94 CLCH-SVX07C-EN
Coil Piping and Connections
Dual-Circuit Condensing Unit: Evaporator Coil with Eight Distributors
Figure 83. Dual-circuit evaporator coil with eight 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 TXV 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. The top of the Circuit 1 suction riser must
be higher than the bottom evaporator coil.
Use the tube diameter recommended by
the condensing unit manufacturer for the
riser.
10. The top of the Circuit 2 suction riser must
be higher than the top evaporator coil. Use
the tube diameter recommended by the
condensing unit manufacturer for the
riser.
11. 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.
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