch 00:10:19.11900:10:19.129 you boys on the next one
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