Dual II
Contents
1. Installation and Operation 4 In the unlikely event the LCD screen is unreadable 10 11 12 13 14 15 17 18 19 20 21 22 upon power up adjust LCD contrast Refer to Adjusting LCD Contrast in this section Turn the vacuum recycle valve to VACUUM Push the compressor button to turn ON The COMPRESSOR ON indicator flashes while a background check is performed and then the compressor activates The low side manifold gauge shows vacuum increasing Monitor the low side manifold gauge until a minimum of 25 inches of mercury is reached Close the following Blue liquid tank hand valve and Blue service hose hand valve or coupler CCW Turn the vacuum recycle valve OFF Push the compressor button to turn OFF The COMPRESSOR ON indicator goes out and the compressor stops running Remove the blue service hose from the tank Remove the tank adapter 1 15080 if used Identify the yellow hose leading from the bottom of the unit Connect the hose end to the tank purge port Rotate the tank so the valves face towards the front of the unit Identify the red hose leading from the bottom of the unit Connect the hose end with the anti blowback valve to the red vapor tank port Open the red vapor recovery tank valve Identify the blue hose leading from the bottom of the unit Connect the hose end with the anti blowback valve to the blue liquid tank port Open the bl2. Refrigerant Gases Halogens are any of the five elements fluorine chlorine bromine iodine and astatine that form part of group 7a of the Periodic Table of Elements The fluorine and chlorine elements of this family are used to create a methane organic compound used to form dichlorodifluoromethane CCL F a halogenated hydrocarbon called CFC 12 chlorofluorocarbon 12 This refrigerant gas is commonly known as Refrigerant 12 or R 12 and has been used as a refrigerant in mobile air conditioning systems for many years The new refrigerant in the halogenated hydrocarbon family HFC 134a CH FCF or R 134a is now being incorporated in mobile air conditioning systems HFC stands for hydrofluorocarbon The environmental impact of mobile air conditioning refrigerant containing chlorine R 12 has caused regulatory action that will eventually eliminate the use of such products Regulatory action is necessary because when the chlorine content in R 12 is exposed to the atmosphere e It depletes the protective ozone layer in the atmosphere e It has relatively high global warming potential and e lts long atmospheric lifetime is approximately 120 years R 134a has been developed for new vehicle production but does not replace or directly substitute for R 12 in existing vehicles R 134a does not contain chlorine does not deplete the ozone layer in the atmosphere and has an atmospheric lifetime of about 15 5 years Environmenta
3. v There will be no Oil Drain prompt if 8 oz of refrigerant is not recovered Service hose evacuation is complete Installation and Operation Adding Refrigerant to DUAL II Follow this procedure to add virgin refrigerant to your DUAL II unit 4 The recovery tank should have at least six pounds of refrigerant or the charge procedure may not be completed 1 Refer to Preparing and Installing Recovery Tank in this chapter 2 Open the blue liquid and red vapor recovery tank valves 3 Connect the blue service hose from the manifold gauge assembly to the tank of virgin refrigerant For R 134a install the supplied tank adapter between the tank valve and the blue hose The virgin tank should be upright valve up 4 Open the following Virgin tank valve Yellow service hose hand valve Blue service hose hand valve or coupler and Low side manifold hand valve 5 Turn the vacuum recycle valve to RECYCLE 6 Push the compressor button to turn ON The COMPRESSOR ON indicator flashes while a background check is performed and then the compressor activates Refrigerant flows from the virgin tank through your DUAL II unit and into the prepared recovery tank 4 Monitor the weight on the LCD display until the desired amount of virgin refrigerant has been transferred Refer to Tank Full Empty in this Chapter 7 When the desired amount of refrigerant has been transferred into the recovery ta
4. viii Introduction Use your Dual Il unit on automotive air conditioning systems to e Recover Remove refrigerant from vehicle e Recycle Filter dry and store recovered refrigerant in a refillable tank e Evacuate Remove air and moisture from air conditioning system using a vacuum pump to draw the system into a deep vacuum and e Recharge Refill the air conditioning system with a specified amount of refrigerant Your DUAL IlI unit is a single pass design This means recovered refrigerant is filtered and dried before entering the recovery tank Refrigerant in the tank is always ready for use See Chapter 2 Recovering Refrigerant From Vehicle There is no need to perform a separate recycle function Recover evacuate and recharge functions are performed semi automatically This manual applies to the following DUAL II model Model Number Refrigerant Type Voltage EEAC313A R 12 R 134a 120 VAC Most references in text to DUAL II apply to both refrigerants When a difference exists the difference is specified Your DUAL II unit includes e A Liquid Crystal Display LCD e Two standard gauge sets with service hoses fittings and adapters e Two 30 pound capacity recovery tanks and electronic scales e Two master filters and e Two oil cups 4 The recovery tanks are temperature monitored to maintain accurate purging of non condensable gases under all conditions 1 1 Introduction
5. vd Safety messages are provided to help prevent personal injury and eguipment damage All safety messages are introduced by a signal word indicating the hazard level The types of safety messages are Indicates an imminently hazardous situation which if not avoided will result in death or serious injury to the operator or to bystanders Indicates a potentially hazardous situation which if not avoided could result in death or serious injury to the operator or to bystanders Indicates a potentially hazardous situation which if not avoided may result in moderate or minor injury to the operator or to bystanders Some safety messages also contain visual symbols with signal words Example Engine systems can malfunction expelling fuel oil vapors hot steam hot toxic exhaust gases acid refrigerant and other debris Wear safety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses Engine systems that malfunction can cause injury vi Using this Manual Terms Use the following definitions as a foundation to help understand your DUAL Il unit s processes and or components Virgin Tank A refrigerant tank disposable or refillable that contains new refrigerant When empty a disposable virgin tank must be evacuated and cannot be refilled Dispose of this evacuated tank in accordance with local state and federal regulations that ap
6. 4 Press Y YES button to access Master Filter change 5 Press Y YES button to reset filter meter to 95 Ibs The oil in the pump assembly must be changed quarterly to prolong pump life The optional oil change kit is recommended For additional information refer to Replacement Parts in this chapter All of the parts necessary to change the pump oil are included in this kit 3 3 Maintenance Maintaining the Pump 1 Evacuate service hoses by recovering if necessary and pulling a vacuum For additional information refer to Chapter 2 Evacuating Service Hoses Insure both control valves on the control panel are off Unplug your DUAL II unit from the electrical outlet Remove both master filters Refer to Changing the Master Filter in this chapter Remove both recovery tanks Remove the screws holding the cord wrap Remove the cord wrap Remove the screws holding the back panel Remove the back panel Figure 3 2 Pumps 3 4 Maintenance vd 10 e Wear safety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses e Read understand and follow Safety Information in the front of this manual Disconnect the tubing and hose assembly from one pump at a time Taking note of their locations 4 Fittings at the pump will be under pressure 4 Discard the O rings from the hose tube ends 11 12 13
7. Gently set the recovery tank on the appropriate scale with the hand valves up facing the front of the unit 3 Place an elastic strap around each recovery tank so that the bottom of the strap is 3 5 above the tank center weld 4 Slide the temperature probe extending from the cabinet between the tank and the strap 2 3 Installation and Operation Temperature Probe Figure 2 2 Recovery Tank and Temperature Probe 4 Use only the 30 pound capacity recovery tank supplied with your DUAL II unit or one indicated by the warning label on the back of the unit Using any other type or capacity tank could create the danger of explosion and potential for personal injury Inaccurate refrigerant amount may display if the correct tank is not used 5 Connect blue service hose from the manifold gauge assembly to the blue liquid tank port 4 For R 134a install the supplied tank adapter part number 1 15080 between the tank valve and the blue hose 6 Open the blue liquid recovery tank valve 7 Open the following Yellow service hose hand valve Blue service hose hand valve or coupler CW and Low side manifold hand valve 8 Turn both vacuum recycle valves OFF and have both charge valves OFF 9 Connect the power cord to the proper wall outlet with the correct voltage for the unit For additional information refer to Power Up in this section and Chapter 1 Specifications The LCD display initiates
8. Information in the front of this manual 1 Evacuate service hoses by recovering if necessary then Turn the vacuum recycle valve OFF Push the compressor button to turn compressor OFF Turn vacuum recycle valve to VACUUM Push the compressor button to turn compressor ON Turn vacuum recycle valve to Off when 20 in hg is achieved Push compressor button to turn compressor OFF 2 Remove the power cord from the wall outlet 3 Unscrew the two hose fittings from the master filter 3 2 Maintenance RISK OF SUFFOCATION VEHICLE EXHAUST GASES CONTAIN CARBON MONOXIDE RANT GAS CAN DISPLACE AIR IN A DN CORDS ARE NOT No IKTENSION CORD 1S THIS EQUIPMENT SHOULD BE USED IN LOCATIONS WITH VENTILATION THAT PRO AT LEAST FOUR AIR CHANGES PER HOUR SUFFOCATION WILL CAUSE INJURY ars Figure 3 1 Master Filter 4 Remove the master filter from its bracket 4 Dispose of the filter according to local state and federal regulations that apply in your area 5 Lightly oil hose seals and install a new master filter matching the direction of FLOW on the filter with the flow decal on the cabinet 6 Attach the fittings hand tight 7 Reset master filter meter Resetting Master Filter Meter Pump Use the procedure in this section to reset the master filter meter 1 Power up the Dual II 2 Press Y YES button to access Set up menu 3 Press ff UP button to scroll to appropriate Master Filter Replace
9. These tanks are D O T certified for refilling D O T certified tanks are marked D O T 4BA 350 or D O T 4BA 400 Explosion can cause injury Removing tubing assemblies may discharge refrigerant e Wear safety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses Expelled refrigerant may cause injury A test vehicle may move if not properly prepared e Block the drive wheels before performing a test with the engine running Unless instructed otherwise set the parking brake and put the gear selector in neutral manual transmission or park automatic transmission If the vehicle has an automatic parking brake release disconnect the release mechanism for testing and reconnect it when testing is completed e Do not leave a running engine unattended A moving vehicle can cause injury Risk of injury e This equipment should be operated by qualified personnel only e Use this equipment only as described in this manual Use only the manufacturer s recommended attachments e Do not operate equipment with a damaged cord or if the equipment has been dropped or damaged until it has been examined by a qualified service representative Care should be taken to arrange the power cord so that it will not be tripped over or pulled e Always unplug equipment from electrical outlet when not in use Never use the cord to pull the plug from the outlet G
10. Vacuum Off or Recycle Two Charge Valves Used to select Charge Two Compressor Power Switches Turns recovery compressors on and off Two Compressor On Indicators Lights green when compressor is running Two High Pressure Indicators Flashes red when pressure in excess of 450 psi is seen in the Dual system or will be a steady red if recovery tank pressure reaches 350 psi Pressure above 450 psi typically means the red hand valve on the tank is closed the control valve on the panel is off or the red hose fitting on the recovery tank is not installed or tight Tank pressure above 350 psi indicating excessive air in the tank is normally due to a leak in the system being recovered Two Tank Full Indicators Lights when the recovered refrigerant amount reaches maximum safe limit LCD Display Unit On Indicator Lights when power cord is connected to A C power Shows charged recovered amounts or chargeable weight of the recovery tank Also Indicates software version Tank Full and Tank Empty conditions Two Master Filters on rear of unit Consists of a 10 micron particulate filter and desiccant to remove moisture For additional information refer to Chapter 3 Changing the Master Filter C Two Scales Electronically measures the amount of refrigerant dispensed recycled and remaining in the recovery tank Two Oil Separators internal Removes oil and other contaminants from the refrigerant being recycled
11. ee ke ee ee ee 2 13 Evacuating the A C System II 2 14 Charging the A C System iese ee ed eek ed ee ed ee AR ee ee ee ed ee ke ed ee ke ee ee ee ee 2 15 Displaying the Refrigerant AMOUNT esse ee ee ee ee S 2 16 all ds su EE OE tava N Ea A dgeas ita tes 2 16 Removing the Recovery Tank siese ees ee ee ee ee ee ee ee ee ee ee ee RE ee ee ee ee 2 16 Evacuating the Service HoseS iese dee ee see dee ee ee ee ee ee ee eed ee ee ee ee ee eke ee ed ee ke eed ee 2 17 Adding Refrigerant to your DUAL H ooo ees ee ee ee see ee ee ee ee ee dee ee ee ee ee ee ee ee ee ee ee ee 2 18 Error EETL RE EE bubueueuayeeenaebaedede eine ERE 2 19 Maintenance sac iat ie whe rc kel te eee Ee ee 3 1 EQUIPMENT TIPS SE 3 1 Master FINOT EK 3 2 Changing the Master Filter issie ees de ee ed ee ed ee ed ee RR ed iniaiaiai anakaa 3 2 Resetting Master Filter Meter sesse see se ee se ee ee ke ee Ee ee E ee a ee ee ee ee eke 3 3 deli EO EO ee N cere 3 3 Maintaining the at RR EE EE AE EE RE N 3 4 Seed AE OR RE HE EE ER N 3 5 Table of Contents TFOUDIGSNOOTING mace ET EE EE EE EE RE es Re 8cerment PartS 8 Optional Accessories EE Table of Illustrations Introduction Figure 4 12 Bront View RE EL EE Ge wade LAM ll ee eevee KERSE De Geek Ee Kees 1 6 Figure 1 2 R 12 ACCOSSONIOS ENET 1 8 Figure 1 3 R 134a AccesSOrieS iss ER EE VEE EE Re EK GEE Ee EE EE ER Sk ee Ee EER RR ER ES EER EER EER GESE SeSe EER Geek 1 9
12. hoses or fittings e Wear safety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses If any refrigerant gets into the eyes flush with water and seek a doctor s aid immediately even though irritation may cease e Prevent refrigerant from contacting the skin Expelled refrigerate can cause injury Allow the recycler to run until 15 inHg vacuum is reached Then close the blue service hose valve or coupler Turn the vacuum recycle valve OFF Push the compressor button to turn OFF The COMPRESSOR ON indicator goes out and the compressor stops running 2 6 Installation and Operation Power Up Refer to this section to understand the power up sequence During power up there will be three temporary screens before the Idle Operating screen appears While in the third screen there are four LEDs that light in sequence 1 Connect the power cord to the proper wall outlet with the correct voltage For additional information refer to Chapter 1 Specifications 2 The Dual will power up The following screens will appear in order Software version screen Snap on DUAL II R12 R134a Software rev c 2000 Snap on Setup menu screen SETUP MENU YES TO ENTER NO TO EXIT XX Weight select screen PRESS UP DOWN YES xxLb xxoz xxLb xxKg 3 While in the SETUP MENU screen eight LEDs will light The LEDs will count down the tim
13. unit B Service Hoses Red blue and yellow hoses with shut off adapters for connecting gauge set to the vehicle and your DUAL II unit For additional information refer to Chapter 2 Connecting Service Hoses to DUAL Il and Chapter 2 Connecting Service Hoses to Vehicle 1 9 Introduction Specifications General Operating Storage Capacities Power 120 VAC 60 Hz 12 amps maximum Shipping Weight 200 pounds Dimensions Depth 23 Height 43 Width 26 Operating Temperature Range 50 120 F 10 50 C ambient Maximum Operating Pressure 450 psi Pressure Range 30 inHg 300 psi Temperature 4 158 F 20 70 C Relative Humidity Up to 80 non condensing Refrigerant Charge Amount Per Tank 0 22 Ibs 9 98 kg Recovery Amount Per Tank 0 25 Ibs 11 34 kg Recycled Refrigerant Tank 30 Ib with purge port for each tank 1 10 Introduction E Introduction es Installation and Operation Use the information in this chapter to e Prepare your DUAL II unit for initial use e Recover vehicle refrigerant e Create a vacuum before recharging and e Recharge with recycled refrigerant Connecting Service Hoses to DUAL II Use the following procedure to connect service hoses to your DUAL I unit Refer to Figure 2 1 AWARNING e Do not use your DUAL II unit or any leak detector equipment if R 12 substitutes are suspected R 12 refrigerant substitutes may be flammable e Read unde
14. 14 15 16 17 Storing DUAL II Tip Dual Il onto its back with the pump over a drain pan Drain the oil from the pump Approximately 9 oz of oil should be recovered Tip Dual Il back to the normal upright position If approximately 9 oz of oil is not recovered repeat steps 11 12 Use the plastic bottle supplied with the oil change kit to pour 9 3 oz 275 cc of 3GS compressor oil into the input port of the pump top port Install new O rings on the ends of the tubing and hose assemblies Place a small amount of compressor oil on the O rings and reinstall the tubing assemblies Torque to 65 in Ibs Replace back cover cord wrap master filters and recovery tanks Follow this procedure when storing your DUAL II unit for prolonged periods 3 months or more of time 1 Change the pump oil using Maintaining the Pump procedure in this chapter Close all hand valves on both recovery tanks Remove the yellow hose from both recovery tanks Close the service hose couplings and manifold valves 3 5 Maintenance Troubleshooting Symptom Machine does not turn on Possible Cause Remedy Power cord not plugged in Plug in the power cord No power in A C outlet Check power source Refrigerant not being removed from vehicle Hand valves not open Open hand valves Change tank or Charge refrigerant Recovery tank full Excessive purging of non condensable gases Fitti
15. 7180 823 RE EE n ee oe a Service Fitting high side EAAO1SBCOOAR Recovery Tank 30 pound EAH0014C01A Gauge Assembly with hoses USA Japan Optional Accessories For R 12 For R 134a General EAKOOSOCOTAB ee ee eek ee ek eek ee Master Drier Kit EAH0013C21A Gauge Assembly with hoses Europe EAH0013C22A_ Gauge Assembly with hoses Japan 0647 0281 01 GM Adapter for A F U and W Bodies ACT 111B ee ee ee 2 oz Oil Charge Kit for R 12 EAKOO30CO2AB ee ee eek ee ek ee ee Master Drier Kit EAK0027C00AS Vehicle Adapter Repair Kit O rings EAH0014C12A Gauge Assembly with hoses Europe 1 15080 sege E EERS sg ee ge EE se Low Side Adapter Fitting 1091 0301 01 oe 2 oz Oil Charge Kit for R 134a EAK0029C01AB ees ed ees ee ee ed ee ee Oil Change Kit EEAGSTRAGV eene ese KG ER See A Ee Ne Ge eN ER Rg ee Protective Cover For service or to order replacement parts or optional accessories contact your EquiServ Representative or call 1 800 225 5786 3 8 Maintenance O aMUU 3 9 Maintenance SSS Sa 3 10 Snap on Tools Company Limited One 1 Year Warranty Snap on Tools Company the Seller warrants only to the original purchaser that under normal use care and service the Equipment except as otherwise provided herein shall be free from defects in material and workmanship for one
16. Ge EED DoE GE Se ee Se ee EE sg Ee 1 3 Refrigerant Substitute Warning lt 1 4 aile nde MR N EE EE EEN 1 5 ate TE OE EE ED 1 5 Functional Description EE 1 6 are OE EE ER OE OK 1 6 FR 12 ACCESSOMOS ES 1 8 R1344 Accessories MEER EE De SE ER EE Dee Be GE ee SE Be ee De Ve hierdie diet 1 9 Specifications RE N EE EE Eaa DEEE EEEa 1 10 Ge 1 10 Operating RR ER RE 1 10 Storage AE ER EE EE EE EE 1 10 Capacities KR 1 10 Installation and Operation 2 1 Connecting the Service Hoses to your DUAL II ees eed ee esse ee ese see ee ee ee ee ede ee ee eek ee 2 1 Component elle Uie EE ER OE ER EE 2 2 Preparing and Installing the Recovery Tank ee ee ee ee ee ee ee 2 3 ET dT Ee RR RR ER OE ER E ANERE 2 3 ae dd EE EE EE RE OE N didnt 2 7 Accessing Set Up EE 2 8 Adjusting LCD Contrast sis EER EE DE ENE EES ERG EE Re ESE N ge SEE We ee E EA ENa N 2 8 Accessing Language Select ie ee ee ee ek Ad ek ed ee ee dk ee RR eek ee 2 8 Accessing Weight Select KEER KERE ER vied Re Ge Ek EN ge N ER ie ER EES GESEENDE GREG EG N EE Ge Ke ed anes 2 8 Bol MR RA N OE N ann 2 9 Preliminary Checks MR N IE EE a EE N 2 10 Connecting the Service Hoses to the Vehicle iese di ek se ee eek ee ee ee ee de ee ee ede ee 2 11 Recover Recycle Refrigerant From the Vehicle ies ed ek ed eek ee RR ee ek ee ee 2 12 Purging Non condensable Gas ees ek AA ee Re ee ee ee ee eke ee
17. Installation and Operation Figure 2 1 Service Hoses and Gauge Sets sees dee Re ee ee ee de Re ee ee ee de ee ee Re ee 2 2 Figure 2 2 Recovery Tank and Temperature Probe 2 4 Figure 2 3 Service Hose Connections to the Vehicle ee 2 11 Maintenance Figure 3 1 Master Filter sie ees ese eie ie ER Eg oe es Re LEKE ER Ge EE Ee BAG ER ER E KERE R SEE ERGE EE EER EER EER SEER GE Ek EKEN 3 3 Figure 3 2 PUMPS UN 3 4 iii Trademark and Copyright information Trademark Acknowledgements Snap on is a registered trademark of Snap on Technologies Inc USA and Canada EquiServ is a registered trademark of Snap on Tools Company USA EquiServ is a registered trademark of Snap on Technologies Inc Canada DUAL II is a trademark of Snap on Tools Company USA and Canada Copyright Information DUAL User s Manual 2000 Snap on Incorporated The information specifications and illustrations in this manual are based on the latest information available at the time of printing Snap on reserves the right to make changes at any time without notice Using this Manual Conventions This manual contains instructions for use and setup of your DUAL Il unit A table of contents and table of illustrations are provided to make this manual easy to use Some of the information shown in text or illustrations is obtained using optional equipment A Snap on Sales Representative can det
18. Safety Information Safety Notice For your safety read this manual thoroughly before operating your DUAL Il unit Your DUAL II unit is intended for use by properly trained skilled professional automotive technicians The safety messages presented below and throughout this user s manual are reminders to the operator to exercise care when using this unit There are many variations in procedures techniques tools and parts for servicing vehicles as well as in the skill of the individual doing the work Because of the vast number of test applications and variations in the products that can be tested with this instrument Snap on cannot possibly anticipate or provide advice or safety messages to cover every situation It is the automotive technicians responsibility to be knowledgeable of the system that is to be tested It is essential to use proper service methods and test procedures and to perform tests in an appropriate and acceptable manner that does not endanger your safety the safety of others in the work area the vehicle or equipment being tested It is assumed that the operator has a thorough understanding of vehicle air conditioning systems before using this DUAL II unit This understanding of principles and operating theories is necessary for competent safe and accurate use of this instrument Before using your DUAL unit always refer to and follow the safety messages and applicable test procedures provided by the manufa
19. Two Service Ports on rear of unit The yellow service hose from the gauge set attaches to the service port D Two Oil Drain Valves on sides of unit Used to drain recovered oil from the unit after every recover recycle operation E Two Oil Cups on sides of unit under oil drain valve Used to measure the amount of recovered oil 1 7 Introduction R 12 Accessories Figure 1 2 R 12 Accessories A Gauge Set High and low pressure gauge manifold set monitors air conditioning system pressures Right hand valve opens and closes the high side service hose passage to your DUAL unit Left hand valve opens and closes the low side service hose passage to your DUAL II unit B Service Hoses Red blue and yellow hoses for connecting gauge set to the vehicle and your DUAL II unit For additional information refer to Chapter 2 Connecting Service Hoses to DUAL Il and Chapter 2 Connecting Service Hoses to Vehicle C GM Adapter Connects to the high side service port on GM vehicles D Ford Adapter Connects to the high side service port on Ford vehicles 1 8 Introduction R 134a Accessories Figure 1 3 R 134a Accessories A Gauge Set High and low pressure gauge manifold set monitors air conditioning system pressures Right hand valve opens and closes the high side service hose passage to your DUAL unit Left hand valve opens and closes the low side service hose passage to your DUAL II
20. afety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses If any oil gets into the eyes flush with water and seek a doctor s aid immediately even though irritation may cease Expelled oil can cause injury Engine systems can malfunction expelling fuel oil vapors hot steam hot toxic exhaust gases acid refrigerant and other debris e Wear safety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses e Service should be performed by a certified A C service technician Engine systems that malfunction can cause injury The engine compartment contains electrical connections and hot or moving parts e Keep yourself test leads clothing and other objects clear of electrical connections and hot or moving engine parts e Do not place test equipment or tools on fenders or other places in the engine compartment Contact with electrical connections and hot or moving parts can cause injury Service hoses can not withstand high temperatures or severe mechanical stress e Keep the service hoses away from moving or hot engine parts Service hoses can split or burst causing injury IV Safety Information Risk of explosion if improper tank is used e Do not use any tank with this equipment other than part number EAA0157C00A for R 12 or EAA0158C00A for R 134a
21. aining refrigerant Refrigerant can form combustible mixtures at pressures above atmospheric and with air concentrations greater than 60 by volume e Do not heat a container of refrigerant above 125 F 52 C Explosion can cause injury Risk of fire e Do not use this equipment in the vicinity of spilled or opened containers of gasoline e Do not use your DUAL Il unit or any leak detector equipment if R 12 substitutes are suspected R 12 refrigerant substitutes may be flammable Fire can cause injury Risk of poison e Avoid breathing air conditioning refrigerant and lubricant vapor or mist e Do not allow refrigerant to contact open flame or be drawn into a running engine This can cause refrigerant to become poisonous phosgene gas e Use your DUAL II unit to remove refrigerant from air conditioning systems Exposure can irritate eyes nose and throat Hil Safety Information Oil Lubricant General AAWARNING ie Risk of irritation to mucous membranes e Avoid breathing A C refrigerant and lubricant vapor or mist Exposure may irritate eyes nose and throat To remove HFC 134a from the A C system use service equipment certified to meet the requirements of SAE J2210 HFC 134a Recycling Equipment Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers Exposure can irritate eyes nose and throat Risk of expelling oil under pressure e Wear s
22. are cold this parasitic refrigerant can expand during a vacuum hold cycle a leak test and falsely report a leak condition that does not really exist Follow Vehicle Manufacturer s A C Service Procedures When charging a slow charge condition may occur due to pressure equalization between your DUAL unit and the vehicle A C system Finish charging by e Closing the high side manifold valve e Starting the engine and e Turning the A C system ON 4 Never operate the vehicle A C system with the high side manifold valve open 4 It is the technicians responsibility to be familiar with vehicle manufacturer recommended service procedures Installation and Operation Connecting Service Hoses to Vehicle Figure 2 3 Service Hose Connections to Vehicle A Manifold Gauge Set B Low Side Blue Hose Coupler C High Side Red Hose Coupler D Low Side Blue Hose Fitting E High Side Red Hose Fitting Follow this procedure to connect the service hoses to the vehicle 1 Connect the red high side hose with the service fitting adapter if applicable from the manifold gauge set to the high side service port on the vehicle 2 Connect the blue low side hose with the service fitting adapter if applicable from the manifold gauge set to the low side service port on the vehicle If the vehicle has more than one low side service port use the service port closest to the evaporator 3 Open the hose hand valv
23. cturer of the vehicle or equipment being tested Read All Instructions Read understand and follow all safety messages and instructions in this manual and on the test equipment Safety messages in this section of the manual contain a signal word with a three part message and in some instances an icon Safety Information Power The signal word indicates the level of the hazard in a situation e DANGER indicates an imminently hazardous situation which if not avoided will result in death or serious injury to the operator or bystanders e WARNING indicates a potentially hazardous situation which if not avoided could result in death or serious injury to the operator or bystanders e CAUTION indicates a potentially hazardous situation which if not avoided may result in moderate or minor injury to the operator or bystanders e IMPORTANT indicates a situation which if not avoided may result in damage to the test equipment or vehicle Safety messages in this section contain three different type styles e Normal type states the hazard e Bold type states how to avoid the hazard e Italic type states the possible consequences of not avoiding the hazard An icon when present gives a graphical description of the potential hazard IMPORTANT SAFETY INSTRUCTIONS Risk of a lack of oxygen Vehicle exhaust gases contain carbon monoxide Refrigerant gas can displace air in work area Use your DUAL II unit
24. e cleaning storage or handling E fire water wind lightning or other natural causes F adverse environmental conditions including without limitation excessive heat moisture corrosive elements dust or other air contaminants radio frequency interference electric power failure power line voltages beyond those specified for the Equipment unusual physical electrical or electromagnetic stress and or any other condition outside of Sellers environmental specifications G use of the Equipment in combination or connection with other equipment attachments supplies or consumables not manufactured or supplied by Seller or H failure to comply with any applicable federal state or local regulation requirement or specification governing emission analyzers and related supplies or consumables Repairs or replacements qualifying under this Warrant will be performed on regular business days during Sellers normal working hours within a reasonable time following purchaser s request All requests for Warranty service must be made during the stated warranty period This Warranty is nontransferable Snap on Tools Company Kenosha Wisconsin 53141 1410
25. e recovery tank onto the scale This may damage the scale assembly O Always oil the seals before connecting to any tank filter or fitting A leaky connection or no flow condition may result if the connection is assembled dry O Always close all tank valves clockwise on both recovery tanks when your DUAL unit is not in use 3 1 Maintenance Master Filter Change the master filter when the filter meter has diminished to 0 Ibs 0 oz since the last master filter change The filter monitor has a reset of 95 Ibs During the course of recycling this number decreases until it reaches zero When zero is reached the master filter needs to be replaced and the meter reset Refer to Resetting Master Filter Meter in this chapter The yellow filter indicator will flash and the recovered refrigerant quality may be compromised until the filter is replaced Changing the Master Filter Use the procedure in this section to change the master filter vd Wear safety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses If any refrigerant gets into eyes flush with water and seek a doctor s aid immediately even though irritation may cease Do not remove the master filter while under pressure Perform the maintenance procedure for removing the master filter in this section Prevent refrigerant from contacting the skin Read understand and follow Safety
26. e remaining on the SETUP MENU screen Green LED COMPRESSOR ON Orange LED TANK FULL Orange LED CHANGE FILTER DRYER Red LED HIGH PRESSURE 4 In the unlikely event the LCD screen is unreadable upon power up adjust LCD contrast Refer to Adjusting LCD Contrast in this section 4 After the temporary screens time out the Idle Operating screen will appear XX XX XX lt gt XX XX XX Tare WT lt gt Tare WT XX LB XX oz lt gt XX LB XX oz Empty lt gt Empty The last line will display a bar graph indicating chargeable refrigerant amount in the tank 2 7 Installation and Operation Accessing Setup Setup menus can only be accessed on initial power up of Dual Il Adjusting LCD Contrast Use the procedure in this section to adjust the contrast on the LCD screen with or without being able to read the screen 1 Power up the Dual Il 2 Wait for LEDs to begin lighting and press Y YES button to access Setup Menu 3 Press Y YES button to access Contrast Adjust 4 Press ff UP button to lighten contrast Press U DOWN button to darken contrast 4 If LEDs extinguish before Y YES is selected Dual II will need to be unplugged and powered up again Accessing Language Select Use the procedure in this section to change the language selection of Dual II 1 Power up the Dual Il 2 Press Y YES button to access Setup Menu 3 Press ff UP button to scroll to Language Selec
27. ermine option availability This section contains a list of conventions used in text Service and Manifold Hand Valves Check Note References in text to opening and closing the manifold hand valves assume Clockwise closes the valves and e Counterclockwise opens the valves References in text to opening and closing the service hose valves assume e Valve is open with the lever parallel to the hose and e Valve is closed with the lever perpendicular to the hose References in text to opening and closing the 134a couplers assume e Counterclockwise closes the valves and e Clockwise opens the valves A check note provides additional information about the subject in the preceding paragraph Example 4 For additional information refer to Chapter 2 Connecting Service Hoses to DUAL II and Chapter 2 Connecting Service Hoses to Vehicle Equipment Tips Equipment tips provide information that applies to specific equipment Each tip is introduced by this icon O for easy identification Example O Never attempt to change a recovery tank during unit operation For additional information refer to Chapter 2 Riemoving Recovery Tank Using this Manual Equipment Damage IMPORTANT Situations arise during testing that could damage the vehicle or the test equipment The word IMPORTANT signals these situations Example Failure to follow these instructions could damage the compressor Safety Messages
28. es or service couplers Refer to the vehicle manufacturer s service manual for proper diagnostic procedures and specifications 2 11 Installation and Operation Recover Recycle Refrigerant from Vehicle 4 Be sure that the vehicle is at normal operating 10 temperature before recovering refrigerant Open the blue liquid and red vapor recovery tank valves Connect the service hoses to the vehicle For additional information refer to Connecting Service Hoses to Vehicle in this chapter Open the following Red service hose hand valve or coupler Blue service hose hand valve or coupler High side manifold hand valve Low side manifold hand valve and Yellow service hose hand valve Turn the vacuum recycle valve to RECYCLE Push the compressor button to turn ON The COMPRESSOR ON indicator flashes while a background check is performed and then the compressor activates Refrigerant flows from the vehicle through your DUAL II unit and into the recovery tank As refrigerant is recovered the low side manifold gauge shows increasing vacuum Continue recovering until the low side manifold gauge indicates 15 inHg Close the following High side manifold hand valve and Low side manifold hand valve Turn the vacuum recycle valve to OFF Push the compressor button to turn OFF The COMPRESSOR ON indicator goes out and the compressor stops running Have the graduated cup in i
29. h high and low side manifold hand valves 9 Monitor the high and low side system pressures Refer to the manufacturers specifications for proper operation and diagnosis Installation and Operation 4 When charging a vehicle after evacuation allow for the capacity of the hoses Each hose holds approximately two ounces so the charge amount should be increased by two ounces for each hose used If there is not enough refrigerant in the tank to charge refer to Adding Refrigerant to DUAL II in this chapter Charge is complete Displaying Refrigerant Amount Use this procedure to determine the amount of refrigerant in the recovery tank and the amount able to be charged 1 Press the Mode button until Chargeable weight displays on the LCD with a bar graph 2 This is the total weight of the chargeable refrigerant Tank Full Empty Approximately 3 Ibs of refrigerant is needed to meet the quill tube in the tank This makes the Tank Empty point 3 Ibs Any refrigerant over this amount is usable for charging Messages display when the recovery tank is full or empty 4 The unit may only be used to evacuate and charge an A C system when the recovery tank is full J The unit may be used to recycle or evacuate an A C system when the recovery tank is empty 4 Tank Empty is displayed when the Chargeable weight of the recovery tank is less than approximately 3 Ibs Tank Full is displayed
30. hat may be placed in the engine compartment but many cannot be identified Studies are currently being conducted to develop a procedure to identify the type of refrigerant in a refrigerant system State agencies and the Environmental Protection Agency EPA are moving to ban flammable substitutes If it is suspected that a refrigerant system contains a product of this type e Question the customer about previous service e Be aware of any unfamiliar odor from the system e Do not use any leak detector equipment e Do not use recycling equipment and e Contact your state fire marshall or local EPA office 1 4 Introduction Refrigerant Oils In mobile air conditioning units the lubricant needed for the compressor is blended with the refrigerant Mineral petroleum oils were used with R 12 systems Mineral oils are not soluble in R 134a and the industry had to substitute synthetic lubricating fluids for the mineral oils Polyalkylene glycol oils PAGs were the first synthetics to meet the auto a c compressor manufacturers performance criteria and most automakers and compressor manufacturers devised their retrofit specifications with PAGs in mind Since then polyol ester oils ESTERS or POEs have been tested and also have been found to meet the the performance criteria Although POEs have not been approved by the automakers or a c compressor manufacturers POEs are frequently used in a c retrofits in the automotive aftermarke
31. in locations with mechanical ventilation providing at least four air changes per hour Impairment of breathing can cause injury Risk of electric shock and fire To avoid electric shock the power cord must be connected to a properly grounded A C outlet Do not remove or bypass the grounding pin Use the proper A C outlet for the unit to operate correctly See the ID plate on the back of the unit Extension cords are not recommended If an extension cord must be used use 16 AWG for cords up to 50 and 14 AWG for cords greater than 50 but less than 100 Do not use on wet surfaces or expose to rain Use only fuses with the rating specified near the fuse holder Electric shock and fire can cause injury Il Safety Information Refrigerant Risk of expelling refrigerant under pressure e Wear safety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses If any refrigerant gets into the eyes flush with water and seek a doctor s aid immediately even though irritation may cease e Do not remove master filter while under pressure Perform maintenance procedure for removing master filter in Chapter 3 Changing the Master Filter e Prevent refrigerant from contacting the skin Expelled refrigerate can cause injury Risk of explosion e Do not use compressed shop air for leak detection or to pressure test a system cont
32. ities e Contact your Snap on representative before operating if unsure of condition e Operating your DUAL II unit with the following conditions may reduce its functionality Visible evidence of damage Has been subjected to prolonged storage under unfavorable conditions or Has been subjected to severe transportation stresses 2 9 Installation and Operation Preliminary Checks Successful use of your DUAL II unit depends on several external factors The following information explains these Precondition Vehicle The refrigerant in the vehicle A C system is recovered faster and more completely when the components are warm 1 Connect the service hoses To efficiently recover refrigerant the vehicle should be at normal operating temperature Run the engine until normal operating temperature is reached with e The A C system off and The hood lowered as much as possible without damaging or crimping the service hoses 2 Turn off the engine when normal operating temperature is reached The unit and vehicle are ready to recover and recycle refrigerant Allow Adequate Evacuation Time Evacuate the vehicle system for a minimum of 30 minutes This helps ensure vehicle A C system is free of non condensable gases mostly air and moisture 4 Sometimes a small amount of refrigerant is left in the vehicle A C system that is not practical to recover If recovery time is too short or if vehicle components
33. l Protection Agency EPA and state regulations specify that e Provisions be made to certify all air conditioning service installation and repair personnel e Refrigerant be recovered recycled or reclaimed from automotive air conditioning systems instead of allowing vapors to be expelled or vented into the atmosphere and e Refrigerant be recycled and reused or properly disposed of instead of allowing vapors to be expelled or vented into the atmosphere Mobile air conditioning service installation and repair technicians must be qualified and certified 1 2 Introduction Refrigerant Handling Refrigerant Safety vd Mobile air conditioning systems contain chemical mixtures that require special handling to avoid injury and to avoid venting refrigerant into the atmosphere Do not discharge any refrigerant gas vapor or liquid from a refrigeration system into the atmosphere If service is required that involves opening the refrigerant system use a certified recovery system e Wear safety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses If any refrigerant gets into the eyes flush with water and seek a doctor s aid immediately even though irritation may cease e Do not remove master filter while under pressure Follow instructions for removing master filter For additional information refer to Chapter 3 Changing the Master Fil
34. ng s not properly Tighten fitting s finger tight connected to master filter Leaky service hose or adapter connection drawing in air Tighten fittings or replace seals in finger tight fittings Oil drain valve not fully closed Close oil drain valve Does not charge Blue hand valve on recovery Open blue hand valve tank not open Fitting not properly connected to recovery tank Tighten fitting finger tight No refrigerant in tank Fill tank with refrigerant Leak in vehicle system Repair vehicle system leak Manifold and hose valves not open Open manifold and hose valves Machine does not draw a vacuum Loose hose connection Tighten loose hose connections Oil drain valve open Close oil drain valve Leak in vehicle system Repair vehicle system leak Hissing noise from oil separator during recycle and or vacuum mode Oil drain valve open Close oil drain valve 3 6 Maintenance Refrigerant losses from tank on scale over time Leaky hand valve s on tank Make sure hand valves are either open completely CCW or closed completely CW and leak test Leaky fitting s Oil seal with refrigerant oil and reconnect OR replace fitting oil seal and reconnect Long recycle times e System being recycled is Heat A C system by cold and has components that running engine with hold a substantial amount of A C OFF and keep hood li
35. nk close the virgin tank hand valve 8 Allow the recycler to run until 15 inHg vacuum is reached then close the blue service hose hand valve or coupler 9 Turn the vacuum recycle valve OFF 10 Push the compressor button to turn OFF The COMPRESSOR ON indicator goes out and the compressor stops running Installation and Operation Error Messages Temp Error High PSI When error messages display on LCD screen functions are locked until Dual Il is reset Temperature errors can occur when Dual Il is operating outside the normal temperature range below 45 F or a temperature probe is damaged If this should occur warm the Dual II to normal operating temperature unplug power cord to unit and plug back into a properly grounded A C outlet If the temperature error is still present call service A high pressure error can occur when internal excessive pressure is seen This high pressure will be seen if the red hand valve on the recovery tank is closed the control valve on the control panel is in the off position or the red hose fitting on the recovery tank is not installed or tight While in recovery if this occurs the compressor for that side will shut down Push the compressor button twice to restart If there is excessive air in the tank press the compressor button to turn compressor ON and allow Dual Il to purge Press compressor button again to turn OFF and repair leak High Tank Pressure A high tank press
36. paring and Installing Recovery Tank The recovery tanks are shipped with a dry air charge The charge must be vented and the tanks evacuated before use Use the following procedure to evacuate the dry air from the recovery tanks and install a tank for each refrigerant in your DUAL Il unit e Do not use any tank with this equipment other than part number EAA0157C00A for R 12 or EAA0158C00A for R 134a These tanks are D O T certified for refilling D O T certified tanks are marked D O T 4BA 350 or D O T 4BA 400 e Read understand and follow Safety Information in the front of this manual IMPORTANT Vent and evacuate the recovery tanks before first use An unprepared tank can cause compressor burnout 4 The recovery tanks must have a minimum of 25 inHg vacuum when evacuation is complete If there is not 25 inHg vacuum check connections and repeat the procedure Tank Preparation Follow this procedure to install new recovery tanks in your DUAL II unit New recovery tanks are charged with dry air which must be vented before using AWARNING Wear safety goggles user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses e Cover the blue hand valve port with a shop towel to help prevent debris from becoming projectiles e Read understand and follow Safety Information in the front of this manual 1 Vent dry air by slowly opening blue hand valve on the recovery tank 2
37. ply in your area A refillable virgin tank should be returned to your supplier Recovery Tank A refrigerant tank designed to store refrigerant recovered from a vehicle or transferred from a virgin tank Recover The process of removing refrigerant from a system to prevent release of refrigerant into the atmosphere On your DUAL II unit this process is part of recycle Recycle The process of removing refrigerant from a system filtering drying and storing it in the recovery tank 4 Recycle is the only process that removes refrigerant There is not a separate recovery process 4 Your DUAL II unit is a single pass unit This means refrigerant is filtered and dried before reaching the recovery tank Once in the recovery tank it is ready for reuse There is no separate recycle process to perform Evacuate The process of drawing a vacuum on a refrigerant system to remove air and moisture On your DUAL II unit this process is known as vacuum Charge The process of filling an air conditioning system with refrigerant Purging The process of bleeding off non condensable gases from the recovery tank Stable Scale The situation where the reading from the refrigerant weight measuring device is steady Moving your DUAL II unit causes the liquid refrigerant to slosh around in the recovery tank resulting in an unsteady scale reading Avoid moving your DUAL II unit before taking scale readings vii Using this Manual
38. quid refrigerant closed as much as practical to hold in heat Temperature Error Operating outside normal Warm to normal operating temperature range 45 169 F temperature Temperature probe damaged Call service High PSI Error Red hand valve on recovery Open red hand valve on Internal excessive tank is closed recovery tank pressure Control valve on control Open control valve on panel is closed control panel Red hose fitting on the Install or tighten red hose recovery tank is not installed fitting on recovery tank or tight High Tank Pressure Excessive air in tank Press compressor button Excessive tank to turn ON allow unit to pressure purge press compressor button to turn OFF and fix leak Weight Error No tank on the scale Replace recovery tank Recovery tank full or Empty recovery tank overloaded Scale circuitry malfunctions Call service 3 7 Maintenance Replacement Parts For R 12 For R 134a Part Number Description 127580 e AG eee ah GM Adapter high side 1 27680 GM Ford Adapter Quick Disconnect 1 27380 Large GM Adapter Quick Disconnect Ee AE EE EE Ford Adapter EAAO157COOAR Recovery Tank 30 pound EAH0013C00A Gauge Assembly with hoses USA Part Number Description Ee RR LR Service Fitting low side d 2
39. rasp the plug and pull to disconnect e Let the equipment cool completely before putting it away Loop the power cord loosely in proper location when storing Operation of your DUAL II unit by anyone other than qualified personnel may result in injury Safety Information Risk of refrigerant leakage e Hose couplings are not self closing Always close the valves on the gauge set before disconnecting a hose Loosened hose couplings can leak refrigerant into the atmosphere Misdiagnosis may lead to incorrect or improper repair and or adjustment e Do not rely on erratic questionable or obviously erroneous test information or results If test information or results are erratic questionable or obviously erroneous make sure that all connections are correct and that the test procedure was performed correctly Refer also to the Maintenance Troubleshooting section and perform tests and make repairs as required If test information or results are still suspicious do not use them for diagnosis Contact your Snap on Representative Improper repair and or adjustment may cause vehicle or equipment damage or unsafe operation SAVE THESE INSTRUCTIONS VI Table of Contents Safet MEEL EO OE NEE EA AE ee EE er ee 0POOUGMMO OO RE ER NE EE 1 1 Refrigerat 886 1 2 Reirigerant Handling i s sr Ese Ver ged HE SR EE NE SR Ke GREG ER RE ED ER Ve be ee ee gee Ee on 1 3 Refrigerant Safety visse EE WEE SERS Re GR aa ee ge
40. roceeding Refer to Evacuating Service Hoses in this Chapter 1 Open the blue liquid and red vapor recovery tank valves 2 Connect the service hoses to the vehicle For additional information refer to Connecting Service Hoses to Vehicle in this chapter 3 Open the following Red service hose hand valve or coupler Blue service hose hand valve or coupler High side manifold hand valve Low side manifold hand valve and Yellow service hose hand valve 4 Turn the vacuum recycle valve to VACUUM 5 Push the compressor button to turn ON The COMPRESSOR ON indicator flashes while a background check is performed and then the compressor activates The low side manifold gauge shows vacuum increasing J Follow the manufacturer recommendations for evacuation time usually at least 30 minutes 6 Close the manifold hand valves when the desired vacuum and duration have been reached 7 Turn the vacuum recycle valve OFF 8 Push the compressor button to turn OFF The COMPRESSOR ON indicator goes out and compressor stops running 9 Monitor the low side pressure for 5 minutes Any rise in vacuum indicates a leak in the vehicle system 4 If the source of the leak cannot be determined partially charge the system and perform a leak test using an electronic leak detector 10 When the leak is identified repeat Recover Recycle procedure repair the leak and attempt the Evacuation procedure again Evacua
41. rstand and follow Safety Information in the front of this manual e Refer to Page 1 4 4 Confirm refrigerant type in vehicle and use the appropriate connections on the unit Always lubricate rubber gaskets and seals at hose connections with fresh refrigerant oil before connecting Tighten hose connections finger tight including master filter connections Use electronic leak detector to insure connections are leak free 1 Attach end of yellow hose without hand valve to center port of manifold gauge assembly 2 Attach end of yellow hose with hand valve to appropriate port on back panel 3 For R 12 Attach the end of the blue hose without hand valve to the low side left port of the manifold gauge assembly Attach the end of the red hose without hand valve to the high side right port of the manifold gauge assembly For R 134a Connect the high red and low blue couplers to their respective hoses Rotate coupler knobs fully CCW closed Installation and Operation Component Identification F ie Yellow Figure 2 1 Service Hoses and Gauge Sets R 12 A Low Side Blue Hose Fitting B Hand Valve C High Side Red Hose Fitting D Hand Valve E Hand Valve F Service Port Fitting R 134a G Low Side Blue Hose Coupler with valve H High Side Red Hose Coupler with valve Hand Valve J Service Port Fitting 2 2 Installation and Operation Pre
42. t Refrigerant Oil Safety vd Risk of irritation of mucous membranes e Wear safety goggles and protective gloves user and bystander Everyday eyeglasses only have impact resistant lenses they are NOT safety glasses If any refrigerant gets into the eyes flush with water and seek a doctor s aid immediately even though irritation may cease e Avoid breathing A C refrigerant and lubricant vapor or mist Exposure may irritate eyes nose and throat To remove HFC 134a from the A C system use service equipment certified to meet the requirements of SAE J2210 HFC 134a Recycling Equipment Additional health and safety information may be obtained from refrigerant and lubricant manufacturers Exposure can irritate eyes nose and throat 1 5 Introduction Functional Description Front View Figure 1 1 Front View A Two Gauge Sets High and low pressure gauge manifold set for monitoring air conditioning system pressures Right hand valve opens and closes the high side service hose passage to your DUAL unit Left hand valve opens and closes the low side service hose passage to your DUAL II unit B Control Panel Houses display screen indicator lights and control buttons Mode Button Changes LCD display between tare weight chargeable weight and refrigerant amount remaining before master filter change Press and hold to zero tare weight display 1 6 Introduction Two Control Knobs Used to select
43. t and press Y YES 4 Press ff UP button to scroll through English French or Spanish 5 Press Y YES button to select language Accessing Weight Select Use the procedure in this section to change the refrigerant weight measurement 1 Power up the Dual Il 2 Press N NO button to skip Setup Menu Press ff UP or 2 DOWN button to scroll through ID oz Ib or kg 4 Press Y YES to select units of weight measurement 2 8 Installation and Operation Operation IMPORTANT This section contains e Procedures for connecting the service hoses to the vehicle and e Procedures to Recycle vehicle refrigerant Create a vacuum in the A C system before recharging and Recharge the A C system with recycled refrigerant After performing all of the installation procedures follow these recommended vehicle service procedures before using your DUAL II unit for A C work Keep the service hoses away from moving or hot engine parts The service hoses can not withstand high temperatures or severe mechanical stress e Close the tank valves when not using your DUAL II unit Leaving tank valves open may result in refrigerant loss from tank e Do not use your DUAL II unit outside of the following limits Warmer than 49 C 120 F Colder than 10 C 50 F and or Relative humidity greater than 80 e Stabilize your DUAL IlI unit to a moderate temperature and inspect for abnormal
44. ter e Prevent refrigerant from contacting the skin e Read understand and follow Safety Information in the front of this manual e Use your DUAL II unit in locations with mechanical ventilation providing at least four air changes per hour e Avoid breathing air conditioning refrigerant and lubricant vapor or mist e Do not allow refrigerant to contact open flame or be drawn into a running engine This can cause refrigerant to become poisonous phosgene gas e Use your DUAL Il unit to remove refrigerant from air conditioning systems e Read understand and follow Safety Information in the front of this manual e Tighten all tubing connections properly Insufficient or excessive torque can result in loose joints or deformed parts Either condition can result in refrigerant leakage 1 3 Introduction Refrigerant Substitute Warning e Do not use your DUAL II unit or any leak detector equipment if R 12 substitutes are suspected R 12 refrigerant substitutes may be flammable e Read understand and follow Safety Information in the front of this manual Aftermarket R 12 refrigerant substitutes are being sold that are dangerous or potentially flammable gases These products contain a blend of butane isobutane and propane and have the potential for explosion Some of these products are e OZ 12 e Refrigerant 176 e Arctic Chill R 176 and e GHG Refrigerant 12 Some vehicles using OZ 12 can be identified by a label t
45. tion is complete Installation and Operation Charging A C System Open the blue liquid and red vapor recovery tank valves 2 Press and hold the Mode Button for 5 seconds so a tare weight of 0 0 is displayed 3 Connect the service hoses to the vehicle For additional information refer to Connecting Service Hoses to Vehicle in this chapter 4 Open the following Red service hose hand valve or coupler Blue service hose hand valve or coupler High side manifold hand valve Low side manifold hand valve and Yellow service hose hand valve 5 Turn charge valve to CHARGE Refrigerant flows from the tank into the vehicle 7 Monitor the tare weight When the desired tare weight is reached close the charge valve The refrigerant flow stops 4 If the desired charge amount cannot be reached Close the high and low side manifold hand valves Start the engine Run the A C system Open the low side manifold hand valve and charge valve Monitor the tank weight and close the charge valve when the desired tare weight is reached 4 When charging a slow charge condition may occur due to pressure equalization between your DUAL II unit and the vehicle A C system Finish charging by Closing the high side manifold valve Starting the engine and Turning the A C system ON J Never operate the vehicle A C system with the high side manifold valve open 8 Close bot
46. ts holder under the oil drain valve Drain waste oil by slowly opening the oil drain valve Any accumulated oil expels into the cup v Accumulator separator is pressurized to expel waste oil if Dual Il recovers 8oz of refrigerant or more If less than 8oz is recovered there is no need to drain waste oil Installation and Operation 11 Close the valve immediately when all of the oil is expelled The amount indicated on the cup is the amount to add back into the vehicle system when recharging Discard refrigerant oil in accordance with the laws in 12 13 your area Monitor the low side manifold pressure gauge for about 2 minutes No change indicates recovery is complete Continue with system repair and or evacuation A pressure increase indicates more recovery time is required or the vehicle A C system has a leak Repeat steps 3 through 10 If the gauge reading still increases add a partial charge to the system and leak test with an electronic leak detector to find the leak Close the red and blue service hose hand valves or couplers Purging Non condensable Gas Purging non condensable gases is an automatic feature executed by the Dual Il Installation and Operation Evacuating A C System Use this procedure to remove non condensible gases and moisture from the vehicle A C system 4 If the gauges indicate pressure recover refrigerant from the service hoses before p
47. ue liquid recovery tank valve Connect the blue service hose from the manifold gauge assembly to the tank of virgin refrigerant 4 Position the virgin tank with the valve up Do not use the virgin tank with the valve underneath the tank For R 134a install the supplied tank adapter between the tank valve and the blue hose 2 5 Installation and Operation vd 23 24 25 Open the following Virgin tank valve Yellow service hose hand valve Blue service hose hand valve or coupler CW and Low side manifold hand valve Turn the vacuum recycle valve to RECYCLE Push the compressor button to turn ON The COMPRESSOR ON indicator flashes while a background check is performed and then the compressor activates The refrigerant flows from the virgin tank through your DUAL II unit and into the prepared recovery tank 4 Press the mode button until Chargeable Weight is 26 27 28 29 displayed Monitor the weight on the LCD display until the desired amount of virgin refrigerant has been transferred A minimum of 6 Ibs of refrigerant needs to be in the recovery tank before a charge operation can be accomplished Refer to Tank Full Empty in this Chapter When the desired amount of refrigerant has been transferred into the recovery tank close the virgin tank hand valve Risk of expelling refrigerant under pressure e Always close the tank valves before removing the
48. ure error can occur if air pressure in the recovery tank reaches 350 psi This high pressure will be seen if there is excessive air in the recovery tank If this occurs press the compressor button to turn compressor ON and allow Dual Il to purge Press compressor button again to turn OFF and repair leak Weight Error A weight error will occur if one of these conditions arises There is no tank on the scale The tank is full or overloaded or The scale circuitry malfunctions If this should occur Replace the recovery tank Empty a portion of the recovery tank into a certified tank or Call service to repair the scale circuitry Installation and Operation 2 20 Equipment Tips Maintenance Use this chapter to maintain your DUAL II units e Master filters e Pumps and e When storing the unit for prolonged periods Troubleshooting information and a list of parts and accessories are also included MA stable scale weight reading with the refrigerant not moving around in the recovery tank is needed at the beginning and end of a recycle or charge program Do not lean on or move the unit at these times O Never attempt to change the recovery tank while your DUAL Il unit is in use O Always evacuate the service hoses before disconnecting them from your DUAL II unit or the manifold gauge set For additional information refer to Chapter 2 Evacuating Service Hoses O Never drop th
49. when the Chargeable amount of refrigerant in the recovery tank is 22 lbs Removing Recovery Tank 1 2 Ensure both valves on the recovery tank are closed Disconnect the hoses from the recovery tank Remove the temperature probe from the elastic band on the recovery tank Gently remove the recovery tank from the scale Remove the elastic band from the recovery tank Installation and Operation Evacuating Service Hoses Evacuate the service hoses before removing them from the manifold gauge assembly and whenever contamination is suspected Service hoses are not connected to a vehicle during this procedure 1 2 Close the red and blue service hose hand valves Open the manifold valves Plug the power cord into a properly grounded A C outlet See the ID plate on the back of the unit for the correct A C voltage Wait for LED s to extinguish and LCD display to show Idle Operating screen Turn the vacuum recycle valve to RECYCLE Push the Compressor button to turn ON The COMPRESSOR ON indicator flashes while a background check is performed and then the compressor activates Refrigerant flows through your DUAL unit and into the recovery tank Monitor the manifold gauges Service hose evacuation is complete when 15 inHg of vacuum is reached Turn the vacuum recycle valve to OFF Push the compressor button to turn OFF The COMPRESSOR ON indicator goes out and the compressor stops running
50. year fro the date of original invoice Items such as leads probes external hoses adapters and all other attachments supplies and consumables except as otherwise provided herein are warranted for 90 calendar days from the date of original invoice Filter elements are not warranted SELLER S OBLIGATIONS UNDER THIS WARRANTY ARE LIMITED SOLELY TO THE REPAIR OR AT SELLER S OPTION REPLACEMENT OF EQUIPMENT OR PARTS WHICH TO SELLER S SATISFACTION ARE DETERMINED TO BE DEFECTIVE AND WHICH ARE NECESSARY IN SELLER S JUDGEMENT TO RETURN THIS EQUIPMENT TO GOOD OPERATING CONDITION NO OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL APPLY AND ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED This warranty does not cover and separate charges for parts labor and related expenses shall apply to any damage to malfunctioning inoperability or improper operation of the Equipment caused by resulting from or attributable to A abuse misuse or tampering B alteration modification or adjustment of the Equipment by other than Seller s authorized representatives C installation repair or maintenance other than specified operator maintenance of the Equipment or related equipment attachments peripherals or optional features by other than Seller s authorized representatives D improper or negligent use application operation car
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