ASHRAE Terminology

a device that allows the accurate vacuum transfer of small volumes of gaseous refrigerants to the sealed tube (or metal test cell) containing precharged lubricant. This apparatus consists of a manifold (metal or glass), vacuum pump, pressure gage, high vacuum gage, refrigerant cylinder, valves, and filling ports. The function of this apparatus is to evacuate the tube, degas the lubricant, add refrigerant along with the test materials, and seal it. It is calibrated so that the required mass of refrigerant is added very accurately by following the change in pressure on the pressure gage as refrigerant is added to the tube.

portion of a main in which several branches are close together. Also, a single piece in which there are several fluid paths.

parts used to join, adapt, or adjust other parts of the piping (e.g., flange, joint, manifold).

water connection wherein one pipe communicates with several other lateral outlets through a common housing or fitting.