Trane Performance Air Handlers Manual de instalación descargar pdf (Pagina 62)

62 CAH-SVX01B-EN

Coil Piping and Connections

NOTICE

Valve Damage!

Disassemble the thermal expansion valve before completing the brazing connections. If

necessary, wrap the valve in a cool, wet cloth while brazing. Failure to protect the valve from

high temperatures may result in damage to internal components.

Suction Lines

Line sizing. Proper suction-line sizing is required to guarantee the oil returns to the compressor

throughout the system’s operating envelope. At the same time, the line must be sized so that the

pressure drop does not excessively affect capacity or efficiency. To accomplish both objectives, it

may be necessary to use two different line diameters: one for the horizontal run and for vertical

drops, and another for the vertical lifts.

Routing. To prevent residual or condensed refrigerant from “free-flowing” toward the compressor,

install the suction line so it slopes slightly—that is, by ¼ inch to 1 inch per 10 feet of run—toward

the evaporator. When the application includes a suction riser, oil must be forced to travel the height

of the riser. Riser traps and double risers are unnecessary in the suction line when the refrigerant

coil is used with Trane condensing units.

Avoid putting refrigerant lines underground. Refrigerant condensation or installation debris inside

the line, service access, and abrasion/corrosion can quickly impair reliability.

-Insulation. Any heat that transfers from the surrounding air to the cooler suction lines increases

the load on the condenser (reducing the system’s air-conditioning capacity) and promotes

condensate formation (adversely affecting indoor air quality). After operating the system and

testing all fittings and joints to verify the system is leak-free, insulate the suction lines all the way

to inner side panel to prevent heat gain and unwanted condensation.

Components. Installing the suction line requires field installation of these components: a filter,

access port, and a Frostat™ control when the refrigerant coil is used with Trane condensing units.

Position them as close to the compressor as possible.

Note: Placement of the Frostat control is illustrated in Figure 58 on page 60.

• Filter. The suction filter prevents contaminants, introduced during installation, from entering

the compressor. For this reason, the suction filter should be the replaceable-core type, and a

clean core should be installed after the system is cleaned up.

• Access port. The access port is used to determine suction pressure. This port is usually a

Schraeder valve with a core.

• Frostat™ coil frost protection. The Frostat control is the preferred method for protecting

evaporator coils from freezing when the refrigerant coil is used with Trane condensing units.

It senses the suction-line temperature and temporarily disables mechanical cooling if it detects

frost conditions. The control is mechanically attached to the outside of the refrigerant line, near

the evaporator, and wired to the unit control panel.

• Ball shutoff valve. Adding manual, ball-type shutoff valves upstream and downstream of the

filter simplifies replacement of the filter core.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 99 100

Sin comentarios

Trane Performance Air Handlers Manual de instalación Pagina 62