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.