LENNOX RTU DUCT DETECTOR TROUBLE
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- Опубликовано: 18 ноя 2018
- This was a service call on a Lennox rtu with a duct detector trouble condition. I found that the unit had a bad condenser fan motor that caused the main breaker to trip. I replaced the motor and the unit is now working properly.
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my dad did HVAC in texas for 45 years and 1 of the first things he taught me was tightening the set screw the way you just showed us
Great video! I'm hvacr contractor but I use to work in the field for a company doing commercial work. I use to make videos of my work just to show the news how its done the right way. Im a stickler for detail and uniformity when installing anything contractors to ductwork. When you mentioned the line side of the disconnect was reversed I thought about myself, even though it doesn't matter in this case, it could matter in another situation. I've watched a ton of videos on youtube and you're by far one of the best. You're very informative and straight to the point without all the unnecessary useless information. Some people on youtube talk entirely too much before they make their point. Thanks for the video.
You're like a teacher, first you tell us what you'll cover,
then you cover it, then you tell us what you covered.
Efficient trouble-shooting skills! Well explained in logical detail and thorough as always. Best HVACR vids on YT for new techs in my opinion. Thanks!!!
Thanks bud
We are fortunate in my area. The fm requires the duct detectors be serviced by the alarm company. We mount them to the ducts and all wiring is the responsibility of the alarm company.
Good point about being careful turning on a disconnect.
I always look away and squint my eyes in case there is a dead short. That way you don't get a welders flash.
A guy I know had that happen and he was mostly blind for a few days.
Very thorough video, surprisingly enough with all my experience on Lennox, we did not sell many of those particular models with that higher end controller. You should consider showing how to set it up and explain its operation. It looks like it might be a little bit of a pain.👍👍
Boy, you look even younger in this video. Good job.
Good find... Them Lennox relays sometimes take a dump.. but the fan wires are notorious for that specially Lennox
Thanks for Ur hard work, I just got graduated and passed an EPA test, and now looking for work, BUT, every company are looking for 2-10 years experience 😭. It's been two weeks
Guys...never trust a disconnect to be interrupting the power. At 3:50, once power is confirmed coming from the panel downstairs, the next step is to confirm that no power is coming from the load side of the open disconnect... phase to phase, and phase to ground. Also, you want to check the line side of the contactors to find potential crankcase heater problems. No pun intended.
HVAC Talk Pro members have access to my electrical articles in the Educational Forums.
Great point I checked it but I didn't get it on film!
I will be troubleshooting a Lennox tomorrow with smoke detector problems allegedly thanks for the great video!
Gotta love the easy money condenser fans provide. I see you're growing the fan base! Pretty badass, duder 🤙 I'm not sure where you were at when I started watching not too long ago, but you're channel is growing.
Like the beginning "typical Lennox unit...." and im lol looking at the burn mark going up from the disconnect. Seen that a lot. Had a few issues with the 460v Lennox condenser fan motors burning up and tripping the main breaker. You would think there would be more of a safety circuit in the unit itself
Did you say anything to those guys doing the install?
Thanks for the tip regarding the shaft scoring when tightening the set screw by going back and forth, just used the same trick 😀 thank you 😀
Awesome I'm glad I could help!
It's always better to use circuit breaker and switch-disconnectors in the right direction. In circuit breakers and switch-disconnectors, there are often spark extinguishing chambers that only work properly if the power supply and load are connected in a specified direction. If you connect it the wrong way round, the contacts burns out faster or weld together. In the worst case the disconnector can blow up completely.
I don't see extra fuses or circuit-breakers in the RTU for things like the fan motors. I think 40Amps (from the tripped circuit breaker) are way to much for the fan-motors. The same thing for the compressors. Circuit breakers with auxiliary contacts could be used to switch off contactors and/or display error information on the controller display and/or, if necessary, to force the entire system to shut down, or to run in a emergency mode if it's possible. You could also use motor protection switches that switch off when a short circuit occurs and when the current rises over the adjustet value. Without tripping the main circuit breaker and stress the cables. There are motor protection switches that are screwed directly onto the contactor contacts. They have NO and NC Contacts for status-report function or other things.
nice technique on the set screws I'm going to keep that in mind. I still think you need to invest in a megaohmeter it will do a lot better job picking up shorts curious the true insulation tester. I've had it with my fluke 902 I can't pick up a short to ground but I can with a mega ohm meter. You are putting More Voltage through the windings with that insulation tester. Sometimes with the insulation tester you still won't pick up a short to ground in a winding but you have a lot better chance. You have great videos and I have learned a few things from you you're very thorough. I work for a school district in the Seattle area Renton School District we are going to have a few job openings in the HVAC department in 3 years if you're interested in relocating to Seattle and working for a school district that pays 80 grand a year plus benefits I'll make sure you know when it opens up. I really want to have some good help one of my co-workers is completely worthless.
Use your refrigeration wrench to tighten/loosen the nut on the fan blade. Also, be sure to set the fan blade at the correct height.
great tip!
Good advice on standing not indirect of the disconnect when getting power back, but when you flipped that breaker look like you were standing right in front of it. Guess some people don’t understand fan blades come balanced from factory, you’ll notice on some blades there’s weights on them and any type of alignment from the blades or balance issue kiss your bearings goodbye. I knew about balancing through the field but I watched a grayfurnaceman video and he actually talks about the weights being on the blades.
Thanks for watching bud, yeah I was more concerned about standing in front of the electrical cabinet. The disconnect had a cover over it
I'm kinda surprised they don't install smaller individual breakers inside , like 1 for the fans and 1 for the compressor for instance.
Great vid as always !
I subbed, I've become so nosey watching and learning here and there and I promise I will not do repairs or work myself as I am not licensed to do so.
Awesome thanks for watching
Man I love your videos, very thorough explanation. Keep up with your videos I look forward to watching them and gaining knowledge as I myself am in my first term of HVAC school at a local community college in Albuquerque.👌🏽👍🏼✊🏽
Right on bud thanks for watching and taking the time to leave a comment!
Thank you for another intersecting video,,, it seems easy when the cause of the problem is pointed out..,,, However it is not always so,, Most enjoyable,.
Cool. I bet they had some high head pressure before that tripped the breaker. Luckily it shorted and tripped the breaker or else you'd be dealing with a burnout.
0:06 FUCK, HERE WE GO AGAIN, WHAT'S THE "U" STAND FOR???? LOL
I’ll disconnect all the contractors and reset the breaker. Then go thru engaging each contactor manually to isolate the issue. Usually a fast way to find the issue.
Great job again
Crispy fan motor. Good stuff.
Thanks bud
Nice job man
very good video, thank you as usual.
That's a crazy install how did they how do they expect that to breathe properly I guess they had to mount it that way possibly because of the ductwork? I love your videos you're a very good teacher looking forward to more
Love your videos, definitely learned a lot
Thanks for the video bud👍👌
Hi Chris. Good to see your doing well and great videos as usual. Always the compressor or fan motor to take out the main breaker. Im building a HVAC website over in the UK and it’s going to be accessible to the states. I would like to know weather there’s anything I can add to it. It’s going to be a forum site for all users.. thanks buddy!
Nice repair video
Good job!
8:54 "that's what she said"
Good trace and repair on CFMtr.
Nice job! 👍🏼🤙🏼🤘🏼✌🏼
Right I always change the blade to but I carried a lot of motors on my truck
Did you check if the condenser fan motor if it was good? Continuity, and earth test,,,If it was good all that was needed was to cut the wires back and make new connections,,, .. But if the customer was not worried about the cost too much, its okay.
Why did it short?
great video..... tkxs
Good job
What if you have a tripped breaker and when you turn it back on everything has power except for the duct detector. I have no lights lite but, on the fire panel is says duct detector. So everything seems to have power except for the duct detector. I checked all the wires. Everything is connected, nothing is visually wrong with it.
Hey Bro love your videos, I am in the process of going through all your videos just to catch as much information as possible from you.
Thanks. !!!
Are you based in Cali. that Unit you are talking about in minute 3:00. I bumped into that exact same unit at a supply house. I've nevver seen those types of units so maybe it might be somewhere in the SoCal area.
Thanks for watching bud, I'm in Riverside,Ca.
This guy can see problems with the units before they've even been fully installed
I like ur videos👌😎
GREAT FIND CHRIS HAPPY THANKSGIVING
Same to you, thanks!
Good work, I like it..
Thanks bud
Looks like that condenser is too close to the wall
9v to ground doesnt always pick up a short. when my meter picks it up then disappears, it's time to take out the megger.
Nice video, thanks for the tech tip for fan blades. Should the same apply for blower wheels?
Yes sir run those set screws in and out!
@@HVACRVIDEOS I just seen someone else talking about running set screws in and out a few times. This something you've always done or did you just pick that up to? It makes sense, I got to admit I'd haven't really done it prior but it's something I'm going to keep in mind.
Yeah running the screws in and out was taught to me many years ago by my mentor.
You should try mega ohm meter on the motor.
They don’t have breakers on the unit that blow before the mains?
no they dont, Thanks for watching I will be going live on RUclips this evening 7/1/19 @ 5:PM west coast time to discuss my most recent uploads and answer questions from emails and the chat. Come check it out if you can ruclips.net/video/rlHkdZSIjdU/видео.html
Scary voltage.
In the EU we have 400/690vac in industrial distributions. Its also scary but 208vac are deadly also.
Lennox schematics.....🤯
Wow - that’s a whole lot of volts - very dangerous!!
So you are troubleshooting the unit and another company installs another one right next to you (with a disaster waiting to happen)? Wouldn't it be much more easy to have only you on the roof and installing and PMing ALL the units up there? Or do the other units belong to another customer who shares the roof with your customer?
Old video and comment but I just watched the video. He mentioned that its on a mall, from experience some malls the customer is responsible for there own units. They are frequently ignored from my experience also. Worked on my customers equipment and witnessed equipment nearby self destructing because of fan or compressor failures, told the tenant of that space about it and have them shrug and do nothing.
I noticed the fan motor sits in a holder if your replacing both the motor and the blade will it just pull out without taking the blade separate?
Yes it will. He was just showing how to do it when only replacing the fan or motor.
what’s that putty called you use for brazing? What’s the brand name? thanks in advance
VIPER WET RAG
Wait did you say the disconnect works the same I am usually not going to be the electrician in the chat but I have abb training and the switch can only break faults in the forward direction hence the breaker tripping and it also has thermal protection in the forward so let me know how it works the same .::?
And one more thing about the disconnect switch before I be a electrician put the covers on the disconnect switch before you turn them on ... it’s for your saftey
Well thanks for reading and giving the like that’s the best outcome and remember the cover is there for your safety lol I can’t spell
I appreciate your comment! I try and read every comment but there are so many I dont get to respond to every one!
I need help with imc m1-8 version 6.0.
how can I contact you? I really need your help in this profession.
running it in
Yep
Had a condenser fan located high near an overhang and it couldn't get rid of the heat. Had to put it on the ground. $ ca-ching
Why were there 500 volts coming into the disconnect
Because its was a 480 volt system
just watched did again,, you had a continuity between a fan wire and earth,,, Okay
How are you doing
Good thanks
👍👍👍👍
😎😎👏👏💪💪👍👍👍👍
is it just me or is there no audio?
I am not an electrician, meter says 490 make a 180 and call an electrician....
Trumppppppppppp 2020
Everyone does horribles job .
Just do the job with out talking crap like a racist woman.
Apparently you are new to my channel watch a few videos and let me know how horrible my work is.........
I wach all your videos .and I lern
So much .its just when you talk crap about other techs.
Please don’t install your units wonky!