Install Instructions

Kit ACB for Scroll Compressors
1. Assurethatthereisnopressureinthecompressorcrankcaseandun-
screwthethreadedttingattachingthesightglasstothecompressor.
Takenoteoftheoriginaloillevelsinceoilmaybelostwhenthesight
glassisremoved.Tipthecompressortoavoidoillossifpossible.
2. Reusetheoriginalsealbetweenthethreadedadapterandcompres-
sor.Withthethreeholeangeringinstalledontheadapter,screwthe
adapterintothecompressorandtorqueto18-22ft.-lbs.Takecarenot
toscratchtheO-ringsealsurfaceoftheadapter.
3. UsingtheO-ringandboltsprovided,installthecontrolunittothe
adapterange.Thetopofthecontrolunitmustbeperfectlyhorizontal
withtheoilinletttingtotheleft.Torquetheboltsto120in.-lbs.
4. Connecttheoilsupplylinetothe¼inchmalearetting.Acleanable
strainerisincorporatedintothetting.
5. MakewiringconnectionsinaccordancewithFigure1.
Important: The screw clamp style connector plugs used for the
power supply and solenoid coil must be unplugged from the cir-
cuit board to gain access to the wire clamp screws. Use a small
screwdriver to pry them outward.
6. Assurethereisproperoillevelinthecrankcasebeforerestartingthe
compressor.
FIGURE 1
ELECTRICAL WIRING DIAGRAM
Supply Voltage
Alarm Contact
to transformer
24 VAC/24 VA
to solenoid coil
(factory installed)
orange: common
red: alarm
brown: normal
24 VAC SOL
INSTRUCTIONS FOR FIELD CHANGEOUT OF
OMA TO OMB OIL CONTROL
Thisinstructionhasbeendevelopedtominimizedowntimebased
uponactualeldexperience.Readthroughtheentireinstructionbefore
proceedingwiththechange-out.
Tools Recommended:7/16"nutdriver;7/16"open-endwrench;
adjustablewrench;smallslottedscrewdriver;wirestripper;manifold
gaugeset;refrigerationvalvewrench(Additionalitemswhichmaybe
requireddependingonapplication:1'of¼"refrigerantgradecopper
tubing.2–¼"brassarenuts;aringtool;3/8"maleareby¼"female
areadapter;3-electricalwirenuts).
1. Disconnectallelectricalpowertothecompressor.
2. Safelyconnectgaugebarhosesinthefollowingsequence:discharge
linetobackseatportofanadjacentcompressorservicevalve;common
linetooilpressureportoncrankcaseofcompressoronwhichcontrol
istobechanged;suctionlinetosuctionmanifoldoncompressorrack.
(Manifoldvalvesshouldbeclosed.)
3. Closedischarge,suction,andoilfeedservicevalvesoncompressor.
4. Openthegaugemanifolddischargehandwheeltopressurizethe
crankcasetodischargepressure.(Important: Do not exceed
allowable pressure limits set by the compressor manufacturer
for the crankcase.)
5. Afterpressurizingthecrankcasetoasafepressure,closemanifold
gagedischargewheel.
6. Openthegagemanifoldsuctionwheeltoallowthehighpressureinthe
crankcasetometertheoilintothesuctionmanifold.
7. Aftertheoilisbelowthesightglassonthecompressorcrankcase,
closethesuctionhandwheelandsafelyreclaimtheremainingrefriger-
antpressureinthecrankcase.
8. Afterallthepressureisdepletedinthecrankcase,removetheexisting
oilcontrolasfollows:
 A. Disconnecttheelectricalleadsatthecontrolandlabeleachifwire
colorcodeschange.
 B. Removeexibleconduit(ifused)atthejunctionbox.
 C.Disconnecttheoilsupplyline.Note:Anewonemayneedtobefab-
ricated,oranadapterrequired,ifreplacinganOMAwithanOMB.
 D.Removethethreeangemountingboltswhichholdthecontrolto
theadapterandremoveexistingcontrol.
9. InstallsuppliedO-ringintheO-ringgrooveofthenewcontrol.Remove
"knockout"fromthejunctionboxofthenewcontrol.Onscrollcompres-
sors,installinjectiontubeperdiagram–notethatitinstallsataslight
angle(seediagram).Threadtubeinhandtightandtighten½turnwitha
wrenchorpliers.
10.Withthesolenoidoff,mountandlevelthenewcontroltoexistingadapt-
erusing(3)1/4"x20TPIx1"bolts.IfreplacinganOMAwithanOMB,
turntheringedadapterangeapproximately¼turncounterclockwise
toprovidethecorrectholealignmentfortheOMBsincetheholesare
notequidistant.(Important:Someolderrackshaveaangewithan
O-ringgroovemachinedinit.Replacewiththecorrectadapterforthe
application–seecatalog.)BesurethattheO-ringhasnotfallenoutof
thegrooveandtightenevenlyto40in.-lbs.
11.Reconnecttheoilinletline.
12.Withpressurevalvedoff,removegaugemanifold,capports,open
servicevalvesandcheckforleaks.
13.Reconnectelectricalpowerfollowingcolorcodeandinstallsolenoidcoil
andpowerplugs.Note:Donotenergizesolenoidcoilbeforereplacing
on enclosing tube.
14.CheckthatthegreenLEDison.YellowLEDshouldcomeonafter
about 10 seconds.
15.Checkthatthesolenoidisenergizedandthatthecontrolislling.
(Note:Ifcrankcasedoesnotllin2minutes,theredLEDshouldcome
on.)(Solenoidremainsontocontinuelling.)Ifthealarmtripsbefore
thecrankcaseislledto½sightglass,removeOMBpowerplugfor
severalsecondsandreinstalltoresetalarm.Compressorshouldthen
llto½sightglassandyellow"ll"LEDshouldgoout.
16.Restartthecompressorusingthereverseproceduretoshuttingit
down.
17.Recheckforleaksandrepairifnecessary.
Important: Injection tube is not used on reciprocating compressors
where the control is mounted directly to the crankcase.
LED Codes When Lit:
Green –24VACpowerissuppliedtoOMB.
Yellow –Floatsensordeterminedthattheoillevelhasbeenbelow
½sightglassforover10seconds.Fillsolenoidhasbeenactivated.
Red (continually lit)–Oillevelhasremainedbelow½sightglassfor
overtwominutesafterllsolenoidhasbeenactivated.Alarmhasbeen
activatedandcompressorispreventedfromoperatinguntiloillevel
reaches½sightglasswhenalarmautomaticallyresets.
Red (ashing)–Therehavebeenveautoresetalarmsregisteredwithin
a30minuteperiod.Alarmcircuitisnowlockedonandcompressorlocked
off.Fillsolenoidisde-energized.Alarmremainslockedinuntil24VAC
powerleadismanuallyunpluggedandagainpluggedbackintodevice.
Note: OMB units used on scroll compressors require the use of an
injection tube this tube is shipped wired to the unit but not installed.
It is to be screwed into the rear of the unit, and tightened hand tight
plus one half turn. When properly installed, the tube will be at a slight
angle relative to the OMB. See gure 2 below.
FIGURE 2
Note:Useofcrimptypewiringconnectorsishighlyrecommended.If
wirenutsmustbeused,tapingjointafterassemblywithelectricaltapeis
required.