Test Operation
SiENBE28-901
62
Air Cooled Refrigeration Condensing Unit
5.1.5 Precautions for Piping
Perform piping branching with the following conditions kept in mind.
At the time of branching the liquid piping, use a T-joint or Y-joint and branch it horizontally.
This will prevent an uneven flow of refrigerant.
At the time of branching gas piping, use a T-joint and branch it so that the branched piping
will be located above the main piping (see the illustration below). This will prevent the stay of
refrigerant oil in the indoor unit not in operation.
Use a Y-joint for the liquid refrigerant branch and have the piping branch horizontally.
Use a T-joint for the gas refrigerant branch and connect from the top of the main piping.
Make sure that the horizontal portion of the gas piping slants downward to the outdoor unit
(see the illustration above).
If the outdoor unit is located above, make a trap on the gas pipe at 5 m intervals from
outdoor unit. This will ensure the smooth returning of oil in the piping slanting upward.
Y-joint
A
Horizontal
surface
±30° or less
A-arrow view
T-joint
Main piping
Indoor unit side
Branch piping
T-joint
Make the piping
slant downward
Branch piping
Make the piping
slant downward
Main piping
Make the piping
slant downward
Outdoor unit side
