UL-207:2014 pdf free download – STANDARD FOR SAFETY Refrigerant-Containing Components and Accessories, Nonelectrical.
3.3.9 VALVE, STOP — A device intended to shut off the flow of refrigerant.
3.4 Terminology
3.4.0 CAPILLARY TUBE — Device made of tubing with an outer diameter less than 3/16 in. (4.7 mm) and used to reduce the pressure of the refrigerant between the condenser and evaporator. It also regulates the refrigerant flow.
3.4.0 added July 12, 2013
3.4.1 CASCADE SYSTEM — A refrigeration system that incorporates two or more independent vapor- compressor refrigeration cycles in series. This is done to acquire low temperatures that may not be readily achieved with a single refrigeration cycle.
3.4.2 CONDENSER — That part of the system designed to liquefy refrigerant vapor by removal of heat.
3.4.3 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.
3.4.4 DESICCANT — Any adsorbent that removes water or water vapor from the refrigerant.
3.4.5 DESIGN PRESSURE — The maximum allowable working pressure for which a specific part of a system is designed.
3.4.5.1 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 term “fluid” is meant to encompass both liquids and gases.
3.4.5.1 added July 12, 2013
3.4.6 EVAPORATOR — That part of the system designed to vaporize liquid refrigerant to produce refrigeration.
3.4.7 FIN — An extended surface, such as metal sheets attached to tubes, intended to increase the heat transfer area.
3.4.7.1 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 pre-determined temperature is reached.
3.4.7.1 added July 12, 2013
3.4.8 HIGH SIDE — The parts of a refrigerating system subjected to condenser pressure.
3.4.9 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.
3.4.10 JOINT, MECHANICAL — A gastight joint obtained by the joining of metal parts through a positive holding mechanical construction.
3.4.11 JOINT, SOLDERED — A gastight joint 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).
3.4.12 JOINT, WELDED — A gastight joint obtained by the joining of metal parts in the plastic or molten state.
3.4.13 LIMITED-CHARGE SYSTEM — A system in which, with the compressor idle, the internal volume and total refrigerant charge are such that the design pressure will not be exceeded by complete evaporation of the refrigerant charge.
3.4.14 LOW SIDE — The parts of a refrigerating system subjected to evaporator pressure.
3.4.15 MANIFOLD — That portion of the refrigeration circuit in which several branches are close together. Also, a single piece in which there are several fluid paths.