Industrial Direct Fired Make-UP Air Over Heating The building

[@Mr05Tundra]

the remote selector in the space was probably wired as such because they weren't using it. The Maxitrol has a setpoint dial at the unit so no one messes with it down below.

[@mychoclabwinston]

Props to you, I consider myself a great HVAC tech, all Resi/small commercial under 400kbtu rooftops, but this stuff is another beast that requires good training, and good mechanics, great video, subscribed.

[@HVACRSurvival]

Thanks for the sub 👍👍. I work on anything from residential to bigger things and everything in between. I've always felt there is a difference between not knowing how to do something and not being able to figure it out.

[@bullishbear2686]

Worked on a DFMUA where the flame was massive and orange. Flames were reaching the blower, motor and belt. Whole blower compartment walls were charred. Unit’s saving grace was the high limit. Gas pressures were good and maxitrol repeater, modulating valve and sensor checked out ok. Was as if something in the space like a fire damper closed shut on the supply air.

[@HVACRSurvival]

You would think since it has a dual pressure switch that it wouldn't be able to run with any type of restriction because it would be either above or below the static pressure zone that they want and should have caused it to shut down. Weirder things that happened👍👍

[@bullishbear2686]

@@HVACRSurvival this was disconnected bypassed by previous contractor

[@jeffreykubiak5126]

Similar to Ruup thanks ! Got hurt at work be safe out there. Fell down some stairs coming off a roof.

[@HVACRSurvival]

Dang man, I hope your ok! Thanks 4 watching!

[@superiorcomfortheatingairl3373]

I agree locking out the disconnect when your in the unit cleaning the burners is well advised, if not that would be a perfect part in horror film movie

[@HVACRSurvival]

👍Safety is commonsense that's not so common to those with no sense. 😏

[@Tjita1]

"Why is this off?" *click*

[@Eddy63]

Nice vid Rick ... That blower motor looked small for that unit ... Lol ... Much appreciated ...

[@HVACRSurvival]

Lol. Yea tiny motor syndrome 😁👍👍

[@businjay]

Nice Videos, some of the stuff we get to work on is challenging and Fun, Love your Bracelet, I worked on some direct fired heaters for a Horse arena when I worked at the stock show in Denver, If you got locked inside that thing you were going to be Burned alive, the things were HUGE. thanks for sharing your knowledge and yourself with the rest of us :-)

[@HVACRSurvival]

Thanks for watching. You're the first one that's finally said something about the bracelet. Here's where you can get yours. Mine was based in Ohio. If there's any questions I can answer shoot me an e-mail to [e-mail] www.timetorevive.com

[@businjay]

@@HVACRSurvival Ha ha, I thought that bracelet meant something far different, the Colors are very similar to a tribe I belong to, not Knocking yours, was just Confused, Keep up the Cool videos :-)

[@maxpenrose3032]

That looks like a well built machine big ass electric motor huge Regulator valve that's one nice unit lol

[@berylwhite2983]

Great video

[@JuanTodoli]

Wow, huge motor there 😮

[@HVACRSurvival]

Yea, when it kicks on you don't want to be inside. 👍👍

[@jonnymac31]

Nice man. I enjoyed this one. That 0-40 dial is for override when you have a 115 with it not for calibration. Sounds like tech support let you down on that.

[@HVACRSurvival]

Like I said it didn't look right for calibration. Go figure. Thanks for the insight👍👍

[@55bigblockcid30]

I suspected discharge air temp sensor ,Common problem with those Maxitrols. That is one of the cleanest units I have ever seen.Where I live in Indiana those burners are a common thing to rust the holes shut.Always have to drill them open.Very time consuming.I use extra long drill bits.

[@HVACRSurvival]

Thanks for commenting! yeah I'm not looking forward to drilling them out. This unit was less than a year old.

[@55bigblockcid30]

@@HVACRSurvival Fastenal has the longer drill bits ...you have to order them usually.They are a lot easier than trying to use a short drill bit.I think I needed 2 different sizes for the orifices .Also there are holes in the back for air that most people dont realize.They are hard to get to but they make a difference on how the flame burns.I`ve worked on 2 or 3.lol

[@markwimbush581]

I am thinking that you also have a gas supply problem. It should be possible for the unit to go to high fire right away without gas pressure dropping like that.

[@adameater]

Love learning about these MAU's. Not a lot on KZbin on them. So is your company letting you make KZbin vids now?

[@jamestoy426]

Cool never seen one looks like a big gas furnace

[@HVACRSurvival]

I've been asking to get into bigger things, well this was one of them. 😂🤣👍👍

[@jacobcolby1423]

Great vid! Big piece of equipment. Haven’t done a lot of service work on those yet just some pm stuff. We service several warehouses/factories that have similar direct fire M/U air units like that. Helpful video thanks!

[@HVACRSurvival]

Im always learning myself, thanks for checking it out👍👍

[@hvacir9176]

thanks for sharing sir.

[@HVACRSurvival]

Im glad you liked it, thanks for commenting.

[@punchpunchowned]

I work on units like these the od time. If there is time I think a good video would be going over the gas system. As far as how to set gas pressures and what to look for, Also the maxitrol mod controller. Besides that good video!!

[@HVACRSurvival]

Thank you 👍👍

[@HVACRNorth]

Good vid

[@HVACRSurvival]

Thank you Sir👍👍

[@sharky5570]

Just worked on 5 big ones that were over firing tripping out limit. What was the supplied temp set point? Set all of mine at 90 deg.

[@HVACRSurvival]

I left it at 60*, they can change it. It's a factory so that probably don't want a lot of heat blowing on them. That's the benefit of having the remote control panel.

[@AVR-hf1rl]

Where did you get your magnetic hanger strap for you meter from Thanks

[@HVACRSurvival]

Ebay or Amazon. Says Fluke but probably fake, looks just like my real one. I'll get you a link.

[@AVR-hf1rl]

Thanks

[@texture6]

Awesome. Was that a ball bearing or shelve bearing blower. The belts being loose would affect the air flame quality. When testing the static pressure was that positive or negative in the system. Great work on editing very smooth 👍🏻💯

[@HVACRSurvival]

The blower was pillar block bearings I believe. They have a maximum RPM range that you can set it at, if you notice there's reflective tape on the big Pulley, the gas valve is a negative pressure gas valve, the pressure switches are shooting for a minimum and maximum static pressure across the burner plate. I forget what the numbers were. Thanks, I'm trying to keep my locations and company name hidden. That's what got me in trouble last time.

[@texture6]

I understand and thank you for the effort you put forth on your videos.

[@HVACRSurvival]

@@texture6 right here is what I like👍👍 conversating with others that share the same passion to be the best they can be

[@texture6]

👍🏻💯

[@capitolrefrigerationheatin7501]

how do you adjust air flow if the pressure drop across the burner is out of spec?

[@HVACRSurvival]

You adjust the burner plate gap. We had a lot of problems when we first started this one and a factory rep had to come out and spend nearly two days on it.

[@DigiVore.official]

the filter at the begining help

[@steveblake8766]

#3 Thumbs UP

[@HVACRSurvival]

Thanks!

[@ramonjr1000]

👍🏼👍🏼

[@HVACRSurvival]

Thanks man!

[@joeyoung2834]

😲

[@spykillergames8402]

bloody hell that motor is big enough to run a locomotive

[@HVACRSurvival]

460-volt, pulls 49 amps I believe.

[@RJMaker]

That is one big Make Up unit..

[@royamberg9177]

Those discharge air sensors go bad frequently. All kinds of funny things happen then

[@HVACRSurvival]

Yes sir👍👍 That's why the gas pressure was dropping as fast as it was, it was flying wide open with no modulation. All of this was properly sized and installed Recently so I know it wasn't an under size gas line, but possibly the regulator coming into the building might have been taking a dump but neither seem to been the case.