Basic preventative maintenance

In this video I go through a simple preventative maintenance on a rooftop package unit
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[@Imwright720]

At church this past Saturday the unit started squealing. Because I watched one of your videos I knew how to diagnose it. I knew to take the belt off and let the motor run to see if it was indeed making the noise. If not then to check the bearing play on the squirrel cage. I didn’t get to do it but at least I knew where to start. I’ve always enjoyed problem solving and so far have been able to repair my own a/c anytime something happened. A lot of times things you learn help somewhere else in life. My wife always wonders why I watch so many different types of videos, that’s why.

[@thefreshride1510]

Hi brother or friend. I just found your channel and videos. I really like them and you get a new subscriber. Greetings

[@jrh86]

Useful and helpful yet again thanks

[@davejohnsonnola2758]

Very cool,thanks for the walk thru on the roof. We are still upper 80s overnight in late September with an eye over the shoulder for hurricanes, but looking forward to your pre-winter heating checkup follow thru. Gracias!

[@davejohnsonnola2758]

No, my former home in the mountains of Costa Rica is much cooler and too far south for hurricanes. I'm in New Orleans, LA.!

[@actechformallyyomama746]

Remove contactor covers and inspect the points. Check the wires on the disconnect. Now on the line voltage connection of the transformer. The biggest problem I found was on a call for heat. The transformer was hooked up like that one with 208v to the unit and the factory hooked it to the 230v connection. The electric heat would run for just a couple minutes and cycle off. The thermostat was set to 90 and it was about 40 degrees in the space. It had an old mercury thermostat. The low control voltage was over heating the heat anticipator so the stat would satisfy. Then cool down in the 40 degree room rather quickly and cycle the heat back on. Took me a while to figure this out. On a 20 degree roof and a frozen brain things go slow lol. Not many of those stats around anymore. I don’t know if they teach about heat anticipators any more.

[@texasbread107]

Thank you so much for this I’ve just recently got into Commercial HVac and I’ve been kinda lost doing these PM’s

[@curioushvacguy6876]

no problem- any questions, feel free to email me [e-mail]

[@abdulrehmanakram.3030]

i like ur videos. u make very good videos

[@anthonycanty3755]

Great video

[@ramonmolina2394]

Great job!

[@jeffpook9471]

just learning, by taking using your return temp that could be used as your wet bulb temp, if you had to put on your gauge set, good video just found it

[@bryantylerservices]

Another great video.. Like the comment on pressures.. Could be looking for trouble.. Unless its required per a realtor on a inspection ,before selling home.. Thx again! Bryan Tyler Refrigeration

[@kcomfortsystemshvac7060]

Great video,professional explanation,,,,,,I have litle question,,,,somthimes,,do you come cross whit the ICM 220 relays lock out ? How do you deal whit it,,,.?

[@curioushvacguy6876]

Hey L Mechanical - I honestly dont mind them, I havent seen them a bunch in my area and havent had any issues with them. Have you had a bunch of issues with them? if so what sorts of issues? feel free to email me as well [e-mail]

[@fernandorosillo9715]

Great job.

[@SweSuf]

How often do you find problems during PMs? Of course it varies, but is one in ten, almost every time, or something else.

[@miltoncastro935]

hey i do the same capacitors under load the same way 👍👍

[@zachtruax3222]

Here in Indiana I’ve always been told outdoor units have to have a freeze plug in the trap to prevent the trap from breaking in freezing weather. Do you guys not use those or does it not really matter? Love the videos, very informative. Keep up the good work

[@johnnyb8629]

When you been in the trade as long as I have , you get a equally long list of things not to do. I have had bosses who insisted on us using a co2 to blow out the control compartment of cob webs and dust, this was from an experience he had when a tech did a PM and the facilities guy opened the panel after him and seen it full of cob webs and concluded no PM was done. Blowing the control compartment out with CO2 can be a good idea but the problem is that if you are too close to the components or if its just too strong you can blow the springs out of the contactors and not notice. I have done this myself and its fine until it pulls in then its locked in and will not shut off. so, in short, you can actually cause damage if you mess with the unit too much. When checking charge on a Lennox with 4 compressors in a row , you notice the first compressor under charged and the last one over charged, because tech putting gauges on every summer and taking the charge from the first one and dumping it in the next because they don't dump the gauge charge back in when removing gauges.

[@aaronvigil9910]

Hey Jonny I’m looking to get into HVAC but more specifically HVAC Building Maintenance working at College doing HVAC is much easier/better doing than your typical residential HVAC? Thanks :)

[@johnnyb8629]

@@aaronvigil9910 it can be but it's facilities work. I expect you could run into PTAC units, small residential furnaces in dorms. You may see a lot of crazy disgusting shit, my brother in law did that very same work at Tulane University in New Orleans and some of his stories were bad. I personally wouldn't do that work. Depending on where you are in climate zone you might see some big steam or hot water boilers for radiant baseboard heating, but it will all be the same stuff over and over. Working for commercial contractor you see something new everyday, new and different equipment new and different problems and troubleshooting everyday. I've been working in Chicago my whole life and still run into new and weird stuff. The last thing I remember seeing that I had never seen before was a external motor compressor still using R12. Crazy huh.

[@aaronvigil9910]

@@johnnyb8629 Thanks for the quick reply! I live in Colorado. It’s kinda hard to tell. I’ll be on call every 9 weeks for one week. So that’s not too bad. Maybe just changing filters and stuff but yeah never thought of working on dorm rooms. Not sure if they have PTC or not.

[@HVACNOEL904]

prefect

[@chrisscerbo5731]

hey, what's your opinion on micro channel coils. I'm not a big fan, but would like to see what you think of them. no rush on reply

[@curioushvacguy6876]

Hey Chris- Im not a huge fan of them just because there so fragile, I prefer the old school beefy tube and fin coils myself but also I havent had as many issues with micro channels as most guys, I cant remember the last time I even had a leaking microchannel

[@sudeshputran69]

Super

[@dubaistories7154]

Very informative

[@sparkytech8787]

LOL common sense school love your vids

[@curioushvacguy6876]

Thanks, I think, lol

[@johnnyb8629]

Im curious, how do you do coil repairs when you have a condensing coil with a hot gas line that rubbed threw where it passes threw the metal tube sheet?

[@yzhang8629]

12:15 exhaust is close to the gas pipe, is it really safe?

[@Dave-dr4yy]

When your hat sticks to the fan on the top it’s probably about 200 cfm. 😂

[@henryesp9284]

How long does it take you to complete the maintenance?

[@curioushvacguy6876]

Really depends how in depth the customer wants me to go and how many units they have- but on average a really in depth summer pm with coil cleanings can take 2-4 hours per unit, but again theres alot of variables there

[@PBS-nm1uu]

Please do some troubleshooting of the circuit boards.

[@pabloantonio9507]

Badass

[@rono3045]

All that and you never changed any filters in the store or checked CFM

[@johnnyfair1005]

Lloked like it had a surveyor ems system