Carrier X-POWER Series - Page 106

R410a DC Inverter 60Hz Carrier service manual
124 Installation
2. Correct operation procedure:
Rotate the pipe evenly and slowly, and apply force to it. Cut the pipe off while ensuring that it does not
deform.
3. Risk if a saw or cutting machine is used to cut pipe:
Copper chip will enter the pipe (in this case, it will be very hard to clean up), or which may even enter the
compressor or blocking the throttling unit.
3.1.3.2 Rectify opening of copper pipe
1. Purpose
Clear out the burr at the opening of the copper pipe, clean the inside of the pipe, and rectify the opening
of the pipe, so as to avoid scratch at the opening to be sealed during flaring.
2. Operation procedure
1) Use a scraper to remove the inner spurs. When doing so, keep the opening of the pipe downwards to
avoid copper chip from entering the pipe.
2) After the chamfering is completed, use veiling to remove the copper chip out of the pipe.
3) Ensure no scar of produced, so as to avoid the pipe from getting broken during flaring.
4) If the pipe end obviously deforms, cut the end off and then cut the pipe again.
3.1.3.3 Pipe expansion
1. Purpose: Expand the opening of the pipe so that another copper pipe can be inserted to replace direct
connection and reduce welding spots.
2. Highlight: Ensure that the connection part is smooth and even; after cutting the pipe off, remove the
inner spurs.
3. Operation method: Insert the expanding header of the pipe expander into the pipe to expand the pipe.
After completing pipe expansion, rotate the copper pipe a small angle to rectify the straight line scratch
left by the expanding header.
3.1.3.4 Opening bell-mouthed opening
1. Purpose: Flaring Bell-mouthed opening is used for screw thread connection.
2. Highlight:
1) Before performing the Bell-mouthed opening operation, perform fire annealing for the hard pipe.
2) Use pipe cutter to cut pipe to ensure even cross section and avoid refrigerant leakage; do not use a
steel saw or metal cutting device to cut pipe, otherwise the cross section will get deformed and the
copper chip will enter the pipe.
3) Remove burr carefully to avoid scar on the bell-mouthed opening, which may lead to refrigerant
leakage.
4) When connecting pipes, use two spanners (one torque wrench and one non-adjustable spanner).
5) Before conducting opening bell-mouthed, install pipe onto the flaring nut.
6) Use proper torque to tighten the flaring nut.