62
CLCH-SVX03C-EN
Coil Piping and Connections
Single-Circuit Condensing Unit: Evaporator Coil with Four Distributors
Figure 58. Single-circuit evaporator coil with two distributors
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/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 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
[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 “pump-
down” solenoid valve) between the liquid-
line filter drier and the sight glass.