Operating Manual For Model 34788
OperatingManualOperating Manual forModel 34788Recovery, Recycling, Recharging Unit
Model 34788Recovery, Recycling, & Recharging UnitSAFETY DEFINITIONS: Follow all WARNING, CAUTION, and NOTE messages in this manual. These messages are defined asfollows: WARNING means you may risk serious personal injury or death; CAUTION means you may risk personal injury, propertydamage, or unit damage; and NOTEs and OPERATING TIPS provide clarity and helpful information. These safety messages coversituations ROBINAIR is aware of. ROBINAIR cannot know, evaluate, and advise you as to all possible hazards. You must verify thatconditions and procedures do not jeopardize your personal safety.DISCLAIMER: Information, illustrations, and specifications contained in this manual are based on the latest information availableat the time of publication. The right is reserved to make changes at any time without obligation to notify any person or organizationof such revisions or changes. Further, ROBINAIR shall not be liable for errors contained herein or for incidental or consequentialdamages (including lost profits) in connection with the furnishing, performance, or use of this material. If necessary, obtain additionalhealth and safety information from the appropriate government agencies and the vehicle, refrigerant, and lubricant manufacturers.WARNINGSALLOW ONLY QUALIFIED PERSONNEL TO OPERATE THE UNIT. Before operating the unit, read and followthe instructions and warnings in this manual. The operator must be familiar with air conditioning and refrigerationsystems, refrigerants, and the dangers of pressurized components. If the operator cannot read this manual,operating instructions and safety precautions must be read and discussed in the operator’s native language.PRESSURIZED TANK CONTAINS LIQUID REFRIGERANT. Do not overfill the internal storage vessel, becauseoverfilling may cause explosion and personal injury or death. Do not recover refrigerants into nonrefillablecontainers; use only federally authorized refillable containers (DOT spec. 4BW or 4BA).HOSES MAY CONTAIN LIQUID REFRIGERANT UNDER PRESSURE. Contact with refrigerant may causepersonal injury. Wear protective equipment, including safety goggles. Disconnect hoses using extreme caution.AVOID BREATHING A/C REFRIGERANT AND LUBRICANT VAPOR OR MIST. Exposure may irritateeyes, nose, and throat. To remove refrigerant from the A/C system, use only equipment certified for the typeof refrigerant being removed. Use the unit in locations with mechanical ventilation that provides at leastfour air changes per hour. If accidental system discharge occurs, ventilate the work area before resumingservice.DO NOT USE AN EXTENSION CORD. An extension cord may overheat and cause fire. If you must use anextension cord, use the shortest possible cord with a minimum size of 14 AWG.TO REDUCE THE RISK OF FIRE, do not use the unit in the vicinity of spilled or open containers of gasolineor other flammable substances.CAUTION—DO NOT PRESSURE TEST OR LEAK TEST EQUIPMENT AND / OR VEHICLE AIR CONDITIONING SYSTEMS WITH COMPRESSED AIR. Some mixtures of air and refrigerant have been shown tobe combustible at elevated pressures. These mixtures, if ignited, may cause injury or property damage.TO PREVENT CROSS-CONTAMINATION, USE THIS UNIT WITH R-134a REFRIGERANT ONLY. The unit isdesigned to recover, recycle, and recharge only R-134a refrigerant. Do not attempt to adapt the unit for anotherrefrigerant. Do not mix refrigerant types through a system or in the same container; mixing of refrigerants willcause severe damage to the unit and the vehicle air conditioning system.HIGH VOLTAGE ELECTRICITY INSIDE THE UNIT HAS A RISK OF ELECTRICAL SHOCK. Exposure maycause personal injury. Disconnect the power before servicing the unit.Additional health and safety information may be obtained from the refrigerant andlubricant manufacturers.OPERATING NOTE: At temperatures exceeding 120 F / 49 C, wait 10 minutes between recovery jobs.
Table of ContentsIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Menu Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Unpack the Accessory Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Power Up the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Select a Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Select Operating Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Set Tank Fill Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Add Oil to the Vacuum Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Fill the Internal Storage Vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Recover Refrigerant from a Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Evacuate the A/C System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Flushing the Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Replenish A/C System Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Recharge the A/C System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Operating Instructions — Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Electrical Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Manually Fill the Internal Storage Vessel (ISV) . . . . . . . . . . . . . . . . . . . 15Tank Fill Hose Filter Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Replace the Filter-Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Check Remaining Filter Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Change the Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Scale Calibration Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Change Vacuum Pump Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Adjust Tank Fill Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Check for Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Spanish Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21French Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inside Front CoverWarranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inside Back CoverIMPORTANT: To comply with federal law governing A/C system service, complete and mail theMVAC Certification Form included in the accessory kit. Technicians using this equipment must becertified under EPA Section 609 (Environmental Protection Agency). For more information, readthe MACS information included in the accessory kit, or visit the MACS website at www.macsw.org.To validate the warranty provided by Robinair, complete the warranty card included in the accessorykit, and mail it within ten days from the purchase date of the unit.539602Rev. H June 11, 20131
IntroductionRobinair No. 34788 is used on R-134a vehicles and is designed to be compatible with existing serviceequipment and standard service procedures. Model No. 34788 is a UL-listed, single-pass systemthat meets SAE specifications for recycled refrigerant. Follow the SAE-J2211 recommended serviceprocedure for the containment of R-134a.The unit includes a 1.5 cfm (42 l/m) Robinair high vacuum pump for fast, thorough evacuation. Thecompressor pulls the A/C system to 0 psig, then works in series with the vacuum pump to achieve highlyefficient recovery and immediate recharge. If the system is not opened for service, there is no needto pull additional vacuum. If the system is opened for service, use the unit’s vacuum cycle to removeair and moisture from the A/C system. (We recommend a minimum 15-minute vacuum, or follow thevehicle manufacturer’s specs.) Note: R-134a systems require special oils. Refer to the A/C systemmanufacturer’s service manual for oil specifications.Control Panel:folds flat for storage.Flow Indicators: red light indicateshigh-side flow from vehicle A/C systemthrough unit; blue light indicates lowside flow from vehicle A/C systemthrough unit.Database Expansion Slot: anoptional vehicle database willsupply information regardingcharge capacity by vehicle model.Manifold Gauges:connect to vehicle A/Csystem; show system’slow-side and high-sidepressure.Digital Display: visualinterface between operatorand machine.Tool Storage Areas(additional storageon back side forextra filter-driers andoil bottles).Main Power Switch: supplieselectrical power to unit.Technical SpecificationsNominal Voltage . . . . . . . 34788:115V, 60 Hz34788-I: 230V, 50/60 HzOperating Range . . . 50 to 120 F (11 to 49 C)Utilization Voltage Range . . . 34788:34788-I:Pump Free-Air Displacement . . 1.5 cfm (42 l/m)2104–127200–250Filter-Drier . . . . . . . . . . . . 43 cu. in. spin-on typeDimensions . . . . . . . . . . . 49" H x 34" W x 23" D(124.5 cm x 86.4 cm x 58.4 cm)
Keypad FunctionsSTARTYESSTART / YES begins or resumes a function, or answers a query.STOPNOSTOP / NO terminates or pauses a function, or answers a query.When the unit is not performing afunction, pressing the UP or DOWNarrow key adjusts contrast on thedigital display.MENU displays the selection menu.MENUARROWS are used for scrollingthrough menu items.AUTOMATIC activates a menu that helpsthe user set up an automatic recover /vacuum / leak test / charge sequence.AUTOMATICKeypadRECOVER activates the recovery sequence.RECOVERVACUUM activates the vacuumsequence, followed by an option toactivate a leak test.VACUUMINJECT OILINJECT OIL injects oil into the vehicleA/C system.CHARGECHARGE charges the vehicle A/Csystem with a programmed amount ofrefrigerant.REFRIGERANTDATABASEREFRIGERANT DATABASE (optional)offers access to system oil and refrigerantspecifications by vehicle model and year.Purchase Robinair part no. 34411.GlossaryA/C System : The vehicle air conditioning system being serviced.Internal Storage Vessel : The refillable refrigerant storage vesseldesigned specifically for this unit; 30 lb. (14 kg).Source Tank : A disposable tank of new refrigerant used to refill theinternal storage vessel; not included.Unit : Model No. 34788.539602Rev. H June 11, 20133
IntroductionMenu Functions1. Press the MENU button on the keypad.2. Press the UP or DOWN arrow key to scrollthrough the menu choices shown on thesecond line of the display :SELECT LANGUAGEVERSION X.XXSELECT UNITSMAINTAIN VACUUM OILMAINTAIN FILTERREFRIG. MANAGEMENTMANUAL REFILLADJUST TANK FILL LVLCALIBRATION CHECKSELECT BEEPER TONESERVICE MENUHOSE FLUSHDISPLAY TANK INFO3. Press START / YES to make a choice from themenu. Press STOP / NO to pause during anyprocess, and STOP / NO a second time to exita process.Start / YesButtonStop / NoButtonArrowKeysMenuButtonThis menu item displays how long the vacuum pumphas operated since the last oil change, and allows theuser to reset the value once an oil change is complete.Refer to the instructions outlined in the Maintenancesection under Change Vacuum Pump Oil.Maintain FilterThe filter-drier removes acid, particulates, and moisturefrom the refrigerant. To meet SAE J-2788 requirements,it is mandatory to replace the filter-drier after 150 lbs.(68 kg) of refrigerant has been filtered. This menuitem shows how much refrigerant has been filteredsince the last filter change, and allows the user toreset the value once a filter change is complete. Acode, which appears on the filter, must be enteredinto the unit to ensure compliance with SAE J-2788.Refer to the instructions outlined in the Maintenancesection under Replace the Filter-Drier.Refrig. ManagementDisplays the amount of refrigerant recovered,charged, and replenished (for the life of the unit),and filtered (since the last filter change).Manual RefillUse to transfer refrigerant from the source tank to theinternal storage vessel (ISV). Refer to instructionsoutlined in the Maintenance section under ManuallyFill the ISV.Adjust Tank Fill LvlWhen connected to a refrigerant source, the unitmaintains a pre-set amount of refrigerant in the internalstorage vessel (default is 15 lbs.). This value may beadjusted up or down to suit the user’s needs. Referto instructions outlined in the Maintenance sectionunder Adjust Tank Fill Level.Calibration CheckUse to verify internal scale calibration. Refer toinstructions in Maintenance section under ScaleCalibration Check.Select LanguageOperator may choose to have prompts displayed inone of three languages: English, Spanish, or French.Select Beeper ToneSet the beeper tone to high (Beeper 1), low (Beeper2) or none (Mute).Version X.XXDisplays the revision level of the software in the unit.Service MenuRobinair service center use only.Select UnitsThe operator may choose to have test resultsdisplayed in Imperial (lb.), Imperial (lb. and oz.), orMetric (kg).Hose FlushFlushes any residual oil from the unit for service ofvehicles with different oils.Maintain Vacuum OilFor maximum vacuum pump performance, changevacuum pump oil after every 10 hours of operation.4Display Tank InfoDisplays internal storage vessel (ISV) pressure andtemperature. Use to check the ISV for excessivepressure.
SetupUnpack the Accessory KitUnpack the accessory kit from the bag, and remove theplastic packaging. The kit consists of A calibration weight. Vacuum pump oil, oil filler cap, and tube.CAUTION: R-134a systems have specialfittings (per SAE specifications) to avoidcross-contamination with R-12 systems.DO NOT adapt your unit for a differentrefrigerant — system failure will result. Plastic pouch containing a warranty card (to becompleted and mailed), applicable MSDS sheets, aservice center listing, and an envelope of Mobile AirConditioning Society (MACS) information.Important: You must complete and mail the MVACCertification Form and your technicians must becertified with the Environmental Protection Agency(EPA) to operate this equipment.MainPower SwitchPower Up the Unit1. Unwind the power cord from the handle, and plug itinto a correct voltage outlet. See Figure 1.PowerCord2. Turn on the main power switch. The first time the unitis powered up, it displays the initial setup mode.Select a Language – EnglishSeleccionar Idioma – EspanolSelection Langue – FrancaisThe operator may choose to have prompts displayed inone of three languages: English, Spanish, or French.1. Use the UP or DOWN arrow key to toggle throughthe choices for English, Spanish, or French. Refer toFigure 2.2. Press START / YES to select the displayed language.Figure 1Select Operating UnitsThe operator may choose to have test results displayedin Imperial (lb., or lb. and oz.) or Metric (kg) units.1. Use the UP or DOWN arrow key to toggle throughchoices for IMPERIAL UNITS or METRIC UNITS.2. Press START / YES to select the displayed operatingunit choice.Start / YesButtonStop / NoButtonArrowKeysFigure 2539602Rev. H June 11, 20135
SetupSet Tank Fill LevelThe operator may either accept the unit’s pre-setdefault weight of 15 lbs. (6.8 kg) of refrigerant stored inthe internal storage vessel (ISV), or change the amountto accommodate the application.Vacuum PumpFill PortThe unit displaysSightGlassLEVEL: 15.00 LBS.ENTER TANK FILL LVLLIMIT: 4 TO 17 LBS.PRESS START / YES TO SAVE1. Press START / YES to accept the default amount, oruse the keypad to enter a desired amount and pressSTART / YES.Add Oil to the Vacuum PumpCAUTION: The vacuum pump is shipped withoutoil in the reservoir. Failure to add oil to the vacuumpump will damage the pump.Fill PortThe unit displaysADD 5 OZ OF NEW OILTO VACUUM PUMPSTART TO CONTINUE1. Remove the brass plug from the vacuum pump oil fillport. See Figure 3.2. Attach the flexible tube/cap to the oil bottle; pour onlyfive (5) ounces of vacuum pump oil into the fill port.Note: You will top off the oil in the next step as thevacuum pump is running.3. Press and release the START / YES key. While thevacuum pump is running, slowly add oil until thelevel rises to the center of the reservoir’s sight glass.4. Press the STOP / NO key to stop the vacuum pump,and install the brass plug in the fill port.5. Press START / YES to continue.6Sight GlassFigure 3CAUTION: The unit is programmedto run the setup procedure as outlinedhere. To prevent personal injury, doNOT operate the unit at any other timewithout the brass plug installed, becausethe vacuum pump is pressurized duringnormal operation.
SetupFill the Internal Storage Vessel (ISV)1. Press START / YES, and the unit automaticallyruns a 5-minute vacuum to clear all internal air.Note: The “burping” noise heard during thisprocess indicates air is being purged from thesystem—this is normal.2. After the vacuum pump shuts off, connectthe fill hose to the liquid connector on a fullsource tank.Low- andHigh-SideHoses3. Open the source tank valve.4. Install the source tank, and secure it to theunit (using the tank strap) in such a waythat liquid refrigerant is supplied to theconnection.PowerCord5. Press START / YES to begin filling theinternal storage vessel. Add at least 8 lbs.(3.6 kg) of refrigerant to ensure enoughrefrigerant is available for charging.Fill Hose(connect toliquid line)SourceTankStrapThis process takes 15–20 minutes. The unitstops when a sufficient amount of refrigeranthas been transferred to the internal tank, orwhen the source tank is empty.Press STOP / NO to pause. Press STOP /NO again to exit, or START / YES to resume.6. When the fill process is complete, pressSTOP / NO to exit. The unit is ready foroperation.Note: There is no need to calibrate the scale; itis calibrated at the factory.539602Rev. H June 11, 2013Figure 4Side View7
Operating InstructionsRecover Refrigerant from a Vehicle1. Empty the oil drain bottle located on the right-handside of the unit, if necessary, or make note of thecurrent oil level. See Figure 5.2. Connect the high- and low-side hoses to the vehicleA/C system.3. Open the coupler valves on the hoses.4. Press the RECOVER button.Oil DrainBottleNote: The clicking noise heard during the recoveryprocess indicates the solenoid is opening and closing— this is normal.5. When the system has recovered to 0 psi, thevacuum pump starts and runs until recovery iscomplete. The unit then goes into an automatic oildrain—this may require 90 seconds to complete.Figure 56. After the oil drain is complete, the display showsRECOVER COMPLETERECOVERED XX.XX LBS. (X.XX KG)CHECK OIL BOTTLENote: The displayed recovered weight can vary,depending on ambient conditions, and should not beused as an indicator of scale accuracy.7. Check the oil drain bot
Service Menu Robinair service center use only. Hose Flush Flushes any residual oil from the unit for service of vehicles with different oils. Display Tank Info Displays internal storage vessel (ISV) pressure and temperature. Use to check the ISV for excessive pressure. Stop / No Button Arrow Keys Start / Yes Button Menu Button. 539602 Rev. H June 11, 2013 5 Setup Unpack the Accessory Kit .
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Robinair No. 34788 is used on R-134a vehicles and is designed to be compatible with existing service . low-side and high-side pressure. Flow Indicators: red light indicates high-side flow from vehicleA/C system . user to reset the value once an oil change is complete.
Robinair No. 34788 is used on R-134a vehicles and is designed to be compatible with existing service . low-side and high-side pressure. Flow Indicators: red light indicates high-side flow from vehicle A/C system . reset the value once an oil change is complete. Refer to
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ROB17499 751574 Robinair AC1234-6, 34788NI, 34788NI-H 99.99 Part Number SKU Brand Fits Price ROB34411-H EPO Robinair 34788, 34788-H, & 34988 249.99 ROB34412-C EPO Robinair 34288NI, 34788NI, 34788NI-H & 34988NI 249.99 ROB34413-A EPO Robinair 2013-2018 for R1234yf Machines 249.99 Filters/
