ASHRAE Standard 62.1, “Ventilation for Acceptable Indoor Air Quality,” is the gold standard for maintaining indoor air quality in occupied spaces. The standard allows for engineers to demonstrate compliance through multiple pathways, such as natural ventilation and mechanical ventilation. This article focuses on integrating the requirements of 62.1 for mechanical ventilation with variable refrigerant flow (VRF) systems.
VRF systems are direct expansion heat pump systems in which multiple indoor units are connected to a common condensing unit, which can be either air or water source via a refrigerant piping network.