two package units, Carrier and York, same building, no heat service calls.
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- เผยแพร่เมื่อ 5 ก.ย. 2024
- it's 4 degrees out and this building was said to have 2 units not heating. I make the first unit operational and order a circuit board before switching roofs. I find the second unit running in heat mode with no issues at first glance. after resolving some typical maintenance issues and verifying the heat is operating properly, the laboratory space is still cold, but why? the building recently had make up air units installed to help with the severe negative pressure that had got worse over years of adding exhaust. funny all these smart scientific lab guys and gals just kept adding exhaust without considering the negative pressure they were increasing each time exhaust was added, until the air conditioning and heating units could no longer keep up with the load. the make up air units solved their building pressure issues by providing neutral make up air, in this case heated to 70 degrees. there was a discrepancy between the units sensor maintaining 70 degrees and my readings inside at the register of 60ish degrees. the small roof top unit could not overcome this space being pressurized with cool air, slight adjustments solved our problem. Master of the obvious, being aware of the building as a whole and how it operates will make you a better service technician.
Thanks for taking us along, I don’t get to experience work in snow down South here. Stay warm Steve!
Thanks, Subcool!
Had lots to go through on this one....that place had the right guy for the job. I like those greenheck MUA'S as well. Nicely done as always brudda.
Thanks Jason!
Great job Steve stay safe.
Thanks, Jr!
Nice work Steve. Thank you for the knowledge.
Thanks Steven
Got your work cut out there steve ..and its freezing on that roof ..
Just make your list of bits for that faulty unit .
Looks like it has been playing up for a while .👍👍👍👍
Thanks, John! I made my list as quickly as possible 😆
Great job Steve. Hard ti run service when your hands are froze!Only happens like that when it’s extremely cold….equipment is bumping their design capacity.
That York unit sure needs new insulation & a re-glue job, didn’t even see where factory used any UL foil tape on the edges or corners inside.
Yeah, I think York probably had that at some point. It could be a chemical or something in the air breaking stuff down, it is a laboratory.
Great Video. Thank you for sharing
Thanks ZE
That old York looks like a perfect candidate for a replacement with an Addison-HVAC unit. They’re designed for labs and operating rooms.
Thanks, Farmboy! I'll have to look into that, it is about the right age, and I think R22.
Dang! That was one dirty coil
Yes, it was. Thanks, Curtis!
Nice job Steve-o ... Thx for sharing the wealth with our up and coming
Thanks, Eddy!
So many moving parts interacting with each other. Nice sleuthing. Thanks for taking the time to film and share even when you were freezing.
Thank you for taking the time to watch, I appreciate it Jay
Great video!
Thanks, r aeronca!
That was an interesting call, thanks for the video.
Thanks for watching David.
The reason the voltage kept dropping was there was some kind of internal short in the board in the ignition circuit causing high resistance causing your voltage to drop from 26 to 3 volts, new board and spark ignitor to be safe.
You're right! Thanks, Ryan. I actually came back that afternoon and replaced the board. there were no issues after that.
Yank the rest of the insulation off the top of that thing and glue a piece of foam board up there. That’s what I do for air handlers that got wet from a freeze up - foam board
Thanks, hvacmisadventures! That's a good idea
For the last 31 years I used to service antennas & satellite dishes on commercial buildings, and normally my repairs were fairly quick, especially during the winter months. I frequently thought about the poor hvac techs having to do a time involved repair with frozen fingers and toes.
😆 yeah, you gotta move quickly when it's this cold, but not too quick. The ice on the roof will slow you down enough. If it's a white roof, you're ice skating.
@@EverythingHVACR besides the wind and cold, nothing worse that a white rubber roof with fresh snow. If you even have a roof hatch, it’s on the opposite corner.
@chatrkat Facts! 😆 Thanks, chatrkat
Man those standing seam metal roofs suck to walk on will snow and ice on them.
No doubt, thanks, nonamesplease
Thanks for sharing. I'm still confused on why the makeup air was dumping 55-60 air into the building when it was set to 70. Is the air losing heat somewhere?
The sensor is mounted on the unit before any of the duct. It's also near the heat exchanger and could be reading off a few degrees. The duct is a long run as well.
Why do they put the roll out so far away from the burner, how does it trip the rollout being that far away?
I dont know the reasoning behind the location, but im sure the manufacturer has a reason. They trip at a lower temperature, I think around 150 degrees. They will trip, but more so, with the front plate deteriorating, it's amazing how bad the heat exchangers can get and still operate.
Im confused, why was the rollout tripping? Overheating?
The rollout did not trip. I was saying that with the front plate being rusted, it can cause roll-out switch trips and would be likely to trip after leaving. The rollout on these carriers is mounted up high, not directly by the burners. They trip around 150 degrees, I believe, and will not trip with the panel off most of the time, even when there is a problem.
I feel like the insulation deteriorated and sucked onto the evaporator coil
A lot of what was on the coil was aluminum from the insulation.
Bro are you from Texas or Georgia?
Kentucky