Snap-On Dual 3412, User Manual

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...................................................................................................... 1-1

Refrigerant Gases  .................................................................................................................... 1-2

Refrigerant Handling .................................................................................................... 1-3
Refrigerant Safety  ...................................................................................................... 1-3
Refrigerant Substitute Warning .................................................................................... 1-4

Functional Description .............................................................................................................. 1-5

Typical Front View  ...................................................................................................... 1-5
R-12 Accessories ........................................................................................................ 1-8
R-134a Accessories  .................................................................................................... 1-9

Specifications .......................................................................................................................... 1-10

General .................................................................................................................... 1-10
Operating .................................................................................................................. 1-10
Storage .................................................................................................................... 1-11
Capacities ................................................................................................................ 1-11

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................................................................................ 2-1

Connecting Service Hoses To Dual 3412  .................................................................... 2-1

Component Identification .......................................................................................................... 2-2

Preparing and Installing Recovery Tank  ...................................................................... 2-3

Operation .................................................................................................................................. 2-6

Preliminary Checks ...................................................................................................... 2-7
Connecting Service Hoses To Vehicle  ........................................................................ 2-9
Recover/Recycle Refrigerant From Vehicle ................................................................ 2-10
Purging Non-condensable Gas .................................................................................. 2-11
Evacuating A/C System  ............................................................................................ 2-12
Charging A/C System ................................................................................................ 2-13
Displaying Refrigerant Amount  .................................................................................. 2-14
Tank Full/Empty  ........................................................................................................ 2-14
Removing Recovery Tank .......................................................................................... 2-14
Evacuating Service Hoses  ........................................................................................ 2-14
Adding Refrigerant To Dual 3412  .............................................................................. 2-15

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...................................................................................................... 3-1

Equipment Tips  .......................................................................................................... 3-1

Master Filter .............................................................................................................................. 3-2

Moisture Indicator ........................................................................................................ 3-2
Master Filter Maintenance Schedule - R12 .................................................................. 3-3
Master Filter Maintenance Schedule - R134a .............................................................. 3-5
Changing the Master Filter .......................................................................................... 3-6

Pump ........................................................................................................................................ 3-7

Maintaining the Pump .................................................................................................. 3-7

Prolonged Storage of Dual 3412 .............................................................................................. 3-8
Troubleshooting ........................................................................................................................ 3-9

Replacement Parts .................................................................................................... 3-10
Optional Accessories  ................................................................................................ 3-10

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