This book turns every “How does this even work?” moment into “Ohhh, I got this.” You know that feeling when you open a plugin and your brain just… freezes? Gone. With this book, you'll finally understand what you're doing, why you're doing it, and yes — even the compressor’s mysterious humming will start to make perfect sense.
Ready to dive deeper? The official NIMI Refrigerator & AC Trade Book is your complete source for step-by-step learning, diagrams, and real workshop knowledge. Get your copy below and start mastering the trade the right way.

The NIMI Refrigeration & Air Conditioning book is designed to give trainees true clarity in every core concept of cooling systems.
NIMI Refrigeration & Air Conditioning Book
Buy Now 		It explains the refrigeration cycle, components, circuits, and servicing procedures in a way that feels practical and easy to absorb. With updated industry-relevant content, it bridges the gap between classroom learning and real workshop tasks.

Watch and Learn with NIMI!

Want to see Refrigeration & Air Conditioning systems in action before diving into the book?

Head over to the official NIMI Digital YouTube Channel (@NIMIDIGITALENGLISH) and explore the Refrigeration & Air Conditioning Trade playlist.

Videos are available in multiple languages:

English Hindi Tamil Telugu Kannada Malayalam Bengali Marathi Punjabi

Each video shows real workshop demonstrations—component identification, circuit tracing, gas charging, system servicing, installation techniques, and troubleshooting.

Perfect for visual learners who want to see how RAC systems work before trying them hands-on.

Module 1: Fitting

Before you can master compressors, refrigerants, or split AC installations, you need strong foundational skills. Module 1: Fitting sets the stage by training you to handle workshop tools, follow safety procedures, and execute precision operations.

You’ll learn:

  • Identify workshop machinery, hand tools, and measuring instruments
  • Understand safety precautions, PPE usage, and first-aid essentials
  • Work confidently at height with proper equipment and hazard awareness
  • Master basic fitting skills like marking, punching, filing, and hacksawing

These skills may look simple at first, but they are the core of every repair, installation, and service task you’ll perform in the field. Whether you’re cutting copper tubing or aligning a compressor bracket, fitting knowledge ensures accuracy, safety, and efficiency.

Module 2: Sheet Metal

The Refrigeration & Air Conditioning trade requires technicians to work with sheet metal components like ducts, covers, panels, and brackets.

This module teaches you:

  • Cut sheet metal using straight and bent snips
  • Perform bending, folding, and joining operations
  • Use rivets, snap tools, and other joining techniques

These operations are indispensable when repairing refrigerator bodies, AC indoor unit panels, or custom-fitting ducts.

Module 3: Electrical

Since every refrigerator and AC unit relies on electrical systems, the electrical fundamentals in this module are critical.

You’ll learn:

  • Handle electrical tools with proper safety
  • Measure voltage, current, frequency, and power
  • Use analog and digital meters
  • Understand single-phase circuits

This module strengthens your electrical troubleshooting skills, making fault finding in compressors, motors, and control circuits much easier.

Module 4: Electronics

Modern Refrigeration & Air Conditioning systems depend heavily on electronic components.

You’ll explore:

  • Basic electronic components like resistors, capacitors, diodes, transistors, and amplifiers
  • Colour coding of resistors
  • Soldering and de-soldering techniques
  • Full-wave rectifiers and bridge rectifier circuits

This helps you work confidently with PCB boards, inverter controls, sensors, and modern Refrigeration & Air Conditioning electronics.

Module 5: Welding

From copper lines to sheet metal fixtures, welding appears everywhere in the Refrigeration & Air Conditioning trade.

This module covers:

  • Gas welding equipment
  • Safety precautions during Oxy-Acetylene operations
  • Flame setting, brazing, and welding techniques
  • Brazing copper to copper, copper to steel, and copper to brass

Brazing is especially crucial in Refrigeration & Air Conditioning systems for joining refrigeration pipes and ensuring leak-proof connections.

Module 6: Basic Refrigeration

This is where the magic begins.

You’ll learn:

  • Identify Refrigeration & Air Conditioning tools and general service equipment
  • Learn the working of vapour compression and absorption systems
  • Bend, flare, swage, and braze copper tubing
  • Understand refrigeration components like condensers, evaporators, driers, capillary tubes, and compressors

This module introduces the refrigeration cycle, the beating heart of all cooling systems.

Module 7: Refrigerator Direct Cool

Now that you know the parts, it's time to assemble and troubleshoot them.

You’ll learn:

  • Identify electrical and mechanical components of direct cool refrigerators
  • Trace circuits and test electrical parts
  • Perform leak testing, evacuation, and gas charging
  • Replace capillary tubes and driers
  • Clean evaporators and condensers

By the end, servicing a direct cool fridge becomes second nature.

Module 8: Frost-Free Refrigerator

Frost-free systems add complexity with heaters, timers, fans, and sensors.

You’ll learn:

  • Trace frost-free circuits
  • Diagnose and test electrical components
  • Inspect air distribution systems
  • Perform mechanical and electrical servicing

This module prepares you for today’s commonly used home refrigerators.

Module 9: Refrigerator (Inverter Technology)

The future of refrigeration.

This module helps you:

  • Understand inverter-controlled systems
  • Identify three-door and four-door refrigerators
  • Test inverter components

These skills are essential as inverter appliances dominate the market.

Module 10: Compressor & Motor

You’ll dive deep into:

  • Types of compressors (reciprocating, rotary, sealed, variable-speed)
  • Dismantling and identifying compressor parts
  • Testing motors and terminals
  • Checking continuity, earth, windings, and running currents

If you ever wondered why the compressor hums the way it does, this module answers it.

Module 11: Condenser

Before the cooling magic reaches your room, the condenser does some serious behind-the-scenes work. This module helps you understand how heat is pushed out and why condenser health decides overall performance.

You’ll Learn:

  • Types of condensers used in refrigerators and AC units
  • Cleaning, flushing, and maintenance procedures
  • Performing leak tests to ensure system safety

A healthy condenser means better cooling and lower power consumption. Understanding its servicing keeps systems efficient and prevents overheating failures.

Module 12: Drier & Expansion Valve

Inside every RAC system, these tiny components control moisture and refrigerant flow like silent superheroes. This module shows you how they protect the heart of the system from internal damage.

You’ll Learn:

  • Capillary tubes, filter driers, and their functions
  • Expansion valves and refrigerant flow control
  • Replacing and servicing flow control components

These components protect the refrigeration circuit from moisture and blockages. Knowing how to service them makes your repairs accurate and compressor-safe.

Module 13: Evaporator

This is the place where warm air turns into cool comfort. This module gives you clarity on evaporators so you can detect issues early and boost system performance.

You’ll Learn:

  • Types of evaporators used in RAC systems
  • Leak testing with dry nitrogen

The evaporator is where cooling actually happens. Proper servicing ensures strong cooling performance and prevents return calls from customers.

Module 14: Refrigerant

Refrigerants are the lifeblood of every cooling system — and handling them requires skill, safety, and precision. This module trains you to work with gases the right way.

You’ll Learn:

  • Safe handling of refrigerants
  • Gas recovery, transfer, and charging
  • Colour codes & environmental safety
  • Recover refrigerant from a faulty machine

Handling refrigerant correctly is essential for safety, compliance, and system performance. These skills make you a responsible and professional RAC technician.

Module 15: Thermal Insulation

Cooling isn’t just about machines — it’s also about keeping the cold where it belongs. This module shows you how insulation reduces losses and improves overall efficiency.

You’ll Learn:

  • Types of insulation like PUF and glass wool
  • Proper insulation practices in AC and refrigeration systems
  • Identifying and fixing insulation faults

Good insulation reduces cooling loss and improves energy efficiency. This module ensures your installations stay efficient, sealed, and long-lasting.

Module 16: Window Air Conditioner

Window ACs may look simple, but there’s a lot happening inside that compact box. This module prepares you to handle one of the most common RAC systems in India.

You’ll Learn:

  • Acquaint with mechanical and electrical components used in window A/C
  • Circuit tracing and testing
  • Installation, leak testing & gas charging

Window ACs are still widely used across India. Mastering them prepares you for the most common service calls and builds strong real-world confidence.

Module 17: Split AC

Split ACs are sleek, modern, and everywhere — from homes to offices. This module gives you the expertise to install, service, and troubleshoot them like a pro.

You’ll Learn:

  • Components of IDU & ODU
  • Fault diagnosis and system testing
  • Installation, vacuuming, brazing & multi-split servicing
  • Inverter split AC components and controls

Split ACs dominate today’s residential and commercial market. These skills make you job-ready, installation-ready, and industry-ready from day one.

Each module builds your confidence to handle everything—from a simple domestic refrigerator to a complex inverter split AC unit.

Learning Outcomes:

By completing this book, you gain the power to:

  • Identify hazards, follow safety procedures, and handle RAC tools
  • Produce accurate fitting and sheet metal jobs
  • Perform electrical and electronic measurements confidently
  • Solder, weld, braze, and assemble refrigeration components
  • Diagnose faults in compressors, condensers, evaporators, and motors
  • Service direct cool, frost-free, window AC, and split AC systems
  • Recover refrigerant, test for leaks, and charge systems correctly
  • Install RAC units with proper wiring, insulation, and safety checks

This book doesn’t just make you exam-ready — it makes you industry-ready, job-ready, and future-ready.

The biggest strength of the NIMI Refrigeration & Air Conditioning Technician Practical Book is the balance between:

  • Practical, workshop-based learning
  • Clear theory explained in simple language
  • Diagrams, circuit tracing, and step-by-step procedures
  • Skills that match real service-center and industry needs

Whether you're repairing a direct cool fridge, installing a split AC, or troubleshooting an inverter compressor — this book teaches you the right way to do it.

Your Career in Cooling Starts Here

The Refrigeration & Air Conditioning trade is one of the most in-demand, skill-based, and ever-growing technical fields. With homes, offices, malls, hospitals, labs, cold storage, and industries relying on cooling systems — skilled Refrigeration & Air Conditioning Technicians are needed everywhere.

And the best part?

You’re learning from India’s official, trusted, and industry-standard source — NIMI.

The NIMI Refrigeration & Air Conditioning Technician Practical Book is more than a textbook. It’s your blueprint to becoming a confident, skilled, and professional Refrigeration & Air Conditioning Technician. Master the modules. Practice the skills. And step into a career that keeps the world cool.