YORK PACKAGE UNIT NOT COOLING

This was a service call on a York Package unit not cooling, I found that the unit had a bad thermostat and also found that the thermostats were mislabeled. I replaced the stat and corrected all the thermostat labeling.
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[@dwarden3]

I worked at an apt complex, and they had 12 condensers on one end of the bldg. Every one of them were labeled wrong, tstat wires to wrong units and whips were all wrong as well. Took about 3 hours to correct it all. While I was working on it some of the residents came out to "watch the show" from my cussing the installers, they were wondering why they had $300+ electric bills and some had $50 bills. I let the manager explain it to them. It was also only about six month old property, I told her this should all be under warranty but it was Friday evening and you know how that goes. I'm really enjoying the videos!

[@PhaseConverterampV]

I’m employed as a mechanical designer. I’m pretty used to negative complaints. These videos are gold though since I listen better when complaints are constructive. It’s hard to foresee all of the issues that may occur, after the unit has 10+ years in service in an unknown temp/relative humidity, installed by unknown tech. Thanks a lot for making these videos.

[@julesc.9449]

Here's why you saw 24V on Y1 and Y2 with the thermostat wires disconnected from the York board. The thermostat is very most likely using triacs instead of small relays to switch the 24V signals. A triac does not act as a switch or relay where it completely disconnects the output from the input. It only increases its resistance so as to prevent sufficient current from activating the load. I believe that a non energized triac has an impedence in the range of 40 Megaohms.

[@ElmerCat]

Apparently, the mislabeled and malfunctioning thermostat was acting like camouflage, effectively thwarting the Predator.

[@brentaudi9354]

Great Detective Work!! It is kind of funny thinking about these mislabeled t-stats and the trouble they caused. People complaining that the room is freezing while the servers go and adjust the units heat setting for another room where the guest are all complaining about how hot it is in that room. Could be a great comedy skit.

[@KaesOner]

You should get a meter with a Low impedance input function (Lo-Z). Fluke have good ones. That way you will be able to save time troubleshooting and confirm whether a wire has ghost voltage present just like the Cool (Y) cable did in your video, whether it be capacitive coupling voltage or voltage from a triac. A normal high impedance volt meter will always pick up ghost voltages, which is why i have a dual impedance meter for these type of scenarios as seen with the disconnected thermostat wiring.

[@watermanone7567]

Great find: Miss-labeled stuff can drive you nuts. To bad some installers don't seem to care and just slap numbers on equipment. Thanks for that great video. P.S. I had a restaurant that had two three phase electric water heaters that would not keep up to the demand of the dishwasher. I found that they were on a 208 volt three phase system and the elements were 240 volts. The loss of voltage doubles the loss of wattage. Installed the 208 volt elements and not more issues.

[@timothydelgado4907]

After a long day of studying and having lecture I spend every free minute watching your videos

[@karizmatic5]

That's TRICKY! Good Find.

[@SoCaL884]

Good catch on the transformer!

[@rogerf3622]

Great video as usual. But “very high humidity here at 50-55%” had to make be chuckle. Today in Florida the humidity is 83%...hold my beer.

[@htownelectrican]

Great troubleshooting!!! From a sparky!

[@atouchofa.d.d.5852]

Whoever put the alarm stuff inside those units is a genius! I need to do that!

[@Theoldchum]

Hey Chris, my bet is that thermostats were swapped by other technicians on previous service calls and the banquet room wasn't being used at the time so that's where the broken one was parked instead of the technician just taking the time to get a new tstat and base and doing the install. The labeling would be better placed on the wall, not on the tstats.

[@knockitofff]

11:54

[@eggman9713]

I have mixed opinions on Dedicated Outdoor Air Systems (DOAS) for tempering outdoor air separate from the main space conditioning. It is required in some cases here in Washington, but it does add more components, ductwork, and system complexity that can confuse building owners and maintenance staff, leading to more issues down the road. Having a simple RTU, fan coil, split unit, etc. with a properly functioning economizer is still the simplest way to bring in normal amounts of outdoor air. DOAS has its place, and as a design engineer I have done them plenty of times, but they don't always make sense. Love the videos!

[@HVACChillin]

Honeywell will forever dominate the thermostat market. Good diagnosing

[@MatthewMattoxcube8021]

This video shows the importance of label everything and make sure your label are clear and correct. I have seen so many issues and outages caused by someone mislabeling something.

[@kylebrubaker5924]

YORK Air handlers are very reliable. My company has dealt with them for years, and I can say from first-hand experience that they are great. They offer unbeatable competitive pricing and have amazing quality with an awesome Customer support team, as well as, technical team.

[@wpl11972]

I know this video is two years old. Good job on thermostat tap. I always make sure the thermostat is set right.