You are figuring your diff. oil press wrong. It's discharge press. minus the oil press. past the filter which looks like 193 here. Remember screw, NO OIL PUMP. 215-193 what do you come up with on #1? 221-211 what do you come up with on #2?
Originally Posted by davo
are you sure?????????????
discharge pressure?? not crankcase pressure???/ suction pressure??
oil pressure - crankcase pressure???
Originally Posted by cperk
true knowledge exists in knowing that you know nothing.
Those formulas are copied right out of the OM Manuals for this unit.
What you essentilly described is "filter diff Press".
The filter input transducer is located in the oil separator which is essentially the discharge pressure.
Oil separator level glass furthest to the right is at 1/2 glass.
I only added oil (1 gal) because it all washed out after maintenance added 125lbs r-22 to the system to try and raise the td. I removed the refrigerant and oil. (I actually measured it in a gallon container)
I can not assure the water will stay at or above 88 degrees because they do not have a tower bypass or boiler. The tower is 600 tons (Marley SS tower) while I only have 270 tons of chillers because there is process equipment hooked to the tower as well.
I did not see an oil injection on the compressor.
as there is no assurance that the water temperature is 88 ° f, set it the flow of refrigerant into the oil cooler to maintain oil temperature between 135 ° f 145 ° f, with this you decrease dp
Does this chiller ever run unloaded
This machine has the duplex oil filter, which has a commuter valve that is famous for excess pressure drop. What is your filter DP when you swap filters? You may want to consider installing pressure taps at the service valves on the transducers to verify all readings. Are you positive that "auto-zero" is enabled?
I thought he said screw not recip.
Originally Posted by supertek65
The duplex oil filter housings are crap. Had one with an original pressure drop of 14 PSIG without filter cartridges installed! The duplex housings have phased out with the style D YS and the main oil line diameter has been increased, wonder why? High refrigerant content in the oil makes it even worse. I would replace the filterhousing with one of the style D. This should eliminate the problem. Auto zeroing is recommended.
"Quality exists, when the price is long forgotten."
servicetrane: oil temp set to 135-140 degrees. will check this weekend. we will be in the low 60s at night.
jfridge: yes it does run unloaded in cold weather and the small amount of time they are closed.
cperk: this is a screw.
Klove & enyrope: filter dp is the same on both filters. they are both new, installed the day I started this thread.
I was wondering about the "Auto Zeroing" my self. Does anyone know how to check and see if it is turned on?
Thanks again guys!
remove checks from oil filters and lower head pressure before condemning balance piston,lower head =lower oil flow less oil flow = lower pressure drop
close oil feed line into side of compressor to cut back on mass oil flow. That oil is used for noise attenuation only
Hello guys,I just got a YS"D" style started up & it shut down on this same fault. Back story is chiller failed last year. Customer has rebuilt compressor and it faulted again. Hasn't run in a year,mostly due to other issues.
Long story short,I'm heading back Monday to check this valve and start chiller. Customer is ready to go forward with other work,but needs both chillers online . I'll keep you posted.
High head pressure will create high filter drop faults due to increased flow thru the filter when high head is present , can be due to many reasons , not enough flow thru condenser is one. York for some stupid reason doesn't require a flow switch on condensors.
May not be issue but worth considering.
Print out the factory log sheets that are in the O and M manual and have buildings representative log machine if possible.