Trane Odyssey TTA0724 A Series, Application Manual

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20 SS-APG008H-EN
Figure 11. Indoor coil (non-TWE) with one distributor (single-circuit TTA/TWA units)
Notes:
1. Pitch the liquid line 1 inch per 10 feet (1 cm per 3 m) so that the liquid refrigerant drains toward the indoor coil. Use
the liquid-line size recommended in Table 2, p. 25 or Table 3, p. 26 .
2. Provide one expansion valve (TXV) per distributor.
TWA heat pumps only : Provide one check valve for each expansion valve.
3. Pitch the gas line leaving the coil so that it slopes away from the coil by 1 inch per 10 feet (1 cm per 3 m).
4. Use the DETINT to prevent oil and refrigerant migration when the unit is off. The DETINT also serves to isolate the
TXV bulb from suction-header conditions. See “Line Sizing, Routing, and Component Selection,” p. 9 .
5. Use the “horizontal” tube diameter identified in the Component selection tables, found in “Parts,” p. 25 .
6. For vertical risers, use the tube diameter recommended in Table 2, p. 25 or Table 3, p. 26 . Ensure that the top of the
riser is at least 1 foot (30 cm) above the lowest point.
7. Pitch the gas line 1 inch per 10 feet (1 cm per 3 m) toward the indoor coil.
8. Insulate the gas line.
Refrigerant Piping Examples