Trane Mini-4-Way Cassette-Indoor Manual de instalación descargar pdf (Pagina 11)

VRF-SVX28A-EN 11

Installation

Installing Refrigerant Piping

Connect field-supplied piping using flared connections (not supplied) or by brazing. The large unit

port is for gas refrigerant; the small one is for liquid refrigerant.

Cut or extend field-supplied piping as needed. Use the following procedures.

• Before connecting the pipes, make sure they are free of dirt and debris.

• Use insulated, unwelded, degreased, and deoxidized copper pipe (Cu-DHP type according to

ISO 1337 or UNI EN 12735-1) suitable for an operating pressure of at least 609.15 psi (4200 kPa)

and a burst pressure of at least 3002.28 psi (20,700 kPa). Copper pipe for hydro-sanitary

applications is unsuitable.

• For sizing and limits (height difference, line length, maximum bends, refrigerant charge, and

so on) see the outdoor unit installation manual.

• All refrigerant connections must be accessible for servicing and maintenance.

Pipe Cutting

Required tools:

•Pipe cutter

•Reamer

• Pipe holder

1. Using a pipe cutter, cut the pipe so that the cut edge is at 90° to the side of the pipe.

2. Use a reamer to remove all burrs at the cut edge.

See examples of correctly and incorrectly cut pipes.

Flared Pipe Connections

Clutch type and wing nut type flare tools are available for flared pipe connections.

1. Slide the flare nut over the pipe to be flared.

2. Slide the end of the pipe into the hole on the flaring bar that fits the pipe, leaving a length of

pipe, determined by tool type (see table), extending above the flaring bar. Clamp it down.

NOTICE

System Failure!

If brazing is used for pipe connections, a nitrogen purge is required to prevent the formation of

copper oxides inside the piping. Failure to follow this procedure could damage the system.

Correct: 90º

Oblique

Rough

Burr

Length of pipe extending above flare bar

Pipe

Flaring

bar

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 39 40

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Trane Mini-4-Way Cassette-Indoor Manual de instalación Pagina 11