York water cooled screw issues

[r404a]

MOD# YS DA CA S2-CJA SER# SAYM 912448


I punched tubes on the cond earlier this year due to high cond approach, current limit issues and oil filter warnings. Also changed the filter at that time. The filter I pulled was a 3 micron and I went back with a 12 micron, which york had listed as the right part. If anything, that would have alleviated premature clogging.
Machine ran for about a month and a half and then I got the call that facilities had to reset twice on clogged filter diagnostic. I ordered a new filter before going out and decided to start there. Went with another 12 micron filter and brought back online. Saw the warning a few times. Piped in brass "t" fittings at both transducers to get real time readings against 1 analog gauge- the pressures and pressure differential were identical to the ones read at the micro.
Basic running conditions: 44 leaving evap @ 65 psig suction/ 178 condenser pressure at 85 entering water@ 66 %RLA with 20 psid on the oil line. There is an oil solenoid and an oil cooler inbetween the transducers and I have no pressure tap between the two, but I am seeing almost no pressure drop across the filter itself.
I noted that the oil solenoid coil was getting very hot, 190 degress, and I changed it for good measures, to no avail. I don't see that 20 psid is so high, but york does. Any ideas?

[b-man]

r404a
How does the solenoid wire into the micropanel? On some later revs they go through a "military" style connector on the back of the panel. This style connector has mating pins. Sometimes the male or female pins don't seat properly in the connector and because of the vibration, it will drop out the solenoid. The transducers are on opposite sides of the solenoid and filters, so
the micropanel sees this as excessive pressure drop.
b-man

[r404a]

b man I will have to check that. thanks.


r404a

[r404a]

Oil solenoid hard wires to R/O board, verified good connections there and at solenoid, even min/maxed voltage at solenoid for a while. Voltage same at R/O as at the solenoid. for giggles, I remade the connections in the jbox,hot and neutral, incase something weird was happing, like dropping a neutral. Even changed the surpressor across the coil for GP.


r404a

[klove]

Don't know if you're still working on this one or already have it fixed, so I'll put in my 2 cents worth. This is an "A" style YS, which has rotor oil injection located about 1/2 way down the control panel side of the compressor. Problem is that because the injection port is not restricted to a max flow, the injection rate runs high and creates so much flow through the filter, the transducers "see" a high filter delta p, telling the machine that you have a problem. The remedy was to just plain shut off the service valve to the oil injection port (per engineering, there's enough oil pumping naturally to maintain rotor seal). If you're not comfortable doing that, front seat the service valve and then crack it off the front seat, start the chiller, and at constant load, play with the valve while watching filter drop. Go back to the 3 micron filter for the seals sake. Filter clean you'll probably run about 4-9 psid during normal operation (purely situational) with proper oil injection rate. All this being said, from what 2 points are you measuring your filter drop - are there a tap on the filter output line on this chiller? (And before anything else, be sure your transducers ain't lyin' to ya'.)

[r404a]

thanks for the input klove. looks like some good information here


r404a

[frick]

just leave it closed not needed and these machines have been plagued with oil problems,seporators fall apart from the inside ect.ect.ect. kinda like york J series compressors

[supertek65]

just leave it closed not needed and these machines have been plagued with oil problems,seporators fall apart from the inside ect.ect.ect. kinda like york J series compressors

do you mean all york water cooled screws?
or just this particular model?

frank