Welcome to the channel, I Started the channel to share my HVACR Service experiences. At 34yrs and counting in the trade with State Contractor License, there’s a mix of Commercial and Residential troubleshooting service work . Thanks for Watching Subcool HVAC!
Not really an hvac tech myself but mostly working on building automation projects yet I also do some service calls from a distance from my office to figure out what is going on. Fishing for information when dealing with problems is always a fun game. Steps I undertake: -Open the BMS and if there are GUIs created for the sector, open them and do a quick scan on the rooms of the building. Afterwards, narrow down the issue. Usually, i have dealt with lack of cooling on hot summer days, as opposed to the lack of heating during winter, for some reasons. Most of times they were RTUs feeding cool air to VAV damper boxes. The first thing I always notice is that all rooms fed by the same system are at least 2-3 °C above their setpoint (usually around 21-22°C), even if the customer tells you only a few are problematic (ex: 27°C, which is really hot). Either they genuinely had a mechanical problem that needed to be fixed, or sometimes it's just a case of undersized unit. If you see that the unit fails to maintain duct static pressure even when the fan is at 100% speed (because the room controls are all at maximum cooling demand and therefore, maximum airflow) or if all compressors are on and recently maintained but the air is still above 20°C, you can tell right away that the unit is undersized for the building's requirements. Sometimes I stumble upon autonomous units integrated on the BMS's BACnet network that generally give a lot of info, sometime I stumble across ones where we put our electronics on to control them and the equipments have feedbacks for a bunch of stuff (ex a current transducer on the power lines of the blower, compressor, etc...), and sometimes no feedbacks on the real state of equipments, mostly older installations. I have limited skills when it comes to troubleshooting machines physically, but whenever I can, I go fish for info for my colleagues who might be dispatched there.
Have have some really good content, u should consider gettin a tripod to show yr work/installations, I think that would be cool to see. Keep up the cool videos
Great work man. I wish they came out with that vacuum pump before I bought my Navac. They’re pretty awesome! I finally made my first heating and air video on my channel, hopefully I can reach a few people.
Carrier does have a service/tech bulletin on how to wire around the VFD. This unit appears to be cool only so low voltage control wiring you did should be okay. However, there is already a signal wire in the unit for this purpose, well it is there if there was no VFD. Also, I did not see that the wires ran through the fuses that are in the blower compartment. Maybe it is different on 460VAC, I don't think I have worked on anything over 240VAC that I bypassed the VFD on. The fuses are supposed to still be used but need to be changed to a different type. I usually run the yellow wires that are on the capacitor for the condenser fan motor directly to the contactor instead of to the capacitor. Just my OCD/thing to do.
I didn’t see fuses for the blower , the cfm relay is the weak link to the motors , the yellow motor leads remain energized through the cap common. They already have enough wires shoved into undersized contactors as it is 😂 Thanks for commenting
@@subcoolHVAC I run the yellows to the same side of the contactor as the common/yellow wire to capacitor is run from. If there is too much on there, they are not long enough or it is just easier then they stay on the capacitor. As for the fuses,, there is a block for them just above the VFD, at least on the units I have worked on. Again, maybe different on the higher voltage equipment.
I have a site with 32 carriers all 25 tons from 2020. We call it the Covid building. Numerous issues from factory that I caught on start up. Watch out for those insulated terminals for the drive. I had a few burn out on me this spring
I haven’t seen A2L compliant in writing on the Hercules but it has the features to be, DC Brushless motor, spark proof switch. Would need to verify with mfg. Thanks for asking!
Great job that surprised at they didn’t know chiller were off whole week or having problems l operate a #2 YK York 800 ton chiller we have alarm when chiller go off on an warning or any chiller pump and cooling pumps or any other problems we have the in the utility plant l guess that they doing a big project hated when they upgrade and the cause a problem due to the construction.
Yeah EMS doesn’t have alarms enabled at these sites during unoccupied or occupied times, building maintenance has to check physically… Thanks for commenting 👍
They're not the most powerful but the convenience of doing automatic ac jobs out in the field makes it priceless to me. No need for a generator, a converter or extension cord. I bought the 12ah battery so I'm curious how many cars i can do off it.
Only a good tech can make a repair. Any hack can take good equipment and through it in the junk . Those Rheem,Rudd, Weather Kings were good equipment .
Nice video, why didn't you diode test the 6 diodes in that bridge rectifier? A lizard alone wouldn't blow them high current relatively low voltages compared to thousands of volts lines. More than likely IGBTs are blown or the full wave bridge rectifier.
They may save money now, but the unit being that old, they will be paying a lot more in the long run due to it being less efficient and more leaks are likely to show up again before long.
Hopefully no fan, capacitor or compressor goes out in the near future they might blame it on you, usually no good deed goes unpunished, I've done a a couple of less expensive jobs to help a customer out and BAM! they call back that their water heater, on other side of house does not work a day after I repaired the a/c, this really happened to me, just told them to go kick rocks.
@@subcoolHVAC didn’t think about it for sound reduction. I asked so when I go in to clean I could address it at the same time if it had a negative effect. Thanks
Good work👍 but if the leakage is close to metal part of condenser. It is better to carefully melt the surroundings of metal part touching copper u and then solder copper part No callback no complains . I work as an hvac technicion in kuwait .
I didnt watch the video just because I dont find it interesting when you have worked on and replaced god only knows how many units but I did wanna say unless they are stupid rich they are always gonna wanna repair over replacing the unit. I mean I'm the type of guy if my compressor blows up I wanna buy a new compressor than a entire unit😂 **even tho I didnt watch the comment will still help with the algorithm
Love my Hercules vacuum pump I use it on ice machine and walk in coolers and reach in coolers and on ac units . It’s not the fastest but it’s light and works like it should. Half the cost of other brands and just as good with a 5 year warranty on tool and three year warranty on battery and charger
