The High Pressure Category covers air conditioning and refrigeration systems operating at pressures exceeding 10 pounds per square inch (psi) in the low-side circuit. Most residential and commercial HVAC systems, including those using R-410A and R-22, fall into this category. High-pressure systems represent the majority of stationary cooling equipment in operation today.
System Specifications
High-pressure systems include standard split-system air conditioners, heat pumps, and commercial refrigeration units. These systems operate with higher pressure differentials, reducing contamination risk compared to low-pressure equipment. R-410A systems typically operate at pressures around 100-150 psi on the high side and 50-100 psi on the low side.
Certification and Service
Type I and Type III certifications cover high-pressure equipment servicing. Technicians must be familiar with modern refrigerant properties, pressure-temperature relationships, and recovery procedures. Most residential HVAC work involves high-pressure systems, requiring technicians to maintain proper evacuation standards and prevent system contamination during maintenance and repair activities.