Correct pressure testing is the most important stage in commissioning and maintaining air conditioning, refrigeration, freezer, and chiller systems. Yet on site, engineers are often working from memory, using mixed guidance, or outdated figures when deciding what pressure to test their system at. To make this process quicker, clearer, and more consistent, we’ve developed the Refrigerant Pressure Test Calculator, a simple tool designed for real-world use by engineers.
Pressure testing serves two critical purposes: confirming system integrity by ensuring pipework, joints, valves, and components can safely withstand operating pressures, and preventing leaks by keeping refrigerant contained within the system to protect both performance and the environment. If a leak is missed or an incorrect test pressure is used, the consequences can include refrigerant loss, reduced system efficiency, and costly call-backs or downtime.
Environmental harm, particularly with high-GWP refrigerants:
The calculator is built around the two primary types of pressure testing used in HVAC and refrigeration work, providing a clear and practical reminder of their distinct purposes and applications.
Tightness Test:
This test focuses on leak detection. It is normally carried out at a slightly lower pressure but held for a longer duration (usually 24 hours), allowing engineers to identify pressure drops that indicate a potential refrigerant leak. Both tests are essential, and the correct pressure depends heavily on the refrigerant the system is designed to use.
Strength Test:
This test checks the mechanical strength of the system. It is typically carried out at a higher pressure for a shorter period (usually 10-30 minutes) , confirming that pipework and components can safely withstand stress without deformation or failure. Usually carried out after a gas leak has already accrued.
How the Refrigerant Pressure Test Calculator Works:
The calculator has been designed to be fast and intuitive for use on site.
Step 1 – Select the Refrigerant:
Choose the refrigerant used in the system, such as R410A, R32, R134a, R404A, R290, CO₂ (R744), or others.
Step 2 – Select the Test Type:
Choose either:
Strength Test
Tightness Test
Step 3 – Show Results:
The calculator instantly displays:
Required test pressure in bar, psi, kPa, and MPa
Typical recommended test duration
Environmental reference data for the refrigerant, including GWP (Global Warming Potential) and ODP (Ozone Depletion Potential)
No tables to scroll through, no conversions to calculate manually.
Built With Environmental Responsibility in Mind:
An often-overlooked aspect of pressure testing is its environmental impact. Many commonly used refrigerants have a high Global Warming Potential, meaning even small leaks can have a lasting effect on the environment. By displaying GWP and ODP alongside the required test pressure, the calculator reinforces an important message, correct pressure testing helps prevent refrigerant loss before a system ever goes into service. This serves as a simple reminder that good engineering practice and environmental responsibility go hand in hand. Designed for real engineers rather than over-complicated theory, the calculator is not intended to replace manufacturer instructions or site-specific requirements, but instead provides clear, typical industry guidance as a quick on-site reference. Its design focuses on simple toggle-based inputs, clear outputs in familiar units, minimal technical clutter, and suitability for both mobile and desktop use. While the calculator offers reliable reference values, engineers should always follow manufacturer pressure limits, comply with site-specific risk assessments, use calibrated test equipment, and observe all relevant standards and regulations.
A Practical Tool for Everyday HVAC Work:
Whether you’re commissioning a new VRF system, pressure testing a commercial chiller, or carrying out leak testing on a refrigeration circuit, the Refrigerant Pressure Test Calculator is designed to save time, reduce errors, and promote best practice. It’s a small tool, but one that supports safer systems, better performance, and lower environmental impact.
General Table Of Recommended Pressure Testing Levels By Refrigerant:
| Refrigerant | Safety Class | Typical Application | Tightness Test Pressure | Strength Test Pressure | GWP | Safety Class |
| R22 | A1 | Legacy AC / refrigeration | 25 bar | 32 bar | 1810 | A1 |
| R32 | A2L | Modern AC / heat pumps | 35–38 bar | 42 bar | 675 | A2L |
| R134a | A1 | Chillers, MT refrigeration | 18–20 bar | 23–25 bar | 1430 | A1 |
| R290 (Propane) | A3 | Small chillers, cabinets | 15–18 bar | 20–25 bar | 3 | A3 |
| R404A | A1 | Legacy freezers | 35–38 bar | 40–42 bar | 3922 | A1 |
| R407C | A1 | Comfort cooling | 30–32 bar | 38–40 bar | 1774 | A1 |
| R407F | A1 | R404A retrofit | 35–38 bar | 40–42 bar | 1825 | A1 |
| R410A | A1 | Older AC / chillers | 35–38 bar | 42 bar | 2088 | A1 |
| R448A | A1 | Commercial refrigeration | 35–38 bar | 40–42 bar | 1387 | A1 |
| R449A | A1 | Commercial refrigeration | 35–38 bar | 40–42 bar | 1397 | A1 |
| R600a (Isobutane) | A3 | Domestic / light commercial | 8–10 bar | 12–15 bar | 3 | A3 |
| R717 (Ammonia) | B2L | Industrial refrigeration | 18–22 bar | 25–30 bar | 0 | B2L |
| R744 (CO₂) | A1 | Supermarkets / industrial | 60–80 bar | 90–130 bar | 1 | A1 |
| R1234ze | A2L | Large chillers | 18–22 bar | 25–28 bar | 7 | A2L |
Created 02/01/26 SH