Trane BCHC Application Manual page 19

Figure 7. Indoor coil with two distributors (dual TTA/TWA units)
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 3, p.
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
For vertical risers, use the tube diameter
recommended in Table 3, p.
top of the riser is at least 1 foot (30 cm) above
the lowest point.
5
Pitch the gas line 1 inch per 10 feet (1 cm per
3 m) toward the indoor coil.
6
Insulate the gas line.
SS-APG010C-EN
16.
16. Ensure that the
Refrigerant Piping Examples
unit 2
unit 1
13