Trane UCCA Installation, Operation And Maintenance Manual page 41

Figure 37. Dual-circuit condensing unit: evaporator coil with two distributors
suction line
(circuit 2)
suction line
(circuit 1)
1. Pitch the liquid lines slightly—1 inch/10 feet —so that
the refrigerant drains toward the evaporator.
2. Provide one expansion valve per distributor.
3. Slightly pitch the outlet line from the suction header
toward the suction riser—1 inch/10 feet in the direction
of flow. Use the tube diameter that matches the
suction-header connection.
4. The top of the Circuit 1 suction riser must be higher
than the bottom evaporator coil. Use the tube diameter
recommended for a vertical rise as specified in the
condensing unit application manual.
5. The top of the Circuit 2 suction riser must be higher
than the top evaporator coil. Use the tube diameter
recommended for a vertical rise as specified in the
condensing unit application manual.
6. Pitch the suction lines slightly—1 inch/10 feet —so that
the refrigerant drains toward the evaporator.
7. Insulate the suction lines.
CLCH-SVX009A-EN
sight
glass
distributor
thermal
expansion
valve (TXV)
Coil Piping and Connections
with Horizontal-Split
(Standard) Circuiting
liquid line
(circuit 2)
solenoid
valve
liquid line
(circuit 1)
filter drier
Evaporator Coil
41