ReplyWhich circuit is this on and what is the alarm number/code? And do you have a short chilled water loop?
Regular Guest
I am working on a Carrier screw chiller that keeps triping on low oil pressure. I have already changed internal and external oil filters and their has not been any leaks on chiller since startup but it does not do it all the time
Model #
30HXA126RZ-600BA
Serial #
1398F33837
Here are the last reading I took
Percent 100%
Discharge 178
Suction 29
Oil Pressure Differental 118.1
Oil Pressure 174
Discharge Gas Temp 156 F
Motor Temp 186 F
SAT Condensing temp 123 F
SAT Suction Temp 32.7 F
EXV 35%
Cooler Level 2.1
Econ. Pressure 52.8
EWT 52 F
LWT 47 F
ANY IDEAS???????????
Professional Member*
Which circuit is this on and what is the alarm number/code? And do you have a short chilled water loop?
Professional Member
I have one doing this but have not had the opportunity to change filters. I am interested in what you find.
What we have here, is a failure to communicate........
Professional Member
How long does your external oil pump stay on after the compressor starts? It might not stay on long enough to get the needed evaporator lift for system oil flow.
"Nearly all men can stand adversity, but if you want to test a man's character, give him power."
-Abraham Lincoln
Regular Guest
this chiller is setup on a proccess loop that is running 5 extruders. It is about a 400 foot loop the code is 40 Compressor A1 Low oil Pressure.
Regular Guest
It runs about 30 seconds after compressor is started but would that generate a pre start oil pressure problem
Professional Member
That's not what I was getting at. It is possible that the problem occurs during the first start up of the day when the ECW and LCW is below normal, not supplying enough lift to push the oil. This only happens for a brief period of time, till the circuit starts to stabilize. Try increasing from 30 seconds to, say 40, for starters and see how it goes from there.
"Nearly all men can stand adversity, but if you want to test a man's character, give him power."
-Abraham Lincoln
Professional Member
You have a 15F evap approach which is way to high at 100% load, along with a 5 split. Do you have fouled evap tubes? EXV is on the low % end for being open at full load. Are you running glycol or water thru the evap?
To much work with too little time!!!!
Regular Guest
we had a eddy current test run two months ago came back good and they are using water
Regular Guest
I will try to increase that monday and see from their
THANKS FOR THE HELP
Professional Member*
I don`t think you can change the pump time if the pressure is too low it know`s what to do i.e. truogh the psio logic. Do you have motormasters on the condenser fans? Pressure switches ok?
Professional Member*
Also that looks to be a series 0 does it have a history of oil alarms and what version of software do you have?
Professional Member*
series 0 with pic controls. Hum? May need to check/calibrate all of the pressure transducers.
Professional Member*
Calibrating transducers man can that go wrong. Takes a liitle practice to get it down.
Professional Member
The O & M is must for stuff like this.Originally Posted by thegoodlistener
"Nearly all men can stand adversity, but if you want to test a man's character, give him power."
-Abraham Lincoln
Professional Member*
No not really. Unplug wiring from all transducers. Remove all Transducers. Plug wiring back in to all tranducers. Go to calibration menu and calibrate all transducers at one time. All should read 0 psi. Reconnect all transducers and you are done.
Professional Member*
Just saying that first time is a doozy when you don`t have a manual...a good tech is all about fixing your own screw-up when the need arises, those controls are also tempermental ???On these machines anything can happen especially a series 0.
Professional Member*
I agree, a manual is a necessity when working on these machines. A system pilot is also helpful when plugged into the machine so you don't have to squat down to operate the handicap acessible lid keypad and you can view multiply items at one time.
Professional Member
Exactly what is explained in the manual. Some guys have great memories, I'm not on of them. Have your references in order, before you start the job.
Just my two cents.
"Nearly all men can stand adversity, but if you want to test a man's character, give him power."
-Abraham Lincoln
Professional Member
First off I would double check all temps with a temperature probe. If you still come up with 15 deg approach then brush the tubes.
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