Refrigerant Piping - LG ARNU073TUC4 Instruction Manual

Multi v ceiling cassette indoor unit

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Table Of Contents

Table of Contents

Piping Preparation

Do not braze in an enclosed location. Do not allow the refrigerant to leak during brazing. Always test

for gas leaks before / after brazing.

If the refrigerant combusts, it generates a toxic gas.

1. Do not use kinked pipe caused by excessive bending in one specific area on its length.

2. Braze the pipes to the service valve pipe stub of the outdoor unit.

3. After brazing, check for refrigerant gas leaks.

4. When selecting flare fittings, always use a 45° fitting rated for use with high pressure refrigerant R410A. Selected fittings must also

comply with local, state, or federal standards.

Creating a Flare Fitting

One of the main causes of refrigerant leaks is defective flared

connections. Create flared connections using the procedure below.

1. Cut the pipe to length.

• Measure the distance between the indoor unit and the outdoor unit.

• Cut the pipes a little longer than measured distance.

2A. Remove the burrs.

• Completely remove all burrs from pipe ends.

• When removing burrs, point the end of the copper pipe down to

avoid introducing foreign materials in the pipe.

2B. Slide the flare nut onto the copper tube.

3. Flaring the pipe end.

• Use the proper size flaring tool to finish flared connections as

shown.

• ALWAYS create a 45° flare when working with R410A.

4. Carefully inspect the flared pipe end.

• Compare the geometry with the figure to the right

• If the flare is defective, cut it off and re-do procedure.

• If flare looks good, blow clean the pipe with dry nitrogen.

Dimensions of the Flare.

90°

"A"

R=0.4 – 0.8

Flared Connection Dimensions.

≤19,100

<54,600

≤76,400

Due to our policy of continuous product innovation, some specifications may change without notification.