Hey man I'd like to thank you for your vids. Not a whole lot of MUA vids out there but we take care of a whole bunch at my company . It seems that nobody really understands them and leaves them quiet often not looked at . I always open them up and try to familiarize myself with them but as an apprentice it's nice to see vids like this. All you guys on UA-cam are like the senior techs I never got to work with and are sculpting me into a great tech. Thanks again
I’m not in HVACR, but subscribe to all the channels lol. These direct fire units fascinate me in that they are primitive with giant fire and a big fan, yet have all the latest controls and technology in them. Cool blend of old and new. These direct fire units, big unit heaters like the Modines, the huge various types of exhaust and supply fans, supply vents, these don’t get shown on other channels that I come across and they are my favorite to see. You do an incredible job filming and explaining them. Thanks, bro. Stay safe on that ice and make sure ya don’t forget your sunglasses in the truck!
😆 I got the call back to the previous video, Thank you Rayfanz1! I appreciate the support. They are primitive but not too complicated when you understand them, just like anything else we do I guess. You must understand it to fix it
Thats funny this video came out today. I was doing a PM on a Rapid MUA. I was cleaning the flame sensor with my steel wool, not bring ruff or careless.....and the rod straight snapped in my hand. Clean shear of the rod. No damage to the ceramic isolator. I was like "oh s**t". I also was loosening the set screw on the spark rod to pull it an clean it. The set screw snapped off. I was like WTF...damn I'm cursed. Luckily for me the place i was at was an industrial site. Found the maintenance guy and he graciously was able to weld the flame sensor back together. He said it was a stress fracture of the rod. The break was so clean, you couldn't see the spot it sheared at when i held the 2 pieces back together. From now on im gonna take the whole pilot assembly apart like you did. I was able to secure the spark rod from moving......fired up the MUA and its working flawless. Almost a FML kind of day....but worked out in the end. Great video as always Steve
Thanks Jason! That sucks, I try not to remove at least the spark it's just a pain to get positioned back just right. Never had one break like that, sounds like it was one of those days, I happens.
@Everything HVACR i actually had a better flame signal after the repairs. Same fireye like in the video. I had 17.67 volts. Im gonna put in for new parts. Just glad it was able to fire back up again. Those flame sensor rods can come out of the front ( burner side ) by loosening the screw on the back that connects to the fireye.
I love your videos, as well as everyone else doing HVACR content. I'm 20 and not in the HVACR field, but understand it very well and am especially good at electrical troubleshooting. I plan to become a low voltage/fire alarm technician, but HVACR is always an option as well. One thing I'm unsure of on these direct fired units, since there's no heat exchanger, how are the combustion byproducts/CO separated from getting into the supply air and into the space?
Thanks Doc! This is from Captive aire web site. Direct-fired heating emissions using modern fuels consist primarily of water vapor and carbon dioxide. The air-fuel ratio of direct-fired heating systems is typically 50 times the stoichiometric requirement, ensuring complete combustion and minimizing production of carbon monoxide. This excess air also has the effect of limiting flame temperature, thereby reducing the formation of NOx.
Great Video! Do you think someone tinkered with that gas valve at the opening scene of the unit to lower the high fire gas flow? Just a thought...Thanks for the vids
Thanks HrdWorkin! That is always a possibility and a good thought but I don't think so, once the new TS144 was in I had to increase the pressure after decreasing to allow to operate without tripping limit.
Great repair and information 👍
Thanks Stephen
Hey man I'd like to thank you for your vids. Not a whole lot of MUA vids out there but we take care of a whole bunch at my company . It seems that nobody really understands them and leaves them quiet often not looked at . I always open them up and try to familiarize myself with them but as an apprentice it's nice to see vids like this. All you guys on UA-cam are like the senior techs I never got to work with and are sculpting me into a great tech. Thanks again
Thank you Drew! I appreciate the support and this is why I and others do this, glad they help.
I’m not in HVACR, but subscribe to all the channels lol. These direct fire units fascinate me in that they are primitive with giant fire and a big fan, yet have all the latest controls and technology in them. Cool blend of old and new.
These direct fire units, big unit heaters like the Modines, the huge various types of exhaust and supply fans, supply vents, these don’t get shown on other channels that I come across and they are my favorite to see. You do an incredible job filming and explaining them. Thanks, bro. Stay safe on that ice and make sure ya don’t forget your sunglasses in the truck!
😆 I got the call back to the previous video, Thank you Rayfanz1! I appreciate the support. They are primitive but not too complicated when you understand them, just like anything else we do I guess. You must understand it to fix it
Thats funny this video came out today. I was doing a PM on a Rapid MUA. I was cleaning the flame sensor with my steel wool, not bring ruff or careless.....and the rod straight snapped in my hand. Clean shear of the rod. No damage to the ceramic isolator. I was like "oh s**t". I also was loosening the set screw on the spark rod to pull it an clean it. The set screw snapped off. I was like WTF...damn I'm cursed. Luckily for me the place i was at was an industrial site. Found the maintenance guy and he graciously was able to weld the flame sensor back together. He said it was a stress fracture of the rod. The break was so clean, you couldn't see the spot it sheared at when i held the 2 pieces back together.
From now on im gonna take the whole pilot assembly apart like you did. I was able to secure the spark rod from moving......fired up the MUA and its working flawless.
Almost a FML kind of day....but worked out in the end.
Great video as always Steve
Thanks Jason! That sucks, I try not to remove at least the spark it's just a pain to get positioned back just right. Never had one break like that, sounds like it was one of those days, I happens.
@Everything HVACR i actually had a better flame signal after the repairs. Same fireye like in the video. I had 17.67 volts. Im gonna put in for new parts. Just glad it was able to fire back up again. Those flame sensor rods can come out of the front ( burner side ) by loosening the screw on the back that connects to the fireye.
Probably easier that way with the angle of the rod, interesting you had a better flame signal
So glad it doesn’t snow in Florida
😆 yeah wish it didn't snow here either, this was actually an ice storm smh, Thanks for watching Ashton!
Good stuff, I had one of those unit have a stuck open pilot solenoid valve. Made a nasty mess
I'll bet, Thanks Sharky!
I love your videos, as well as everyone else doing HVACR content. I'm 20 and not in the HVACR field, but understand it very well and am especially good at electrical troubleshooting. I plan to become a low voltage/fire alarm technician, but HVACR is always an option as well. One thing I'm unsure of on these direct fired units, since there's no heat exchanger, how are the combustion byproducts/CO separated from getting into the supply air and into the space?
Thanks Doc! This is from Captive aire web site. Direct-fired heating emissions using modern fuels
consist primarily of water vapor and carbon dioxide.
The air-fuel ratio of direct-fired heating systems is typically 50 times the stoichiometric requirement, ensuring complete combustion and minimizing production
of carbon monoxide. This excess air also has the effect
of limiting flame temperature, thereby reducing the
formation of NOx.
More on their site if interested.
Great video, roof looked like a ice skating rink.
It was, Thanks Mike!
Great Video! Do you think someone tinkered with that gas valve at the opening scene of the unit to lower the high fire gas flow? Just a thought...Thanks for the vids
Thanks HrdWorkin! That is always a possibility and a good thought but I don't think so, once the new TS144 was in I had to increase the pressure after decreasing to allow to operate without tripping limit.
In the beginning looked like you were finding a spot to ice fish lol 🐟
😆 yes it did, Thanks Josh!
Seems like you work on a lot a roofs that are huge
We do a lot of warehouse spaces and commercial buildings of all kinds
Was that Dwyer SP meter built in unit? The quality looks good on these compared to Carrier , Lenox...
I believe they come like this, haven't installed any of these so I could be wrong but I see a lot with them
I had to watch it twice 👍! Don't get left behind > P r o m o s m !!
Thanks Silas!
Kids...stay in school!
? Come to the trades!
👍
🙏
Looks similar to a captive aire in some ways
They are all basically the same unit only slight differences, I like captive aire controls better
Let’er rip 🔥
Thanks Joe!