Harbor Freight Tools R134A User manual

R134A
Harbor Freight Tools
Brand
Harbor Freight Tools
Model
R134A
Category
Power drills
Type
User manual

Harbor Freight Tools R134A is a professional-grade manifold gauge set designed for automotive air conditioning service and diagnostics. It features high and low-pressure gauges with +/- 2% accuracy, allowing you to monitor and adjust refrigerant pressures precisely. The color-coded hoses (blue for low-pressure and red for high-pressure) and quick-disconnect valves ensure easy and secure connections. The sight glass enables you to check the refrigerant's condition, while the included storage plugs protect the gauge's fittings.

Harbor Freight Tools R134A is a professional-grade manifold gauge set designed for automotive air conditioning service and diagnostics. It features high and low-pressure gauges with +/- 2% accuracy, allowing you to monitor and adjust refrigerant pressures precisely. The color-coded hoses (blue for low-pressure and red for high-pressure) and quick-disconnect valves ensure easy and secure connections. The sight glass enables you to check the refrigerant's condition, while the included storage plugs protect the gauge's fittings.

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Specifications
Blue(Low)Gauge 0-120PSI
BlueHose
1
/
4
IN.FFLx4FT.9IN.
Red(High)Gauge 0-500PSI
RedHose
1
/
4
IN.FFLx4FT.9IN.
YellowHose
1
/
2
IN.ACMEx4FT.9IN.
GaugeAccuracy +/-2%
SetincludesQuickDisconnectValves
WARNING! ONLY USE R-134a REFRIGERANT WITH THIS A/C MANIFOLD GAUGE SET.
Safety Warnings
WARNING Read all safety warnings and instructions.
Failure to follow the warnings and instructions may result in serious injury.
Save all warnings and instructions for future reference.
1. Keep work area clean and well lit.
2. Keep children away.Childrenmustnever
beallowedintheworkarea.Donotletthem
handletheA/CManifoldGaugeSet.
3. Therearecertainapplicationsforwhichthis
A/CManifoldGaugeSetwasdesigned.
Itwilldothejobbetterandmoresafely
attherateforwhichitwasintended.
DonotmodifythisA/CManifoldGaugeSet
anddonotusethisA/CManifoldGaugeSet
forapurposeforwhichitwasnotintended.
4. Dress properly.Donotwearlooseclothing
orjewelryastheycanbecaughtinmoving
engineparts.Protectiveclothesandnonskid
footweararerecommendedwhenworking.
Wearrestrictivehaircoveringtocontainlonghair.
5. WearANSI-approvedimpactsafetygoggles
andheavy-dutyworkglovesatall
timesduringsetupanduse.
6. Do not overreach.
Keepproperfootingandbalanceatalltimes.
7. Maintain gauge with care.Keepthe
A/CManifoldGaugeSetcleanforbetterand
saferperformance.Inspecthoses
periodically,andifdamaged,havethem
repairedbyaqualifiedtechnician.
8. Stay alert.Watchwhatyouaredoing,
usecommonsense.Donotoperate
gaugewhenyouaretired.
9. Check for damaged parts.Beforeusingany
gauge,anypartthatappearsdamagedshould
becarefullycheckedtodeterminethatitwill
operateproperlyandperformitsintendedfunction.
Checkforalignmentandbindingofmovingparts;
anybrokenpartsormountingfixtures;andany
otherconditionthatmayaffectproperoperation.
Anypartthatisdamagedshouldbeproperly
repairedorreplacedbyaqualifiedtechnician.
10.Replacement parts and accessories.
Whenservicing,useonlyidentical
replacementparts.Useofanyotherpartswill
voidthewarranty.Onlyuseaccessoriesintended
forusewiththisgauge.Approvedaccessories
areavailablefromHarborFreightTools.
11.Do not operate gauge if under the influence of
alcohol or drugs.Readwarninglabelsiftaking
prescriptionmedicinetodetermineif
yourjudgmentorreflexesareimpaired
whiletakingdrugs.Ifthereisany
doubt,donotoperatethegauge.
12.Maintenance.Foryoursafety,
serviceandmaintenanceshouldbe
performedregularlybyaqualifiedtechnician.
13.Industrial applications must follow
OSHA requirements.
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14.People with pacemakers should consult
their physician(s) before using this product.
Electromagneticfieldsincloseproximity
toaheartpacemakercouldcause
interferencetoorfailureofthepacemaker.
Inaddition,peoplewithpacemakersshould
observethefollowing:Cautionisnecessary
whennearthecoil,sparkplugcables,
ordistributorofarunningengine.
15.WARNING:Thebrasscomponentsof
thisproductcontainlead,achemical
knowntotheStateofCaliforniatocause
birthdefects(orotherreproductiveharm).
(CaliforniaHealth&SafetyCode
§25249.5,et seq.)
16.Thewarnings,cautions,andinstructionsdiscussed
inthisinstructionmanualcannotcoverallpossible
conditionsandsituationsthatmayoccur.Itmust
beunderstoodbytheoperatorthatcommonsense
andcautionarefactors,whichcannotbebuiltinto
thisproduct,butmustbesuppliedbytheoperator.
17.ONLY USE REFRIGERANT R-134a WITH
THIS A/C MANIFOLD GAUGE SET.
18.Do not start an engine in an enclosed area
(like a garage). A running gasoline engine
generates carbon monoxide; carbon monoxide
is a colorless, odorless gas that can cause
serious injury and death, if inhaled.
19.Keep hands away from the moving parts
and hot parts of vehicle’s engine.
20.Read and understand all instructions
and safety precautions as outlined in
the vehicle manufacturer’s manual for
air condition servicing. Only qualified
mechanics that are trained in servicing air
conditioning systems should use this product.
21.When warming up an engine in preparation
for checking of the A/C system, make sure
the vehicle’s transmission is placed in “Park”
and the emergency brake is applied.
22.Refrigerant can cause severe frostbite if it
comes in contact with skin.
Follow the safety warnings and instructions
provided by the refrigerant manufacturer.
23.Do not disconnect any pressurized hose.
Pressurizedrefrigerantcancausesevereinjury.
24.Use caution when opening an air conditioning
system line or can of refrigerant.
Whenchecking,alwaysplaceatowelaround
theservicevalvesoftheairconditioningunit
andRedandBlueCouplers(22and23).
25.Keep refrigerant away from excessive
heat as pressure in the container could
increase enough to rupture the can.
26.Do not discharge refrigerant into the
atmosphere. Capturerefrigerantintoan
approvedrecoverycontainer(notincluded),and
thendisposeofproperly.Contactyourlocal
HazardousWasteAuthorityfordisposalguidelines.
27.Only use refrigerant in a manner
consistent with the air conditioning
system’s repair manual.
SAVE THESE INSTRUCTIONS.
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Applications
1. TheRedHPGauge(3)isusedto
measurehigh-pressurecompressor
dischargesidepressure.
2. TheBlueLPGauge(5)isusedtomeasure
low-pressuresidesuctionorpressure.
3. TheManifoldValves(11)controltheflowof
refrigeranttoandfromtheYellowHose(18),
alsocalledtheChargeHose.
4. TheCouplerValves(22,23)control
theflowtotheGauges(3,5)fromthe
RedandBlueHoses(17,19).
5. TheSightGlass(13)allowschecking
theappearanceoftherefrigerant.
6. TheYellowHose(18),alsocalledCharge
Hosecanbeusedthreeways:
a. Refrigerantrecovery/evacuation.
b. Charging(filling)thesystem.
c. Forchecking,attachtheYellowHose(18)
tobothbranchesoftheT-fitting(16)
toreducetheriskofleaks.
7. Thechargevalveallowsforsimultaneous
connectionofarefrigerantrecoverysystem.
8. GeneralinstructionsforA/Cserviceareoutlined
inthismanual.Specificproceduresforeach
individualsystemtypeandmodelshould
bereferencedinthevehiclemanufacturer’s
specificA/Csystemservicemanual.
9. SeeOperationinstructionsthatfollow.
Components and Functions
Blue
Coupler
Storage
Plug (6)
Blue
Coupler
(23)
Red
Coupler
(22)
Red
Coupler
Storage
Plug (7)
Red HP
Gauge (3)
Blue LP
Gauge (5)
Red HP
Manifold
Valve
Blue LP
Manifold
Valve
Yellow
Charge Hose
Connector (16)
Red HP Hose
Connector
Blue LP Hose
Connector
Sight
Glass
(13)
Charge
Valve
LOW-PRESSURE
(LP) BLUE SIDE
HIGH-PRESSURE
(HP) RED SIDE
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Operation
Read the ENTIRE SAFETY WARNINGS section at the beginning of this manual
before set up or use of this product.
TO PREVENT EXPLOSION, SERIOUS INJURY, AND DEATH:
Service of air conditioning systems must be done only by trained and experienced technician to
avoid overfilling. Technicians opening refrigeration circuit in automotive air conditioning systems
MUST be certified in refrigerant recovery and recycling procedures in compliance with section
609 of Clean Air Act Amendments of 1990.
For additional information regarding ozone depletion and air conditioning service regulations,
visit EPA’s website: www.epa.gov/ozone
TO PREVENT SUDDEN LOSS OF CONSCIOUSNESS, AND DEATH:
Connect and use in a well-ventilated area ONLY. Refrigerant can displace air if allowed to
accumulate, causing sudden loss of consciousness followed by death.
This can happen WITHOUT FEELING SHORTNESS OF BREATH.
TO PREVENT EXPLOSION, SERIOUS INJURY, AND DEATH:
Do not open the red HP Manifold Valve unless requested to do so
during the recovery/evacuation procedure.
Refrigerant is under great pressure.
Attempting to add refrigerant through the HP side of the system may cause the refrigerant can to explode.
Note: Throughout this manual:
HP means High-pressure
LP means Low-pressure
CW means Clockwise
CCW means Counterclockwise
Note:Proceduressuchaschargingrefrigerantthrough
theHPsideofthesystemandaddinglubricantto
thesystemarebeyondthescopeofthismanual.
Note:Foradditionalinformationregardingthe
partslistedinthefollowingpages,refertothe
AssemblyDiagramneartheendofthismanual.
Manifold Valve (11) operation:
CW
= close
CCW
= open
Coupler Valve (22, 23) operation:
CCW
= close
CW
= open.
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WARNING
To prevent SERIOUS INJURY
and DEATH:
1.WearANSI-approvedsafetygoggles
andheavy-dutyworkgloves
duringsetupanduse.
2.DONOTOPENeither
ManifoldValveunlessdirectedto
doso;otherwise,refrigerantleaks,
A/Csystemcontamination,
andhazardousexpulsionof
pressurizedrefrigerantmayoccur.
3.Useinwell-ventilatedareaonly.
4.Keepgaugeandhosesaway
frommovingengineparts.
5.Turnoffvehicle’sengineand
A/Csystembeforeattachinggauge.
6.Thefollowingprocedureistobe
performedonlybyatechnician
certifiedinrefrigerantrecovery
andrecyclingprocedures,
asexplainedpreviously.
Diagnostic Check
1. Close both Manifold Valves (11) by turning CW.
Close both Coupler Valves (22, 23)
by turning CCW.
2. CONNECT HOSES:
a. ConnectoneendoftheBlueHose(19)
totheBlueLPHoseConnectorandthe
otherendtotheBlueCoupler(23).
b. ConnectoneendoftheRedHose(17)
totheRedLPHoseConnectorandthe
otherendtotheRedCoupler(22).
c. ConnectoneendoftheYellowHose(18)tothe
YellowChargeHoseConnector(16)andtheother
endtotheChargeValveonthatConnector.
3. ATTACH COUPLERS:
a. AttachtheBlueCoupler(23)tothe
suctionLPportontheA/Csystem.
b. AttachtheRedCoupler(22)tothe
dischargeHPportontheA/Csystem.
4. PERFORM CHECK:
a. Todoadynamiccheck:
Turnonthevehicleandallowitto
reachnormaloperatingtemperature.
Then,turnontheA/Csystem.
b. OpenbothCouplerValves(22,23)byturningCW.
c. Readthepressureonbothof
theGauges(3,5)andcompare
tothemanufacturer’s
recommendedreadings.
5. AFTER:
a. Close both Coupler Valves (22, 23)
by turning CCW.
b. TurnoffthevehicleandtheA/Csystem
ifdynamiccheckwasdone.
c. Carefully disconnect the Couplers (22, 23),
the hoses may contain residual refrigerant.
Pullbacktheknurledringoneach
Coupler(22,23)andstoreitonits
CouplerStoragePlug(7&6).
To discharge
HP port
To suction
LP port
To
charge
valve
CW CW
KEEP
CLOSED
KEEP
CLOSED
CWCW
Blue Yellow Red
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
WARNING
To prevent SERIOUS INJURY
and DEATH:
1.WearANSI-approvedsafetygoggles
andheavy-dutyworkgloves
duringsetupanduse.
2.DONOTOPENeither
ManifoldValveunlessdirectedto
doso;otherwise,refrigerantleaks,
A/Csystemcontamination,
andhazardousexpulsionof
pressurizedrefrigerantmayoccur.
3.Useinwell-ventilatedareaonly.
4.Keepgaugeandhosesaway
frommovingengineparts.
5.Turnoffvehicle’sengineand
A/Csystembeforeattachinggauge.
6.Thefollowingprocedureistobe
performedonlybyatechnician
certifiedinrefrigerantrecovery
andrecyclingprocedures,
asexplainedpreviously.
Recovery / Evacuation
1. Close both Manifold Valves (11) by turning CW.
Close both Coupler Valves (22, 23)
by turning CCW.
2. CONNECT HOSES:
a. ConnectoneendoftheBlueHose(19)
totheBlueLPHoseConnectorandthe
otherendtotheBlueCoupler(23).
b. ConnectoneendoftheRedHose(17)
totheRedLPHoseConnectorandthe
otherendtotheRedCoupler(22).
c. ConnectoneendoftheYellowHose(18)
totheYellowChargeHoseConnector(16)
andtheotherendtotherefrigerant
recoverysystem/vacuumpump.
3. ATTACH COUPLERS:
a. AttachtheBlueCoupler(23)tothe
suctionLPportontheA/Csystem.
b. AttachtheRedCoupler(22)tothe
dischargeHPportontheA/Csystem.
4. PERFORM RECOVERY / EVACUATION:
a. Turnontherefrigerantrecovery
system/vacuumpump.
b. OpenbothCouplerValves(22,23)byturningCW
andbothManifoldValves(11),turningthemCCW.
c. Readtheamountofvacuumon
theBlueLPGauge(5).
5. AFTER:
a. Shutofftherefrigerantrecoverysystem/
vacuumpumpwhenthevacuumlevelreaches
themanufacturer’srecommendedlevel.
b. Close both Coupler Valves (22, 23)
by turning CCW.
c. DisconnecttheCouplers(22,23)
fromtheA/Csystem.Pullbacktheknurled
ringoneachCoupler(22,23)andstoreit
onitsCouplerStoragePlug(7&6).
To
discharge
HP port
To refrigerant
recovery system
/ vacuum pump
To
suction
LP port
CCW CCW
CW CW
TURN VALVES AS SHOWN ONLY AFTER MAKING ALL
CONNECTIONS AND TURNING ON REFRIGERANT
RECOVERY SYSTEM / VACUUM PUMP
Blue Yellow Red
Page8 For technical questions, please call 1-800-444-3353. Item92649

WARNING
To prevent SERIOUS INJURY
and DEATH:
1.WearANSI-approvedsafetygoggles
andheavy-dutyworkgloves
duringsetupanduse.
2.DONOTOPENeither
ManifoldValveunlessdirectedto
doso;otherwise,refrigerantleaks,
A/Csystemcontamination,
andhazardousexpulsionof
pressurizedrefrigerantmayoccur.
3.Useinwell-ventilatedareaonly.
4.Keepgaugeandhosesaway
frommovingengineparts.
5.Turnoffvehicle’sengineand
A/Csystembeforeattachinggauge.
6.Thefollowingprocedureistobe
performedonlybyatechnician
certifiedinrefrigerantrecovery
andrecyclingprocedures,
asexplainedpreviously.
Charging
1. Close both Manifold Valves (11) by turning CW.
Close both Coupler Valves (22, 23)
by turning CCW.
2. CONNECT HOSES:
a. ConnectoneendoftheBlueHose(19)
totheBlueLPHoseConnectorandthe
otherendtotheBlueCoupler(23).
b. ConnectoneendoftheRedHose(17)
totheRedLPHoseConnectorandthe
otherendtotheRedCoupler(22).
c. ConnectoneendoftheYellowHose(18)
totheYellowChargeHoseConnector(16)
andtheotherendtorefrigerantsupply.
KEEP THE CAN/CYLINDER UPRIGHT.
3. ATTACH COUPLERS:
a. AttachtheBlueCoupler(23)tothe
suctionLPportontheA/Csystem.
b. AttachtheRedCoupler(22)tothe
dischargeHPportontheA/Csystem.
4. PERFORM CHARGING:
a. Turnonthevehicleandallowittocome
uptonormaloperatingtemperature.
Then,turnontheA/Csystem.
b. OpentheBlueCouplerValve(23)onlybyturning
CWandBlueManifoldValve(11),turningitCCW.
5. AFTER:
a. Afterchargingmanufacturerrecommended
amountofR-134a,
close both Coupler Valves (22, 23)
by turning CCW.
b. TurnoffthevehicleandtheA/Csystem.
c. Carefully disconnect the Couplers (22, 23)
from the A/C system, the hoses may contain
residual refrigerant.Pullbacktheknurled
ringoneachCoupler(22,23)and
storeitonitsCouplerStoragePlug(7&6).
To
discharge
HP port
To R-134a
refrigerant
supply
To
suction
LP port
CCW CW
CW CW
TURN VALVES AS SHOWN ONLY AFTER
MAKING ALL CONNECTIONS
Blue Yellow Red
KEEP
CLOSED
Page9For technical questions, please call 1-800-444-3353.Item92649

Inspection, Maintenance and Cleaning
Procedures not specifically explained in this manual must
be performed only by a qualified technician.
TO PREVENT SERIOUS INJURY FROM TOOL FAILURE:
Do not use damaged equipment. If abnormal noise, vibration, or
leaking air/refrigerant occurs, have the problem corrected before further use.
1. Before each use,inspectthegeneralcondition
oftheA/CManifoldSet.Checkforcrackedor
brokenparts,damagedHoses(17,18,19),andany
otherconditionthatmayaffectsafeoperation.Ifa
problemwiththeSetoccurs,haveitcorrectedbefore
furtheruse.Do not use damaged equipment.
2. Periodically,cleanwithadampcloth
usingamilddetergentorsolvent.
3. Whenstoring,keepthesetcleananddry.
Also,connecttheRedCoupler(22)and
theBlueCoupler(23)toitscorresponding
CouplerStoragePlug(7or6)to
preventcontamination.
Page10 For technical questions, please call 1-800-444-3353. Item92649

Parts List and Diagram
Part Description Qty.
1 RubberCover 1
2 ManifoldBody 1
3 RedHPGauge 1
4 Hook 1
5 BlueLPGauge 1
6 BlueCouplerStoragePlug 1
7 RedCouplerStoragePlug 1
8 ValveSeat 2
9 ValveStem 2
10 ValveNut 2
11 ManifoldValve 2
12 O-Ring 1
Part Description Qty.
13 SightGlass 1
14 RingNut 1
15 Connector 2
16 TConnector 1
17 RedHose(HPRefrigerant) 1
18 YellowHose(HPRefrigerant) 1
19 BlueHose(LPRefrigerant) 1
20 Connector 2
21 O-Ring 2
22 RedCoupler(HP) 1
23 BlueCoupler(LP) 1
HP means High-pressure LP means Low-pressure
Page11For technical questions, please call 1-800-444-3353.Item92649

PLEASE READ THE FOLLOWING CAREFULLY
THEMANUFACTURERAND/ORDISTRIBUTORHASPROVIDEDTHEPARTSLISTANDASSEMBLYDIAGRAM
INTHISDOCUMENTASAREFERENCETOOLONLY.NEITHERTHEMANUFACTURERORDISTRIBUTOR
MAKESANYREPRESENTATIONORWARRANTYOFANYKINDTOTHEBUYERTHATHEORSHEIS
QUALIFIEDTOMAKEANYREPAIRSTOTHEPRODUCT,ORTHATHEORSHEISQUALIFIEDTOREPLACE
ANYPARTSOFTHEPRODUCT.INFACT,THEMANUFACTURERAND/ORDISTRIBUTOREXPRESSLY
STATESTHATALLREPAIRSANDPARTSREPLACEMENTSSHOULDBEUNDERTAKENBYCERTIFIEDAND
LICENSEDTECHNICIANS,ANDNOTBYTHEBUYER.THEBUYERASSUMESALLRISKANDLIABILITY
ARISINGOUTOFHISORHERREPAIRSTOTHEORIGINALPRODUCTORREPLACEMENTPARTS
THERETO,ORARISINGOUTOFHISORHERINSTALLATIONOFREPLACEMENTPARTSTHERETO.
Record Serial Number Here:
Note:Ifproducthasnoserialnumber,recordmonthandyearofpurchaseinstead.
Note:Somepartsarelistedandshownforillustrationpurposesonly,and
arenotavailableindividuallyasreplacementparts.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
Limited 90 Day Warranty
HarborFreightToolsCo.makeseveryefforttoassurethatitsproductsmeethighqualityanddurabilitystandards,
andwarrantstotheoriginalpurchaserthatthisproductisfreefromdefectsinmaterialsandworkmanshipforthe
periodof90daysfromthedateofpurchase.Thiswarrantydoesnotapplytodamageduedirectlyorindirectly,
tomisuse,abuse,negligenceoraccidents,repairsoralterationsoutsideourfacilities,criminalactivity,improper
installation,normalwearandtear,ortolackofmaintenance.Weshallinnoeventbeliablefordeath,injuries
topersonsorproperty,orforincidental,contingent,specialorconsequentialdamagesarisingfromtheuseof
ourproduct.Somestatesdonotallowtheexclusionorlimitationofincidentalorconsequentialdamages,sothe
abovelimitationofexclusionmaynotapplytoyou.THISWARRANTYISEXPRESSLYINLIEUOFALLOTHER
WARRANTIES,EXPRESSORIMPLIED,INCLUDINGTHEWARRANTIESOFMERCHANTABILITYANDFITNESS.
Totakeadvantageofthiswarranty,theproductorpartmustbereturnedtouswithtransportationcharges
prepaid.Proofofpurchasedateandanexplanationofthecomplaintmustaccompanythemerchandise.
Ifourinspectionverifiesthedefect,wewilleitherrepairorreplacetheproductatourelectionorwemay
electtorefundthepurchasepriceifwecannotreadilyandquicklyprovideyouwithareplacement.Wewill
returnrepairedproductsatourexpense,butifwedeterminethereisnodefect,orthatthedefectresulted
fromcausesnotwithinthescopeofourwarranty,thenyoumustbearthecostofreturningtheproduct.
Thiswarrantygivesyouspecificlegalrightsandyoumayalsohaveotherrightswhichvaryfromstatetostate.
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Harbor Freight Tools R134A User manual

R134A
Harbor Freight Tools
Brand
Harbor Freight Tools
Model
R134A
Category
Power drills
Type
User manual

Harbor Freight Tools R134A is a professional-grade manifold gauge set designed for automotive air conditioning service and diagnostics. It features high and low-pressure gauges with +/- 2% accuracy, allowing you to monitor and adjust refrigerant pressures precisely. The color-coded hoses (blue for low-pressure and red for high-pressure) and quick-disconnect valves ensure easy and secure connections. The sight glass enables you to check the refrigerant's condition, while the included storage plugs protect the gauge's fittings.

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