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Originally Posted by
YORK134A
Hi everyone. Just wanted to introduce myself to the forum. I am an engineer at YORK with a focus on the YMC^2 machines. If you have any questions, or need parts/drawings let me know. I will be more than happy to help with these world-class machines. Also can answer or get the answer to any large tonnage units. We go big or go home 200-5000 RT.
Hello and greetings, I am fairly new here as well! Do you know if York has a buy-back program for used chiller parts? We've got a couple of 4000 ton Titan OM units and they've got massive control panels, compressors, motors and gear-boxes with them. Scraping the chillers themselves, but seems a shame scraping some of these other components if there's anyone out there, including York, who might buy them back or be used for parts. Happy Holidays!
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Soooooo......after finding the VDS Logic Board Power supply board bad (yes, the Q4 was burnt to a crisp), and replaced a bad Phase A IGBT Rectifier Board, everything powers up great and can do the 4 minute test. BUT THEN, when it tries to pre-charge, the Optiview will show the correct amount of amp draw on the screen. And then it throws up the DCCT fault on Phase C. New VSD Logic Board, all connections checked 3 times, wires ohm'd out, DCCTs rotated to see if it follows.....NADA!! Not working for JCI and having Bob or Andrew handy is not good. Any ideas out there?!?
We aren't service engineers, we are service re-engineers!! Work is what you make it, have fun.....
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Rotate the gate driver boards and ensure you have everything plugged in that should be, keeps the doors closed during testing, see how fast the DC buss rises on pre-charge.
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Hello i'm a new member to this forum.
Iam looking for overhaul manual for york yt. compressor.ydtj-67.
i believe it may be form 160.48.m1.
Any help would be greatly appreciated.
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Originally Posted by
raptyr
To be honest , particularly with the YMC2 you really , really need to be familiar , almost intimate in your knowledge and information before you attempt to work on that drive. You probably also need quite a few meters to capture and measure what is going off.
DCCT fault's are usually due to poor connections in the harness somewhere between the DCCT's and the VSD Logic Board.
Swap the DCCT's around while keeping the harness on the original phase and see if the fault follows the DCCT. If it does then it's the DCCT.
If it doesn't then either the harness or the logic board are faulty Bluestacks Kodi Lucky Patcher .
But first check all fuses , main and control to make sure they are ok and check you have 3 phase and current going to the Input Rectifier side, it may be that you have no power to that phase via the 1L and 2 L inductors.
Good luck
No issue jumping into these drives.....cut my teeth on the first Turbo Modulators, indeed, the initial ones York at any point made that were 4 cupboards of hardware
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Having an Evap low pressure fault and I’m trying to determine if the level control valve is commanding to the right position. After startup and running around 20% load the valve is roughly 6% open and the active level setpoint is around 36%. I have adequate water flow and doing an electronic leak search tomorrow to check for any leaks. I have a large Evap small temp difference(12). I have verified that the transducers are reading correctly, and at the time these numbers were gathered the suction/discharge pressures were 28/60 roughly with around 1 degrees of subcooling(134a).
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Please start a new thread.
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The physical liquid level in the condenser sightglass should be between 1/3rd and 1/2 the level setpoint on. The screen can be anywhere between 40-60% setting , it doesn’t really matter , what matters is the visual physical level in the sightglass is stable , if it is and the evaporator small temperature difference is more that 2 f then it is likely to be short of refrigerant, if you lower the condenser level setpoint by 10%?you will probably see the small temperature difference reduce , this would confirm that there is insufficient refrigerant in the evaporator, if it doesn’t reduce then dirty tubes waterside in evaporator but that is unlikely
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Thanks for the response, it looks like I have a sizable refrigerant leak on the drop leg. Can the drop leg be isolated with the king valve coming off the condenser and the modulating actuator going to the evaporator? I was curious if I could remove the valve and manually close the valve to the evaporator and then after I remove Freon from drop leg and make the repair I can open the valve on the evaporator back to the position of the actuator?
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Remove the actuator from the evaporator valve I meant*
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I didn’t see a setting to manually close the valve 100% from the optiview panel, it is currently at 30%.
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Originally Posted by
Bnhuskins
Thanks for the response, it looks like I have a sizable refrigerant leak on the drop leg. Can the drop leg be isolated with the king valve coming off the condenser and the modulating actuator going to the evaporator? I was curious if I could remove the valve and manually close the valve to the evaporator and then after I remove Freon from drop leg and make the repair I can open the valve on the evaporator back to the position of the actuator?
Why wouldn’t you pull the charge in order to see how much refrigerant you are short?
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I was trying to get away from having to pull the charge if necessary due to cost to the customer.
At this point since I know where the leak is I can isolate the drop leg, make the repair and then add charge.
With that being said I think I am going to quote to remove the charge, weigh the gas and then make repair. Was mainly looking for some confirmation since my previous experience with the YMC2 is limited, and wanted to make sure I wasn’t missing anything.
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Yes you should quote to remove charge weigh it and establish how is lost , typically you can lose about 40% before it starts to seriously affect and cause issues . Repair leak pressure test evacuate and recharge . The condenser level control can be accessed via the Condenser screen
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Thanks a lot for the feed back.
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What happens when a tube leaks and it fills with water?
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Could form rust. If not caught quick enough and chiller dehydrated rust could form. Rust could get to bearings and really screw things up. The tolerances on the magnetic bearings are tight.
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