Trane Climate Changer T Series Installation Operation & Maintenance page 62

Installation - Piping
Single-Circuit Condensing Unit: Evaporator Coil with Two Distributors
Figure 47. Single-circuit evaporator coil with two
distributors
Suction line
7, 8
6
5
4
7, 8
3
6
5
3
4
62
Evaporator coil
with horizontal-split
(standard) circuiting
'Trim'
solenoid valve
Liquid
S
9
Sight
Thermal
glass
1
expansion
valve (TXV)
S
9
'Pump-down'
solenoid valve
Distributor
Evaporator coil with
intertwined circuiting
Liquid
2
Sight
glass
S
1
2
Solenoid
valve
Thermal
expansion
valve (TXV)
Distributor
1. Pitch the liquid line slightly—1 inch/10 feet
[1 cm/3 m]—so 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—that is, 1 inch/
line
10 feet [1 cm/3 m] in the direction of flow. Use
the tube diameter that matches the suction-
header connection.
4. Arrange the suction line so the refrigerant gas
Filter drier
leaving the coil flows downward, past the
lowest suction-header outlet, before turning
upward. Use a double-elbow configuration to
isolate the thermal expansion valve bulb from
other suction headers.
5. For horizontal tubing, use the tube diameter
recommended by the condensing unit
line
manufacturer.
6. For the vertical riser, use the tube diameter
recommended by the condensing unit
manufacturer. Assure the top of the riser is
Filter drier
higher than the evaporator coil.
7. Pitch the suction line slightly—1 inch/10 feet
[1 cm/3 m]—so the refrigerant drains toward
the evaporator.
8. Insulate the suction line.
9. Only use a "trim" solenoid valve for constant-
volume, humidity-sensitive applications. For all
other applications, install a single solenoid
valve (the "pumpdown" solenoid valve)
between the liquid-line filter drier and the sight
glass.
T-Series Climate Changer Air Handler IOM • CLCH-SVX06A-EN