Section 6. Refrigerant Line Routing - Trane 4TWB4018G Installer's Manual

5.5 Reuse Existing Refrigerant Lines
CAUTION
L !
If using existing refrigerant lines make certain that
all joints are brazed, not soldered.
For retrofit applications, where the existing
indoor evaporator coil and/or refrigerant lines
will be used, the following precautions should
be taken:
• Ensure that the indoor evaporator coil and
refrigerant lines are the correct size.
• Ensure that the refrigerant lines are free of
leaks, acid, and oil.
Important: For more information see publi-
cation numbers SS-APG006-EN and APP-
APG011-EN.

Section 6. Refrigerant Line Routing

6.1 Precautions
Important: Take precautions to prevent noise
within the building structure due to vibration
transmission from the refrigerant lines.
For Example:
• When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation type
hangers.
• Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings.
• Where the refrigerant lines run through a wall or sill, they should be insulated and isolated.
• Isolate the lines from all ductwork.
• Minimize the number of 90º turns.
Side View
18-BC77D1-6
8 Feet Maximum
Secure Vapor line from joists using isolators every 8 ft. Secure
Liquid Line directly to Vapor line using tape, wire, or other appro-
priate method every 8 ft.
Isolation From Joist/Rafter
Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.
8 Feet Maximum
Joist/Rafter
Isolator
Line Set
7