Harbor Freight Tools R134A User manual

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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Specifications

Blue(Low)Gauge 0-120PSI

BlueHose

IN.FFLx4FT.9IN.

Red(High)Gauge 0-500PSI

RedHose

IN.FFLx4FT.9IN.

YellowHose

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:

= close

CCW

= open

Coupler Valve (22, 23) operation:

CCW

= close

= 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

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).

discharge

HP port

To refrigerant

recovery system

/ vacuum pump

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).

discharge

HP port

To R-134a

refrigerant

supply

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anddry.

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LISTANDASSEMBLYDIAGRAM

INTHISDOCUMENTAS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.

Harbor Freight Tools R134A User manual

Brand: Harbor Freight Tools

Model: R134A

Category: Power drills

Type: User manual

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Harbor Freight Tools R134A User manual

Harbor Freight Tools R134A User manual

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