Welcome to our comprehensive guide on navigating the complexities of the Refrigerant Temperature Pressure Chart. This essential tool is invaluable for HVAC professionals and technicians, as it enables accurate estimation of condensing and evaporation temperatures that are crucial for effective system management. Whether you are a seasoned expert or new to the field, this article will provide you with the knowledge to understand and apply pressure-temperature relationships for various refrigerants including R22, R410A, R32, and R404A. Prepare to enhance your skills and confidence in handling refrigeration systems.


Refrigerant Temperature Pressure Chart



Understanding Condensing and Evaporation Temperatures

Condensing Temperature is calculated as the ambient (air or water) temperature plus an additional 8 to 18 degrees Celsius.
Evaporation Temperature is derived by subtracting 10 to 20 degrees Celsius from the operating (air or water) temperature.


Practical Example: Assessing Refrigerant Levels

Determining whether a refrigeration system is low on refrigerant can often seem daunting to those new to the field. Consider a scenario where the outdoor temperature is around 35°C, and the indoor set temperature is 27°C.


Using the formulas provided:

Condensing Temperature = 35°C + 10°C = 45°C
Evaporation Temperature = 27°C – 20°C = 7°C

These calculations serve as rough estimates. To ascertain the operational pressures of the compressor:


For R22 refrigerant:

High pressure is approximately 1.75 MPa.
Low pressure is approximately 0.6 MPa.
If the observed low pressure is below 0.6 MPa, it may indicate a refrigerant deficiency.

Comprehensive Refrigerant Pressure-Temperature Chart



R22 Pressure-Temperature Chart



R410A Pressure-Temperature Chart


R32 Pressure-Temperature Chart

R404A Pressure-Temperature Chart



Enclosed are detailed charts for refrigerants R22, R23, R404A, and R410A, providing critical temperature and pressure data essential for effective refrigeration system management.


Understanding and utilizing the Refrigerant Temperature Pressure Chart is critical for the efficient operation and maintenance of refrigeration systems. By mastering how to estimate the condensing and evaporation temperatures based on ambient conditions, you can ensure your systems operate optimally, reducing downtime and maintenance costs. This guide not only aids in quick diagnostics but also helps in preventing common issues such as refrigerant undercharging. Always refer to the detailed charts provided for accurate data and continue to consult updated resources to keep your knowledge current. Embrace these tools to excel in your HVAC endeavors, ensuring reliability and efficiency in your daily operations.


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