Daikin R22, Refrigerant Piping Design Manual, Page: 6 / 78

AG 31-011 • REFRIGERANT PIPING DESIGN 6 www.DaikinApplied.com
Typical Refrigerant Piping Layouts
This section shows several typical refrigerant piping layouts for
commercial air conditioning. They will be used throughout this
guide to illustrate piping design requirements.
Figure 2 shows a condensing unit mounted on grade connected
to a DX coilinstalled in a roof-mounted air-handling unit.
1. A liquid line supplies liquid refrigerant from the condenser
to a thermal expansion (TX) valve adjacent to the coil.
2. A suction line provides refrigerant gas tothe suction
connection of the compressor.
Figure 2: Condensing Unit with DX Air Handling Unit
DX
Air Handling
Unit
TX
Valve
Sight
Glass
Solenoid
Valve
Filter-
Drier
Liquid
Line
Suction
Line
Air Cooled
Condensing
Unit
Suction riser
inverted trap
not required
with pumpdown