Complete Guide to R22 Replacement Refrigerants

R22 REPLACEMENT SOLUTIONS

T EC HN IC A L

G U I D E

Technical Guide

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HV A C

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R E FRI G ER A TI ON

R22 Replacement Solutions A practical guide to compliant, cost-effective refrigerant alternatives for legacy air conditioning and refrigeration systems Inside this guide • What R22 replacement refrigerants are and how they work • The regulatory timeline behind the R22 phase-out • Benefits of modern alternatives and drop-in compatibility • A closer look at RS-70, MO99 and R407C • Retrofit considerations and the professional conversion process • Compliance, sustainability and choosing the right path forward

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R22 REPLACEMENT SOLUTIONS

Technical Guide

01 · OVERVIEW

Introduction R22 refrigerant, also known as HCFC-22, was widely used in air conditioning and refrigeration systems for many years due to its reliable cooling performance and energy efficiency.

However, because R22 contributes to ozone depletion and has a high environmental impact, its production and use have been phased out across many countries, including the UK and Europe.

As a result, businesses and homeowners operating older HVAC systems now face increasing maintenance costs, refrigerant shortages, and compliance concerns. Modern R22 replacement solutions provide a practical solution that allows existing systems to continue operating without the immediate expense of full equipment replacement.

What Is an R22 Replacement?

An R22 replacement refrigerant is an alternative gas designed to replace R22 in older air conditioning and refrigeration systems. These replacement refrigerants are formulated to deliver similar cooling performance while reducing environmental impact and complying with modern regulations. Most replacement refrigerants are classified as: • Drop-in replacements • Retrofit refrigerants • Lower Global Warming Potential (GWP) alternatives • Non-ozone-depleting refrigerants Popular alternatives include R453A (RS-70 / RS-44b), R407C, R422D, and R438A (MO99).

02 · BACKGROUND

Why R22 Was Phased Out R22 belongs to a category of refrigerants called HCFCs (Hydrochlorofluorocarbons), which have been linked to ozone layer depletion. International environmental agreements such as the Montreal Protocol led to the gradual phase-out of HCFC refrigerants.

Key Regulatory Milestones

Year

Regulation Impact

2003

R22 banned in new air conditioning systems in the UK

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R22 REPLACEMENT SOLUTIONS

Year

Regulation Impact

2010

Virgin R22 banned for servicing and maintenance

2015 onward

Reclaimed R22 heavily restricted and increasingly unavailable

Technical Guide

The Resulting Impact - The phase-out has caused: • Rising refrigerant prices • Reduced availability • Difficulty sourcing compatible components • Increased maintenance expenses for older systems 03 · BENEFITS

Benefits of Modern R22 Replacement Refrigerants 1. Lower Environmental Impact Modern refrigerants are designed with lower ozone depletion potential and reduced environmental harm compared to traditional R22. Some alternatives also offer: • Lower Global Warming Potential (GWP) • Improved energy efficiency • Better regulatory compliance Industry Note RS-70 (R453A), for example, is marketed as one of the lowest GWP drop-in replacements for R22.

2. Drop-In Compatibility Many R22 replacement refrigerants are designed as “drop-in” alternatives, meaning they can often be used with minimal system modifications. Advantages include: • Reduced downtime • Lower retrofit costs • Minimal equipment changes • Faster servicing Certain products are compatible with existing mineral oils and alkylbenzene lubricants, reducing the need for complete oil replacement.

3. Extended Equipment Life

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R22 REPLACEMENT SOLUTIONS

Technical Guide

Replacing R22 with a compatible refrigerant can significantly extend the life of existing HVAC equipment, delaying the need for costly full-system replacement. This is especially valuable for: • Commercial buildings • Retail stores • Warehouses • Industrial refrigeration systems • Older residential air conditioning systems

4. Improved Serviceability Because R22 is increasingly scarce and expensive, many HVAC engineers now recommend conversion to approved alternatives for easier maintenance and future servicing. Several technicians in HVAC communities report commonly using alternatives such as: • R422B • R422D • R438A (MO99) • R407C • R453A 04 · PRODUCT PROFILES

Common R22 Replacement Refrigerants Below are three of the most widely used alternatives, each suited to slightly different applications and budgets.

RS-70 R453A RS-70 is a non-flammable drop-in refrigerant designed specifically as an R22 replacement for both air conditioning and refrigeration applications.

KEY FEATURES

▸ Similar cooling capacity to R22 ▸ Comparable operating pressures ▸ Lower GWP than many alternatives ▸ Compatible with existing lubricants ▸ Suitable for capillary and TXV systems

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R22 REPLACEMENT SOLUTIONS

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MO99 R438A MO99 is widely used as a retrofit solution for older R22 systems. Many HVAC professionals recommend it as a practical and cost-effective replacement.

ADVANTAGES

▸ Good compatibility with existing systems ▸ Widely available ▸ Suitable for residential HVAC applications ▸ Lower servicing complexity

R407C Retrofit Alternative R407C is another popular alternative commonly used in retrofitted systems, though it typically requires more involved system preparation.

IMPORTANT NOTES

▸ Often requires oil changes ▸ System flushing may be necessary ▸ May involve gasket replacement ▸ Slight cooling capacity reduction possible

05 · PLANNING

Important Considerations Before Retrofitting Before replacing R22 refrigerant, several technical factors should be assessed.

System Age: Very old systems may not justify retrofit costs if: • Compressors are failing • Corrosion is severe • Energy efficiency is poor In some cases, full replacement may be more economical long term.

Oil Compatibility: Different refrigerants require different lubricants. Some refrigerants: • Work with mineral oil • Require POE oil • Need partial oil replacement • Require gasket or seal upgrades

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R22 REPLACEMENT SOLUTIONS

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Technicians often recommend checking oil compatibility before conversion.

Performance Changes: After retrofit: • Cooling capacity may slightly decrease • Operating pressures can change • TXV adjustments may be required • System efficiency can vary Best Practice Professional commissioning and testing are essential after every retrofit to verify safe and efficient operation.

06 · DIAGNOSTICS

Signs Your System May Need an R22 Replacement Common indicators include: • Rising energy bills • Poor cooling performance • Refrigerant leaks • Compressor issues • Expensive maintenance costs • Difficulty sourcing R22 If your system still relies on R22, proactive replacement planning can reduce future downtime and emergency repair costs.

07 · CONVERSION

Professional Retrofit Process A typical R22 retrofit follows a structured sequence carried out by qualified HVAC engineers:

01

System Inspection

02

Leak Testing

Full assessment of the existing installation and components.

Identify and resolve any refrigerant leaks before charging.

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R22 REPLACEMENT SOLUTIONS

03

Refrigerant Recovery

04

Oil Compatibility Assessment

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Component Checks

06

Refrigerant Charging

07

Pressure Testing

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Performance Verification

Technical Guide

Safely reclaim existing R22 in line with regulations.

Confirm or replace lubricants to suit the new refrigerant.

Inspect gaskets, seals, expansion valves and filter driers.

Charge the system with the selected R22 alternative.

Verify operating pressures match design specifications.

Commission the system and confirm reliable cooling output.

Professional HVAC engineers should always perform refrigerant conversions to ensure: • Safety • Compliance • Correct charging • Reliable operation 08 · COMPLIANCE

Environmental and Regulatory Compliance Modern refrigerants help businesses align with: • F-Gas regulations • Environmental sustainability targets • Energy efficiency goals • Refrigerant management requirements The Wider Benefit Upgrading from R22 can also help reduce carbon footprint and improve operational efficiency — supporting both environmental and commercial objectives.

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09 · SUMMARY

Conclusion R22 replacement refrigerants provide a practical and cost-effective solution for maintaining older air conditioning and refrigeration systems. With R22 becoming increasingly unavailable and expensive, switching to a compatible alternative helps extend equipment lifespan, reduce maintenance costs, and improve environmental compliance.

Solutions such as RS-70 (R453A), MO99 (R438A), and R407C offer varying benefits depending on system design, budget, and performance requirements. Choosing the correct refrigerant and working with experienced HVAC professionals ensures safe operation and long-term reliability.

Key Takeaway For businesses and property owners still operating R22 systems, proactive retrofit planning is now an essential step toward maintaining efficient and compliant cooling systems for the future.

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