Snap-On Dual 3412 User Manual

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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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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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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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Snap-On Dual 3412 Specifications

General

Brand	Snap-On
Model	Dual 3412
Category	Air Conditioner
Language	English

Summary

Using this Manual and Safety

Manual Conventions and Terms

Explains text conventions, symbols, notes, and defines key terms used in the manual.

Safety Guidelines and Warnings

Provides comprehensive safety instructions for operation, handling refrigerants, and electrical hazards.

Introduction to Dual 3412

Refrigerant Information

Explains refrigerants R-12 and R-134a, their properties, and environmental impact.

Unit Components and Specifications

Illustrates and describes unit components, and lists technical specifications.

Installation and Operation

Connecting Hoses and Preparing Unit

Guides on connecting hoses to the unit and preparing the recovery tank for use.

Core Operation Procedures

Detailed steps for recovering, purging, evacuating, and charging A/C systems.

Refrigerant Management and Hose Evacuation

Covers displaying refrigerant amount, tank status, and evacuating service hoses.

Adding Virgin Refrigerant

Step-by-step guide for adding virgin refrigerant to the Dual 3412 unit.

Maintenance and Support

Equipment Tips and Filter Maintenance

Provides usage tips and instructions for master filter maintenance and tracking.

Pump and Storage Procedures

Details pump maintenance, including oil changes, and procedures for storing the unit.

Troubleshooting and Parts

Lists common issues, remedies, replacement parts, and optional accessories.