The Very High Pressure Category includes systems operating at pressures exceeding 200 pounds per square inch (psi) in the low-side circuit during normal operation. These specialized systems are relatively uncommon and typically involve commercial refrigeration applications using specific refrigerant types. Very high-pressure equipment requires advanced technical expertise and specialized recovery equipment.
System Applications
Very high-pressure systems include certain industrial refrigeration installations and specialized commercial cooling equipment. These systems demand precise pressure control and monitoring to operate safely. Only a small percentage of stationary HVAC equipment falls into this category, as most commercial systems operate at standard high or low pressures.
Technical Requirements
Technicians servicing very high-pressure equipment must understand complex pressure-temperature charts and system dynamics. Specialized recovery and recycling equipment rated for higher pressures is essential. These systems require strict adherence to EPA regulations and comprehensive documentation of all service activities, including pressure readings and refrigerant quantities recovered and disposed.