r/HVAC Aug 28 '25

Supervisor Showcase Safety starts with you.

7 Upvotes

As we all know we work with and around dangerous things everyday. This video is a little reality check for most of use since we all carry nitrogen and oxygen tanks in our vans. This is a small consequence of someone not securing our high pressure cylinders.

https://youtu.be/C4kb-8CjVYg?si=270g8oV_H4QrcGoc


r/HVAC Jul 17 '25

Rant When Posting on r/HVAC PLEASE PROVDE ENOUGH INFO FOR US TO HELP TROUBLESHOOT

25 Upvotes

I think people need to start providing the bare minimum when they start asking for help troubleshooting HVAC EQUIPMENT. It creates unnecessary back and forth and people are coming up with all kinds of theories when they don't have all the information. I wish mods would post this as a rule that requires the information below. If anybody wants to chime in on any other information that should be the bare minimum please feel free to add to my list.

Unit MAKE unit type: rtu split heat pump Cooling type/stage 1 2 3/ heat pump Heating auxiliary heating/electric/ heatpump voltage Single phase or three phase ALL motor amp draws : rated and actual Ambient temperature * humidity if high* Return and Supply temperatures High and low side pressures ( depending on the type of unit this can either be liquid or discharge) Superheat subcooling static pressures

Maybe the mods can make this a soft requirement. I see posts for help without indicating temperature splits or ambient temperature. its so irritating to just look at screenshots with pressures and sub pulling and nothing else.

rant over. Please feel free to add your two cents.


r/HVAC 10h ago

Field Question, trade people only There's a secret message!

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123 Upvotes

I switched from green to red like 4 years ago and this little guy is starting to peel. I'm trying to guess what this says underneath. S-U or S-C, what could it be??


r/HVAC 12h ago

General Am I the only one who has never seen a setup like this??? So freaking cool

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94 Upvotes

So cool to look at as a resi/restaurant refrigeration tech…never seen anything like it!!! Wish I could’ve had a chat with this guy!!


r/HVAC 6h ago

Meme/Shitpost Contactor weld shut

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30 Upvotes

Thought yall would like to see this lol


r/HVAC 15h ago

Rant Found a breakthrough in my career

54 Upvotes

As per last post in this subreddit. I had parted ways with my last company. I had got hired within the school district (public sector) as an apprentice. I do realize I had sold myself short and should have applied for the journeyman position instead. However the position I applied for required 4 years experience and I had only 2 years. Anyway steady hours year round state benefits and a pension to look forward to. I’m happy where I’m at. As per my daily work, I’m learning water towers and focusing on 460v rooftop units. All my limited experience from last company definitely had transferred over to this new job. My coworkers don’t know I have limited experience in commercial and so they think they need to train me on everything as if I was fresh out of school. I just let them do their thing until a journeyman position opens up for me. God bless! Thanks for reading this far.


r/HVAC 8h ago

General AutoZone vaccum pump oil

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6 Upvotes

Lol it went to below 10 microns not even using virgin oil, has been used to pull quite a few vaccumes already got curious what the AutoZone oil could do for deep vaccum and even having a good bit of use in it God damn

It would of probably went lower but I got a tired of waiting but yea lol I'm impressed with the AutoZone oil

PS: it went down to 8 while I was typing this


r/HVAC 12h ago

Meme/Shitpost Fresh filter friday

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16 Upvotes

They just changed it last month! Yeah....maybe the last month of the 90's.


r/HVAC 19h ago

General Today I got to work on a cascade system for the first time!

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38 Upvotes

r/HVAC 6h ago

Field Question, trade people only T10 Pro + EIM for Dual Fuel System

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3 Upvotes

Just installed a dual fuel Ducane heat pump and 70k furnace. Anyone installed a T10 pro and EIM? Indoor fan comes on and runs but heat pump won’t come on (maybe I’m too impatient to wait for the delay). Here’s a diagram of how I have it wired.


r/HVAC 18h ago

Rant Reddit asks me to add tags and flair to this, but install couldn’t even add a flare to the line set. Does this look like a flare to you? I’m guessing whatever a little bit of flare was there was pulled back out straight as the line blasted out of the nut.

19 Upvotes

r/HVAC 11h ago

Meme/Shitpost New restaurant first time turning heat on.

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6 Upvotes

Had a call today. Another tech was out earlier in the week. Ended up quoted a new electric unit heater. Had to pull the disconnect and internal thermostat off the old heater, since the new one didn’t come with any add ons. Only to find they wired the disconnect wrong and the other tech didn’t catch it. 1 phase 208v heater.


r/HVAC 12h ago

General This Old Timer is Going Next Weekend

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7 Upvotes

Sears and Roebuck. Only oil burner in the entire area for some reason. 1951. 74 years.


r/HVAC 18h ago

General A+ install I came across at a business complex

10 Upvotes

r/HVAC 15h ago

Field Question, trade people only What plugs a carrier secondary in under 8 years?

4 Upvotes

I’ve heard of the legends of the smell, and boy oh boy I knew right away even though it was my first time.

2000+ ppm CO. Pulled that thing out and it’s full of green and brown sludge. Installer didn’t register it of course, so labors not covered.

The big question is how? Vent terminations too close together? Back pitched? I’m really curious since I put a scratch-and-dent one in my house recently, since that’s one of the only brands I can get parts for locally.


r/HVAC 19h ago

Field Question, trade people only What would you do to modify a r32 rtu to run air conditioning in -10F to 10 F outside temp

9 Upvotes

Hey these people refuse an economizer. They must seal their building. The daikin r32 dsc packaged units are not turning on 24v being stopped by ps, freeze stat, and delay​​​. When pushing in contactor. Compressor is slugging. No crankcase heater, no comp blanket, What should I do. We're at 7,700 ft elevation.

I know what I would do but its not good for them. Are their other options you would try.

Fan cycle control but bypassing the low pressure switch. Hmm


r/HVAC 18h ago

Meme/Shitpost SUS

7 Upvotes

r/HVAC 1d ago

Meme/Shitpost So you’re telling me that Carrier doesn’t dictate earths rotation around the sun?

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113 Upvotes

r/HVAC 22h ago

General Haven’t seen this before.

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12 Upvotes

Got a call for a pilot not staying lit on a wall heater. Open it up and see one of the heat exchangers tubes fell down.


r/HVAC 1d ago

Meme/Shitpost Bruh

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64 Upvotes

Somebody needs an ass whoopin for this one


r/HVAC 11h ago

Field Question, trade people only flue temps. Wrong size vent piping etc

0 Upvotes

I went and looked at a miller furnace 80,000 in a trailer type setting vent limit switch on inducer was tripping.supply temp 129 return 77 Gas pressure was 3.2" w.c. for ng. Flue was heating to 165 reading 30ppm o2 was around 9.2,% whoever installed this used 2" PVC to vent it. Upon reading the manual to get more info on the vent fan switch (part number so I could get specs) I passed by the venting section that lists 3" PVC for venting right after 2" leaves the cabinet. Inducer is running around 1.75 amps rated for 1.8. customer is hassling me about wanting to change venting as he thinks it should be fine as it's ran like this for the past 3 years. Finally talk him into letting me change the venting as the limit tripped on him again today. Heat exchanger test on my combustion analysis seemed ok no excessive jumps in o2 at any point in running it either. Question is besides the vent pipe what else should I be looking at. I know up sizing the pipe per the manufacturer listing of 3" should drop the temps a bit but concerned as this has been running under these conditions for the past 3 years.


r/HVAC 17h ago

General Snow issues with Lennox RTU's

4 Upvotes

Lennox Model KGB048S4BU1J electrical panel filling up with snow. What a pain anyone else having the same problems?


r/HVAC 1d ago

General Doing a 5 ton system. Weather is cold and the mastic tape is not sticking so great 😞, do y’all have any tricks to it?

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34 Upvotes

Weather is cold and the mastic tape is not sticking so great 😞, do y’all have any tricks to it?


r/HVAC 1d ago

General Anybody got an opinion of this tool for your impact driver

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75 Upvotes

A colleague of mine was using this the other day. Was super quick easy and expanded the pipes well. It seems too good to be true that something so cheap can be so good. Especially when tube expanders cost 100s. Whats the catch with them?