Trane Performance Air Handlers Manual de instalación descargar pdf (Pagina 68)

100

68 CAH-SVX01B-EN

Coil Piping and Connections

Dual-Circuit Condensing Unit: Evaporator Coil with Eight Distributors

Figure 65. Dual-circuit evaporator coil with eight distributors

1. Pitch the liquid line slightly—1 inch/10 feet

[1 cm/3 m]—so the refrigerant drains

toward the evaporator. See Figure 65.

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 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. Ensure 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. 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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