HT (R-11) Oil Loss Problems

[uni-ted]

HT (R-11) Oil loss problem

I add 3-4 gallons of oil to lower sump, Upper sump is full of oil. Let warm up .Start up under good load After twenty to thirty minutes trips on low oil pressure. No oil in lower sump. Is it the solenoid on the jet pump leaking by or internal bearing problems?

[cperk]

HT (R-11) Oil loss problem

I add 3-4 gallons of oil to lower sump, Upper sump is full of oil. Let warm up .Start up under good load After twenty to thirty minutes trips on low oil pressure. No oil in lower sump. Is it the solenoid on the jet pump leaking by or internal bearing problems?

Assuming this machine is low press. does it have a hydraulic purge using comp. oil?

[servicetrane]

reviews the eductors. dehydrators and filters

[cperk]

reviews the eductors. dehydrators and filters

If he had an oil return prob. I would think it would run longer than 20 or 30 minutes before sump goes dry.

[servicetrane]

if the machine works at low partial loads and eductors are lost quickly clogged the oil level another detail that your water temperature at the condenser low

[stickerhead]

HT (R-11) Oil loss problem

I add 3-4 gallons of oil to lower sump, Upper sump is full of oil. Let warm up .Start up under good load After twenty to thirty minutes trips on low oil pressure. No oil in lower sump. Is it the solenoid on the jet pump leaking by or internal bearing problems?

Could be low on charge and the oil scavanger of the evap is not working. I have had the jet pump washer inside the jet pump stick. If it has a turboguard purge, valve it off and see if it maintains a level. If it does, the foul gas check valve is bad.

[cperk]

if the machine works at low partial loads and eductors are lost quickly clogged the oil level another detail that your water temperature at the condenser low

Huh??:confused:

[stickerhead]

if the machine works at low partial loads and eductors are lost quickly clogged the oil level another detail that your water temperature at the condenser low

Do you even know what brand a HT is?

[cperk]

Could be low on charge and the oil scavanger of the evap is not working. I have had the jet pump washer inside the jet pump stick. If it has a turboguard purge, valve it off and see if it maintains a level. If it does, the foul gas check valve is bad.

I think your dead on, on the latter statement, that is if oil is still in machine and not coming out of purge exaust.

[servicetrane]

centrifugal compressor?

[heavymetaldad]

ding ding ding!
:couch:

[pringlel]

One of the main things to check is your check valve on your purge.

[uni-ted]

No it does not have a hydraulic purge it has been upgraded to a Redi purge

[uni-ted]

Could be low on charge and the oil scavanger of the evap is not working. I have had the jet pump washer inside the jet pump stick. If it has a turboguard purge, valve it off and see if it maintains a level. If it does, the foul gas check valve is bad.

I am from Toronto Canada, These old R-11 machines will be gone later this year. Just trying to make it through a hot summer. I will take everybodies suggestions and get back to you (uni-ted)

[cperk]

No it does not have a hydraulic purge it has been upgraded to a Redi purge

Ohh! O.K.

[allchlrstech]

Check your sump float and oil return solinoid of your automatic oil return.
If your condenser valve to your oil return system has been shut off and your oil return solinoid is not shut off then it will dump your oil charge to the evap.
also if the solinoid is not holding, your oil will drain when off.Since a HT's motor is refigerant cooled your oil loss may be to the motor (shaft seal and bearing seals).Do you have good oil pressure after you aux oil pump shuts down?Does your motor cooling return line feel warm.Bring it to a slight positive and see if you get oil from the motor cooling return line.The oil circuit to a HT is kind of complicated,it has two shaft driven oil pumps a jet pump a aux oil pump 6 bearings oil cooler, check valves jet pump solinoid,oil return solinoid,oil sump float,LP shaft seal and bearing assoc seals several tees that make it kind of confusing when you look at it.Good luck.

[ga1279]

If you're planning on replacement, of the chillers, in short order then eliminate the sump float switch and the solenoid valves. Just make it a constant oil recovery. Make sure your eductor is clean and the filter drier is clean. That should bring your oil back. Keep a good load on the evaporator also. There should be a sight glass in the line somewhere so you can observe recovery action. -GEO

[stickerhead]

Most of the oil level floats were jumped out but check it anyway. Look at the sightglass on the end of the machine. If it looks like beer foam, it's oil logged. They should run refrigerant just over the top of the tubes at full load with no foam.

[Warmaire]

Everyone seems to be giving you good advice. However what temp are you running chilled water at?? You also can raise the Temp a little and it will help get your oil back from the evaportor, I found that keeping my chilled water temp around 48 degrees works good for me. I have VFD drives on the towers which helps in maintaining 76-78 degree condenser water supply. Your loads are super important as I'm sure you know be sure that all your strainers are clear at your Fan coil units, goodluck. oh ya by the way bypassing safeties is a bad idea don't do it. and once your loads are up(hope you have normal water flow through your tubes) you will find that you may have to take oil back out. Again Goodluck Your Brother From Another Mother
Warmaire