Trane Performance Climate Changer UCCA Series Installation, Operation And Maintenance Manual page 50

Coil Piping and Connections
Figure 54. Dual-circuit condensing unit: evaporator coil with four distributors
with Horizontal-Split (Standard) Circuiting
Suction line
(circuit 2)
Suction line
(circuit 1)
Evaporator Coil with Intertwined Circuiting
Suction lines
50
Evaporator Coil
Thermal expansion
valves (TXV)
Solenoid
valve
Sight
glass
Distributor
Thermal expansion
valves (TXV)
Sight
glass
Distributor
1. Pitch the liquid line slightly – 1 in./10 feet – so that
the refrigerant drains toward the evaporator.
2. Provide one expansion valve per distributor.
Liquid line
(circuit 2)
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. This looks like a drain trap, but is actually due to the
Liquid line
(circuit 1) requirement that the refrigerant gas leaving the coil
flows downward, past the lowest suction-header
outlet, before turning upward. Use the double-elbow
configuration to isolate the TXV bulb from other
Filter drier
suction headers.
5. Use the "horizontal" tube diameter as specified in
the condensing unit application manual.
6. Use the tube diameter recommended for a vertical
rise as specified in the condensing unit application
Liquid line
manual. Ensure that the top of the riser is higher
(circuit 2)
than the evaporator coil.
7. Pitch the suction line slightly – 1 in./10 feet – so that
the refrigerant drains toward the evaporator.
Solenoid
8. Insulate the suction line.
valve
9. The top of the Circuit 1 suction riser must be higher
than the bottom evaporator coil. Use the tube
Liquid line
diameter recommended for a vertical rise as
(circuit 1)
specified in the condensing unit application manual.
10. The top of the Circuit 2 suction riser must be higher
Filter drier
than the top evaporator coil. Use the tube diameter
recommended for a vertical rise as specified in the
condensing unit application manual.
CLCH-SVX009L-EN