In HVAC, what does PSIG stand for?

PSIG stands for "Pounds per square inch gauge." This term is widely used in HVAC systems to measure pressure relative to atmospheric pressure. The gauge reading indicates how much pressure is being exerted by gases or liquids in a system while accounting for the ambient air pressure.

Using gauge pressure (as indicated by PSIG) is crucial for HVAC applications because it helps technicians understand the operational pressures within the equipment, such as refrigerant pressures in air conditioning systems or the pressures in gas lines. This is essential for diagnosing system performance, ensuring safety, and making adjustments as needed.

Understanding the concept of gauge pressure is important because it allows HVAC professionals to obtain accurate readings that reflect the true operating conditions of the systems they work with, aiding in effective maintenance and troubleshooting. In contrast, other terms like pounds per square inch gravity or pounds per square inch gas are not recognized or utilized in the same way in the context of HVAC, making them less relevant to industry standards.