Trane Performance Air Handlers Manual de Instalação descarregar pdf (Página 67)

CAH-SVX01B-EN 67

Coil Piping and Connections

Dual-Circuit Condensing Unit: Evaporator Coil with Four Distributors

Figure 64. Dual-circuit evaporator coil with four distributors 1. Pitch the liquid line slightly—1 inch/10 feet

[1 cm/3 m]—so the refrigerant drains

toward the evaporator. See Figure 64.

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. 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.

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Trane Performance Air Handlers Manual de Instalação Página 67