ProblemCausesCorrective Action
Reduced or No Oil Feed to Compressor
Oil outlet valve closed or partially closed Open oil outlet valve
Inadequate oil charge in system Add oil in system
Oil float defective or dirty (will not open)
Disassemble and clean or replace defective float
component (flanged versions); Replace oil
separator (welded version).
Separator too small for applicationReplace separator with larger size
Hot Gas Entering Compressor Oil float defective or dirty (will not close)
Disassemble and clean or replace defective float
component (flanged versions); Replace oil
separator (welded version).
ProblemCausesCorrectiveAction
OilLevel To oHighInSight Glass
OMBout of calibrationReplace OMB
To omuchoil in system
Remove oilfromoil separatororreservoir until
properlevel is maintained
To omuchoil coming back from evaporator
Checksystempipingdesignfor:
-Propervelocities
-P-traps at thebottomofall suctionrisers
-Pipingpitched to compressor
-Overlappingordefroststhatare notstaggered
Debris undersolenoidvalve seat
Unscrewsolenoidvalve,clean &replace
ProblemCausesCorrectiveAction
OilLevel To oLow In SightGlass
Oilseparatororreservoir empty
Addoil to maintain aliquidsealinthe bottom of
theseparator or reservoir
Plugged oillinefilterReplace filter
Plugged inletstrainer(s) on OMBRemoveand cleanstraineronall affected OMB
Solenoid coil defectiveReplace coil
Powe rlosstoOMB Checkpower to OMB. Greenlight should be lit.
ProblemCausesCorrectiveAction
FoamingInSight Glass
Liquid refriger
antinoil
Flood back throughsuction;Increasesuperheat
on expansionvalve;Refrigerant condensing in oil
separator-add heater to oilseparator and/or
adjust system settingtoeliminate flood back
If so equipped,liquidinjection overfeedingCorrect liquid injectionoverfeed
Excess quantity of oilincrankcase Remove excess oil
ProblemCausesCorrectiveAction
Nuisance OilAlarms
"Filling"light remainsoneventhoughlevel is 1/2
above sightglass
ReplaceOMB
Alarmlight on allthe time ReplaceOMB
Intermittent oilreturnfromsystem
Checksystempipingdesignfor:
-Properveloicties
-P-traps at thebottomofall suctionrisers
-Pipingpitched to compressor
-Overlappingordefroststhatare notstaggered
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