Carrier 19XR Liquid Carry Over

[mot]

Centrifugal compressor Carrier 19XR we found liquid carry over in the suction elbow. We first tried to remove R134, about 100 kg.
We checked for excessive oil in the refrigerant. We checked the float valve we still have carry over and maybe, there is a problem with the distributer line in the bottom of the evaporator.
Any suggestions to assist us to resolve this problem would be welcome.

[cperk]

Centrifugal compressor Carrier 19XR we found liquid carry over in the suction elbow. We first tried to remove R134, about 100 kg.
We checked for excessive oil in the refrigerant. We checked the float valve we still have carry over and maybe, there is a problem with the distributer line in the bottom of the evaporator.
Any suggestions to assist us to resolve this problem would be welcome.

Where was ref. checked for oil? If on bottom evap. remember oil is going to be on the top of the refrigerant.

[servicetrane]

works properly, the oil return system, which operates the machine conditions?

[poppop]

You said you had "liquid carryover in the suction ell". Was the carryover causing problems? Amp fluctuation? What was the superheat reading?

The oil return system pulls oil from the bottom of the ell and returns it to the sump.

[milkyway]

perk., u said oil is on top of ref?? i thought oil is on bottom of barroll

[Carrene #2]

This type of thing kills me. Very few seem to know some basic principles.
Oil floats on water, right? Check out specific gravity of refrigerants in comparison to water. Then figure out where the oil will be.

Simple.

These damed things will slug liquid with a gallon of oil in evap.
Make sure the charge is correct and then go from there.
Let us know if you are unable to figure out how to determine if the charge is correct.

[milkyway]

This type of thing kills me. Very few seem to know some basic principles.
Oil floats on water, right? Check out specific gravity of refrigerants in comparison to water. Then figure out where the oil will be.

Simple.

These damed things will slug liquid with a gallon of oil in evap.
Make sure the charge is correct and then go from there.
Let us know if you are unable to figure out how to determine if the charge is correct.

ok ., then y on an rthc do they have a gas pump that takes oil from the bottom of evap and put back to sump due to oil migration??

[Randy S.]

Carrier skims oil from the top of the refrigerant level, and York Yts suck it off the lower part.

Anybody else ever scratch their head at that one?

[txhvac]

ok ., then y on an rthc do they have a gas pump that takes oil from the bottom of evap and put back to sump due to oil migration??

An RTHC is not a flooded barrel, it's a falling film. The refrigerant is metered in through the EXV @ the top, and sprayed over the tubes causing the liquid refrig. to FALL down over the tubes it will pool up at the BOTTOM of the barrel, keeping in mind the EXV is controlled by the liquid level sensor, it's not a deep level. The oil will fall down to the bottom, and is picked up by the gas pump.
The Carrier has a flooded barrel, where refrigerant is FLOODING the barrel keeping the tube submerged. Refrigerant is fed from the bottom of the evap. the oil is going pool up on the top. As mentioned before the Carrier XL/XR are SENSITIVE for oil log which will cause carry-over, something fierce.

[ChillerWisperer]

works properly, the oil return system, which operates the machine conditions?


Ummm...What?

[supertek65]

yeah
rthd is also falling film 2 eexv's

if you run cold condenser water even for a short tim
you will be pumping refrigerant back up from the bottom of the evaporator!!!!!!!!!!!!
using your shiny little g5 twin

[milkyway]

Carrier skims oil from the top of the refrigerant level, and York Yts suck it off the lower part.

Anybody else ever scratch their head at that one?



an rthd is a screw machine, where the carrier we are all talking about is a centrifugal same as york yt., is this the reason y oil is at top and not bottom due to the diff in styles? and when u say lower part of the york , r u talking about the bottom of the barroll of the york. also what exactly happens when u get liquid cary over in a centrifugal? eat up bearings?
:tank:

[supertek65]

alot of questions in one post

as you know the rthd is a falling film machine
the liquid comes in the top of the evap through two eexv's and the refrigerant falls to the bottom
there are two solenoid valves that return oil.


I am told they also have this on the new wheels so it does not matter that it is a screw or a wheel!

just about any other machine the oil that is not mixed in with the refrigerant
MISABILITY of the oils differ. will be on top. most all of the big chillers we have worked on in the past were flooded barrells!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

a float that controlled the liquid level.

so when you said earlier you thought the oil would be on top you would be correct.

like mentioned earlier carrier skims oil off the top.

as far as carry over, is what dx guys call liquid slugging.

I have seen some pretty good damage done to the wheel!






an rthd is a screw machine, where the carrier we are all talking about is a centrifugal same as york yt., is this the reason y oil is at top and not bottom due to the diff in styles? and when u say lower part of the york , r u talking about the bottom of the barroll of the york. also what exactly happens when u get liquid cary over in a centrifugal? eat up bearings?
:tank:

[svc]

yeah
rthd is also falling film 2 eexv's

if you run cold condenser water even for a short tim
you will be pumping refrigerant back up from the bottom of the evaporator!!!!!!!!!!!!
using your shiny little g5 twin

Smaller tonnage machines have only one eev. I havent seen what your second sentence is talking about. How can this happen. Typically cold condensor water would be handled by a condensor water regulating valve controlled by the CH530. Why would it stack ref. in the evap.