Trane Performance Climate Changer UCCA Series Installation, Operation And Maintenance Manual page 49

Figure 53. Dual-circuit condensing unit: evaporator coil with two distributors
Suction line
with Horizontal-Split (Standard) Circuiting
(circuit 2)
Suction line
(circuit 1)
1. Pitch the liquid lines slightly – 1 in./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 in./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 in./10 feet – so that the
refrigerant drains toward the evaporator.
7. Insulate the suction lines.
CLCH-SVX009L-EN
Evaporator Coil
Sight
glass
Solenoid
Distributor
valve
Thermal
expansion
valve (TXV)
Liquid line
(circuit 2)
Liquid line
(circuit 1)
Filter drier
Coil Piping and Connections
49