Trane AM4A0A30S21SA Series User Manual

90 CLCH-SVX07C-EN
Coil Piping and Connections
Single-Circuit Condensing Unit: Evaporator Coil with Two Distributors
Figure 79. Single-circuit evaporator coil with two distributors 1. Pitch the liquid line slightly—1 inch/10 feet
—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/10 feet in the direction of flow. Use
the tube diameter that matches the suction-
header connection.
4. Arrange the suction line so the refrigerant
gas 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
manufacturer.
6. For the vertical riser, use the tube diameter
recommended by the condensing unit
manufacturer. Assure the top of the riser is
higher than the evaporator coil.
7. Pitch the suction line slightly—1 inch/10 feet
—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.
Suction line
7, 8
Liquid
line
Evaporator coil
with horizontal-split
(standard) circuiting
Evaporator coil with
intertwined circuiting
Liquid
line
‘Trim’
solenoid valve
‘Pump-down’
solenoid valve
Sight
glass
1
Filter drier
Filter drier
Solenoid
valve
Thermal
expansion
valve (TXV)
9
2
2
1
9
7, 8
3
4
4
5
5
6
6
3
3
Distributor
Thermal
expansion
valve (TXV)
Sight
glass
Distributor
S
S
S

Trane AM4A0A30S21SA Series Specifications

General

Brand	Trane
Model	AM4A0A30S21SA Series
Category	Air Handlers
Language	English