York Millenium Screw Chiller

[iceman007]

Does anyone have fault codes for one of these chillers. Apparently, the code is showing as Low curr/HP/MP fault on the status panel.

Thanks

(it's 2 screw compressors-one circuit is OK)

[al]

Iceman

no fault codes as such, what you see is what you get. this is a very common fault, covers motor overload(black box in compressor control cabinet0, high pressure cutout, 2 switches on compressor, one with recessed button even when tripped.
They had a problem with the star delta contactors "bouncing" on start up and tripping the unit out:D
Your start circuit is to the HP first i think
Hope this helps
AL

[iceman007]

Thanks for that. I have to go there tomorrow to look at it. Apparently it's been going on for some time. One of the previous visits had found some sort of problem with condenser fans I think.

Cheers

[jpumarada]

Low corrent/MP/HP is the most comon fault and is for 3 resson.
1.HP: High pressure in the sensor body of the compressor.
2. MP: Motor Protection Modules (2ACE) in the system Power Panel. This module protects against phase to phase current imbalance, over corrent, under current, phase rotation and thermal current motor overload protection.
Hope this help.

[Magic]

Hi Guys
This is my first time writing on this forum and i am a rookie working with industrial equipments. I was hoping one of you guys can explain to me which is the correct method to remove oil from a screw compressor from a york millemium chiller.This system also has two oil separators. I would really appreciate your help,dont know where to start.:confused::confused:

[iceman007]

Hi Guys
This is my first time writing on this forum and i am a rookie working with industrial equipments. I was hoping one of you guys can explain to me which is the correct method to remove oil from a screw compressor from a york millemium chiller.This system also has two oil separators. I would really appreciate your help,dont know where to start.:confused::confused:

Close the service valves, recover refrigerant and pressure the crankcase with nitrogen (just a few psi) and connect a line to the oil port, crack open the valve and derain the oil.

[Lowrider]

Close the service valves, recover refrigerant and pressure the crankcase with nitrogen (just a few psi) and connect a line to the oil port, crack open the valve and derain the oil.

That's taking the long road home!! Most don't even have service valves and you'll have to evacuate it afterwards!

Shut system down and turn off the power. Put a line from the separator to your recycle cilinder on the liquid valve. Take a second line from the vapour valve to your recovery unit and a third from the recovery unit back to the chiller. Put the cilinder on a scale and if it's not going up anymore , or it's going down you've recoved the oil without loosing next to nothing of the refrigirant charge. Do keep in mind that the cilinder will have to be large enough to hold all the oil. Then take a oil charging pump and pump in the amount of oil you've recovered and just a little more, not less, not too much. Be carefull not to get any air in it!!!!

Then put the cilinder upside down and blow the oil out, using ofn from the liquid side to the vapour side. Have the cilinder cleaned if the oil is really dirty or you can't get all out!

Good luck!

[iceman007]

That's taking the long road home!! Most don't even have service valves and you'll have to evacuate it afterwards!

Shut system down and turn off the power. Put a line from the separator to your recycle cilinder on the liquid valve. Take a second line from the vapour valve to your recovery unit and a third from the recovery unit back to the chiller. Put the cilinder on a scale and if it's not going up anymore , or it's going down you've recoved the oil without loosing next to nothing of the refrigirant charge. Do keep in mind that the cilinder will have to be large enough to hold all the oil. Then take a oil charging pump and pump in the amount of oil you've recovered and just a little more, not less, not too much. Be carefull not to get any air in it!!!!

Then put the cilinder upside down and blow the oil out, using ofn from the liquid side to the vapour side. Have the cilinder cleaned if the oil is really dirty or you can't get all out!

Good luck!

Out of interest, where would you connect the third line on the chiller, to the compressor ? or discharge line?

[Lowrider]

I usually do, or the condensor/liquid line.

[jpumarada]

Close the service valves, recover refrigerant and pressure the crankcase with nitrogen (just a few psi) and connect a line to the oil port, crack open the valve and derain the oil.

That procedures is OK, but always remained oil in the system, thi systems have 5 gallon of oil and for this procedures out only 3 gallon.
Now I connet a line to the oil port and with the compressor run open the valve and drain the oil, for this procedures out of compressore 4 gallon, don´t worry if compressor run with low oil, the protection stop the compressor.
After charge the oil (5gallon) and 1 hour after check the oil level and plug or charge if need.
This is may way to do.

[haitham_york]

, I have a question I would like to answer it. I want screw chiller replacing the entrance and exit of water from the right to the left. Is much as possible in the case of non-response please provide me the title of the York factory screw. thanks

[paulbraz]

I have had the same fault on a york YASX0331, low current /mp/hp. checked the two hp switches all the way back to the compressor terminal box, they are made. Motor winding thermistor seem fine... The CT has error codes saying 8 = phase loss (not true, all phases are there) 4 = Miswire (also not true) changed the CT over from the other circuit and the same faults come up. The windings on the compressor seem fine... Changed the compressor boards over then smashed my head up against a brick wall for about an hour and still no joy. No literature or wiring diagrams on site, called york's (johnson's) technical support, no answer, left a couple of messages (no reply, no shocks there then). There appears to be a main board and then a slave board above that, could it be either of those? Please, someone help, my head hurts!

[Yuri B.]

Dont know about that York, however, are all three phases present at exactly a/the controller's imputs?

[Entropie]

The three phase module senses current through the built in ct`s and transfers it as a 0-5V signal to the micro board. The only reason on a "good" module to trip on phase loss is, that there is no current sensed on one or two phases while the remaining one(s) do. Does the compressor start? How quickly after start does the problem occur? (refer to the fault history buffer). Have you checked the condition of the motor contactors (contacts), some might be worn out.

[Grizzly]

I have had the same fault on a york YASX0331, low current /mp/hp. checked the two hp switches all the way back to the compressor terminal box, they are made. Motor winding thermistor seem fine... The CT has error codes saying 8 = phase loss (not true, all phases are there) 4 = Miswire (also not true) changed the CT over from the other circuit and the same faults come up. The windings on the compressor seem fine... Changed the compressor boards over then smashed my head up against a brick wall for about an hour and still no joy. No literature or wiring diagrams on site, called york's (johnson's) technical support, no answer, left a couple of messages (no reply, no shocks there then). There appears to be a main board and then a slave board above that, could it be either of those? Please, someone help, my head hurts!


Entropie may be onto something check your HP switches again.
One of the to ground will play havock with the 5v supplied!
Grizzly

[Magoo]

RF noise can also upset the processor, check grounding of each sensor. Also CT's can go out of balance.
magoo