Trane Performance Air Handlers Instrukcja Instalacji Pobierz pdf (Strona 64)

100

64 CAH-SVX01B-EN

Coil Piping and Connections

Single-Circuit Condensing Unit: Evaporator Coil with Two Distributors

Figure 61. 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. See Figure 61.

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. 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.

Suction line

7, 8

Liquid

line

Evaporator coil

with horizontal-split

(standard) circuiting

Evaporator coil with

intertwined circuiting

Liquid

line

‘Trim’

solenoid valve

‘Pump-down’

solenoid valve

Sight

glass

Filter drier

Solenoid

valve

Thermal

expansion

valve (TXV)

7, 8

Distributor

Thermal

expansion

valve (TXV)

Sight

glass

Distributor

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 99 100

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