92 CLCH-SVX07C-EN
Coil Piping and Connections
Dual-Circuit Condensing Unit: Evaporator Coil with Two Distributors)
Figure 81. Dual-circuit evaporator coil with two distributors
1. Pitch the liquid lines 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. 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.
5. Arrange the suction line so the refrigerant gas leaving the coil flows downward, past the lowest
suction-header outlet, before turning upward.
6. 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.
7. Pitch the suction lines slightly—1 inch/10 feet —so the refrigerant drains toward the evaporator.
8. Insulate the suction lines.
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