UL 207-2020 pdf free download.Refrigerant-Containing Components and Accessories, Nonelectrical.
3A.12 CRITICAL PRESSURE, CRITICAL TEMPERATURE AND CRITICAL VOLUME — Terms given to the state points of a substance at which liquid and vapor have identical properties. Above the critical pressure or critical temperature there is no line of demarcation between liquid and gaseous phases.
3A.13 DESICCANT — Any adsorbent that removes water or water vapor from the refrigerant.
3A.14 DESIGN PRESSURE — The maximum allowable working pressure for which a specific part of a system is designed.
3A.15 DOUBLE WALL CONSTRUCTION — A refrigerant containing component, such as a heat exchanger having two distinct thicknesses of material separating the fluid on one side of the component from the heat transfer fluid on the other side of the component. A component of this type incorporates either a vented interface or redundant construction to prevent the leakage from one fluid into the other. For the purposes of this definition, the terni fluid” is meant to encompass both liquids and gases.
3A.16 DRIER — A device containing a desiccant placed in the refrigerant drcuit, its primary purpose being to collect and hold within the desiccant all water in the system in excess of the amount which can be tolerated in the circulating refrigerant.
3A.17 EVAPORATOR — That part of the system designed to vaporize liquid refrigerant to produce refrigeration.
3A.18 EVAPORATOR COIL — An evaporator constructed of pipe or tubing other than a shell-and-tube or shell-and-coil type.
3A.19 FILTER — A device intended to remove solid material from a fluid.
3A.20 FIN — An extended surface, such as metal sheets attached to tubes, intended to increase the heat transfer area.
3A.21 FUSIBLE ELEMENT — A metal with a relatively low melting point located within the relief opening of a fusible plug. The metal is intended to melt and flow away allowing the release of pressure if a predetermined temperature is reached.
3A.22 FUSIBLE PLUG — A device having a predetermined-temperature fusible element for the relief of pressure.
3A.23 HEAT EXCHANGER (INTERCHANGER) — A device specifically designed to transfer heat between refrigerant in the high side and low side of the system.
3A.24 HIGH SIDE — The parts of a refrigerating system subjected to condenser pressure.
3A.25 JOINT, BRAZED — A gastight joint obtained by the joining of metal parts with alloys which melt at temperatures higher than 800°F (427°C) but less than the melting temperatures of the joined parts.
3A.26 JOINT, MECHANICAL — A gastight joint obtained by the joining of meta’ parts through a positive holding mechanical construction.
3A.27 JOINT, SOLDERED — A gastight jolnt obtained by the joining of metal parts with metallic mixtures or alloys which melt at temperatures not exceeding 800°F (427°C) and above 400°F (204°C).
3A.28 JOINT, WELDED — A gastight joint obtained by the joining of metal parts in the plastic or molten state.UL 207 pdf download.